| 摘要 |
PURPOSE:To obtain a sharp image free from uneven streaks, by reciprocating an elastic rubber blade in the peripheral direction of a developing roll having a roughened surface while the blade is pressed into contact with the roll surface. CONSTITUTION:A one-component type nonmagnetic toner fed with a scooping roll 6 on the developing roll 3 rugged on the surface is controlled in thickness with the end of the roughened blade 7. When the toner agglomerated in the part A of the blade 7 side blocks, it causes uneven streaks, so the blade 7 is reciprocated in the direction of arrow (1) along the surface of the roll 3 while no image is formed, and the agglomerated toner is ground by friction with the roll 3 surface, thus forming a uniform toner layer stably with a simplified structure, and forming a sharp image free from uneven streaks. |
