| 摘要 |
PURPOSE:To perform high-picture-quality development which is stable for a long period by providing a rotatable metallic sleeve which conveys a developer and a scraper which scrapes off a developer, and forming the scraper of a metal of different kind from the metallic sleeve. CONSTITUTION:A developer control member 4 controls the flow rate of a developer sticking on the sleeve 2 to perform excellent electrostatic charging, and the scraper 5 scrapes off a developer which still remains after an exposure latent image on a photosensitive body 1 is developed reversely. The scraper 5 needs to be brought into strong contact with the sleeve so as to increase the agitation effect of the upper and lower layers of the sleeve 2 by removing a filming material. Therefore, when the material of the same kind with the sleeve is used for the scraper, the surface of the sleeve 2 is flawed to generate an image defect. On the other hand, when a scraper 5 made of phosphor bronze is used in combination with a sleeve 2 of, for example, stainless steel, wear is small and flawing is suppressed. Consequently, high picture quality which is stable for a long period is obtained. |
