| 摘要 |
PURPOSE:To obtain a highly reliable recording device of simple constitution by controlling the timing of recording operation according to the rotating speed of an AC motor while the rotation of a DC motor for a original scanning system is controlled in specific relation with the rotation of the AC motor. CONSTITUTION:The rotation state of the AC motor 21 which rotates a photosensitive drum is detected by an encoder 21 and a frequency-voltage converter 102 nd its difference from the rotation state of the DC motor 105 for driving an original scanning optical system which is detected similarly is calculated by an operational amplifier 103 to control the motor 105, so that the motors 21 and 105 enter specific rotation state relation. On the other hand, the output of this encoder 101 is impressed to a control circuit 120 t deg. control the timing of recording operations such as exposure, scanning, and paper feeding. This two-motor system which does not depend only one motor realizes the highly reliable recording device of simple constitution. |
