| 摘要 |
PURPOSE:To prevent an undesirable condition where a thin layer of a developing agent of uneven thickness is supplied for development under the uneven condition and to improve the quality of a picture, by providing a thickness uniformizing member at the downstream side of a thickness controlling member in the developing agent carrying direction. CONSTITUTION:The 1st doctor blade 6 is provided as a thickness controlling member at the downstream side of a toner supplying roller 5 in the direction, in which toner is carried, and the thickness of the toner layer carried by a developing sleeve 1 is controlled. At the same time, the doctor blade 6 frictionally charges the toner layer with necessary electric charges and forms a thin layer of toner. The 2nd doctor blade 7 is provided as a thickness uniformizing member at the downstream side of the 1st doctor blade 6 and the thickness of the toner thin layer is uniformized so as to obtain a toner thin layer which is suitable for development. The 2nd doctor blade 7 is made of a fluorine-containing resin which is excellent in noncohesiveness and, even when streaks, etc., are produced on the surface of the toner layer by toner firmly adhering to the 1st doctor blade 6 or a clogging foreign matter, the streaks, etc., are erased by the 2nd doctor blade 7 and a toner thin layer of a uniform thickness can be obtained stably. |
