JPS605540Y2 - magnet device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a magnet device used, for example, to drive a hammer in a printer.

Conventionally, this type of magnet device includes an armature for applying driving force to other components, and this armature is attached to a substrate on which a coil wound around a core is attached.

Therefore, the components consist of a substrate, a coil, and an armature, which are each integrated by means of attachment means such as screws.

Therefore, it is difficult to position each part, and if a stopper is provided to set the position and rotation range of the armature, it is not easy to determine the position of the stopper.

This idea was created in view of these points, and allows for easy determination of the relative positions of each component.
The object of the present invention is to obtain a magnet device that is easy to make minute adjustments.

This idea includes providing an armature and a stopper on a substrate, positioning the substrate and a plurality of yokes using holes, recesses, and protrusions, and forming a core with the substrate and yokes and winding the coil together. In this way, the positions of each part can be determined accurately, the components are sufficiently integrated, and the position and rotation range of the armature can also be determined accurately.

An embodiment of this invention will be described based on the drawings.

First, a frame 1 made of Guicast is installed, and a carrier 4 is attached to the guide strip 2 of this frame 1 and a guide shaft 3 fixed to the frame 1 so as to be able to reciprocate. A carriage 6 is attached to which a petal-shaped wheel 5 as a head is detachably attached.

A platen 7 is provided substantially horizontally in the center.

The carrier 4 is made of Guicast, and is formed as a mouth-shaped frame when viewed from above, and an upright portion 8 is integrally formed at the rear portion of the carrier 4, and is in contact with the upper and lower edges of the guide strip 2. Three rollers 9 are attached, and three rollers 10 are provided at the front part, which contact the upper and lower parts of the guide shaft 3.

A drive plate 11a is attached to the center portion, and the drive plate 11a is provided with pins 11 at both ends to which drive wires (not shown) are connected.

Further, a square groove 12 which is located on the same axis and serves as a carriage retaining portion is formed in an approximately central portion of the carrier 4 and is open upwardly.
is formed, and a pin 14 is fixed to this flat surface 13.

Next, a presser 16 having a long hole 15 that fits into the pin 14 is provided on the flat surface 13 so as to be able to move forward and backward, and the presser 16 is fixed with a screw 17 so as to press the shaft of the carriage, which will be described later. be done.

Furthermore, a carriage setting mechanism 18 is provided at the front of the carrier 4.

That is, an L-shaped bent base plate 19 is fixed to the carrier 4, and this base plate 19 includes a base piece 21 having a perpendicular reference plane 20 and a base plate 19 that is biased rearward by an amount outside the plate thickness with respect to this base piece 21. A holding piece 22 is formed, and two side pins 23 protruding forward are fixed to this holding piece 22.

A horizontal long hole 24 into which the guide pin 23 fits
A movable piece 25 is provided along the holding piece 22, and this movable piece 25 is moved in the direction of the base piece 21 by a tension spring 27 stretched between the bent piece 26 at one end and the guide pin 23. energized.

The end of the movable piece 25 on the base piece 21 side has sloped surfaces 28 and 29 on the upper and lower sides, and in particular, a minute flat edge 30 is formed at the tip of the lower sloped surface 29. There is.

Further, the upper surface of the base plate 19 serves as a downward reference surface 31 for a retaining pin, which will be described later.

Next, a holding part 32 for a card holder made of an elastic plate is attached to the front surface of the carrier 4.

The carriage 6 is constructed by assembling various parts to be described later on a main body 33 formed by Gui-casting.

First, a motor 34 is attached to the lower central portion of the main body 33, and a drive shaft 35 is connected to the motor 34 via a universal joint (not shown), and an arm 37 is rotatably held at one end by a shaft 36. It is maintained by

A cross-shaped holding piece 38 for holding the petal-shaped wheel 5 is attached to the tip of the drive shaft 35.

Further, a magnetic body is provided at the intermediate portion of the arm 37, and magnets 39 and 40 are provided above and below it.

Furthermore, stoppers 41 and 42 are provided at the top and bottom of the tip of the arm 37, respectively, for regulating the shift position.

Furthermore, a groove-shaped engagement notch 43 is provided at the tip of the arm 37.
is formed, and one end of this engagement notch 43 is connected to the main body 33.
A plate spring 45 fixed by a screw 44 is engaged with the plate spring 45 .

The tips of these leaf springs 45 and the arm 37 are vertically divided into two parts, and are engaged with a guide piece 46 fixed perpendicularly to the main body 33 to prevent swinging in the front-back direction. ing.

Next, a hammer assembly 4 is disposed above the front part of the main body 33.
7 is installed.

The hammer assembly 47 consists of a holder 48 made of plastic or the like and a hammer 49 slidably held within the holder 48. The hammer 49 is always urged backward by a spring provided within the holder 48. ing.

A magnet assembly 50 is attached to the rear part of the hammer assembly 47.

This magnet assembly 50 has a substrate 51 made of an iron plate and a plurality of yokes 52 made of silicon steel plates stacked on top of each other, and two leg-shaped cores 53 of the same shape are formed on the substrate 51 and the yoke 52. A coil 54 is wound around the core 53 of.

An armature 55 is rotatably attached to one side of the base plate 51, and two stoppers 56 are provided on the other side to restrict the range of rotation of the tip of the armature 55.

These stoppers 56 are composed of eccentric shafts,
The position of the armature 55 is set by rotating and fixing them.

Further, through holes are formed in the substrate 51 and the yoke 52, and are fixed to the main body 33 with screws 57.

Note that the substrate 51 and the yoke 52 are used by being stacked on each other, and their relative positioning is achieved by forming a hole 58 in the substrate 51 and creating a protrusion in the yoke 52 by knockout processing. 59 and recess 6
0, and by fitting the protrusions 59 into the holes 53 and the recesses 60, the layers are stacked while regulating the horizontal direction.

Further, a ribbon cartridge mounting plate 61 is fixed to the rear upper surface of the main body 33.

A ribbon drive motor 62 is attached to the lower surface of one side of the ribbon cartridge mounting plate 61, and the ribbon drive motor 62 and the ribbon drive shaft 63 are connected by gears.

Further, opposing supporting walls 64 are bent on both sides of the ribbon cartridge mounting plate 61, and these supporting walls 64
A support shaft 65 of a predetermined length is fixed on the same axis.

A holding member 66 made of elastic plastic is rotatably attached to these support shafts 65, and a retaining ring 67
Extraction is stopped by.

This holding member 66 has elastic arm portions 69 extending on both sides of the shaft hole 68, and a contact member 70 made of rubber or the like is provided at the tip of these arm portions 69, and one arm An elastic locking tongue 71 extends from the portion 69.
are integrally formed upright.

At the upper end of this locking tongue piece 71, a slope portion 72 and a locking protrusion 73 are provided.
is formed.

Further, the holding member 66 is urged by a tension spring 74 so that the front side thereof faces downward.

Furthermore, an upper stopper 75 is rotatably attached to the central portion of the main body 33 and engages with the front portion of a ribbon cartridge to be described later.

This upper stopper 75 has a slope 76 and a locking step 7.
7 and a protruding piece 78, and is made to stand still in either the held state or the released state by a toggle spring 79.

The main body 33 is provided with a push-up lever 81 that sets the ribbon cartridge 80 in an upward position in conjunction with a push-up mechanism (not shown).

The ribbon cartridge 80 is formed into a substantially U-shape, and on both sides thereof, a locking protrusion 82 is engaged with a locking protrusion 73 of the holding member 66, and a retaining portion 83 is engaged with the upper stopper 75. Support walls 84 are formed at the front and back of the locking protrusion 82 to determine the position of the locking protrusion 73 in the front and back direction.

An endless band-shaped ink ribbon 85 is housed inside, and is led out from the tips of the front legs 86.

Further, ribbon guides 87 are provided on both sides of the hammer assembly 47 of the main body 33.

Both ends of this ribbon guide 87 are fixed to the main body 33, a receiving piece 88 for receiving the holding part 32 of the card holder is formed at the lower front part, and the ink ribbon 85 is formed at the middle part.
A ribbon guide surface 89 is formed to guide the ribbon, and a grip portion 90 is formed at the top.

A support shaft 91 serving as a rotation fulcrum is fixedly penetrated through the center of the lower part of the main body 33.

That is, the support shaft 91 passes through the main body 33 and inserts the bearings 94 with a washer 93 interposed between it and the side surface 92 of the main body 33, and these bearings 94 are held by retaining rings 95 to prevent them from coming out. At the same time, the support shaft 91 is fixed against movement in the left and right direction by a set screw 96.

Further, a locking pin 97 that engages with and disengages from the carriage setting mechanism 18 is formed protrudingly from the central front portion of the main body 33 .

Next, the carriage 6 is provided with lead wires for the drive system and lead wires for the detection system and control system, which are covered with a closely coiled shield to prevent mutual interference. The wires are divided into drive system wires 98 and control system wires 99.

These drive system wires 98 and control system wires 99 are fitted into an arc-shaped recess 101 of a holder 100 fixed to the main body 33, and the outside thereof is connected to a wire fixing member 10.
It is held and fixed by 2.

This wire stopper member 102 is made of an elastic material such as a thin steel plate and is formed into a substantially mountain shape.
8 and has a bent portion 105 at the tip.
holds the control system wire 99 having a small diameter, and its base is fixed to the holder 100 with a screw 107.

In such a configuration, the carrier 4 is attached to the frame 1 so as to be able to reciprocate, and the carriage 6 is detachably attached to the carrier 4. To explain this attachment state, first, the V-shaped groove 12 The bearing 94 of the support shaft 91 is fitted into the support shaft 91 and temporarily fixed with the presser tool 16 so that it can move in the left and right direction.

In this state, when holding the grip part 90 and pushing down the front part, the locking pin 97 retracts the movable piece 25 of the carriage setting mechanism 18 and comes into contact with the reference surface 31, and the inclined surface 29 of the movable piece 25 causes Since the carriage 6 is also pressed against the reference surface 20 of 21, the vertical and horizontal positions of the carriage 6 are accurately determined.
If the carriage 4 is securely fixed, the carriage 6 will be attached to the carrier 4.
The installation is complete.

At this time, both ends of the bearing 94 are stopped by retaining rings 95, and the dimensional error between the side surfaces 92 of the main body 33 is absorbed by the wave washer 93, so that reliable positioning is possible without requiring any high dimensional accuracy. It will be done.

Therefore, when replacing the petal-shaped wheel 5, if you hold the grip part 90 and pull it upward, the carriage 6 will rotate around the support shaft 91 and move upward, and you can also reset it by holding the grip part 90 and pulling it upward. This is easily done by simply pressing down.

At this time, since the movable piece 25 is formed with a flat edge 30, there is sometimes a click feeling when moving the carriage 6 upward, giving a good operating feeling. To prevent the carriage 6 from being lifted up due to inertia when pushing up the object.

Next, the ribbon cartridge 30 is attached by simply pushing it down from above, causing the holding member 66 to bend and its locking protrusion 73 to engage with the locking protrusion 82, thereby setting the ribbon cartridge 30.

At this time, no matter which position the upper stopper 75 is in, it joins with the inclined surface 76 and becomes the released state, or if it is in the released state, it directly contacts the protrusion 78 and the upper part of the engaging part 83 The locking step portion 77 is positioned at.

At this time, a certain distance exists between the engaging portion 83 and the locking step portion 77.

The front part of the ribbon cartridge 80 is pushed up by the push-up rod 81 during printing, but at this time, the engaging part 8
3 comes into contact with the locking step 77 to prevent upward movement.

In this manner, when the ribbon cartridge 80 shifts up and down, the only movable parts are the ribbon cartridge 80 itself and the holding member 66, so the movable weight is extremely light and vibrations are less likely to occur.

The vertical shifting of the ribbon cartridge 80 is performed independently of the vertical shifting of the petal-shaped wheel 5, but the shifting of the petal-shaped wheel 5 is determined by the selection of energization of the magnets 39 and 40. It is done.

That is, when the upper magnet 39 is energized, the arm 37 rotates upward to place the petal-shaped wheel 5 in the upper position, and when the lower magnet 40 is energized, the arm 37 rotates downward to place the petal-shaped wheel 5 in the upper position. type wheel 5
is the lower position.

As a result, the circumferential position of the hammer 49 changes and is shifted up and down, making it possible to print twice the number of fingers of the petal-shaped type wheel 5.

At this time, the arm 37 is biased in the neutral direction by the leaf spring 45, but the magnet 39.
In order for the capacity of the leaf spring 40 to be small and the upward and downward shifts to be performed in a well-balanced manner, the spring constant of the leaf spring 45 is required to be small and the operating force in the vertical direction to be constant.

Of course, since the weight of each component is affected, the neutral position is not located at the midpoint of the magnets 39 and 40, but is located slightly above.

Therefore, it is easy to set the orientation point of the leaf spring 45 in this neutral direction by setting the plane direction of the mounting part in advance, and the free state of the leaf spring 45 is the neutral position, and when it is bent, Since the spring constant acts only temporarily in the magnet 39.4
The suction force at 0 may be weak, and there will be no variation in either the up or down shift direction.

In this way, when printing, either the magnet 39 or the magnet 40 is always energized, but when the coil 54 is energized in this state, the armature 56 is attracted, and the armature 55 pushes the hammer 49. By striking, an impact is applied to the recording paper and the ink ribbon 85 interposed between the platen 7 and the ink ribbon 85 via the petal-shaped type wheel 5, thereby performing printing.

In order to perform such a printing operation accurately, the relative position of the hammer 49 and the armature 55 and their stroke relationship must be fixed.
The relative position of the hammer 49 with respect to the body 33 is predetermined by positioning only the hammer assembly 47.

Therefore, only the hammer stroke needs to be determined later, and this is determined by the magnet assembly 50.

That is, when assembling the magnet assembly 50, the range in which the armature 55 operates most efficiently and its operating angle can be determined by adjusting the stopper 56 of the magnet assembly 50 alone.

Therefore, when assembling the magnet assembly 50, which has been set in a specified state in advance, to the main body 33 using the screws 57, adjustment of this part is completed by simply setting the relative position with the hammer 49 to be correct.

Therefore, since there is only one adjustment required to position the magnet assembly 50, the assembly work is easy.
And it is done quickly.

Next, the drive system wire 98 and the control system wire 99, each of which has a plurality of lead wires tied together, are fixed at their bases with a wire fastening member 102.
The holding body 100 has two arc-shaped recesses 101 adjacent to each other, and the drive system wire 98 and the control system wire 99 are fixedly attached with their outer peripheral surfaces in close contact with each other. This means that the space occupied by the wires 98 and 99 around the attachment portions can be narrow, which facilitates processing in this type of device where the wire insertion space is small.

Therefore, compared to the conventional method in which the wires are fastened individually or the set screw is inserted between the wires even if they are fastened all at once, it occupies less space, and the reciprocating carriage 6, etc. Since the space occupied in the entire width direction can be reduced, the overall size can be considerably reduced.

Moreover, since the wire fastening member 102 is a single component and can fasten the two wires 98 and 99 at the same time, the number of parts is small and manufacturing is easy.

In the above embodiment, the spring provided in the magnet assembly 47 was used for returning the armature 55, but the magnet assembly 50
When used for other purposes, another spring is engaged with the armature 55 to bias it away from the core 53.

This invention enables the board and multiple yokes to be stacked while accurately positioning each other by fitting the holes and the protrusions and the recesses and the protrusions as described above. Since the core around which the coil is wound is formed, it is easy to integrate the board and yoke, and the armature attached to the board is accurately positioned relative to the core, and the position adjustment using the stopper is extremely small. It has the effect that it can be used.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a perspective view, Fig. 2 is a front view of the carriage, Fig. 3 is a plan view of the carriage, Fig. 4 is a side view of the carriage, and Fig. 5. is a plan view of the carrier, FIG. 6 is a side view of the carrier, FIG. 7 is an exploded perspective view of the carriage setting mechanism, FIG. 8 is an enlarged front view of a portion thereof, and FIG. 9 is a longitudinal cross-section of the support shaft of the carriage. A front view, FIG. 10 is a vertical cross-sectional side view of the fastening part between the carrier and the carriage, FIG. 11 is a vertical cross-sectional side view of the wire fastening part,
Fig. 12 is a plan view of the wire stopper, Fig. 13 is a front view of the drive shaft shift mechanism, Fig. 14 is a perspective view of the hammer assembly, Fig. 15 is a plan view of the magnet assembly, and Fig. 16 is a plan view of the magnet assembly. 17 and 18 are cross-sectional views of the magnet assembly, FIG. 19 is a perspective view of the ribbon cartridge, and FIG. 20 is a rear view of the upper stopper.
FIG. 1 is a perspective view of a holding member of a ribbon cartridge. 51... Board, 52... Yoke, 53
... Core, 54 ... Coil, 55 ...
... Armature, 56 ... Stopper,
58... Hole, 59... Protrusion, 60...
・・・Concavity.

Claims (1)

[Scope of utility model registration request] A positioning hole is formed in a substrate on which the armature is rotatably mounted and is provided with a stopper for setting the position and rotation range of the armature, and a plurality of yokes stacked on this substrate are fitted into the hole. A protrusion and a recess into which the protrusion fits are formed by knockout processing, and the substrate and the yoke are overlapped while the hole and the protrusion and the recess and the protrusion are fitted, and these substrates and A magnet device characterized by forming a core with a yoke and winding a coil around the core.