JPS6237564Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a presser foot device for an indexer in an automatic sewing machine.

[Conventional technology]

A typical indexer used in a conventional automatic sewing device is one for attaching buttons, including button holes. FIG. 2 shows an example of the front body of a shirt as the sewn product work W in this case. X ₁ , X ₂ , X ₃ ... are the first, second, third... buttons (positions), respectively, c is the distance between the front edge of the cloth of the workpiece W and the first button X ₁ , and a and b are the distances between each button Indicates the interval between

As a device for automatically attaching buttons to this type of workpiece (cloth), an automatic sewing device (commonly known as an indexer) is known, for example, as shown in Fig. 3, a perspective view of the main part. -Refer to No. 80976). This device includes a cycle sewing machine A for sewing buttons that is fixedly arranged in the middle on the horizontal plane of a workbench 1, a button supply device B that sorts out the front and back sides of buttons, and sends out only the buttons with the front and back facing in a predetermined direction. A button carrying device C that transports the button sent out from now on to the button holder 2 of the cycle sewing machine A, and a sewing detection device D that checks whether the button has been sewn onto the workpiece W after the sewing cycle of the sewing machine A is completed. , workpiece W so that the next button matches the sewing machine seam.
a cloth transport mechanism (not shown) for transporting the workpiece W, a transport device F for transporting the workpiece W with all the planned number of buttons sewn from the sewing machine sewing section, and a worktable for transporting the workpiece W to be transported from the sewing machine sewing section. It consists of a stacker (not shown) etc. for stacking at a location away from 1. In addition, 4 is a sewing machine needle, 33 and 34 are front and rear presser cylinders (clamps) 3, respectively.
The workpiece presser 33' attached downward to the piston rods 5 and 36 is an auxiliary workpiece branched from the piston rod of the cylinder 35 toward the front side in a direction perpendicular to the transport direction L of the workpiece W. , 37 is cloth support,
38 is a suction body having a plurality of holes 38a, 50 is an arm of the unloading device F, 53 is a belt, and 65 is a start switch (push button) for starting the operation sequence of the indexer.

When setting the work cloth W for attaching buttons to the indexer as described above, the first
There is a limit to the distance c to the button position X ₁ because the sewing machine bed A ₁ and the cloth support 37 contact and interfere because the cloth W is clamped to the cloth support 37 and transferred in the L direction. Yes (generally about 35mm). In order to further reduce this distance c, as shown in _FIG . , can be shortened.

[Problem that the invention attempts to solve]

However, if an attempt is made to further shorten the distance c using such a method, problems such as the presser foot cylinder 35 coming into contact with the sewing machine part will occur. Therefore, when trying to use _an indexer for attaching the entire button to a workpiece W with a small distance c such that an indexer cannot be used for attaching the _first button This had to be done manually in a separate process, which diminished the significance of automatic equipment and was extremely disadvantageous in terms of work efficiency.

This idea was made in view of the above problems, and even when the distance between the first button position and the workpiece is short as described above, the auxiliary presser foot engages with the workpiece, so that a completely separate workpiece can be created. The objective is to be able to consistently perform all button attaching processes from the first button in an "automatic operation" mode using this indexer, regardless of the process.

[Means for solving problems]

In this invention, the auxiliary presser foot shown in the conventional example is branched from the piston rod of the front presser cylinder to the front side and tilted backward (in the opposite direction to arrow L) from the direction perpendicular to the workpiece transfer direction. The operation sea case is programmed to return the presser foot to its original position after the first cloth (work) feeding process.

〔Example〕

This invention will be explained below based on examples.
FIGS. 1a and 1b show an embodiment of this invention in which the front presser foot presses the first and second buttons of the workpiece W, respectively.
This is a top view of essential parts showing a state in which X ₁ and X ₂ are attached, and the same (equivalent) components as in FIGS. 2 and 3 showing the prior art example described above are indicated by the same reference numerals.

As is clear from Fig. 1, the front presser foot cylinder 3
The auxiliary presser foot 33'a, which is provided by branching off from the piston rod No. 5 to the front side, is inclined rearward (in the opposite direction to the arrow L) from the direction perpendicular to the workpiece transfer direction L with respect to the front presser foot 33 directly below the cylinder. The cloth presser foot 33 is arranged at a position such that even when the cloth presser foot 33 does not reach the front end of the workpiece W, it can engage with a part of this front end and press the cloth as shown in FIG. 1a. be.

[Effect]

First, after reading the number of buttons/feed amount, etc., set the workpiece W and turn the start switch 6.
Turn on 5 (Figure 3). If the distance c in FIG.
Regular sewing work can be performed in "automatic operation" mode by pressing button _X1 .

Even if the above-mentioned distance c is small as shown in FIG. The program is constructed so that the operation sequence follows the flowchart in FIG. 5 so that the program can be executed.

That is, after pressing the front end of the cloth with the auxiliary presser foot 33'a and performing the process of attaching the first button, the workpiece W is pressed between the auxiliary presser foot 33'a and the rear presser foot 3.
4 (FIG. 3), the cloth moves forward by the read setting amount (first cloth feeding process). After this first cloth feeding process, the clamp cylinders 35, 36 are raised for the presser feet 33, 34 and the auxiliary presser foot 33'a, and the presser feet 33, 33'a, 34 are returned to their original positions, and returned to their original positions. Then, press the presser foot 33, 33'a, 3 again.
4 and press down the workpiece W. At this time,
The workpiece W is also held down by the presser foot 33 (Fig. 1b), so after the process of attaching the _second button Can perform forwarding processing.

Although the above description has been made using an indexer for attaching buttons as an example, this invention is not limited to attaching buttons, but can of course be applied to indexers under similar working conditions.

[Effect of idea]

As explained above, according to this idea,
Even if the distance to the front end of the workpiece is short, the auxiliary work clamp is placed at a position where it can engage a part of the front end, and the operation sequence program has been changed accordingly.For example, in the case of a button indexer, the workpiece Even when the distance from the front edge to the first button is small, it is possible to attach all buttons, including the first button, in "automatic operation" mode, and after attaching the second button, it can be clamped with a three-point presser foot. This has the effect of preventing wrinkles or shifting of the cloth and maintaining the accuracy of the position of each button from the lateral edge of the cloth.

[Brief explanation of the drawing]

Figures 1a and b are top views of two positional states to explain the action of the presser foot of this invention, Figure 2 is an example of a sewn product workpiece, and Figure 3 is an example of a conventional button attaching indexer. FIG. 4 is a perspective view of the main parts, FIG. 4 is a modified example of the cloth support, and FIG. 5 is a flowchart of the operation sequence of this invention. 2...Button holding part, 4...Sewing machine needle, 33,
34... Presser foot, 33'a... Auxiliary presser foot, 3
5, 36... Material presser cylinder (clamp), 37
...Cloth support, 65...Start switch, W...
Work cloth, X ₁ , X ₂ , X ₃ ...first, second, third...
Button position.

Claims (1)

[Scope of utility model registration request] An automatic sewing machine that moves and stops the fabric by a preset distance and number of times using a front presser foot and a rear presser foot that are spaced apart from each other in the front and rear of the cloth transport direction line passing through the sewing machine sewing section, and performs the specified sewing while the cloth is stopped. In the sewing device, an auxiliary presser is disposed at a position in front of the front presser and at the rear in the cloth transport direction, and after the first cloth feeding process, all the pressers including the auxiliary presser are returned to their original positions. 1. A presser foot device for an indexer, characterized in that an operation sequence program is configured so as to