Item counting apparatus
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United States of America Patent
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Nov 6, 1984
Grant Date -
N/A
app pub date -
Dec 21, 1981
filing date -
Dec 21, 1981
priority date (Note) -
Expired
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Abstract
An electro-optical counter or detecting apparatus for detecting passage of items therepast. A light emitter projects a constantly pulsed beam of light onto the path of the items and light sensors sense the optical energy reflected from such items. One sensor controls the light emitter to so regulate the amount of light emitted by each pulse that the amount of optical energy reflected by the items does not vary as a function of the reflectivity of the surfaces of such items and does not exceed a predetermined level. Another light sensor senses changes in optical energy beyond such predetermined level and thus senses only the passage of an edge of each item past the pulses light beam.
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