A simple stitch length adjustment mechanism of a sewing machine and the sewing machine

Abstract

The invention provides a simple sewing machine stitch length adjusting mechanism. The simple sewing machine stitch length adjusting mechanism comprises a main shaft, a driving wheel fixed to the main shaft, a cloth conveying connecting rod, a stitch length forming eccentric wheel and a swing block located between the driving wheel and the stitch length forming eccentric wheel; the driving wheel, the swing block and the stitch length forming eccentric wheel are connected in an abutting-against mode; a stitch length forming connecting part in the swing block is arranged on the stitch length forming eccentric wheel, is rotationally connected to the periphery of the main shaft and is matched with the swing block; the cloth conveying connecting rod is rotationally installed on the periphery of the swing block; the stitch length forming eccentric wheel and the hinge center O1 are arranged in an eccentric mode, the stitch length forming eccentric wheel and the matching center O2 of the swing block are arranged in an eccentric mode, and the swing block and the hinge center O3 of the cloth conveying connecting rod are arranged in an eccentric mode. The stitch length adjusting principle is changed into the simple crank-rocker structure from the original four-connecting-rod structure, the number of key parts for stitch length adjusting is reduced, and the shapes of the parts are regular, so that machining difficulty and cost are reduced.

Description

technical field [0001] The invention relates to a garment sewing equipment, in particular to a simple stitch length adjusting mechanism of a sewing machine and a sewing machine. Background technique [0002] At present, all sewing machines are equipped with stitch length adjusting mechanisms, which are used to adjust the size of the stitch length to meet different sewing requirements. The existing sewing machine needle distance adjustment mechanism such as figure 1 and figure 2 As shown, it mainly includes the main shaft 100, the hand wheel 200, the feeding eccentric 300, the small eccentric 400, the eccentric 500, the feeding connecting rod 600, the bearing 700, the eccentric wheel 800, and the torsion shaft. 900, the slider 110, the ratchet 120, the spring 130, the torsion spring 140, etc., wherein the handwheel 200 is fixed on the end of the main shaft 100, the feeding eccentric 300 is fixed on the main shaft 100, and the inner hole of the small eccentric 400 is fixed ...

AI Technical Summary

Problems solved by technology

[0004] Although the needle pitch adjustment mechanism of the above sewing machine has realized the adjustable stitch pitch, its structure is complicated, the number of parts is large, and the main parts (feeding eccentric wheel 300, small eccentric wheel 400, eccentric wheel 500 and Stitch eccentric wheels (800) are special-shaped parts with high precision requirements and complex structures, which lead to difficult processing of the stitch gauge adjustment mechanism and high processing costs, thereby increasing the overall cost of the sewing machine

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