JP6316488B1 - Fluid discharge device - Google Patents

Abstract

A fluid discharge device capable of high-speed operation of opening and closing of a discharge port is provided. A fluid discharge device includes a permanent magnet fixed to a needle for opening and closing a discharge port, and a pair of electromagnets between the permanent magnet. The permanent magnet 16 is configured such that an N pole and an S pole appear in a radial direction that is a direction perpendicular to the needle axis L1. The electromagnets 20 and 21 include a magnetic core, an electromagnetic coil wound around the magnetic core, and a member that transmits each of the magnetic poles generated on both sides of the magnetic core to the magnetic pole surface facing the permanent magnet 16. When opening the discharge port 3 a, the energization control unit 61 applies a repulsive force between the upper electromagnet 20 and the permanent magnet 16, and an attractive force acts between the lower electromagnet 21 and the permanent magnet 16. Thus, the energization direction of the electromagnetic coil is controlled. When closing the discharge port 3a, the energization control unit 61 switches the energization direction of the electromagnetic coil in reverse from the energization direction when opening the discharge port 3a. [Selection] Figure 1

Description

  The present invention relates to a fluid ejection device that ejects a fluid such as a hot melt adhesive.

  2. Description of the Related Art Conventionally, there has been a proposal for a fluid ejection device in which a needle for opening and closing a fluid ejection port is moved by the interaction of a magnetic field generated by a permanent magnet and an electromagnet (see Patent Document 1). In the configuration of Patent Document 1, the permanent magnet connected to the needle (plunger) and the electromagnetic coil mechanism (electromagnet) having a pole portion facing the permanent magnet, and when opening the discharge port, A repulsive force is applied between the permanent magnet and the pole portion of the electromagnetic coil mechanism, and an attractive force is applied between the permanent magnet and the pole portion of the electromagnetic coil mechanism when closing the discharge port.

Japanese Patent Laid-Open No. 7-185427

  By the way, depending on the use of the fluid ejection device, it is necessary to operate the opening and closing of the ejection port at high speed. However, the conventional configuration such as Patent Document 1 has a problem that high speed operation is difficult. That is, in the configuration of Patent Document 1, since only one of the magnetic poles appearing on the electromagnet faces the permanent magnet, the magnetic pole appearing on the non-facing side is not utilized as the driving force of the needle. Further, when the discharge port is opened and closed using an electromagnet, the electromagnet generates heat when the electromagnet is energized. If this calorific value is large, the function of the electromagnet may be impaired.

  This invention is made | formed in view of this problem, and makes it the 1st subject to provide the fluid discharge apparatus which can perform high-speed operation | movement of opening and closing of a discharge outlet. Another object of the present invention is to provide a fluid ejection device capable of reducing the heat generated by an electromagnet in a fluid ejection device that opens and closes an ejection port with an electromagnet.

In order to solve the above problem, a fluid ejection device according to a first aspect of the invention
A housing in which a fluid discharge port is formed;
An opening / closing portion that opens and closes the discharge port, and a movable portion provided in the housing such that the opening / closing portion reciprocates in a direction of opening and closing the discharge port;
A permanent magnet connected to the movable part;
A pair of electromagnets spaced from the permanent magnet with the permanent magnet in between in the moving direction of the movable part; and
A controller for controlling energization of the electromagnet,
Of the pair of electromagnets, the one that approaches the permanent magnet when the movable part moves in the direction to open the discharge port is the first electromagnet, and the one that moves away from the permanent magnet is the second electromagnet.
When the control unit opens the discharge port, an attractive force acts between the first electromagnet and the permanent magnet, and a repulsive force acts between the second electromagnet and the permanent magnet. The energization direction of the first electromagnet and the second electromagnet is controlled, and when the discharge port is closed, a repulsive force acts between the first electromagnet and the permanent magnet, and the second electromagnet and the The energizing direction of the first electromagnet and the second electromagnet is controlled so that an attractive force acts between the permanent magnet and the permanent magnet.

  According to the first invention, a permanent magnet and a pair of electromagnets sandwiched between the permanent magnets, a force acting between the permanent magnet and one electromagnet, and between the permanent magnet and the other electromagnet are provided. Since the movable part is moved using both of the forces acting on the discharge port, it is possible to perform the opening / closing operation of the discharge port at a higher speed than when only one electromagnet is provided. Further, in the first invention, since the movable part is moved using the permanent magnet, it is possible to react quickly with respect to the magnetic field generated by the electromagnet as compared with the case where the magnetic body that is not the permanent magnet is used, As a result, the movable part can be operated at high speed.

The fluid ejection device of the second invention is
A housing in which a fluid discharge port is formed;
An opening / closing portion that opens and closes the discharge port, and a movable portion provided in the housing such that the opening / closing portion reciprocates in a direction of opening and closing the discharge port;
A permanent magnet connected to the movable part;
An electromagnet provided to face the permanent magnet in the moving direction of the movable part;
A controller for controlling energization of the electromagnet so as to generate a force for moving the movable part in a direction in which the discharge port opens or closes between the permanent magnet and the electromagnet;
The permanent magnet includes a first magnetic pole portion and a second magnetic pole portion, which are opposite to each other, on a surface facing the electromagnet,
The electromagnet
An electromagnetic coil;
A first transmission unit configured to transmit a magnetic flux generated on one end side of the electromagnetic coil to a position facing the first magnetic pole unit to form a magnetic pole;
And a second transmission part configured to transmit a magnetic flux generated on the other end side of the electromagnetic coil to a position facing the second magnetic pole part to form a magnetic pole.

  According to the second invention, the force acting between the magnetic pole surface of the first transmission portion of the electromagnet and the first magnetic pole portion of the permanent magnet, the magnetic pole surface of the second transmission portion of the electromagnet, and the second magnetic pole portion of the permanent magnet. The movable part can be moved using both of the forces acting between the two. That is, the magnetic flux generated on both ends of the electromagnetic coil of the electromagnet can be contributed to the force for moving the movable part. In other words, the energy used for energization of the electromagnetic coil can be effectively exhibited. Thereby, compared with the structure which moves a movable part only with the magnetic flux which generate | occur | produced on the one side of an electromagnetic coil, the propulsive force of a movable part can be earned and by extension, the high-speed operation | movement of opening and closing of a discharge outlet is attained. Furthermore, since the movable part is moved using a permanent magnet as in the first aspect of the invention, the movable part reacts more quickly to the magnetic field generated by the electromagnet than when a magnetic material that is not a permanent magnet is used. Can be made.

The fluid ejection device of the third invention is
A housing in which a fluid discharge port is formed;
An opening / closing portion that opens and closes the discharge port, and a movable portion provided in the housing such that the opening / closing portion reciprocates in a direction of opening and closing the discharge port;
A permanent magnet connected to the movable part;
An electromagnet provided to face the permanent magnet in the moving direction of the movable part;
A controller for controlling energization of the electromagnet so as to generate a force for moving the movable part in a direction in which the discharge port opens or closes between the permanent magnet and the electromagnet;
The electromagnet includes a magnetic core divided into a plurality of parts and an electromagnetic coil provided for each of the magnetic cores in a region facing one surface of the permanent magnet.

  According to the third invention, since the magnetic core of the electromagnet and the electromagnetic coil provided thereon are divided into a plurality of parts, the heat storage action of the electromagnetic coil is achieved by the gap formed between the plurality of divided magnetic cores and the electromagnetic coil. This can reduce the heat dissipation area. Thereby, the heat_generation | fever of an electromagnetic coil can be suppressed.

A fluid ejection device according to a fourth invention is
A housing in which a fluid discharge port is formed;
An opening / closing portion that opens and closes the discharge port, and a movable portion provided in the housing such that the opening / closing portion reciprocates in a direction of opening and closing the discharge port;
A permanent magnet connected to the movable part;
An electromagnet provided to face the permanent magnet in the moving direction of the movable part;
A controller for controlling energization of the electromagnet,
Among the permanent magnet and the electromagnet, a plurality of one magnet is provided so as to sandwich the other magnet in between,
Of the one magnet, when the movable part moves in the direction to open the discharge port, the one that approaches the other magnet is the first magnet, and the one that is away from the other magnet is the second magnet.
The controller is configured to apply an attractive force between the first magnet and the other magnet and open a repulsive force between the second magnet and the other magnet when opening the discharge port. The energization direction of the electromagnet is controlled to act, and when the discharge port is closed, a repulsive force acts between the first magnet and the other magnet, and the second magnet and the other magnet The direction of energization of the electromagnet is controlled so that an attractive force acts between them.

  According to the fourth invention, the movable portion is moved using both the force acting between the first magnet and the other magnet and the force acting between the second magnet and the other magnet. Therefore, high-speed operation for opening and closing the discharge port is possible.

It is sectional drawing of the fluid discharge apparatus of 1st Embodiment. It is the perspective view of the permanent magnet in 1st, 2nd, 4th embodiment, Comprising: It is the figure which showed the magnetic pole of the permanent magnet. It is sectional drawing of the electromagnet of 1st Embodiment. In 1st Embodiment, it is the figure which looked at the state which six magnetic cores combined from the surface direction orthogonal to a needle axis line. It is the figure which looked at the magnetic core of 1st Embodiment from the surface direction orthogonal to a needle axis. It is the figure which looked at the magnetic core of 1st Embodiment from the A arrow direction of FIG. It is the figure which looked at the magnetic core of 1st Embodiment from the B arrow direction of FIG. It is the figure which looked at the magnetic core of 1st Embodiment from the C arrow direction of FIG. In 1st Embodiment, it is the figure which looked at the state by which the electromagnetic coil was wound around one magnetic core from the surface direction orthogonal to a needle axis. In 1st Embodiment, it is the figure which looked at the state by which the electromagnetic coil was wound around one magnetic core from the surface direction parallel to a needle axis line and parallel to the central axis line of a magnetic core. In 1st Embodiment, it is the figure which looked at the state by which the electromagnetic coil was wound around six magnetic cores and each magnetic core from the surface direction orthogonal to a needle axis line. It is a side view (figure seen from the surface direction parallel to a needle axis) of the outer magnetic pole part of a 1st embodiment. It is the figure which looked at the outer magnetic pole part of 1st Embodiment from the D arrow direction (the side opposite to the side where a permanent magnet is arrange | positioned) of FIG. It is the figure which looked at the outer magnetic pole part of 1st Embodiment from the E arrow direction (side where a permanent magnet is arrange | positioned) of FIG. It is a side view (figure seen from the surface direction parallel to a needle axis line) of the inner magnetic pole part and center pillar of a 1st embodiment. It is a side view (figure seen from the surface direction parallel to a needle axis) of the separator between magnetic poles of a 1st embodiment. It is the figure which looked at the separator between magnetic poles of 1st Embodiment from the F arrow direction of FIG. 16 (the side opposite to the side by which a permanent magnet is arrange | positioned). It is the figure which looked at the separator between magnetic poles of 1st Embodiment from the G arrow direction (side where a permanent magnet is arrange | positioned) of FIG. It is the figure which showed typically a magnetic core, an electromagnetic coil, an outer magnetic pole part, and an inner magnetic pole part, Comprising: It is a figure which showed generating an N pole in an inner magnetic pole part, and generating an S pole in an outer magnetic pole part. It is the figure which showed a permanent magnet, a pair of electromagnet, a needle, and a discharge port, Comprising: It is a figure which showed the motion of the magnetic pole of an electromagnet, the magnetic pole of a permanent magnet, and a needle at the time of opening a discharge port. It is the figure which showed typically a magnetic core, an electromagnetic coil, an outer magnetic pole part, and an inner magnetic pole part, Comprising: It is a figure which showed generating an N pole in an inner magnetic pole part and an outer magnetic pole part. It is the figure which showed a permanent magnet, a pair of electromagnet, a needle, and a discharge port, Comprising: It is a figure which showed the motion of the magnetic pole of an electromagnet, the magnetic pole of a permanent magnet, and a needle when closing a discharge port. It is sectional drawing of a module body and the permanent magnet and electromagnet provided in the inside, Comprising: It is the figure which showed the flow of the cooling air introduced in the module body with the arrow. It is sectional drawing of the fluid discharge apparatus of 2nd Embodiment. It is sectional drawing of the electromagnet of 2nd Embodiment. In 2nd Embodiment, it is the figure which looked at the magnetic core, the seat part, and the center support | pillar from the opposite side to the side in which the magnetic pole surface of an electromagnet is provided. It is the figure which added the electromagnetic coil further from FIG. It is the figure which added the wind guide cover further from FIG. It is a top view of the wind guide cover of 2nd Embodiment. It is the figure which showed the 1st example of a shape of the plate between magnetic poles of 2nd Embodiment, Comprising: It is a side view of the plate between magnetic poles. It is a top view of the plate between magnetic poles of FIG. It is the figure which showed the 2nd example of a shape of the plate between magnetic poles of 2nd Embodiment, Comprising: It is a side view of the plate between magnetic poles. It is a top view of the plate between magnetic poles of FIG. It is the figure which showed the 3rd example of a shape of the plate between magnetic poles of 2nd Embodiment, Comprising: It is a side view of the plate between magnetic poles. It is a top view of the plate between magnetic poles of FIG. It is a perspective view of the permanent magnet in 3rd Embodiment, Comprising: It is the figure which showed the magnetic pole of the permanent magnet. It is sectional drawing of the electromagnet of 3rd Embodiment. It is the figure which looked at the magnetic core and electromagnetic coil of 3rd Embodiment from the surface direction parallel to a needle axis line and parallel to the center axis line of a magnetic core. It is the figure which looked at the magnetic core and electromagnetic coil of 3rd Embodiment from the surface direction orthogonal to a needle axis. In 3rd Embodiment, it is the figure which looked at the state which six magnetic cores combined from the surface direction orthogonal to a needle axis. It is a side view of the center support | pillar of the electromagnet of 3rd Embodiment. In 3rd Embodiment, it is the figure which looked at the state which six outer magnetic pole parts and six inner magnetic pole parts combined from the surface direction orthogonal to a needle axis. It is the figure which looked at the outer magnetic pole part of 3rd Embodiment from the opposite side of the magnetic pole surface. It is the figure which looked at the outer magnetic pole part of 3rd Embodiment from the H arrow direction of FIG. It is the figure which looked at the outer magnetic pole part of 3rd Embodiment from the I arrow direction of FIG. It is the figure which looked at the outer magnetic pole part of 3rd Embodiment from the J arrow direction of FIG. It is the figure which looked at the inner magnetic pole part of 3rd Embodiment from the opposite side of the magnetic pole surface. It is the figure which looked at the inner magnetic pole part of 3rd Embodiment from the K arrow direction of FIG. It is the figure which looked at the inner magnetic pole part of 3rd Embodiment from the L arrow direction of FIG. It is the figure which looked at the inner magnetic pole part of 3rd Embodiment from the M arrow direction of FIG. It is a side view of the upper surface fixed cover of 3rd Embodiment. It is the figure which looked at the upper surface fixed cover of 3rd Embodiment from the N arrow direction of FIG. It is the figure which looked at the upper surface fixed cover of 3rd Embodiment from the O arrow direction of FIG. It is a side view of the lower surface fixing cover of 3rd Embodiment. It is the figure which looked at the lower surface fixing cover of 3rd Embodiment from the P arrow direction of FIG. It is the figure which looked at the lower surface fixing cover of 3rd Embodiment from the Q arrow direction of FIG. It is a side view of the separator between magnetic poles of 3rd Embodiment. It is the figure which looked at the separator between magnetic poles of 3rd Embodiment from the R arrow direction of FIG. It is the figure which looked at the separator between magnetic poles of 3rd Embodiment from the S arrow direction of FIG. The figure which showed typically a magnetic core, an electromagnetic coil, an outer magnetic pole surface, and an inner magnetic pole surface, Comprising: The figure which produced | generated N pole and S pole alternately in the circumferential direction in an outer magnetic pole surface and an inner magnetic pole surface It is. It is sectional drawing of the electromagnet of 4th Embodiment. It is the figure which showed the permanent magnet and the pair of electromagnet in 5th Embodiment, Comprising: It is the figure which showed the magnetic pole at the time of closing an ejection outlet. It is the figure which showed the permanent magnet and pair of electromagnet in 5th Embodiment, Comprising: It is the figure which showed the magnetic pole at the time of opening a discharge outlet. In the structure which opens and closes a discharge port by air drive, it is the figure which showed the electrical signal for moving a needle, and the movement of a needle, when the opening and closing speed of a discharge port is a low speed and a high speed, respectively. It is the figure which showed the structure of 6th Embodiment, and showed the magnetic pole of the electromagnet at the time of opening a discharge outlet, and the magnetic pole of a permanent magnet. It is the figure which showed the structure of 6th Embodiment, and showed the magnetic pole of the electromagnet at the time of closing an ejection opening, and the magnetic pole of a permanent magnet.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of a fluid ejection device 1 of the present embodiment. The fluid discharge device 1 is a device that discharges a hot melt adhesive for bonding members constituting a paper diaper, for example.

  The fluid ejection device 1 includes a housing 2. The housing 2 extends in the direction of the axis L1 of the needle 10 to be described later, and is formed in a shape (substantially cylindrical) having an accommodating space for accommodating the needle 10 and the like inside. In the following description, it is assumed that the axis of the housing 2 coincides with the axis L1 of the needle 10. The housing 2 is composed of a plurality of members. Specifically, the housing 2 is configured such that the seat block 3, the base block 4, the heat insulating block 5, the module body 13, and the head cover 14 are stacked in the direction of the axis L1 from the front end side. Each of the members 3, 4, 5, 13, and 14 is formed in a substantially cylindrical shape, and is formed so as to form a continuous internal space from the upper end to the lower end (tip) of the housing. In addition, the connection method of each member 3, 4, 5, 13, 14 which comprises the housing 2 may be what kind of methods, such as a fitting and bolt fastening.

  The seat block 3 is a member that constitutes the distal end portion of the housing 2. Specifically, a hot melt adhesive discharge port 3 a is formed at the front end of the sheet block 3. The discharge port 3a is formed at the position of the axis L1. In addition, an inlet 3 b for introducing the hot melt adhesive into the seat block 3 is formed in the seat block 3 so as to penetrate the side wall of the seat block 3. A part of the tip side of the needle 10 is disposed in the seat block 3, and the hot melt adhesive introduced from the inlet 3 b is discharged between the side surface of the needle 10 and the inner wall of the seat block 3. The flow path 3c leading to is formed. The sheet block 3 may be formed of any material as long as it can withstand hot melt adhesive at high temperatures (for example, about 150 ° C.), such as a quenching material. It may be formed of a high strength steel. The hot melt adhesive discharged from the discharge port 3a passes through the flow channel 101 in the body 100 to which the fluid discharge device 1 is attached, and the work (for example, a paper diaper) is discharged from the nozzle 110 provided at the tip of the flow channel 101. Material).

  Further, a ring-shaped groove 3d is formed on the outer peripheral surface of the seat block 3 over the entire circumference in the circumferential direction of the outer peripheral surface. The groove 3d is formed at a position closer to the discharge port 3a than the inlet 3b. An O-ring 11 is provided in the groove 3d. The O-ring 11 is for preventing hot melt adhesive from flowing out downstream of the discharge port 3a via the outer peripheral surface of the sheet block 3 when flowing into the flow path 3c from the inlet 3b.

  Although FIG. 1 shows an example in which the housing 2 is provided so that the discharge port 3a faces vertically downward, the housing is arranged so that the discharge port 3a faces in a direction other than the vertical downward direction (for example, upward or horizontal direction). 2 may be provided.

  In the base block 4, a recess 4 a is formed at the position of the center hole into which the needle 10 is inserted and at a position closer to the seat block 3 than the window 6 described later. A seal ring 7 is provided in the recess 4a to prevent the hot melt adhesive introduced into the seat block 3 from leaking to the magnets 11, 13, and 14 side. The seal ring 7 is formed in a ring shape, and is provided so that the inner peripheral portion thereof is in contact with the side surface of the needle 10. The seal ring 7 can be made of, for example, PEEK resin (polyether ether ketone resin). A spacer ring 8 is covered on the outer side of the seal ring 7, and a snap ring 9 for an inner cylinder is provided on the surface of the spacer ring 8 opposite to the seal ring 7 side. The spacer ring 8 and the snap ring 9 prevent the seal ring 7 from being detached from the recess 4a.

  A ring-shaped groove 4c is formed on the outer peripheral surface of the base block 4 over the entire circumference of the outer peripheral surface in the circumferential direction. The groove 4c is provided on the side of the connecting portion with the seat block 3 with respect to the window portion 6 described later. An O-ring 12 is provided in the groove 4c. The O-ring 12 is for preventing the hot melt adhesive from flowing out to the outer peripheral surface of the seat block 3 and the surface of the body 100 when the hot-melt adhesive flows around from the inlet 3b to the flow path 3c.

  Part of the seat block 3 and the base block 4 from the lower end is attached to the body 100 and positioned inside the body 100. The body 100 is controlled to a high temperature (for example, about 150 ° C.) in order to maintain the heated state of the hot melt adhesive. Further, a through portion 4 b that penetrates the side wall of the base block 4 is formed. The penetrating portion 4b is formed so as to reach the upper end of the side wall of the base block 4, and specifically, is formed in a U shape when viewed in a side view of FIG. Moreover, the penetration part 4b is combined with the penetration part 5a of the below-mentioned heat insulation block 5, and forms the substantially circular window part 6 (through-hole). The window portion 6 is a hole for discharging the cooling air introduced into the housing 2 to the outside. In addition, the window portion 6 is applied to the needle 10 by using a function of confirming leakage of the hot melt adhesive when the seal ring 7 is broken or worn, and cooling air flowing out from the body 100. The heat sink fin (not shown) is attached to the chamfered portion 10d, and the hole has a function of releasing heat transmitted from the tip 10a of the needle 10 to the magnets 16, 20, and 21 side. The base block 4 is formed of, for example, ultra duralumin.

  The heat insulating block 5 is a member for suppressing the heat from the sheet block 3 and the base block 4 that are at a high temperature due to the hot hot melt adhesive and the heat of the body 100 from being transmitted to the module body 13. Further, it is made of a material (for example, PAI (polyamideimide) resin) having a lower thermal conductivity than the sheet block 3 and the base block 4. On the side wall of the heat insulating block 5, a through portion 5a penetrating the side wall is formed. The penetrating part 5a is formed so as to reach the lower end of the heat insulating block 5, and specifically, is formed in an inverted U shape when viewed in a side view of FIG. A lower end of the penetrating portion 5 a and an upper end of the penetrating portion 4 b of the base block 4 are connected to form one window portion 6. Note that any number of the window portions 6 may be formed along the circumferential direction of the base block 4 and the heat insulating block 5. The heat insulating block 5 corresponds to the heat insulating portion of the present invention.

  The module body 13 is a member for arranging a permanent magnet 16 and a pair of electromagnets 20 and 21 to be described later. The module body 13 is formed of, for example, ultra-duralumin, but may be formed of a material having a magnetic shield function (permalloy or the like) when shielding is required due to magnetic influence. The module body 13 is formed with an inlet 13 a for injecting air for cooling the electromagnets 20 and 21 into the module body 13. The injection port 13a is formed at a position of the permanent magnet 16 among positions along the axis L1, in other words, at a position intermediate between the pair of electromagnets 20 and 21. Moreover, although the injection port 13a is formed only in one place, how many may be formed along the circumferential direction of the module body 13.

  A joint 300 (see FIG. 23) with a fixed throttle function is connected to the inlet 13a, and an air pipe 32 (see FIG. 23) is connected to the joint 300. As described above, by using the joint 300 with the fixed throttle function, even when a plurality of fluid discharge devices 1 are mounted on the body 100, uniform cooling air can be injected into the housing 2 of each device 1. It becomes. The amount of cooling air can be adjusted by the pressure reducing valve installed upstream of the joint 300, and the injection of the cooling air can be managed by the pressure value of the pressure reducing valve.

  Further, a groove 13b is formed on the inner wall of the module body 13 over the entire circumference in the circumferential direction of the inner wall. The groove 13b is formed so as to be connected to the injection port 13a at the same position as the injection port 13a in the axial direction of the module body 13. The groove 13 b is formed to have a size larger than the gap between the permanent magnet 16 and the inner wall of the module body 13. The groove 13b is a groove serving as a flow path for the cooling air injected into the injection port 13a, that is, for supplying the cooling air into the module body 13 from the entire circumference in the circumferential direction.

  The head cover 14 is a member that constitutes the head of the housing 2. In the head cover 14, a slide bush 15 is provided as a guide portion that allows the needle 10 to move in the direction of the axis L1 and restricts the movement in other directions. Further, the head cover 14 is formed with a discharge port 14a for air introduced from the injection port 13a. The head cover 14 is formed of, for example, ultra duralumin.

  In addition to the housing 2, the fluid ejection device 1 includes a needle 10, a permanent magnet 16, and a pair of electromagnets 20 and 21. The needle 10 is a member formed in the shape of an elongated bar for opening and closing the discharge port 3a. Specifically, the needle 10 has a distal end portion 10a that is disposed outside the housing 2 and opens and closes the discharge port 3a. The tip portion 10a is formed with a larger diameter than the discharge port 3a. Parts other than the tip 10 a of the needle 10 are provided in the housing 2. That is, the needle 10 has a portion 10c inserted through the discharge port 3a. The needle 10 has a length that reaches a slide bush 15 provided in the head cover 14.

  Further, the needle 10 is provided at a position where the axis L1 coincides with the center axis of the housing 2. The needle 10 can be moved in the direction of the axis L1 between the position where the discharge port 3a is opened and the position where the discharge port 3a is closed by the slide bush 15 provided in the housing 2, but the direction is perpendicular to the axis L1. It is provided so that it cannot move in the radial direction. The needle 10 is not restricted from moving in the rotational direction around the axis L1. Further, a thread groove 10 b is formed on a side surface of a partial section of the needle 10. The thread groove 10b is formed in a portion where the permanent magnet 16 is disposed. Further, a chamfered portion 10 d is formed in a partial section along the axis L <b> 1 of the needle 10. The chamfered portion 10 d is formed at the position of the window portion 6. A heat radiating fin is attached to the chamfered portion 10d. The needle 10 corresponds to the movable part of the present invention. The tip portion 10a corresponds to the opening / closing portion of the present invention.

  The permanent magnet 16 is formed in a disk shape. The permanent magnet 16 is formed with an insertion hole 16a for the needle 10 at the position of the central axis L2 (see FIG. 2). Further, an inlay recess 16 b in which a permanent magnet fixing nut 17 described later is disposed is formed on one surface 161 of the permanent magnet 16. The recess 16b is formed in a diameter that matches the diameter of the nut 17 at the position of the insertion hole 16a. Further, the other surface 162 of the permanent magnet 16 is formed with a hollow 16c of an inlay in which a nut 18 for clearance adjustment described later is disposed. The recess 16c is formed in a diameter that matches the diameter of the nut 18 at the position of the insertion hole 16a. The permanent magnet 16 is provided in the module body 13 such that one surface 161 faces the one electromagnet 20 and the other surface 162 faces the other electromagnet 21. The permanent magnet 16 is provided so that the central axis L2 (see FIG. 2) thereof coincides with the axis L1 of the needle 10, that is, the needle 10 is inserted through the insertion hole 16a.

  A nut 17 for fixing the permanent magnet is disposed in the recess 16 b on the upper side of the permanent magnet 16. Further, a nut 18 for adjusting the clearance is disposed in the depression 16 c below the permanent magnet 16. The needle 10 is inserted through these nuts 17 and 18. And the permanent magnet 16 is being fixed to the needle 10 because the screw groove formed in the internal peripheral surface of the upper nut 17 and the screw groove 10b formed in the side surface of the needle 10 fit. That is, the permanent magnet 16 is provided such that it cannot be displaced relative to the needle 10 in all directions including the direction of the axis L1. In other words, the permanent magnet 16 moves in conjunction with the movement of the needle 10. It is provided as follows. Further, the thread groove formed on the inner peripheral surface of the lower nut 18 and the thread groove 10 b formed on the side surface of the needle 10 are fitted. The nut 18 adjusts the clearance between the permanent magnet 16 and the electromagnets 20 and 21, that is, the amount of movement of the needle 10 to a predetermined value (for example, 0.3 mm).

The assembly of the permanent magnet 16 to the fluid ejection device 1 and the adjustment of the above-mentioned Clarins are carried out by the following procedures (1) to (7).
(1) The needle 10 is passed through the seat block 3.
(2) The needle 10 is passed through the base block 4 incorporating the seal ring 7.
(3) The needle 10 is attached by penetrating the lower electromagnet 21 in the direction in which the antimagnetic pole surface (the surface opposite to the permanent magnet 16 side) contacts the base block 4.
(4) The side of the permanent magnet 16 to which the nut 18 is bonded is brought closer to the screw groove 10b of the needle 10 while being rotated toward the magnetic pole surface side of the electromagnet 21 attached earlier.
(5) A part of the thickness gauge having a predetermined thickness (for example, 0.3 mm) is sandwiched between the magnetic pole surface of the electromagnet 21 and the permanent magnet 16 after fixing the parts assembled to the needle 10 so as to be in close contact with each other. .
(6) The permanent magnet 16 is further tightened with the thickness gauge being sandwiched, and the rotation of the permanent magnet 16 is stopped at a position where the gap is appropriate.
(7) While taking care not to rotate the permanent magnet 16, attach the nut 17 for fixing the permanent magnet to the thread groove 10 b of the needle 10 while rotating it, and rotate it until it comes into close contact with the permanent magnet 16. Tighten and fix.

  As shown in FIG. 2, the permanent magnet 16 is configured such that the N pole and the S pole are arranged in a radial direction that is a direction perpendicular to the central axis L <b> 2 of the permanent magnet 16. Specifically, the permanent magnet 16 is positioned on both surfaces 161 and 162, the outer portion 16d set to the same magnetic pole over the entire circumference in the circumferential direction around the axis L2, and the inner side of the outer portion 16d. Thus, it has an inner portion 16e set to a magnetic pole opposite to the magnetic pole of the outer portion 16d over the entire circumference in the circumferential direction. In the example of FIG. 2, an S pole is set on the outer side 16 d of the surface 161 facing the upper electromagnet 20, an N pole is set on the inner side 16 e, and an N pole is set on the outer side 16 d of the surface 162 facing the lower electromagnet 21. An example in which the south pole is set in the inner portion 16e is shown. The magnetization direction of the permanent magnet 16 is parallel to the axis L2, that is, the needle axis L1. As a result, the magnetic poles appearing on both surfaces 161 and 162 are opposite to each other. The outer portion 16d corresponds to the first magnetic pole portion of the present invention, and the inner portion 16e corresponds to the second magnetic pole portion of the present invention.

  The material of the permanent magnet 16 can be, for example, neodymium. The permanent magnet 16 is obtained, for example, by preparing a disk of magnetic material such as neodymium and magnetizing the disk with a magnetizing yoke so as to have the magnetic pole arrangement shown in FIG. The magnetization direction of the disc body by the magnetizing yoke is set in a direction parallel to the axis L1 as described above. The insertion hole 16a and the recesses 16b and 16c are formed before magnetization.

  The pair of electromagnets 20 and 21 are provided in the module body 13 so as to sandwich the permanent magnet 16 therebetween. That is, one electromagnet 20 is provided to face the upper surface 161 of the permanent magnet 16 at a position above the permanent magnet 16. The other electromagnet 21 is provided to face the lower surface 162 of the permanent magnet 16 at a position below the permanent magnet 16. The electromagnets 20 and 21 are provided with a space between the surfaces 161 and 162 of the permanent magnet 16. The interval between the permanent magnet 16 and the electromagnets 20 and 21 is set to an interval at which the needle 10 can be moved by the attractive force or repulsive force based on the magnetic field generated between them to open and close the discharge port 3a. Further, the electromagnets 20 and 21 are fixed in the module body 13, that is, provided so as not to change positions without being interlocked with the movement of the needle 10 and the permanent magnet 16.

  As shown in FIG. 3, the electromagnets 20 and 21 include a magnetic core 22 formed of a magnetic material, an electromagnetic coil 23 wound around the magnetic core 22, and a magnetic pole generated on one end side of the magnetic core 22. An outer magnetic pole portion 24 that leads to a position facing the outer side portion 16d (see FIG. 2), and an inner pole that leads the magnetic pole generated on the other end side of the magnetic core 22 to a position facing the inner side portion 16e (see FIG. 2) of the permanent magnet 16 And at least a magnetic pole portion 25. For example, the magnetic core 22 may be configured as a powder magnetic core of powder sintered metal, or may be configured of a soft magnetic material such as permalloy. As shown in FIG. 4, six magnetic cores 22 are provided at intervals of 60 ° in the circumferential direction centered on the position O of the needle axis L1. That is, the magnetic core 22 is divided into six in the circumferential direction. The six magnetic cores 22 are provided so as to radiate radially around the position O.

  The six magnetic cores 22 are formed in the same shape. Specifically, as shown in FIGS. 5 to 8, the magnetic core 22 includes a shaft portion 221, an inner peripheral portion 222 connected to an end portion of the shaft portion 221 on the center O (see FIG. 4) side, a center O, And an outer peripheral portion 223 connected to the end portion of the opposite shaft portion 221.

  The shaft portion 221 is a portion around which the electromagnetic coil 23 is actually wound, and is provided so as to be inserted into the electromagnetic coil 23 (see FIGS. 9 and 10). The shaft portion 221 is provided such that the axis L3 that is the winding center of the electromagnetic coil 23 faces the radial direction that is a direction perpendicular to the needle axis L1. Further, the shaft portion 221 has a constant width in a direction perpendicular to the central axis L3 at any position along the central axis L3 when viewed from the direction of FIG. 5 (a direction viewed from a plane perpendicular to the needle axis L1). It is formed in a certain shape. That is, the shaft part 221 is linearly formed in the direction of the axis L3 when viewed from the direction of FIG.

  Further, the shaft portion 221 has a width in a direction perpendicular to the central axis L3 when viewed from the direction of FIG. 6 (a direction viewed from a plane parallel to both the needle axis L1 and the axis L3 of the shaft portion 221). It is formed in a shape that gradually increases from 223 to the inner periphery 222. That is, the shaft part 221 is formed in a trapezoidal shape with the side connected to the inner peripheral part 222 as the base and the side connected to the outer peripheral part 223 as the upper side when viewed from the direction of FIG. Note that the angle θ formed by both side surfaces of the shaft portion 221 when viewed from the direction of FIG. 6 is set to 60 ° in accordance with the arrangement interval (60 °) in the circumferential direction of the six magnetic cores 22.

  The inner peripheral portion 222 is provided so as to project in a direction perpendicular to the central axis L3 of the shaft portion 221. This overhang amount is smaller than the overhang amount of the outer peripheral portion 223 when viewed from the direction of FIG. A surface 222a of the inner peripheral portion 222 facing the center O (see FIG. 4) is formed in an arc shape when viewed from the direction of FIG. The central angle of the arc is set to 60 ° in accordance with the arrangement interval (60 °) in the circumferential direction of the six magnetic cores 22. Then, six circular arc surfaces 222a are combined to form a circular hole 222c (see FIG. 4). In addition, a surface 222b (see FIGS. 5 and 6) of the inner peripheral portion 222 facing the shaft portion 221 is a flat surface for defining one end position of the electromagnetic coil 23 in the direction of the central axis L3. It has become. The flat surface 222b and the electromagnetic coil 23 are in contact with each other, thereby preventing the electromagnetic coil 23 from coming off the shaft portion 221.

  The outer peripheral part 223 is provided so as to project in a direction perpendicular to the central axis L3 of the shaft part 221. This overhang amount is larger than the overhang amount of the inner peripheral portion 222 as viewed from the direction of FIG. Further, a surface 223a (see FIG. 5) facing the direction opposite to the center O (see FIG. 4) of the outer peripheral portion 223 is formed in an arc shape when viewed from the direction of FIG. The central angle of the arc is set to 60 ° in accordance with the arrangement interval (60 °) in the circumferential direction of the six magnetic cores 22. A circular surface 223c (see FIG. 4) is formed by combining six arc surfaces 223a. Further, a surface 223b (see FIGS. 5 and 6) of the outer peripheral portion 223 facing the shaft portion 221 is a flat surface for defining the other end position of the electromagnetic coil 23 in the direction of the central axis L3. It has become. The flat surface 223b and the electromagnetic coil 23 are in contact with each other, thereby preventing the electromagnetic coil 23 from coming off the shaft portion 221.

  As described above, the six magnetic cores 22 are provided so that the inner peripheral portions 222 and the outer peripheral portions 223 of the adjacent magnetic cores 22 are in contact with each other (see FIG. 4). One of the N pole and the S pole is generated in the ring-shaped outer peripheral portion 223, and a magnetic pole opposite to the magnetic pole of the outer peripheral portion 223 is generated in the ring-shaped inner peripheral portion 222, which is a combination of six.

  The electromagnetic coil 23 is provided for each magnetic core 22. The electromagnetic coil 23 is wound around the central axis L <b> 3 around the shaft portion 221 of the magnetic core 22. At this time, the outer peripheral line 231 formed by the electromagnetic coil 23 located on the outermost side as viewed from the direction of FIG. 10 (the direction seen from the plane parallel to both the needle axis L1 and the center axis L3) is the center axis L3. The electromagnetic coil 23 is wound around the shaft portion 221 so as to be in parallel. Since the shaft portion 221 is formed in a straight line when viewed from the direction of FIG. 5 and a trapezoidal shape when viewed from the direction of FIG. 6, the electromagnetic coil 23 wound around the shaft portion 221 has an outer peripheral portion 223 of the magnetic core 22. Is provided so that the number of turns decreases from the inner periphery 222 toward the inner periphery 222 (see FIGS. 9 and 10).

  In other words, the outer peripheral line 232 formed by the electromagnetic coil 23 located on the outermost side as viewed from the direction of FIG. 9 (the direction viewed from the plane perpendicular to the needle axis L1) is the inner side from the outer peripheral part 223 of the magnetic core 22. The electromagnetic coil 23 is wound around the shaft portion 221 so as to gradually approach the central axis L3 as it goes to the peripheral portion 222. The angle between both outer peripheral lines 232 in FIG. 9 is a value corresponding to the angle θ between the side surfaces of the shaft portion 221 (see FIG. 6), and specifically 60 °. That is, the electromagnetic coil 23 is wound in a trapezoidal shape with the portion that contacts the outer peripheral portion 223 as the bottom and the portion that contacts the inner peripheral portion 222 as the upper side as viewed from the direction of FIG. 9.

  Thus, the electromagnetic coil 23 is wound around each magnetic core 22 in a trapezoidal shape, so that the interval between the adjacent electromagnetic coils 23 can be narrowed as shown in FIG. 11, and the entire shape in which the six electromagnetic coils 23 are combined. Can be made into a donut shape. The adjacent electromagnetic coils 23 are not in contact with each other, and are actually provided with a space.

  The electromagnetic coil 23 of the upper electromagnet 20 is wound in the same direction between the six magnetic cores 22 constituting the electromagnet 20. Similarly, the electromagnetic coil 23 of the lower electromagnet 21 is wound in the same direction between the six magnetic cores 22 constituting the electromagnet 21. Further, between the upper electromagnet 20 and the lower electromagnet 21, the winding direction of the electromagnetic coil 23 may be the same direction or the opposite direction.

  The outer magnetic pole portion 24 in FIG. 3 is formed of a magnetic material (permalloy or the like). The outer magnetic pole part 24 is formed in a ring shape as shown in FIGS. Specifically, the outer magnetic pole portion 24 is formed with a circular center hole 24b at the center position when viewed from the direction of FIGS. An inter-magnetic pole separator 26 and an inner magnetic pole portion 25 are disposed inside the center hole 24b. Further, a depression 24 c is formed on one surface side of the outer magnetic pole part 24. The recess 24c is formed so as to be electrically connected to the center hole 24b and has a larger diameter than the center hole 24b. Further, in the outer magnetic pole portion 24, recesses 24d are formed at intervals of 120 ° along the edge line of the center hole 24b. These three recesses 24d are grooves for fitting the outer protrusions 262 (see FIGS. 16 to 18) of the inter-magnetic pole separator 26. Note that the recessed portion 24d and the outer protrusion 262 may not have a fitting shape. In this case, the position of the outer magnetic pole portion 24 is determined by using an integrally molded product of the outer magnetic pole portion 24 and resin, and cooling is performed. Ensure air flow.

  The outer magnetic pole portion 24 is provided at the end of the electromagnets 20 and 21 on the permanent magnet 16 side in the direction parallel to the needle axis L1. That is, the outer magnetic pole portion 24 of the upper electromagnet 20 is provided at the end facing the upper surface 161 of the permanent magnet 16. The outer magnetic pole portion 24 of the lower electromagnet 21 is provided at the end facing the lower surface 162 of the permanent magnet 16. At this time, the outer magnetic pole portion 24 is provided so that the depression 24c side faces the magnetic core 22 and the surface 24a opposite to the depression 24c faces the permanent magnet 16 side. At this time, the surface 24a is provided in the same shape (ring shape) as the outer portion 16d at a position facing the outer portion 16d of the permanent magnet 16. As shown in FIG. 3, one end 223a of the outer peripheral portion 223 of the magnetic core 22 in the direction of the needle axis L1 is caught in the recess 24c. That is, the outer magnetic pole portion 24 is in contact with each outer peripheral portion 223 of the six magnetic cores 22. The outer magnetic pole portion 24 is not in contact with the inner peripheral portion 222 of the magnetic core 22.

  The inner magnetic pole portion 25 is formed of a magnetic material (permalloy or the like). The inner magnetic pole portion 25 is provided at the end of the electromagnets 20 and 21 on the permanent magnet 16 side of the central axis (a line that coincides with the needle axis L1). That is, the inner magnetic pole portion 25 of the upper electromagnet 20 is provided at the end facing the upper surface 161 of the permanent magnet 16. The inner magnetic pole portion 25 of the lower electromagnet 21 is provided at the end facing the lower surface 162 of the permanent magnet 16. Further, the inner magnetic pole portion 25 has a magnetic pole surface 25a that is provided at a radially inner position so as to face the inner portion 16e (see FIG. 2) of the permanent magnet 16 (see FIG. 3). ). The magnetic pole surface 25a is formed in a ring shape in the circumferential direction with respect to the central axis of the electromagnets 20 and 21 according to the shape of the inner portion 16e.

  Further, the inner magnetic pole portion 25 is provided so as to contact each inner peripheral portion 222 of the six magnetic cores 22 and not to contact each outer peripheral portion 223. Specifically, as shown in FIG. 3, the surface 25c of the inner magnetic pole portion 25 opposite to the magnetic pole surface 25a and the one end 222d of the inner peripheral portion 222 of the magnetic core 22 in the direction parallel to the needle axis L1 are in contact with each other. Yes. Further, a recess 25b is formed on the magnetic pole surface 25a side of the inner magnetic pole portion 25 (see FIG. 15). A magnetic pole surface 25a is formed so as to sandwich the recess 25b. The depression 25 b of the upper electromagnet 20 is for avoiding interference between the fixing nut 17 (see FIG. 1) of the permanent magnet 16 and the electromagnet 20. The depression 25b prevents the fixing nut 17 and the electromagnet 20 from colliding when the needle 10 moves up and down. Similarly, the depression 25 b of the lower electromagnet 21 is for avoiding interference between the electromagnet 21 and the nut 18 for adjusting the clearance of the permanent magnet 16 (see FIG. 1). The recess 25b prevents the clearance adjusting nut 18 and the electromagnet 21 from colliding when the needle 10 moves up and down.

  Further, the outer magnetic pole part 24 and the inner magnetic pole part 25 are provided in a form that is magnetically separated from each other. Specifically, the outer magnetic pole part 24 and the inner magnetic pole part 25 are provided with a space therebetween. At this interval, an inter-magnetic pole separator 26 for separating the magnetic pole portions 24 and 25 is provided. The inter-magnetic pole separator 26 is formed of a non-magnetic material (for example, a resin or a non-magnetic metal (phosphor bronze or the like)) so as to prevent exchange of magnetic force between the magnetic pole portions 24 and 25.

  As shown in FIGS. 16 to 18, the inter-magnetic pole separator 26 is provided in a form divided into three. The three divided portions 26a are formed in the same shape as each other so as to protrude radially outward from an arc portion 261 formed in an arc shape when viewed from the direction of FIGS. 17 and 18 and an intermediate position of the arc portion 261. And an inner protrusion 263 provided so as to protrude radially inward from an intermediate position of the arc portion 261. The three divided portions 26a are provided so that the respective arc portions 261 are arranged on the same circumferential line. Further, the outer protrusion 262 fits into the recess 24 d (see FIGS. 12 to 14) of the outer magnetic pole portion 24. The inner protrusion 263 is fitted in a recess (not shown) formed in the inner magnetic pole portion 25. Note that the structure of the inter-magnetic pole separator 26 does not necessarily have to be a three-part structure, and may be an integral molding. Further, the protrusions 262 and 263 that restrict the rotation in the circumferential direction are not necessarily required. However, in any case, it is necessary to determine the shape of the inter-magnetic pole separator 26 so as not to restrict the flow of cooling air from the permanent magnet 16 side into the electromagnets 20 and 21. If possible, it is desirable that the interpolar separator 26 has a function of rectifying the flowing cooling air so that the electromagnets 20 and 21 can be effectively cooled.

  Further, the distance between the outer magnetic pole part 24 and the inner magnetic pole part 25 is the distance between the magnetic pole surfaces 24a, 25a of the magnetic pole parts 24, 25 and the permanent magnet 16 (the movable permanent magnet 16 is the most from the magnetic pole surfaces 24a, 25a). It is larger than the interval in the case of being at a distant position.

  In addition to the magnetic core 22, the electromagnetic coil 23, the outer magnetic pole part 24, the inner magnetic pole part 25, and the inter-magnetic pole separator 26, the electromagnets 20 and 21 include a center column 27, a coil cover 28, a coil terminal 29, a terminal cover 30, and a nut 31. I have. The center column 27 is formed in a cylindrical shape, and is provided so that its center axis coincides with the needle axis L1. That is, the central support column 27 is provided so as to be inserted into a hole 222 c (see FIG. 4) formed in the inner peripheral portion 222 of the six magnetic cores 22. At this time, the wall surface of the hole 222 c comes into contact with the outer peripheral surface of the central column 27. The center column 27 is formed of a magnetic material such as permalloy. As shown in FIG. 15, the inner magnetic pole portion 25 is integrally provided on one end side of the center column 27. That is, the center column 27 and the inner magnetic pole part 25 are provided as an integrated product with the same material. Further, the side of the center column 27 opposite to the side where the inner magnetic pole portion 25 is provided is provided so as to protrude from the magnetic core 22, and a screw groove 27 a is formed on the outer peripheral surface thereof. In addition, as shown in FIG. 25 of 2nd Embodiment mentioned later, when fixing by the system using a snap ring, the screw groove 27a does not need to be formed.

  The coil cover 28 is provided so as to cover the side opposite to the side where the magnetic pole portions 24 and 25 are provided in the direction of the needle axis L1 of the magnetic core 22 and the electromagnetic coil 23 wound around the magnetic core 22. The coil cover 28 is provided so as to be fitted to the end portion of the outer peripheral portion 223 of each magnetic core 22 on the side opposite to the side where the magnetic pole portions 24 and 25 are provided. The coil cover 28 is made of resin.

  The coil terminal 29 includes a first terminal connected to one end of each electromagnetic coil 23 (end on the inner peripheral portion 222 side of the magnetic core 22) and the other end of each electromagnetic coil 23 (end on the outer peripheral portion 223 side of the magnetic core 22). Part) connected to the second terminal. One end of the six electromagnetic coils 23 is connected to the first terminal, and the other end of the six electromagnetic coils 23 is connected to the second terminal. The coil terminal 29 (first terminal, second terminal) is electrically connected to an energization control unit 61 described later. A voltage is applied to the coil terminal 29 by the energization control unit 61, and the energization direction of each electromagnetic coil 23 is switched according to whether the potential of the first terminal is positive or negative with respect to the potential of the second terminal.

  The terminal cover 30 covers the lead wires drawn from the electromagnetic coils 23 toward the coil cover 28 so as not to be exposed, and is attached to the coil cover 28. The terminal cover 30 is made of resin. Further, the terminal cover 30 is formed with a hole 30a into which the central support column 27 is inserted.

  The nut 31 is provided so as to be fitted with a thread groove 27 a formed in the center column 27. By fastening the nut 31 and the central column 27, the members constituting the electromagnets 20 and 21 (six magnetic cores 22, the central column 27, the covers 28 and 30 and the like) are integrated so as not to fall apart. Instead of fitting with the nut 31 and the thread groove 27a, each member may be fixed by a snap ring method as shown in FIG. 25 of the second embodiment described later. In this case, as in FIG. 25, it corresponds to the snap ring provided at the end opposite to the side where the inner magnetic pole part 39 of the central column 27 is provided and the tightening with the screw provided at this end. And a washer sandwiched between the snap ring and the spring.

The electromagnets 20 and 21 are assembled by the following procedures (1) to (5).
(1) A magnetic pole separator 26 is attached to the inner magnetic pole portion 25.
(2) The outer magnetic pole part 24 is attached to the outside of the inter-magnetic pole separator 26.
(3) Assembling the six magnetic cores 22 around which the electromagnetic coil 23 is wound.
(4) The coil cover 28 is placed on the top surfaces of the magnetic core 22 and the electromagnetic coil 23, and each electromagnetic coil 23 is connected to the coil terminal 29.
(5) After placing the terminal cover 30, the whole is tightened with the nut 31.

  The electromagnets 20 and 21 are provided so that the needle 10 is inserted inside the center support column 27. At this time, the circular surface 223 c (see FIG. 4) formed by the outer peripheral portions 223 of the six magnetic cores 22 contacts the circular inner peripheral surface of the module body 13. Thereby, the electromagnets 20 and 21 are restricted from moving in the radial direction. Further, a step 2 a (see FIG. 1) is formed in the housing 2 so that the diameter of the space in the housing 2 is smaller than the outer diameter of the electromagnets 20 and 21. When the upper and lower ends of the electromagnets 20 and 21 are in contact with the stepped portion 2a, the movement of the electromagnets 20 and 21 in the direction of the axis L1 is restricted.

  The lower electromagnet 21 corresponds to the first electromagnet, the discharge-side electromagnet, and the first magnet of the present invention. The upper electromagnet 20 corresponds to the second electromagnet and the second magnet of the present invention.

  As shown in FIG. 1, the fluid ejection device 1 includes an energization control unit 61 that controls energization of the electromagnetic coil 23. The energization control unit 61 is configured to be able to control the energization direction of the electromagnetic coil 23 for each of the electromagnets 20 and 21. Specifically, the coil terminals 29 of the electromagnets 20 and 21 are connected to the energization control unit 61 via a harness. The energization control unit 61 controls energization of the electromagnet 20 by controlling the voltage applied to the coil terminal 29 of the upper electromagnet 20, and controls the voltage applied to the coil terminal 29 of the lower electromagnet 21. 21 energization is controlled. The energization control unit 61 corresponds to the control unit of the present invention.

  The fluid ejection device 1 is not provided with a spring for moving the needle 10. That is, the needle 10 moves only by the magnetic force acting between the permanent magnet 16 and the electromagnets 20 and 21.

  The above is the configuration of the fluid ejection device 1. The fluid ejection device 1 receives the supply of hot melt adhesive from the fluid supply unit 62. The fluid supply unit 62 supplies the hot melt adhesive to the inlet 3 b formed in the seat block 3. The fluid supply unit 62 includes a heating unit that heats the raw material of the hot melt adhesive to a predetermined temperature (for example, about 150 ° C.), a pump that sends the hot melt adhesive in a heated state to the seat block 3, and a pump control unit that controls the pump. Etc.

  Further, the fluid ejection device 1 receives the supply of cooling air from the air supply unit 63. The air supply unit 63 supplies the cooling air to the inlet 13 a formed in the module body 13. The air supply unit 63 includes a compressor that compresses air and a pressure reducing valve that decompresses air compressed by the compressor, and includes a joint 300 (see FIG. 23) that connects the air of the compressor to the pressure reducing valve and the inlet 13a. To be supplied into the module body 13.

  Next, the operation of the fluid ejection device 1 will be described. The fluid ejection device 1 is applied in a situation where the material of the paper diaper flows under a nozzle 110 provided downstream of the ejection port 3a at a predetermined speed (for example, 300 m / min). In addition, the material of the paper diaper bonded together with an adhesive agent has a nonwoven fabric, PE film, tissue, thread rubber, etc. In addition, since materials to be bonded with an adhesive are used in a variety of appropriate places, there are a plurality of portions to be bonded. The fluid ejection device 1 applies a hot melt adhesive in a predetermined pattern (for example, every 5 mm interval) to a predetermined adhesion site in a paper diaper material by intermittently opening and closing the ejection port 3a. To do. The energization control unit 61 controls the energization direction of the electromagnets 20 and 21 so as to open and close the discharge port 3a intermittently.

  Specifically, the energization control unit 61 controls the energization direction of each electromagnetic coil 23 of the electromagnet 20 so that a repulsive force acts between the upper electromagnet 20 and the permanent magnet 16 when opening the discharge port 3a. To do. If the magnetic poles appearing on the upper surface 161 of the permanent magnet 16 are S poles on the outer side and N poles on the inner side as shown in FIG. 2, the S poles are generated in the outer magnetic pole part 24 of the electromagnet 20, and N The energization control unit 61 controls the energization direction of the electromagnetic coil 23 of the electromagnet 20 so that a pole is generated (see FIGS. 19 and 20). That is, the energization control unit 61 generates an S pole on the outer side of the electromagnetic coil 23 of the electromagnet 20 in the direction perpendicular to the needle axis L1, away from the needle axis L1, and on the inner side near the needle axis L1. The energizing direction of the electromagnetic coil 23 is controlled so that the N pole is generated. At this time, the magnetic flux forming the south pole generated outside the electromagnetic coil 23 is transmitted to the outer peripheral portion 223 of the magnetic core 22 and the outer magnetic pole portion 24 in contact therewith. As a result, an S pole is generated on the magnetic pole surface 24 a of the outer magnetic pole portion 24. On the other hand, the magnetic flux forming the N pole generated inside the electromagnetic coil 23 is transmitted to the inner peripheral portion 222, the central column 27, and the inner magnetic pole portion 25 of the magnetic core 22. As a result, an N pole is generated on the magnetic pole surface 25 a of the inner magnetic pole portion 25. The outer peripheral part 223 and the outer magnetic pole part 24 correspond to the first transmission part of the present invention. The inner peripheral part 222 and the inner magnetic pole part 25 correspond to the second transmission part of the present invention.

  As a result, a repulsive force is applied between the outer magnetic pole portion 24 of the upper electromagnet 20 and the outer portion 16d of the upper surface 161 of the permanent magnet 16, and the repulsive force is generated between the inner magnetic pole portion 25 and the inner portion 16e of the permanent magnet 16. Force can be applied. That is, a repulsive force can be applied between the electromagnet 20 and the permanent magnet 16.

  The energization control unit 61 controls the energization direction of the electromagnetic coil 23 of the electromagnet 21 so that an attractive force acts between the lower electromagnet 21 and the permanent magnet 16 when the discharge port 3a is opened. If the magnetic poles appearing on the lower surface 162 of the permanent magnet 16 are N poles on the outer side and S poles on the inner side as shown in FIG. 2, the S poles are generated in the outer magnetic pole part 24 of the electromagnet 21, and N The energization control unit 61 controls the energization direction of the electromagnetic coil 23 of the electromagnet 21 so that a pole is generated (see FIGS. 19 and 20). That is, the energization control unit 61 generates an S pole on the outer side of the electromagnetic coil 23 of the electromagnet 21 in the direction perpendicular to the needle axis L1 and away from the needle axis L1, and on the inner side near the needle axis L1. The energizing direction of the electromagnetic coil 23 is controlled so that the N pole is generated. At this time, the magnetic flux forming the south pole generated outside the electromagnetic coil 23 is transmitted to the outer peripheral portion 223 of the magnetic core 22 and the outer magnetic pole portion 24 in contact therewith. As a result, an S pole is generated on the magnetic pole surface 24 a of the outer magnetic pole portion 24. On the other hand, the magnetic flux forming the N pole generated inside the electromagnetic coil 23 is transmitted to the inner peripheral portion 222, the central column 27, and the inner magnetic pole portion 25 of the magnetic core 22. As a result, an N pole is generated on the magnetic pole surface 25 a of the inner magnetic pole portion 25.

  As a result, an attractive force is applied between the outer magnetic pole portion 24 of the lower electromagnet 21 and the outer portion 16 d of the lower surface 162 of the permanent magnet 16, and between the inner magnetic pole portion 25 and the inner portion 16 e of the permanent magnet 16. A suction force can be applied. That is, an attractive force can be applied between the electromagnet 21 and the permanent magnet 16.

  Thus, by applying a repulsive force between the upper electromagnet 20 and the permanent magnet 16 and an attractive force acting between the lower electromagnet 21 and the permanent magnet 16, the permanent magnet 16 is moved downward (upper side). The needle 10 can be moved downward in conjunction with this movement (see FIG. 20), in a direction away from the electromagnet 20 and a direction approaching the lower electromagnet 21. As the needle 10 moves downward, the tip 10a of the needle 10 opens the discharge port 3a. Accordingly, the hot melt adhesive is discharged from the discharge port 3a. The hot melt adhesive discharged from the discharge port 3a passes through the flow path 101 (see FIG. 1) formed in the body 100, and is then applied to the material from the nozzle 110.

  On the other hand, the energization control unit 61 controls the energization direction of the electromagnetic coil 23 of the electromagnet 20 so that an attractive force acts between the upper electromagnet 20 and the permanent magnet 16 when closing the discharge port 3a. Specifically, the energization control unit 61 controls the energization direction of the electromagnetic coil 23 of the electromagnet 20 so that the N pole is generated in the outer magnetic pole portion 24 and the S pole is generated in the inner magnetic pole portion 25 (FIG. 21, FIG. 21). 22). As a result, an attractive force is applied between the outer magnetic pole portion 24 of the upper electromagnet 20 and the outer portion 16 d of the upper surface 161 of the permanent magnet 16, and the attractive force is generated between the inner magnetic pole portion 25 and the inner portion 16 e of the permanent magnet 16. Force can be applied. That is, an attractive force can be applied between the electromagnet 20 and the permanent magnet 16.

  The energization control unit 61 controls the energization direction of the electromagnetic coil 23 of the electromagnet 21 so that a repulsive force acts between the lower electromagnet 21 and the permanent magnet 16 when closing the discharge port 3a. Specifically, the energization control unit 61 controls the energization direction of the electromagnetic coil 23 of the electromagnet 21 so that the N pole is generated in the outer magnetic pole portion 24 and the S pole is generated in the inner magnetic pole portion 25 (FIG. 21, FIG. 21). 22). As a result, a repulsive force acts between the outer magnetic pole portion 24 of the lower electromagnet 21 and the outer portion 16 d of the lower surface 162 of the permanent magnet 16, and between the inner magnetic pole portion 25 and the inner portion 16 e of the permanent magnet 16. A repulsive force can be applied. That is, a repulsive force can be applied between the electromagnet 21 and the permanent magnet 16.

  Thus, by applying an attractive force between the upper electromagnet 20 and the permanent magnet 16 and a repulsive force acting between the lower electromagnet 21 and the permanent magnet 16, the permanent magnet 16 is moved upward (upper side). The needle 10 can be moved upward in conjunction with this movement (see FIG. 22). As the needle 10 moves upward, the tip 10a of the needle 10 closes the discharge port 3a. Thereby, the discharge of the hot melt adhesive from the discharge port 3a is stopped, and the discharge of the hot melt adhesive from the nozzle 110 provided downstream of the discharge port 3a is also stopped.

  The energization control unit 61 energizes the electromagnets 20 and 21 so as to maintain the state of the lower limit position for a predetermined time after moving the needle 10 to the lower limit position when opening the discharge port 3a. To maintain the magnetic pole generation state of FIG. Similarly, when closing the discharge port 3a, the energization control unit 61 moves the needle 10 to the upper limit position, and then supplies the electromagnets 20 and 21 to the upper limit position for a predetermined time. The energization is continued to maintain the magnetic pole generation state of FIG. The energization control unit 61 drives the electromagnets 20 and 21 by, for example, a PWM (Pulse Width Modulation) method. That is, the energization control unit 61 causes a pulsed drive current to flow through the electromagnets 20 and 21. The energization control unit 61 always supplies a pulse signal to each of the electromagnets 20 and 21 when opening and closing the discharge port 3a (that is, there is no state of stopping the pulse signal). Heat generation of the electromagnets 20 and 21 can be suppressed by driving the electromagnets 20 and 21 by the PWM method and providing a timing at which the current instantaneously becomes zero. When the PWM method is used, control for creating an overexcitation state may be performed by applying a voltage higher than the steady application voltage at the start of operation when reversing the moving direction of the needle 10. By this control, when the reversing operation of the needle 10 is started, a strong magnetic field is generated in the electromagnets 20 and 21, and the responsiveness (agility) of the needle 10 can be enhanced.

  The energization control unit 61 switches the energization direction to the electromagnetic coil 23 (current direction around the central axis L3 of the magnetic core 22) in reverse every time a predetermined time elapses, thereby opening and closing the discharge port 3a at a predetermined time period. repeat.

  The fluid supply unit 62 in FIG. 1 continues to supply the hot melt adhesive to the sheet block 3. Note that the rotation speed of the pump mounted on the fluid supply unit 62 is synchronized with the speed of the disposable diaper production line, and automatically increases and decreases in proportion to the speed of the disposable diaper production line.

  Of course, the air supply unit 63 continues to supply air into the module body 13 while the heater of the body 100 is energized while the electromagnetic coil 23 is energized. The air supplied to the inlet 13a of the module body 13 flows into the space in the module body 13 after flowing through the ring-shaped groove 13b (see FIG. 23). The groove 13b functions to uniformly deliver the cooling air supplied from the inlet 13a to the ring-shaped gap between the permanent magnet 16 and the module body 13, and plays a role as a surge tank. . Further, by ensuring a uniform pressure in the groove 13b as a surge tank, when the cooling air is fed into the upper and lower ring-shaped slits (the gap between the permanent magnet 16 and the module body 13), the pressure is increased. Since air is pushed in, the groove 13b plays a role of a tank necessary to equalize the pressure and the flow rate. As shown by the arrows in FIG. 23, some of the air supplied into the module body 13 flows through the gap between the electromagnets 20 above the permanent magnets 16, and then the outlet 14 a (FIG. 1) of the head cover 14. (See below). A part of the air flows through the gap between the electromagnets 21 below the permanent magnets 16 and is then discharged from the window 6 formed by the base block 4 and the heat insulating block 5. Thereby, the heat generation of the electromagnets 20 and 21 can be suppressed.

  Hereinafter, the effect of this embodiment will be described. In the present embodiment, the electromagnets 20 and 21 are arranged on both upper and lower sides of the permanent magnet 16, and the needle 10 is formed using two sets of the permanent magnet 16 and the electromagnet 20 and the pair of the permanent magnet 16 and the electromagnet 21. Since it moves, the force which acts on the needle 10 can be enlarged compared with the case of only one set. In other words, both of the magnetic poles generated on both surfaces 161 and 162 of the permanent magnet 16 can contribute to the movement of the needle 10. Thereby, the time lag of the response of the needle 10 to the energization signals to the electromagnets 20 and 21 (opening and closing of the discharge port 3a) can be reduced, and the discharge port 3a can be opened and closed at high speed. Since the time lag can be reduced, the adhesive can be accurately discharged to the target position.

  In addition, since the electromagnets 20 and 21 are arranged on both the upper and lower sides of the permanent magnet 16, it is possible to suppress the energization amount per one electromagnet 20 and 21. Thereby, the heat generation of the electromagnets 20 and 21 can be suppressed.

  The electromagnetic coils 23 of the electromagnets 20 and 21 are wound around an axis L3 in a direction (radial direction) perpendicular to the needle axis L1, and the magnetic poles generated at both ends of the electromagnetic coil 23 are guided to the permanent magnet 16 side. Since the portions 24 and 25 are provided, the N pole and the S pole can be generated in the radial direction at a position facing the permanent magnet 16. Thereby, both the N pole and the S pole generated in the electromagnets 20 and 21 can contribute to the movement of the needle 10. That is, the energy used for energizing the electromagnets 20 and 21 can be effectively contributed to the movement of the needle 10. Thereby, the time lag of the response of the needle 10 to the energization signals to the electromagnets 20 and 21 (opening and closing of the discharge port 3a) can be reduced, and the discharge port 3a can be opened and closed at high speed.

  On the other hand, a configuration in which the needle is moved pneumatically, or only one electromagnet is provided above or below the permanent magnet, and the winding direction of the electromagnetic coil is a direction around the needle axis. In the configuration of Document 1, as the opening / closing speed of the discharge port increases, the time lag until the needle actually moves with respect to the electrical signal for moving the needle increases. FIG. 64 is a diagram showing air-driven responsiveness. As shown in FIG. 64, in the air drive type, thrust is generated for the piston (needle) only after the pressure in the cylinder rises after the start of air injection into the cylinder. Thereby, in an air drive type, the time lag until an actual needle moves will become large with respect to the electric signal for moving a needle. On the other hand, in the electromagnetic drive type of this embodiment, the thrust of the needle 10 is generated at the moment when a current is passed through the electromagnets 20 and 21.

  Further, in this embodiment, since the spring is not used to move the needle 10, it is possible to eliminate unintentional unnecessary vibrations such as surging of the spring from affecting the operation, and to ensure stability during high-speed operation. it can.

  In the present embodiment, since the needle 10 is moved using the permanent magnet 16, the needle 10 is more agile with respect to the magnetic field generated by the electromagnets 20 and 21 than when a magnetic material that is not a permanent magnet is used. Can be reacted.

  Further, in the present embodiment, the cooling air inlet 13a is formed only at one location, so that the structure of the fluid ejection device 1 can be simplified. In addition, since the ring-shaped groove 13b larger than the gap between the permanent magnet 16 and the inner wall is formed on the inner wall of the module body 13, the air injected from the inlet 13a is first moved along the groove 13b. It can flow in the circumferential direction. And since air is supplied in the module body 13 after flowing through the groove | channel 13b, air can be supplied uniformly in the circumferential direction.

  In the present embodiment, since the magnetization direction (magnetization direction) of the permanent magnet 16 is set in a direction parallel to the needle axis L1, the direction of the magnetic lines of force from the permanent magnet 16 is matched with the moving direction of the needle 10. be able to. Thereby, the needle 10 can be easily moved.

  Further, since the magnetic poles of both surfaces 161 and 162 of the permanent magnet 16 are reversed, even if the energization direction of the upper electromagnet 20 and the energization direction of the lower electromagnet 21 are the same direction, the upper electromagnet 20 and the permanent magnet One of the force acting between the lower electromagnet 21 and the permanent magnet 16 and the other acting as a repulsive force can be made into a relationship of attraction force. That is, since the energization direction can be made the same between the upper electromagnet 20 and the lower electromagnet 21, the energization control of the electromagnets 20 and 21 can be simplified.

  Further, since the permanent magnet 16 is set to have the same magnetic pole in the circumferential direction, the boundary portion (neutral point) between the N pole and the S pole can be reduced on both surfaces 161 and 162. Although the boundary portion has a weak magnetic force, by reducing the boundary portion, it is possible to suppress the magnetic force from being weakened as the entire surfaces 161 and 162.

  In addition, since the electromagnets 20 and 21 are divided into a plurality of magnetic cores 22 connected by a central support column 27, a coil cover 28, a nut 31 and the like, between the divided magnetic cores 22 and electromagnetic coils 23. With this gap, the heat storage action of the electromagnetic coil 23 can be reduced, and the heat radiation area can be increased. Further, the cooling air can flow through the gap, and the contact area between the magnetic core 22 and the electromagnetic coil 23 and the cooling air can be increased. Thereby, the heat_generation | fever by the electricity supply to the electromagnetic coil 23 can be suppressed effectively, and it can suppress that the resistance of the electromagnetic coil 23 increases and the function as an electromagnet falls by the heat_generation | fever. In particular, when the needle 10 is intermittently reciprocated at a high speed, the electromagnetic coil 23 tends to generate heat, but this heat generation can be effectively suppressed.

  Further, as shown in FIGS. 9 and 10, the electromagnetic coil 23 is wound so that the number of turns decreases as it goes radially inward, so that when the six electromagnetic coils 23 are combined, the adjacent electromagnetic coils The gap between 23 can be appropriately sized (the formation of an extra space can be suppressed). Thereby, the cooling air can be circulated in the gap while suppressing the stagnation, and the cooling efficiency of the electromagnetic coil 23 can be improved.

  Further, the magnetic coil 22 can be easily wound around the magnetic core 22 by making the magnetic core 22 into a divided structure.

  In addition, by setting the number of divisions of the magnetic core 22 to 6 divisions per one electromagnet 20 and 21, the number of turns of the electromagnetic coil 23 per one magnetic core 22 can be set to an appropriate value. That is, if the number of divisions of the magnetic core 22 is too large, the number of turns of the electromagnetic coil 23 per magnetic core 22 becomes too small and the magnetic force becomes weak. On the other hand, if the number of divisions of the magnetic core 22 is too small, the number of turns of the electromagnetic coil 23 per magnetic core 22 becomes excessive, and the electromagnetic coil 23 on the inner side (side closer to the central axis L3 of the magnetic core 22) is cooled. It becomes difficult. By setting the number of divisions of the magnetic core 22 to six, it is possible to generate an appropriate magnitude of magnetic force and to configure the electromagnets 20 and 21 that are easy to cool.

  Further, since the interval between the outer magnetic pole portion 24 and the inner magnetic pole portion 25 is larger than the interval between the magnetic pole surfaces 24a and 25a of the magnetic pole portions 24 and 25 and the permanent magnet 16, the gap between the magnetic pole portions 24 and 25 is reduced. The action of the magnetic force between the magnetic pole portions 24 and 25 and the permanent magnet 16 can be prioritized over the action of the magnetic force. Thereby, an attractive force or a repulsive force can be easily applied between the electromagnets 20 and 21 and the permanent magnet 16.

  Further, since the cooling air inlet 13 a is formed at the position of the permanent magnet 16, cold air can be supplied to both the electromagnets 20 and 21. Thereby, the electromagnets 20 and 21 can be cooled effectively.

  In addition, the hot melt adhesive inlet 3b is provided on the lower side (discharge port 3a side) of the lower electromagnet 21, and the sheet block 3 to which the hot melt adhesive is supplied is provided with magnets 16, 20, 21. Since it is provided in the position away from the module body 13 in which is disposed, heat from the seat block 3 can be suppressed from being transmitted to the module body 13. Thereby, the temperature rise of the electromagnets 20 and 21 can be suppressed.

  Furthermore, since the heat insulating block 5 made of a material having low thermal conductivity is provided between the seat block 3 and the module body 13, the heat from the seat block 3 is prevented from being transmitted to the module body 13. it can. Thereby, the temperature rise of the electromagnets 20 and 21 can be suppressed.

  Further, since the tip 10a of the needle 10 is provided outside the discharge port 3a, the needle 10 moves upward when the discharge port 3a is closed, so that the flow channel 101 downstream of the discharge port 3a (see FIG. 1). ) Can be negative pressure. With this negative pressure, the hot melt adhesive in the flow channel 101 and the nozzle 110 ahead can be pulled up, and the blocking property of the hot melt adhesive from the nozzle 110 can be improved.

(Second Embodiment)
The second embodiment of the present invention will be described focusing on the differences from the above embodiment. FIG. 24 shows a cross-sectional view of the fluid ejection device 200 of the present embodiment. In FIG. 24, the same members as those in the first embodiment are denoted by the same reference numerals. The fluid ejection device 200 is different from the first embodiment in the configuration of the electromagnets 33 and 34, and is otherwise the same as that in the first embodiment.

  As shown in FIG. 25, the electromagnets 33 and 34 include a magnetic core 35 formed of a magnetic material such as permalloy and an electromagnetic coil 36 wound around the magnetic core 35. The magnetic core 35 is formed in a rod shape, and is provided such that its axis L4 is parallel to the needle axis L1. The magnetic core 35 is formed in a shape having the same diameter at any position along the direction of the axis L4 (that is, the diameter does not change along the direction of the axis L4). Further, as shown in FIG. 26, six magnetic cores 35 are provided at equal intervals in the circumferential direction around the position O of the needle axis L1. That is, the magnetic cores 35 are provided at 60 ° intervals in the circumferential direction. Further, the distance between the magnetic core 35 and the center O is the same among the six magnetic cores 35.

  The electromagnetic coil 36 is wound around the axis L <b> 4 of the magnetic core 35 in the magnetic core 35. At this time, the electromagnetic coil 36 is provided so as to have the same number of turns at any position along the axis L4 direction of the magnetic core 35 (that is, the number of turns does not change along the direction of the axis L4). Moreover, the electromagnetic coil 36 is provided for every magnetic core 35 (refer FIG. 25, FIG. 27). The winding direction of each electromagnetic coil 36 is the same.

  At the end of the magnetic core 35 on the side where the permanent magnet 16 (see FIG. 24) is disposed, a magnetic seat 37 is provided as an integral part of the magnetic core 35. The seat portion 37 has a structure that is divided into six sectors in a plan view shown in FIG. One magnetic core 35 is provided upright on one divided seat portion 37. The six seats 37 are provided so as to form a ring shape as a whole by being arranged in the circumferential direction with the center O as the center.

  An outer magnetic pole portion 38 made of a magnetic material is provided as an integral part of the magnetic core 35 and the seat portion 37 on the side opposite to the side where the magnetic core 35 is provided. The outer magnetic pole portion 38 is provided for each seat portion 37, and the six outer magnetic pole portions 38 are combined so that the outer magnetic pole portion 38 is similar to the outer portion 16 d at a position facing the outer portion 16 d (see FIG. 2) of the permanent magnet 16. A magnetic pole surface 38a having a shape (ring shape) is formed. The seat portion 37 and the outer magnetic pole portion 38 are divided into six according to the number of divisions of the magnetic core 35, but may not be divided.

  The opposite end 35 a of the magnetic core 35 where the seat 37 is provided is provided so as to protrude from the end face of the electromagnetic coil 36.

  On the opposite side of the magnetic core 35 where the seat portion 37 is provided, a connecting plate 41 of a magnetic material (permalloy or the like) is provided. 30 and 31 show a first shape example of the connecting plate 41 (hereinafter referred to as the first connecting plate 41a). 32 and 33 show a second shape example of the connecting plate 41 (hereinafter referred to as a second connecting plate 41b). 34 and 35 show a third shape example of the connecting plate 41 (hereinafter referred to as a third connecting plate 41c).

  Each of the first to third connection plates 41a, 41b, 41c is formed with a recess 411 into which an end 35a of each magnetic core 35 is fitted, and a center hole 412 into which a later-described center column 40 is inserted. The shape of the recess 411 is slightly different between the first to third connection plates 41a, 41b, 41c. Specifically, the concave portion 411 of the first connecting plate 41a has a shape in which the entire periphery is closed when seen in a plan view of FIG. The concave portion 411 of the second connection plate 41b has a shape in which the inner side is opened as viewed in a plan view of FIG. The concave portion 411 of the third connecting plate 41c has a shape that is open on the outside as viewed in a plan view of FIG.

  The central hole 412 of the connection plate 41 is formed in a circular shape having the same diameter as the central support column 40. That is, at the position of the center hole 412, the connecting plate 41 and the center column 40 are in contact (conducting in terms of magnetic circuit). Further, the end portion 35a of the magnetic core 35 is fitted into the concave portion 411, whereby the connecting plate 41 and each magnetic core 35 are electrically connected in a magnetic circuit manner.

  A resin coil cover 42 is provided between the coupling plate 41 and the end face of the electromagnetic coil 36. The coil cover 42 is a member that holds the magnetic core 35 and the electromagnetic coil 36 that are divided into six pieces so as not to fall apart.

  Further, as shown in FIGS. 28 and 29, a resin air guide cover 49 is provided so as to fill an extra gap formed between the six electromagnetic coils. The air guide cover 49 includes an inner portion 491 provided to fill an extra space formed on the inner peripheral side of the six electromagnetic coils 36, and an extra gap formed on the outer peripheral side of the six electromagnetic coils 36. And an outer portion 492 provided so as to be buried. The extra space formed between the electromagnetic coils 36 is filled by the air guide cover 49 (the inner portion 491 and the outer portion 492), so that the cooling air supplied to the electromagnets 33 and 34 is exchanged between the electromagnetic coils 36. It is possible to circulate without gaps in the gap, and the cooling efficiency of the electromagnetic coil 36 can be improved.

  In the space inside the six magnetic cores 35 and the electromagnetic coil 36, a central support column 40 of a magnetic material (permalloy or the like) is provided. The center column 40 is formed in a cylindrical shape, and is provided so that its center axis coincides with the needle axis L1. The center column 40 has a protrusion 40 a that is inserted into the center hole 412 of the connection plate 41 and protrudes from the center hole 412 to the side opposite to the side where the magnetic core 35 is provided. A groove 40b is formed on the outer peripheral surface of the protrusion 40a. A snap ring 400 (C-shaped retaining ring) is provided in the groove 40b. Furthermore, a spring 401 such as a wave ring and a washer 402 are provided so as to be inserted into the protruding portion 40a. The washer 402 is provided so as to be sandwiched between the snap ring 400 and the spring 401, that is, one end surface of the washer 402 is in contact with the end surface of the snap ring 401 and the other end surface is in contact with the end surface of the spring 401. . The spring 401 is provided so as to be sandwiched between the washer 402 and the connecting plate 41 in a compressed state. That is, the spring 401 is provided in a state where pressure is applied to the snap ring 400 via the washer 402. The snap ring 400, the spring 401, and the washer 402 fix the members constituting the electromagnets 33 and 34 so that they do not fall apart.

  An inner magnetic pole portion 39 of a magnetic material (permalloy or the like) is provided as an integral part of the central column 40 on the opposite side of the central column 40 where the protruding portion 40 a is provided. The inner magnetic pole portion 39 is formed in a ring shape coaxial with the central support column 40 and is provided at a position inside the outer magnetic pole portion 38 and spaced from the outer magnetic pole portion 38. The interval between the outer magnetic pole portion 38 and the inner magnetic pole portion 39 is the interval between the permanent magnet 16 and the magnetic pole surfaces 38a and 39a (the interval when the movable permanent magnet 16 is located farthest from the magnetic pole surfaces 38a and 39a). Bigger than). Further, the inner magnetic pole portion 39 forms a magnetic pole surface 39a having the same shape (ring shape) as the inner portion 16e at a position facing the inner portion 16e (see FIG. 2) of the permanent magnet 16.

  Between the outer magnetic pole part 38 and the inner magnetic pole part 39, a magnetic pole separator 44 for magnetically separating the magnetic pole parts 38, 39 is provided. The inter-magnetic pole separator 44 is formed of a non-magnetic material (resin, metal such as phosphor bronze). The inter-magnetic pole separator 44 is formed in a cylindrical shape, and is provided so that its central axis coincides with the needle axis L1. At this time, the outer peripheral surface of the inter-magnetic pole separator 44 is in contact with the inner peripheral surface of the outer magnetic pole portion 38. The inner peripheral surface of the intermagnetic pole separator 44 is in contact with the outer peripheral surface of the inner magnetic pole portion 39. The inter-magnetic pole separator 44 is formed so as not to restrict the flow of the cooling air, and is preferably formed so as to produce a rectifying effect of the cooling air.

  A nonmagnetic outer magnetic pole holder 43 is provided outside the outer magnetic pole portion 38. The outer magnetic pole holder 43 holds the six divided outer magnetic pole portions 38 and the magnetic core 35 and the seat portion 37 integrated therewith so as not to fall apart.

  Further, the electromagnets 33 and 34 are configured so that the coil terminal 46 composed of a first terminal connected to one end of each electromagnetic coil 36 and a second terminal connected to the other end and the base side of the coil terminal 46 are not exposed. It has a terminal cover 45 to cover and a lead case 47 for receiving a lead drawn from each electromagnetic coil 36 and connected to the coil terminal 46. The terminal cover 45 and the conductor case 47 are made of resin.

  The electromagnets 33 and 34 are provided so that the needle 10 is inserted inside the center column 40. At this time, the upper electromagnet 33 is provided so that the magnetic pole surfaces 38 a and 39 a face the upper surface 161 of the permanent magnet 16. The lower electromagnet 34 is provided so that the magnetic pole surfaces 38 a and 39 a face the lower surface 162 of the permanent magnet 16.

  When opening the discharge port 3 a, the energization controller 61 generates the same magnetic pole as the outer portion 16 d of the permanent magnet 16 on the magnetic pole surface 38 a of the outer magnetic pole portion 38 of the upper electromagnet 33, and the inner magnetic pole of the upper electromagnet 33. The same magnetic pole as the inner portion 16e of the permanent magnet 16 is generated on the magnetic pole surface 39a of the portion 39, the outer portion 16d of the permanent magnet 16 and the opposite magnetic pole are generated on the magnetic pole surface 38a of the outer magnetic pole portion 38 of the lower electromagnet 34, The electromagnetic coil 36 of the upper electromagnet 33 and the electromagnetic coil 36 of the lower electromagnet 34 are arranged so that a magnetic pole opposite to the inner portion 16e of the permanent magnet 16 is generated on the magnetic pole surface 39a of the inner magnetic pole portion 39 of the lower electromagnet 34. Control energization direction. At this time, the magnetic pole (magnetic flux) generated on one end side (permanent magnet 16 side) of the magnetic core 35 is transmitted to the magnetic pole surface 38 a of the outer magnetic pole portion 38 via the seat portion 37. The magnetic pole (magnetic flux) generated on the other end side (the side opposite to the permanent magnet 16) of the magnetic core 35 is transmitted to the magnetic pole surface 39 a of the inner magnetic pole portion 39 through the connection plate 41 and the central column 40.

  As a result, a repulsive force acts between the upper electromagnet 33 and the permanent magnet 16, and an attractive force acts between the lower electromagnet 34 and the permanent magnet 16. Therefore, the permanent magnet 16 and the needle 10 connected thereto. Can be moved in the direction of opening the discharge port 3a.

  When closing the discharge port 3a, the energization control unit 61 switches back from the energization direction when opening the discharge port 3a. As a result, an attractive force acts between the upper electromagnet 33 and the permanent magnet 16 and a repulsive force acts between the lower electromagnet 34 and the permanent magnet 16. Therefore, the permanent magnet 16 and the needle 10 connected to the permanent magnet 16. Can be moved in the direction of closing the discharge port 3a.

  Thus, in this embodiment, in addition to obtaining the same effect as in the first embodiment, it is not necessary to change the number of turns of the electromagnetic coil 36 along the direction of the axis L4 of the magnetic core 35. The shape can be simplified and the electromagnetic coil 36 can be easily wound around the magnetic core 35.

  In the present embodiment, the lower electromagnet 34 corresponds to the first electromagnet and the first magnet of the present invention. The upper electromagnet 33 corresponds to the second electromagnet and the second magnet of the present invention. The seat portion 37 and the outer magnetic pole portion 38 correspond to the first transmission portion. The connecting plate 41, the center column 40, and the inner magnetic pole part 39 correspond to the second transmission part.

(Third embodiment)
The third embodiment of the present invention will be described with a focus on the differences from the above embodiment. In the present embodiment, the configuration of the permanent magnet, the configuration of the electromagnet, and the energization control of the electromagnet are different from those in the first and second embodiments, and the other configurations are the same as those in the first and second embodiments.

  In the present embodiment, a permanent magnet 48 of FIG. 36 is arranged instead of the permanent magnet 16 of FIG. The permanent magnet 48 is formed in the same shape (that is, a disk shape) as that of the first embodiment, but the magnetic poles appearing on the respective surfaces 481 and 482 are different from those of the first embodiment. Specifically, in the permanent magnet 48, opposite magnetic poles appear between the radial outer portion 48a and the inner portion 48b that are perpendicular to the needle axis L1 on each of the surfaces 481 and 482 (that is, along the radial direction). Both N pole and S pole appear). In addition, the permanent magnet 48 is configured such that N poles and S poles are alternately arranged at intervals of 60 ° along the circumferential direction around the axis L1 in each of the outer portion 48a and the inner portion 48b. The Further, the permanent magnet 48 is configured such that a reverse magnetic pole appears between the upper surface 481 and the lower surface 482. That is, the portion of the lower surface 482 opposite to the N pole portion of the upper surface 481 is set to the S pole, and the portion of the lower surface 482 opposite to the S pole portion of the upper surface 481 is set to the N pole. Further, the magnetization direction of the permanent magnet 48 is set in a direction parallel to the needle axis L1.

  The permanent magnet 48 shown in FIG. 36 is obtained by preparing a disk body made of a magnetic material such as neodymium and magnetizing the disk body with a magnetizing yoke so as to have the magnetic pole arrangement shown in FIG. The magnetization direction of the disc body by the magnetizing yoke is set in a direction parallel to the axis L1 as described above.

  Moreover, in this embodiment, it replaces with the electromagnets 20 and 21 of FIG. 1, and the electromagnets 51 and 52 of FIG. 37 are arrange | positioned. In FIG. 37, the illustration of the electromagnetic coil 60 (see FIGS. 38 and 39), coil terminals, and the like is omitted. The electromagnets 51 and 52 include a magnetic core 53 and an electromagnetic coil 60 (see FIGS. 38 and 39) wound around the magnetic core 53.

  The magnetic core 53 is made of a magnetic material such as permalloy. As shown in FIGS. 38 and 39, the magnetic core 53 is formed in the same shape as the magnetic core 22 of the first embodiment. That is, the magnetic core 53 is divided into six in the circumferential direction around the position O of the needle axis L1 (see FIG. 40), and each magnetic core 53 has a shaft portion 531, an inner peripheral portion 532, and an outer peripheral portion 533. . The shaft portion 531 is formed in the same shape as the shaft portion 221 of the first embodiment. The inner peripheral part 532 is formed in the same shape as the inner peripheral part 222 of the first embodiment. The outer peripheral part 533 is formed in the same shape as the outer peripheral part 223 of the first embodiment.

  Each of the magnetic cores 53 divided into six is provided so as not to exchange magnetism between the magnetic cores 53. That is, as shown in FIG. 40, the six magnetic cores 53 are provided at intervals. That is, a gap is provided between the inner peripheral portions 532 of the adjacent magnetic cores 53. A gap is provided between the outer peripheral portions 533 of the adjacent magnetic cores 53.

  The six magnetic cores 53 are held in the positional relationship shown in FIG. 40 by the resin upper surface fixing cover 55 (see FIGS. 37 and 51 to 53) and the lower surface fixing cover 56 (see FIGS. 37 and 54 to 56). Has been. The upper surface fixing cover 55 is provided so as to fix the end portion of the magnetic core 53 opposite to the side where the magnetic pole portions 57 and 58 are provided in the direction parallel to the needle axis L1. The lower surface fixing cover 56 is provided so as to fix the end of the magnetic core 53 on the side where the magnetic pole portions 57 and 58 are provided in the direction parallel to the needle axis L1.

  The electromagnetic coil 60 is wound around each of the divided magnetic cores 53. At this time, similarly to the first embodiment, the electromagnetic coil 60 is wound such that the number of turns decreases from the outer peripheral portion 533 to the inner peripheral portion 532 of the magnetic core 53. Furthermore, the electromagnetic coil 60 is wound so that the winding direction is reversed between adjacent electromagnetic coils 60.

  The electromagnets 51 and 52 have a central support 54 formed of a nonmagnetic material such as phosphor bronze (see FIGS. 37 and 41). The center column 54 is formed in a cylindrical shape, and is provided so that its center axis coincides with the needle axis L1. That is, the center column 54 is provided so as to be inserted into the center hole formed by the inner peripheral portions 532 of the six magnetic cores 53. At this time, the outer peripheral surface of the central column 54 and each inner peripheral part 532 come into contact with each other, but since the central column 54 is formed of a nonmagnetic material, the flow of magnetism between the magnetic cores 53 is interrupted. Further, a screw groove is formed on the outer peripheral surface of the end portion 54a of the center column 54 opposite to the side where the magnetic pole portions 57 and 58 are provided. By fitting this screw groove with a nut 65 formed of a non-magnetic material (phosphor bronze or the like), each member constituting the electromagnets 51 and 52 is held so as not to fall apart. Instead of fixing with the nut 65, the snap ring method may be used as shown in FIG. 25 of the second embodiment.

  The electromagnets 51 and 52 each have an outer magnetic pole portion 57 and an inner magnetic pole portion 58 formed of a magnetic material such as permalloy. As shown in FIG. 42, the magnetic pole portions 57 and 58 have a structure divided into six pieces in the circumferential direction around the position O of the needle axis L1. Each of the outer magnetic pole portions 57 is formed in the shape shown in FIGS. 43 to 46, and by combining six of the outer magnetic pole portions 57, a circle centered on the needle axis L <b> 1 is formed at a position facing the outer portion 48 a of the permanent magnet 48. The magnetic pole surface 57a (see FIG. 37) divided into six in the circumferential direction is provided. That is, the outer magnetic pole part 57 is formed in an arc shape when viewed in a plan view of FIG. 42 and is arranged in the circumferential direction with the center O as the center. At this time, the adjacent outer magnetic pole portions 57 are provided at intervals so as not to contact each other. That is, the six outer magnetic pole portions 57 are magnetically separated.

  Further, the outer magnetic pole portions 57 are provided at the same intervals as the arrangement intervals of the six magnetic cores 53 in the circumferential direction. In other words, the first outer magnetic pole portion 57 is provided at a position facing the first magnetic core 53 (a position facing the direction parallel to the needle axis L 1), and the second outer magnetic pole portion 57 is disposed at the second magnetic core 53. The third outer magnetic pole portion 57 is provided at a position facing the third magnetic core 53, the fourth outer magnetic pole portion 57 is provided at a position facing the fourth magnetic core 53, and The fifth outer magnetic pole portion 57 is provided at a position facing the fifth magnetic core 53, and the sixth outer magnetic pole portion 57 is provided at a position facing the sixth magnetic core 53. And each outer magnetic pole part 57 is connected to the outer peripheral part 533 of the magnetic core 53 in the position which opposes the direction parallel to the needle axis L1, and is provided so that magnetic conduction is possible between this outer peripheral part 533. The outer magnetic pole portion 57 is connected to one end of the outer peripheral portion 533 of the magnetic core 53 in the direction parallel to the needle axis L1.

  The inner magnetic pole part 58 is formed in the shape shown in FIGS. 47 to 50, and by combining six, the circumference around the needle axis L1 is located at a position facing the inner part 48b of the permanent magnet 48. A magnetic pole surface 58a (see FIG. 37) divided in six directions is provided. That is, the inner magnetic pole portions 58 are formed in an arc shape when viewed in a plan view of FIG. 42 and are arranged in the circumferential direction with the center O as the center. At this time, the inner magnetic pole portions 58 adjacent to each other are provided at intervals so as not to contact each other. That is, the six inner magnetic pole portions 58 are magnetically separated. Each inner magnetic pole part 58 is provided at a position on the inner side (center O side) of the outer magnetic pole part 57 and spaced from the outer magnetic pole part 57. That is, the inner magnetic pole part 58 and the outer magnetic pole part 57 are magnetically separated.

  The inner magnetic pole portions 58 are provided at the same intervals as the arrangement intervals of the six magnetic cores 53 in the circumferential direction. In other words, the first inner magnetic pole portion 58 is provided at a position facing the first magnetic core 53 (a position facing the direction parallel to the needle axis L 1), and the second inner magnetic pole portion 58 is disposed at the second magnetic core 53. The third inner magnetic pole portion 58 is provided at a position facing the third magnetic core 53, the fourth inner magnetic pole portion 58 is provided at a position facing the fourth magnetic core 53, and The fifth inner magnetic pole portion 58 is provided at a position facing the fifth magnetic core 53, and the sixth inner magnetic pole portion 58 is provided at a position facing the sixth magnetic core 53. Each inner magnetic pole portion 58 is connected to the inner peripheral portion 532 of the magnetic core 53 at a position facing in the direction parallel to the needle axis L1 and is provided so as to be magnetically conductive with the inner peripheral portion 532. The inner magnetic pole part 58 is connected to one end of the inner peripheral part 532 of the magnetic core 53 in the direction parallel to the needle axis L1.

  The outer magnetic pole part 57 and the inner magnetic pole part 58 are held at specified positions by a magnetic pole separator 59 (see FIGS. 57 to 59) formed of a nonmagnetic material such as phosphor bronze. That is, the outer magnetic pole part 57 maintains a state where the outer magnetic pole part 57 is arranged at intervals in the circumferential direction as shown in FIG. The state of being arranged with a space between the magnetic pole part 58 is maintained. Similarly, the inner magnetic pole part 58 maintains a state in which the inner magnetic pole part 58 is arranged at intervals in the circumferential direction as shown in FIG. 42 by the inter-magnetic pole separator 59 and keeps a state in contact with the inner peripheral part 532 of the magnetic core 53. The state of being arranged with a space from the outer magnetic pole part 57 is maintained. Further, the inter-magnetic pole separator 59 has a portion arranged so as to be filled in a gap formed between the outer magnetic pole part 57 and the inner magnetic pole part 58. The distance between the outer magnetic pole part 57 and the inner magnetic pole part 58 is the distance between the permanent magnet 48 and the magnetic pole faces 57a, 58a of the magnetic pole parts 57, 58 (the position where the movable permanent magnet 48 is farthest from the magnetic pole face). Larger than a certain interval).

  The electromagnets 51 and 52 are provided so that the needle 10 is inserted inside the center column 54. At this time, the upper electromagnet 51 is provided so that the magnetic pole surfaces 57 a and 58 a face the upper surface 481 of the permanent magnet 48. The lower electromagnet 52 is provided so that the magnetic pole surfaces 57 a and 58 a face the lower surface 482 of the permanent magnet 48.

  The energization control unit 61 in FIG. 1 controls the energization direction of the electromagnetic coil 60 of the electromagnet 51 so that a repulsive force acts between the upper electromagnet 51 and the permanent magnet 48 when the discharge port 3a is opened. . Specifically, among the six magnetic pole surfaces 57a outside the electromagnet 51, the N pole appears in the portion facing the N pole of the outer portion 48a of the permanent magnet 48, and faces the S pole of the outer portion 48a of the permanent magnet 48. The S pole appears in the portion where the N pole is present, and the N pole appears in the portion of the magnetic pole surface 58a inside the electromagnet 51 that faces the N pole of the inner portion 48b of the permanent magnet 48, and faces the S pole of the inner portion 48b. The energization direction of the electromagnetic coil 60 of the electromagnet 51 is controlled so that the S pole appears in the portion. That is, as shown in FIG. 60, the energization control unit 61 reverses the energization direction between the adjacent electromagnetic coils 60, so that the outer magnetic pole surface 57 a has N at 60 ° intervals along the circumferential direction. The poles and the S poles are alternately arranged, and on the inner magnetic pole face 58a, the N poles and the S poles are alternately arranged at intervals of 60 ° along the circumferential direction, which are opposite to the outer magnetic pole face 57a. In addition, since the winding direction of the electromagnetic coil 60 is reversed between the adjacent electromagnetic coils 60, even if a common coil terminal is used among the six electromagnetic coils 60, the adjacent electromagnetic coils 60 are not connected. The energization direction can be reversed.

  The energization control unit 61 controls the energization direction of the electromagnetic coil 60 of the electromagnet 52 so that an attractive force acts between the lower electromagnet 52 and the permanent magnet 48 when opening the discharge port 3a. Specifically, of the six magnetic pole surfaces 57a outside the electromagnet 52, the S pole appears in the portion facing the N pole of the outer portion 48a of the permanent magnet 48, and faces the S pole of the outer portion 48a of the permanent magnet 48. The N pole appears in the part where the S pole is present, and the S pole appears in the part of the magnetic pole surface 58a inside the electromagnet 52 that faces the N pole of the inner part 48b of the permanent magnet 48, and faces the S pole of the inner part 48b. The energization direction of the electromagnetic coil 60 of the electromagnet 52 is controlled so that the N pole appears in the portion. That is, as shown in FIG. 60, the energization control unit 61 reverses the energization direction between the adjacent electromagnetic coils 60, so that the outer magnetic pole surface 57 a has N at 60 ° intervals along the circumferential direction. The poles and the S poles are alternately arranged, and on the inner magnetic pole face 58a, the N poles and the S poles are alternately arranged at intervals of 60 ° along the circumferential direction, which are opposite to the outer magnetic pole face 57a.

  When the electromagnetic coil 60 is energized, the magnetic pole (magnetic flux) generated at the outer end portion of the shaft portion 531 of the magnetic core 53 reaches the magnetic pole surface 57 a of the outer magnetic pole portion 57 via the outer peripheral portion 533 of the magnetic core 53. Communicated. The magnetic pole (magnetic flux) generated at the inner end of the shaft portion 531 of the magnetic core 53 is transmitted to the magnetic pole surface 58 a of the inner magnetic pole portion 58 via the inner peripheral portion 532 of the magnetic core 53.

  In this way, a repulsive force is applied between the upper electromagnet 51 and the permanent magnet 48 and an attractive force is applied between the lower electromagnet 52 and the permanent magnet 48 to move the permanent magnet 48 downward. The discharge port 3a can be opened.

  On the other hand, when the discharge port 3a is closed, the energization control unit 61 switches the energization direction of the electromagnetic coil 60 of the upper electromagnet 51 from the energization direction when the discharge port 3a is opened, and the lower electromagnet. The energizing direction of the 52 electromagnetic coils 60 is switched from the energizing direction when the discharge port 3a is opened. That is, of the six magnetic pole surfaces 57 a outside the upper electromagnet 51, the S pole appears in the portion facing the N pole of the outer portion 48 a of the permanent magnet 48 and the S pole of the outer portion 48 a of the permanent magnet 48. An N pole appears in the facing portion, and an S pole appears in a portion of the magnetic pole surface 58a inside the electromagnet 51 that faces the N pole of the inner portion 48b of the permanent magnet 48, and faces the S pole of the inner portion 48b. The energization direction of the electromagnetic coil 60 of the electromagnet 51 is controlled so that the N pole appears in the portion to be performed. In the energization control unit 61, the N pole appears in the portion of the six magnetic pole surfaces 57 a outside the lower electromagnet 52 facing the N pole of the outer portion 48 a of the permanent magnet 48, and the outer portion of the permanent magnet 48. An S pole appears at a portion of the inner side 48b of the permanent magnet 48, and an N pole appears at a portion of the inner surface 48b of the permanent magnet 48 that faces the N pole. The energization direction of the electromagnetic coil 60 of the electromagnet 51 is controlled so that the S pole appears in the portion facing the S pole.

  Accordingly, an attractive force can be applied between the upper electromagnet 51 and the permanent magnet 48, and a repulsive force can be applied between the lower electromagnet 52 and the permanent magnet 48, and the needle 10 is moved upward. The discharge port 3a can be closed.

  Thus, in this embodiment, in addition to the effects of the first and second embodiments, the following effects are achieved. That is, the permanent magnet 48 is configured such that the N pole and the S pole are alternately arranged in the circumferential direction, and the electromagnets 51 and 52 are controlled so that the N pole and the S pole are alternately arranged in the circumferential direction. Therefore, it can suppress that the permanent magnet 48 and the needle 10 fixed to this rotate around the axis line L1. That is, when the discharge port 3a is opened, an attractive force acts between the lower electromagnet 52 and the permanent magnet 48. The N pole portion of the lower surface 482 of the permanent magnet 48, the N pole portion and the circumference The magnetic pole (N pole) of the electromagnet 52 at the position adjacent to the direction has the same magnetic pole relationship. Similarly, the S pole portion of the lower surface 482 of the permanent magnet 48 and the magnetic pole (S pole) of the electromagnet 52 at a position adjacent to the S pole portion in the circumferential direction have the same magnetic pole relationship. This restricts the movement of the permanent magnet 48 in the rotational direction.

  In closing the discharge port 3a, an attractive force acts between the upper electromagnet 51 and the permanent magnet 48. The N pole portion of the upper surface 481 of the permanent magnet 48, the N pole portion and the circumferential direction The magnetic poles (N poles) of the electromagnet 51 at the positions adjacent to each other are in the same magnetic pole relationship. Similarly, the S pole portion of the upper surface 481 of the permanent magnet 48 and the magnetic pole (S pole) of the electromagnet 51 at a position adjacent to the S pole portion in the circumferential direction have the same magnetic pole relationship. This restricts the movement of the permanent magnet 48 in the rotational direction.

  In the present embodiment, the outer portion 48a of the permanent magnet 48 corresponds to the first magnetic pole portion of the present invention. The inner part 48b corresponds to the second magnetic pole part. The lower electromagnet 52 corresponds to a first electromagnet and a first magnet. The upper electromagnet 51 corresponds to a second electromagnet and a second magnet. The outer peripheral portion 533 and the outer magnetic pole portion 57 of the magnetic core 53 correspond to the first transmission portion. The inner peripheral part 532 and the inner magnetic pole part 58 of the magnetic core 53 correspond to a second transmission part.

(Fourth embodiment)
The fourth embodiment of the present invention will be described focusing on the differences from the above embodiment. In the present embodiment, the configuration of the electromagnet is different from that of the first and second embodiments, and the other configuration is the same as that of the first and second embodiments. The fluid ejection device of the present embodiment is the same as FIG. 1 except that electromagnets 71 and 72 of FIG. 61 are provided instead of the electromagnets 20 and 21 of FIG.

  The electromagnets 71 and 72 have a magnetic core 73 and an electromagnetic coil 74 wound around the magnetic core 73. The magnetic core 73 is made of a magnetic material such as permalloy. The magnetic core 73 is formed in a cylindrical shape, and is provided so that its central axis coincides with the needle axis L1. That is, the needle 10 (see FIG. 1) is inserted inside the magnetic core 73. Further, only one magnetic core 73 is provided for each electromagnet 71 and 72. That is, the magnetic core 73 is not divided into a plurality. Accordingly, only one electromagnetic coil 74 is provided for each electromagnet 71, 72. The magnetic core 73 has a protruding portion 76 that protrudes from the end surface of the electromagnetic coil 74 opposite to the side where the permanent magnet 16 is provided. A thread groove is formed on the outer peripheral surface of the protrusion 76. By fitting this screw groove with a nut 86 formed of a nonmagnetic material such as phosphor bronze, the members constituting the electromagnets 71 and 72 are held so as not to fall apart. Instead of fixing with the nut 86, the snap ring method may be used as shown in FIG. 25 of the second embodiment.

  On one end side (the side where the permanent magnet 16 is provided) of the magnetic core 73, an inner magnetic pole portion 75 made of a magnetic material is provided as an integral part of the magnetic core 73. The inner magnetic pole portion 75 is formed in a ring shape coaxial with the magnetic core 73. Further, the inner magnetic pole portion 75 has a magnetic pole surface 75a formed in the same shape (ring shape) as the inner portion 16e at a position facing the inner portion 16e (see FIG. 2) of the permanent magnet 16.

  A coil cover 77 is provided on the other end side of the magnetic core 73 (the side opposite to the side where the permanent magnet 16 is provided). The coil cover 77 is made of a magnetic material such as permalloy. The coil cover 77 has a hole 77a into which the protruding portion 76 of the magnetic core 73 is inserted. At this time, the wall surface of the hole 77a and the outer peripheral surface of the protrusion 76 are in contact. That is, the coil cover 77 and the protrusion 76 (magnetic core 73) are magnetically connected at the position of the hole 77a.

  An outer cylinder portion 78 formed of a magnetic material such as permalloy is provided so as to surround the outside of the electromagnetic coil 74. The outer cylinder part 78 is formed in a cylindrical shape, and is provided so that its central axis coincides with the needle axis L1. At this time, the magnetic core 73 and the electromagnetic coil 74 are disposed in the inner space of the outer cylindrical portion 78.

  An end 78 a of the outer cylinder portion 78 on the side where the coil cover 77 is provided in the axial direction is in contact with a radially outer end 77 b of the coil cover 77. In addition, an outer magnetic pole portion 79 that forms a magnetic pole surface 79 a is provided integrally with the outer cylindrical portion 78 at the end of the outer cylindrical portion 78 opposite to the side where the coil cover 77 is provided. The outer magnetic pole portion 79 is formed so as to protrude radially inward from the end portion of the outer cylindrical portion 78. The magnetic pole surface 79a is formed in the same shape (ring shape) as the outer portion 16d at a position facing the outer portion 16d (see FIG. 2) of the permanent magnet 16.

  An inner magnetic pole part 75 is arranged inside the outer magnetic pole part 79, and these magnetic pole parts 79 and 75 are arranged at intervals. That is, the outer magnetic pole part 79 and the inner magnetic pole part 75 are magnetically separated. The interval between the magnetic pole portions 75 and 79 is larger than the interval between the permanent magnet 16 and the magnetic pole surfaces 75a and 79a (the interval when the movable permanent magnet 16 is located farthest from the magnetic pole surfaces 75a and 79a). The outer magnetic pole portion 79 is magnetically connected to the end portion 76 of the magnetic core 73 opposite to the side where the permanent magnet 16 is disposed via the coil cover 77 and the outer cylinder portion 78.

  In the gap between the inner magnetic pole part 75 and the outer magnetic pole part 79, an intermagnetic pole separator 85 made of a nonmagnetic material such as phosphor bronze is provided. The inter-magnetic pole separator 85 is formed so as not to restrict the flow of the cooling air, and is preferably formed so as to produce a rectifying effect of the cooling air.

  The electromagnets 71 and 72 are provided so that the needle 10 is inserted inside the magnetic core 73. At this time, the upper electromagnet 71 is provided so that the magnetic pole surfaces 75 a and 79 a face the upper surface 161 of the permanent magnet 16. The lower electromagnet 72 is provided so that the magnetic pole surfaces 75 a and 79 a face the lower surface 162 of the permanent magnet 16.

  The energization control unit 61 in FIG. 1 controls the energization direction of the electromagnetic coil 74 so that a repulsive force acts between the upper electromagnet 71 and the permanent magnet 16 when the discharge port 3a is opened. Specifically, the energization controller 61 generates the same magnetic pole as the outer portion 16d of the permanent magnet 16 on the outer magnetic pole surface 79a of the electromagnet 71, and the inner portion 16e of the permanent magnet 16 on the inner magnetic pole surface 75a. The energizing direction of the electromagnetic coil 74 is controlled so that the same magnetic pole is generated.

  The energization control unit 61 controls the energization direction of the electromagnetic coil 74 so that an attractive force acts between the lower electromagnet 72 and the permanent magnet 16 when opening the discharge port 3a. Specifically, the energization controller 61 generates a magnetic pole opposite to the outer portion 16d of the permanent magnet 16 on the outer magnetic pole surface 79a of the electromagnet 72, and the inner portion 16e of the permanent magnet 16 on the inner magnetic pole surface 75a. The energization direction of the electromagnetic coil 74 is controlled so that a magnetic pole opposite to that is generated.

  When the electromagnetic coil 74 is energized, the magnetic pole (magnetic flux) generated at the end of the magnetic core 73 on the permanent magnet 16 side is transmitted to the magnetic pole surface 75 a of the inner magnetic pole portion 75. The magnetic pole (magnetic flux) generated at the end portion 76 of the magnetic core 73 opposite to the side where the permanent magnet 16 is disposed is transmitted to the magnetic pole surface 79 a of the outer magnetic pole portion 79 through the coil cover 77 and the outer cylindrical portion 78. The

  In this way, a repulsive force is applied between the upper electromagnet 71 and the permanent magnet 16, and an attractive force is applied between the lower electromagnet 72 and the permanent magnet 16, thereby moving the permanent magnet 16 downward. The discharge port 3a can be opened.

  When closing the discharge port 3a, the energization control unit 61 switches from the direction of energization when opening the discharge port 3a to reversely apply an attractive force between the upper electromagnet 71 and the permanent magnet 16 and lower the discharge port 3a. A repulsive force is applied between the side electromagnet 72 and the permanent magnet 16. That is, a magnetic pole opposite to the outer portion 16d of the permanent magnet 16 is generated on the outer magnetic pole surface 79a of the upper electromagnet 71, and a magnetic pole opposite to the inner portion 16e of the permanent magnet 16 is generated on the inner magnetic pole surface 75a. . The same magnetic pole as that of the outer portion 16d of the permanent magnet 16 is generated on the outer magnetic pole surface 79a of the lower electromagnet 72, and the same magnetic pole as that of the inner portion 16e of the permanent magnet 16 is generated on the inner magnetic pole surface 75a. Thereby, the permanent magnet 16 can be moved upward, and the discharge port 3a can be closed.

  According to this embodiment, in addition to the effects of the above embodiment, the magnetic core 73 and the electromagnetic coil 74 are not divided, so that the space factor of the electromagnetic coil 74 per one electromagnet 71, 72 can be increased, and the magnetic force can be increased. Can be strong. Thereby, the driving force of the needle 10 can be increased. Further, the configuration of the electromagnets 71 and 72 can be simplified.

  In the present embodiment, the lower electromagnet 72 corresponds to the first electromagnet and the first magnet of the present invention. The upper electromagnet 71 corresponds to a second electromagnet and a second magnet. The coil cover 77, the outer cylinder part 78, and the outer magnetic pole part 79 correspond to the first transmission part. The inner magnetic pole portion 75 corresponds to the second transmission portion.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with a focus on differences from the above embodiment. In the present embodiment, a permanent magnet 80 in FIG. 62 is provided instead of the permanent magnet 16 in FIG. 1, and an electromagnet 81 in FIG. 62 is provided in place of the electromagnets 20 and 21 in FIG. Other configurations are the same as those in the first embodiment.

  The permanent magnet 80 is formed in a disc shape with a magnetic material such as neodymium, for example, and is provided so that the needle 10 is inserted through the center. The entire upper surface 801 of the permanent magnet 80 is set to the same magnetic pole (N pole in FIG. 62), and the lower surface 802 is set to a magnetic pole opposite to the upper surface 801 (S pole in FIG. 62). The magnetization direction of the permanent magnet 80 is set in a direction parallel to the needle axis.

  The pair of electromagnets 81 is provided at a distance from the permanent magnet 80 with the permanent magnet 80 interposed therebetween in the moving direction of the needle 10. Each electromagnet 81 includes a disk-shaped magnetic core 82 having a central axis in the same direction as the axial direction of the needle 10, and an electromagnetic coil 83 wound around the magnetic core 82 around the central axis.

  When opening the discharge port 3a, the energization control unit 61 of FIG. 1 has a magnetic pole (on the upper surface 801 of the permanent magnet 80 on the surface 81a of the upper electromagnet 81 facing the permanent magnet 80, as shown in FIG. 63). The energization direction of the electromagnetic coil 83 of the upper electromagnet 81 is controlled so that the same magnetic pole (N pole) as the N pole) is generated. Further, when opening the discharge port 3a, the energization control unit 61 has a magnetic pole opposite to the magnetic pole (S pole) of the lower surface 802 of the permanent magnet 80 on the face 81b of the lower electromagnet 81 facing the permanent magnet 80. The energization direction of the electromagnetic coil 83 of the lower electromagnet 81 is controlled so that (N pole) is generated.

  That is, when opening the discharge port 3 a, the energization control unit 61 applies a repulsive force between the upper electromagnet 81 and the permanent magnet 80, and between the lower electromagnet 81 and the permanent magnet 80. The energization direction of each electromagnetic coil 83 is controlled so that the attractive force is applied. Thereby, the permanent magnet 80 and the needle 10 fixed thereto can be moved downward, and the discharge port 3a can be opened.

  On the other hand, when closing the discharge port 3a, the energization controller 61 closes the magnetic pole (N of the upper surface 801 of the permanent magnet 80 to the surface 81a of the upper electromagnet 81 facing the permanent magnet 80, as shown in FIG. The energization direction of the electromagnetic coil 83 of the upper electromagnet 81 is controlled so that a magnetic pole (S pole) opposite to the pole) is generated. Further, when closing the discharge port 3 a, the energization control unit 61 has the same magnetic pole (S pole) as the magnetic pole (S pole) of the lower face 802 of the permanent magnet 80 on the face 81 b of the lower electromagnet 81 facing the permanent magnet 80. The energization direction of the electromagnetic coil 83 of the lower electromagnet 81 is controlled so that the (S pole) is generated.

  That is, when closing the discharge port 3 a, the energization control unit 61 applies an attractive force between the upper electromagnet 81 and the permanent magnet 80, and between the lower electromagnet 81 and the permanent magnet 80. The energizing direction of each electromagnetic coil 83 is controlled so as to apply a repulsive force. Accordingly, the permanent magnet 80 and the needle 10 fixed thereto can be moved upward, and the discharge port 3a can be closed.

  Thus, in this embodiment, in addition to the effect of the said embodiment, the structure of the permanent magnet 80 and the electromagnet 81 can be simplified.

(Sixth embodiment)
The sixth embodiment of the present invention will be described focusing on the differences from the above embodiment. As shown in FIG. 65, in this embodiment, a plurality of combinations (two sets in the example of FIG. 65) of a permanent magnet and a pair of electromagnets sandwiching the permanent magnet are provided. Specifically, two permanent magnets 90 and 91 are connected to the needle 10 at an interval in the direction of the needle axis L1. The configuration of each permanent magnet 90, 91 is the same as that of the permanent magnet 16 (see FIG. 2) of the first embodiment.

  The upper permanent magnet 90 has an S pole on the outer side of the upper surface (the surface facing the upper electromagnet 93), an N pole on the inner side, and a lower surface (a surface facing the central electromagnet 92). N poles are generated on the outer side and S poles are generated on the inner side.

  The lower permanent magnet 91 has an S pole on the outer side of the upper surface (the surface facing the central electromagnet 92), an N pole on the inner side, and has a lower surface (facing the lower electromagnet 94). N pole is generated on the outer side of the surface), and S pole is generated on the inner side.

  Three electromagnets 92 to 94 are provided so as to sandwich the permanent magnets 90 and 91 therebetween. Specifically, one electromagnet 92 (hereinafter referred to as a central electromagnet) is provided between the two permanent magnets 90 and 91. One permanent magnet 90 is provided with one electromagnet 93 (hereinafter, referred to as an upper electromagnet) so as to face the surface opposite to the central electromagnet 92. One electromagnet 94 (hereinafter referred to as a lower electromagnet) is provided so as to face the surface of the other permanent magnet 91 opposite to the central electromagnet 92.

  The configurations of the upper electromagnet 93 and the lower electromagnet 94 are the same as the electromagnets 20 and 21 (see FIG. 3) of the first embodiment. That is, the upper electromagnet 93 includes an outer magnetic pole portion 93 a that faces the outer portion (S pole) of the upper surface of the upper permanent magnet 90 and an inner magnetic pole portion that faces the inner portion (N pole) of the upper surface of the upper permanent magnet 90. 93b. On the other hand, the lower electromagnet 94 is opposed to the outer magnetic pole portion 94a facing the outer portion (N pole) of the lower surface of the lower permanent magnet 91 and the inner portion (S pole) of the lower surface of the lower permanent magnet 91. And an inner magnetic pole portion 94b.

  The central electromagnet 92 includes magnetic pole portions on both the upper permanent magnet 90 side surface and the lower permanent magnet 91 side surface. Otherwise, the electromagnets 20 and 21 of the first embodiment (FIG. 3). See). That is, the central electromagnet 92 includes an outer magnetic pole portion 921a that faces the outer portion (N pole) of the lower surface of the upper permanent magnet 90, and an inner magnetic pole portion that faces the inner portion (S pole) of the lower surface of the upper permanent magnet 90. 921b, an outer magnetic pole portion 922a facing the outer portion (S pole) of the upper surface of the lower permanent magnet 91, and an inner magnetic pole portion 922b facing the inner portion (N pole) of the upper surface of the lower permanent magnet 91 Have The outer magnetic pole portions 921a and 922a are connected to the outer peripheral portion 923 of the magnetic core. The inner magnetic pole portions 921b and 922b are connected to the inner peripheral portion 924 of the magnetic core.

  When the energization control unit opens the discharge port 3a, a repulsive force acts between the upper electromagnet 93 and the upper permanent magnet 90, that is, an S pole is generated in the outer magnetic pole portion 93a of the upper electromagnet 93. The energization direction of the upper electromagnet 93 is controlled so that the N pole is generated in the inner magnetic pole part 93b (see FIG. 65).

  When opening the discharge port 3 a, the energization controller is configured so that an attractive force acts between the lower electromagnet 94 and the lower permanent magnet 91, that is, S is applied to the outer magnetic pole portion 94 a of the lower electromagnet 94. The energization direction of the lower electromagnet 94 is controlled so that a pole is generated and an N pole is generated in the inner magnetic pole portion 94b (see FIG. 65).

  When the energization controller opens the discharge port 3a, an attractive force acts between the central electromagnet 92 and the upper permanent magnet 90, and a repulsive force acts between the lower permanent magnet 91. That is, the energization direction of the central electromagnet 92 is controlled so that the S pole is generated in the outer magnetic pole portions 921a and 922a of the central electromagnet 92 and the N pole is generated in the inner magnetic pole portions 921b and 922b.

  Accordingly, it is possible to generate a propulsive force that moves both the permanent magnets 90 and 91 downward, and it is possible to open the discharge port 3a by moving the needle 10 downward along with the movement of the permanent magnets 90 and 91.

  On the other hand, when closing the discharge port 3a, the energization control unit switches the energization direction of the electromagnets 92 to 94 from the energization direction when opening the discharge port 3a. As a result, as shown in FIG. 66, it is possible to generate a propulsive force that moves both the permanent magnets 90 and 91 upward. As the permanent magnets 90 and 91 move, the needle 10 is moved upward and the discharge port is moved. 3a can be closed.

  Thus, in this embodiment, in addition to the above-described embodiment, the propulsive force of the needle 10 can be further increased, and the needle 10 can be further operated at high speed.

  The present invention is not limited to the above embodiment. The above embodiment is merely an example, and has the same configuration as the technical idea described in the claims of the present invention, and can produce any similar effects. It is included in the technical scope of the present invention.

  For example, in the first to fourth embodiments, the example in which the electromagnets are arranged on both the upper and lower sides of the permanent magnet has been described. However, the electromagnet may be provided only on one of the upper and lower sides of the permanent magnet. . Also by this, since the magnetic poles on both sides of the magnetic core of the electromagnet can contribute to the movement of the needle, the needle can be moved quickly. Moreover, by making the magnetic core of the electromagnet into a divided structure as in the first to third embodiments, the heat radiation area of the electromagnet can be increased, and the heat generation of the electromagnet can be suppressed. In addition, when the electromagnet is provided only on one of the upper and lower sides of the permanent magnet, one of the upward movement and the downward movement of the needle uses the magnetic force of the electromagnet and the permanent magnet, and the other uses a spring. You may do it. Further, for example, the needle may be moved upward (in the direction of closing the discharge port) using both the magnetic force of the electromagnet and the permanent magnet and the pressurization by the spring. According to this, the discharge port can be blocked even more quickly. Thus, this invention may be provided with the pressurization mechanism to the moving direction of a needle by a spring.

  Further, in the first, second, and third embodiments, the example in which the magnetic core of the electromagnet is divided into six in the circumferential direction is shown, but even when the number of divisions is other than six (for example, four divisions, eight divisions). good. In this case, the number of divisions of the electromagnet is preferably an even number. In the case of the third embodiment, by setting the number of divisions to an even number, it is possible to alternately generate N poles and S poles in the circumferential direction, and avoid the same magnetic poles from being adjacent to each other in the circumferential direction.

  In the above embodiment, an example in which the needle tip is provided outside the discharge port has been described. However, the present invention may be applied to a fluid discharge device in which the needle tip is provided inside the housing.

  In addition, the present invention may be applied to a fluid discharge device that discharges a highly viscous liquid (for example, a soldering agent, hot grease, solder paste, oil, etc.) other than a hot melt adhesive. The present invention may be applied to a fluid discharge device that discharges a cleaning liquid or the like, or a fluid discharge device that discharges a gas (for example, cleaning air or air for repelling defective products from a line for sorting parts) The present invention may be applied to.

  Moreover, although the example which employ | adopted the special magnetization permanent magnet as a permanent magnet was shown in the said embodiment, you may employ | adopt a Halbach array permanent magnet.

  In the sixth embodiment, the upper and lower electromagnets 93 and 94 have the same structure as that of the first embodiment. However, as long as the structure has magnetic pole portions on the outer side and the inner side of the surface on the permanent magnet side. For example, the structure shown in FIG. 25 or the structure shown in FIG. 61 may be used. In the sixth embodiment, two permanent magnets 90 and 91 and three electromagnets 92 to 94 are provided in the direction of the needle axis L1 so as to sandwich the permanent magnets 90 and 91 therebetween. More permanent magnets and electromagnets may be provided. Thereby, the propulsive force of the needle can be further increased.

  In the fifth embodiment, an example is shown in which one permanent magnet and a pair of electromagnets are provided so as to sandwich the permanent magnet therebetween. However, a pair of electromagnets and a pair of electromagnets interposed therebetween are provided. The permanent magnet may be provided. In this case, the pair of permanent magnets is connected to the needle, and the electromagnet is provided so that its position does not change regardless of the movement of the needle. When opening the discharge port, the energization direction of the electromagnet is set so that a repulsive force acts between the upper permanent magnet and the electromagnet, and an attractive force acts between the lower permanent magnet and the electromagnet. Control. When closing the discharge port, the energization direction of the electromagnet is controlled so that an attractive force acts between the upper permanent magnet and the electromagnet, and a repulsive force acts between the lower permanent magnet and the electromagnet. . Also by this, the propulsive force of the needle can be increased as compared with the case where only one set of permanent magnets and one electromagnet is provided.

  In the sixth embodiment, the upper and lower electromagnets 93 and 94 may not be provided. Even in this case, the needle 10 is moved by using both the force acting between the electromagnet 92 and the upper permanent magnet 90 and the force acting between the electromagnet 92 and the lower permanent magnet 91. Therefore, the propulsive force of the needle can be increased as compared with the case where only one set of permanent magnets and one electromagnet is provided.

DESCRIPTION OF SYMBOLS 1,200 Fluid discharge apparatus 2 Housing 3a Discharge port 10 Needle (movable part)
10a Needle tip (opening / closing part)
16, 48, 80, 90, 91 Permanent magnet 16d, 48a The outer part of the permanent magnet (first magnetic pole part)
16e, 48b Inner part of the permanent magnet (second magnetic pole part)
20, 21, 33, 34, 51, 52, 71, 72, 81, 92, 93, 94 Electromagnet 22, 35, 53, 73, 82 Electromagnetic core 23, 36, 60, 74, 83 Electromagnetic coil 24, 38 57, 79, 93a, 921a, 922a, 94a Electromagnetic outer magnetic pole part 25, 39, 58, 75, 93b, 921b, 922b, 94b Electromagnetic inner magnetic pole part 61 Energization control part (control part)

Claims (20)

A housing in which a fluid discharge port is formed;
An opening / closing portion that opens and closes the discharge port, and a movable portion provided in the housing such that the opening / closing portion reciprocates in a direction of opening and closing the discharge port;
A permanent magnet connected to the movable part;
A pair of electromagnets spaced from the permanent magnet with the permanent magnet in between in the moving direction of the movable part; and
A controller for controlling energization of the electromagnet,
Of the pair of electromagnets, the one that approaches the permanent magnet when the movable part moves in the direction to open the discharge port is the first electromagnet, and the one that moves away from the permanent magnet is the second electromagnet.
When the control unit opens the discharge port, an attractive force acts between the first electromagnet and the permanent magnet, and a repulsive force acts between the second electromagnet and the permanent magnet. The energization direction of the first electromagnet and the second electromagnet is controlled, and when the discharge port is closed, a repulsive force acts between the first electromagnet and the permanent magnet, and the second electromagnet and the The energization direction of the first electromagnet and the second electromagnet is controlled so that an attractive force acts between the permanent magnet,
Each surface which is opposite to the electromagnet of the permanent magnet is provided with a first magnetic pole portion of opposite magnetic poles and the second magnetic pole portion,
The electromagnet
An electromagnetic coil;
A first transmission unit configured to transmit a magnetic flux generated on one end side of the electromagnetic coil to a position facing the first magnetic pole unit to form a magnetic pole;
A fluid ejection device comprising: a second transmission unit configured to transmit a magnetic flux generated on the other end side of the electromagnetic coil to a position facing the second magnetic pole unit to form a magnetic pole.   The gap between the magnetic pole surface formed by the first transmission unit and the magnetic pole surface formed by the second transmission unit is larger than the interval between the magnetic pole surface and the permanent magnet. Fluid ejection device.   The fluid ejection device according to claim 1, wherein the electromagnetic coil is provided in a direction perpendicular to a moving direction of the movable part.   The fluid ejection device according to claim 1, wherein the electromagnetic coil is provided in a direction parallel to a moving direction of the movable part. The first magnetic pole part is provided such that the magnetic pole appears along a circumferential direction centered on the axis of the movable part,
5. The fluid ejection device according to claim 1, wherein the second magnetic pole portion is provided so that the magnetic pole appears along the circumferential direction inside the first magnetic pole portion. 6. .   6. The fluid ejection device according to claim 5, wherein the first magnetic pole part and the second magnetic pole part are set to the same magnetic pole over the entire circumference in the circumferential direction. The first magnetic pole part and the second magnetic pole part are provided so that N poles and S poles are alternately arranged along the circumferential direction,
The first electromagnet and the second electromagnet are respectively wound around the magnetic core divided by the same number as the number of magnetic poles in the circumferential direction of the first magnetic pole portion and the second magnetic pole portion, and the divided magnetic cores, respectively. An electromagnetic coil,
The first transmission unit and the second transmission unit are provided for each of the divided magnetic core and the electromagnetic coil,
The magnetic pole surface of the first transmission part is disposed at a position facing the first magnetic pole part at an interval along the circumferential direction,
6. The fluid ejection device according to claim 5, wherein the magnetic pole surface of the second transmission part is disposed at a position facing the second magnetic pole part at an interval along the circumferential direction.   The said 1st electromagnet and the said 2nd electromagnet are each provided with the magnetic core divided | segmented into plurality, and the electromagnetic coil wound around each of the said divided | segmented magnetic core, The any one of Claims 1-6 characterized by the above-mentioned. The fluid ejection device according to 1.   The magnetic pole appearing on the surface facing the first electromagnet of the permanent magnet and the magnetic pole appearing on the surface facing the second electromagnet are set as opposite magnetic poles. The fluid ejection device according to any one of 1 to 8.   The fluid ejection device according to claim 1, wherein a magnetization direction of the permanent magnet is a direction parallel to a moving direction of the movable part.   The fluid ejection device according to claim 1, wherein a gas inlet for cooling the pair of electromagnets is formed in the housing.   The fluid ejection device according to claim 11, wherein the injection port is provided at a position of the permanent magnet among positions along the moving direction of the movable part.   The groove on the inner wall of the housing is formed so as to be connected to the injection port along the circumferential direction of the inner wall so as to be larger than a gap between the permanent magnet and the inner wall. The fluid discharge device described. Of the pair of electromagnets, the one closer to the discharge port is the discharge port side electromagnet,
The fluid discharge device according to claim 1, wherein an inlet for introducing the fluid into the housing is formed between the discharge port side electromagnet and the discharge port.   The housing includes a heat insulating portion formed of a material having a lower thermal conductivity than the portion where the inlet and the discharge port are formed between the inlet and the discharge port side electromagnet. The fluid ejection device according to claim 14.   The fluid discharge device according to any one of claims 1 to 15, wherein the opening / closing portion is located outside the discharge port.   The fluid ejection device according to claim 1, wherein the fluid is a hot melt adhesive. A plurality of the permanent magnets are connected to the movable part at intervals in the moving direction of the movable part,
18. The fluid ejection device according to claim 1, wherein at least three electromagnets are provided so as to sandwich each permanent magnet therebetween. A housing in which a fluid discharge port is formed;
An opening / closing portion that opens and closes the discharge port, and a movable portion provided in the housing such that the opening / closing portion reciprocates in a direction of opening and closing the discharge port;
A permanent magnet connected to the movable part;
An electromagnet provided to face the permanent magnet in the moving direction of the movable part;
A controller for controlling energization of the electromagnet so as to generate a force for moving the movable part in a direction in which the discharge port opens or closes between the permanent magnet and the electromagnet;
The permanent magnet includes a first magnetic pole portion and a second magnetic pole portion, which are opposite to each other, on a surface facing the electromagnet,
The electromagnet
An electromagnetic coil;
A first transmission unit configured to transmit a magnetic flux generated on one end side of the electromagnetic coil to a position facing the first magnetic pole unit to form a magnetic pole;
A fluid ejection device comprising: a second transmission unit configured to transmit a magnetic flux generated on the other end side of the electromagnetic coil to a position facing the second magnetic pole unit to form a magnetic pole. A housing in which a fluid discharge port is formed;
An opening / closing portion that opens and closes the discharge port, and a movable portion provided in the housing such that the opening / closing portion reciprocates in a direction of opening and closing the discharge port;
A permanent magnet connected to the movable part;
An electromagnet provided to face the permanent magnet in the moving direction of the movable part;
A controller for controlling energization of the electromagnet so as to generate a force for moving the movable part in a direction in which the discharge port opens or closes between the permanent magnet and the electromagnet;
The fluid discharge device according to claim 1, wherein the electromagnet includes a plurality of magnetic cores and electromagnetic coils provided for each of the magnetic cores in a region facing one surface of the permanent magnet.

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