Sewing machine drive control

Details Sewing machine drive control Sewing machine drive control

1972-06-02

1976-11-16

Hunter, H. Hampton

Sewing

With tables or stands

For plural sewing units

318269, 112218A, D05B 6926, H02P 312

Patent

active

039916936

ABSTRACT:
A direct motor drive system for a sewing machine wherein a low-inertia direct current motor coupled directly to the drive shaft is excited by a low impedence source of variable direct current voltage derived from a rectified alternating current signal at a manually controllable autotransformer. A needle-positioning circuit senses the needle position and either pulses or brakes the motor electrically so that the needle moves to a selected up or down position.

REFERENCES:
patent: 3367296 (1968-02-01), Harruff
patent: 3466524 (1969-09-01), Cooper
patent: 3544874 (1970-12-01), Dutko et al.
patent: 3573581 (1971-04-01), Dutko
patent: 3597672 (1971-08-01), Seesselberg

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