Stitch length and differential regulating mechanism and sewing machine

Abstract

The invention provides a stitch length and differential regulating mechanism and a sewing machine. The mechanism comprises a stitch length regulating part, a differential ratio regulating part and a differential cloth feeding crank, wherein the stitch length regulating part comprises a first manual regulating component, a first hinge point and a second hinge point; the first manual regulating component is connected with the first hinge point, so as to position the first hinge point; the first hinge point is linked with the second hinge point; the second hinge point is in transmission connection with the main shaft of the sewing machine; the differential ratio regulating part comprises a second manual regulating component and a third hinge point; the second manual regulating component is connected with the third hinge point, so as to position the third hinge point; the third hinge point is in transmission connection with a differential cloth feeding component; the differential cloth feeding crank comprises a first connecting arm and a second connecting arm which are crosswise arranged; a crosswise fixed position between the first connecting arm and the second connecting arm is fixedly connected with a cloth feeding shaft; the cloth feeding shaft is in transmission connection with an active cloth feeding tooth component; the first connecting arm is in transmission connection with the second hinge point; the second connecting point is in transmission connection with the third hinge point. The stitch length and differential regulating mechanism and the sewing machine are simple and compact in structure and high in regulation precision.

Description

technical field [0001] The invention relates to the technical field of sewing machines, in particular to a stitch distance and differential adjustment mechanism and the sewing machine. Background technique [0002] With the rapid development of the garment industry, overlock sewing machines are widely used in garment manufacturing factories, and are very popular because of their good hemming effect and high work efficiency. Overlock sewing machines include low-speed overlock sewing machines, medium-speed overlock sewing machines and high-speed overlock sewing machines. Among them, the speed of high-speed overlock sewing machines can reach 8000 revolutions per minute. In the traditional industrial high-speed overlock sewing machine, the important part of the cloth feeding assembly contains many parts with a relatively complex structure, and the processing cost is high, and the stitch length adjustment method corresponding to this structure is cumbersome. Shaft, so that it is...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a needle pitch and differential adjustment mechanism and a sewing machine, which are used to solve the problem of convenient and accurate adjustment of the stitch pitch and differential ratio in the prior art

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