Sheet feeding or delivering – Feeding – With means to interrupt feeding
Patent
1989-08-08
1991-03-12
Schacher, Richard A.
Sheet feeding or delivering
Feeding
With means to interrupt feeding
B65H 714
Patent
active
049989987
ABSTRACT:
A sheet discriminating apparatus including a light emitter for emitting light onto a sheet being transported, a light receiver for detecting an amount of light transmitted through the sheet and a sheet discriminator for discriminating a specified kind of the sheet from others and/or abnormal feed of sheets based upon the amount of light transmitted through the sheet detected by the light receiver, the sheet discriminator including an average value calculator for calculating an average value of the amount of light transmitted through the sheet detected by the light receiver at a predetermined time intervals, a reference data calculator for calculating and storing a reference data based upon the average value of the amount of light transmitted through a preceding sheet to the sheet to be discriminated stored in the average value calculator, and an average data comparator for comparing the average value of the amount of light transmitted through the sheet calculated in the average value calculator with the reference data calculated by the reference data calculator and discriminating the specified kind of sheet from others and/or abnormal feed. The thus constituted apparatus can discriminate whether or not sheets are of a specified kind and/or whether or not abnormal feed of sheets such as double feed occurs for various kind of sheets.
REFERENCES:
patent: 4462587 (1984-07-01), Graef
patent: 4491929 (1985-01-01), Ikoma
patent: 4605926 (1986-08-01), Onishi
patent: 4703172 (1987-10-01), Sherman
patent: 4741526 (1988-05-01), Reed
patent: 4761002 (1988-08-01), Reed
Matoba Yasuhiko
Shigetoshi Imai
Laurel Bank Machines Co. Ltd.
Schacher Richard A,.
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