Speed control device for a sewing machine

Details Speed control device for a sewing machine Speed control device for a sewing machine

1977-06-03

1979-10-30

Rubinson, Gene Z.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318314, H02P 506

Patent

active

041729897

ABSTRACT:
A speed control device for a sewing machine includes at least means for providing a speed reference voltage signal, means for producing a motor speed voltage signal responsive to an actual speed of the driving motor, and means for comparing the speed reference voltage signal with the motor speed voltage signal to provide a speed difference signal. The speed difference signal is utilized to determine triggering angle of a thyristor means for controlling the motor speed and to maintain the predetermined motor speed irrespective of any variation in the driving torque of the motor, the voltage of the power source and the frequency of the A.C. power source.

REFERENCES:
patent: 3792330 (1974-02-01), Ottoson
patent: 3946293 (1976-03-01), Feld

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