JPH0245911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a buttonhole sewing method in which both left and right sides are sewn in the same direction.

[Prior Art] Conventionally, buttonhole sewing has been carried out according to the procedure shown in FIG.

(b) First, perform a straight stitch with normal feed on the first side, that is, the left side. (Figure 3a) (b) Next, perform a zigzag stitch in reverse. (3rd
Diagram b) (c) Perform normal feed straight stitch on the right side sewing section.
(Figure 3c) (d) Apply bartack stitches between the left and right side seams. (Fig. 3 d) (e) After bar tacking, reverse zigzag stitch on the right side seam (Fig. 3 e) (f) Complete the sewing by applying bar tacking between the left and right seams (Fig. 3 e) Figure 3 f).

A similar procedure is also used when sewing in using the core thread. That is, a method is used in which the core thread is placed upside down at the buttonhole position, and both sides are sewn in using zigzag stitches in the above-described procedure.

[Problems to be Solved by the Invention] However, when the core thread is sewn in using the conventional method described above, the end of the core thread is shaken during the first bar tacking, causing misalignment, and subsequent In zigzag sewing, the core thread is not sewn in, resulting in a problem of so-called core thread coming off.

[Means for Solving the Problems] The present invention provides that, after the sewing of the core thread on one side of the core thread placed across both sides of the sewn portion is completed, the sewing of the core thread on the other side where the sewing has not been completed is performed. This method attempts to solve the above-mentioned conventional problems by performing the subsequent sewing work after fixing the core thread to the workpiece by performing basting on the core thread.

[Function] In this invention, after the part of the core thread that has not yet been sewn is basted, the subsequent sewing work such as bar tacking is performed, so the core thread can be sewn properly without misalignment. Can be done.

[Example] An example according to the present invention will be described based on the drawings.

1 and 2 are diagrams showing one embodiment of the present invention. FIG. 1 is a diagram showing the main steps of the sewing method according to the present invention, and FIG. 2 is a flowchart of the entire process.

First, the core yarn A is placed upside down at a predetermined location. Then, a straight stitch (normal feed) is made along the core thread A from the side of the left corner of the core thread A. (Step 1) Next, sew the core thread A on the left side using reverse zigzag stitching. (Step 2) Then, at point A on the upper right end of the core thread A, drop the needle to two points A1 and A2 to fix the upper end of the core thread A to the workpiece (Steps 3 and 4). Make a straight stitch along the forward feed. (Step 5) Make a needle drop at two points Ro 1 and Ro 2 at the lower end point Ro of the core yarn A to fix the end of the core yarn A to the workpiece.
(Steps 6 and 7) Next, after making the bar tack stitches on the lower side, sew in the core thread A using reverse zigzag stitches. (Step 8,
9) Since the core thread A is fixed to the workpiece during the above steps 3, 4, 6, and 7, it will not be swayed and misaligned during bar tacking and zigzag stitching, and will remain in the specified position. It can be sewn with.

Then, the upper bartack is sewn and the entire process is completed (Step 10) [Effects of the Invention] With the structure and operation described above, this invention can produce high-quality buttonholes without causing misalignment of the core thread. can be obtained efficiently.

[Brief explanation of drawings]

Figures 1a and b are explanatory diagrams of main parts of an embodiment according to the present invention, Figure 2 is a process flow diagram of the same embodiment, and Figure 3
Figures a to f are process diagrams of a conventional example.

Claims (1)

[Claims] 1. In a buttonhole sewing method in which a substantially U-shaped core thread is sewn in while the fabric is fed in the same direction on both sides of the buttonhole, after forming the first side stitch by zigzag stitching from one end of the core thread, Form at least two stitches that sandwich the bent part and the other end of the core thread located at the position where the second side seam is to be sewn, and then bar-tack the end of the core thread using zigzag stitches. A buttonhole sewing method using a sewing machine, characterized in that a second side seam is formed in the same direction as a first side seam.