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Fraying prevention method for double chain stitch seams and fraying prevention device for double chain stitch sewing machine
Fraying prevention method for double chain stitch seams and fraying prevention device for double chain stitch sewing machine
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机译:防止双链式线迹接缝的起花方法和防止双链式线迹缝纫机的防磨损装置
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摘要
A method for preventing seam ravel of multi-thread chain stitches is provided. After normal sewing is terminated with a looper set in a forward movement state, a state in which a needle thread loop caught by the looper is subjected to position-holding at a position closer to a forward movement end of the looper than a descent position of a needle is maintained until the needle descends through the needle thread loop caught by the looper. Thereafter, the position-holding of the needle thread loop is released to permit a sewing action for at least one stitch, thereby allowing the needle thread loop to be self-looped with a needle thread held by the needle. This surely strongly prevents the seam ravel of multi-thread chain stitches formed by the single needle, irrespective of the dimension of tension applied to the needle thread and the looper thread.
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