Method and device for shortening flat sewing machine trimmed thread

Abstract

The invention belongs to the technical field of sewing machines and particularly relates to a method and a device for shortening a flat sewing machine trimmed thread that the needle pitch is adjusted close to zero when a thread is trimmed. The structure of the device is that an air cylinder is fixed on an air cylinder mounting plate, the outer end of an air cylinder piston rod and one end of a connecting rod are in hinge connection, the other end of the connecting rod and one side of a sliding plate are in hinge connection, the sliding plate is fixedly connected on a feeding swing plate seat, one end of a feeding-pouring connecting rod and a feeding regulator are in hinge connection, the other end of the feeding-pouring connecting rod and one side of the feeding swing plate seat are in hinge connection, the air cylinder piston rod drives the connecting rod in a retracting mode, the connecting rod pulls the sliding plate, the sliding plate is fixed on the feeding swing plate seat, the feeding regulator is driven through the feeding-pouring connecting rod, the needle pitch is adjusted between 0+1mm and 0-1mm, two thread ends remained after sewing is finished are nearly in the same needle hole and form a similar interlocking shape, neither one of the two thread ends is prone to falling off when any thread is pulled, and thus firmness and attractiveness are achieved.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, and in particular refers to a method and a device for shortening the thread trimming of a locket sewing machine for adjusting the stitch distance to be close to zero when thread trimming. Background technique [0002] At present, using a lockstitch sewing machine, the thread is automatically trimmed directly after sewing, and there are two thread ends at the thread trimming place of the material to be sewn, and the two thread ends are one long and one short, one in front and one behind, separated by one and sewing The stitch length is the same as before the end; for the material sewn in this way, the thread ends left after thread trimming are not firm, and will fall off when pulled lightly, which affects the sewing effect and lacks aesthetic feeling. Contents of the invention [0003] The object of the present invention is to provide a method and device for cutting and shortening the th...

AI Technical Summary

Problems solved by technology

[0002] At present, using a lockstitch sewing machine, the thread is automatically trimmed directly after sewing, and there are two thread ends at the thread trimming place of the material to be sewn, and the two thread ends are one long and one short, one in front and one behind, separated by one and sewing The same stitch distance before the end; the material sewn in this way, the thread ends left after thread trimming are not firm, and will fall off when pulled lightly, affecting the sewing effect and lacking aesthetic feeling

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