Needle bar assembly structure of sewing machine and control method thereof

Abstract

The invention provides a needle bar assembly structure of a sewing machine, belongs to the technical field of sewing equipment, and solves the technical problem that the conventional sewing equipment has a complicated structure in order to keep a thread trace perfect during reverse sewing. The sewing machine comprises an enclosure; the needle bar assembly structure comprises a needle bar and a driving piece; the needle bar is connected to the enclosure in a circumferential rotating and axial sliding manner; the driving piece is fixedly connected with the enclosure, and can drive the needle bar to continuously do reciprocating rotation; the needle bar assembly structure further comprises a control mechanism for controlling the driving piece to drive the needle bar to rotate for an angle. The invention further provides a control method for reverse sewing by using the needle bar assembly structure. According to the needle bar assembly structure of the sewing machine, the penetrating direction and the angle of a thread are adjusted in time by controlling the needle bar and a needle on the needle bar to do reciprocating rotation a certain angle, so that compact, tidy and uniform surface and bottom threads are guaranteed, the phenomenon of an imperfect thread trace during reverse sewing is eliminated, and a simple and practical structure is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of sewing equipment, and relates to a structure of a needle bar assembly of a sewing machine and a control method thereof. 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. When the sewing machine uses two sewing threads for sewing, the bottom thread is set on the hook under the needle bar of the sewing machine, and the upper thread is passed through the needle hole at the lower end of the needle bar, and the needle bar drives the sewing needle and the upper thread to move downward. Pass through the product to be sewn between the needle bar and the hook, and then the needle and the hook cooperate to make...

AI Technical Summary

Problems solved by technology

[0004] In the above patent, by synchronously rotating the needle bar of the sewing machine and the rotary hook, the sewing machine can sew the same perfect stitches as the forward sewing when the sewing machine is sewing in reverse. The needle bar and the hook rotate, the structure is complex, occupy a large space inside the sewing machine casing, and it is difficult to efficiently and accurately ensure the synchronous rotation of the needle bar and the hook

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