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failure is due to suture a little spin to choose the wrong, the main friction accident is caused by many reasons too large due. most sewing machine surface line (bottom line without any sewing machine spin around the points) using the L line. only a small number of aircraft, such as the left straight needles and arch-lock needle sewing machine (imitation hand sewing machine ) must use the D-line to do so on the thread before use, this is because these devices in operation destroyed the L line twist. For example, double needle machine at this time on the left side of the hook can easily be destroyed from the twist seam strand with shares between penetration and cause a break in the third form. if the

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