Driving mechanism for thread trimming and lifting presser foot in overedger

Abstract

The invention provides a driving mechanism for thread trimming and presser foot lifting in an overedger, and belongs to the technical field of sewing machines. The driving mechanism comprises a motor, a driving wheel fixed on an output shaft of the motor, a first transmission mechanism linked with a trimming shaft and a second transmission mechanism linked with a presser foot shaft; the driving wheel is provided with a first driving face capable of driving the first transmission mechanism to act, a second driving face capable of driving the second transmission mechanism to act and an idle stroke face concentric with an output shaft of the motor, and the first driving face, the second driving face and the idle stroke face are all arranged on the edge of the driving wheel; the first driving face and the second driving face are both convex curved faces and are connected to the two sides of the idle stroke face respectively; when the first transmission mechanism is in the position in contact with the first driving face, the second transmission mechanism is in the position in contact with the idle stroke face; and when the first transmission mechanism is in contact with the idle stroke surface, the second transmission mechanism is in contact with the second driving surface. The driving mechanism has the advantages of high matching precision, high overall assembly efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, and relates to overlock sewing machines, in particular to a driving mechanism for thread trimming and presser foot lifting in the overlock sewing machine. Background technique [0002] Overlock sewing machine is also called side car, edge machine and bone car. It is generally divided into three threads, four threads or five threads. Its main function is generally to prevent the seam of the garment from fluffing. The overlock sewing machine has a presser foot mechanism and a thread trimmer mechanism. The presser foot mechanism includes a rotatable presser foot shaft and a presser foot assembly connected to one end of the presser foot shaft. When the presser foot shaft rotates, the presser foot assembly can be lifted; The thread mechanism includes a rotatable thread-cutting shaft and a cutter fixedly connected to one end of the thread-cutting shaft. When the thread-cutting shaft rotates, th...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and propose a driving mechanism for thread trimming and presser foot lifting in an overlock sewing machine, which solves the problem of low assembly efficiency of the whole machine due to difficulty in ensuring matching accuracy

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