Sewing machine reverse sewing buffer gear

Abstract

The invention belongs to the technical field of sewing machines, and particularly relates to a sewing machine reverse sewing buffer gear. The buffer gear comprises a needle distance adjusting mechanism and a reverse sewing electromagnet, wherein the reverse sewing electromagnet is arranged on one side of a feeding adjusting shaft of the needle distance adjusting mechanism and comprises a shell part and a frame which is arranged outside the shell part. A coil is arranged in the shell part. An iron core penetrates through the shell part, and the head and the tail of the iron core respectively stretch out of the frame. The head of the iron core is connected with the feeding adjusting shaft. A buffer device for buffering the movement of the iron core is arranged on one side of the frame and connected with the feeding adjusting shaft. The movement of the buffer device is driven by the iron core. By the arrangement of two buffer springs, impact force, noise and abrasion of parts are reduced, and the service life of the electromagnet is prolonged. The parts are general parts and can be matched with various electromagnets for use. The buffer gear is simple in structure, low in cost and suitable for the sewing machine.

Description

Technical field: [0001] The invention belongs to the technical field of sewing machines, in particular to a buffer mechanism for reverse sewing of a sewing machine. Background technique: [0002] When the sewing machine is sewing forward and reverse, the electromagnet telescopically drives the feed adjustment shaft to rotate, and the feed adjuster is driven to swing through the adjustment crank and the feed swing rod, and the feed adjuster stud limits the stitch distance of the feed adjuster. The structure of the electromagnet is: including a shell and a frame arranged outside the shell, a coil is arranged inside the shell, an iron core is arranged inside the shell and the head and tail protrude out of the frame respectively; there are electromagnets with this structure The following defects: When the electromagnet is stretched, the iron core circular table in the electromagnet collides with the inner wall of the electromagnet shell; when it shrinks, the nut will collide wit...

AI Technical Summary

Problems solved by technology

The structure of the electromagnet is: including a shell and a frame arranged outside the shell, a coil is arranged inside the shell, an iron core is arranged inside the shell and the head and tail protrude out of the frame respectively; there are electromagnets with this structure The following defects: When the electromagnet is stretched, the iron core circular table in the electromagnet collides with the inner wall of the electromagnet shell; when it shrinks, the nut will collide with the outer wall of the electromagnet shell; will collide with the feed regulator

The above-mentioned various impacts produce a lot of noise, and at the same time, long-term impacts will cause wear and tear, and the accuracy will decrease after the parts are worn.

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