Programmed brake for controlling the speed of a scanning carriag

Details Programmed brake for controlling the speed of a scanning carriag Programmed brake for controlling the speed of a scanning carriag

1980-10-02

1983-02-01

Moses, R. L.

Photocopying

Including fiber optics

355 14R, G03G 1528

Patent

active

043712541

ABSTRACT:
The present invention is a programmed brake for controlling the deceleration of a scanning carriage. An encoder including an electro-optic sensor mounted on a moving carriage together with a stationary grating having a plurality of unevenly spaced apertures, provides velocity data of the rate of the relative movement of the sensor and grating during flyback or scan return. In particular, the sensor detects a plurality of light pulses through each of the apertures as the sensor moves relative to the grating. The light signals are conveyed to a counter and the count is compared to a reference number representing a deceleration profile or standard number of signals desired for each aperture. If the number of light signals is less than the standard, occurring if the carriage is overspeed, a transistor driver is pulsed to activate an electromagnetic brake connected to the scanning carriage. When the scanning carriage velocity has slowed sufficiently, the brake is inactivated.

REFERENCES:
patent: 3424526 (1969-01-01), Sacre
patent: 3554640 (1971-01-01), Hoskins
patent: 3907422 (1975-09-01), Eppe et al.
patent: 3950091 (1976-04-01), Brooke
patent: 3990792 (1976-11-01), Kono et al.
patent: 4150873 (1979-04-01), Dali
patent: 4280763 (1981-07-01), Arai et al.
U.S. Ser. No. 80,624 filed 10/1/79 by Warren Hall, Jr., entitled "Open Loop Controller."

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