Thread trimming mechanism of sewing machine

Abstract

The invention discloses a thread trimming mechanism of a sewing machine. The thread trimming mechanism comprises a thread trimming driving shaft. The thread trimming driving shaft is fixedly connected with a thread trimming crank. The thread trimming crank is hinged to one end of a main moving cutter connecting rod. The other end of the main moving cutter connecting rod is hinged to a main moving cutter set. Main moving cutters are arranged on the main moving cutter set. The thread trimming driving shaft is connected with the middle section of an auxiliary moving cutter swinging rod, the other end of the auxiliary moving cutter swinging rod is fixedly connected with the thread trimming crank, the other end of the auxiliary moving cutter swinging rod is hinged to one end of an auxiliary moving cutter connecting rod, and the other end of the auxiliary moving cutter connecting rod is hinged to an auxiliary moving cutter set; auxiliary moving cutters are arranged on the auxiliary moving cutter set. The thread trimming driving shaft swings to drive linkage of a connecting rod mechanism, so that engagement of the main moving cutters and the auxiliary moving cutters, and the purpose of thread trimming is achieved.

Description

technical field [0001] The invention relates to an accessory of a sewing machine, in particular to a thread trimming mechanism of the sewing machine. Background technique [0002] The thread trimming mechanism of existing sewing machine generally all is made up of fixed knife, moving knife, connecting rod and drive shaft, and fixed knife is fixedly installed on the casing; Drive the moving knife holder to make the moving knife move towards the fixed knife to achieve the purpose of closing the thread trimmer. [0003] The stitches of the sewing machine are mainly formed by the movement of the needle and the hook. In order to prevent the suture from touching the edge of the knife in the sewing state, the moving knife and the fixed knife must avoid the range of motion of the moving parts, and the fixed knife is fixed on the needle. On one side, there is a certain distance between the fixed knife and the machine needle, which leads to a certain distance between the overlapping ...

AI Technical Summary

Problems solved by technology

[0003] The stitches of the sewing machine are mainly formed by the movement of the needle and the hook. In order to prevent the suture from touching the edge of the knife in the sewing state, the moving knife and the fixed knife must avoid the range of motion of the moving parts, and the fixed knife is fixed on the needle. On one side, there is a certain distance between the fixed knife and the machine needle, which leads to a certain distance between the overlapping and engaging position of the moving knife and the fixed knife and the machine needle, which in turn leads to excessive length of thread remaining on the sewn product after thread trimming and machine The length of the thread on the needle is not stable

However, if the thread ends on the sewn products are too long, manual trimming of the thread ends is required. The unstable length of the thread ends on the needle will lead to bad stitches in the next sewing, which will affect the sewing quality.

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