Thread drawing device for sewing machine, has thread tension-primary control device arranged on base plate, thread tension-secondary control device arranged on base plate, and thread drawing-electromagnet provided on side of base plate

摘要

The device has a thread release-electromagnet arranged on a rear side of a base plate (11) and provided with a movement pin that is pressed against a thread release plate. A thread tension-primary control device (60) is arranged on the base plate and has a support pin. The support pin is pressed against the thread release plate for tension release of the primary control device during operation of the thread release-electromagnet. A thread tension-secondary control device (70) is arranged on the base plate. A thread drawing-electromagnet (20) is provided on a side of the base plate.