二重環縫いミシンを用いた縫製時の糸張力と糸送り挙動

概要

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Using the 2 chain stitch sewing machine, the dynamic tensions of needle and looper threads, the amount of their threads which were fed, and the range of arm shaft turning angle when their threads were being fed, were simultaneously measured during sewing operation. The three peaks in needle thread tension curve and the two peaks in looper thread tension curve were observed, but the needle thread was fed twice and the looper thread was fed only once during a cycle of the sewing operation. As the tensions pulling out the needle thread increased, the range of arm shaft turning angle when needle thread was being fed the second time, decreased, a smaller amount of needle threads was fed and the each peak values of needle thread tension became large. Also as the tensions pulling out the looper thread increased, the same result was obtained on looper threads. However a smaller amount of needle threads was not fed the first time. As the tensions pulling out the needle thread varied, the relation between the feed length of each thread and peak tension of needle thread was shown by the regression equations.