Method for sewing machine to prevent miss-sewing

Abstract

The method for sewing machine to prevent miss-sewing is to limit the distance for the string hooking grip to move the hooked string in the place corresponding to the first needle, so that the string hooking grip hooks only the string penetrating the first needle reliably. The method can prevent miss sewing reliably.

Description

(1) Technical field [0001] The invention relates to a method for the upper thread of a sewing machine without missing thread at the beginning of sewing, in particular to a method for preventing the upper thread from leaking when sewing in the three-needle and five-thread mode. , so as to avoid the phenomenon of empty needle sewing on the upper needle. (2) Background technology [0002] The sewing pattern shown in Figure 1 is mainly to form three parallel sewing lines on the cloth surface, and the upper and lower sides of the cloth surface have upper and lower netting threads respectively to form a netting effect with the three sewing lines , This is the so-called chain stitching method in the industry. The sewing method is formed by using three needles to cooperate with the upper and lower mesh threads to perform three-needle and five-thread sewing operations. [0003] In addition, in the early stage of the sewing operation with three needles and five threads, in order to a...

AI Technical Summary

Problems solved by technology

There are roughly two reasons for this. One: because the suture is twisted together by several very fine yarns, the diameter of the suture will change in thickness due to the tightness of the twist or other reasons. When the diameters of the three sutures are different from each other, the thinner suture cannot be clamped by the hook clamping group, if the suture passes through the first needle and is used to press the upper When the thread is sutured, the suture will break away from the hook thread clamping group when the needle is sewn by the needle, and lose the clamping force and can no longer press the upper thread (as shown in Figure 5), resulting in sewing The phenomenon of thread leakage on the upper line sometimes occurs; second: because the hook thread clamping group must clamp three bur sutures at the same time, and in the process of clamping, two of the bur sutures may overlap, forming a hook. The thread clamping group is stretched by the overlapping two sutures, so that the other suture cannot be clamped by the hook thread clamping group, if the suture is passed through the first needle and used to suppress the upper thread When suturing, there will be a phenomenon that the suture will break away from the hook thread clamping group and lose the clamping force and can no longer press the upper thread when the needle is lowered to sew, resulting in the phenomenon that the upper thread leaks during sewing

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