Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1983-03-21
1985-10-01
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, G01V 904
Patent
active
045448418
ABSTRACT:
A detector device for detecting the passage of articles of a conveyor comprises an energy source element 8, an energy responsive element 10 and reflector means 27, 9 and 28, positioned so that a beam of energy from the source element 8 to the responsive element 10 first traverses the conveyor path substantially parallel and close to the conveyor surface and is then reflected back and forth across the conveyor path in a plane substantially perpendicular to the conveyor surface.
REFERENCES:
patent: 3025406 (1962-03-01), Stewart et al.
patent: 3041462 (1962-06-01), Ogle
patent: 3383517 (1968-05-01), Phillipson et al.
patent: 3512002 (1970-05-01), Decker
patent: 3584226 (1971-06-01), Lerner
patent: 4347438 (1982-08-01), Spielman
Bright David E.
Jones Steven K.
Gatto James
Nelms David C.
Post Office
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