JPS62620Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a cloth holding device in an automatic sewing machine.

Prior Art A conventional automatic sewing machine (commonly known as an indexer) such as a continuous automatic button attaching and buttonholing device is as shown in FIG. It is something.

This device is a cycle sewing machine A equipped with a button sewing needle 2 installed in the middle of one side of the upper surface of a workbench 1.
, a button supply device B that sorts and sends out the buttons so that the front and back sides are in a predetermined direction, a button delivery device C that transports the selected buttons to the button holder of the cycle sewing machine A, and a sewing machine of the sewing machine A. A sewing detection device (not shown) that checks whether the button has been sewn onto the cloth W after the cycle is completed, and a cloth transfer mechanism (a second cloth transfer mechanism) that transports the cloth W so that the next button sewing place matches the needle 2. (Fig. 2), a carry-out device D that carries out the fabric W on which the planned number of buttons have been sewn from the sewing machine sewing section, and a stacker E that neatly stacks the carried-out fabric W in a place away from the workbench 1. The main components are:

Among these devices, the cloth transfer mechanism is as shown in FIG. That is, below the workbench 1 shown in FIG. 1, a pair of sprockets 4, 4 on which the timing belt 3 is stretched is disposed between the right end and the center of the workbench 1, and the sprocket 4 in the center A stepping motor (hereinafter referred to as "motor") 5 is provided for interlocking the motors. Guide shafts 6, 7, and 8 are disposed parallel to the transport direction of the cloth W over almost the entire length of the workbench 1, and the guide shaft 6 has a first carriage 9 and a second carriage fixed to the timing belt 3. 10 are slidably inserted. Note that the connecting rod 11 fixed to the first carriage 9 is connected to the second carriage 10 by a set screw 12.
Both carriages 9,1
0 separation distance can be adjusted to desired dimensions. These carriages 9, 10 are supported by guide shafts 7, 8 and have support arms 13, 14 of a desired shape that are movable in the axial direction.
The free ends of the arms 13 and 14 both extend in a curved manner toward the surface from the side (top in FIG. Air cylinder equipped with presser feet 15 and 16 facing downward (hereinafter referred to as "presser foot CYL")
17 and 18 are installed. In addition, cloth support 19
is facing the presser foot 15, and its upper surface is placed on the workbench 1.
is fixed to the support arm 13 so that it is flush with the surface of the
The cloth W placed on the workbench 1 is held between 5 and 19, and the cloth W is
It is designed to release. On the other hand, on the right side of the sewing machine A on the workbench 1 facing the presser foot 16, there is a hollow body with a plurality of holes 20a bored in its upper surface and whose base is connected to a suction pump (not shown) that is constantly operated. 20 is installed so that its upper surface is flush with the surface of the workbench 1, and the cloth W set at the sewing position of the workbench 1 is sucked and brought into close contact with the upper surface of the hollow body 20, and by the action of the presser foot CYL18, A presser foot 16 is provided to press the cloth W against the upper surface of the hollow body 20 to prevent the cloth from shifting.

With the configuration described above, the fabric W placed at a predetermined position on the workbench 1 is moved by the lowered presser feet 15 and 1 according to instructions from a microcomputer (not shown).
6 onto the upper surfaces of the cloth support 19 and the hollow body 20, respectively. When the sewing machine A finishes sewing a predetermined number of button stitches, the motor 5 rotates to advance both integrally connected carriages 9 and 10 by a predetermined distance in the transport direction a, and then stops.
Therefore, the fabric W held between the fabric presser foot 15 and the fabric support 19 provided on the support arm 13 of the first carriage 9
is moved a predetermined distance while being pressed against the hollow body 20 by the presser foot 16 provided on the support arm 14 of the second carriage 10, and the next button is sewn. When all the planned number of buttons are sewn by repeating the above operations, the cloth W is transferred to the carry-out device D, and then the presser feet 15 and 16 are raised and released. Thereupon, the motor 5 is rotated in reverse, and the cloth transfer mechanism returns to its original state, ready for the next operation.

However, in the above-mentioned conventional automatic sewing machine, the suction device performs suction operation continuously, so when a long piece of cloth W, such as the body of a dress shirt, is set, as shown by the two-dot chain line in Fig. The middle part of the cloth W was bent, and its correction required a great deal of time. Improperly setting the fabric before sewing will cause the spacing and position of buttons and buttonholes to be off, and unnatural wrinkles will appear when the finished shirt is worn on the body. This can cause fatal defects in sewn products.

Purpose of the invention This invention was made by paying attention to the above-mentioned problem, and by preventing the cloth from being attracted to the upper surface of the hollow body using a suction device when setting the cloth,
It is an object of the present invention to solve the above-mentioned drawbacks of the conventional cloth by making it possible to quickly and accurately set cloth.

Embodiment of the invention Hereinafter, an embodiment of the invention will be described based on FIG. 3 and subsequent figures. The state in which the changing device F of the present invention is applied is shown in FIGS. 1 and 2 by two-dot chain lines, and the same parts as in the conventional example are denoted by the same reference numerals, and the explanation thereof will be omitted.

The hollow body 20 has an air discharge hole 21 formed on the lower right side thereof, and the other end of a hose 22 whose one end communicates with a suction pump is connected to the discharge hole 21. Further, an air cylinder 23 is fixed downwardly on the upper surface of the hollow body 20 corresponding to the discharge hole 21 so that its operating rod 24 can move up and down inside the hollow body 20, and the lower end of the operating rod 24 is fixed so that the air cylinder 23 can move up and down. The shielding plate 25 is fixed so as to open and close the discharge hole 21.

A start switch 26 placed in a suitable position is turned on while being pressed and turned off when released, and turns on and off a valve (not shown) by turning it on and off.
It is electrically linked to both when turned off and so that once turned on and then turned off, the entire device sequence begins. Also, when the valve is turned on, the air cylinder 23 is urged so that the actuating rod 24 is pressed downward, and when the valve is turned off, the actuating rod 24 is pressed downward.
The air cylinder 23 is deenergized so that the air cylinder 4 is returned upward.

This invention has the above structure, and its operation will be explained next. When the power is turned on, the suction pump is activated, whereby outside air is suctioned through the small hole 20a of the hollow body 20, and a so-called suction device is activated. When the start switch 26 is turned on from this state, the changing device F is activated and the suction device is put into an inactive state. That is, the air cylinder 23
The actuating rod 24 is pressed downward, so that the discharge hole 21 is shielded by the shielding plate 25, and the suction action by the hollow body 20 is stopped. Therefore, in this state, the cloth W can be easily placed at a predetermined position on the upper surface of the workbench 1 without being disturbed by the suction force of the suction device. Next, when the start switch 26 is turned off from this state, the air cylinder 23 is deenergized via the valve, and the operating rod 2
4 moves upward, so the shielding plate 25 closes to the discharge hole 21.
is opened, and the hollow body 20 as a suction device resumes its suction action and attracts the cloth W to its upper surface. Furthermore, when the start switch 26 is turned off, the above-mentioned action is restarted and the sewing machine sequence is started in parallel.
A preset number of sewing cycles and movement of the fabric a preset distance are alternately repeated. Note that the suction device continues the suction state until the start switch 26 is turned off again.

As described above, this invention allows sewing multiple separated locations by repeating the sewing cycle of the cycle sewing machine and the movement of the fabric support device alternately a predetermined number of times while the suction device is in the suction state with a single operation of the start switch. The automatic sewing machine is equipped with a change device that can change the suction device between a suction state and a non-suction state,
Since the suction device can be set in a non-suction state when setting the cloth on the workbench, the cloth can be set quickly and accurately, and the sewing quality can be improved.

In addition, while the start switch is operated in one direction, the change device is used to put the suction device into the non-suction state, and by returning the start switch, the suction device is put into the suction state and the cycle sewing machine is started. If a change device is associated with the start switch of the engine, operability can be improved.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an automatic sewing machine according to the present invention, FIG. 2 is a perspective view of a cloth holding device, FIG. 3 is a perspective view of essential parts of the present invention, and FIG. 4 is a time chart. A... Cycle sewing machine, F... Changing device, 1
5, 16...Fabric presser foot (fabric support device), 20...Hollow body (suction device), 26...Start switch.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A manually operable start switch, a cycle sewing machine that starts in response to the operation of the start switch and stops after forming a predetermined number of stitches, and a sewing machine that passes through the stitched portion of the cycle sewing machine. Two sets of fabric support devices are provided, which are movable along a straight line and are spaced apart in the front and back of the movement direction to support both ends of the fabric on the suturing plane, and the upper surface having a plurality of small holes passing through the fabric is at the same height as the suturing plane. a suction device consisting of a hollow body arranged along the movement path of the rear cloth support device so as to be substantially coincident with each other, and a pump connected to the hollow body and operated to suck air from the small holes of the hollow body; In an automatic sewing machine, the sewing cycle of the cycle sewing machine and the movement of the fabric support device are alternately repeated a predetermined number of times while the suction device is in the suction state in a single operation to sew multiple separated locations. A cloth holding device for an automatic sewing machine, characterized in that it is equipped with a changing device that can change between a state and a non-suction state. 2. Registered request for changing the suction device to the non-suction state while the start switch is being operated in one direction, and placing the suction device in the suction state and starting the cycle sewing machine in connection with the return of the start switch. A cloth holding device for an automatic sewing machine according to scope 1.