Thread ball preventing device for sewing machine

Abstract

The invention relates to a thread ball preventing device for a sewing machine. The thread ball preventing device comprises a presser foot bottom plate and a presser foot handle hinged to the presser foot bottom plate. The thread ball preventing device is characterized in that a hole is formed in the presser foot handle, an air suction pipe and a thread hook are arranged in the hole, and a thread hook connecting plate is connected to the tail portion of the thread hook in an inserted mode; the upper portion of the presser foot handle is hinged to one end of a connecting plate, and the thread hook connecting plate is hinged to the other end of the connecting plate; the presser foot handle is further fixedly connected with a cylinder body of a cylinder, and a piston rod of the cylinder is hinged to the middle of the connecting plate; a shallow groove is formed in the middle of the presser foot bottom plate, a circular cutter is inset into the shallow groove, a gap capable of allowing a sewing thread to penetrate into is formed between two presser feet of the presser foot bottom plate, and the circumferential edge part of the circular cutter covers part of the gap. Compared with the prior art, according to the thread ball preventing device for the sewing machine, the cutter is shaped like a circle, the extremely small acting force between a thread residue and the edge part of the cutter can enable the thread residue to be cut off, and the cutter can even be used all the time; in addition, a thread hooking device cannot deform, and large personal body and property losses are avoided.

Description

technical field [0001] The invention relates to a sewing machine, in particular to a bird's nest preventing device for a lockstitch sewing machine. Background technique [0002] "Bird's Nest" means that when the lockstitch sewing machine starts to sew, the upper thread stays on the presser foot surface to start sewing, and the bottom thread at the beginning appears a thread ball phenomenon. The computer tangent lockstitch sewing machine mainly uses a sewing thread to form a thread A machine that interweaves or stitches one or more layers of sewing material. It is usually divided into thin material and thick material. Computer tangent lockstitch sewing machine can sew hemp, silk wool, artificial fiber and other fabrics and leather, plastic, paper and other products. Thin material is generally used for knitted underwear, shirts, uniforms, etc. Thick materials are generally used in all kinds of sportswear, denim clothes, fashion, coats, shoes and hats, bags, etc. Computerized ...

AI Technical Summary

Problems solved by technology

[0005] The secant blades of the above two patents are both rectangular, and the action between the blade and the end of the thread is "cutting" rather than "cutting". In addition, the edge of this blade is a straight line, the range is 0-180°, after the edge becomes blunt, only a new blade can be replaced

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