| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing unit capable of suppressing a reduction in image quality after developer is supplied, a process cartridge, an image forming apparatus, and a developer supply method.SOLUTION: When a developing unit 23 is made to have an attitude of being turned upside down in a vertical direction with an attitude when being attached to an image forming apparatus body as a reference (reverse attitude), while a toner cartridge as a developer container is supplied at once with a new toner T1, a toner supply port 89 is arranged so that the toner supply port 89 as a developer supply port is disposed above a draft surface in a vertical direction of a toner in a hopper unit 86 as a developer storage unit. |
