Developing device including rotatable resilient roller for supplying developer to and removing developer from a developer bearing member

摘要

A rotatable developing roller for carrying out a developer from a vessel containing one-component developer to be conveyed to a developing portion is provided with a developing roller a resilient roller in contact with and rotatable within the vessel. This resilient roller is an independently-porous foam roller having an Asker C hardness of 8° to 15°, and is placed into contact with the developing roller so that the variation in a radial direction is 0.5 mm to 1.5 mm. In another aspect, under a surface layer of a cellular material, there is provided an intermediate layer of a cellular material having a compression resiliency lower than that of the surface layer.