PURPOSE: To eliminate the indistictness of a signal to be caused when the brightness of a sheet edge alternates between positive and negative by rectifying the differentiated and summed output of a sensor in the counting of plural piled sheets.
CONSTITUTION: A sensor array 170 consisting of sensors 170a, 170b whose widths are W receives light from the sheets 172 piled in a plural number through an objective lens 174, and outputs output signals B, C. (W is made more narrow than the pitch P of the sheet 172 as much as possible). The signals B, C are inputted to a differentiating and summing preamplifier 176 and are differentiated and summed, and are outputted as the signal D. Then, this signal D has the indistinctness as the signal when the brightness of the sheet edge alternates between the positive and the negative. Accordingly, this is eliminated by rectifying the signal D by a full-wave zero offset rectifier 56, and the signal E is obtained. Then, this signal E is inputted to a processor 80 through filters 94, 98.
| JPH07141483 | DEVICE FOR COUNTING NUMBER OF SHEETS |
TOMASU II KURIIMAN
POORU II RIDORU
| JPS5930182A | 1984-02-17 | |||
| JPS6097204A | 1985-05-31 | |||
| JPS57169633A | 1982-10-19 | |||
| JPS6220709A | 1987-01-29 | |||
| JPS54118296A | 1979-09-13 | |||
| JPS56137807A | 1981-10-28 |
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