A thread trimming mechanism driven by a stepping motor

Abstract

This utility model discloses a stepper-driven thread-cutting mechanism, including a stepper motor, a thread-cutting cam, a thread-cutting drive rod assembly, a thread-holding plate, a movable thread-cutting blade, and a fixed blade. The stepper motor is linked to the thread-cutting cam, which has an elliptical cam groove. The thread-cutting drive rod assembly includes a rotating connector, a main drive shaft, and a movable blade connecting rod. Both ends of the main drive shaft are linked to the rotating connector and the movable blade connecting rod, respectively. The other end of the rotating connector, away from the main drive shaft, is inserted into the cam groove and movably connected to the thread-cutting cam. The movable thread-cutting blade is positioned below the needle plate of the sewing machine via a movable thread-cutting shaft. The fixed blade is fixed below the needle plate and adjacent to the movable thread-cutting blade for thread cutting. This utility model optimizes the transmission structure and thread-cutting mechanism, effectively improving thread-cutting stability and reducing the "bird's nest" phenomenon (where the thread is nested in the needle).

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