Built-in automatic presser foot lifting mechanism of sewing machine

Abstract

The invention provides a built-in automatic presser foot lifting mechanism of a sewing machine. The built-in automatic presser foot lifting mechanism comprises a driving source, a first lever, a first transmission shaft, a draw bar, a second lever, a second transmission shaft, a presser foot arm, a presser foot, a sewing machine main shell, a rear housing and a side housing. The sewing machine main shell comprises a base shell and an upright column shell above the base shell; the driving source is arranged in a sunken portion on the rear wall of the base shell; the first transmission shaft and the second transmission shaft are horizontally arranged, are parallel to each other and are rotatably supported on the side walls of the upright column shell; a telescopic shaft of the driving source can drive the first transmission shaft via the first lever so that the first transmission shaft can rotate; a first lever arm of the first transmission shaft can drive the second lever via the draw bar so that the second transmission shaft which is fixed to the second lever can rotate, and the presser foot arm is perpendicularly hinged to the second transmission shaft and the presser foot; the rear housing is arranged on the outer side of the sunken portion, the side housing is arranged on the outer side of the second transmission shaft and the outer side of the second lever, and both the rear housing and the side housing are fixed to the sewing machine main shell. The built-in automatic presser foot lifting mechanism has the advantages of compact structure, attractive appearance of the sewing machine and convenience in packaging and transportation.

Description

technical field [0001] The invention relates to the technical field of sewing equipment, in particular to a built-in automatic presser foot lifting 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 presser foot lifting mechanism of the overlock sewing machine in the prior...

AI Technical Summary

Problems solved by technology

[0004] The presser foot lifting mechanism of the overlock sewing machine in the prior art includes a manual presser foot lifting mechanism and an automatic presser foot lifting mechanism. The automatic presser foot lifting mechanism of the overlock sewing machine in the prior art realizes the conversion of the driving force through two lever mechanisms. To reach the stroke of the presser foot, the direction of the driving force has to be changed by 90 degrees during the conversion process, resulting in a large amount of force loss, resulting in a large driving stroke and driving force of the electromagnet as the driving source, so the volume of the electromagnet is large. , The economic cost is high, and the overall structure is not compact, so that the presser foot lifting mechanism protrudes from the rear of the whole machine, which seriously affects the appearance of the overlock sewing machine, and is not conducive to packaging and transportation

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