| 摘要 |
PROBLEM TO BE SOLVED: To prevent a deterioration in image quality by preventing the sticking of toner to a blade pressed on a developing roller, in a developing unit for an image forming device. SOLUTION: Fixed voltages are applied to a supplying roller 13, the developing roller 14 and the blade 15 which are arranged in the developing unit 10, from power sources 30a, 30b and 30 respectively. A voltage control means 31 is provided in a path for applying a voltage to the blade 15 and a voltage control switch 31 is operated through a command circuit 37 by the command of the controller 36 of a device main body, to execute the operation of starting or stopping the feeding of power, in the prestage of making a copy or after copying is completed. Thus, the toner stuck to the blade is shaken off by an electrical vibration. |
