JPS63186688A - Sewing method of flat stitch sewing 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 [Field of Industrial Application] The present invention relates to a sewing method using an interlock stitch sewing machine that forms decorative seams on both the front and back sides of a fabric.

(Prior Art) In the sewing method of the interlock stitch sewing machine as described above, a suture line is formed by a plurality of needles that move up and down through the needle sections on both sides of the throat plate pawl that protrudes in the cloth feeding direction. At the same time, by passing the upper decorative thread between each of the suture lines on the surface of the fabric, and by interposing the lower decorative thread between each of the suture lines on the back surface of the fabric, with the throat plate claw interposed between the suture lines,
It is used to stitch interlock stitches on cloth. By the way, in this sewing method using an interlock stitch sewing machine, when the sewing direction of the stitches changes, it is necessary to stop the sewing machine and change the direction of the fabric, but as mentioned above, on the back side of the fabric, , the needle plate claw is interposed between the fabric and the bottom thread.For this reason, in the past, when changing the direction of the fabric as described above, the end of the seam of the fabric was first sewn with a sewing machine. The fabric is removed from the throat plate pawl by eight shifts in the fabric feeding direction, and then the stitch end is positioned at the needle drop again to perform sewing in a direction different from that before the direction change.

(Problem to be solved by the invention) However, as mentioned above, when the fabric is moved in the fabric feeding direction of the sewing machine, the thread is pulled out from the needle, looper, etc. at the same time as this movement, so the end of the stitch is again removed from the needle drop. When the needle is placed in the needle drop section, a loose thread will occur between the needle or looper and the needle drop section. For this reason, in conventional methods, when the direction of seam movement changes, the aforementioned loose threads harden at the direction change section or protrude from the seam, resulting in poor appearance and reduced product value. There was a problem with putting it away. Further, the work itself of pulling the fabric out of the throat plate claw and putting it back in was extremely troublesome.

The present invention has been made in view of the above-mentioned circumstances, and provides a sewing method for an interlock stitch sewing machine that can beautifully sew a seam at a direction change part even when the direction of seam movement changes. The purpose is to

(Means for Solving the Problems) In order to achieve the above object, the method for manufacturing the interlock stitch sewing machine according to the present invention temporarily stops the sewing operation of the sewing machine when the direction of stitch progress changes, and Retracting the throat plate claw protruding from the fabric in the opposite direction to the cloth feeding direction and pulling it out from between the fabric and the base thread, changing the orientation of the fabric, and then returning the throat plate claw to its original position; This is characterized in that the sewing operation is then started again.

[For production]

With the sewing method of the interlock stitch sewing machine according to the present invention, as described above, the direction of the fabric can be changed without changing the position of the end of the stitch almost eight times, and the thread is not pulled out.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a throat plate pawl, which is provided facing the cloth feeding direction of the sewing machine (in the direction of the arrow in the figure), and whose rear end 1a is attached to the throat plate pawl 1. The pawl 1 is connected to a drive groove 2 for retracting the pawl 1 in a direction opposite to the cloth feeding direction. 3 is a bed of this sewing machine, and a throat plate 4 is fixed to the upper surface of this bed 3. The throat plate pawl 1 is fitted into a guide groove 4b on the back side of the throat plate 4 so that its tip 1b normally projects into a needle drop hole 4a formed in the throat plate 4. In the needle drop hole 4a, the upper surface of the throat plate pawl l is located slightly below the upper surface of the throat plate 4, as shown in FIG. 2A. Further, the throat plate claw 1 is
When the tip portion 1b is inserted into the needle drop hole 4a, the needle drop portions Nl and N2 provided in the needle drop hole 4a are inserted into the third needle drop hole 4a.
As shown in Fig. A, they are provided so as to be located on both sides of the rear side of the tip portion 1b.

The drive mechanism 2 fixes the middle part of the drive lever 7 to the rotating shaft 6 of the rotary solenoid 5, and connects the rear end of the throat plate pawl l to a cylindrical pin 7a provided on the upper side of the drive lever 7. A notch 1aa formed in the portion 1a is fitted and connected. Further, a coil spring 8 is wound around the rotation shaft 6, and the coil spring 8 causes the drive lever 7 to move in a direction that substantially coincides with the cloth feeding direction A of the sewing machine, that is, in FIG. 2A. It is biased in the counterclockwise direction C. Therefore, at all times, the throat plate pawl l connected to the drive lever 7 is biased toward the cloth feeding direction A, and its tip 1a protrudes into the needle drop hole 4a. 9a is a stopper made of a bolt, and this stopper 98
is in contact with the drive lever 7 which is biased by the coil spring 8 above the fixed part of the rotating shaft 6, and is rotated to advance and retreat, thereby controlling the amount by which the throat plate pawl 1 enters the needle drop hole 4a. It regulates the On the other hand, the rotary solenoid 5 is driven to move the upper part of the drive lever 7 in a direction that resists the biasing force of the coil spring 8 (clockwise direction D shown in FIG. 2A).
As shown in FIG. 2B, the throat plate claw 1 retreats in the direction opposite to the cloth feeding direction (in the direction of arrow B in the figure), and the tip 1b of the throat plate claw 1 reaches the needle drop Nl. , and will be located behind N2. Reference numeral 9b denotes a stopper for regulating this backward movement, which contacts the drive lever 7 below the fixed part of the rotary shaft 6, and is made of a bolt like the stopper 98, and is rotated to move forward and backward to close the throat plate. Adjust the amount of retraction of claw 1. Reference numeral 10 denotes a fixing lever, which is fixed to the tip of a screw 11, and by rotating the screw 11, the tip 1b is inserted into the needle hole 4a. Engages with a certain throat plate pawl l,
This prevents the throat plate pawl l from moving even if the rotary solenoid 5 is driven. In addition, 12 is a fitting for attaching the rotary solenoid 5, etc., and bolts 13
It is fixed to bed 3 by.

By driving the sewing machine, the two needles 22 and 23 fixed to the needle stock 21 are moved to the aforementioned needle drop portion Nl.
, N2, penetrates through the back side of the throat plate 4, and engages the upper thread that it feeds in time with the cloth feeding with the lower thread that is supplied on the back side of the throat plate 4 (not shown), thereby creating two rows of suture lines. form.

The spreader 24 operates transversely to the fabric feed direction so as to spread the upper comb thread between the upper threads supplied by the two needles 22, 23 mentioned above. 25.
Reference numeral 26 denotes a guide body that guides the top thread with respect to the spreader 24.

Although not shown, on the back side of the throat plate 4, a louver mechanism also creates a line between the two rows of suture lines formed by the upper thread inserted by the needles 22 and 23 and the lower thread engaged with this upper thread. The bottom thread is hung over it.

Reference numeral 27 denotes a presser bar, and although not shown for convenience, a known presser plate is attached to the tip of the bar.

Next, a sewing method using the interlock stitch sewing machine configured as described above will be explained.

When the rotary solenoid 5 is not operated, the throat plate pawl l is biased by the coil spring 8, and its tip 1
b is inserted into the needle drop hole 4a as shown in FIGS. 1 and 2A. Sewing with the sewing machine is thus performed with the tip 1b of the needle drop claw 1 inserted into the needle drop hole 4a.

Therefore, at the needle entry point Nl+N2 of the needle 22°23, as shown in FIG. 2A, the fabric X to be sewn and the tip 1b of the throat plate claw 1 overlap, and therefore the bottom thread F2 is
The stitch plate claw 1 is interposed between two suture lines formed on the fabric X corresponding to the needle drop portions N1 and N2 of the needles 22 and 23, and the stitches are hung across the fabric. In this way, by sewing with the needle plate claw 1 interposed, when the needle plate claw 1 comes off from the sewing part as the cloth is fed, the upper decorative thread Fl and the lower decorative thread F2 can be appropriately spanned.

Next, as shown in Fig. 2A, the sewing machine is stopped after the needle has come out of the fabric while the sewing is in progress, and the rotary solenoid 5 is activated to move the needle plate pawl 1 into the fabric as shown in Fig. 2B. When retracted in the direction opposite to the feeding direction (in the direction of arrow B in the figure), the upper comb thread F1 and the lower decorative thread F2 are sewn onto the fabric X up to the stitch end E.

By operating the throat plate pawl 1 as described above, the third
A sewing method as shown in FIGS. A to 3E is carried out when the direction of progress of the interlock stitch changes.

That is, as shown in FIG. 3A, the top stitching thread F1 and the bottom stitching thread (not shown) are stretched between the suture lines G+ and 02, and the first sewn portion is straight or gently curved. A second sewn portion S2, in which the direction of stitch progression changes in a polygonal line, continues from the terminal end E of the first sewn portion S.
(See Figure 3E), first the first sewing part S
As shown in FIG. 2A, the needle plate claw 1 is formed with the tip 1b of the needle plate claw 1 inserted into the needle drop hole 4a.

Next, when the first sewing part S reaches the terminal end E, the needle comes out of the fabric, the sewing machine is stopped, and the throat plate claw l is moved in the fabric feeding direction as shown in FIG. 3B. and retreat in the opposite direction B. In this way, when the throat plate pawl l is retreated in the opposite direction, both the upper decorative thread F and the lower decorative thread F2 are sewn onto the fabric X until the end @E, as shown in FIG. 2B. be done. The timing for retracting the throat plate pawl l in the opposite direction B can be determined, for example, by interlocking the drive of the throat rotary solenoid 5 when the presser plate (not shown) attached to the tip of the presser bar 27 is raised. You can also
Alternatively, the number of stitches in the sewing section before the terminal end E, such as the first sewing section S1, may be counted, and when the number of stitches reaches a predetermined value, the rotary solenoid 5 may be driven. It is sufficient if the throat plate claw l is moved back in the opposite direction B at the same time as or after the driving of the sewing machine is stopped when the first sewing part S has been sewn to the terminal end E.

Next, as shown in Figure 3C, change the direction of the fabric
The stitch progressing direction of the second sewing section S2 shown in Fig. E is aligned with the cloth feeding direction. At this time, since the tip 1b of the throat plate pawl 1 is retracted to the rear of the needle drop portions N, , N, the fabric
can change its direction by rotating it around the terminal end E, and when changing its direction in this way,
The thread will not be pulled out from the needles 22, 23, spreader 24, etc. In addition, when the cloth X is rotated about the terminal end E, the rotation center at the terminal end E can be given to the cloth by a positioning means that advances and retreats in relation to the movement of the throat plate claw 1. This positioning means is constituted by, for example, a cloth pressing member attached to the tip of a rod of an air cylinder fixed to the sewing machine.

Next, the drive of the rotary solenoid 5 is released, and the urging force of the coil spring 8 causes the throat plate pawl l to move so that its tip 1b reaches the needle drop portion N, as shown in FIG. 3D.

Return to the original position set forward from +N2. Then, by driving the sewing machine again in this state and performing the sewing operation, the stitch line G3. G, a top thread F, and a bottom thread (not shown) are stretched between them to form a second sewn portion S2. At this time, it goes without saying that the craftsman thread is stretched between the needle drop portions N, , N2 with the throat plate pawl 1 interposed therebetween.

In the above embodiment, a method for operating some of the throat plate claws has been explained, but it is also possible to arrange multiple throat plate claws as described above in parallel and perform multiple rows of sewing corresponding to each throat plate claw. The present invention can be applied not only to two-needle sewing machines but also to multi-needle sewing machines having three or more needles.

(Effects of the Invention) As is clear from the above description, according to the sewing method of the interlock stitch sewing machine according to the present invention, the direction of the fabric can be changed without almost moving the position of the seam end, and the direction of the fabric can be changed. Since the thread does not pull out when changing the direction, when sewing parts with different stitch progressing directions are formed consecutively at the end of the stitch, there is no possibility of thread clumps or stitches at the changing part of the stitch progressing direction. The value of the product can be improved because no threads stick out.Furthermore, it is no longer necessary to separate the fabric from the throat plate pawl every time the direction of stitch progress is changed, which improves work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of the main parts of an interlock stitch sewing machine that implements the method of the present invention, Figs. 2A and 2B are explanatory diagrams showing the operating state of the throat plate pawl, and Figs. 3A to 3E. 2 is an explanatory diagram showing the procedure of the method of the present invention using the interlock stitch sewing machine shown in FIG. 1. FIG. l... Throat plate claw 22.23... Needle Nl, N2... Needle drop G, ~ G4... Suture line F,, F,... Upper thread F,... Lower Patent applicant: Pegasus Sewing Machine Manufacturing Co., Ltd.
Dai Patent Attorney Takashi Suzue - Figure 3A

Claims (1)

[Claims] (1) A suture line is formed by a plurality of needles that move up and down through the needle drops on both sides of the throat plate pawl provided toward the fabric feeding direction, and a top-dressing thread is formed between the suture lines on the fabric surface. In a sewing method for an interlock stitch sewing machine, which performs interlock stitching on a cloth by spanning the fabric, and interposing the needle plate claw between the sewing lines and the fabric on the back side of the fabric, and passing an undercover thread between each of the suture lines, When the stitch direction changes,
Once the sewing operation of the sewing machine is stopped, the needle plate claw is pulled back from between the fabric and the bottom thread by retracting it in the opposite direction to the fabric feeding direction.
A sewing method for an interlock stitch sewing machine, which comprises changing the orientation of the fabric, returning the throat plate pawl to its original position, and then starting the sewing operation again.