Sheet discriminating apparatus with hole-detecting means

Details Sheet discriminating apparatus with hole-detecting means Sheet discriminating apparatus with hole-detecting means

1986-09-03

1988-04-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356430, G01N 2188

Patent

active

047376490

ABSTRACT:
A sheet discriminating apparatus comprising means for detecting both light reflected by and light transmitted through a sheet, upon irradiation of light onto the sheet; hole-detecting means for detecting whether or not there is a hole in the sheet on the basis of an output of the light-detecting means, the hole detecting means generating a signal when a hole is detected in the sheet; means for gating the output of the light-detecting means in accordance with the hole signal; and means for detecting the degree of soiling of the sheet in accordance with an output of the gating means. During operation of the sheet discriminating apparatus, when excess light is detected by the light-detecting means, the hole-detecting means outputs a hole signal, and in response to the hole signal the gating means selectively gates the output of the light-detecting means to the means for detecting the degree of soiling. If there is no hole in the sheet, it is then judged whether or not the sheet is fit or unfit for continued use.

REFERENCES:
patent: 4189235 (1980-02-01), Guter et al.
patent: 4352988 (1982-10-01), Ishida
patent: 4429991 (1984-02-01), Williams
patent: 4516031 (1985-05-01), Kaule et al.
patent: 4587434 (1986-05-01), Roes et al.

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