| 摘要 |
PURPOSE:To flow a developer uniformly by providing a cleaning assistant giving means, where magnetic materials different in polarity or magnetic materials and nonmagnetic materials exist alternately, between the area, where a latent image is developed, and a member which controls the quantity of developing materials. CONSTITUTION:A photosensitive drum 1 is turned around a revolving shaft 2 in the direction of an arrow F and is charged electrostatically by a corona discharger 3, and a latent image is formed by an exposure device 4, and a toner image is formed by a developing machine 7. In the developing machine 7, a magnet roll 9 where magnetic poles N and S are arranged alternately is rotated in the direction of an arrow G. A brass sleeve 10 is turned on the outside of the magnet roll 9 in the direction of an arrow H (opposite to the direction of the arrow G). The quantity of developing materials is controlled by a blade 12, and a cleaing assistant layer C is supported by a supporting member 13, and magnetites 13A and aluminium layers 13B are arranged alternately in the supporting member 13. A bias voltage is impressed from a power source 14 to the sleeve 10 to control development conditions. Thus, agitation and tuft of the developer occur effectively to flow the developer uniformly, and cleaning is performed effectively. |
