JPH0733985U - Piezoelectric actuator - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] A spherical body made of resin is attached to the front and rear ends of the piezoelectric body by integral molding, and these ends are not fixed and movable. In a piezoelectric actuator in which a resin-made rotating body is integrally molded and can be rotated at a position midway between the front end portion and the rear end portion of the piezoelectric body, the resin spherical body or the rotating body and the piezoelectric body can be attached. Position accuracy is a problem, and the resin easily wears and requires oiling to prevent the wear, and it becomes expensive in terms of cost. It prevents fluctuations and disturbances in the stroke of the finger connected to the piezoelectric body. [Structure] A spherical body made of resin and a rotating body made of resin are not attached, and the other end of the piezoelectric body 7 is fixed by a bar 33. The accuracy of the mounting position between the resin spherical body and the rotating body and the piezoelectric body and the abrasion of the resin do not pose a problem, and the cost is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piezoelectric actuator, and more particularly, to a needle selecting device for a knitting machine that selects a knitting needle.

[0002]

[Prior art]

 In a knitting machine such as a sock circular knitting machine, a needle selecting device (needle selecting actuator) is used to perform a needle selecting operation of the knitting needle. To explain one example thereof, as shown in FIG. 6, a large number of needle selecting devices 3 for controlling the vertical movement of the knitting needles 2 arranged in the knitting cylinder-1 are arranged around the knitting cylinder-1, The needle device 3 is connected to the patterning controller 4, the pattern knitting procedure is sent from the patterning controller 4, and the knitting needle 2 is moved up and down to knit a sock pattern. Although not shown here, a large number of needle selection jacks provided with protruding bats are arranged below the knitting needles 2, and a large number of knitting needles 2 are brought into contact with the upper portions of the jacks so that the yarn 5 Is supplied from the bobbin 6 and the needle selecting device 3 is caused to act on the needle selecting jack to move the knitting needle 2 up and down as described above to perform knit knitting of socks. Note that the needle selecting device 3 may directly act on the knitting needle 2.

An example of the needle selecting device 3 will be described based on a piezoelectric driving method. As shown in FIG. 4, the piezoelectric body 7 is supported in multiple stages on a support body 8 and a finger is attached to an end portion of the piezoelectric body 7. 9 is attached, the tip of the finger 9 is projected from the opening 11 of the stopper portion 10 of the support 8, and the knitting needle 2 of the knitting needle 2 is pressed by pressing or not pressing the pad of the needle selection jack as described above. I am selecting needles. The piezoelectric body 7 in the needle selecting device 3 is, for example, as shown in FIG. 5, a ceramic made by firing zirconic acid-lead titanate (PZT.) On both surfaces of the shim material 12. The piezoelectric element 13 made of a material is attached to the piezoelectric element 13. When a voltage (pulse) is applied to the piezoelectric element, it is distorted or mechanical stress is generated. The mechanical vibration caused by the piezoelectric phenomenon is used to select the knitting needles, and as shown in the drawing, the piezoelectric body 7 is operated from the patterning controller 4 via the lead wire 14, The knitting needles 2 are selected by operating the fingers 9.

To explain an example of the needle selection operation for a piezoelectric pressing method, as shown in FIG. 5B, a voltage is applied from the patterning controller 4 to the piezoelectric element 13 via the lead wire 14. When (or when a positive pulse is applied), the piezoelectric body 7 is bent, the finger 9 is directed downward, and the butt 16 of the needle selection jack 15 is not pressed. As a result, the raising cam butt 17 at the lower end of the needle selection jack 15 engages with the raising cam 18, and the needle selection jack 15 and the knitting needle 2 that is in contact with the upper portion thereof are moved upward, resulting in knitting. The stitches are formed by the needle 2. On the other hand, as shown in FIG. 5 (A), when no voltage is applied (or when a negative pulse is applied), the piezoelectric body 7 does not bend, and therefore the butt 16 of the needle selection jack 15 is pressed. Therefore, the raising cam butt 16 at the lower end of the needle selection jack 15 does not engage with the raising cam 18, and the mesh needle 2 abutting above the needle selection jack 15 is not knitted. ing.

In such a needle selecting device, as shown in FIG. 3 (A), a spherical body 19 is attached to the rear end of the piezoelectric body 7, and the rear end of the piezoelectric body 7 to which the spherical body 19 is attached is The support body 8 is fitted into the groove portion 21 of the piezoelectric body mounting portion 20 so that the spherical portion of the spherical body 19 can be moved in the groove portion 21 of the piezoelectric body mounting portion 20, and accordingly, the rear end portion of the piezoelectric body 7 Is made movable, and the rotary body 23 is fixedly attached to the piezoelectric body 7 at a position midway between the rear end and the front end of the piezoelectric body 7, and both ends of the rotary body 23 are attached to the rotary body mounting portion of the support body 8 (halfway fulcrum). Part) 24 so as to be rotatably installed, and the same spherical body 19 as described above is attached to the tip of the piezoelectric body 7, and the spherical body 19 is held in the U-shaped groove 22 at the rear end of the finger 9. So that the spherical body 19 can move within the rear end of the finger 9. Therefore, there is a device in which the tip of the piezoelectric body 7 is also movable. A pin 27 is inserted through the pin hinge portion 26 of the finger 9 and is supported by the finger support portion 25 of the support body 8. That is, as described above, the apparatus makes the rear end portion and the front end portion of the piezoelectric body 7 movable when the voltage is applied (or a positive pulse is applied) to the piezoelectric element 13 to activate the piezoelectric body 7. Furthermore, the middle positions of the rear end and the front end of the piezoelectric body 7 are also movable. According to such a device, the piezoelectric body 7 can move freely, and its movement is not hindered, and the fulcrum in the middle Since it is formed, the needle selection speed can be significantly increased compared to the conventional piezoelectric needle selection device and electromagnetic needle selection device, and it has an excellent advantage such as long life. . The fulcrum is formed midway by fixing the rotator 23 in the middle of the rear end and the front end of the piezoelectric body 7.

[0006]

[Problems to be solved by the device]

 However, in the device, as described above, the spherical bodies 19 are attached to the rear end portion and the front end portion of the piezoelectric body 7, respectively, and in the middle position between the front end portion and the rear end portion of the piezoelectric body 7. Although the rotating body 23 is also attached, these are performed by a method such as injection molding (integral molding) performed by injecting the resin forming the spherical body 19 and the rotating body 23 into the piezoelectric body 3. In the integral molding method, there is a problem in the mounting position accuracy of the resin spherical body 19 and the rotary body 23 and the piezoelectric body 7, and the resin is easily worn, so that oiling is required to prevent the wear, In addition, the cost will be high. Furthermore, in the above device, since the rear end and the front end of the piezoelectric body 7 are movable without being fixed, the piezoelectric body 7 can also be moved left and right, and the rotary body mounting portion (halfway fulcrum portion) 24 of the piezoelectric body 7 can be moved. If the mounting position of the piezoelectric body 7 fluctuates, the position of the piezoelectric body 7 also fluctuates, and as shown in FIG. 3 (B), the finger 9 of the spherical body 19 at the center of the rotary body mounting portion 24 and the tip of the piezoelectric body 7. The distance X between the contact point and the contact point changes with the distance Y between the contact point and the center of the pin 27 in the pin hinge portion 26, and the distance Z between the center of the pin 27 and the tip of the finger 9. And the stroke of the finger 9 may be disturbed. The present invention is intended to provide a technique capable of solving the above-mentioned drawbacks. Other objects and novel features of the present invention will be apparent from the entire description of the present specification and the accompanying drawings.

[0007]

Means for Solving the Problems The present invention to achieve the above object comprises a piezoelectric body and a finger, the piezoelectric body is operated to operate the finger, and the operation of the finger causes the knitting machine to operate. A piezoelectric actuator for selecting a knitting needle, controlling a heddle rod of a loom, etc., wherein one end of the finger is connected to one end of the piezoelectric body to hold the middle position of the piezoelectric body, In the piezoelectric actuator that is slidable at one end of the finger, the other end of the piezoelectric body is fixed so that the piezoelectric body does not slide at the one end of the finger. It is related to actuators. Further, the present invention comprises a piezoelectric body and fingers, which actuate the piezoelectric body to actuate the fingers, and the actuation of the fingers controls the knitting needles of the knitting machine or the heald rod of the loom. This is a piezoelectric actuator that connects one end of the finger to one end of the piezoelectric body and is movable without fixing the other end of the piezoelectric body. In the piezoelectric actuator that is slidable, the piezoelectric actuator is characterized in that the middle position of the piezoelectric body is fixed so that the piezoelectric body does not slide at one end of the finger.

[0008]

[Action]

 In the conventional example, a spherical body 19 is attached to each of the rear end portion and the front end portion of the piezoelectric body 7, and a rotating body 23 is attached to a middle position between the front end portion and the rear end portion of the piezoelectric body 7. These are performed by a method such as injection molding (integral molding) in which resin is injected into the piezoelectric body 3, and the accuracy of the mounting position of the piezoelectric body 7 and the spherical body 19 made of resin and the rotating body 23 and the like. This is a problem, and the resin is liable to wear and requires lubrication to prevent the wear, and the cost is high. However, in the first device of the present invention, the above means is used. As shown in, the spherical body 19 is not attached to one end (tip) of the piezoelectric body 7, but only one end of the finger is connected to the tip of this piezoelectric body. Similarly, the spherical body 19 is not attached to the rear end portion of the piezoelectric body 7. Further, the rotating body 23 is not attached to the middle position between the front end and the rear end of the piezoelectric body 7, and the middle position between the front end and the rear end of the piezoelectric body 7 is simply pressed. Just By doing so, the tip of the piezoelectric body 7 remains movable when the piezoelectric body 7 is actuated, and the middle position between the rear end and the tip of the piezoelectric body 7 can be pressed. Therefore, a fulcrum is formed on the way, and since it is merely pressing the piezoelectric body 7, it is still movable. Furthermore, the spherical body 19 is not attached to the rear end portion of the piezoelectric body 7. This eliminates the need to inject the resin into the piezoelectric body 3 to fix the spherical body 19 and the rotating body 23, so that the cost can be reduced, and the piezoelectric body 7 can move freely without hindering its movement. Since the fulcrum is formed, the needle selection speed can be dramatically increased compared to the conventional piezoelectric type needle selection device and electromagnetic type needle selection device. It can have a device as well. However, since the one end of the finger is only connected to the tip of the piezoelectric body and the middle position between the rear end and the tip of the piezoelectric body 7 is only pushed, the piezoelectric body 7 will slide. Therefore, the ratio between the distance Y and the distance Z varies, and the stroke of the finger 9 is disturbed. Therefore, in the present invention, the other end of the piezoelectric body 7 is fixed in a device in which one end of the finger 9 is connected to the tip of the piezoelectric body 7 and the middle position of the piezoelectric body 7 is held down. Then, the piezoelectric body 7 is configured so as not to slide at one end of the finger 9, whereby the piezoelectric body 7 is prevented from sliding, and the distance Y and the distance Z are prevented. Since the ratio becomes constant, the stroke of the finger 9 can be prevented from being disturbed. In a second invention of the present invention, one end of the finger is connected to one end of the piezoelectric body, the other end of the piezoelectric body is movable without being fixed, and the middle position of the piezoelectric body is fixed. The piezoelectric actuator is characterized in that the piezoelectric body does not slide at one end of the finger. In principle, there is no difference from the first idea. It is movable without fixing the other end, and is fixed at an intermediate position so that the piezoelectric body does not slide at one end of the finger. As a result, the same operational effect as the first device can be obtained.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, one end of the finger 9 is connected to the tip of the piezoelectric body 7. In the above description, the piezoelectric body 7 has the piezoelectric element 13 bonded to both surfaces of the shim material 12, but the shim material 12 is omitted and the piezoelectric element 13 and the piezoelectric element 13 are bonded. It may be one or the like. In order to reduce the size of the device, the fingers 9 may be connected to the rectangular piezoelectric body 7 so as to be aligned (in the same direction). The fingers 9 are preferably formed by a method including the following steps (1) to (4). (1) Partial punching step of the pin hinge portion 26 forming hole of the finger forming substrate (2) Curling step of the partial punching portion of the above (1) (3) The finger forming substrate at the center of the finger forming substrate Bending step (4) Step of fixing the finger-forming substrates that are bent at the center and overlapped with each other. Specifically, first, a rectangular finger forming substrate is partially cut out in accordance with the form of the finger 9 and two pin hinge portion forming holes are formed at each of the left and right end portions of the substrate. Partial punching of 28 is performed, then each pin hinge portion forming hole (partial punching portion) 28 is rolled (curled), and then the bending process of the substrate is performed at the center of the finger forming substrate. The pin hinge portion 26 is formed by the arrangement of the curled partial punched portions, and the substrate is fixed. As a result, the weight-reduced finger 9 can be manufactured in a simple process. As described above, the pin 27 is inserted into the pin hinge portion 26 of the finger 9.

As shown in FIG. 1 (A), a plurality of projecting holding portions 30 are formed at appropriate intervals on the midway fulcrum portion 29 at an intermediate position of the piezoelectric body 7, and adjacent holding portions 30 are formed. The piezoelectric body 7 is interposed between the pressing portion 30 and the pressing portion 30. As shown in FIG. 1 (B), a protrusion 32 having a hole 31 is attached to the rear end of the piezoelectric body 7, and as shown in FIG. 1 (A), the protrusion 32 is attached to the piezoelectric body 7. It is fitted into the groove 21 of the mounting portion 20, and the bar 33 is inserted into the hole 31 as shown in FIGS. 1B and 1C, and the piezoelectric body 7 slides at one end of the finger 9. Fix it in that position so that it does not exist.

Next, an embodiment of the present invention will be further described with reference to FIG. As shown in FIG. 2, the protrusions 34 are formed at both ends of the piezoelectric body 7 at the middle position. A plurality of protrusion-shaped pressing portions 30 are formed at appropriate intervals on the midway fulcrum portion 24, and the piezoelectric body 7 is interposed between the adjacent pressing portions 30. As shown in FIG. 2C, a plurality of holes 35 are provided at appropriate intervals in the midway fulcrum portion 24, and as shown in FIG. The protrusion 34 is inserted into the hole 35 and the piezoelectric body 7 is fixed at the midway position.

FIG. 2D shows another embodiment, in which grooves 36 are formed at both ends of the piezoelectric body 7 at the middle position. A plurality of projecting holding portions 30 are formed at appropriate intervals on the fulcrum portion 24 on the way, and the piezoelectric body 7 is interposed between the holding portions 30 adjacent to each other. As shown in FIG. 2 (D), a plurality of protrusions 37 are provided at appropriate intervals on the midway fulcrum portion 24, and as shown in FIG. 2 (B), both end portions of the piezoelectric body 7 in the middle position are provided. The protrusion 37 is inserted into the groove 36, and the piezoelectric body 7 is fixed at the middle position.

Although not shown in these embodiments, one end of the finger 9 is connected to the tip of the piezoelectric body 7. Further, a spherical body 19 is attached to the rear end of the piezoelectric body 7, and the rear end of the piezoelectric body 7 to which the spherical body 19 is attached is fitted into the groove portion 21 of the piezoelectric body attaching portion 20 of the support body 8. The spherical portion of the spherical body 19 is allowed to rotate in the groove portion 21 of the piezoelectric body mounting portion 20, and accordingly, the rear end portion of the piezoelectric body 7 is made movable.

Although the invention made by the present invention has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say. The needle selection device according to the present invention can be applied to various knitting machines such as sock knitting machines. In the circular knitting machine, the needle plate, that is, the knitting cylinder, rotates with respect to the machine base of the circular knitting machine, and the needle selection device is fixedly provided on the machine base of the circular knitting machine. When the needle selection device according to the present invention is used in a circular knitting machine, the fingers of the knitting needles in the rotating knitting cylinder are operated when the individual fingers of the needle selection device fixed to the machine stand are operated. It is necessary to configure so as to contact the lower end of the bat or knitting needle. On the other hand, the needle selection device according to the present invention can also be used in a flat knitting machine. In a flat knitting machine, a needle plate is fixedly provided on the machine base of the flat knitting machine, and a slide including a needle selecting device and a yarn supplying device slides along the needle plate to form a knitted fabric. Since the knitting is carried out, when the slide slides, the tip of the finger of the needle selecting device is actuated to hit the finger butt of the knitting needle in the fixed needle plate or the lower end of the knitting needle. It must be configured to abut the jack finger butt located in contact.

The present invention can also be applied to a control device for a loom or the like that controls a control rod (held rod) in a jaguar device of a loom to enable pattern weaving such as jacquard weaving. The control device also operates by a piezoelectric method, and when a pulse is applied to the piezoelectric element 13 of the piezoelectric body 7 via the controller that stores the pattern knitting procedure, the piezoelectric body 7 performs a bending motion, Since the finger 9 is connected to the piezoelectric body 7, the finger 9 is operated. The control device is arranged in a vertical direction, and a finger 9 is connected to a lower portion of the piezoelectric body 7. At the middle position of the piezoelectric body 7, a plurality of projecting holding portions 30 are formed at appropriate intervals on the fulcrum portion 29, and the piezoelectric body 7 is interposed between the holding portions 30 adjacent to each other. Then, a protrusion 32 having a hole 31 is attached to the upper end of the piezoelectric body 7, the protrusion 32 is fitted into the groove 21 of the piezoelectric body attachment portion 20, and the bar 33 is inserted into the hole 31. Insert it. The bar 33 in the control device suspends the piezoelectric body, prevents the piezoelectric body 7 from sliding downward, and prevents the piezoelectric body 7 from sliding at one end of the finger 9. . The embodiment shown in FIG. 2 is similarly applied. A control rod for controlling warp yarns is connected to the lower portion of the finger 9 of the control device. However, in this case, the finger 9 is provided with a hook portion or a hole, and the control rod side is also provided with a hook portion or a hole. As the piezoelectric body 7 bends, the hook portion or hole of the finger 9 may or may not engage the control rod. When no pulse is applied to the piezoelectric element of the piezoelectric body 7, the finger 9 does not engage with the control rod and keeps the separated position, while in the opposite case, the finger 9 engages. Thus, the finger 9 is adapted to selectively hold the control rod, and the hook at the lower end of the control rod is connected to the heald of the loom and further to the warp yarn, The control rod is operatively linked to the heald to control the heald and control the warp thread. When the control rod stays on the finger 9, the control rod does not move downward, while in the opposite case, the control rod moves downward. This vertical movement allows the selection of the heald and the control of the warp thread. Is done. According to such a warp yarn device using a piezoelectric method, the response speed is high, the heat generation is small even when a high-cycle pulse is applied, and the speed is twice or more the rotation speed as compared with the conventionally known one using an electromagnet. With the loom, weaving can be performed.

[0016]

[Effect of device]

 As described above, according to the present invention, it is not necessary to inject the resin into the piezoelectric body to fix the spherical body or the rotating body. Therefore, the accuracy of the mounting position of the resin spherical body or the rotating body and the piezoelectric body does not matter. In addition, it does not require lubrication to prevent resin abrasion, further reduces cost, and because the piezoelectric body can move freely and does not interfere with its movement, the needle selection device by the conventional piezoelectric method is used. As compared with the conventional device, the needle selection speed can be remarkably faster than that of the electromagnetic type needle selection device, and a long life can be obtained similarly to the conventional device. Further, according to the present invention, the ratio of the distance Y and the distance Z related to the stroke of the finger becomes constant, so that the stroke of the finger can be prevented from being disturbed.

[Brief description of drawings]

FIG. 1A is a configuration diagram showing an embodiment of the present invention, and FIG.
Is a perspective view showing an embodiment of the present invention, (C) is a sectional view showing an embodiment of the present invention,

FIG. 2A is a configuration diagram of a piezoelectric body showing an embodiment of the present invention,
(B) is a plan view showing an embodiment of the present invention, (C) is an explanatory view showing an embodiment of the present invention, (D) is an explanatory view showing another embodiment of the present invention,

3A is a cross-sectional view of the main part of the needle selection device, FIG. 3B is an explanatory view of the main part of the needle selection device,

FIG. 4 is a block diagram of a needle selection device,

5A and 5B are operation explanatory views of the needle selection device,

FIG. 6 is a block diagram of a knitting machine,

[Explanation of Codes] 1 ... Knitting cylinder-2 ... Knitting needle 3 ... Needle selecting device 4 ... Controller 5 ... Thread 6 ... Bobbin 7 ... Piezoelectric body 8 ... Support 9 ... Finger 10 ... Stopper 11 ... Opening 12 ... Shim 13 ... Piezoelectric element 14 ... Lead wire 15 ... Needle selection jack 16 ... Butt 17 ... Butt for raising cam 18 ... Lifting cam 19 ... Spherical body 20 ... Piezoelectric body mounting portion 21 ... Groove portion 22 ... U-shaped groove 23 ... Rotating body 24 ... Rotating Body attachment part (halfway fulcrum part) 25 ... Finger support part 26 ... Pin hinge part 27 ... Pin 28 ... Pin hinge part forming hole (partial punching part) 29 ... Midway fulcrum part 30 ... -Holding part 31 ... Hole 32 ... Projection part 33 ... Bar 34 ... Projection Start 35 ... Hole 36 ... Groove 37 ... Projection

Claims (2)

[Scope of utility model registration request] 1. A piezoelectric body and a finger are provided, the piezoelectric body is operated to operate the finger, and the operation of the finger controls needle selection of a knitting needle of a knitting machine or control of a heald rod of a loom. A piezoelectric actuator, wherein one end of the finger is connected to one end of the piezoelectric body, the middle position of the piezoelectric body is held down, and the piezoelectric body is slidable at the one end of the finger, A piezoelectric actuator, wherein the other end of the piezoelectric body is fixed so that the piezoelectric body does not slide on one end of the finger. 2. A piezoelectric body and a finger are provided, and the piezoelectric body is actuated to actuate the finger, and the finger is actuated to select a knitting needle of a knitting machine or control a heald rod of a loom. A piezoelectric actuator, wherein one end of the finger is connected to one end of the piezoelectric body, the other end of the piezoelectric body is movable without being fixed, and the piezoelectric body slides at one end of the finger. In a possible piezoelectric actuator, a piezoelectric actuator is characterized in that a middle position of the piezoelectric body is fixed so that the piezoelectric body does not slide at one end of the finger.