Thread trimming system of sewing machine and sewing method

Abstract

The invention discloses a thread trimming system of a sewing machine and a sewing method. The thread trimming system of the sewing machine comprises a thread trimming assembly, a thread trimming powerdriving device and a thread trimming ending movable knife, wherein the thread trimming assembly comprises a stationary knife and a movable knife rotationally connected to the stationary knife; the thread trimming power driving device is connected to the movable knife and is used for driving the movable knife to move, so that the movable knife and the stationary knife are matched for trimming andclamping threads; and the thread trimming ending movable knife is rotationally connected to the sewing machine shell, and the thread trimming assembly is connected to the thread trimming ending movable knife through a transmission mechanism, so that when the thread trimming ending movable knife rotates towards the preset thread trimming position, the transmission mechanism drives the thread trimming assembly to be away from the preset thread trimming position. Based on the arrangement of the thread trimming assembly, the thread end of the upper thread left on the bottom surface of the cloth can be shortened in the sewing process, and the bird nest phenomenon caused by winding of the thread end into stitches can be effectively avoided. The thread trimming assembly is of a shearing and clamping integrated structure, and the problem of seam starting and thread disengaging can be prevented. The thread trimming assembly and the thread trimming ending assembly are linked to avoid, so that the thread trimming assembly can be completely prevented from being touched when thread trimming of the thread trimming ending movable knife is completed in a mechanical mode.

Description

technical field [0001] The invention relates to the field of sewing technology, in particular to a sewing machine thread trimming system and a sewing method. Background technique [0002] At present, in the pattern machine, there is generally a certain length of upper thread thread left on the starting part of the back of the sewn fabric, which may be involved in the bottom thread stitches, forming a "bird's nest"-shaped thread ball. The existence of the "bird's nest" phenomenon will affect the aesthetics of the bottom line stitches of the sewn fabrics, and manual processing of the "bird's nest" is time-consuming and economically expensive. [0003] Therefore, how to reduce the occurrence of bird's nest is a technical problem that those skilled in the art need to solve at present. Contents of the invention [0004] In view of this, the object of the present invention is to provide a sewing machine thread trimming system, which can reduce the occurrence of bird's nests. A...

AI Technical Summary

Problems solved by technology

The existence of the "bird's nest" phenomenon will affect the aesthetics of the bottom line stitches of

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