| 摘要 |
PURPOSE:To prevent the generation of an image flow, even in case a corona product has adhered onto the surface of an image carrying body, setting a set value of a temperature control means so as to be higher than usual at least for a prescribed time after a power source is turned on. CONSTITUTION:When an electric conduction detecting circuit 11 detects, for instance, OFF of an electric conduction at night, and thereafter, detects turn-on of a main switch, said circuit outputs a detecting signal to a controlling circuit 12. In such a case, the controlling circuit 12 measures humidity of the use environment by a temperature sensor 10, compares it with a reference value which is determined in advance and controls the supply power to a preheater 9. That is to say, at the time of high humidity, the supply power is made to ascend and raised quickly to a temperature control temperature, and in the course of a preliminary rotation of a photosensitive drum 1, its temperature is kept long, by which a corona product which is adhered to the surface of the photosensitive drum 1 is discharged, and generation of an image flow is suppressed. In such a case, the supply power to the preheater 9 is high, therefore, even if continuous copying is executed, a temperature of the photosensitive drum 1 does not fall, and in this respect, as well, generation of the image flow can be suppressed exactly. |
