Cover member, developing cartridge and developing unit for image forming apparatus

摘要

A developing unit includes a developer cartridge containing developer and a developing cartridge (100) with a developing cartridge body (110) comprising a mounting portion (130) and a cover member (10). The mounting portion accepts the developer cartridge for replenishing developer consumed by the developing cartridge. The cover member preferably comprises a waste developer collecting portion and closes an opening of the mounting portion when the developer cartridge is not inserted into the mounting portion. When a developing unit is initially constructed, printing is performed using developer contained in the developing unit. A developer cartridge containing developer can be inserted into the developing unit, allowing the supply of developer in the developing unit to be replenished.