JPS6351718B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a buttonhole, and in particular, the present invention relates to a method for forming a buttonhole, and in particular, the sewing shape of two areas on both the left and right sides sandwiching the center line of a buttonhole is maintained in a well-balanced manner. The present invention relates to a buttonhole forming method that beautifully forms buttonholes by not creating gaps between gaps.

A buttonhole is known that has two hemlock parts located in two regions on the left and right sides, a bartacking part stop connected to both hemlock parts at one end, and an annular part connected to both hemlock parts at the other end. ing. For such buttonholes, a buttonhole presser and a position detection device operated by the buttonhole presser are generally used, and the position of both ends of the hemming area, which determines the actual length of the buttonhole, is determined by the actual length of the workpiece fabric. It is designed to be determined mechanically according to the feed rate.

However, in such a conventional buttonhole forming method, the feeding efficiency differs depending on the feeding direction of the work cloth, so when the parts located at symmetrical positions in the two regions are sewn in different work cloth feeding directions, had a drawback that the number of stitches (stitch density) on the left and right sides was different, which could impair the aesthetic appearance of the buttonhole.

In order to solve this drawback, it has been proposed to sew each part in the two regions on both the left and right sides in the same feeding direction of the work cloth. However, in such cases, instead of forming continuous annular parts located in the two left and right areas in the same circumferential direction, the annular parts belonging to different areas are sewn in different directions in the same work cloth feeding direction. When each step is formed, it is usually inevitable that the sewn part will shrink slightly due to the tension of the thread.
This creates a gap between the annular portions of the left and right regions, resulting in an unsightly buttonhole.

The present invention has been made against the background of the above-mentioned circumstances, and its purpose is to maintain the balance between the left and right stitches by substantially equalizing the stitch density on the left and right sides bordering the center line of the buttonhole, and to If the annular parts of the parts belonging to the left and right areas sandwiching the center line of the buttonhole are formed separately using different sewing steps, no gap will be formed between the annular parts of the parts belonging to the left and right areas. To provide a buttonhole forming method for forming buttonholes beautifully in this manner.

In order to achieve such an object, the buttonhole forming method of the present invention includes: (1) a first step of forming a stitch having no stitch width from the one end to the other end in one of the two regions; (2) a second step of forming a stitch of at least one stitch in the other region of the two regions where the annular portion is located; (3) forming the stitch in the one region; (4) a third step of forming a half of the annular region and an overcast region connected thereto; and (5) a fourth step of forming a seam having no width from the one end to the other end in the other region. At least one region in the one region where half of the already formed annular portion is located.
(6) a sixth step of forming the remaining half of the annular portion and an overcast portion connected thereto in the other region;
and (7) a seventh step forming a bar-tacking part on the one end that spans the two hem-over parts.

By doing this, in the third step and the sixth step, the left and right hem portions located symmetrically across the center line of the buttonhole are formed in succession to the annular portion and in the same work cloth feeding direction. The sewing of the left and right hemlock areas is done with the same processing cloth feed efficiency, and the number of stitches (stitch density) in the left and right hemlock areas is approximately equal, maintaining a good balance in appearance between the left and right sides. It will be done.

In addition, in the case where the annular parts belonging to the left and right areas sandwiching the center line of the buttonhole are not formed continuously in the circumferential direction, but are formed separately in different sewing steps in the same work cloth feeding direction, , the annular parts of the parts belonging to one region are formed after at least one stitch worth of stitches are formed in the regions to which the annular parts of the other parts belong, so that the annular parts of both the left and right parts are formed. Since the stitching is performed so that the sewing threads intersect between the buttons, gaps are prevented from being formed between the annular sections on both the left and right sides, and the buttonhole is formed in an extremely beautiful manner.

Here, since the stitches having no stitch width are used to determine the actual length of the buttonhole in the longitudinal direction, not only straight stitches but also triple stitches, chain stitches, etc. can be used. It is.

Further, the hemline area refers to an area where the sewing distance is determined by the operation of a position detection device that detects the position of the workpiece cloth in cooperation with the buttonhole presser foot.

Further, since the buttonhole has a continuous annular portion at the other end of the overlocking portion, it may be not only a so-called eyelet buttonhole but also a sleep buttonhole or the like.

An example of the method of the present invention will be described in detail with respect to the eyelet buttonhole sewing shown in FIG.

In Fig. 1, a narrow longitudinal part A with no seams is provided to form a cut through which the button is passed, and two areas on the left and right sides sandwiching the center line B of the part A are provided. , two hemlocking parts 10 and 12 provided symmetrically and along the center line B, and the hemlocking parts 10 and 12 continuous at one end of the hemlocking parts 10 and 12, Bar tacking part 1 connecting 12
4, and an annular portion 16 that is continuous at the other end of the overlocking portions 10, 12 and connecting the overlocking portions 10, 12 in a semicircular shape, an eyelet buttonhole is formed.

When forming such an eyelet buttonhole, first a first step is carried out, in which the No. 0 stitch in Figure 1 is formed and the following No. 1 stitch is formed with equal feed pitch. A plurality of overlocking portions 10 are formed until the rear end position of the overlocking portion 10 is detected by a position detection device (not shown). In other words, the stitches from No. 0 to No. 1 are straight stitches that have no stitch width, and approximately correspond to the length of the hemline portion 10 to be completed in the third step, which will be described later.

When the position detection device detects the position of the rear end of the overlocking portion 10, the No. 2 stitch in Figure 1 is formed on the extension line of the straight stitch, and the No. 3 stitch is formed on the extension line of the straight stitch. A stitch No. 4 is formed on a line that is perpendicular to the straight line and in front of the center line B. Then, a stitch No. 4 is formed on the center line B and on the outer circumference of the annular portion 16, and then a stitch No. 5 is formed on the outer circumference of the annular portion 16. A seam is formed on the inner circumference of the annular portion 16 beyond the center line B. Those No.2 to No.
The stitch No. 5 constitutes a second step in which at least one stitch is formed in the other region of the two regions on the left and right sides of the center line B, in which the annular portion 16 is located. There is.

Next, stitches No. 6 to No. 15 are formed to form a portion located in one region of the annular portion 16, and subsequently, stitches No. 16 to No. 22 are formed. This completes the overlocking portion 10. That way
The stitches No. 6 to No. 22 form the third step that forms the half of the annular portion 16 located in one region and the hemline portion 10 continuous thereto. Note that a large number of stitches No. 21 and No. 22 are repeatedly formed according to the corresponding stitch position data until the position of the front end of the overlocking part 10 is detected by the position detection device, A zigzag seam along the center line B is thereby formed.

When the position detecting device detects the front end position of the overlocking part 10, a fourth step is executed,
No. 23 and No. 1 stitches similar to No. 0 and No. 1 stitches in the first step are placed symmetrically with respect to the center line B.
24 stitches are formed until the rear end position is detected.

Next, a fifth step is performed to
No. 2 to No. 2 in the second step.
Seams No. 25 to No. 28 are formed at symmetrical positions to the seam No. 5, and the seam No. 28 has already been formed in one region before the remaining annular portion 16 described later is formed. It is formed at the portion where half of the annular portion 16 is located.

Then, the sixth step is executed, and the seams No. 29 to No. 45, which are similar to the half of the annular portion 16 and the overlocking portion 10 formed in the third step, are completed, and the center line B to the annular part 16
The remaining half of the annular portion 16 and the overhanging portion 12 are formed at symmetrical positions between the half of the annular portion 16 and the overhanging portion 10, and No. 46 to No. 54 are formed on the outer edges of the front ends of the overhanging portions 10 and 12. A seam is formed and a bartack area 14 spanning the two overlock areas 10, 12 is formed to complete the buttonhole. Note that stitches No. 52, 53, and 54 are stitches for tacking that are formed at the same positions as stitches No. 46, 48, and 50, which are stitches on one side of the bar-tacking portion 14.

As described above, according to the present embodiment, the straight stitches in the first and fourth steps, the lengths of which are determined by the detected position on the workpiece cloth by the position detection device, and the straight stitches in the third and sixth steps, Since the hem portions 10, 12 or the annular portion 16 of the step are formed in the same cloth feeding direction, left and right seams centered on the center line B are formed with the same feeding efficiency of the work cloth. . Therefore, the stitches (stitch density) in the left and right regions located symmetrically about the center line B are almost the same, and the left and right balance of the buttonhole is suitably maintained.

Furthermore, in the second step and the fourth step, each of the halves of the annular portion 16 located in two areas on the left and right with the center line B as a border has at least one half in the other area of the area in which it is located. Since the threads formed after the stitches are formed and which form the annular region 16 between the left and right regions cross over the center line B,
Annular region 1 formed by different steps
The left and right halves of 6 are mutually reinforced in the tensile direction. Therefore, even if the buttonhole is reduced by the tension of the sewing thread after sewing, no gap will be created between the connecting portions of the left and right halves of the annular portion 16.

That is, according to this embodiment, the balance between the stitch densities on the left and right sides bordering on the center line B is maintained, and there is no gap between the left and right halves of the annular portion 16, so that the buttonhole can be made very beautifully. It is formed.

The above-mentioned embodiment is merely one embodiment of the present invention, and the present invention can be modified in various ways without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing eyelet buttonhole sewing to which an example of the method of the present invention is applied. 10, 12: Overedge area, 14: Bar tacking area, 16: Annular area.

Claims (1)

[Claims] 1. 2 located in two areas on both the left and right sides, respectively.
A method for forming a buttonhole having two overlocking parts, a bar-tacking part connected to the double overlocking parts at one end, and an annular part connecting to the double overturning parts at the other end, the method comprising: one of the two regions; a first step of forming a stitch having no stitch width from the one end to the other end in the region; and a first step of forming a stitch having no stitch width from the one end to the other end, and at least one stitch in the other region of the two regions where the annular portion is located. a second step for forming a seam; a third step for forming a half of the annular portion and a hemline portion connected thereto in the one region; and a third step for forming a stitch width in the other region from the one end to the other end. a fifth step of forming at least one stitch in the one region where half of the already formed annular portion is located; a sixth step of forming the remaining half of the annular portion and a selvedge portion connected thereto in the other region; and a seventh step of forming a bar-tacking portion spanning the two selvedge portions at the one end. Including buttonhole forming method.