Process cartridge and image forming apparatus including drum and shaft coupling members transmitting driving forces to a photosensitive drum and a developing roller, respectively

An electrophotographic image forming apparatus for forming an image on a recording material, comprising:

• (i) a rotatable first main assembly drive transmission member and a rotatable second main assembly drive transmission member;
• (ii) a process cartridge mounted detachably to the main assembly of the apparatus of said electrophotographic image forming apparatus, said process cartridge including:
• an electrophotographic photosensitive drum;
• a developing roller configured and positioned to develop an electrostatic latent image formed on said electrophotographic photosensitive drum with a developer;
• a drum coupling member, provided on one end of a rotational axis of said electrophotographic photosensitive drum, configured and positioned to engage with the first main assembly drive transmission member and transmitting a first rotational driving force to the electrophotographic photosensitive drum, when said process cartridge is mounted to the main assembly of said apparatus along the direction of the rotational axis of said electrophotographic photosensitive drum;
• a shaft coupling member, provided on one end of a rotational axis of said developing roller, for transmitting a second rotational driving force with a deviation permitted between a rotational axis of said second main assembly drive transmission member and a rotational axis of said developing roller with respect to a direction crossing the rotational axis of said developing roller,
• wherein said shaft coupling member includes an engaging portion configured and positioned to engage said second main assembly drive transmission member and to receive the second rotational driving force, when said process cartridge is mounted to the main assembly of said apparatus, and wherein said engaging portion is movable in the direction crossing the direction of the rotational axis of said developing roller;
• and
• a holding portion configured and positioned to hold said engaging portion such that a rotational axis of said engaging portion is placed in a position deviated from the rotational axis of said developing roller with respect to the crossing direction to engage said engaging portion with said second main assembly drive transmission member when said process cartridge enters the main assembly of said apparatus;
• and
• (iii) feeding means for feeding the recording material.