Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-07-18
1991-11-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250561, G01V 904
Patent
active
050650092
ABSTRACT:
A method for detecting roller breakdowns in a roller hearth kiln is provided, wherein: a light shielder is provided at the follower end of each roller in said roller hearth kiln, and two sets of light transmitters and two sets of light receivers are provided on two straight lines between which the axis of rotation of each shielder is positioned, whereby whenever light rays transmitted from said two sets of light transmitters to said two sets of light receivers are not periodically put on and off, at least one of said rollers is taken as breaking down.
REFERENCES:
patent: 3604940 (1971-09-01), Matthews
patent: 4015123 (1977-03-01), Small et al.
Allen Stephone
Nelms David C.
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