Light barrier arrangement

Details Light barrier arrangement Light barrier arrangement

1977-05-06

1979-05-29

Shoop, William M.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361191, 340556, 250222R, H01H 4724

Patent

active

041568834

ABSTRACT:
A light barrier system for monitoring the presence or absence of an obstacle in the monitored area and for simultaneously monitoring itself to detect contamination of the system. A photo-converter emits signals indicative of the light intensity of a light barrier beam and the signal is applied to a first, obstacle switch which is normally open but which closes at a relatively high level of darkness, i.e. when an obstacle is present. A converter signal is also applied to a second, contamination switch which is normally open but which closes at a lesser degree of darkness than the first switch so that both switches can be simultaneously closed. The outputs of the switches when closed are applied to relays to switch the relays between alternative position to indicate (a) the presence of an obstacle in the light curtain area and (b) the contamination of the light curtain system irrespective of whether or not an obstacle is present.

REFERENCES:
patent: 3211961 (1965-10-01), Bayly et al.
patent: 3360654 (1967-12-01), Muller
patent: 3536923 (1970-10-01), Tellerman
patent: 3743290 (1973-07-01), Crimmins et al.
patent: 4012635 (1977-03-01), Walter et al.

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