Needle bar stroke adjustment structure, sewing machine with the same and stroke adjustment method

Abstract

The invention discloses a needle bar stroke adjustment structure, a sewing machine with the same and a stroke adjustment method. The stroke adjustment structure includes a needle bar crank, a needle bar connecting rod, a needle bar pin, an eccentric wheel and a positioning part. The needle bar crank is rotatably installed on a casing of the sewing machine, one end of the needle bar connecting rodis rotatably connected with a needle bar of the sewing machine, and the other end of the needle bar connecting rod is rotatably installed on the needle bar crank and provided with a circular installation hole. The needle bar pin is inserted into the needle bar crank, and the side wall of the needle bar pin is provided with a taper pin hole. The eccentric wheel is installed in the installation holethrough sleeving, and the needle bar pin is arranged in an eccentric hole of the eccentric wheel. One end of the positioning part passes through the eccentric wheel in the radial direction and is inserted into the taper pin hole, and the other end of the positioning part is located within the outer edge of the eccentric wheel. A relevant device does not need to be pried out, on one hand, the damage to the device can be avoided, on the other hand, adjustment is easy, operation is facilitated, and the needle bar stroke adjustment efficiency is improved. Besides, eccentric pins are not used, theprocessing difficulty and cost of the parts are reduced and the thickness adaptability of the machine can be improved.

Description

technical field [0001] The invention relates to a needle bar stroke adjustment structure in the technical field of textiles, in particular to a sewing machine, and also to a needle bar stroke adjustment method. Background technique [0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing material. The sewing machine can sew fabrics such as cotton, fiber crops, silk, wool, and artificial fibers, and products such as leather, plastics, and paper. [0003] In the existing interlock sewing machines with regard to the stroke adjustment of the needle bar, the stroke adjustment methods are generally more complicated. Wherein, more typical patent is CN1303276C as publication number, and patent name is the patent of the device that changes sewing machine needle bar stroke. When adjusting the stroke of this sewing machine, first remove the left cover of the machin...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art, the present invention provides a needle bar stroke adjustment structure, a sewing machine and a stroke adjustment method thereof, which solve the problems of cumbersome adjustment process and difficult adjustment in the existing sewing machine needle bar stroke adjustment device

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