Sewing machine drive motor control system

Details Sewing machine drive motor control system Sewing machine drive motor control system

1981-11-30

1984-06-26

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345C, 318345G, 112220, H02P 516

Patent

active

044568592

ABSTRACT:
A speed-control circuit for a motor of the sewing machine is disclosed. The circuit includes a controller, thyristors for controlling the rotation of the motor in dependence upon the operation of the controller, operational amplifiers activated in dependence upon the operation of the controller to produce a speed designating voltage, a frequency - voltage converter which receives a frequency representing the speed of rotation of the main shaft of the sewing machine, a comparator for comparing that speed designating voltage with the voltage of the frequency-voltage converter to detect a motor drive phase, and a light emitting diode and a phototransistor activated by the motor drive phase and operative for controlling the ignition phase of those thyristors.

REFERENCES:
patent: 3596162 (1971-07-01), Takayama
patent: 3604996 (1971-09-01), Lutz
patent: 4105938 (1978-08-01), Mathews, Jr.
patent: 4323833 (1982-04-01), Watanabe et al.

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