Buttonhole serging machine and method for forming stitch thereof

Abstract

A button holing sewing machine has a pair of side seams along both sides of the button hole incised and formed at the fabric to be sewn and seam forming means which exist on at least one end side of the button hole and form the button hole same by a bar tack continuous with both side seams. The sewing machine described above forms high-density ''zigzag'' stitches narrower than the side seams in the positions where the side seams are formed.

Description

technical field [0001] The invention relates to a buttonhole seam sewing machine which forms buttonhole seam stitches around a buttonhole cut and formed on a sewn object. Background technique [0002] In the buttonhole overlock sewing machine called a cycle sewing machine, before or after the cloth cutting knife is dropped on the object to be sewn to form the buttonhole, side stitches formed on both sides along the buttonhole and the aforementioned side stitches connected to the side stitches are formed. A reinforcement stitch at one or both ends of a buttonhole, resulting in a buttonhole overlock stitch. [0003] In addition, when using a household sewing machine to form buttonhole overlock, straight line stitches are formed on the side stitch forming part along the buttonhole before the side stitches are formed, so that the buttonhole overlock stitches have a certain feel. [0004] And utilize electromagnetic coil or voice coil motor etc. as electr...

AI Technical Summary

Problems solved by technology

[0005] However, when such buttonhole seam stitches are formed on clothing materials made of thick fibers such as wool gabardine or clothing materials made of new materials such as shape memory materials that have recently appeared, due to the formation of these clothing fibers, The feature is that after cutting the fibers perpendicular to the buttonhole forming direction in the fabric cut by the cloth cutting knife, these fibers are easy to fall off and loosen from the buttonhole overlock stitches, resulting in a defect in the quality of the product

[0006] And even if the straight stitches are formed before forming the side stitches like a household sewing machine, since they do not have any reinforcing effect on the fibers perpendicular to the buttonhole, the same disadvantages as above will occur.

Images