| 摘要 |
PROBLEM TO BE SOLVED: To effectively remove foreign objects, such as, residual toner remaining after a transfer operation and discharge products in charging from an image carrier, and to satisfactorily charge the image carrier. SOLUTION: The foreign objects, such as, the residual toner adhering to a photoreceptor 2 after the transfer operation and the discharge product are charged by a bias showing a polarity same as that of the charged potential of the foreign object by a first charging member 8. The foreign object on the photoreceptor 2, charged by the first charging member 8, is caught and collected by a second charging member 9, to which a bias showing a polarity opposite to the charged potential of toner. The foreign object caught and collected by the second charging member 9 is collected by a collection roller 10, to which a bias is applied. At such a time, by controlling the bias to be applied to the collection member 10, at least a prescribed fixed quantity of external additive is made to adhere to the second charging member 9 after passing by the collection roller 10. The photoreceptor 2 is charged by the second charging member 9 to which the external additive is made to adhere, and the foreign object deposited on the photoreceptor is scraped off. COPYRIGHT: (C)2009,JPO&INPIT
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