Feed device for a sewing machine

Details Feed device for a sewing machine Feed device for a sewing machine

1986-11-18

1988-01-26

Reynolds, Wm. Carter

Sewing

Stitch forming

Feeding work material

112318, D05B 2714, D05B 2722

Patent

active

047210508

ABSTRACT:
A feed device has feed members for feeding a work, and a stepping motor for directly driving the feed members. The period of driving pulses for driving the stepping motor is determined by feed control means on the basis of a speed signal indicating an actual operating speed of the main motor of the sewing machine or on the basis of a selectively set speed. The feed control means controls the stepping motor so that the feed motion of the feed members is continued also after the completion of the thread tightening operation of the take-up lever in order that the needle thread is tightened properly by the feed motion of the feed members.

REFERENCES:
patent: 4286532 (1981-09-01), Tonomura
patent: 4295435 (1981-10-01), Uemura et al.
patent: 4318360 (1982-03-01), Uemura et al.
patent: 4616583 (1986-10-01), Takano et al.

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