| 摘要 |
In order to apply bias to a charging roller for charging a surface of a photoconductive drum uniformly, a power supply roller, which rotates while contacting with a surface of the charging roller, is provided. Brushes may be provided on the surface of the power supply roller. Further, by providing a member for removing a toner and sheet particles adhering to the surfaces of the charging roller and the power supply roller, the surface of the charging roller can be maintained in a clean condition and the surface of the photoconductive drum can be charged statically and uniformly.
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