JPH0344556B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sewing device that is equipped with an overlock sewing machine and is capable of sewing curved edges.

PRIOR ART It is well known to form a curved seam on a workpiece by moving the workpiece or a sewing machine in the x-axis and y-axis directions using a control device.
As shown in No. 19195, there is also known a device that forms curved seams by moving the sewing machine forward and backward while rotating the material to be sewn. There is no known sewing device that can do this. For example, the shoulder patch stitching process (in this process, a lockstitch is used to sew the shoulder patch around the folded part of the shoulder patch with the interlining folded in half, and then a one-needle overlock sewing machine is used. Conventionally, when it is necessary to perform edge stitching on curved edges, as in (2), it has been done manually by manipulating the material to be sewn. It is not easy to manipulate the workpiece while maintaining its spatial form, such as edge stitching along a curved line, which requires considerable skill and tends to result in uneven finishes. A uniform sewn product could not be obtained.

Problems to be Solved by the Invention In an overlock sewing machine, even if either the sewing machine or the workpiece is moved in the X-axis direction or the Y-axis direction, a curved edge stitch is formed. I can't. In overlock sewing machines, the edge stitch is formed like a claw that extends in the feeding direction along the needle hole in the throat plate, and it gradually slips out from the claw as the fabric is fed.
In order for the stitches to pass through the nails successfully, the direction in which the nails extend and the direction in which they come out, that is, the direction in which the fabric is fed, must match. Furthermore, in many cases, overlock sewing machines perform hem stitching while trimming the edges of the fabric with a knife placed immediately to the side of the needle hole, so if the fabric is fed diagonally, the cut edges will be uneven. Therefore, with an overlock sewing machine, it is necessary to match the tangential direction of the stitching trajectory with the cloth feed direction, but if the stitching trajectory is a curve, even if the position can be moved diagonally by driving in the XY axis directions, the stitching This is because the tangential direction of the locus and the cloth feeding direction cannot be made to coincide.

The present invention provides a sewing device capable of forming a curved edge hem by controlling the movement of an overlock sewing machine so that the tangential direction of the sewing locus coincides with the cloth feeding direction. With the goal.

According to the present invention, a clamping device that clamps a workpiece to be sewn, and a drive body in the X-axis direction and a drive body in the Y-axis direction in a coordinate system consisting of mutually orthogonal XYZ axes can move in a plane. a supported table; an overlock sewing machine disposed on the table so as to be able to rotate in θ about a Z axis passing through the center of the needle hole; a motor for rotating the main body of the overlock sewing machine in θ; and the clamp device. , a control device for controlling the operation of a drive body, an overlock sewing machine, and a motor, the sewing machine having a sewing machine so that the tangent to the sewing trajectory along the circumference of the workpiece clamped by the clamping device coincides with the direction of the nail on the throat plate. A sewing device is provided in which the peripheral edge of a workpiece is moved while an overlock sewing machine is rotated by θ.

When the X-axis and Y-axis driving bodies are configured with a servo motor and a ball screw directly connected to the shaft, good results can be obtained in terms of response speed, operation accuracy, etc.

In addition, the motor for θ rotation is also a servo motor,
If the motor shaft is aligned with the Z-axis that passes through the needle hole of the overlock sewing machine and a direct drive is used, the structure is simple, does not take up much space, and is excellent in accuracy. As shown in Japanese Patent Application Laid-open No. 19195/1982, a device that rotates a clamp device, a mechanism that moves the overlock sewing machine forward and backward, and a device such as a servo motor that rotates the overlock sewing machine by θ around the Z axis. For example, Note that the overlock sewing machine can be rotated by θ around the Z-axis by using a belt transmission or gear transmission using a servo motor, etc., but preferably a direct drive method in which the overlock sewing machine is rotated directly by a servo motor etc. is adopted. .

Embodiment The figure shows an example of an automatic case stitching device for shoulder patches, in which a ball screw 4 is pivotally supported on a rectangular frame 2 mounted on a base 1 and screwed into a movable body 3. Guide shafts 5 that are slidably inserted into the movable body 3 are arranged on both sides thereof,
When the ball screw 4 is rotationally driven by a DC servo motor 6 attached to the shaft end of the ball screw 4, the movable body moves left and right in the X-axis direction in the figure. Like the frame 2, the movable body 3 also includes a ball screw 8 with a DC servo motor 7 attached to the shaft end, a guide shaft 9 disposed on both sides of the ball screw 8, and a ball screw 8 screwed into the ball screw 8 and a guide shaft 9 passed through the ball screw 8. Movable body 1
1 is attached perpendicularly to the frame 2, and when the ball screw 8 is rotationally driven by the servo motor 7, the movable body 11 moves back and forth in the Y-axis direction. Reference numeral 13 denotes a servo motor attached to a table 14 fixed to the movable body 11. A disk 15 rotatably driven by the motor 13 is attached on the servo motor, and a presser foot is mounted on the disk 15. The vertical axis (Z
The DC servo motor 13 is installed so that the rotation axis of the DC servo motor 13 coincides with the rotation axis of the DC servo motor 13. 17 is a cloth 1 with interlining 18 folded in half as shown in FIG.
It is an openable/closable clamp that presses the periphery of the interlining excluding the bent part of the shoulder patch 20 that is wrapped in the shoulder patch 20. It rotates 90 degrees around the shaft 22 by a rotary actuator (not shown) built in the box 21, and It is possible to switch between the suturing position shown in FIG. 1 and the position where the shoulder pad 20 is put on and taken off. Reference numeral 23 denotes a control box that incorporates the various servo motors, the overlock sewing machine, and a control device for controlling the opening and closing of the clamp.The storage device built into the control device converts the sewing curve along the clamp 17 into a digital signal, and performs sewing. The data is entered in advance.

Function The shoulder patch stitching according to this embodiment is performed as follows.

The first clamp 17 clamps the shoulder patch 20 by pressing the button on the control box 23.
The overlock sewing machine 16 is then switched to the suturing position shown in the figure, and then the overlock sewing machine 16 is brought to the suturing starting position, that is, the needle is brought close to the clamp 17, and the direction of the claw (not shown) on the throat plate is aligned with the tangent to the suturing trajectory. Then, the overlock sewing machine 16 is set.
Then, each servo motor 6, 7, and 13 is driven based on the sewing data stored in the storage device, and the overlock sewing machine 16 advances and retreats in the x-axis and y-axis directions, and further rotates by θ around the Z-axis. Clamp 1
7, always oriented in the tangential direction of the clamp 17. As a result, a double-needle edge stitch is formed along the clamp 17, that is, around the circumferential edge of the shoulder pad 20 excluding the bent portion.

According to this embodiment, the cover stitching process for shoulder pads, which conventionally required two processes: lock stitching and stitching using a single needle overlock sewing machine, can now be completed by using a double needle overlock sewing machine. It will be possible to do it automatically during the process.

In the description of the above embodiment, the overlock sewing machine has been described in terms of controlling the forward and backward movement in the X and Y axis directions, the θ rotation in the Z axis, and the rotation (of the main shaft) of the overlock sewing machine. Alternatively, a ball screw may be protruded from table 11 and the overlock sewing machine may be moved up and down by the rotation of the ball screw, thereby moving the overlock sewing machine not only in the x and y axis directions but also in the z axis direction. .

In the above embodiment, the shoulder patch is also covered stitched, but if you store any curved line as sewing data in the storage device, you can stitch the edges of any arbitrary curved line. It can be performed.

Effects of the Invention According to the present invention, as described above, the entire overlock sewing machine is moved back and forth in the XY-axis directions along the periphery of the workpiece clamped by the clamp device, and the Z By turning θ around the axis, the tangent line of the sewing locus of the workpiece is aligned with the direction of the needle plate claw of the overlock sewing machine, so any curve can be moved according to the set program. You can perform edge stitching.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a suturing device that is an embodiment of the present invention, and FIG. 2 is a side view of a main part of a clamp device in the same device. 6, 7, 13...DC servo motor, 14...
Table, 15... Disk, 16... Overlock sewing machine, 17... Clamp, 20... Shoulder patch.

Claims (1)

[Claims] 1 The clamp device that clamps the workpiece and the
A table supported so as to be movable in a plane by a driving body in the axial direction and a receiving conductor in the Y-axis direction; A lock sewing machine, a motor for rotating the overlock sewing machine main body by θ, the clamp device, a driving body,
The overlock sewing machine is equipped with a control device for controlling the operation of an overlock sewing machine and a motor, and the overlock sewing machine is operated so that the direction of the claw of the throat plate coincides with the tangent of the sewing locus along the periphery of the workpiece clamped by the clamp device. A sewing device that moves the periphery of a workpiece while rotating by θ.