| 摘要 |
PROBLEM TO BE SOLVED: To prevent looseness and separation of fibers of a cloth around the buttonhole which must be sewn by forming a seam for reinforcing a buttonhole seam when the buttonhole seam is formed around a buttonhole by a cutting operation using a cloth-cutting knife. SOLUTION: This buttonhole sewing machine is provided with a seam forming means for forming a buttonhole seam consisting of a pair of side seams on the both sides of a cut buttonhole which is formed in a material to be sewn and bar-tacking seam at least formed at an end of the buttonhole such that the bar-tacking seam is continued from the two side seams, wherein, before forming the buttonhole seam, superposed seams formed by repeating the reinforcing seams consisting of zigzag seams or straight stitch each having a width narrower than that of each side seams are formed at positions of the bar-tacking seam which is continued from the side seams and the two side seams, are formed to prevent a needle from locating at a same point. COPYRIGHT: (C)2009,JPO&INPIT
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