Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-06-30
1976-05-11
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250548, G01D 2104
Patent
active
039566323
ABSTRACT:
Means for automatically positioning light sensing means relative to a linear series of light sensitive areas, e.g., apertures, on a longitudinally moving conveyor belt which is monitored by the sensing means. Rollers are used to receive the side edges of the belt, such rollers being freely rotatable so as to reduce the tendency of the belt edges to fray or otherwise degrade. The light sensing means and rollers are both mounted on a suspended frame means which moves transversely in response to transverse movements of the belt, whereby the sensing means is always aligned with the linear series of light sensitive areas on the belt.
REFERENCES:
patent: 3323700 (1967-06-01), Epstein et al.
patent: 3582663 (1971-06-01), Troast et al.
Beddell Donald F.
Hall Derek
FMC Corporation
Kelly R. S.
Nelms David C.
Schipper J. F.
Smith Alfred E.
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