JP2003278059A - Needle selector for knitting machine controlling bound motion of finger and method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an apparatus with which a finger collides against the frame of a needle selector in a shaking motion with the speed-up of the needle selector of a knitting machine, makes a bound motion and is liable to cause a needle selection mistake, however, such a bound motion is controlled and the problem is eliminated. <P>SOLUTION: A bound control member 50 is rotatably supported on the shake supporting shaft 18 of the finger 30 shaking in cooperation with a piezoelectric material 7 and a finger shaking lever 38 is extended from the finger 30 in parallel with the supporting shaft 18. The finger shaking lever 38 is connected to a groove 52 in a loose fit state at a position separated from the supporting shaft 18 of the bound control member 50. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle selecting device for a knitting machine, and more particularly to a needle selecting device such as an opening of a frame of a needle selecting device when a finger swings around a support shaft due to a bending motion of a piezoelectric body. The present invention relates to a needle selecting device for a knitting machine capable of suppressing collision and bouncing, and a method for suppressing bouncing motion of fingers.

[0002]

2. Description of the Related Art In a circular knitting machine or a flat knitting machine, vertical movement of a knitting needle is selected based on a knitting procedure stored in a storage device such as a floppy disk to knit a knitted fabric having a desired knitting structure. Various needle selection devices are used to select the vertical movement of the knitting needles.

Therefore, prior to explaining the needle selecting device of the present invention, an outline of the needle selecting operation in a knitting machine will be described below based on a circular knitting machine schematically shown in FIGS. 6 and 7.

FIG. 6 is a schematic perspective view illustrating a basic knitting mechanism of a circular knitting machine. As shown in FIG. 6, the circular knitting machine has a knitting cylinder 1 that rotates in the direction indicated by arrow A. On the peripheral surface of the knitting cylinder 1, a plurality of longitudinal grooves (not shown) are provided along the longitudinal axis thereof, and the knitting needle 2 is swingably arranged in the longitudinal groove. Below the knitting needle 2, a needle selection jack 12 is normally arranged so as to be able to come in contact with below the knitting needle 2. On the other hand, below the knitting cylinder 1, a cylinder-shaped cam stand 15a is disposed in a stationary state, and on the upper part of the cam stand 15a, a plurality of raising cams 15 having predetermined intervals are formed. There is.

The basic principle of knitting will be briefly described.
Each knitting needle 2 on the rotating knitting cylinder 1
When the raising cam 15 pushes the needle 2 upward through the needle selection jack 12, as a result, the knitting needle 2 projects from the upper surface of the knitting cylinder 1. By supplying the thread 5 taken out from the thread bobbin 6 to the hook of the projecting knitting needle 2, a loop of the thread is formed. Then, one knit is formed by lowering the knitting needle 2 by a known mechanism (not shown). Therefore, it is possible to control the formation of a stitch by advancing or lowering the knitting needle 2 or advancing to the next knitting step so as not to form the stitch, thereby knitting a desired knitted fabric. be able to. In order to give such an operation to the knitting needle, in the knitting machine, the needle selection jack 12 is usually arranged so as to contact the lower part of the knitting needle 2. Then, the needle selection jack 3 is operated by using the needle selection device 3 that operates based on the information from the controller 4 that has a storage device that stores the knitting procedure.
The vertical movement of the knitting needle is controlled by selectively engaging the 2 and the raising cam 15.

Next, referring to FIGS. 7A and 7B showing the relationship among the knitting needle 2, the needle selection jack 12, and the needle selection device 3, a piezoelectric body is used as a bending motion generating member of the needle selection device. The case of use will be described below. In addition, (A) of FIG.
(B) is a schematic diagram for easy understanding of the operation of the needle selection device.

The piezoelectric body can be curved as shown in FIG. 7A or curved opposite to that shown in FIG. 7A depending on the method of applying voltage. Fingers 9 are arranged in cooperation with the tip of the piezoelectric body 7.
In FIGS. 7A and 7B, the piezoelectric body 7, the finger 9, and the raising cam 15 are positioned within the plane of the drawing, and the knitting needle 2 and the needle selection jack 12 are shown together with the knitting cylinder 1 (not shown). The circular motion is performed from above to below (or vice versa). The needle selection jack 12 is a fulcrum 1
Bat 1 for swinging around 2a and for needle selection
3 (upper) and a raising cam butt 14 (lower) are provided so as to project laterally from the needle selection jack 12 as shown.

When the piezoelectric body 7 is curved as shown in FIG. 7 (A), the needle 9 and the finger 9 of the needle selecting jack 12 that makes a circular motion collide with the finger 9. As a result, the needle selection jack 12 is pushed out clockwise around the fulcrum 12a, and as a result, the raising cam butt 14 of the needle selection jack 12 is pushed.
Can no longer engage the lifting cam 15. Therefore, the needle selection jack 12 is not pushed upward by the raising cam 15, and as a result, the knitting needle 2 is not pushed upward.

On the other hand, when the piezoelectric body 7 is curved as shown in FIG. 7B, the finger 9 at the tip of the piezoelectric body 7 is selected by the needle selection jack 12 which moves circularly together with the knitting cylinder 1. It does not collide with the needle butt 13. Therefore, the needle selection jack 12 is maintained in the vertical posture, and as a result, the raising cam butt 14 and the raising cam 15 at the lower end of the needle selection jack 12 are engaged. Therefore, the needle selection jack 12 is pushed upward along the inclined surface of the raising cam 15, and the knitting needle 2 is also pushed upward accordingly.

Reference numeral 22 is shown in FIGS. 7 (A) and 7 (B).
The member indicated by is a finger rotation stopper formed by a part of the frame of the needle selecting device, and by appropriately determining the position of the member 22, the finger 9 is surely engaged with the needle selecting butt 13. Thus, the finger 9 plays a role of preventing the finger 9 from flowing beyond the contact with the needle selecting butt 13. It should be noted that in a single needle selecting device, a plurality of needle selecting elements composed of the above-described piezoelectric body and fingers are arranged.

By selectively engaging the needle selecting butt 13 of the needle selecting jack 12 with the finger 9 at the tip of the piezoelectric body 7, the knitting needle 2 can be moved upward as desired. It is possible to knit a knitted fabric having an arbitrary knitting structure.

FIG. 8 shows the relationship between the piezoelectric body and the fingers in this piezoelectric needle selecting device. As shown in FIG. 8, a finger 9 is movably arranged on a piezoelectric body 7 having a bimorph type piezoelectric element, electric power is applied to the piezoelectric element 7 to operate the finger 9, and the operation of the finger 9 causes knitting. Select the knitting needles of the machine (more specifically, the needle selection jack 12
Knitting a knitted fabric having a predetermined knitting structure. The rear end of the piezoelectric body 7 is movably supported in the recess 20 of the frame 8 via a spherical body, that is, a rotating body 19. The tip end of the piezoelectric body 7 is movably connected to the U-shaped groove 17 (hereinafter, slit 17) at the rear end of the finger 9 via the rotating body 16. Further, a predetermined position between the rear end portion and the front end portion of the piezoelectric body 7 is sandwiched and arranged by the rotating body 21 rotatably attached to the frame 8.

As shown in FIG. 8, an intermediate portion 9b of the finger 9 is supported by the support shaft 18 on the frame 8, and when the piezoelectric body 7 makes a curved movement, the movement of the finger 9 causes the rear end of the finger 9 (piezoelectric body). The engaging portion) 9a is moved up and down.
As a result, the finger 9 swings around the support shaft 18, swings the support portion 9c of the finger 9 protruding through the opening 10 of the frame 8, and as a result, the butt contact portion 9
Swing d. The upward movement of the knitting needle 2 is selected by swinging the butt contact portion 9d.

[0014]

In the needle selecting device of the conventional knitting machine, the fingers repeatedly swing at high speed in the opening 10 of the frame of the needle selecting device (see FIG. 8). At that time, the finger sometimes collides with the finger contact portion 11a or 11b of the opening 10 and bounces, the amplitude gradually decreases, and the finger stops at a predetermined position. When the finger swing stopper 25 is provided as shown in FIG. 7b, the finger swings against the stopper 25 and bounces. Thus, when the finger bounces during the swinging operation, the finger is displaced from its stop position, and the timing of the finger contacting the needle selection jack, which should be performed originally, is deviated, resulting in a needle selection error.

In order to prevent such a bouncing movement of the finger, conventionally, methods such as increasing the precision of the component parts of the needle selecting device and the positional precision of the finger, or applying a force directly to the movement of the finger from the outside have been taken. Was there. However, such a method causes problems such as wear of each component of the needle selection device and an increase in manufacturing cost.

The present invention solves the above problems of the needle selecting device of a known knitting machine, and provides an excellent bouncing motion suppressing method and a needle selecting device of a knitting machine which can carry out the method with a simple structure. The purpose is to do.

[0017]

In order to achieve the above-mentioned object, a method for restraining a finger bouncing motion of a needle selecting device for a knitting machine according to the present invention is a bending motion generating member such as a piezoelectric body and a bending motion generating member. The present invention relates to a needle selecting device of a knitting machine, which comprises at least one needle selecting element composed of a finger selecting finger that swings in cooperation with each other, and a frame accommodating the needle selecting element. A rear portion is supported by the frame so as to be swingable about a provided support shaft, and forms a rear portion that extends rearward from the support shaft of the finger until it engages with the front end of the motion generating member, and is forward of the support shaft of the finger. Forms a front portion that extends through the opening provided in the frame to the butt contact portion at the tip, and when the finger repeatedly swings, delays from the time when the finger starts the swinging motion. A reverse force against the swing direction when its addition to the fingers, which comprises suppressing the bouncing motion of the fingers. In addition, as referred to in this specification,
The rear means the direction toward the knitting cylinder as the front, and the direction away from the knitting cylinder as the rear.

Further, in the above method, it is more preferable to apply a force in the opposite direction to the finger by utilizing the delay of the inertial force of the bounce restraining member provided so as to be supported on the support shaft of the finger.

A preferred needle selecting device of a knitting machine for carrying out the above-mentioned method of the present invention comprises a bending motion generating member such as a piezoelectric body and a needle for selecting a needle that swings in cooperation with the bending motion generating member. At least one needle selecting element and a frame for accommodating the needle selecting element, the finger is supported by the frame so as to be swingable about a support shaft provided at an intermediate position, and the finger is supported. A rear portion extending rearward from the shaft extends until it engages with the front end of the motion generating member, and a front portion of the finger supporting shaft passes through an opening provided in the frame to a butt contact portion at the front end. A knitting machine needle selecting device forming an extending front portion, wherein one end is rotatably supported by a support shaft of the finger, and extends forward from the one end along the longitudinal axis of the finger and at its front end. Engage with fingers in loose fit That bound suppression member is characterized by being provided at least one.

Further, as one mode of the bounce restraint material, the band restraint member is a flat plate-like member, and has a hole into which a supporting shaft of a finger is inserted at one end thereof, and swings at the other front end thereof. It is preferable to provide a passive portion that receives the fingers in a loosely fitted state. Further, a bar-shaped member extending laterally from the hole into which the support shaft of the finger is inserted is provided at a position closer to the butt contact portion, and the finger is loosely fitted to receive the movement of the bar-shaped member caused by the swinging motion of the finger. It is preferable to provide a passive portion, which is preferably a groove, on the bounce suppressing member.

As another preferred embodiment of the bounce restraint member, the bounce restraint member is a member having a U-shaped cross section, and a front portion of the finger has a rectangular opening portion which can be inserted in a loosely fitted state. A central portion and two extending from both ends of the central portion in a direction perpendicular to the central portion and parallel to each other
Preferably, the two legs are provided with holes at their ends remote from the center of the two legs for pivotal support by the support shafts of the fingers.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the accompanying drawings showing an embodiment of the present invention.

FIG. 1 is a perspective view showing an example of a needle selecting device for a knitting machine which suppresses a bouncing motion of fingers according to the present embodiment. The needle selecting device for a knitting machine shown in FIG. 1 includes the inventor of the present invention, and the applicant is the same applicant as the present application 2001
Patent Application No. 2001-117394 filed on April 16, 2014
It was implemented based on the needle selection module finger proposed in No. Although the frame 8 having the opening 10 is omitted in FIG. 1 for the sake of clarity, the fingers 30 are placed at the supporting portions 34 of the frame 30 as can be easily understood from FIG. 8 showing a conventional example. 8 protrudes from the opening 10.

That is, FIG. 1 and FIG.
In the needle selecting device according to the first embodiment shown in FIG. 3, a module finger 30 in which a finger member 31 and a finger holding member 40 are combined is used. The finger member 31 includes a butt contact portion 33 having a butt contact surface 32 at the tip and a support portion 34 extending in a rod shape from the butt contact portion 33.
Below the reference numeral 4, the finger swing bar 38 is provided with a finger member 31.
In the plane of, the right and left extend perpendicularly to the longitudinal axis of the support portion 34. Two protrusions (not shown) are provided below the support portion 34, and the two protrusions are useful for combination with a finger holding member 40 described later.

As shown in FIGS. 1 and 2, the finger holding member 40 has a rotation support portion 4 for accommodating an upper connecting portion 41 and a support shaft 18 (see FIG. 8) for supporting the rotation of the fingers.
3 and the piezoelectric body engaging portion 45 having the slit 44 that receives the movement transmitted from the piezoelectric body 7. Further, the connecting portion 41 is provided with a recessed portion for accommodating the protruding portion provided on the finger member 31 and an insertion type recessed portion for accommodating the insertion type protruding portion. By combining the above, the finger member 31 and the finger holding member 40 are integrally combined to form a module finger.

In this module finger 30, the finger member 31 is preferably made of a durable metal, while the finger holding member 40 is made of plastic injection molding, and these two members may be used in combination depending on the application. It has the advantage that it can respond quickly to a wide variety of fingers. Since the present application is a separate invention from the module finger, detailed description will be omitted. However, Japanese Patent Application 2001-
In contrast to the module finger proposed in No. 117394, in the module finger of the present application, the finger swing bar 38
Is provided only. The bounce restraint member of the present invention may be provided on a conventionally known integral finger, which is not a module finger.

In the needle selecting device for a knitting machine for suppressing the finger bouncing motion according to the present embodiment, a flat plate-shaped bouncing suppressing member 50 is oscillated on the finger member 31 at one end of the support shaft 18, as shown in FIGS. It is engaged with the bar 38 in a loosely fitted state. The bounce restraint member 50 is a flat plate-shaped member 51 as shown in FIG. 3, and restrains the bounce of the finger due to the deviation of the inertia with respect to the finger 30 as described later. It is preferred to use a large member and thus have a lumpy shape as shown. However, one end (downward in FIG. 3) has a hole 53 for being rotatably supported by the support shaft 18, and a passive portion for accommodating the finger rocking bar 38 of the finger member 31 in a loosely fitted state, that is, It has a groove 52.

The loose fitting state referred to here is the groove 5 in FIG.
This means that the width L1 of the finger rocking bar 38a (shown by the broken line) is smaller than the width L2 of 2. With such a structure, when the finger 30 swings about the support shaft 18 as shown by an arrow B in FIG. 1, that is, the finger swing bar 38 is in the groove 52 as shown by an arrow C in FIG. When swinging, the timing at which the finger swing bar 38 contacts the wall surface of the groove 52 is always delayed from the start of swinging the finger 30.

Therefore, at least a part of the swinging energy of the finger 30 has a large mass in the bounce suppressing member 5.
It is consumed to overcome the inertia force of 0 and rotate, and the finger 30 may stop without contacting the finger contact surface of the opening 10 of the frame 8 or, even if contacting, without bouncing. it can. In other words, the inertial force of the bounce restraint member 50 can be used to restrain the bounce that has occurred during finger swing. Therefore, when the needle selection device is operated, the finger is brought into contact with the butt 13 of the needle selection jack 12 at a predetermined timing, and as a result, it is possible to eliminate the occurrence of a needle selection error.

The shape and size of the bounce restraint member 50 shown in FIGS. 1 and 3 are merely examples, and the shape, size, material and the like are the most effective for eliminating the occurrence of needle selection error. The shape, size, material, etc. may be selected. In the first embodiment shown in FIGS. 1 and 3, the bounce restraint member 50 is provided only on one side of the finger swing bar 38, but it may be provided on both sides.

Another embodiment of the present invention will be described with reference to FIGS. 4 and 5. Finger 9 used in this embodiment
Is a conventionally known three-point-supported integral type finger illustrated in FIG. 8, and the bounce restraint member 60 is a member having a U-shaped cross section as shown in FIG. As will be easily understood with reference to FIG. 8, the support shaft 18 is the frame 8 of the needle selecting device of the knitting machine.
The supporting portion 9c of the finger 9 is supported by (only partly shown by a broken line in FIG. 4) and projects from the opening 10 (the opening 10 of the frame 8 is not shown in FIG. 4).

As shown in FIGS. 4 and 5, the bounce restraining member 60 has a central portion 6 having a rectangular opening portion 65 into which the front portion including the finger supporting portion 9c can be inserted in a loosely fitted state.
1 and two leg portions 62, 6 extending from both ends of the central portion 61 substantially perpendicularly to the central portion and substantially parallel to each other.
3, and the holes 64a and 64b for rotatably supporting the support shaft 18 of the finger are provided at the ends of the two legs 62 and 63 apart from the central portion 61. Side walls 65a and 65b are provided on both sides of the opening portion 65 of the central portion 61 so that the fingers 9 (shown by broken lines) abut when swinging.

The bouncing restraint member 60 shown in FIG. 5 allows the fingers 9 to pass through the opening 8 of the bounding restraint member 60 in a loosely fitted state with respect to the frame 8 of the needle selecting device, and then the support shaft 18 to the finger 8. 9 and the hole 64 of the bounce restraint member 60
It is assembled by rotatably inserting into a and 64b.

The operation of the bounce restraint member 60 shown in FIGS. 4 and 5 will be described below with reference to the opening 10 of the frame 8 and the support portion 9c of the finger 9. When the finger 9 swings in the direction of arrow D in FIG. 4, the support portion 9c, which is the front portion of the finger 9, has the opening 1 of the frame 8 shown in FIG.
It swings up and down within 0. In the needle selection device of the present application, as shown in FIG. 4, the support portion 9c of the finger 9 is the bounce restraint member 60.
It is inserted in the opening portion 65 of FIG. That is, as shown in FIG. 5C, the opening 65 is larger than the cross section of the finger supporting portion 9c, and the bounce suppressing member 60 is not formed.
There is a gap between the finger support portion 9c on at least one side of the opening side walls 65a and 65b.

With the above structure, when the finger support portion 9c swings as shown by the arrow D in FIG. 4, the timing at which the finger support shaft 9c contacts the opening side walls 65a and 65b is always determined from the start of swinging of the finger 30. Be late. For this reason,
At least a part of the swinging energy of the finger 9 is consumed for overcoming the inertial force of the bounce restraining member 60 having a large mass to rotate the bounding restraining member 60, and the finger 9 is used for the frame 8.
It is possible to stop without contacting the finger contact surface of the opening 10 or even if contact is made without bouncing. In other words, the inertial force of the bounce restraint member 60 can be used to restrain the bounce that has occurred during the finger swing. Therefore, when the needle selection device is operated, the finger is brought into contact with the butt 13 of the needle selection jack 12 at a predetermined timing, and as a result, it is possible to eliminate the occurrence of a needle selection error.

In order to suppress the finger bouncing motion in the needle selecting device of the knitting machine of the present invention, a force is applied to the finger in a direction opposite to the rocking direction after the finger starts the rocking motion. Just add it. The position for applying the force in the opposite direction may be any position as long as it is a finger, and may be any position on the longitudinal axis of the piezoelectric element that swings in cooperation with the finger in some cases. However, in order to properly restrain the fingers from bouncing, it is preferable to apply a force in the opposite direction at a position close to the bad contact portion of the fingers.

To apply a force in the opposite direction to the fingers, see FIG.
It is preferable to utilize the inertial force of the bounce restraint member provided so as to be supported on the support shaft of the finger as described with reference to FIGS. 3 and 4 or 5. However, the present invention is not limited to this method, and an external force in the opposite direction may be directly applied.

[0038]

As described above, the means for suppressing the bouncing motion of the finger in the needle selecting device for a knitting machine according to the present invention is delayed from the time when the finger starts the rocking motion, and is delayed with respect to the rocking direction at that time. Since a force in the opposite direction is applied to the fingers, the bouncing movement of the fingers can be suppressed with a simple mechanism, and as a result, mistakes in needle selection can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a needle selecting device for a knitting machine that suppresses a bouncing motion of fingers according to an embodiment of the present invention.

FIG. 2 is a view showing an example of a module finger used in the needle selection device shown in FIG. 1, (A) being a front view,
(B) is a side view.

FIG. 3 is a diagram showing an example of a bounding motion suppressing member used in the needle selection device shown in FIG. 1, (A) being a front view;
(B) is a side view.

FIG. 4 is a partially cutaway perspective view showing another example of the needle selecting device for the knitting machine that suppresses the bouncing motion of the finger according to the embodiment of the present invention.

5 is a diagram showing an example of a bounding motion suppressing member used in the needle selection device shown in FIG. 4, (A) being a front view;
(B) and (B ') are side views and (C) is a plan view.

FIG. 6 is a schematic perspective view of the entire knitting machine for explaining the knitting function of the knitting machine.

FIG. 7 is a view for explaining the knitting function of the knitting machine, which is (A)
FIG. 4B is a diagram showing a state in which the fingers of the needle selection device are engaged with the butt of the needle selection jack, and FIG. 7B is a diagram showing a state in which the fingers are not engaged with the bat.

FIG. 8 is a side sectional view showing an operation relationship between the piezoelectric body and the fingers in the needle selection device of the knitting machine.

[Explanation of symbols]

1 knitting cylinder 2 knitting needles 3 Needle selection device 4 controller 5 threads 6 bobbins 7 Piezoelectric body 8 frames 9 fingers 9a Piezoelectric body engaging part 9b Butt contact part 9c support 10 openings 11a, 11b Finger contact part 12 needle selection jack 13 Bat 14 Lifting cam butt 15 lifting cam 15a Cam stand 16, 19, 21 Spherical body 17 U-shaped groove 18 Support shaft 20 recess 22 Finger swing stopper 30 module fingers 31 Finger member 32 Butt contact surface 33 Butt contact part 34 Support 38 Finger swing bar 40 Finger holding member 41 Connection 43 Rotation support 44 slits 45 Piezoelectric body engaging part 50, 60 Bound restraint member 51 Flat member 52 groove 53 holes 61 central part 62, 63 legs 64a, 64b holes 65 opening 65a, 65b Side wall of opening

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tadashi Segami             4047-3 Tomita, Yorii Town, Osato District, Saitama Prefecture F-term (reference) 4L054 AA01 CA01 EA00

Claims (7)

[Claims] 1. A needle selection element including a bending motion generating member such as a piezoelectric body and a needle for finger selection that swings in cooperation with the bending motion generation member, and a frame for housing the needle selection element. Until the finger is supported by the frame so as to be swingable about a support shaft provided at an intermediate position, and the rear of the finger is engaged with the front end of the motion generating member. A needle selecting device for a knitting machine that forms a rear portion that extends, and a front portion that extends from the support shaft of the finger through the opening provided in the frame to the butt contact portion at the tip. At least one bound restraint member is rotatably supported by the support shaft of the finger, extends forward from the one end along the longitudinal axis of the finger, and engages with the finger at its front end in a loose fit state. Be Suppressing knitting machine needle selection device bouncing movement of the fingers, characterized in that there. 2. The band restraining member is a flat plate-shaped member, and has a hole into which the support shaft is inserted at one end thereof, and a passively receiving finger that swings at the other end in front thereof in a loosely fitted state. The needle selecting device for a knitting machine according to claim 1, wherein a portion is provided. 3. The finger has an insertion hole into which the support shaft is inserted, and a rod-shaped member that extends laterally from the insertion hole at a position closer to the butt contact portion. 3. The needle selecting device for a knitting machine according to claim 2, wherein the passive portion receives the movement of the rod-shaped member caused by the swinging movement of the finger in a loosely fitted state. 4. The needle selecting device for a knitting machine according to claim 3, wherein the passive portion is a groove. 5. The bounce restraining member is a member having a U-shaped cross section, and a front portion of the finger has a central portion having a rectangular opening portion which can be inserted in a loosely fitted state, and both ends of the central portion. From the center portion of the two legs extending in a direction perpendicular to the central portion and parallel to each other, and the bounce restraining member is rotatably supported by the support shaft at the end portions apart from the central portion of the two legs. The knitting machine needle selecting device according to claim 1, wherein a hole for forming the needle is provided. 6. At least one needle selection element comprising a bending motion generation member such as a piezoelectric body and a needle selection finger that swings in cooperation with the bending motion generation member, and a frame for accommodating the needle selection element. The finger is supported by the frame so as to be swingable about a support shaft provided at an intermediate position, and extends rearward from the support shaft of the finger until it engages with the front end of the motion generating member. A finger of a needle selecting device for a knitting machine, which forms a rear portion and forms a front portion that extends from a support shaft of the finger to a butt abutting portion of the tip through an opening formed in the frame. When the finger repeatedly swings, a force in a direction opposite to the swinging direction at that time is applied to the finger when the finger repeatedly swings. Bound luck of fingers Method of suppressing bouncing movement of the fingers, characterized in that to suppress. 7. The force in the opposite direction is applied to the finger by utilizing a delay in inertial force of a bounce restraining member provided so as to be supported on a support shaft of the finger. Bing movement restraint method for fingers.