Process cartridge and image forming apparatus

An image forming apparatus including a main assembly and a process cartridge, wherein:

• (i) said main assembly includes:
• (i-i) a first main assembly driving portion;
• and
• (i-ii) a second main assembly driving portion;
• and
• (ii) said process cartridge is detachably mountable to said main assembly, and said process cartridge includes:
• (ii-i) a photosensitive drum;
• (ii-ii) a rotatable developing roller for developing an electrostatic latent image formed on said photosensitive drum;
• (ii-iii) a developer supplying roller, provided in contact with said developing roller, for supplying developer to said developing roller;
• (ii-iv) a first driving force transmitting portion for transmitting a driving force to said developing roller, wherein said first driving force transmitting portion is fixed at an end portion of said developer supplying roller;
• (ii-v) a first driving force receiving portion for receiving the driving force from said first main assembly driving portion to rotate said developer supplying roller, wherein said driving force receiving portion is movable so that an axis of said first driving force receiving portion moves in a direction crossing an axis of said developing supplying roller;
• (ii-vi) a second driving force transmitting portion, fixed on an end portion of said developing roller and engaged with said first driving force transmitting portion, for transmitting the driving force from said first driving force transmitting portion to said developing roller;
• and
• (ii-vii) a second driving force receiving portion for receiving a driving force from said second main assembly driving portion to rotate said photosensitive drum, wherein said second driving force receiving portion is fixed at an end portion of said photosensitive drum,
• wherein a rotational direction of said developing roller is an opposite direction to a rotational direction of said developer supplying roller, and a surface speed of said developer supplying roller is larger than a surface speed of said developing roller.