Developing device, process cartridge, and image forming apparatus

摘要

A developing device causes toner to be discharged from a foam layer by an intrusion member configured to intrude into the foam layer of a supply roller, and to be supplied to above a contact region between a developing roller and the supply roller.

主权项

1. A developing device comprising:
a developer bearing member configured to bear a developer; a supply roller configured to include a foam layer on a surface thereof, and to rotate in contact with the developer bearing member to supply the developer to the developer bearing member; a developer storage portion configured to be disposed lower, in a vertical direction, than the supply roller and to store the developer; a conveyance member configured to convey the developer stored in the developer storage portion by transmitting the developer toward a contact region where the supply roller and the developer bearing member are in contact with each other; and an intrusion member intruding into the foam layer at a top of the supply roller, or at an upstream side relative to the top of the supply roller and a downstream side relative to a downstream end of the contact region in a rotational direction of the supply roller in order that the developer passed through the contact region is circulated by the intrusion member at a vicinity of the contact region.