Electronic motor speed regulating system having adjustable high

Details Electronic motor speed regulating system having adjustable high Electronic motor speed regulating system having adjustable high

1977-05-17

1978-07-04

Schroeder, Werner H.

Sewing

Elements

Driving mechanisms

112277, D05B 6918

Patent

active

040982068

ABSTRACT:
A sewing machine motor speed regulating system which provides two speed ranges which, in turn, have independently controllable maximum attainable speed adjust. This is accomplished by selectively exciting one of two variable trim resistors serially inserted in the silicon controlled rectifier gate/controller circuit.

REFERENCES:
patent: 3319591 (1967-05-01), Hamlett
patent: 3364452 (1968-01-01), Thompson et al.
patent: 3789783 (1974-02-01), Cook et al.

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