JPH0344549B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cloth conveyance mechanism of an automatic sewing machine for sewing a plurality of buttonholes on the front body of a dress shirt.

Prior Art This type of device is a sewing device for making continuous buttonholes on the front of a shirt.
A device has been proposed that moves the head of a sewing machine from right to left to search for the buttonhole position and stitch the holes (see Japanese Patent Publication No. 59-36546).

Problems to be Solved by the Invention However, in this conventional automatic sewing machine, it is difficult to perform accurate indexing because the heavy head is moved at high speed, and it is difficult to perform accurate positioning. There were problems in that complicated equipment was required and maintenance costs for the shock absorbers, cylinders, etc. were high.

Additionally, when replacing the bobbin, the fabric holding table, fabric clamping device, etc. cover the throat plate surface of the bed of the sewing machine head, making it difficult for the operator to replace the bobbin, as the operator has to fumble with his or her fingers. It was hot.

Furthermore, for the body of a shirt with a narrow width, the side bars of the stacker could not hold down the edges of the fabric, resulting in stacking errors.

In addition, only the hole connections of vertical buttonholes were targeted, and it was not possible to make the buttonholes correspond to the hole connections of horizontal holes.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention moves a clamp table, which holds cloth by a clamp device, to the side of a sewing machine mounted on a stand table, and performs sewing. In an automatic sewing machine that performs When the clamp table is transported, the clamp table and the clamp device are fixed at a position close to the sewing machine.

Effect According to the present invention, the clamp base on which the cloth is supported by the clamp device is rotatably supported by the conveyor, and when replacing the bobbin attached to the sewing machine base, the clamp base is moved from the side of the sewing machine. kept away,
During sewing, it is fixed in a position close to the side of the sewing machine.

Embodiment FIG. 1 shows a fabric conveyance mechanism of an automatic sewing machine according to an embodiment of the present invention, in which a sewing machine head 2 is placed on a pedestal table 1.
is fixed, a needle 3 is provided in the sewing machine head 2, and a bobbin 4 is installed in the sewing machine bed. A clamp stand 5 is provided on the side of the sewing machine head 2, and a cloth is held on the clamp stand 5 by a clamp device 6. The clamping table 5 and the clamping device 6 are supported by a connecting arm 7, and the connecting arm 7 is supported on the carrier 9 by a shaft 8 so as to rotate together with the locking arm 10. Further, the conveying body 9 is supported by conveying shafts 11 and 12 so as to be slidable in its axial direction, and a gear 14 of a pulse motor 15 is engaged with a rack 13 fixed to the conveying body 9.
Further, a latch 17 is rotatably supported on the carrier 9 by a shaft 16, and is engaged with or separated from the tip of the lock arm 10 by a cylinder 18. Further, the lock arm 10 is always pulled by the spring 19, but its rotation is restricted by the stopper 20. A presser arm 21 is rotatably attached to the conveyor shaft 12 of the conveyor 9, and a cylinder 23 provided at the bottom of the presser arm 21 is operated to rotate the presser shaft 22 of the presser arm 21, thereby rotating the lock arm 10. be moved.

In addition, 28 is a loading table on which the cloth 27 after sewing is stacked, and 24 is fixed to the connecting arm 7 in order to press the middle part of the cloth 27 hanging down from the clamp table 5 to one side of the loading table 28. The side bar 29 is a stacking bar that reciprocates between the two positions shown in FIG.

In the automatic sewing machine of this embodiment configured as described above, the lock arm 10 is connected to the latch 1 as shown in FIG.
7, the clamp table 5 and the clamp device 6 are engaged by driving the pulse motor 15.
are moved together with the carrier 9 in the axial direction of the carrier shafts 11 and 12. Here, the number of times the bobbin winding amount is consumed is counted, and under signal control from the central processing unit CPU of the microcomputer, the conveyor 9
When replacing the bobbin 4, when the bobbin 4 returns to its original position and stops, first, the cylinder 18 disengages the lock arm 10 and the latch 17, and then the cylinder 23 is actuated to move the lock arm 10 and the connecting arm 7 to the first position. Rotate clockwise as shown in Figure 1. This moves the clamp base 5 and clamp device 6 away from the side of the sewing machine, allowing the operator to easily take out the bobbin 4 from the bed 2a of the sewing machine head 2. Furthermore, when the width of the fabric is narrow, if the clamp table 4 is similarly moved when stacking the fabric, the side bar 24 presses the fabric 27 to one side of the loading table 28, which causes the stacking bar 29 to move. When moved to the position indicated by the two-dot chain line in FIG. 1, stable stacking becomes possible.

2 and 3 are perspective views of a part of the cloth conveyance mechanism of an automatic sewing machine according to another embodiment of the present invention.
An arm 26 is fixed to the tip of a feed shaft 25 provided in the bed 2a, and this arm 26 is slightly protruded from a hole 2b provided in the bed 2a. and face each other.

Next, the operation of this embodiment will be explained. First, when the clamp base 5 and the clamp device stop and the sewing machine starts stitching, the lock arm 10 is pulled by the spring 19 by releasing the latch 17 shown in FIG. 1 just before the sewing machine presser foot is lowered. As a result, the connecting arm 7 rotates, and the edge of the clamp base 5 is connected to the arm 2.
Touches 6. When the sewing machine starts, the fabric 27 is pressed against the feed plate 31 by the presser foot 30 and moves in the direction of the arrow, and at the same time, the clamping table 5 and clamping device 6 are also rotated around the shaft 8 by the connecting arm 7. ,
It synchronizes with the movement of the sewing machine's presser foot.

In this embodiment, by moving the fabric 27 perpendicularly to the conveying direction in this manner, it is possible to perform hole-stitching of horizontal buttonholes.

Effects of the Invention As is clear from the above explanation, the present invention moves a lightweight clamping table and clamping device without moving the heavy sewing machine head, so the fabric can be accurately indexed using an inexpensive pulse motor. And it can be transported quickly. Further, by moving the clamp stand and the clamp device in a direction away from the side of the sewing machine, the bobbin can be easily accessed when replacing the bobbin. Furthermore, by simply adding a simple mechanism, it becomes possible to apply a stacking device for laterally transporting short bodies. Furthermore, by adding a simple mechanism to oversewing long buttonholes in a direction that intersects with the direction in which the buttonholes are arranged, it can be easily applied by using the clamp table and the horizontal feed of the clamping device. Not only does it have an excellent function as a fabric delivery mechanism, but it also has excellent adaptability to various attached mechanisms.

[Brief explanation of drawings]

FIG. 1 is a side view of a cloth conveying mechanism according to one embodiment of the present invention, FIG. 2 is a perspective view of a part of an automatic sewing machine according to another embodiment of the present invention, and FIG. 3 is a sectional view of FIG. 2. It is. 1... mount table, 2... sewing machine head, 3...
...Needle, 4...Bobbin, 5...Clamp stand, 6...
Clamp device, 7... Connecting arm, 8... Shaft, 9...
Transport body, 10... Lock arm, 11, 12... Transport shaft, 13... Rack, 14... Gear, 15
...Pulse motor, 16...Axis, 17...Latch, 18...Cylinder, 19...Spring, 20...
Stopper, 21... Presser arm, 22... Presser shaft, 2
3...Cylinder.

Claims (1)

[Claims] 1. In an automatic sewing machine that sequentially sews a plurality of buttonholes in the longitudinal direction of the fabric by moving the clamp table 5 holding the fabric 27 by the clamp device 6 on the side of the sewing machine, The clamp table and the clamp device are attached to a conveyor 9 supported by parallel conveyor shafts 11 and 12 and vertically fed along the conveyor axes by drive devices 15, 14 and 13 in a direction crossing the conveyor axes. Fixing means 10, 17, 18, 23 that support the clamp table so that it can be moved horizontally and also fix the clamp table and the clamp device at a position close to the sewing machine in the horizontal feed direction when the clamp table is fed vertically along the conveyance axis. A cloth conveyance mechanism for an automatic sewing machine, characterized in that it is provided with.