WO2023189041A1

WO2023189041A1 - Knotter device

Info

Publication number: WO2023189041A1
Application number: PCT/JP2023/006520
Authority: WO
Inventors: 大雅小松原; 元山口; 政裕 ▲高▼田; 基晴中嶋; 芳樹田端
Original assignee: 株式会社島精機製作所
Priority date: 2022-03-28
Filing date: 2023-02-22
Publication date: 2023-10-05

Abstract

Provided is a knotter device that can stably tie knots.　A yarn joining unit 20 includes: a yarn guide 23 capable of guiding old yarn 2b to a direction different than a stretching direction; a knitting needle 21 that hooks the old yarn 2b together with twisting the old yarn to form a twisted stitch 4, hooks another portion of the old yarn 2b guided by the yarn guide 23 to form a stitch 5 by passing the other portion through the twisted stitch 4 to one side, and passes a new yarn 2a guided by a yarn guide lever 14 through the stitch 5; a hook 22 around which the old yarn 2b is wound when the knitting needle 21 forms the stitch 5, and that can operate so as to release the winding; and a tensioner 27 and the yarn guide lever 14 which increase the tension of the old yarn 2b such that the stitch 5, through which the new yarn 2a has passed, passes through the twisted stitch 4 to the other side.

Description

knotter device

The present invention relates to a technique for a knotter device equipped with a yarn selection section and a yarn splicing section.

Conventionally, the technology of a knotter device equipped with a yarn selection section and a yarn splicing section is well known. By using a knotter device, it is possible to switch the thread in use to another thread of a different color, etc.

Patent Document 1 discloses a thread tying device that ties the terminal end of a cut first thread after a work is completed and the starting end of a second thread for the next work. In the above-mentioned thread tying device, the stitches are formed by the rotation of the knitting needle and the action of the latch without using a thread guide in the process of forming stitches for twisted stitches. There was a problem.

Japanese Patent Application Publication No. 2002-35460

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a knotter device that can stably perform knotting.

The problem to be solved by the present invention is as described above, and next, means for solving this problem will be explained.

That is, the knotter device according to the present invention is a knotter device that includes a yarn selection section and a yarn splicing section, and the yarn selection section includes a guide lever that guides new yarn supplied from a yarn source to the splicing section. The yarn splicing section includes a guide section that can guide the old yarn in a direction different from the stretching direction, and a guide section that hooks and twists the old yarn to form a twist, and the old yarn guided by the guide section. A knitting needle that hooks the other part of the yarn and passes the twisted stitch to one side to form a stitch, and passes the new yarn guided by the guide lever through the stitch, and when the knitting needle forms the stitch. A hook part operable to unwind the old yarn while the old yarn is being wound, and increasing the tension of the old yarn so that the stitch through which the new yarn is passed passes to the other side of the twisted line. It has a tension applying section.
With this configuration, it is possible to stably tie the knot.

Further, the relative timing of the release of the hook from wrapping around the old yarn and the increase in the tension applied to the old yarn by the tension applying section can be arbitrarily set.
With this configuration, it is possible to suppress the occurrence of thread breakage and poor thread tying.

Further, the hook portion is configured to be able to arbitrarily change the timing at which it is unwound with the old yarn.
By configuring in this way, it is possible to realize a more optimal thread knot depending on the thread.

Further, the hook portion has a pair of hook-shaped members in which the old yarn can be placed,
The knitting needle is configured to be movable back and forth between the pair of hook-shaped members and rotatable around an axis.
With this configuration, the formation of twisted stitches and the formation of subsequent stitches can be stably performed.

Further, the guide portion guides a portion of the old yarn downstream of the hook portion to a position facing the knitting needle via the hook portion.
With this configuration, the step of forming a stitch following a twisted stitch can be performed more stably.

Further, after the new yarn is passed through the stitch, a holding section capable of holding the old yarn on the upstream side of the stitch, and a holding section that can hold the old yarn by the holding section, A cutting section that cuts an unnecessary portion of the old yarn, and the tension applying section increases the tension of the old yarn after being cut by the cutting section.
With this configuration, it is possible to efficiently tie the old thread and the new thread.

Further, the tension applying section includes the guide section.
With this configuration, the guide portion serves multiple roles, resulting in a simple configuration.

Further, the knitting needle forms the twisted stitches multiple times.
With this configuration, the knot of the thread can be made more difficult to come undone.

As an effect of the present invention, the knot can be stably performed.

FIG. 1 is an upper left perspective view showing a knotter device according to a first embodiment of the present invention. (a) A schematic front view showing the knotter device. (b) A schematic left side view showing the knotter device in a state where yarns for splicing are being selected. (a) A schematic front view showing a state in which a selected thread is caught by a thread guide lever and guided rearward. (b) A schematic front view showing a state in which the thread in use is caught by the thread guide lever and guided to the front of the separator. The left front perspective view showing a thread splicing part. (a) A schematic plan sectional view showing the knitting needles, hooks, and yarn guides of the yarn splicing section. (b) A schematic left side view showing the knitting needles, hooks, and yarn guides of the yarn splicing section. FIG. 2 is a block diagram showing the configuration of a knotter device. A flowchart showing the thread splicing process. (a) A schematic plan sectional view showing a state in which the old thread is hooked on the hook. (b) A schematic plan sectional view showing a state in which the old thread is no longer wrapped around the hook. (a) A schematic left side sectional view showing a state where the old thread is hooked on the hook. (b) A schematic left side sectional view showing a state in which a buffer of old yarn is formed by the yarn guide. (c) A schematic left side sectional view showing a state where the knitting needle has entered between the upper hook and the lower hook. (a) A schematic left side sectional view showing a state in which the knitting needle has withdrawn from between the upper hook and the lower hook and carried the old yarn backward. (b) A schematic left side cross-sectional view showing a state in which the old thread has been twisted. (c) A schematic left side sectional view showing a state in which the knitting needle hooks the buffer portion of the old yarn. (a) A schematic left side sectional view showing a state in which stitches of old yarn are formed. (b) A schematic left side cross-sectional view showing a state in which the old thread is wound around the hook part of the lower hook. (a) A schematic left side cross-sectional view showing a state in which the new yarn is taken forward of the hook. (b) A schematic left side sectional view showing a state in which the new yarn is drawn into the stitches. (a) A schematic left side sectional view showing a state in which the cutter has cut the new thread and the old thread. (b) A schematic left side sectional view showing a state in which the new yarn has come off the knitting needle. (a) A schematic left side sectional view showing a state in which the new thread is twisted and pulled out to the front side of the eye. (b) A schematic left side sectional view showing a state in which the old thread and the new thread are spliced. (a) A schematic left side cross-sectional view showing a state in which the old yarn is twisted. (b) A schematic left side sectional view showing a state in which the knitting needle has entered between the upper hook and the lower hook. (c) A schematic left side sectional view showing a state in which the knitting needle has entered between the upper hook and the lower hook and has rotated half a turn. (a) A schematic left side sectional view showing a state in which the knitting needles have moved forward. (b) A schematic left side sectional view showing a state in which the knitting needle catches the old yarn during rotation. (c) A schematic left side cross-sectional view showing a state in which double twists are formed.

Below, the directions indicated by arrow U, arrow D, arrow F, arrow B, arrow L, and arrow R in the figures are defined as upward direction, downward direction, forward direction, backward direction, left direction, and right direction, respectively. I will explain. Further, in the drawings, illustrations of each component are appropriately omitted for simplification of illustration.

The knotter device 1 splices the yarn 2 currently in use in the knitting machine with a new yarn 2 wound around a yarn cone, which is a yarn source, by knotting. The knotter device 1 is arranged between a yarn source and a knitting machine. More specifically, a yarn source is arranged above the knotter device 1, and a knitting machine is arranged below the knotter device 1. In the knotter device 1, the yarn 2 is fed from the top to the bottom. Hereinafter, the upstream side in the yarn feeding direction will be referred to as the "upstream side", and the downstream side in the yarn feeding direction will be referred to as the "downstream side". The knotter device 1 includes a yarn selection section 10, a yarn splicing section 20, and a control section 30.

The yarn selection section 10 shown in FIGS. 1, 2(a), 6, etc. guides the yarn 2 selected from a plurality of yarns 2 supplied from a yarn source to the yarn splicing section 20. The yarn selection section 10 mainly includes a yarn selection plate 11, a yarn holder 12, a separator 13, a yarn guide lever 14, a first yarn presser 15, and a suction 16.

The yarn selection plate 11 is formed to be able to select one yarn 2 from a plurality of yarns 2 supplied from a yarn source. Note that the yarn selection board 11 can also simultaneously select two or more yarns 2 from a plurality of yarns 2 supplied from a yarn source. Hereinafter, the yarn 2 selected by the yarn selection board 11 will be referred to as "new yarn 2a," the yarn 2 currently in use in the knitting machine will be referred to as "old yarn 2b," and the yarns 2 other than old yarn 2b and new yarn 2a will be referred to as "waiting yarn 2a." thread 2c. A plurality of yarn selection plates 11 are arranged with the plate surfaces facing in the left-right direction. The plurality of thread selection boards 11 are arranged in a line in the left-right direction. The yarn selection plate 11 is provided so as to be swingable back and forth by an individually provided solenoid. The thread 2 is inserted through a ring 11a provided at the tip of the thread selection plate 11.

The yarn holder 12 is provided downstream of the yarn selection plate 11. The thread holder 12 is formed to be movable between a holding position where the thread 2 is held and a retracted position where the thread 2 is not held. The thread holder 12 is formed to be displaceable, for example, by pneumatic pressure. The thread holder 12 can simultaneously hold the vicinity of the tips of a plurality of threads 2 in the holding position. More specifically, the thread holder 12 can simultaneously hold a plurality of threads 2 other than the old thread 2b.

The separator 13 is arranged between the yarn selection plate 11 and the yarn holder 12 in the yarn feeding direction. The separator 13 is formed into a plate shape with the plate surface facing in the front-rear direction. The separator 13 can separate the old yarn 2b and the waiting yarn 2c. Specifically, the old yarn 2b is guided downward through the rear side of the separator 13. The yarn 2 on standby passes through the ring 11a at the tip of the yarn selection plate 11, passes through the front side of the separator 13, and is held by the yarn holder 12.

The yarn guide lever 14 is formed to be able to guide the new yarn 2a selected by the yarn selection plate 11 to the yarn splicing section 20. The thread guide lever 14 is provided so as to be rotatable around an axis extending in the front-rear direction. The thread guide lever 14 is driven, for example, by a motor. As shown in FIG. 3(a), the thread guide lever 14 can catch the new thread 2a at its tip 14a during rotation. A side protrusion 14b is provided at the middle portion of the thread guide lever 14. As shown in FIG. 3(a), the thread guide lever 14 can catch the old thread 2b on the side protrusion 14b during rotation.

The first thread presser 15 is provided on the front side of the separator 13 and upstream of the thread holder 12. The first thread presser 15 is formed to be movable between a presser position where the thread 2 is held so as not to move and a retracted position where the thread 2 is not pressed. The first yarn presser 15 is formed to be able to be displaced by, for example, air pressure. At the holding position, the first thread presser 15 can press the vicinity of the tips of the threads other than the new thread 2a, that is, the old thread 2b and the waiting thread 2c.

The suction 16 is provided downstream of the thread holder 12. The suction 16 is formed to be able to suction and hold the tip of the thread 2. Further, the suction 16 is formed to be able to suction and remove thread waste generated during the thread splicing process.

When one yarn selection plate 11 is selected in the yarn selection section 10 configured in this way, the selected yarn selection plate 11 rotates to select the selected yarn selection plate 11, as shown in FIG. 2(b). The new yarn 2a, which is the yarn 2 inserted through the ring 11a of No. 11, is pulled rearward. When the thread guide lever 14 is rotated counterclockwise in this state, as shown in FIG. The thread 2b is hooked onto the side protrusion 14b. When the yarn guide lever 14 is further rotated counterclockwise when viewed from the front, the new yarn 2a is guided to the rear side of the separator 13, and the old yarn 2b is guided to the front side of the separator 13, as shown in FIG. 3(b). You will be guided to. In this way, the yarn selection section 10 can select one new yarn 2a from the plurality of yarns 2 supplied from the yarn source and guide the selected new yarn 2a to the yarn splicing section 20.

The yarn splicing section 20 shown in FIGS. 1, 4 to 6, etc. splices the new yarn 2a and the old yarn 2b selected by the yarn selection section 10 by tying them together. The yarn splicing section 20 is provided downstream of the yarn selection section 10. The yarn splicing section 20 mainly includes a knitting needle 21, a hook 22, a yarn guide 23, a cutter 24, a second yarn presser 25, a third yarn presser 26, and a tensioner 27.

The knitting needles 21 shown in FIGS. 1, 4, and 5 are used to form stitches when piecing yarns. As the knitting needle 21, for example, a latch needle is used. The knitting needles 21 are provided with their longitudinal directions facing in the front-back direction. The knitting needles 21 are provided so as to be movable in the front-back direction. The knitting needles 21 are rotatably provided around an axis extending in the front-rear direction. As shown in FIG. 5(a), the front end of the knitting needle 21 is formed with a hook portion 21a on which the old yarn 2b and the new yarn 2a can be hooked. The hook portion 21a is formed in a hook shape.

The hook 22 shown in FIGS. 1, 4, and 5 supports the old yarn 2b in a straight line. The old yarn 2b is wound around the hook 22 when the knitting needle 21 forms a stitch. The hook 22 is provided in front of the knitting needle 21. The hook 22 is provided so as to be movable in the left-right direction. The hook 22 has a pair of hook-shaped members on which the old yarn 2b can be placed. Hereinafter, the upper hook-shaped member will be referred to as upper hook 22a, and the lower hook-shaped member will be referred to as lower hook 22b. The upper hook 22a and the lower hook 22b are arranged with an interval in the vertical direction. The upper hook 22a is arranged above the knitting needles 21. The lower hook 22b is arranged below the knitting needles 21. The upper hook 22a and the lower hook 22b each have a main body portion 28 and a hook portion 29.

The main body portion 28 is provided with its longitudinal direction facing in the left-right direction. The hook portion 29 is formed at the left end portion of the main body portion 28 . The hook portion 29 is formed in a hook shape that bends backward and rightward from the left end portion of the main body portion 28 . The upper hook 22a and the lower hook 22b are formed in the hook portion 29 so that the old thread 2b can be hooked thereon.

By forming the hook 22 in this way, the knitting needle 21 is provided so as to be movable between the upper hook 22a and the lower hook 22b by moving back and forth.

The yarn guide 23 shown in FIGS. 1, 4, and 5 is capable of guiding the old yarn 2b in a direction different from the stretching direction. The thread guide 23 is formed in a substantially L-shape. More specifically, the thread guide 23 has a first portion 23a whose longitudinal direction is oriented generally in the vertical direction, and a second portion 23b extending rightward from the lower end of the first portion 23a. The upper end portion of the first portion 23a is fixed to a gear 23A rotatable around an axis extending in the left-right direction. The first portion 23a is provided to the left of the knitting needles 21 and hooks 22. The second portion 23b is formed to extend further to the right than the old thread 2b. Moreover, the thread guide 23 can apply tension to the old thread 2b by rotating.

The cutter 24 shown in FIGS. 1 and 4 cuts unnecessary parts of the new thread 2a and the old thread 2b while the old thread 2b is held by a second thread presser 25, which will be described later. The cutter 24 is disposed upstream of the hook 22 and is formed to be able to cut a portion of the new yarn 2a and the old yarn 2b upstream of the knot. The cutter 24 is movable between a cutting position where the new yarn 2a and the old yarn 2b are cut, and a retracted position where the old yarn 2b and the new yarn 2a are not cut.

The second thread presser 25 shown in FIGS. 1 and 4 is for holding down the old thread 2b. The second thread presser 25 is arranged downstream of the cutter 24. The second thread presser 25 is arranged upstream of the knitting needles 21 and hooks 22. The second thread presser 25 is formed to be movable between a presser position where the thread 2 is held so as not to move and a retracted position where the thread 2 is not pressed. The second thread presser 25 is formed to be able to be displaced by, for example, air pressure. The second thread presser 25 can press a portion of the old thread 2b upstream of the knot at the presser position. 1 and 4, the cutter 24 is shown in the cutting position and the second thread presser 25 is in the retracted position, but in reality, the second thread presser 25 is in the retracted position. When the cutter 24 is in the holding position, the cutter 24 is in the cutting position.

The third thread presser 26 shown in FIGS. 1 and 4 is for holding down the old thread 2b. The third thread presser 26 is arranged downstream of the second thread presser 25. The third thread presser 26 is arranged downstream of the knitting needles 21 and hooks 22. The third thread presser 26 is formed to be movable between a presser position where the thread 2 is held so as not to move and a retracted position where the thread 2 is not pressed. The third yarn presser 26 is formed to be able to be displaced by, for example, air pressure. The third thread presser 26 can press the portion of the old thread 2b on the downstream side of the knot at the presser position.

The tensioner 27 applies tension to the old yarn 2b. The tensioner 27 is configured to be movable between a biased position where tension is applied to the old thread 2b by a spring and a retreated position where no tension is applied to the old thread 2b.

The control section 30 shown in FIG. 6 controls the operations of the yarn selection section 10 and the yarn splicing section 20. The control unit 30 includes a storage unit such as a RAM, ROM, and HDD, and an arithmetic processing unit such as a CPU. The control unit 30 can appropriately control the timing of operation of each component of the yarn selection unit 10 and the yarn splicing unit 20. The control unit 30 can operate each component in cooperation with the knitting machine, and can perform yarn splicing based on knitting data of the knitting machine, for example.

Hereinafter, the operation of each member of the knotter device 1 during yarn splicing will be explained using FIGS. 7 to 14.

First, in step S1 shown in FIG. 7, the old thread 2b is hooked onto the hook 22. Specifically, as shown in FIG. 8(a), the hook 22 moves to the right. As a result, the hook 22 hooks the old yarn 2b at the hook portion 29, as shown in FIG. 9(a).

Next, in step S2, the twist 4 of the old yarn 2b is formed. Specifically, as shown in FIG. 9(b), the thread guide 23 rotates to bring the portion of the old thread 2b downstream of the hook 22 forward. As a result, a bent portion of the old yarn 2b is formed in front of the knitting needle 21. Hereinafter, the bent portion of the old yarn 2b will be referred to as a buffer 3. The buffer 3 extends from below the lower hook 22b to the front of the knitting needle 21, and then bends so as to extend downward again toward the third thread presser 26 side.

Next, the hook 22 moves to the right and pulls the old yarn 2b further to the right. Next, as shown in FIG. 9(c), the knitting needle 21 moves forward and enters between the upper hook 22a and the lower hook 22b. After the hook 22 moves to the left, as shown in FIG. 10(a), the knitting needle 21 moves backward and exits from between the upper hook 22a and the lower hook 22b, thereby removing the old yarn 2b. Catch it and take it to the back. Next, as shown in FIG. 10(b), the knitting needle 21 rotates half a turn, thereby twisting the old yarn 2b to form a loop-shaped twist 4.

Next, in step S3, stitches 5 of the old yarn 2b are formed. Specifically, as shown in FIG. 10(c), the knitting needle 21 moves forward, and the hook portion 21a hooks the buffer 3 portion of the old yarn 2b. Next, as shown in FIG. 11(a), the knitting needle 21 moves backward and exits from between the upper hook 22a and the lower hook 22b, and passes the old yarn 2b through the twisted stitch 4, thereby creating a stitch. form 5. At this time, the old yarn 2b is initially wrapped around the main body part 28 of the lower hook 22b, but as the hook 22 moves slightly to the right and the knitting needle 21 pulls the old yarn 2b backward, As shown in FIG. 11(b), the old yarn 2b is wound around the hook portion 29 of the lower hook 22b.

Thereafter, the thread guide 23 turns in the direction opposite to the arrow shown in FIG. 5(b) and returns to its original position. Further, the second thread presser 25 is moved to the presser position, thereby pressing the portion of the old thread 2b on the upstream side of the hook 22.

Next, in step S4, the new yarn 2a is drawn into the stitch 5. Specifically, as shown in FIG. 12(a), after the knitting needle 21 moves forward, the thread guide lever 14 of the thread selection section 10 is rotated as shown in FIGS. 3(a) and 3(b). By moving, the new yarn 2a is brought forward of the hook 22. Next, as shown in FIG. 12(b), the knitting needle 21 hooks the new yarn 2a at the hook portion 21a and moves backward to pass the new yarn 2a through the stitches 5. The thread guide lever 14 then returns to the original position shown in FIG. 2(a).

Next, in step S5, the winding of the old yarn 2b around the hook 22 is released. Specifically, as shown in FIG. 8(b), as the hook 22 moves to the left, the portion around which the old yarn 2b is wound comes off the lower hook 22b.

Next, in step S6, tension is applied to the old yarn 2b and the new yarn 2a. Specifically, by moving the cutter 24 to the cutting position, the cutter 24 cuts the portions of the new yarn 2a and the old yarn 2b above the hook 22, as shown in FIG. Displace. Next, the knitting needle 21 moves backward and pulls the new yarn 2a caught on the hook 21a backward, thereby pulling the cut end of the new yarn 2a toward the stitch 5 side. As the knitting needle 21 moves further backward, as shown in FIG. 13(b), the cut end of the new yarn 2a passes through the stitch 5 to the rear side, and the new yarn 2a passes through the hooked part of the knitting needle 21. It comes off from 21a.

Next, with the part of the old yarn 2b upstream of the hook 22 being held down by the second yarn presser 25, the old yarn 2b is pulled downstream by the tension of the tensioner 27. As a result, as shown in FIG. 14(a), the stitch 5 and the new yarn 2a passed through the stitch 5 are pulled out through the twisted stitch 4 to the front side of the twisted stitch 4. Next, the third yarn presser 26 is moved to the presser position to press the portion of the old yarn 2b downstream of the hook 22. Then, as shown in FIG. 5(b), the thread guide 23 rotates and hooks the old thread 2b, thereby applying tension to the old thread 2b and the new thread 2a in the direction of tightening the knot, as shown in FIG. 14(b). will be granted. Furthermore, the third thread presser 26 is moved to the retracted position, and tension is applied to the old thread 2b by the tensioner 27, etc., so that the knot is completed and the old thread 2b and the new thread 2a are spliced. Ru.

As described above, in the knotter device 1 according to the present embodiment, by tying the old yarn 2b and the new yarn 2a, the knot can be made smaller compared to the case of tying the old yarn 2b and the new yarn 2a. resistance can be reduced. Also, unlike a splicer, which connects fibers at the end of the yarn by untwisting and intertwining them, even if the color of the old yarn 2b and the color of the new yarn 2a are different from each other, the seams of the yarns do not bleed. can be suppressed.

Note that when the new yarn 2a is a stretchable yarn such as an elastic yarn, the position of the new yarn 2a (for example, stitch 5 and Cutting with the cutter 24 and pulling of the new yarn 2a with the knitting needle 21 are performed while holding down the position (between the tip 14a of the yarn guide lever 14 and the position near the stitch 5) with another pressing member (not shown). Thereby, when the new thread 2a is cut by the cutter 24, it is possible to suppress the new thread 2a, which has been released from the increased tension, from coming off from the knot. Further, the presser member is released after the knot is tightened by the thread guide 23.

In the knotter device 1 according to the present embodiment, each component of the yarn selection section 10 and the yarn splicing section 20 does not operate mechanically in conjunction with each other, but operates individually. Therefore, the operation timing of each component of the yarn selection section 10 and the yarn splicing section 20 can be individually controlled by the control section 30.

Therefore, depending on the ease of breakage of the old yarn 2b and the new yarn 2a and the degree of surface friction, the hook 22 can be unwound around the old yarn 2b, and the tensioner 27 and the thread guide lever 14 can be used to unwind the old yarn 2b. The relative timing of the increase in tension can be set arbitrarily.

For example, if the surfaces of the old yarn 2b and the new yarn 2a are relatively non-slip, the stitch 5 passing through the new yarn 2a cannot pass through the twisted stitch 4 to the rear side, and a knot is not formed properly. It may not be possible. In order to prevent this, the timing at which the old thread 2b is unwound around the lower hook 22b may be delayed. For example, while applying tension to the old yarn 2b and the new yarn 2a, the old yarn 2b may be wound around the lower hook 22b for a while. As a result, the size of the twist stitch 4 can be maintained in a large state even while the stitch 5 through which the new yarn 2a is passed is pulled out to the front side of the twist stitch 4. It can be made easier to pass through eye 4.

On the other hand, if the surfaces of the old yarn 2b and the new yarn 2a are relatively smooth, the stitch 5 through which the new yarn 2a is passed is pulled too much in front of the twisted stitch 4, causing the twisted stitch 4 to turn inside out and the new yarn 2a may become entangled with the old thread 2b. In order to prevent this, the timing at which the old yarn 2b is unwound around the lower hook 22b may be advanced. For example, between FIG. 12(a) and FIG. 12(b), that is, before drawing the new yarn 2a into the stitch 5, the winding of the old yarn 2b around the lower hook 22b may be released. As a result, the size of the twisted stitch 4 becomes smaller, so that the stitch 5 through which the new yarn 2a is passed can be prevented from being pulled too far to the rear side of the twisted stitch 4.

In this way, the timing for unwinding the hook 22 from wrapping around the old yarn 2b can be arbitrarily set in response to an increase in the tension applied to the old yarn 2b by the tensioner 27 and the yarn guide 23. Therefore, it is possible to suppress the occurrence of thread breakage and poor thread tying.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and appropriate changes can be made within the scope of the technical idea of the invention described in the claims. .

For example, in the present embodiment, the knitting needles 21 have a single twist 4, but may have multiple twists. Hereinafter, a method of forming multiple twists 4 will be explained.

As shown in FIG. 15(a), when the knitting needle 21 rotates half a turn, the old yarn 2b is twisted and a loop-shaped twist 4 is formed. Next, as shown in FIG. 15(b), the knitting needle 21 moves forward to the extent that the latch does not pass through the twisted stitch 4, and enters between the upper hook 22a and the lower hook 22b.

Next, as shown in FIG. 15(c), the knitting needle 21 makes a half turn while entering between the upper hook 22a and the lower hook 22b. Next, as shown in FIG. 16(a), the knitting needles 21 move backward.

Next, as shown in FIG. 16(b), the knitting needles 21 rotate in the same direction as before. The knitting needle 21 hooks the old yarn 2b at the hook portion 21a during rotation. When the knitting needle 21 rotates half a turn from the state shown in FIG. 16(a), the old yarn 2b is wound twice around the knitting needle 21, as shown in FIG. 16(c). Thereby, the twist 4 can be formed twice.

Thereby, the knot between the old thread 2b and the new thread 2a can be made more difficult to come undone. Note that by repeating the steps shown in FIGS. 15 and 16, it is also possible to form three or more twists 4.

The present invention can be applied to a knotter device that includes a yarn selection section and a yarn splicing section.

1 Knotter device 10 Yarn selection part 14 Yarn guide lever 20 Yarn splicing part 21 Knitting needle 22 Hook 23 Yarn guide 24 Cutter 25 Second thread presser 26 Third thread presser 27 Tensioner

Claims

A knotter device comprising a yarn selection section and a yarn splicing section,
The yarn selection section is
a guide lever for guiding the new yarn supplied from the yarn source to the yarn splicing section;
The splicing part is
a guide section that can guide the old yarn in a direction different from the stretching direction;
The old yarn is hooked and twisted to form a twisted stitch, the other part of the old yarn guided by the guide section is hooked and the twisted stitch is passed to one side to form a stitch, and the stitch is guided by the guide lever. a knitting needle that passes the new yarn through the stitches;
a hook portion that is operable to wrap around the old yarn when the knitting needle forms the stitch and to unwind the yarn;
a tension applying section that increases the tension of the old yarn so that the stitch passing through the new yarn passes through the twisted stitch on the other side;
Knotter device.
The relative timing of the unwinding of the hook part around the old yarn and the increase in the tension applied to the old yarn by the tension applying part can be arbitrarily set;
A knotter device according to claim 1.
The hook portion is configured to be able to arbitrarily change the timing at which it is unwound with the old yarn.
The knotter device according to claim 1 or claim 2.
The hook portion has a pair of hook-shaped members in which the old yarn can be placed,
The knitting needle is configured to be movable back and forth between the pair of hook-shaped members and rotatable around an axis.
A knotter device according to any one of claims 1 to 3.
The guide section guides a portion of the old yarn downstream of the hook section to a position facing the knitting needle via the hook section.
A knotter device according to any one of claims 1 to 4.
a holding part capable of holding the old yarn on the upstream side of the stitch after the new yarn is passed through the stitch;
a cutting section that cuts unnecessary parts of the new yarn and the old yarn while the old yarn is held by the holding section;
Equipped with
The tension applying section is
increasing the tension of the old yarn after cutting by the cutting section;
A knotter device according to any one of claims 1 to 5.
The tension applying section includes the guide section.
A knotter device according to any one of claims 1 to 6.
The knitting needle forms the twisted stitches multiple times,
A knotter device according to any one of claims 1 to 7.