| 摘要 |
PURPOSE:To reduce the errors of unmagnification by respectively detecting the speed or the circumferential speed of a scanner a photosensitive body and a carrier roller, comparing the detected values with a reference speed which is previously set and adjusting the speeds of respective driving sources. CONSTITUTION:Aimed values for a scanner motor 12, a photosensitive body driving motor 20 and a carrier roller driving motor 21 are obtained by comparing the actual values of the speed of the scanner 7 and the circumferential speeds of the photosensitive body and the carrier roller 13 and 19 arithmetically operated by a CPU 100 based on the signals detected by respective sensors 33, 47 and 56 with the reference value and multiplying the initial aimed values for controlling the motors by the inverse number of that ratio. The adjustment of the aimed values for controlling the three motors 12, 20 and 21 is executed by successively depressing a program key 110 and the previously selected key of ten keys 109 for setting the number of the copied sheets. By respectively and independently adjusting the speed of the scanner, the circumferential speed of the photosensitive body and the circumferential speed of the carrier roller which are concerned with the error of the unmagnification in this way, the errors of the unmagnification can be reduced without deteriorating other characteristic values which determine the quality of a copied image. |
