Simple sewing machine stitch length adjustment mechanism for and sewing machine

Abstract

The invention provides a simple sewing machine stitch length adjustment mechanism and a sewing machine. The mechanism comprises a principal shaft, a guide holder, a stitch length eccentric wheel, an eccentric sleeve, a guide pin fixed inside the eccentric sleeve, and a cloth delivering connecting rod, wherein an end surface of the guide holder is provided with a guide-track groove, and one end of the guide pin is positioned inside the guide-track groove; a hinge joint centre O1 of the principal shaft and the stitch length eccentric wheel, a hinge joint centre O2 of the stitch length eccentric wheel and the eccentric sleeve, and a hinge joint centre O3 of the eccentric sleeve and the cloth delivering connecting rod, are all arranged in an eccentric mode; when stitch length is adjusted, the principal shaft rotates relatively to the stitch length eccentric wheel, and meanwhile, the guide pin slides in the extension direction of the guide-track groove, and the eccentricity between the O3, the hinge joint centre of the eccentric sleeve and the cloth delivering connecting rod, and the O1, the hinge joint centre of the principal shaft and the stitch length eccentric wheel, is changed. Therefore, by using the simple sewing machine stitch length adjustment mechanism, the stitch length adjustment principle is changed from an original structure with four connecting rods to a simple structure with crank blocks, therefore the quantity of critical parts for realizing stitch length adjustment is decreased, in particular the quantity of irregular parts, and the processing difficulty and processing costs are all reduced.

Description

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

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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