JPH06105976A - Buttonhole processing method for cloth conveyer of buttonhole sewing machine - Google Patents

Abstract

(57) [Summary] [Purpose] A button in a cloth transporting device that has a pair of cloth gripping mechanisms in the front-back direction in the cloth transport direction and moves the cloth to the next button-holing position after the button-holing operation by the sewing machine is completed. Corrects the bending and swelling of the cloth caused by the reciprocating motion of the cloth holder of the sewing machine at the time of drilling to realize accurate cloth conveyance. [Structure] The clamp of one cloth gripping mechanism is operated to start the cloth conveyance to pull the cloth to eliminate the flexure and bulge on the cloth, and then the clamp of the other cloth gripping mechanism is operated to make the cloth smooth. This is a buttonhole processing method that enables accurate transportation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buttonhole machining method, and more particularly, it has a pair of first and second cloth gripping mechanisms in the front-rear direction in the cloth conveying direction. The present invention relates to buttonhole processing in a cloth transporting device that moves cloth to the next buttonhole overlocking position.

[0002]

2. Description of the Related Art Conventional buttonhole processing will be described with reference to the drawings. FIG. 1 is a perspective view showing a buttonhole sewing machine equipped with a cloth conveying device, a so-called indexer. In the figure, 1 is a sewing machine head, 2 is a needle drop point, 3 and 4 are first and second cloth gripping mechanisms, which are provided with needle drop points 2 in between in the cloth conveying directions shown by arrows A and B, respectively. Has been. First
The second cloth gripping mechanisms 3 and 4 constitute a cloth conveying device with a stepping motor (not shown) provided on the lower surface of the table, which is a drive source, a rack and pinion which is a transmission mechanism, and a drive source control means. is doing. The first and second cloth gripping mechanisms 3 and 4 slide the cloth while pressing it against the table, and move in synchronization with the directions of arrows A and B, so that the button hole position becomes the needle drop point 2. Transport cloth to position.

The first and second cloth gripping mechanisms having the same structure have first rotating bodies 31 and 41 and second rotating bodies 32 and 42, respectively, and these rotating bodies are drive sources. It is rotated by the air cylinders 33 and 43, and when the pressure of the air cylinders is released, it returns to the original position by the biasing force of the springs 5 and 5. Clamps 31a and 41a are provided on the first rotating bodies 31 and 41, respectively, so that the first rotating bodies 31 and 41 are moved up and down according to the rotation of the rotating bodies to press and release the cloth on the table.

On the other hand, a pair of clamps 32a, 32b and 42a, 42b are also provided on the second rotating bodies 32, 42 which are rotated by being driven by the respective first rotating bodies. At the same time, it moves up and down to press and release the cloth on the table.

In order to form a button hole in a predetermined cloth, first, the cloth is set on the table so that the button hole position in the cloth is at the needle drop point in the raised state of each clamp. When the sewing machine is switched on, the cloth presser of the sewing machine is lowered and the overholstering is performed. When the sewing at one place is completed, the rotary body is driven by the air cylinder to rotate as the cloth presser of the sewing machine rises, and the clamps descend to press the cloth on the table.

Then, the cloth gripping mechanisms 3 and 4 move synchronously in the direction of either arrow, that is, in the right or left direction in the figure while pressing the cloth, and the next button hole position in the cloth is the needle drop point 2. Slide the cloth over the table a certain distance so that it sits on top. In this way, when the cloth is set to the next button hole formation preparation position, the cloth presser of the sewing machine is lowered to fix the cloth.

When the cloth retainer is lowered to fix the cloth at a predetermined position, the pressure applied to the cloth by each clamp is released. That is, when the reciprocating rods of the air cylinders 33 and 43 retreat to release the pressing force to each rotating body, the rotating bodies are returned to their original positions by the urging forces of the springs 5 and 5 so that each clamp is separated from the table. . At the same time, the buttonhole forming operation by the sewing machine is started. Then, the above operation is sequentially repeated by the number of button holes set and input to the control means.

[0008]

However, the above-mentioned conventional technique has the following problems. This will be described with reference to FIG. The buttonhole is formed while the cloth presser of the sewing machine reciprocates the cloth. To explain this in detail, first, as shown in FIG. 2A, the cloth presser 6 presses the cloth at the same time when the sewing operation is started. While moving the cloth 7 in the direction of the arrow C, the buttonhole is sewn on one side of the buttonhole during this time.
Then, as shown in FIG. 2B, the cloth presser 6 is moved back to move the cloth 7
The other side is sewn while moving to the original position, and a slit by a knife is formed between both the sewn stitches to form a button hole and sew a stitch. However, when the cloth presser 6 moves back, as shown in FIG. 2B, the cloth bends and bulges 8 in the traveling direction of the presser 6.
Are often formed.

If each of the clamps descends and conveys the cloth while such a bulge is formed, there is a problem that the planned button hole position cannot be accurately conveyed and set to the needle drop point 2. Will occur. Such a cloth bending phenomenon often occurs when there is a large amount of cloth remaining in the backward direction of the cloth presser or when the cloth is thin.
However, such bending or bulging of the cloth does not cause a problem when the cloth is conveyed by the cloth conveying device in the arrow D direction as shown in FIG. 2B and the button holes are sequentially formed. . That is, the side where the buttonhole is to be formed (the left side in the figure) is smooth without any bending or bulging.

Therefore, in reality, this often causes a problem when the buttonholes are formed in a column in a woman's blouse or the like. The button hole is usually formed from the collar side for the sake of appearance accuracy, but since the woman is right front alignment, the first button position on the collar side in FIG. 2B, the button holes are sequentially formed, and this will be described with reference to FIG. 2B. The cloth 7 is sequentially conveyed to the left and the button holes are formed. Therefore, the flexure or bulge 8 is included in the area where the buttonhole is formed, and it becomes difficult to form the buttonhole at an accurate position as described above.

[0011]

SUMMARY OF THE INVENTION The present invention comprises a pair of first and second cloth gripping mechanisms in the front-rear direction in the cloth conveying direction, and after the sewing operation of the buttonhole is completed, the cloth is moved to the next buttonhole. For the button hole processing in the cloth transporting device which moves to the overlock position, after finishing the predetermined buttonhole operation, operate the first cloth gripping mechanism in the front in the cloth transport direction around the needle drop point and raise the cloth retainer of the sewing machine. Then, the conveyance of the cloth is started by the first cloth gripping mechanism, and the second cloth gripping mechanism at the rear in the cloth conveying direction is operated with the needle drop point as the center, with a slight delay after the cloth starts to be conveyed. The first and second cloth gripping mechanisms move the cloth to the next button hole processing position, and after the cloth moves to a predetermined button hole processing position, the cloth presser of the sewing machine is lowered and And by configuring the gripping action of the second fabric gripping mechanism so as to form a buttonhole stitching operation by a sewing machine to release, we are intended to solve the conventional problems described above.

[0012]

In the present invention, the first cloth gripping mechanism at the front side in the cloth conveying direction first operates to start the conveyance while pressing the cloth, and the deflection and bulge formed on the cloth are eliminated by this conveyance. After a necessary and sufficient time has elapsed, the second cloth gripping mechanism at the rear side in the cloth transporting direction operates on the cloth to carry the cloth by a predetermined amount together with the first cloth gripping mechanism.

Therefore, the button hole can be formed at an accurate position without bending or bulging on the cloth between the first and second cloth gripping mechanisms.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the present invention is shown in FIGS.
Follow the instructions below. A buttonhole sewing machine,
Since the structure of the cloth conveying device is the same as the conventional one, the duplicated description will be omitted. First, the cloth conveying operation according to this embodiment will be described with reference to the flowchart shown in FIG. At the start of sewing, specifications of sewing, that is, the cloth conveying direction, button hole intervals, the number of button holes, etc. are input to the control means by the control panel of the sewing machine. Set the cloth so that the first button position on the collar side is located at the needle drop point, and turn on the switch.

The cloth presser 6 is lowered and the buttonhole forming operation by the sewing machine is started (see FIG. 2). When the button hole forming operation is completed, if the cloth conveying direction is the same as the forward direction of the cloth presser of the sewing machine (the arrow C direction in FIG. 2),
Each clamp 32a, 32b, 31a of the first cloth gripping mechanism 3
Lowers and holds the cloth on the table (see FIGS. 1 and 3).

Then, when the cloth presser 6 of the sewing machine rises, the first cloth gripping mechanism keeps its clamps lowered, and the second cloth gripping mechanism 4 keeps its clamps raised in the cloth conveying direction (Fig. Start moving to the left with 1). After a lapse of a predetermined time from the start of this movement, each clamp of the second cloth gripping mechanism 4 moving together with the first cloth gripping mechanism 3 descends and grips the cloth, and a predetermined amount of the first cloth gripping mechanism 3, that is, The cloth is conveyed so that the distance between the button holes is set and the next button hole position on the cloth comes to the needle drop point.

As described above, since the clamps of the first and second cloth gripping mechanisms are descended by a time difference,
Deflection, bulge, etc., which have occurred in the cloth when the cloth presser 6 of the sewing machine is returned, are completely eliminated. That is, as shown in FIG. 3, the flexures and bulges 8 generated by the reciprocating movement of the cloth presser 6 of the sewing machine in FIG.
b and 31a are first lowered to be eliminated by conveying the cloth 7 in the arrow direction. In this way, after the flexure and bulge 8 are eliminated, the clamps 42a, 42 of the second cloth gripping mechanism are removed.
Since b and 41a descend to convey the cloth, accurate cloth conveyance is possible.

The time difference from the start of the conveyance of the cloth 7 by the first cloth gripping mechanism 3 to the lowering of each clamp of the second cloth gripping mechanism depends on the cloth conveying speed and the like, but in this embodiment, it is 12 mm. /0.9 sec. The time difference is 0.09 seconds at the conveyance speed of.

When the cloth is conveyed and the next button hole position is set at the needle drop point, the movements of the first and second cloth gripping mechanisms are stopped and the cloth presser of the sewing machine is lowered, while both cloth gripping mechanisms are moved. Each clamp rises. After that, a buttonhole forming operation is performed by the sewing machine, and the above steps are sequentially repeated depending on the number of buttonholes.

[0020]

According to the present invention, in buttonhole machining in a buttonhole sewing machine having a pair of cloth gripping mechanisms in the front and rear of the cloth conveying direction, the clamp of one cloth gripping mechanism is operated to start cloth conveyance, After a lapse of a predetermined time, the clamp of the other cloth gripping mechanism is operated, so that the flexure and bulge generated on the cloth due to the reciprocating motion of the cloth holder of the sewing machine are corrected, and accurate cloth conveyance becomes possible. The quality of buttonhole sewing can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of a buttonhole sewing machine equipped with a cloth conveying device.

FIG. 2 is an explanatory diagram showing a state in which bending and swelling occur due to a cloth pressing operation of the sewing machine.

FIG. 3 is an explanatory view showing a state in which the flexure and the bulge of the cloth are eliminated in one embodiment of the present invention.

FIG. 4 is a flowchart showing an embodiment of the present invention.

[Explanation of symbols]

 1 sewing machine head 2 needle drop point 3 first cloth gripping mechanism 31, 41 first rotating body 32, 42 second rotating body 31a, 32a, 32b clamp 41a, 42a, 42b clamp 33, 43 air cylinder 5 biasing spring 4th 2 cloth gripping mechanism

Claims (1)

[Claims] 1. A cloth conveying device comprising a pair of first and second cloth gripping mechanisms in a front-rear direction in a cloth conveying direction, and for moving the cloth to a next button-hole sewing position after the button-hole sewing operation by the sewing machine is completed. In the buttonhole processing in
(A) A step of operating the first cloth gripping mechanism in the front in the cloth transport direction around the needle drop point and raising the cloth presser of the sewing machine after finishing the predetermined buttonhole
(B) Next, the conveyance of the cloth is started by the first cloth gripping mechanism, and the second cloth gripping mechanism at the rear in the cloth conveying direction is operated with the needle drop point as the center, with a slight delay after the start of the conveyance of the cloth. A step of moving the cloth to the next button hole processing position by the first and second cloth gripping mechanisms, (c) after the cloth has moved to a predetermined button hole processing position, the cloth presser of the sewing machine is lowered and A step of releasing the gripping operation of the first and second cloth gripping mechanisms to perform a buttonhole overlocking operation by the sewing machine, (d) a step of sequentially repeating the above steps according to the number of buttonholes, and the above steps. A method for processing buttonholes in a cloth conveying device of a buttonhole sewing machine.