Sewing machine with adjustable needle bar stroke

Abstract

The invention discloses a sewing machine with an adjustable needle bar stroke, and belongs to the technical field of sewing machines. The sewing machine comprises a needle bar, a connection bar, a crank, a main shaft and a motor and further comprises an eccentric link pin. The upper end of the connection bar is connected with the crank through the eccentric link pin, the upper end of the connection bar is provided with an axial through hole, a first shaft is matched in the axial through hole in the connection bar in a rotating mode, the outer end of the first shaft is connected with an adjusting screw in a threaded mode in the axial direction and is cushioned with a limiting gasket for preventing the upper end of the connection bar from axial movement, and a left cover of a machine head at the position where the adjusting screw stretches outwards in the axial direction is provided with a screw hole for a screw driver to be inserted so as to screw the adjusting strew conveniently. The sewing machine with the adjustable needle bar stroke has the advantages of being adjustable in the needle bar stroke, simplifying the adjusting mode, saving oil and the like.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, and more specifically relates to a sewing machine with an adjustable needle bar stroke. 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. A general sewing machine consists of four parts: machine head, machine base, transmission and accessories. The machine head is the main part of the sewing machine. It is composed of four mechanisms: barbed material, thread hook, thread take-up, and feeding, and auxiliary mechanisms such as winding, pressing, and falling teeth. The material is sewn together. [0003] The needle bar travel mechanism on the existing sewing machine includes the needle...

AI Technical Summary

Problems solved by technology

[0004] The needle bar travel is the displacement between the pointer bar rising to the highest point and falling to the lowest point in the vertical direction. From the above mechanism, it can be seen that the needle bar rises to the highest point in the vertical direction and falls to the lowest point. The two points cannot be changed, that is to say, the stroke of the needle bar is fixed and cannot be adjusted

In the actual use of the sewing machine, the thickness of the sewing fabric is different, and the needle bar stroke of the sewing machine is closely related to the thickness of the sewing fabric, so the existing sewing machines limit the machine to a certain extent. scope of application

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