Speed control device of sewing machines

Details Speed control device of sewing machines Speed control device of sewing machines

1980-05-15

1982-01-12

Smith, Jr., David

Electricity: motive power systems

Three-or-more-positions motor controller systems

Knee- or foot-operated controllers

318313, 318345D, 318345H, H02P 516

Patent

active

043107885

ABSTRACT:
A speed control device for a sewing machine which is adapted to control a speed of the machine motor. The device includes a plurality of photo-conductive fibers arranged in two sets, one set being optically positioned opposite to another. The device also includes a light source which transmits the light to the photo-conductive fibers, a photo-conductive element which receives the light from the fibers and a phase-controlling element connected to the photo-conductive element and to the machine motor. An interrupting plate secured to a step plate of the sewing machine is provided in the device which is adapted for reciprocable movement between the optically sensitive ends of aforementioned two sets of the photo-conductive fibers. The photo-conductive element generates an ignition current in the phase-controlling element in response to a predetermined amount of light transmitted from one set of fibers connected to the light source to another one whereby the phase-controlling element effects the machine motor to change the speed thereof.

REFERENCES:
patent: 3475676 (1969-10-01), Hutson
patent: 3742233 (1973-06-01), Gorgens et al.
patent: 3857077 (1974-12-01), Kasmer
patent: 4105938 (1978-08-01), Mathews, Jr.

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