JPS6340556B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing device that can automatically and continuously sew a sewn product over its entire circumference.

Conventionally, in the sewing process of sewn products, the sewn products were aligned by hand and sewn in the required curves and straight lines, but in the case of curved sewing, the sewn products are sewn while being rotated by hand, so the required curves are sewn. It requires intuition and skill to accurately sew along the line, and only an experienced person could perform this sewing work efficiently.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a sewing device that can automatically sew a sewn product, particularly sew all around the periphery including curved lines, without requiring any manual labor.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 indicates the sewing part of the sewing machine main body,
Reference numeral 2 denotes an outer presser foot attached to the presser bar 3, and 4 an inner presser foot attached to the presser bar 5, which are alternately moved up and down by the presser bars 3 and 5. An insertion hole 8 for a needle 7 attached to a needle bar 6 is bored in the inner edge of the inner presser foot 4, and the tip is bent upward and bulged inward, and the bulge 4a has a hole 8 for inserting a needle 7 attached to the needle bar 6. A slit-shaped guide groove 9 is formed. Reference numeral 10 denotes a feeder metal, which is formed to have approximately the same width as the inner presser foot 4, and has a needle hole 11 formed therein in correspondence with the needle insertion hole 8 of the inner presser foot 4. 12
1 is a sewing machine main body board, and a sewing machine table 13 is installed at the tip thereof. Guide rollers 14 and 15 are mounted on this sewing machine table 13 at a required distance from the feeder 10 of the sewing machine main body 1, and are suitably mounted over almost the entire surface. Trochanters 16a, 16b, 16c, .

The rapid feed device 17 has rollers 20 [20a, 20b, 20c] between the upper edges of the support plates 19 and 19'.
are horizontally spaced apart, and a roller 21 is disposed at the bottom, and a belt 22 is suspended from the rollers 20 and 21 so that the belt 22 protrudes from the upper edge of the support plates 19 and 19' at the part where it is suspended from the upper roller 20. A rotating shaft 24 of a motor 23 attached to the outer side of the support plate 19 is in rolling contact with the belt 22, and the belt 22 is configured to be rotated by the drive of the motor 23. This rapid feed device 17 has a window hole 13a formed in the sewing machine table 13, and is housed in a box-shaped frame 25 fixed to the lower surface side of the window hole 13a. A cylinder 27 is connected to the bottom of the body 25 in parallel by link pieces 26 and 26', and by operating this cylinder 27, the rapid feed device 17 is moved through the link pieces 26 and 26'. The belt 22 is pushed up, and the upper horizontal running portion of the belt 22 protrudes from the window hole 13a of the sewing machine table 13. The motor 23 and cylinder 27 of the feed device 17 are operated by pressing the fast feed operation switch 18 and turning it on.

28 is a tracing jig, which is formed by laminating a front plate 29, which is similar to the main body side sewn product A and is one size smaller, and a back plate 30, which is smaller than the front plate 29.
A guide groove 31 is formed along the shape of the surface plate 29, and a rough surface layer 29a is formed on the surface side of the surface plate 29. This tracing jig 28
is placed on the sewing machine table 13, and with the guide groove 31 engaged with the guide rollers 14 and 15, the surface plate 2 is
The edge 9 is located between the outer edge of the inner presser foot 4 and the feeder 10. When the sewing machine main body is driven in this state, the profiling jig 28 has a surface plate 29 that is attached to the inner presser foot 4.
and is moved by the feeder 10 along the locus of the guide groove 31 that is engaged with the guide rollers 14 and 15.

This movement of the profiling jig 28 is carried out smoothly by the back plate 30 being rolled into contact with the trochanters 16a, 16b, 16c, . . . When pressed and turned on, the rapid feed device 17 moves upward and the belt 22
is in contact with the back surface of the back plate 30, and the running of the belt 22 helps the tracing jig 28 to be moved by the sewing machine main body.

For this reason, this rapid feeding device 17 has a tracing jig 28.
The rapid feed operation switch 8 is operated when the tracing jig 28 moves at approximately the same speed as the linear movement. When the bent portion of the guide groove 31 reaches the position of the guide rollers 14 and 15, a part of the tracing jig 28 is placed in contact with it, and the contact of the tracing jig 28 turns on the rapid feed device 17. The cylinder 27 is activated and pushed up, and the belt 22 is pushed up against the back plate 3 of the tracing jig 28.
0, the motor 23 is activated and the belt 22 runs, and this fast feed operation switch 8 has a timer and is activated for a certain period of time.
That is, it operates while the profiling jig 28 is bent and rotated,
Thereafter, it is automatically turned off and the rapid feed device 17 is lowered and the motor 23 is stopped.

Next, the sewing operation performed by the sewing apparatus constructed as described above will be described with regard to sewing the outer skin of a seat cushion.

First, the sewing product A, that is, the bent part of the sheet cushion skin, is placed upside down on the surface of the tracing jig 28, and the peripheral seam allowance is made to protrude from the peripheral edge of the tracing jig 28. Outer presser foot 2 and inner presser foot 4 of sewing device 1 and feeder foot 1
0, then sewn product B, i.e. welt b
Insert the gusset part of the sheet cushion skin with the attached seam allowance edge into the guide groove 9 of the inner presser foot 4 along with the bead edge b, and then press the bent part A on the underside of the outer presser foot 2 and the inner presser foot 4. It overlaps in the seam allowance. In this state, by operating the sewing device 1 of the sewing machine main body, the sewing product A and the sewing product B are sewn together by the needle 7 along their shape, that is, the seam allowance, while being transferred by the above-described operation of the tracing jig 28. .

Since a rough surface layer 29a is formed on the surface side of the surface plate 29 of this leveling jig 28, the sewn product A
The tracing jig 28 is transferred integrally with the tracing jig 28 without shifting, and the tracing jig 2
8 is forcibly rotated by the rapid feed device 17, the sewn products A and B are transported at approximately the same speed as the transport speed of the straight seam section, and the stitches are uniformly spaced over the entire circumference. Sewn on.

In this example, two guide rollers are installed to which the guide groove 31 of the profiling jig 28 is engaged, but the number may be increased or decreased as necessary, such as by installing one or three. A trochanter for smoothing the rotation of the profiling jig 28 may be provided on the profiling jig side.
Furthermore, the contouring jig 28 can be used by selecting the outer shape and the shape of the guide groove 31 according to the shape of the sewn product. You may attach other strips without limitation, and if the edge of the sewn product B has appropriate hardness, insert it into the guide groove 9 and attach it to the sewn product A without attaching the welt b etc. It becomes possible to guide the object along the line.

As described above, the sewing device according to the present invention is provided with a profiling jig that corresponds to the sewing device of the sewing machine body and is rotated in the sewing direction over substantially the entire circumference of the sewn product in conjunction with the feed movement of the sewing device. Following the presser foot of the sewing device, one sewn product is placed on the jig so that the seam margin edge protrudes from the outer peripheral edge, and the other sewn product is guided to overlap at the seam margin edge. Since it is configured with a guide groove, by simply placing one side of the sewing product on the tracing jig and inserting the other side into the guide groove of the presser foot, the feed movement on the sewing machine body side and the rotation trajectory of the tracing jig can be adjusted. It is possible to automatically sew along the sewn parts, and compared to the conventional work of manually aligning the two sewn products and sewing them in the required curves and straight lines while rotating them, it is easier to sew only the sewn products together. It only requires extremely simple work, and even beginners can reliably obtain sewn products of the required quality with a constant seam allowance without relying on intuition or skill in sewing work, and the yield rate is significantly improved, among other practical effects. is large.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of an example of a sewing device according to the present invention, FIG. 2 is an example of a tracing jig, A is a front side perspective view, B is a back side perspective view, and FIG. 3 is a sewing machine. An enlarged sectional view taken along the line 4 in FIG. 1 in the state
The figure is an enlarged sectional view taken along the same line, FIG. 5 is an enlarged sectional view taken along the same line, and FIG. 6 is an explanatory view of the rotating state of the profiling jig. In the figure, 1 is the sewing device of the sewing machine body, 2 is the outer presser foot, 4 is the inner presser foot, 7 is the needle, 9 is the guide groove of the inner presser foot, 10 is the feeder, 12 is the sewing machine main body board, 13
is a sewing machine table, 14 and 15 are guide rollers, 2
8 is a tracing jig, 29 is a front plate, 30 is a back plate,
31 is a guide groove.

Claims (1)

[Claims] 1. A profiling jig is provided corresponding to the sewing device of the sewing machine main body, and is rotated in the direction of sewing approximately the entire circumference of the sewn product in conjunction with the feed movement of the sewing device, and on the presser foot of the sewing device, A guide groove is provided in the above-mentioned profiling jig to guide one sewn product, which is placed so that the seam margin edge protrudes from the outer peripheral edge, to overlap the other sewn product at the seam margin edge. A sewing device featuring: