| 摘要 |
PROBLEM TO BE SOLVED: To prevent image deterioration by stably recovering paper powder on a photoreceptor. SOLUTION: A supply roller 26 is so provided as to be rotatable in contact with a developing roller 22. To the supply roller 26, a bias voltage whose polarity is the same as that of a development bias voltage and potential is greater than that of the development bias voltage is applied. Therefore, paper powder sticking to the surface of the developing roller 22 and tending to be negatively charged by the frictional contact is displaced onto the supply roller 26. The paper powder is potentially guided into the interior of a foam body 20 in which continuous air-holes are formed. Further, a developing blade 32 is provided so as to come in contact with the developing roller 22, and by means of the developing blade 32 the thickness of a toner layer on the developing roller 22 is restricted to predetermined value or smaller. Thus, the paper powder recovered by the developing roller 22 is securely displaced to the supply roller 26. |
