JPS6226798B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing device that can easily perform curved stitches when sewing pockets, clothes, etc. with a sewing machine.

Conventionally, when sewing pockets and the like using a sewing machine, a worker or the like would hold the pocket with their hands, and when sewing curved lines along the edges, they would turn the pocket with their hands as they sewed. However, such curve stitching, which is manually turned by an operator, requires skill on the part of the operator, and it is extremely difficult to form a neat and uniform curve. Furthermore, it requires even more skill and difficulty to perform straight stitches continuously as needed during work.

This invention was made in view of these points, and instead of turning the sewing object such as a pocket by hand in the conventional method, the sewing machine presses the sewing object from above and uses the feeding device of the sewing machine around this as an axis. This product provides a sewing device that automatically rotates the workpiece and can sew curved lines.This device has an extremely simple structure, does not require any skill, can easily and reliably sew neat curves, and can also sew uniform curves. It has characteristics such as being suitable for mass production.

The structure of the present invention is such that a slide shaft, which has a presser plate removably attached at its lower end that can be freely contacted on the sewing surface of the sewing machine, slides and locks in a vertical direction on the sewing machine body so as to be located beside the needle of the sewing machine. The presser plate is supported to be freely rotatable in the horizontal direction, and a weight is detachably provided on the top of the slide shaft, and the presser plate has a curved edge corresponding to the curve to be sewn and consisting of an arc centered on the slide shaft. The outer edge of this presser plate is located near the needle, and a presser foot provided beside the needle of the sewing machine is provided separately from the presser plate, and the feed device is connected to this presser plate on at least one side. It is located below the presser foot.

An embodiment of the present invention will be described below with reference to the drawings. 1 is the main body of the sewing machine, 2 is the needle of the sewing machine, 3 is a presser foot also provided on the side of this needle 2, 4 is a protruding support provided on the outside of one end of this sewing machine main body 1, and 5 is attached to this protruding support 4. The mounted driving device 6 is a slide shaft that vertically passes through this protruding support 4 and is rotatably provided. It slides vertically. Reference numeral 7 denotes a presser plate removably attached to the lower end of the slide shaft 6. The presser plate 7 has a curved edge 7a on one side that roughly corresponds to the curve to be sewn, and the terminal end of the curved line 7a. It has a protruding piece 7b, and a file to prevent slipping is attached to the lower surface. Reference numeral 8 denotes a weight removably installed at the upper end of the slide shaft 6, and 9 is a conveyor belt-shaped cloth pulling roller located behind the presser plate 7 in FIG. It is connected to a motor 11 via a device 10, thereby driving the rotation.
12 is a sewing surface of the sewing machine body 1; 13 is a feeding device provided on the sewing surface 12 below the needle 2; 14 is an arm protruding from the side of the presser foot 3; the tip of this arm 14 is a bifurcated section; is formed, and the slide shaft 6 is inserted into the bifurcated portion. Reference numeral 15 denotes a locking body which is fixed to the outer periphery of the slide shaft 6. When the presser foot 3 is pulled up from the sewing surface 12, the forked portion of the arm 14 pushes up the lower surface of the locking body 15, and the slide shaft 6 is raised, and the presser foot plate 7 is pulled up from the sewing surface 12. Reference numeral 16 denotes a lock pin whose tip is removed from the lower surface of a locking tube 17 fixed to the outer periphery of the slide shaft 6 by the action of a solenoid in the drive device 5 on the protruding support 4;
This lock pin 16 is pivotally mounted on the projecting support 4. Then, the slide shaft 6 is connected to the presser foot 3.
When the lock pin 16 is raised in conjunction with the rise of the locking tube 17, the lock pin 16 is automatically locked to the lower surface of the locking tube 17, and the slide shaft 6 is locked in the raised position.
Furthermore, when the slide shaft 6 rises, it is rotated upward by a spiral guide (not shown), and the presser plate 7 returns to its normal position and is locked as described above.

When sewing a pocket using this sewing device, for example, the pocket material 20, which is folded on one side and overlapped on the other side, is placed on the sewing surface 12 under the needle 2 and the presser foot 3, and then the presser foot is attached as shown in FIG. 5A. Put down 3. At this time, the presser plate 7 does not descend onto the pocket material 20 because the slide shaft 6 is locked by the lock pin 16. Then, drive the sewing machine main body 1 and
As shown in Figure A, a straight line is sewn along the straight edge 21a of the mating edge 21 of the pocket material 20. At this time, the pocket material 20 is fed by a feeding device 13 below the needle 2 of the sewing machine body 1. And Figure 4B
As shown in FIG. 2, when the stitches are sewn to the end of the straight edge 21a and immediately before entering the curved edge 21b, a drive control device (not shown) is activated by counting a preset stitch count counter (not shown). Drive device 5
The solenoid is activated, the lock pin 16 rotates, the slide shaft 6 is separated from the locking tube 17, the lock is released, and the slide shaft 6 falls downward due to the weight of the weight 8. As a result, as shown in FIG. 5B, the presser plate 7 falls onto the pocket material 20, and the pocket material 2
0 is pressed onto the sewing surface 12. However, the slide shaft 6 of this presser plate 7 is free to rotate at this position, and the feeder 1 of the sewing machine body 1
3, the pocket material 20 is pulled, so that the pocket material 20 rotates around the slide shaft 6 of the presser plate 7. Since the center of the arc of the curved edge 21b of the pocket material 20 is aligned with the slide shaft 6, the needle 2 is moved along the curved edge 21b of the mating edge 21 of the pocket material 20, as shown in FIG. 4C. I will have to sew it. Then, when sewing this curved edge 21b, the stitches are counted, and when the needle 2 reaches the end of the curved edge 21b as shown in FIG. The pressure on the pocket material 15 by the pocket member 7 is released. At this time, the presser plate 7 and slide shaft 6 are rotated and raised by a spiral guide (not shown), and the presser plate 7 returns to its home position (dotted chain line shown in FIG. 4D), and the lock pin 16 is automatically moved. The slide shaft 6 is then locked to the lower surface of the locking tube 17. Thereupon, the pocket material 20 stops rotating, and in that position, is sewn along the straight edge 21a' while being fed only by the feeding device 13, and the tip of the cloth-pulling roller 9 descends into contact with the end of the pocket material 20. ,
The rotation of the roller pulls the pocket material 20 toward the rear of the sewing machine body 1. In this manner, the joining edge 21 of the pocket material 20 is sewn.

In this embodiment, not only the pocket material 20 but also an appropriate material to be sewn is mounted on the presser plate 7 provided at the lower end of the slide shaft 6.
While holding the workpiece with
This machine performs curved stitches on the material to be sewn by rotating the presser foot 7 around the
The structure is extremely simple, and it is possible to reliably perform beautiful curved stitches. Therefore, unlike the conventional method in which the workpiece is turned by hand, no skill is required, and neat curved stitches can be made uniformly. Further, this presser plate 7 has a curved edge 7a that matches the curve to be sewn, and this curved edge 7a
Since the needle 2 is positioned close to the needle 2 and the lower surface of the presser plate 7 is filed as described above, the coated product will not be torn or wrinkled.
In addition, by changing to a presser plate 7 of a different shape so that the slide shaft 6 is located at the center of the arc of the curve to be sewn, or by making the slide shaft 6 movable in the horizontal direction, it is possible to sew a curve of a desired diameter. Further, the presser plate 7 of the present invention must press the workpiece and rotate the workpiece by the pulling force of the feed device of the sewing machine.
are detachable, and the weight of the presser plate 7 can be adjusted by changing the number of weights 8.

In the above embodiment, a counter or the like is used to count the number of stitches so that all straight and curved stitches can be automatically performed. You can also perform straight and curved stitches by controlling the vertical movement.

Further, in the above embodiment, the presser plate 7 is free to rotate when it presses the object to be sewn, but instead of this,
The presser plate 7 may be rotated by an appropriate drive device in synchronization with the feed device 13 of the sewing machine. If the diameter of the curve to be sewn is to be made small, the presser plate 7
All you have to do is make the rotation faster.

As described above, this invention differs from the conventional method in which a worker rotates the workpiece by hand to sew curved lines.
By mechanically holding down the workpiece and rotating it, it is possible to stitch curved lines of a desired diameter extremely neatly and reliably, and it is also suitable for mass production because it can stitch uniformly curved lines. In addition, the presser foot of the sewing machine needle can press the fabric independently from the presser foot on the slide shaft, so if you lift the presser foot on the slide shaft upwards and release it from the fabric, you can continue sewing straight curves. It can be done by

[Brief explanation of the drawing]

The figures show embodiments of the present invention; FIG. 1 is a front view of the invention, FIG. 2 is a perspective view of essential parts of the invention,
Figure 3 is a side view of this invention, Figure 4 A, B, C,
5A and 5B are front views of essential parts of the present invention when the invention is in use, respectively. In the figure, 1 is the sewing machine body, 2 is the needle, 3 is the presser foot, 6 is the slide shaft, 7 is the presser foot plate, 8 is the weight, 1
2 is a sewing surface, 13 is a feeding device, 14 is an arm, 1
6 is a lock pin, and 20 is a pocket material.

Claims (1)

[Claims] 1. Slide the slide shaft, which has a presser foot that can be freely contacted on the sewing surface of the sewing machine and is removably installed at the lower end, in a direction perpendicular to the sewing machine body so that it is positioned beside the needle of the sewing machine.
It is supported so that it can be locked and rotated in the horizontal direction, and a weight is detachably provided on the top of the slide shaft. The presser foot has a curved edge on at least one side, and the outer edge of the presser foot is located near the needle, and a presser foot provided beside the needle of the sewing machine is provided separately from the presser foot, and the feeder is located below the presser foot.