A thread-cutting structure for a sewing machine

By adopting a movable pressure plate design and a return spring in the sewing machine's thread cutting structure, the wear problem caused by the fixed pressure plate is solved, achieving reliability and extended lifespan of the thread cutting structure, stable thread cutting effect, short residual thread ends, and improved sewing aesthetics.

CN119932824BActive Publication Date: 2026-07-17WUXI PINYI SEWING MASCH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUXI PINYI SEWING MASCH CO LTD
Filing Date
2025-01-23
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing sewing machine thread-cutting structures, the fixed installation of the pressure plate causes wear on the moving blade edge, resulting in insufficient reliability, short service life, and frequent thread-cutting failures.

Method used

The design employs a movable pressure plate connected to the moving blade, combined with a return spring, to prevent direct contact between the pressure plate and the moving blade edge. It also provides a buffer when the moving blade overshoots, and the auxiliary blade and pressure plate move slightly to avoid hard impacts, thus extending service life.

Benefits of technology

It improves the reliability of the thread-cutting structure, extends its service life, ensures a sharp cutting edge, maintains a stable thread-cutting effect, and leaves short thread ends, thus enhancing the aesthetics of the sewing.

✦ Generated by Eureka AI based on patent content.

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    Figure CN119932824B_ABST
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Abstract

This invention provides a thread-cutting structure for a sewing machine, belonging to the field of sewing machine technology. It solves the problems of insufficient reliability and short service life of existing thread-cutting structures. The thread-cutting structure of this sewing machine includes a pressure plate, an auxiliary knife mounted on the machine base, and a movable knife located below the needle plate and capable of swinging up and down around the shuttle shaft of the sewing machine. The auxiliary knife has a thread-cutting end with an auxiliary cutting edge. The movable knife has a thread-hooking groove, and the upper edge of the hook groove forms the moving cutting edge. When the movable knife swings upward, the hook groove is aligned vertically with the needle drop hole. When the movable knife swings downward, its moving cutting edge engages with the auxiliary cutting edge. The pressure plate is movably connected to the upper side of the movable knife. The movable knife also has a return spring acting on the pressure plate. When the auxiliary cutting edge engages with the movable cutting edge, the thread-cutting end of the auxiliary knife abuts against the lower side of the pressure plate. This invention improves the reliability and service life of the thread-cutting structure.
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