| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a developing device, process cartridge and image forming apparatus, which are designed such that supplied toner is prevented from directly reaching a developing sleeve in a low charged or uncharged state, deterioration of developer is less even when an image forming process is repeated for a long time or when particular use in which toner consumption is less continues for a long time, and soiling of a base and scattering of toner are prevented for a long time. <P>SOLUTION: The torque T2 of the entire developing unit and the axial torque T1 of a conveying screw in a supply-side stir chamber satisfy the following equations: (1) T1>0.2[kgf cm] and (2) T1/T2>0.25. This makes it possible to provide the developing device and image forming apparatus, in which deterioration of developer is less and soiling of the base and scattering of toner are prevented for a long time. <P>COPYRIGHT: (C)2007,JPO&INPIT |
