Feed control device for an electronically controlled zigzag sewi

Details Feed control device for an electronically controlled zigzag sewi Feed control device for an electronically controlled zigzag sewi

1987-11-16

1988-12-20

Nerbun, Peter

Sewing

Stitch forming

Zigzag

112315, 112304, 112322, D05B 302

Patent

active

047918772

ABSTRACT:
The start and end timing of fabric feed in a sewing machine greatly affects the tightening of needle thread, that is, the sewing quality. Among the electronically controlled zigzag sewing machines, those equipped with feed means directly driven by a pulse motor supplied with command pulses, it has become possible to control freely the start and end timing of fabric feed. Disclosed is a feed control device for an electronically controlled zigzag sewing machine comprising pulse train generating means for generating feed command pulse train in a predetermined pulse train pattern depending on the number of pulses corresponding to the feed stroke of the work fabric and the speed of the main motor, and pulse train generation control means for controlling the start of operation of the pulse train generating means according to the speed of the main motor so that the vertical motion phase of the needle at the end of generation of the command pulse train by the pulse train generating means may be delayed the more as the speed of the main motor is the faster.

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