Sewing – With tables or stands – For plural sewing units
Patent
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
Marsilia Louis P.
Moran Robert J.
Clinton Industries, Inc.
Hunter H. Hampton
Liberman William R.
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