Programmed acceleration

Details Programmed acceleration Programmed acceleration

1980-12-04

1983-06-07

Rubinson, G. Z.

Photocopying

Including fiber optics

G03G 1528

Patent

active

043868428

ABSTRACT:
The present invention is a programmed clutch for controlling the acceleration of a scanning carriage at scan return (flyback). 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 acceleration. In particular, the sensor detects light through each of the apertures as the sensor moves relative to the grating. The light signal time is conveyed to a counter and the time is compared to a reference number representing an acceleration profile or standard number of signals desired for each aperture. If the number of light signals is more than the standard, occurring if the carriage is underspeed, a transistor driver is pulsed to activate an electromagnetic clutch connected to the scanning carriage. When the scanning carriage velocity has increased sufficiently, the clutch is inactivated.

REFERENCES:
patent: 3424526 (1969-01-01), Sacre
patent: 3554640 (1971-01-01), Hoskins
patent: 4000943 (1977-01-01), Bar-on
patent: 4150873 (1979-04-01), Dali
patent: 4243311 (1981-01-01), Tohyama et al.
patent: 4287461 (1981-09-01), Promis et al.
U.S. Ser. No. 80,624, filed 10/1/79 by Warren Hall, Jr., entitled "Open Loop Controller".

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