Apparatus for discriminating sheets
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorTsuyoshi Ishida
Life of this patent
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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.
Claims10
An apparatus for discriminating sheets being transferred into adequate and inadequate sheets through detection of contamination of these sheets, comprising:
- a reference signal generator;
- a first detecting system for detecting light transmitted through said sheets;
- a second detecting system for detecting light reflected by the front surface of said sheets;
- a third detecting system for detecting light reflected by the rear surface of said sheets;
- a detector for detecting the passage of each of said sheets therethrough;
- first to third amplifiers for amplifying the outputs of said respective first to third detecting systems;
- first to third integrators for integrating the outputs of said respective first to third amplifiers;
- a control circuit for supplying an integration period signal to each of said first to third integrators according to a detection signal produced from said detector;
- an adder for taking the sum of the output signals from said first to third integrators;
- and
- a comparator for comparing the output signal coupled as one of two inputs from said adder and the output signal coupled as the other input from said reference signal generator thereby effecting the determination as to whether or not the sheet in question is adequate.
An apparatus for discriminating sheets being transferred into adequate and inadequate sheets through detection of contamination of these sheets, comprising:
- a reference signal generator;
- a first detecting system for detecting light transmitted through said sheets;
- a second detecting system for detecting light reflected by the front surface of said sheets;
- a third detecting system for detecting light reflected by the rear surface of said sheets;
- a detector for detecting the passage of each of said sheets therethrough;
- first to third amplifiers for amplifying the outputs of said respective first to third detecting systems;
- first to third integrators for integrating the outputs of said respective first to third amplifiers;
- a control circuit for supplying an integration period signal to each of said first to third integrators according to a detection signal produced from said detector;
- first and second adders connected to said first to third integrators such that said first adder takes the sum of light reflected by the front surface of each of said sheets and light transmitted therethrough and said second adder takes the sum of light reflected by the rear surface of the sheet and light transmitted therethrough;
- and
- a comparator for comparing the output signal coupled as an input from said first or second adder and the output signal coupled as another input from said reference signal generator, thereby effecting the determination as to whether or not the sheet in question is adequate.
Dependencies are inferred from the claim text.