Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1974-07-12
1977-03-29
Chatmon, Jr., Saxfield
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250227, 340258B, G01D 2104
Patent
active
040151220
ABSTRACT:
A photo-electric light curtain for braking and terminating power to the ram of a press when an obstruction is detected in the curtain area uses an elongated fluorescent lamp as the light source. A number of spaced lens systems arrayed on the opposite side of the curtain area from the lamp focus on spaced points along the lamp. Fiber-optic strands connect the focal point of each of the lens systems with points arrayed about the stationary element of a circular commutator which are scanned by another fiber-optic element having one end affixed to a rotary commutator element and the other end feeding a photodetector. The output signals from the photodetector are processed to detect obstructions along the focal axis of any of the lens systems by fail-safe digital circuitry which provides an output when this blockage is detected for several cycles of the commutator. Counter circuitry, preset by manual switches, allows the system to ignore light blockages caused by permanent installations.
REFERENCES:
patent: 3183499 (1965-05-01), Cowen
patent: 3602640 (1971-08-01), Maillet
patent: 3746863 (1973-07-01), Pronovist
patent: 3764813 (1973-10-01), Clement et al.
patent: 3786265 (1974-01-01), Abilock et al.
patent: 3805061 (1974-04-01), De Missimy et al.
patent: 3810148 (1974-05-01), Karsten et al.
patent: 3811648 (1974-05-01), Ream, Jr. et al.
Chatmon, Jr. Saxfield
Moore David K.
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