| 摘要 |
PURPOSE:To prolong the life of a photosensitive drum by making the rotating speeds of the photosensitive drum and a heating roller which are synchronously driven to be rotated by the same driving source at the time of warming up lower than at the time of normally forming an image. CONSTITUTION:This device is provided with a control means 13 which drives the heating roller 9 and the photosensitive drum 1 so that the rotating speed may be increased stepwise within a speed range which is lower than the rotating speed at the time of performing the normal image forming action before the roller 9 attains a temperature required for fixing after turning on a power source. In the period of warming-up after turning on the power source, a motor 14 for driving the roller 9 and the drum 1 is driven stepwise in accordance with the output of a temperature element 12 for detecting the temperature of the roller 9. Therefore, a noise at the time of driving is kept low and abrasion between the drum 1 and a cleaning device 7 is reduced, thereby restraining the life of the drum 1 from becoming short. |
