TWI551747B - Structure of similar double chain stitch and multi-needle sewing machine for forming the stitch - Google Patents

Description

Quasi-double-strand stitch construction and multi-needle sewing machine forming the stitch

The present invention relates to a pseudo-double-chain lower-knit stitch structure formed by a plurality of parallel-shaped bright needle lines formed by penetrating a cloth and a decorative line formed by a back surface of the cloth and each of the open stitches, and the formation of the stitches Needle sewing machine.

The double-chain undercarriage stitch structure of the stitch specifications 406 and 407 specified by JIS L 0120 is a combination of 2 or 3 parallel needle stitches formed by penetrating the cloth and combined with the respective needle stitches on the back side of the cloth. a decorative wire, the lower decorative thread is looped through the needle stitches of each column, and one side thereof is zigzagly hung on the needle coils of each column to be formed, and The needle loop of the needle thread row emerges from the lower loop, and is formed in a form of a needle loop formed in the front and rear of the needle loop.

The multi-needle double-strand sewing machine for forming the double-chain undergarment stitch structure has two or three needles that are held in a direction orthogonal to the feed and are interlocked with the main shaft. Up and down movement; and a curved needle, which carries the lower trim line, and performs an elliptical motion formed by the reciprocating motion in the direction of the arrangement of the needles and the forward and backward movement in the feeding direction in synchronization with the movement of the upper and lower movements of the needle. The needle coil formed by each of the needles is hooked.

Patent Documents 1 and 2 disclose the double-chain underwear stitch structure and the multi-needle double-chain slit type sewing machine.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2000-218071

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2010-233904

It is an object of the present invention to provide a novel pseudo-double-chain undercarriage stitch structure which is more flexible than the conventional double-chain undergarment stitch structure, and a multi-needle sewing machine which forms the stitch structure.

The pseudo-double-chain undercarriage stitch structure of the invention of claim 1 is composed of a plurality of parallel needle-shaped needle lines formed by penetrating the cloth and a decorative line combined with the yarn on the back side of the cloth and each column. The lower trimming line is a needle coil formed by the stitches of the needle thread of one end from the end of each row, and the needle thread is formed by the needle thread of the front end of the thread loop hanging at the other end. Outside the circle, it is not hung on the next needle coil in the other needles of the other columns, and the wire from the one end of the needle coil is divided into front and rear and becomes the loop through the front and rear stitches. form.

The invention of claim 2 is a multi-needle sewing machine for forming a pseudo-double-chain undercarriage stitch structure of the invention of claim 1 of the invention, which is composed of the following members, namely: a plurality of needles The needles are placed in parallel with the feed and are moved up and down in conjunction with the main shaft; the curved needles are held by the lower thread and are arranged only toward the needle in synchronization with the upper and lower movements of the needle. Reciprocating movement of the direction, and hooking the needle coil formed by the needle rising from the bottom dead center during the movement, and detaching from the needle coil during the returning movement; and the hook piece, the main The shaft reciprocates in conjunction with each other, and engages with the lower trim line of the end portion of the looper that protrudes through the needle coil of each needle during the forward movement, and extends to the front side of the feed direction and is formed to form the next bright line. A wire loop into which only the most proximal needle of the plurality of needles is lowered.

The pseudo-double-chain undercarriage stitch structure of the invention of claim 1 is passed through the respective stitches while maintaining the loops of the respective stitches, unlike the conventional double-chain undercarriage stitch structure. In this way, the needle coils which are hung in the respective rows to be formed by the one side of the thread under the respective stitches are bent, but in the bright needle thread at one end, the stitches of the front and rear stitches are not hung on the line of the lower trimming line. The ring is connected by only one lower trim line. Therefore, the lower trimming line has a weaker bonding force to the front and rear bright needle threads, and therefore, the stitches are easily stretched.

According to the multi-needle sewing machine of the invention of the second aspect of the patent application, the pseudo double-chain underwear stitch structure of the invention of claim 1 can be obtained.

In addition, the looper of the multi-needle sewing machine which forms the conventional double-chain lower-cut sewing machine is configured to reciprocate in a direction orthogonal to the feed direction (left-right movement) and reciprocate in the feed direction. The elliptical orbit formed by the combination of (moving back and forth) moves, but in the multi-needle sewing machine of the present invention, the curved needles only reciprocate toward the direction in which the needles are arranged, and it is not necessary to bend the curved needles toward the feeding direction. The mechanism of the movement can greatly simplify the curved needle driving mechanism and realize the high-speed driving of the curved needle.

[Formation of the Invention]

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a view showing the appearance of a flat chain stitch sewing machine having a horizontal tube 2, which is different from the known multi-needle double-strand sewing machine except for a mechanism such as a upper looper 1 which is fitted with a top thread on a bright needle thread. The appearance structure of the sewing machine shown in Fig. 1 is not a characteristic part of the present invention, and the description thereof will be omitted.

Fig. 2 shows the internal structure of the horizontal tube 2, which is composed of the following members: a curved needle 3 which carries a lower trim line and which is orthogonal to the feed only by a reciprocating mechanism (not shown) The direction is reciprocating linear motion, and the needle coil formed by the needle rising from the bottom dead center is hooked when going to the action, and is separated from the needle coil during the returning motion; and the hook piece 4 is obtained by The actuating mechanism reciprocates in the horizontal direction, and is engaged with the lower trim line passing through the eyelet 3a of the looper 3 by the hook groove 4a formed at the tip end (see FIG. 4) during the forward movement, and is captured. The lower trim line is extended toward the front side in the feeding direction; as shown in the second to fourth figures, the actuating mechanism of the hook piece 4 is constituted by the following members: an eccentric wheel 7 extending from the machine base 5 To the horizontal cylinder 2 and supported by the horizontal shaft, and fixed at one end of the horizontal cylinder 2 of the shaft 6 rotating in conjunction with the main shaft; the lever 9, which is pivotally supported by the sewing machine casing 8 and reciprocally rotates in the vertical plane a connecting rod 11 connecting the intermediate portion of the eccentric 7 and the rod 9; and a horizontal lever 12, the intermediate portion of which is supported by the sewing machine casing 8 , one end is connected to the upper end of the lever 9 , and reciprocally rotates in a horizontal plane by the reciprocal rotation of the lever 9 in the vertical plane; and the hook piece 4 is fixed by a fixing screw (the fixing screw shown in FIG. 2 ) The shaft portion 13 is fixed to the other end of the horizontal lever 12.

The hook piece 4 fixed to the horizontal lever 12 is reciprocally rotated in the horizontal plane together with the horizontal lever 12 as described above, but in order to adjust the radius of rotation of the front end, a long hole 14 is formed in the mounting base of the hook piece 4, The position adjustment is performed so that the horizontal lever 12 can be in the range of the long hole 14.

The lever 9 is formed with a long hole 16 in the longitudinal direction at the intermediate portion, and the connecting rod 11 is adjustably positioned by the fixing screw 17 passing through the long hole 16. The lever 9 and the hook can be adjusted by adjusting the joint position up and down. The amount of reciprocal rotation of the sheet 4.

The looper 3 of the embodiment is configured to be capable of reciprocating linear motion, but may be a rocking shaft that reciprocally rotates in conjunction with the lower shaft 6 in the feed direction in the lower portion of the inner tube. The shaft is rocked to reciprocate the looper 3 in a vertical plane.

In addition, the hook piece 4 may be reciprocating linear motion by any reciprocating motion mechanism without reciprocating rotation, and the reciprocating rotation is not limited by the illustrated actuating mechanism, and any other action may be used. The mechanism rotates back and forth. In short, an arbitrarily constructed actuating mechanism can be used as long as the hook piece 4 can be reciprocated.

Next, a description will be given of a pseudo double-chain stitch structure formed by the sewing machine. The stitch structure shown in Figs. 5 to 14 shows a stitch structure formed by using three needles 19a, 19b, and 19c without using an upper trim line, which is composed of three rows of parallel needle stitches. 23a, 23b, 23c and a lower trim line 20 joined to each of the rows of the needle thread 23a, 23b, 23c on the back side of the fabric, wherein the needle thread 23a, 23b, 23c is the first formed by the needle 19a at the right end. The column, the needle thread 23a of the column at the one end of the right end, the second column formed by the needle 19b in the middle, the needle thread 23b of the middle row, and the third column formed by the needle 19c of the left end, that is, the left end The other end of the column is formed by a needle thread 23c. Specifically, among the needle stitches 23a, 23b, and 23c of the respective rows, the needle coils 24a _n , 24b _n , and 24c _n which are simultaneously formed at the nth position by the lower ends of the needles 19a, 19b, and 19c are looped. The wire loop 20 _n of the trimming wire 20 passing through the respective stitch coils 24a _n , 24b _n , 24c _n emerges from the third row of the stitch coil 24c _{n and} then only hangs in the same third column. The needle coil, that is, the needle coil 24c _n+1 formed at the n+1th position, is not hung on the needle coil formed by the _n+ 1th order of the first column and the second column. Then, as from under one end of a pin array of the coils 24a _n out trim line is constructed as before and after each stitch by playing enclosure 24a _n-1 and 24a _{n + 1} into the front and rear.

Next, a method of forming the stitch structure will be described in the order of the fifth to fourteenth drawings. In the figure, an arrow F indicates a feeding direction.

First, as shown in Fig. 5, the right needle 19a that holds the needle thread 21a, the needle 19b that carries the needle thread 21b, and the left needle 19c that carries the needle thread 21c are lowered and are at the bottom dead center, and are held under The looper 3 of the trimming line 20 is in the state of the right dead point. When the needles 19a, 19b, 19c rise and the looper 3 advances to the left of the figure (toward the action), the front end of the looper is firstly operated by the right machine. The stitch 22a of the needle thread 21a formed by the needle 19a is hooked (Fig. 6). When the needles 19a, 19b, 19c are further raised, and the looper 3 is advanced, the looper 3 passes through the loop 22a of the needle thread 21a together with the lower trim line 20, and the looper front end pairs the needle thread formed by the center needle 19b. The coil 22b of 21b is hooked (Fig. 7).

When the needles 19a, 19b, 19c are further raised and the looper 3 is advanced, the looper 3 passes through the stitch 22a of the needle thread 21a and the needle thread together with the lower trim line 20. In the coil 22b of 21b, the end of the looper hooks the stitch 22c of the needle thread 21c formed by the left needle 19c (Fig. 8).

When the needles 19a, 19b, and 19c continue to rise further, the tip end portion of the looper passes through the coil 22c of the needle thread 21c together with the lower trim wire 20, and the hook piece 4 reciprocally rotated in the horizontal plane goes toward the front side in the feed direction. Go to action (forward) (Figure 9). When the needles 19a, 19b, 19c reach the top dead center and the looper 3 reaches the left dead point, the hook groove 4a at the front end of the hook piece captures the stitch passing through the needle thread between the needle eye 3a and the coil 22c at the front end of the looper needle. The lower trim wires 20 of 22a, 22b, and 22c are pressed in front of the feed direction (Fig. 10).

When the needles 19a, 19b, and 19c are lowered from the top dead center and the looper 3 is retracted from the left dead point, the hook piece 4 continues to move toward the state in which the lower trim line 20 is caught in the hook groove 4a. When the lower loop 20 of the stitch 22c of the needle thread 21c emerges from the looper 3 toward the front side in the feed direction F, the front end loop 20L _{n+1 is formed} , and the lowered left needle 19c enters the loop. Then, the intermediate needle 19b and the right needle 19a are lowered to the front side of the loop 20 under the loop 22a of the looper 3a from which the looper 3a of the looper 3 is to be formed (Fig. 11). Fig. 12 shows that each of the needles 19a, 19b, and 19c is further lowered, the looper 3 continues to retreat, and the hook piece 4 continues to move toward the front in the feed direction.

When the respective needles 19a, 19b, and 19c continue to descend, and the hook piece 4 is returned and retracted, the distal end portion of the looper 3 that has been retracted is separated from the coil 22c of the needle thread 21c (Fig. 13).

Fig. 14 shows a state in which the respective needles 19a, 19b, and 19c are further lowered, and the hook piece 4 is retracted to be detached from the wire loop 20a, and the looper 3 is retracted from the stitch 22b of the needle thread 21b, and in this state, the lower trim is The wire loop 20L _{n+1 of the} wire 20 is hung on the left needle 19c, and the front end portion of the looper is hung on the coil 22a of the needle thread 21a. Then, the stitch formation process after FIG. 5 is repeatedly performed.

The stitch structure of the present embodiment has a structure similar to that of the conventional double-chain undercut stitch structure, but the lower trim line 20 is looped through each other in comparison with the conventional double-chain undercut stitch structure. The needle threads 21a, 21b, and 21c are not bent on one side of the stitches of the needle stitches to be formed in each of the rows, but are in a state in which the two wires pass through the coils 22a, 22b, and 22c, and are formed by the center needle 19b. The stitch 22b of the bright needle thread is not connected to the stitch of the bright needle line to be formed by the lower trim wire 20, and the stitch 22 is formed by a line connecting the coil 22 to be formed by one lower trim wire 20. In the track structure, the bonding force between the front and rear loops of the lower trim line 20 is weak, so that the stitches are easily stretched in the front and rear directions in the feed direction.

The above embodiment shows a stitch structure formed by a sewing machine having the same appearance as that of a three-needle flat-stitch sewing machine, but may be formed by other multi-needle sewing machines such as a two-needle sewing machine or a four-needle sewing machine. Or the same pseudo-double-strand stitch composed of four needle threads, and even if a multi-needle double-strand sewing machine is used, a pseudo-double-strand stitch having the same structure can be formed, and further, an upper ornament can be used. The line forms a pseudo-flat chain stitch in which the lower trim line and the needle thread are combined in the manner shown in this embodiment.

The flat chain stitch sewing machine or the double chain stitch sewing machine also has the upper looper 1 or the looper 3 reciprocating from the left to the right opposite to the sewing machine, and the left sewing machine is formed into a left-right symmetrical shape with the sewing machine. Sewing machine. The present invention can also be applied to such a left sewing machine, whereby the stitch formed by the left sewing machine is such that the loop of the front end of the lower trim line 28 is hung on the needle thread 21a. On the coil 22a, the coil 22 before and after the needle thread 21c is connected in a form of a lower trim line 20.

1‧‧‧Upper bend

2‧‧‧ horizontal tube

3‧‧‧bend needle

3a‧‧‧ pinhole

4‧‧‧ hook piece

4a‧‧‧ Hook

5‧‧‧ machine base

6‧‧‧ Lower shaft

7‧‧‧Eccentric wheel

8‧‧‧Sewing machine casing

9‧‧‧Leverage

11‧‧‧ Connecting rod

12‧‧‧Horizontal leverage

13‧‧‧ fixing screws

14‧‧‧ long hole

16‧‧‧ long hole

17‧‧‧ fixing screws

19a, 19b, 19c‧‧‧ needles

20‧‧‧Bottom line

20 _n ‧‧‧ wire loop

21a, 21b, 21c‧‧ needles

22a, 22b, 22c‧‧‧ coil

23a, 23b, 23c‧‧‧ needle thread

24a _n , 24b _n , 24c _n ‧ ‧ needle coil

24c _n+1 ‧‧ needle coil

24a _n-1 , 24a _n+1 ‧‧ needle

Fig. 1 is a perspective view showing the appearance of a flat interlocking sewing machine.

Fig. 2 is a plan view showing a looper and a hook piece disposed in a horizontal tube of the sewing machine shown in Fig. 1.

Fig. 3 is a side view showing the actuating mechanism of the hook piece shown in Fig. 2.

Figure 4 is an exploded perspective view of the actuation mechanism of the hook piece.

Figure 5 is a perspective view showing the stitch formation process.

Figure 6 is a perspective view showing the next stitch forming process.

Figure 7 is a perspective view showing the next stitch formation process.

Figure 8 is a perspective view showing the next stitch formation process.

Figure 9 is a perspective view showing the next stitch formation process.

Figure 10 is a perspective view showing the next stitch formation process.

Figure 11 is a perspective view showing the next stitch formation process.

Figure 12 is a perspective view showing the next stitch formation process.

Figure 13 is a perspective view showing the next stitch formation process.

Figure 14 is a perspective view showing the next stitch formation process.

3‧‧‧bend needle

4‧‧‧ hook piece

19a, 19b, 19c‧‧‧ needles

20‧‧‧Bottom line

20 _n ‧‧‧ wire loop

20L _n+1 ‧‧‧ wire loop

22a, 22b, 22c‧‧‧ coil

23a, 23b, 23c‧‧‧ needle thread

24a _n , 24b _n , 24c _n ‧ ‧ needle coil

24a _n-1 , 24a _n+1 ‧‧ needle

24c _n+1 ‧‧ needle coil

Claims (2)

A pseudo-double-strand stitch structure, which is formed by penetrating a cloth and having a needle thread at one end, a plurality of parallel needles including a needle thread at the other end, and a column on the back of the fabric and the plurality of columns The needle thread is combined with a trim line having a lower trim line loop formed by the nth position, the lower trim line loop being attached to the bright needle thread from the one end row to the other end row of the needle thread After the state of the loop in the needle coil formed by the nth order of the column is passed, it is wound only on the stitch of the n+1th position formed by the other end row. A multi-needle sewing machine is a sewing machine which is formed into a pseudo-double-strand stitch structure according to claim 1 of the patent application, which is composed of the following members, that is, a plurality of needles, which carry needle threads and are fed The orthogonal directions are juxtaposed, and move up and down in conjunction with the main shaft; the curved needle carries the lower trim line, and only reciprocates in the direction of the needle arrangement in synchronization with the upper and lower movements of the needle, and when going to the action Hooking the needle coil formed by the needle that rises from the bottom dead center, and detaching from the needle coil during the returning motion; and the hook piece, which reciprocates in conjunction with the main shaft, and passes through when going to the action The lower thread of the front end portion of the looper which protrudes from the needle coil of each needle is engaged, and the next open line is formed in the front side of the feed direction of the looper, thereby forming only the other one of the plurality of needles which are lowered A wire loop that the needle at one end will enter.