Optical-mechanical rotation sensing mechanism for a web-roll

Details Optical-mechanical rotation sensing mechanism for a web-roll Optical-mechanical rotation sensing mechanism for a web-roll

1990-04-09

1991-01-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250229, G01D 534

Patent

active

049873008

ABSTRACT:
An optical-mechanical rotation sensing mechanism for a web-roll rotatably mounted within a cartridge comprises a flange on the web-roll, activating means on the flange, and an optical sensor, outside the cartridge, including a beam of light for sensing incremental rotation of the flange and web-roll. A movable flag on the cartridge exterior actuates the optical sensor in response to movement of the flag between a first position, in which the light beam is interrupted, and a second position in which the light beam is uninterrupted. A coupling means, including a light-shield hood, couples the flange activating means to the flag for moving the flag between its first and second positions.

REFERENCES:
patent: 1810324 (1931-06-01), Owens
patent: 3564219 (1971-02-01), Mufziger
patent: 3730453 (1973-05-01), Hotchkiss et al.
patent: 3779483 (1973-12-01), Inoue
patent: 3857032 (1974-12-01), Van Englehaven
patent: 3917142 (1975-11-01), Guarderas
patent: 4153361 (1979-05-01), Axelrod
patent: 4549808 (1985-10-01), Ernst

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