JPH0353000B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a seam with improved overlocking strength against tearing of eyelet holes and eyelet portions of buttonholes by lockstitch sewing machines.

(Prior Art) An example of sewing an eyelet buttonhole using a lockstitch sewing machine is shown in FIG. As shown in the figure, a seam 2 is formed around the eyelet hole 1 where the button is located when in use, and although it has an anti-fray effect, it does not have much of a reinforcing effect and is used as a thread to hold the button in place when in use. There is a problem in that the eyelet hole part 1 tends to tear when subjected to force through the eyelet.

Fig. 2 shows an example of eyelet stitching using a lockstitch sewing machine. The seam 4 around the eyelet hole 3 is similar to the seam 2 near the eyelet hole 1 in FIG. 1, and has the same problem of being easily torn due to its strength as described above.

(Objective) An object of the present invention is to provide an overlock stitch with improved overlock strength against tearing of the eyelet hole and the eyelet hole portion of a buttonhole using a lockstitch sewing machine.

(Example) The present invention will be explained below with reference to an example. In Figure 3, the eyelet buttonhole stitching is cut line 5.
It is composed of a bar tack stitch 6, a right line tack 7, an overlock stitch 9 around the eyelet hole 8, and a left line tack 10 at the end 5' of the holder.

As shown in Fig. 4, the procedure for needle drop of overlock stitch 9 is a, b, c, d, e, f, g. A raphe group U, which is a roughly shaped unit consisting of d, and needle drops d, e,
The next unit raphe group U' consisting of f and g is sewn consecutively, and the single raphe group U' to be sewn next to the ▽ shape part of the unit raphe group U sewn earlier is ▽ This is a seam formed by partially overlapping the shapes.

To explain in detail, the unit raphe group is composed of the first, second, and third raphes shown below, and the first raphe A is approximately the width of the stitching with respect to the radius of the eyelet portion 8. Sewing point a on concentric circle V with large radius and eyelet hole 8
The second raphe line B is a raphe line that connects the nearby sewing point b and is inclined by a small angle α with respect to the line segment that connects the sewing point a and the center O of the radius of the eyelet hole portion 8. Sewing point b near hole 8 and another new sewing point c near eyelet hole 8
The third raphe line C is a raphe line that connects the first raphe line A and forms an acute angle with respect to the first raphe line A. It is a raphe line that connects the sewing point d, forms an acute angle with the second raphe line B, and intersects the first raphe line A, and the unit raphe group U is as described above. It is roughly shaped like this.

In the overlock stitch 9, the raphe group U of the unit is sewn continuously, and the second raphe B, which is the horizontal part of the shape part, is located on the eyelet hole 8 side, and The ▽-shaped part of the unit raphe group U' to be sewn next is partially overlapped with the ▽-shaped part of the raphe group U.

The needle drop of the overlock stitch 9 is performed by the sewing machine's cloth feed control and needle amplitude control.

According to the overlock stitch 9 according to the embodiment of the present invention,
If the button is on the side of the eyelet hole 8, the overlock seam 9 overlaps the raphe line near the eyelet hole 8 as described above, so it has sufficient strength against tearing. There is.

In addition, when the button comes near the end 5' of the cut line 5, the bar touch stitch 6 is placed close to the end.
Needless to say, it has sufficient strength against tearing.

In FIG. 5, the eyelet stitch 11 is the same stitch as the eyelet buttonhole stitch 9, and the raphes near the eyelet hole 12 are sewn overlappingly, so it is sufficient to prevent tearing. It has great strength.

(Effects) As described above, according to the present invention, it is possible to provide an overlock stitch with improved overlock strength against tearing of the eyelet hole and the eyelet hole portion of a buttonhole by a lockstitch sewing machine.

[Brief explanation of drawings]

Figures 1 and 2 are related to the conventional example, Figure 1 is a diagram showing the main parts of eyelet buttonhole stitching, Figure 2 is a diagram showing eyelet buttonhole stitching, and Figures 3 to 5 are according to the present invention. 3 is a diagram showing eyelet buttonhole stitching, FIG. 4 is a diagram showing details of the main part of FIG. 3, and FIG. 5 is a diagram showing eyelet buttonhole stitching. 8 and 12 are eyelet holes, 9 and 11 are overlock seams,
U and U' are unit raphe groups.

Claims (1)

[Claims] 1. When sewing eyelet holes and the eyelet part of buttonholes using a lockstitch sewing machine, the raphe group of units that are roughly shaped and the horizontal part is located on the eyelet side are continuous and the unit that was sewn first An eyelet hole and an eyelet hole part of a buttonhole in a lockstitch sewing machine characterized in that the shape part of the raphe group of the next unit to be sewn partially overlaps with the shape part of the raphe group of Overlock seam.