Patent ID: 6101352
Filing Date: 2000-08-08
Classification: G03G

Abstract:
A developing cartridge for developing an electrostatic image formed on an image bearing member with toner, said developing cartridge being detachably mountable to a main assembly of an image forming apparatus, comprising:a toner carrying member for carrying toner to a developing position of the image bearing member;a developing frame supporting said toner carrying member and provided with an opening;a toner frame, provided with an opening, for accommodating the toner;a covering member provided in said developing frame and having an opening; anda sealing member for sealing the opening of said covering member to prevent the supply of the toner from said toner frame to said developing frame, wherein when said opening of said covering member is unsealed, the toner is permitted to be supplied from said toner frame through the opening of said toner frame, the opening of said covering member and the opening of the developing frame to said developing frame;wherein said toner frame and said developing frame are secured to each other all around the periphery of the openings thereof, and said developing frame and said covering member are secured to each other all around the periphery of the openings thereof;wherein after said sealing member is mounted to said covering member, said covering member is adhered to the developing frame, and then said developing frame is adhered to said toner frame.