Apparatus for discriminating sheets
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United States of America Patent
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-
Oct 5, 1982
Grant Date -
N/A
app pub date -
Nov 14, 1980
filing date -
Nov 22, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sheet discriminating apparatus comprises, in addition to a first detecting system for detecting light transmitted through a sheet and a second detecting system for detecting light reflected by the front surface of the sheet, a third detecting system for detecting light reflected by the rear surface of the sheet. The light doses sensed by these detecting systems are integrated by respective integrators for a predetermined period of time, and the outputs obtained from the integrators are coupled to an adder and added together therein. The sum output of the adder and a reference signal generator are compared with each other in a comparator, and the determination as to whether the sheet in question is adequate for re-use or not is effected on the basis of the result of the comparison.
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