Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1981-07-02
1984-04-24
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
242 7552, 250231SE, G01V 904
Patent
active
044450443
ABSTRACT:
A device for providing an indication of the position of a material (80) within a conveyor system includes a dancer roller (83) for engaging the material (80) and bidirectionally varying its angular position relative to a preselected axis, and a transducer (10) operatively connected via a shaft (15) to the dancer roller (83). Transducer (10) includes a plurality of light emitting diodes (21,22) and phototransistors (23,24) mounted in spatial relation upon a plate (33) perpendicularly fixed to the shaft (15) and adjustably carrying a plurality of light cams (34,35) interposed between the light emitting diodes (21,22) and the phototransistors (23,24). As the angular position of shaft (15) is varied by dancer roller (83), illumination upon phototransistors (23,24) similarly proportionally varies. A circuit (61) receiving the output of phototransistors (23,24) generates a bipolar electrical signal having a voltage magnitude proportional to the angular deviation of the dancer roller (83) from the preselected axis and a polarity dependent upon the direction of such angular deviation.
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Brophy J.
L. E. Buess, Inc.
Nelms David C.
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