JPH0615078A - Sewing device - Google Patents

Abstract

PURPOSE:To improve sewing workability of forming circumferential seams of different radii. CONSTITUTION:In case of sewing an object 4 such as an air bag with a sewing machine 1, by changing radii of circumferential seams in many ways, an object turn table 10 that retains the object 4 and is moved by a moving and driving motor 8 may be set at desired positions by controlling the motor 8 by a control device 23 without adjusting a stopper mechanism, and, therefore, sewing workability is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing device suitable for sewing an airbag mounted on an automobile, for example.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of sewing device,
There is a configuration described in Japanese Patent Laid-Open No. 3-170193. This structure is provided with a sewing means having a vertically movable sewing needle, and also mounts and supports a part piece of an airbag and enables a part of the part piece to be sewn in correspondence with the sewing means. By rotating the center of the part piece as the center of rotation, a rotating means for forming a circular stitch on the part piece is provided, and further, this rotating means is moved along the linear direction connecting the sewing means and the center of rotation. It has a moving device that supports it as much as possible. The moving device includes a moving table on which the rotating means is mounted and fixed, a rail for movably supporting the moving table, and a stopper mechanism for stopping the moving table at a predetermined position.

In the above structure, the part piece is placed on the rotating means, the movable table is moved to a predetermined position, and the stopper mechanism is adjusted so that the movable table is held at the stop position. After that, while rotating the part piece by the rotating means, a circumferential stitch is formed on the part piece by the sewing means, so that the airbag is sewn.

[0004]

By the way, when manufacturing airbags of different sizes, it is necessary to change the radial dimension of the circumferential stitches according to the size, and the stop position of the movable table must be changed. I have to. In such a case, in the above-described conventional configuration, the stopper mechanism has to be manually adjusted every time the stop position of the movable table is changed, and the adjusting work is very troublesome, so that the sewing workability is poor. There was a problem.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and an object thereof is to perform sewing when forming a circumferential stitch having various radial dimensions. It is to provide a sewing device capable of improving workability.

[0006]

In order to achieve the above object, a sewing apparatus of the present invention has a sewing means having a vertically movable sewing needle, and supports and mounts a material to be sewn.
Rotating means for forming a circumferential stitch on the sewn object by rotating the sewn object about its center while enabling a part of the sewn object to be sewn corresponding to the sewn means. And a movement drive means for moving the rotation means along a linear direction connecting the sewing means and the rotation center, and the rotation is performed by drivingly controlling the movement drive means. Control means is provided for setting the position of the means to the desired position.

[0007]

According to the sewing apparatus of the present invention having the above structure,
When performing sewing by changing the radial dimension of the circumferential stitch, it is possible to set the position of the rotating means to a desired position by drivingly controlling the movement driving means by the control means. . Therefore, unlike the conventional configuration, it is possible to eliminate the need for manual work for adjusting the stopper mechanism, so that the sewing workability is significantly improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 1 showing the overall configuration, a sewing machine 1 as a sewing means of the present invention comprises a sewing machine arm portion 2 and a sewing machine bed portion 3. For example, two sewing needles (not shown) are vertically movable at the left end of the sewing machine arm 2. A looper and a feed dog (neither of which is shown), which is a thread catcher driven in synchronization with the vertical movement of the sewing needle, are provided at the left end of the sewing machine bed portion 3. The looper and the feed dog are configured to form a double-needle double chain stitch seam.

On the left side of the sewing machine 1, there are two pieces 4 of parts constituting an article to be sewn according to the present invention, for example, an airbag.
A workpiece support device 5 for mounting and supporting (see FIG. 2) is provided. In the sewn product supporting device 5, a movable table 7 is supported on a guide rail 6 arranged so as to extend in the left-right direction so as to be movable in the left-right direction. In this case, the movement drive motor 8 which is the movement drive means of the present invention is arranged at the fixed portion on the guide rail 6 side. A rack 7a is attached to the lower surface of the moving table 7, and a pinion gear 9 attached to the rotary shaft of the moving drive motor 8 meshes with the rack 7a.

As a result, by moving the moving drive motor 8 forward and backward, the moving table 7 can be moved left and right. Particularly, in this case, the movement drive motor 8 is composed of a stepping motor and a servo motor, and the forward / reverse rotation amount (forward / reverse rotation angle) thereof can be controlled to a desired rotation amount, and the rotation thereof is In the stopped state, the rotation stop position can be held. That is, by controlling the drive of the moving drive motor 8, the moving base 7 can be stopped at a desired position in the left-right direction and held so as not to move from the stopped position.

A sewn object rotating device 10, which is the rotating means of the present invention, is disposed on the movable table 7. The sewn object rotating device 10 has a function of placing and supporting the part piece 4 and rotating the part piece 4 around the center thereof.

The sewn object rotating device 10 will be specifically described below. A rotation drive motor 11 is provided on the movable table 7 at the right end side of the sewing machine rotating device 10. A lower rotary plate 12 is arranged above the rotary drive motor 11 so as to be rotationally driven by the rotary drive motor 11. In this case, the rotary drive motor 11, that is, the lower rotary plate 12
Are rotationally driven in synchronization with the vertical movement of the sewing needle.

The part piece 4 is placed and supported on the lower rotary plate 12. In this case, a plurality of positioning pins 13 (shown by broken lines in FIG. 1) are provided on the upper surface of the lower rotary plate 12, and the positioning holes 4a (see FIG. 2) corresponding to the positioning pins 13 are provided on the part piece 4.
Is formed, and when the part piece 4 is placed on the lower rotary plate 12, the positioning pin 13 of the lower rotary plate 12 is fitted into the positioning hole 4a of the part piece 4 for positioning. ing.

An upper rotary plate 14 is provided above the lower rotary plate 12 so as to be vertically movable and rotatable. When the upper rotary plate 14 is moved downward, the lower rotary plate 12
The parts piece 4 placed on the top is pressed and clamped. Here, the upper rotary plate 14 is attached and fixed to the lower end of the rotary shaft 15, and the rotary shaft 15 is provided at the tip of the revolving arm 16 so as to be vertically slidable and rotatable. The swivel arm portion 16 has a base end portion which is erected at a left end portion on the movable table 7 and is capable of swiveling around an axis of the base end portion as a swing center.

A lever member 17 is provided on the upper part of the turning arm portion 16 so as to be rotatable around a fulcrum 18. The lever member 17 has a right end portion to which an upper end portion of the rotary shaft 15 is connected, and a left end portion to which a cylinder 19 is attached.
The upper ends of the rods 20 are connected. Cylinder 19
Is disposed on the outer surface of the base end of the swivel arm 16. By driving the cylinder 19, the rotary shaft 15 and thus the upper rotary plate 14 are moved in the vertical direction via the lever member 17. A pressing mechanism 21 is constituted by the upper rotary plate 14, the rotary shaft 15, the revolving arm portion 16, the lever member 17, the cylinder 19 and the like.

A part piece table 22 is arranged on the outer periphery of the upper rotary plate 14 on the moving table 7. The parts piece table 22 has a substantially semi-circular shape, and has a concave portion for accommodating the rotary drive motor 11 and the upper rotary plate 14 at the center thereof. Above parts piece table 2
The peripheral edge of the part piece 4 is placed and supported on the second part 2.

On the other hand, a control device 23 for controlling the overall sewing operation is arranged at the right end portion of the sewing machine bed portion 3 described above. The control device 23 includes an operation panel on which various operation switches are arranged, a control circuit (not shown) including a microcomputer, and a storage device 24. The movement control motor 8, the rotation drive motor 11 and the sewing machine motor (not shown) are drive-controlled by the control circuit of the control device 23. In this case, the control device 23 constitutes the control means of the present invention.

Further, the storage device 24 is adapted to store the sewing data created by the data creating device 25. The sewing data is composed of data for instructing a position, etc., at which the moving table 7, that is, the sewing machine rotating device 10 is moved and stopped in accordance with the size of the part piece 4. In addition, the data creation device 25 is the keyboard 2
6 and a display 27.

Next, the operation of the sewing machine thus constructed will be described. Before starting the sewing operation, sewing data is created in advance by the data creating device 25 according to the size of the part piece 4 to be sewn and stored in the storage device 24.

Then, the cylinder 19 of the pressing mechanism 21 is driven to move the upper rotary plate 14 upward, so that the two part pieces 4 are placed on the lower rotary plate 12. At this time, the lower rotary plate 1
The positioning pin 4 of 2 is fitted into the positioning hole 4a of the part piece 4 for positioning. Further, the peripheral portion of the part piece 4 is placed and supported on the part piece table 22. After that, the cylinder 19 is driven to move the upper rotary plate 14 downward, and the upper rotary plate 14 presses the part piece 4 on the lower rotary plate 12.

When the operation is started in the pressed state, the control device 23 reads the sewing data stored in the storage device 24, and based on the sewing data, rotationally drives and controls the movement drive motor 8 to move. The table 7 is moved to the right, and the sewing portion of the part piece 4 is moved to a position corresponding to the sewing needle of the sewing means 1 and stopped at that position. Subsequently, the sewing machine motor and the rotary drive motor 11 (not shown) are rotationally driven, the sewing needle is moved up and down, the looper is swung, and the part piece 4 is moved by the feed dog, and the lower rotary plate 12 is moved. As a result, the part piece 4 is rotated about its center. In this case, the lower rotary plate 1
2 or the part piece 4 is rotationally driven in synchronization with the vertical movement of the sewing needle.

As a result, circumferential seams are formed on the peripheral edge of the part piece 4. Then, when the sewing of the circumferential stitch is completed, the sewing machine motor and the rotary drive motor 11
Is stopped and thread cutting is performed, then the movement drive motor 8 is rotationally controlled to move the movement base 7 to the left, and the movement base 7 is returned to the original position (origin position). After that, by repeating the above-described work, a circumferential stitch is formed in each required portion of the part piece 4, and the sewing is completed.

When sewing pieces 4 of different sizes, not only the sewing data is changed, but also the lower rotary plate 12 and the upper rotary plate 14 are sized so that each diameter dimension is suitable for the part piece 4. It may be configured to be changed to one.

According to this embodiment having such a structure, when the radial dimension of the circumferential stitch is variously changed to perform the sewing, the controller 23 drives the movement drive motor 8 based on the sewing data. The position of the movable table 7, that is, the sewn object rotating device 10 is set to a desired position by driving and controlling, and it is possible to form a circular stitch having a required radial dimension. Therefore, unlike the conventional configuration, it is possible to eliminate the need for manual work such as adjusting the stopper mechanism according to the size, so that the sewing workability is significantly improved.
In the case of the present embodiment, it is necessary to create sewing data with the data creating device 25.
This is a very simple work as compared with the work of adjusting the stopper mechanism having the conventional configuration.

Further, in the above embodiment, the movable base 7 is stopped during the sewing for forming the stitches to form the circumferential stitches. However, the present invention is not limited to this. Alternatively, the movable table 7 may be appropriately moved to form a spiral stitch.

[0026]

As is apparent from the above description, the sewing apparatus of the present invention is provided with the movement driving means for moving the rotation means along the linear direction connecting the sewing means and the rotation center, and the movement driving means. Since the control means for driving and controlling the means to set the position of the rotating means to a desired position is provided, when performing sewing to form circumferential stitches with different radial dimensions, the sewing operation is performed. It has an excellent effect that workability can be improved.

[Brief description of drawings]

FIG. 1 is an overall front view showing an embodiment of the present invention.

[Figure 2] Top view of the part piece

[Explanation of symbols]

1 is a sewing machine (sewing means), 2 is a sewing machine arm part, 3 is a sewing machine bed part, 4 is a part piece (sewn product), 5 is a sewing device support device, 7 is a moving base, 8 is a movement drive motor (moving). Drive means), 10 is a sewing machine rotating device (rotating means), 11
Is a rotary drive motor, 21 is a holding mechanism, 23 is a control device (control means), 24 is a storage device, and 25 is a data creation device.

Claims (1)

[Claims] 1. Sewing means having a vertically movable sewing needle; and a sewing object for placing and supporting the sewing object, and enabling sewing of a part of the sewing object in correspondence with the sewing means. In a sewing device comprising a rotating means for forming a circumferential stitch on the material to be sewn by rotating the material around the center of rotation, the rotating means comprises the sewing means and the rotation center. A sewing machine comprising: a movement driving means for moving and driving along a straight line connecting the two; and a control means for driving and controlling the movement driving means to set the position of the rotating means to a desired position. .