Agitation and charging device for an image forming apparatus

摘要

A rotary developing device includes a developing unit having plurality of developing chambers arranged around an axis rotation with each having a developer agitating device located therein wherein the rotary developing device is rotatable about the axis to locate any one of the plurality of developing chambers at a developing position where an image carrier is located, the developer agitating device of one of the plurality of developing chambers located at the developing position and the developer agitating device of at least one of the other developing chambers being drivable and wherein the developer agitating device of the at least one of the other developing chambers has a higher agitation speed than the developer agitating device of the one developing chamber located at the developing position.