Photoelectric scanner with light-reflector or light barrier

Details Photoelectric scanner with light-reflector or light barrier Photoelectric scanner with light-reflector or light barrier

1986-03-26

1988-02-23

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250561, B65H 23032

Patent

active

047272600

ABSTRACT:
A photo-electric scanning device 1, with tubular housings 2, 3 with light source 15 and receiving element 16 and 17, respectively, arranged transversely and enclosing a web between them. The receiving element 17 cooperates with the light source 15 either according to the reflection principle or the light barrier principle. For light source 15 two receiving elements 16, 17 are provided which are capable of being actuated, of which either the first 16 cooperates with the light source 15 according to the reflection principle or the second 17 according to the light barrier principle. The first receiver 16 is closer to the light source 15 than the second receiving element 17. In this manner, operation is continuous with both receiving elements 16, 17.

REFERENCES:
patent: 3461302 (1969-08-01), Benson et al.
patent: 4222064 (1980-09-01), Lodzinski
patent: 4641070 (1987-02-01), Pfizenmaier et al.

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