JP2001123353A - Weaving machine equipped with piezoelectric element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure exact connection between a selection member and a lifting member in a weaving machine in which the lifting member that is lifted by a knife, for example, a hook, a yarn carrier, and the like, is switched its positions from one to the other by using a piezoelectric element capable of curving by applied voltage in order to selectively hold the lifting member. SOLUTION: A bimorph type piezoelectric element prepared by laminating a thin metallic plate to a piezoelectric ceramic is used and the piezoelectric element is supported with an attachment in the state where an electroconductive rubber is intervened at least between the piezoelectric ceramic and a supporting wall and the attachment is fixed to a base plate in the state that the electroconductive rubber is brought into contact with a connection part provided on the base plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a piezoelectric element which is bent by application of a voltage to switch a selection member between two positions with respect to a vertical member such as a vertical needle or a thread carrier which is raised by a knife, and selectively switches the vertical member. And is used in a single-acting or double-acting jacquard loom, an akisminster carpet loom, and the like.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Hei.
One disclosed in Japanese Patent Publication No. 1-81104 is known. In these devices, when switching to the two positions of the selection member for selecting the needle of the vertical needle and the height of the thread carrier, a piezoelectric element which bends by applying a voltage instead of a conventionally used solenoid is used as an actuator. In addition, the size of the selection device is reduced to reduce power consumption and to suppress heat generation during operation.

In these devices, the piezoelectric element for operating the selection member uses a lead wire connected to each electrode when connecting electrodes for applying a voltage to the connection portions of the substrate. However, the number of vertical needles used in looms is extremely large, and the number of lead wires is a multiple of that number, which hinders the connection work to the control board and causes a pattern collapse if an incorrect connection occurs. become.
In addition, both the vertically moving needle or the thread carrier and the selection member that is oscillated by the piezoelectric element are selectively engaged during the operation, but the two-position switching of the selection member is extremely narrow. In the meantime, the engagement between the small selection member and the elevating member is selected. Moreover, since the loom is constantly vibrating during weaving, if the operation of both is inaccurate due to slight timing deviation, the selection of holding / non-holding of the elevating member will be erroneous. A shift occurs in the opening of the warp and the height of the yarn carrier, resulting in a pattern collapse in the woven fabric.
Therefore, it is not possible to cope with the high-speed operation of the loom,
There was also a disadvantage that the weaving speed of the woven fabric could not be increased.

[0004]

Technical Problem The present invention switches a selecting member to two positions by using a piezoelectric element which is bent by applying a voltage to a vertically moving member such as a vertical needle or a thread carrier which is raised by a knife, and selects a vertically moving member. SUMMARY OF THE INVENTION It is an object of the present invention to provide a loom in which a selection member and an elevating member can be accurately engaged.

[0005]

The first technical means for solving this technical problem relates to a structure for supporting a piezoelectric element on a control board in a loom. (A) A thin metal plate and a piezoelectric magnet are laminated. Using a bimorph type piezoelectric element,
The piezoelectric element is supported by the fixture with at least the conductive rubber interposed between the piezoelectric magnetism and the support wall, and (c) the fixture is contacted with the conductive rubber at the connection portion provided on the substrate. That it is fixed to a substrate. The second technical means relates to a mechanism for engaging a vertical needle of a double-acting jacquard machine, and (d) a hook formed on the head of the vertical needle.
(E) a vertical needle control section formed on the upper part of the guide plate for guiding the vertical needle; (f) an engaging portion of a hook provided on both side edges of the vertical needle control section; (H) the free end side of the selection member is switched by the piezoelectric element between a position on the same plane as the path of the vertical needle and a position other than the position, 1) The vertical needle, on which the selecting member descends on the course, is shifted to the side edge side so that the hook is engaged with the engaging portion. A third technical means is to attach the piezoelectric element of the jacquard machine using the second technical means by the first technical means.

In the first technical means, a bimorph type element composed of a thin metal plate and piezoelectric magnetism is adopted as the piezoelectric element, and the mounting element is fixed to the substrate while the piezoelectric element is supported by the mounting element. Therefore, the piezoelectric element can be easily and accurately fixed to the substrate. When the piezoelectric element is supported by the fixture, conductive rubber is interposed at least between the piezoelectric magnetism and the support wall, and the fixture is fixed to the substrate and the conductive rubber is provided on the substrate at the same time. Therefore, the fixing of the piezoelectric element to the substrate and the reliable connection of the piezoelectric magnetic portion are performed simultaneously (refer to claim 1). Therefore, when the loom is operated, an accurate voltage can be applied to the piezoelectric element, and the engagement between the selecting member and the elevating member can be accurately performed.

In the jacquard machine according to the second technical means, the heald is controlled by raising and lowering the vertical needle. A control section is provided above the guide plate for guiding the vertical needle, into which the head of the raised vertical needle enters. Engagement portions are formed on both side edges of the control portion so as to control engagement and non-engagement of a hook formed on the head of the entered vertical needle. . A selection member that swings along a vertical plane with respect to the guide plate is disposed at the center of the control unit, and the free end side of the selection member is moved by the piezoelectric element to a position on the same plane as the path of the vertical needle and a position not so. When you switch,
The selecting member positioned on the course shifts the descending vertical needle to the side edge side and locks the hook with the engaging portion, and when the selecting member is not on the course, the vertical needle moves to the side edge. Without being shifted to the side, it escapes from the control unit and descends as it is (see claim 2). Therefore, the engaging portion in the stationary state is raised to lock only the displaced vertical needle, so that the engagement operation of the vertical needle can be performed accurately.

The third technical means is to attach the piezoelectric element used in this jacquard machine by the first technical means, so that the connection of the piezoelectric element can be surely performed and the engagement operation of the vertical needle can be improved. It can be performed more accurately (see claim 3).

In the piezoelectric element according to the first and third technical means, one of the electrodes constituting the piezoelectric element is formed of a thin metal plate. Similarly to the above, the thin metal plate is supported by the fixture with another conductive rubber interposed therebetween, and the fixture can be fixed to the substrate in a state where the conductive rubber is in contact with the connection portion provided on the substrate. (See claim 4). In this case, the fixing of the piezoelectric element to the substrate and the connection of the thin metal plate and the piezoelectric magnetism can be performed simultaneously. In addition, the thin metal plate can be fixed to the connection portion by soldering to the connection portion provided on the substrate (see claim 5). In this case, since the soldering operation can be performed in a state where the thin metal plate and the connection portion are close to or in contact with each other, the connection operation can be performed efficiently. In any case, the thin metal plate can be securely connected to the substrate, and when the loom is operated, the correct voltage is applied to the piezoelectric element, and the engagement between the selection member and the elevating member is accurately performed. Can be performed.

[0010]

As a result of the accurate engagement between the selecting member and the elevating member, there is an advantage that the use of the thread for forming the design of the fabric becomes accurate and the pattern does not collapse. In addition, since the holding of the lifting member can be reliably selected, there is an advantage that the loom can be operated at a high speed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 show an embodiment of the above-mentioned third technical means, and show schematic views of an apparatus for controlling a heald in a jacquard loom. FIG. 1 is a front view of a guide plate 21 for guiding vertical needles 11 and 12 which are alternately ascending and descending to be positioned in concave portions on the surface, and FIG. FIG. 3 is a side view of the needle control unit, FIG. 3 is a front view of the guide plate 21 in a state where the swinging piece 31 is engaged with the piezoelectric element 36, and FIG. 4 is a side view thereof. In FIG. 1, on a guide plate 21, a connecting tool 3
The two pulleys 1 and 2 are connected to each other so as to be able to move up and down, and the lower pulley 2 has one end 6 fixed to the lower end of the guide plate 21 and the other end 7 to a heald (not shown). Is suspended. The upper pulley 1 is hung with wires 15 having longitudinal needles 11 and 12 connected to both ends. Outside the left and right side edges of the guide plate 21, knives 23 and 24 that alternately move up and down along the guide plate 21 are arranged.
The vertical needles 11 and 12 are alternately moved up and down by hooking the engagement projections 13 and 14 protruding outward. These wires 5 and 15 do not necessarily need to be made of metal, and fine strings and threads can be used as long as they are strong. A guide ridge 22 is provided at the center of the guide plate 21. Each of the vertical needles 11 and 12
And can be moved up and down linearly.

Hooks 17 and 18 are formed on the heads of the vertical needles 11 and 12 toward the outside thereof, and can be engaged with engaging portions 27 and 28 formed on a vertical needle control unit 25 described later. I have to. Small protrusions 15 and 16 are provided on the back side of the heads of the vertical needles 11 and 12 to reduce the contact area of the vertical needles with the guide plate 21 at the time of elevating and lowering the sliding resistance at the time of elevating and lowering. Is reduced so that it can be moved up and down smoothly. When the vertical needles 11 and 12 rise, they enter the vertical needle control unit 25 formed on the head of the guide plate 21. At this time, a step 25 which is higher than the surface of the guide plate 21 and slightly lower than the heights of the small projections 15 and 16 is formed at the center of the vertical needle controller 25, and the vertical needle head ascending and descending at this step. The heads of the vertical needles 11 and 12 are prevented from moving toward the center by guiding the small projections 15 and 16 of the section. A swinging piece 31 as a selection member is disposed at the center of the vertical needle control section 25 with its upper end pivotally supported by the guide plate 21. Board 21
Swings along a vertical plane with respect to.

As shown in FIG. 2, a plurality of guide plates 21 are stacked, and are supported by the frame 10 using a pin or the like inserted into a through hole 29 formed in the center of the guide plate 21. To form a control unit. In an actual loom, the heald is controlled by combining a large number of these units. A control board 30 for operating the piezoelectric element 36 for driving the rocking piece 31 is disposed on the upper portion of the frame 10. The piezoelectric elements are fixed to the board 30 in accordance with the number of the rocking pieces 31. (Only one piezoelectric element is shown in the drawings for convenience of explanation).

The swinging piece 31 has an upper part pivotally supported by the guide plate 21 and a lower end swinging up and down.
You will respond to 1,12. An engaging recess 32 is formed at the upper end of the swinging piece 31, and the lower end of the piezoelectric element 36 faces the inside of the recess 32. In this embodiment, the piezoelectric element 36 uses a bimorph-type element in which piezoelectric magnets 38 are laminated on both sides of a metal thin plate 37, and extrudes the piezoelectric magnets 38 at the tips to expose the metal thin plate 37. We use what we let you do. Of course, a two-layer structure in which a thin metal plate and one piece of piezoelectric magnetism are laminated can also be used. The piezoelectric element 36 is mounted and fixed on the mounting base 41 whose lower end is slightly shifted outward. The pedestal 41 is fixed in such a manner that it cannot be moved by inserting a projection 42 provided on the upper lower surface into a through hole provided in the substrate 30 and screwing it to the substrate with a hole 43. The pedestal 41 fixed to the substrate 30
On the other hand, the piezoelectric element 36 is fixed by supporting the front end of the piezoelectric element 36 in front of the front end thereof with a fixture 44 having an inverted U-shape and engaging the lower end of the fixture with the pedestal 41. A conductive rubber 45 is interposed between the back side of the inverted U-shaped portion of the fixture 44 and the piezoelectric magnetism 38, and the conductive rubber 45 is attached to the substrate 30 while the fixture 44 presses the piezoelectric element 36. Is pressed by the connection portion of the slab to energize. The conductive rubber 45 that is in contact with the piezoelectric magnetism 38 may be formed separately from the left and right sides, but may be integrally formed in an inverted U-shape according to the shape of the fixture 44. In the latter case, it is necessary to prevent the conductive portion from contacting the thin metal plate 37 by forming the intermediate portion with insulating rubber or the like. On the other hand, the thin metal plate 37 is located on the connection portion of the substrate while the piezoelectric element 36 is supported, and is supplied with solder 46 as it is (see FIG. 4). In this example, the piezoelectric element 36 is attached to the substrate via the pedestal 41, but the attachment 44 may be directly fixed to the substrate 30.

[0015] Hemispherical projections 47, 47 for holding the piezoelectric element 36 from the left and right are formed at the lower portion of the fixture 44 so that the piezoelectric element 36 can be smoothly curved when the piezoelectric element 36 is applied. I have. Further, a projection 48 is provided at the displaced lower end of the pedestal 41, and functions as a stopper so that the piezoelectric element 36 that is applied and curved is stopped at a fixed position.

When a voltage is applied to the piezoelectric element 36 by applying an electric signal to the vertical needles 11 and 12 raised by the knives 23 and 24, the piezoelectric element 36 is divided into a curved one and a non-bent one. Sway. The piezoelectric element, to which no voltage is applied and which does not bend, keeps the state in which the swinging piece 31 is not operated and the lower end thereof is kept floating (see FIG. 4).
The state where the vertical needles 11 and 12 are off the course is maintained. Therefore, the vertical needles 11 and 12 are directly lowered. When a voltage is applied and the piezoelectric element 36 bends, the swinging piece 31 with which the tip is engaged is operated to move the lower end from the state of FIG. 4 to the right side, thereby narrowing the path of the vertical needle. . Then, the vertical needles 11 and 12 that are going to descend collide with the lower end of the swinging piece 31 and are shifted outward, and the hooks 17 and 18 of the head are formed on the outer edge of the insertion portion 25. Caught on joints 27 and 28,
The descent will be stopped.

When the vertical needles 11 and 12 move up and down smoothly without being held by the engaging portions 27 and 28, the wire 5 does not move, so that the heald does not rise and the warp does not open. One vertical needle, for example, the vertical needle 11 is
, The other vertical needle 12 holds the knife 2 in that state.
4 (at this time, the knife 23 separates from the vertical needle 11 and moves down alone), the pulleys 1 and 2 are raised, the heald rises, and the warp opens.

[Brief description of the drawings]

FIG. 1 is a front view of a guide plate for guiding a vertical needle.

FIG. 2 is a side view of a vertical needle control unit in which guide plates are stacked.

FIG. 3 is a front view of a guide plate in a state where a rocking piece is engaged with a piezoelectric element.

FIG. 4 is a side view of a guide plate in a state where a rocking piece is engaged with a piezoelectric element.

[Explanation of symbols]

1, 2 pulleys, 5, 15 wires, 11, 12 vertical needles,
15, 16 small protrusion, 17, 18 hook, 21 guide plate, 25 vertical needle control unit, 27, 28 engagement unit, 30 board, 31 rocking piece,
36 piezoelectric element, 41 mounting base, 44 mounting fixture, 45 conductive rubber

Claims (5)

[Claims] An elevation member such as a vertical needle or a thread carrier which is elevated by a knife is switched between two positions by using a piezoelectric element which is bent by applying a voltage to selectively hold the elevation member. In such a loom, a bimorph type piezoelectric element in which a thin metal plate and piezoelectric magnetism are laminated is used, and the piezoelectric element is attached to a fixture with at least a conductive rubber interposed between the piezoelectric magnetism and the support wall. A loom that is supported, and a fixture is fixed to a substrate while conductive rubber is in contact with a connection portion provided on the substrate. 2. A jacquard wherein a selection member is switched to two positions by using a piezoelectric element which is bent by applying a voltage to a double-acting vertical needle raised by a knife to selectively hold the vertical needle. In a loom, a hook formed on the head of a vertical needle, a vertical needle control section formed on an upper portion of a guide plate for guiding the vertical needle, a hook engaging section provided on both side edges of the vertical needle control section, and an insertion section A selection member that is arranged at the center of the guide plate and swings along a vertical plane with respect to the guide plate, and the free end side of the selection member is switched by the piezoelectric element between a position on the same plane as the path of the vertical needle and a position that is not. A jacquard-type loom in which a vertical needle on which a selection member descends on a course is shifted to a side edge side and a hook is locked to an engagement portion. 3. A bimorph type piezoelectric element in which a thin metal plate and a piezoelectric magnet are laminated, and the piezoelectric element is supported by a fixture with at least a conductive rubber interposed between the piezoelectric magnet and the support wall. 3. The jacquard loom according to claim 2, further comprising a piezoelectric element support structure for fixing the mounting member to the substrate in a state where the conductive rubber is brought into contact with the connection portion provided on the substrate. 4. A thin metal plate is supported by a fixture with conductive rubber interposed between the support wall and a mounting wall, and the fixture is fixed to the substrate in a state where the conductive rubber is in contact with a connecting portion provided on the substrate. The loom according to claim 1 or 3, wherein 5. The loom according to claim 1, wherein the thin metal plate is positioned on a connection portion provided on the substrate and soldered.