JPH0451989A - Sewing point changing method for chain stitch sewing machine - Google Patents

Abstract

PURPOSE:To enable a sewing point change in a short period of time by reaching the estimated part of starting sewing the next sewing point to a point under a crochet needle by moving cloth in the state of still connecting a thread to the sewing end part of the place after completing sewing at one point. CONSTITUTION:When sewing another sewing point B widely separated from the distance of moving one stitch from a sewing point A after sewing one sewing point A in cloth 7 and 8, first of all, a loop 10 in a sewing end part (a) at one sewing point A is made longer than a loop 10' in the case of moving one stitch by moving the cloth 7 and 8. Next, a space 11 is formed between a hook part 6 of a needle 5 and a tip part 10a of the loop 10 at the sewing end part (a) by returning the cloth 7 and 8. Then, the hook part 6 is backed from the tip part 10a of the loop 10 at the sewing end part (a) and afterwards, the cloth 7 and 8 is moved so that an estimated part (b) of starting sewing the next sewing point B can reach under the crochet needle 5. As the result, the point change is enabled in a short period of time.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to sewing in a chain stitch sewing machine in which after sewing one location is finished, the sewing location is changed to the next location away from the above location. Concerning the location change blade method.

[Conventional technology]

When you have finished sewing one place, cut the thread from the crochet hook,
Next, the end of the cut thread is tied to the fabric, and then the fabric is moved so that the area where the next sewing area is to be started is under the crochet needle, and sewing at that area is started. ing.

[l1al to be Solved by the Invention] This #all location changing method in the conventional chain stitch sewing machine has the problem that the sewing machine must be stopped during the work of tying up the cut thread. In order to solve this problem, an attempt was made to move the cloth after finishing the sewing at the above-mentioned two locations so that the area where the next sewing location is scheduled to start reaches below the crochet hook. But if you do that,
The thread that connects to the end of the sewing at the previous sewing location must be pulled out through the looper - the end of the sewing at the previous sewing location - the hook of the needle - the end of the sewing at the previous sewing location. This creates a problem in that the fabric is subject to a large tensile strength, which may cause it to break during the movement of the fabric, or even if it does not break, it may hang up, causing the pattern near the end of the previous sewing area to be distorted. For this reason, there is still a problem in that the work of cutting off the thread and tying the thread as described above is required.

The present invention was made to solve the above-mentioned problem (technical! III) of the prior art.After sewing at one location is finished, the thread remains connected to the end of the sewing at that location. A method for changing the sewing place in a chain stitch sewing machine that enables the sewing place to be changed in an extremely short time by moving the cloth with the button so that the part where the sewing is to start at the next sewing place comes under the crochet needle. is intended to provide.

[Means to solve problems]

In order to achieve the above object, the method of changing the sewing place in the chain stitch sewing machine of the present invention is such that after sewing one sewing place on the cloth, the sewing place is moved far away from the sewing place by a distance significantly larger than the dimension of moving one stitch. When sewing another sewing location, first, move the fabric to form a loop at the end of the sewing at the above-mentioned two sewing locations to be longer than the loop when moving one stitch, and then return the fabric. A gap is formed between the hook of the crochet hook and the tip of the loop at the end of sewing, and then the hook is retracted from the tip of the loop at the end of sewing, and then the next sewing is started. The cloth is moved so that the part where the sewing is to be started is located below the crochet hook.

[Effect]

When sewing at one location is finished, the thread is removed from the hook of the crochet hook and the fabric is moved so that the area where the next sewing location is to be started is brought under the crochet hook. Therefore, it is possible to start sewing at the next location in a very short time after finishing sewing at the above-mentioned one location. In the case of the cloth movement mentioned above, the thread is simply pulled out from the looper, so the tension applied to it is small.
The occurrence of string tension is prevented.

〔Example〕

The drawings showing the embodiments of the present application will be described below.

Reference numeral 1 denotes a well-known throat plate for chain stitch sewing machines, which has a needle hole 2. Reference numeral 3 indicates a well-known looper which is provided below the throat plate 1 and is rotatable in a horizontal plane. Reference numeral 4 indicates a threading hole in the looper 3. Reference numeral 5 indicates a crochet needle which is provided above the throat plate 1 and is capable of vertical movement through the needle hole 2, and 6 indicates a hook portion of the crochet needle 5. The crochet hook 5 is, for example, about the size of a Japanese crane, and its direction can be adjusted by rotation as shown by the arrow in FIG. 1A using a known crochet direction adjustment device.

Next, a description will be given of changing the sewing location when sewing the cloth 7.degree. 8 with the thread 9 using the chain stitch sewing machine. As shown in (A), the thread 9 is pulled out in a loop from the looper 3 using the crochet hook 5, and the cloths 7 and 8 are moved one stitch (for example, from 1.6 meters to 2 meters) in this state repeatedly. When the sewing at one sewing location A is finished, first, as shown in (B), the cloth 7.8 is moved in the same direction (or in a different direction) from the previous sewing direction. The loop 10 at the end part a is formed to be longer than the loop 10" in the case of the above-mentioned one-stitch movement (for example, 10-15 cranes). Next, as shown in (C), return the cloths 7 and 8, and return the above-mentioned loop. A gap 11 is formed between the tip 10a of the thread 10 and the hook 6. In this case, since the loop 10 is formed long, the elasticity of the thread 9 lifts the loop 10 upward as shown by the imaginary line. The above-mentioned gap 11 is reliably formed without causing the above-mentioned loop 10 to be lifted up.The length of the above-mentioned loop 10 is determined according to the stiffness of the thread 9 to prevent such lifting. Rotate the crochet hook 5 as shown in (D) to retract the hook 6 from the tip 10a of the loop 10.This retraction can also be done by raising the crochet hook 5 as shown by the imaginary line. Move the cloth 7.8 as shown in (E) and place the crochet needle 5 at the planned starting point of the next sewing location B, which is far away from the sewing location A by a distance significantly greater than the dimension of the one-stitch movement. Then start sewing normally on that part.

In the case of movement 7 and 8 on the same right, the hook 6 is facing in the opposite direction to the tip 1 (la) of the loop 10, so if the tip 1 is
Even if Oa touches the tip (lower end) of the crochet hook 5, there will be no accident of getting caught there. Also, thread 9 is attached to the previous sewing location A.
Since the thread 9 is located only between the sewing end part a and the threading hole 4 of the looper 3, the thread 9 is pulled out from the thread guiding hole 4 as the fabric moves, and the thread 9 becomes suspended. No accidents will occur.

After the sewing of the fabric 7.8 at the many sewing locations is completed as described above, the fabric 7.8 is removed from the sewing machine, the thread 9 between each sewing location is cut, and the ends of the cut threads are cut. The binding is done in a well-known manner.

When sewing is performed as described above, the fabrics 7 and 8 are stretched on a fabric frame, for example, and are moved horizontally by the frame drive device of the sewing machine, and in conjunction with this, the crochet needle 5 moves vertically and rotates in the direction. Adjustments are made. Control of these movements is automatically performed, for example, by a control device using a computer.

〔Effect of the invention〕

As described above, in the present invention, when sewing one place A is finished and the sewing place is changed to the next place B, the cloth is moved while the thread 9 is connected to the sewing end part a of the above place A. Since the planned sewing start point of the next location B is brought under the crochet needle 5, the location can be changed without cutting the thread 9, and there is no need to dispose of the cut thread as in the prior art. This has the effect of allowing you to start sewing the next part in a short time.

Moreover, in the above case, even though the thread 9 remains connected, in the present invention, the loop 10 at the sewing end part a of the previous sewing location A
Since the cloth 7.8 is removed from the hook 6 and the cloth 7.8 is moved, the thread 9 connected to the sewing end section a at the above location A is simply connected to the looper 3.
The tensilon added thereto is small, so the thread 9 will not be cut or pulled, and the effect is that the above-mentioned location change can be carried out in an extremely short time.

[Brief explanation of the drawing]

The drawings show examples of the present application, and are shown in Figures 1 (A) to (E).
) is a diagram showing the process of changing the sewing location in order. A, B... Sewing place, l... Throat plate, 3... Looper 5... Crochet hook, 6... Hook part, 7.8... Cloth, 9... Thread, 1o... ...Loop at the end of sewing. ward regret

Claims (1)

[Claims] A looper is provided below the throat plate, and a crochet hook that can move up and down is provided above the throat plate. By moving the crochet needle up and down, the crochet hook can pull out thread from the looper in a loop shape. In a chainstitch sewing machine that is designed to perform chain stitch sewing on the cloth on the throat plate by repeatedly moving the cloth one stitch in the above-mentioned condition, after sewing one sewing location on the cloth, When sewing another sewing location that is far away from the sewing location by a distance significantly greater than the dimension of the one-stitch movement described above, first, move the fabric to move the loop at the end of the sewing of the one sewing location mentioned above in the case of the one-stitch movement. Then, by returning the fabric, a gap is formed between the hook of the crochet hook and the tip of the loop at the end of the sewing, and then the hook is connected to the end of the sewing. A method for changing a sewing place in a chain stitch sewing machine, characterized in that the cloth is moved so that the expected sewing start part of the next sewing place comes under the crochet needle.