| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the cause of an abnormal image such as a transfer defect or rear staining and to obtain a high-quality image by arranging a porous member on a more downstream side than the developing part of a photoreceptor and at the part of the aperture end part of a casing facing the surface of the photoreceptor in the rotating direction of a developing roller. SOLUTION: A projection part C projecting toward an interval between the photoreceptor 1 and the developing roller 3 is formed at the tip part of a lower jaw part 21. The shape of the cross section of the projection part C is constituted of an inclined surface 21a on the photoreceptor 1 side and an inclined surface 21b on the roller 3 side. Besides, a sponge member 22 as the porous member is fixed to the inclined surface 21a, that means, the part of the jaw part 21 facing the photoreceptor 1. By such constitution, toner from the roller 3 at a developing time or toner from the photoreceptor 1 after a developing action is scattered on the sponge member 22 and the inclined surface 21b. Since the toner scattered on the sponge member 22 side is sucked and held by the sponge member 22, the inside of an image forming device is prevented from being soiled by the toner. |
