| 摘要 |
PURPOSE:To eliminate the positional deviation of a transferred image due to the kind or contamination of transfer paper by adjusting the point of the time when a start signal for scanning exposure in the upper part or a start signal for paper feed is generated according to the quantity of the light detected with a photoelectric sensor. CONSTITUTION:The 1st photoelectric sensor 10 which is a detector for transfer paper and the 2nd photoelectric sensor 20 which is a generator for data on the kind of the paper are provided on the way of a path for conveying the transfer paper from a paper feed part 8 to a transfer part T. When the output voltage E0 of a photodetector 10B of the detector for transfer paper exceeds a reference voltage Ef, an output E1 detecting the transfer paper is outputted and is used as a start signal for scanning the exposure. The output voltage E0 from the sensor 20 which is a generator for data on the kind of the paper latches the output voltage E0 of a phototransistor 20B at said point of time by a sampling pulse SP and converts the same to 4-bit b0, b1, b2 and b3. The binary data on the quantity of light is thus obtd. from an A/D converter 21 according to the kind of the paper (including the presence or absence of contamination). The start of the scanning for exposure is regulated with a microcomputer. |
