JPH02277863A - Piezoelectric needle selecting device for knitting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a multilayer piezoelectric element that is incorporated into a circular knitting machine such as an electronic pattern circular knitting machine or a sock knitting machine. This invention relates to an incorporated piezoelectric needle selection device for knitting machines.

(Prior Art) A needle selection device for a knitting machine that has already been proposed and is incorporated into a circular knitting machine such as an electronic patterning circular knitting machine or a sock knitting machine is shown in FIGS. 9 and 10. (Utility Model Application No. 63-167187).

That is, as shown in FIGS. 9 and 10, a knitting machine cylinder 1 is rotatably provided on a base I of a circular knitting machine.
A large number of vertical grooves (needle grooves) 2 are formed in the axial direction on the outer periphery of the , and each vertical groove 2 has a jack 3 having a respective butt 3a for vertically moving a knitting needle (not shown). It is fitted so that it can slide freely. In addition, a box-shaped support frame 4 is fixed to the base (machine frame main body) I near the knitting machine cylinder 1 with bolts, and the back plate of this support frame 4 is 6, as shown in FIG. 10, each pair of flat plate-shaped piezoelectric elements 7.8 are cantilevered and arranged horizontally in the axial direction of the knitting machine cylinder 1. There is. Further, each free end of each piezoelectric element 7.8 forms a pair of upper and lower clamping parts 7as 8a having a semicircular arc shape, and these pair of upper and lower clamping parts 7a, 8a are connected to a plurality of needle selection levers. One end 9a of 9 is held between the top and bottom.

That is, a plurality of needle selection levers 9 are attached to the support frame 4 near the jack 3 having each of the butts 3a.
0, the needle selection lever 9 is pivotally mounted so as to be able to swing vertically, and one end 9a of this needle selection lever 9 is held between the above-mentioned clamping parts 7a and 8a from above and below, and the other end of this needle selection lever 9 is For example, a select finger 9b made of a hard material such as cemented carbide or fine ceramics is attached so as to selectively push each butt 3a of the jack 3. Further, on the support frame 4 near each holding portion of each piezoelectric element 7.8, a pair of upper and lower stoppers lla;
llb is formed to restrict the vertical movement range of each free end of each piezoelectric element 7.8.

Therefore, when the circular knitting machine is operated, the needle selection device for a knitting machine using each of the piezoelectric elements 7.8 described above can be used as the knitting machine cylinder 1 rotates at high speed. Jack 3 also rotates.

On the other hand, the pattern control device (not shown) of the circular knitting machine is equipped with
By applying a pulse signal to each of the piezoelectric elements 7 and 8 based on the pattern pattern signal inputted in advance, one piezoelectric element 7 is energized by an electric signal having a positive (+) resonant frequency.
．． The other piezoelectric element 8 alternately expands and contracts to produce flexural vibrations in the vertical direction, and the other piezoelectric element 8 alternately expands and contracts by the electric signal of the resonance frequency of the cathode (-) to produce flexural vibrations in the vertical direction.
These holding parts 7a and 8a move the needle selection lever 9 upward and downward around the bottle shaft 10, so that the selection finger 9b of the needle selection lever 9 moves each butt 3a of the jack 3. By selectively pushing and moving, knitting needles (not shown) are slid in the vertical direction, thereby creating a pattern in the merry and yarn knitting.

(Issue 8 to be solved by the invention) However, since the above-mentioned needle selection device for a knitting machine is composed of each extremely thin plate-shaped piezoelectric element 7.8, it is subject to operating stress over a long period of time. It is difficult to withstand vibrations, and there is a risk of breakage or breakage due to long-term use due to vibration.In addition, it is difficult to obtain a sufficient amount of displacement to move the bat from the selected position to the non-selected position. It lacks the holding force with the non-selected position, making it impossible to obtain an effective and appropriate high speed, resulting in unstable operation (chattering operation), causing "pattern pattern irregularity phenomenon", and making it difficult to improve quality. be.

The present invention has been made in view of the above-mentioned circumstances, and at the same time converts the electrical energy of each laminated piezoelectric element into mechanical energy, and at the same time expands and displaces the operation of this mechanical energy. The piezoelectric element is made to withstand high-speed operation, and the amount of displacement to move the bat from the selected position to the non-selected position is sufficiently expanded, and the expansion operation is made stable and reliable at high speed. An object of the present invention is to provide a piezoelectric needle selection device for a knitting machine that prevents the phenomenon of "disturbance of pattern output" and improves quality.

[Structure of the idea]

(Means and Effects for Solving the Problems) The present invention is characterized in that each jack is fitted into a knitting machine cylinder so as to move each knitting needle up and down, and each jack is connected to a needle selection lever provided near the knitting machine cylinder. In a circular knitting machine, a support frame is provided on a base near the knitting machine cylinder, and at least a pair of upper and lower holders are attached to a part of the support frame. Each hinge portion is formed in a part of the above-mentioned holding bodies that are arranged in parallel in the axial direction of the cylinder and located inside the above-mentioned support frame, and each support is formed on both the above-mentioned holding bodies beside each hinge portion. forming a section, and interposing each laminated piezoelectric element between each support section and each tip jaw section of the two holding bodies,
Each actuator and each magnet part are attached to each tip of the above-mentioned both holders so as to push the above-mentioned needle selection lever alternately, each stopper is provided on the outside of both the above-mentioned holders, and each of the above-mentioned laminated piezoelectric By applying pulse voltages to the elements alternately, the electrical energy of each laminated piezoelectric element is converted into mechanical energy, and at the same time, the action of this mechanical energy is expanded and displaced to alternately move the needle selection lever. 1,
Each of the laminated piezoelectric elements mentioned above is made to withstand high-speed operation, and the amount of displacement to move the bat from the selected position to the non-selected position is sufficiently expanded, and the expansion operation is stable and reliable at high speed. This is intended to prevent the phenomenon of irregular pattern development and improve quality.

(Example) Hereinafter, the present invention will be described with reference to an illustrated embodiment.

Note that the present invention includes the same constituent members as those in the above-mentioned specific example.
The same reference numerals will be used for explanation.

In FIGS. 1 to 7, reference numeral 1 denotes a knitting machine cylinder rotatably installed on a base (2) of a circular knitting machine. ) 2 are formed in the axial direction, and a jack 3 having each butt 3a is slidably fitted into each longitudinal groove 2 so as to move a knitting needle (not shown) up and down. or,
On the base (machine frame main body) I near the knitting machine cylinder 1, a box-shaped support frame 4 is fixed with bolts 5, and a back plate 6 of this support frame 4 is attached. As shown in FIGS. 2 to 7, at least a pair of upper and lower holders 20 and 21 are cantilevered and arranged horizontally in parallel with respect to the axial direction of the knitting machine cylinder 1, Both holding bodies 2
0.21 is provided so that the length of each attachment position can be adjusted with a nut 22 via an adjustment cylinder. Furthermore, as shown enlarged in FIGS. 4 and 6, each hinge portion 20a, 21a is provided with each notch in the middle of the holder 20.21 inside the back plate 6 of the support member 4. The holder 20.21 beside each hinge portion 20a121a is formed with a groove to serve as a fulcrum.
Each support portion 20b121b is formed to serve as a point of effort.

Furthermore, support jaws 20C121c are formed on the holders 20 and 21 beside the support portions 20b and 21b, and the image front end portions 20d of the holders 20 and 21 are formed with support jaws 20C121c.
, 21d are formed with respective tip jaws 2Qe, 21e. Further, between the respective tip jaws 20e, 21e and the respective supporting jaws 20c, 21c, there are lead wires 23a, 2.
The laminated piezoelectric elements 23, 24 having a diameter of 4a are interposed so as to be back to back to each other, and by alternately applying a pulse voltage to each laminated piezoelectric element 23, 24, they alternately expand and contract. And each of these laminated piezoelectric elements 2
The above-mentioned holder 20.21 that holds 3.24 focuses on each of the above-mentioned supporting parts 20b and 21b, and each of the above-mentioned hinge parts 20.
a, 21a are used as fulcrums to alternately swing vertically, and when the distance between the fulcrums of each of the hinge parts 20a, 21a and the point of force of each of the above-mentioned support parts 20b, 21b is "1", The distance between the fulcrum of each of the hinge portions 20a, 21a and each actuator 25.26, which will be described later, has an enlargement ratio of about 16 times, thereby enlarging the operating range of each actuator 25.26.

On the other hand, each actuator 25.26 is located at the image end portion of both the holders 20.21 and at each notch step.
It is threaded so as to be substantially perpendicular to the longitudinal direction of 21. Moreover, each magnet member 27.28 is embedded in the above-mentioned both holders 20.21 beside each of the actuators 25.26, and each end face of each of the magnet members 27.28 is connected to each of the above-mentioned actuators. 25 and 26, and are buried slightly inwardly. Furthermore, each stopper 29.30 coated with a vibration-absorbing material is provided on the support frame 4 on the outside of both the end portions 20d, 21d of both the holders 20.210.
The stoppers 29 and 21 are provided to restrict the range of swing of the stopper 21, and each of the stoppers 29 and 30 is designed to absorb impact noise during operation.

On the other hand, a plurality of needle selection levers 31 are pivotally attached to the support frame 4 near the jack 3 having the butt 3a so as to be swingable in the vertical direction by means of a pin shaft 32. One end 31a is connected to each of the actuators 27 and 28.
The needle selection lever 31
The other end 31b is attached so as to selectively push the bat 3a.

Hereinafter, the effects of the present invention will be explained.

Therefore, when the circular knitting machine is operated, the knitting machine cylinder 1 rotates at a high speed, and a large number of jacks 3 installed on the outer periphery of the knitting machine cylinder 1 also rotate.

On the other hand, the pattern control device (not shown) of the circular knitting machine is equipped with
By alternately applying a pulse signal to each of the laminated piezoelectric elements 23 and 24 based on the pattern pattern signal inputted in advance, one of the laminated piezoelectric elements 23 receives an electric signal of the positive (+) resonance frequency. As a result, the holding body 20 holding each of the laminated piezoelectric elements 23 and 24 expands and contracts alternately.
．． 21 swings vertically alternately using the support parts 20b, 21b as a point of effort and each hinge part 20a s 21a as a fulcrum, and as described above, each actuator 2
5 and 26 operate largely within the operating range due to the magnification ratio of approximately 16 times.

Note that at this time, the other laminated piezoelectric cable 24 is connected to the cathode (-
), and the magnet members 27 and 28 alternately attract the needle selection levers 31, so that the needle selection levers 31
2, and the other end (select finger) 31b of this needle selection lever 31 is connected to the jack 3.
By selectively pushing each batt 3a, knitting needles (not shown) are slid in the vertical direction, thereby creating a pattern in the stockinette knitting.

2, the present invention is configured to greatly operate the operating range of each of the actuators 25 and 26 at a magnification ratio of about 16 times, so it is not possible to increase the operation of the needle selection lever 31. can. In other words, each of the laminated piezoelectric elements 23.
The expansion/contraction movement (displacement) of each laminated piezoelectric element 23, 24 itself caused by alternately applying pulse signals to 24 is about 15 to 40 microns. 23. Utilizing the expansion and contraction movements of 24, both the holding bodies 20.21 are attached to their respective hinge parts 20a%2
1a, so each of the above actuators 2
The operating range of 5.26 can be expanded to a magnification ratio of about 16 times.

Next, in another embodiment of the present invention shown in FIG. 8, the laminated piezoelectric elements 23, 24 are provided face-to-face inwardly, and the positions of the hinge parts 20a121b are adjusted to the holding frame. 20.21, and has the same configuration as the specific example described above.

It goes without saying that the positions of each actuator and each magnet member of the present invention may be interchanged with each other.

〔Effect of the invention〕

As described above, according to the present invention, each jack is fitted into the knitting machine cylinder so as to move each knitting needle up and down, and each jack is selectively pushed by a needle selection lever provided near the knitting machine cylinder. In a circular knitting machine configured to move, a support frame is provided on a base near the knitting machine cylinder, and at least a pair of upper and lower holders is attached to a part of the support frame in the axial direction of the knitting machine cylinder. each hinge portion is formed in a part of both the above-mentioned holding bodies that are arranged in parallel toward the support crushing body and located inside the above-mentioned supporting crushing body, and each supporting portion is formed in both the above-mentioned holding bodies beside each of the hinge portions, Each laminated piezoelectric element is interposed between each of these supporting parts and each of the tip jaws of both of the above-mentioned holders, and each actuator and each magnet member are attached to each of the tips of both of the above-mentioned holders to connect the needle selection lever. The electrical energy of each of the laminated piezoelectric elements can be reduced by attaching them so that they can be pushed alternately, providing each stopper on the outside of both of the holding bodies, and applying a pulse voltage alternately to each of the laminated piezoelectric elements. At the same time as converting it into mechanical energy, the movement of this mechanical energy is expanded and displaced to alternately push the needle selection lever, so the amount of displacement to move the bat from the selected position to the non-selected position is Not only can it be sufficiently enlarged, but it can also perform a stable and reliable enlarging operation at high speed, which has excellent effects such as preventing irregularities in pattern placement and improving quality.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the main parts of the piezoelectric needle selection device for knitting machines of the present invention, FIG. 2 is a longitudinal sectional view of the same, FIG. 3 is a front view of the same, and FIG. Exploded slope views, FIGS. 5 to 7 are diagrams for explaining the present invention in detail, FIG. 8 is a diagram showing another embodiment of the present invention, and FIG. FIG. 10 is a plan view showing the main parts of the piezoelectric needle selection device for a knitting machine, and is a longitudinal cross-sectional view of the same. 1...knitting machine cylinder, 3...jack, 4...
Support frame body, 20.21... Holding body, 20 a s 2
1 a... Hinge part, 20b, 21b... Support part,
23.24...@5-layer piezoelectric element, 25.26...
Actuator, 27.28... Magnet member, 29.30...
Stopper, 31...needle selection lever

Claims (1)

[Claims] In a circular knitting machine, each jack is fitted into a knitting machine cylinder so as to move each knitting needle up and down, and each jack is selectively pushed by a needle selection lever provided near the knitting machine cylinder, A support frame is provided on a base near the knitting machine cylinder, and at least a pair of upper and lower holders are arranged side by side in a part of the support frame in the axial direction of the knitting machine cylinder, and the support frame Each hinge part is formed in a part of the above-mentioned both holding bodies located inside the body, each supporting part is formed in both the above-mentioned holding bodies beside each hinge part, and each of these supporting parts and the above-mentioned both holding bodies are formed. Each laminated piezoelectric element is interposed between each tip jaw portion, and each actuator and each magnet member are attached to each tip portion of both holders so as to alternately push the needle selection lever, A knitting machine characterized in that stoppers are provided on the outside of both of the holding bodies, and the needle selection lever is alternately pushed by alternately applying a pulse voltage to each of the laminated piezoelectric elements. piezoelectric needle selection device.