Automatic yarn cutting device for sewing machine, has rotation shuttle part, power transmission shaft arranged in rotation shuttle part and cam unit arranged in power transmission shaft

摘要

The automatic yarn cutting device has a rotation shuttle part (1), a power transmission shaft (2) arranged in the rotation shuttle part and a cam unit (4) arranged in the power transmission shaft. A driver (5) rotates the cam unit around a central axis (50), where the central axis moves according to the axial direction of the power transmission shaft.