Device for detecting a moving object

Details Device for detecting a moving object Device for detecting a moving object

1976-03-10

1977-01-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Housings

250222R, 250561, H01J 502

Patent

active

040015815

ABSTRACT:
A device for detecting the presence of a moving object, especially in a rotary camera, copier or printer, comprises transport rolls for the object. A pair of reflector members are disposed in opposed relationship so as to define an object transport passage therebetween. The opposed surfaces of the reflector members provide light reflecting surfaces. A light source and a non-transparent member are disposed at or adjacent one end of the reflector members for emitting light into the gap between the reflector members, and a light receiving element is disposed at or adjacent the other end of the reflector members for receiving a light beam passed thereto under repetitive reflections between the reflector members. The non-transparent member prevents the light from the light source from directly reaching the light receiving element. The light reflected between the reflector members may be intercepted by an object transported therebetween, thus detecting the presence of the moving object.

REFERENCES:
patent: 2324304 (1943-07-01), Katzman
patent: 2753464 (1956-07-01), Stone
patent: 3041462 (1962-06-01), Ogle
patent: 3489910 (1970-01-01), Bohme

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