Stitch structure of double overlock seam

Abstract

PROBLEM TO BE SOLVED: To provide a new seam fray stopping method, effectively preventing the occurrence of fray peculiar to a seam of a multi-thread chain stitch, and hardly influenced by applied tension of a needle thread, and provide a seam fray stopping device used in implementing the seam fray stopping method.SOLUTION: A thread guard hook 3 disposed at the back of needle locations A, A is arranged, the thread guard hook 3 is rocked to make a hook part 3b at the tip approach to the back of a looper 1, and among a plurality of thread needle loops captured by the looper 1 at the leading end, a needle thread loop located at the leading side is held. In this state, sewing operation for at least one stitch is performed to pass a descending needle through the held needle thread loop, and the needle thread loop is looped with its own thread by the needle thread held by the needle. The looper thread is pressed by the own thread looping part to prevent slipping-off of the looper thread.

Description

technical field [0001] The present invention relates to a thread fray prevention method for preventing fraying that occurs at a seam at the end of sewing in stitches of double lockstitch formed by a needle thread and a looper thread using a sewing machine such as a double thread lockstitch sewing machine and a lockstitch sewing machine, and A fray preventing device for carrying out the method. Background technique [0002] The double-thread overlock sewing machine includes: a plurality of needles that keep the needle thread rising and falling, and a looper that keeps the looper thread advancing and retreating in the direction of the arrangement of the needles. A plurality of needles penetrate the sewing material on the needle board, descend, pull out the sewing material, and rise. The looper advances and retreats under the needle plate in conjunction with the raising and lowering of the needles, and catches the needle thread loop (needle thread loop) held by the rising need...

AI Technical Summary

Problems solved by technology

[0008] For example, in the sewing of thin sewing materials and soft sewing materials, in order to obtain a good finished state, the tension applied to the needle threads 6, 6 and the looper threads 7 is reduced, because the needle thread loops 6a, 6b are Insufficient fastening of the looper thread 7 causes the above-mentioned problems

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