Needle bar crank

Abstract

The invention discloses a needle bar crank, which comprises an upper shaft, a second bearing, a needle bar and a casing pipe, wherein the upper shaft is of a cylindrical structure which is horizontally arranged; a left side end on the upper shaft is rotatably connected with a first bearing; the right side end of the upper shaft is rotatably connected with the second bearing; the second bearing iswelded with the crank of an S-shaped structure; the middle of the outer left side of the casing pipe is welded and fixed; the top and the bottom of the outer side of the casing pipe are respectively provided with a first copper bush and a second copper bush; the needle bar is arranged in the casing pipe; the bottom end of the needle bar is welded with a needle guard; the left side of the casing pipe is provided with a chute; a sliding block is arranged in the chute. According to the needle bar crank, the puncture force of the needle bar is improved, and the thick stuff adaptation of a sewing machine is improved.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, and in particular relates to a needle bar crank. 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. And it derived art forms such as hand-push embroidery and computer embroidery. In the early days, they were basically single-needle, hand-cranked sewing machines. Later, electric-driven sewing machines were invented and became the mainstream in the market. Divided according to its mechanism and stitch form, it can be roughly summarized as JA type, JB type, JG type, and JH type. The picture below is a kind of household sewing machine - JG household electronic multifunctional sewing mach...

AI Technical Summary

Problems solved by technology

[0003] The puncture force brought by the needle bar crank on the current sewing machine is not strong enough

Only a single needle is used for sewing, and the efficiency is low

Images