US 6,983,115 B2
Developing cartridge and process cartridge having first and second projected portions and image forming apparatus mounting such a developing cartridge
Hironobu Isobe, Numazu (Japan); Yasufumi Yoshino, Numazu (Japan); and Koji Yamaguchi, Numazu (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on Sep. 24, 2003, as Appl. No. 10/668,494.
Claims priority of application No. 2002-286920 (JP), filed on Sep. 30, 2002.
Prior Publication US 2005/0191091 A1, Sep. 01, 2005
Int. Cl. G03G 15/01 (2006.01)
U.S. Cl. 399—119 19 Claims
OG exemplary drawing
 
1. A developing cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said apparatus comprising:
a frame;
a developing device configured and positioned to develop an electrostatic latent image formed on an electrophotographic photosensitive member;
a first projected portion, projected from said frame and configured and positioned to engage a first positioning portion provided in the main assembly of the apparatus when said developing cartridge is set in the main assembly of the apparatus to position said developing cartridge and around which said developing cartridge can rotate;
a second projected portion, projected from said frame and configured and positioned to engage a second positioning portion provided in the main assembly of the apparatus when said developing cartridge is set in the main assembly of the apparatus to regulate rotation of said developing cartridge about said first positioning portion; and
a cartridge guide member, projected from said frame and configured and positioned to contact to a main assembly guide portion provided in the main assembly of the apparatus to guide said developing cartridge when said developing cartridge is in the process of being mounted to the main assembly of the apparatus,
wherein said cartridge guide member is urged to urge said second projected portion in a direction to contact said second projected portion to said second positioning portion when said developing cartridge is set in the main assembly of the apparatus.