Built-in automatic thread trimming mechanism of sewing machine

Abstract

The invention provides a built-in automatic thread trimming mechanism of a sewing machine. The built-in automatic thread trimming mechanism comprises a driving source and a sewing machine main shell. A sunken portion is arranged on the rear wall of the sewing machine main shell, and the driving source is arranged in the sunken portion; a telescopic shaft of the driving source is movably connected with a first lever, one end of the first lever is hinged to the sewing machine main shell, and the other end of the first lever is hinged to one end of a second connecting rod; the other end of the second connecting rod is hinged to one end of a second lever, and the other end of the second lever is perpendicularly fixed to a cutter shaft; the cutter shaft is rotatably supported in a cutter head, and the cutter head is fixed to the side, which is adjacent to a needle, of the sewing machine main shell; a movable cutter which is perpendicular to the cutter shaft is fixed to an end of the cutter shaft, is close to the front side wall of the sewing machine main shell and is opposite to a fixed cutter of the cutter head; a rear housing is fixed to the outer side of the sunken portion on the rear wall of the sewing machine main shell. The built-in automatic thread trimming mechanism has the advantages that various actuators of the built-in automatic thread trimming mechanism are mainly hinged to one another, accordingly, stable transmission effects can be realized, the built-in automatic thread trimming mechanism is low in noise, the driving source is short in stroke and small in size, the thread trimming mechanism can be arranged in the sewing machine main shell, and the integral sewing machine is attractive.

Description

technical field [0001] The invention relates to the technical field of sewing equipment, in particular to a built-in automatic thread trimming mechanism of a sewing machine. Background technique [0002] With the rapid development of science and technology, the degree of mechanization of clothing manufacturing is getting higher and higher. In the field of clothing manufacturing technology, there are many sewing equipment mainly based on sewing machines, such as lockstitch sewing machines, overlock sewing machines, interlock sewing machines, etc. [0003] Overlock sewing machine is also called side car and edge machine. Its main function is to prevent the seam of the garment from fluffing. The stitches of the overlock sewing machine are mesh-shaped. T-shirts, sportswear, underwear, knitting and other fabrics, widely used, is the necessary sewing equipment for large garment factories. [0004] The automatic trimming mechanism of the overlock sewing machine in the prior art is...

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Problems solved by technology

[0004] The automatic thread trimming mechanism of the prior art overlock sewing machine is a sliding type, and the electromagnet as the driving source is connected to the slider pin, and the slider pin is connected to the connecting crank of the tool holder. During the movement of the electromagnet, the noise is very large. Moreover, the stroke of the electromagnet is also very large, resulting in a large volume of the electromagnet and a large installation space requirement for the automatic thread trimming mechanism of the overlock sewing machine, resulting in a large volume of the overlock sewing machine, which makes the appearance of the overlock sewing machine not beautiful enough, and the electromagnet The shell needs to adopt electroplating process, so the manufacturing cost of the electromagnet is high, which makes the configuration cost of the automatic thread trimming mechanism of the overlock sewing machine high, and finally leads to high production cost of the overlock sewing machine

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