Speed control device for sewing machines

Details Speed control device for sewing machines Speed control device for sewing machines

1979-12-10

1982-08-17

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318345H, 318441, 112275, H02P 516

Patent

active

043451969

ABSTRACT:
An electric sewing machine has an A.C. driving motor controlled by a triac; a controlling circuit for the triac includes a thyristor powered by a lower-voltage battery via an adjustable RC-circuit; the controlling circuit is electrically insulated from the A.C. power-supply circuit by an optoelectric coupler, the optical part of which is connected to the A.C. circuit and the electric part of which controls the gate of the thyristor in synchronism with the A.C. voltage; the thyristor in the controlling circuit is coupled to the triac by means of an insulating pulse transformer.

REFERENCES:
patent: 3636379 (1972-01-01), Moe et al.
patent: 3648077 (1972-03-01), Evalds
patent: 3665219 (1972-05-01), Teske
patent: 3705990 (1972-12-01), Pileckis
patent: 3940634 (1976-02-01), Grogan
patent: 4123113 (1978-10-01), White et al.
patent: 4229669 (1980-10-01), Smith

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