Photoreceptor belt motion sensor using linear position sensors

Details Photoreceptor belt motion sensor using linear position sensors Photoreceptor belt motion sensor using linear position sensors

1993-05-20

1995-01-17

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

250571, 198301, 1985024, 355308, 356373, G01P 336, G01N 2186, G03G 2100, B65G 4300

Patent

active

053830148

ABSTRACT:
The velocity of a photoreceptor belt is measured by sensing the passing of illuminated slits in the belt, as the belt moves in a process direction. Two linear position sensors are positioned so as to view the passing of the illuminated slits. The sensors are aligned in a staggered configuration so that there is an overlap region. The slits are positioned so that as one slit is moving off of a downstream sensor, a second slit is moving over the upstream sensor. The output from an illuminated sensor is alternately switched to the second sensor. The sensor outputs are differentiated to provide an output signal representing a belt velocity. The velocity is compared to said velocity in the belt drive system and error signals generated to compensate for detected changes in the belt velocity.

REFERENCES:
patent: 3598493 (1971-08-01), Fisher
patent: 3838250 (1974-09-01), Naas et al.
patent: 4518856 (1985-05-01), Blackington
patent: 4667098 (1987-05-01), Everett
patent: 4837636 (1989-06-01), Daniele et al.
patent: 5204620 (1993-04-01), Costanza et al.
patent: 5259544 (1993-11-01), Hashimoto
patent: 5264872 (1993-11-01), Wong

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