Electrophotographic photosensitive drum, process cartridge, and electrophotographic image forming apparatus

An electrophotographic photosensitive drum usable with an electrophotographic image forming apparatus, comprising:

• a non-circular twisted projection having a cross-section with a plurality of corner portions, said non-circular twisted projection being provided at one longitudinal end of said electrophotographic photosensitive drum, and being engageable with a non-circular twisted hole having a cross-section with a plurality of corner portions, the non-circular twisted hole being disposed at a central portion of a driving rotatable member of a main assembly of the image forming apparatus;
• and
• a drum electroconductive member provided on said projection and being electrically connected with said electrophotographic photosensitive drum, said drum electroconductive member being contactable with a main-assembly electroconductive member electrically connected with the main assembly of the image forming apparatus, the main-assembly electroconductive member being disposed in the hole to ground said electrophotographic photosensitive drum,
• wherein while said projection is in engagement with the hole and is being rotated, said main-assembly electroconductive member and said drum electroconductive member are integrally rotated while being in contact with each other.

A process cartridge detachably mountable to an electrophotographic image forming apparatus, said process cartridge comprising:

• an electrophotographic photosensitive drum;
• a non-circular twisted projection having a cross-section with a plurality of corner portions, said non-circular twisted projection being provided at one longitudinal end of said electrophotographic photosensitive drum, and being engageable with a non-circular twisted hole having a cross-section with a plurality of corner portions, the non-circular twisted hole being disposed at a central portion of a driving rotatable member of a main assembly of the image forming apparatus;
• and
• a drum electroconductive member provided on said projection and being electrically connected with said electrophotographic photosensitive drum, said drum electroconductive member being contactable with a main-assembly electroconductive member electrically connected with the main assembly of the image forming apparatus, the main-assembly electroconductive member being disposed in the hole to ground said electrophotographic photosensitive drum,
• wherein a contact position between said main-assembly electroconductive member and said drum electroconductive member moves in interrelation with said projection being moved toward the hole by rotation of the driving rotatable member when said projection is engaged with the hole of the driving rotatable member.

A process cartridge detachably mountable to an electrophotographic image forming apparatus, said process cartridge comprising:

• an electrophotographic photosensitive drum;
• a non-circular twisted projection having a cross-section with a plurality of corner portions, said non-circular twisted projection being provided at one longitudinal end of said electrophotographic photosensitive drum, and being engageable with a non-circular twisted hole having a cross-section with a plurality of corner portions, the non-circular twisted hole being disposed at a central portion of a driving rotatable member of a main assembly of the image forming apparatus;
• and
• a drum electroconductive member provided on said projection and being electrically connected with said electrophotographic photosensitive drum, said drum electroconductive member being contactable with a main-assembly electroconductive member electrically connected with the main assembly of the image forming apparatus, the main-assembly electroconductive member being disposed in the hole to ground said electrophotographic photosensitive drum,
• wherein while said projection engages the hole and is being rotated, said main-assembly electroconductive member and said drum electroconductive member are integrally rotated while being in contact with each other.

An electrophotographic image forming apparatus to which a process cartridge is detachably mountable comprising:

• (i) a rotatable drive member;
• (ii) a non-circular twisted hole having a cross-section with a plurality of corner portions, said non-circular twisted hole being provided at a central portion of said rotational drive member;
• (iii) a first electroconductive member electrically connected with a main assembly of said image forming apparatus;
• (iv) a process cartridge detachably mountable to a cartridge mounting portion, said process cartridge including:
• an electrophotographic photosensitive drum;
• a non-circular twisted projection having a cross-section with a plurality of corner portions, said non-circular twisted projection being provided at one longitudinal end of said electrophotographic photosensitive drum, and being engageable with said non-circular twisted hole;
• and
• a second electroconductive member provided on said projection and being electrically connected with said electrophotographic photosensitive drum, said drum electroconductive member being contactable with said first electroconductive member to ground said electrophotographic photosensitive drum,
• wherein a contact position between said second electroconductive member and said first electroconductive member moves in interrelation with said projection being moved toward said hole by rotation of said rotatable drive member when said projection is engaged with said hole.

An electrophotographic image forming apparatus to which a process cartridge is detachably mountable, comprising:

• (i) a rotational drive member;
• (ii) a non-circular twisted hole having a cross-section with a plurality of corner portions, said non-circular twisted hole being provided at a central portion of said rotational drive member;
• (iii) a first electroconductive member electrically connected with a main assembly of said image forming apparatus, said first electroconductive member being disposed in said hole;
• and
• (iv) a process cartridge detachably mountable to a cartridge mounting portion of said image-forming apparatus, said process cartridge including:
• an electrophotographic photosensitive drum;
• a non-circular twisted projection having a cross-section with a plurality of corner portions,
• said non-circular twisted projection being provided at one longitudinal end of said electrophotographic photosensitive drum, and being engageable with said non-circular twisted hole, and
• a second electroconductive member contactable with said first electroconductive member to electrically ground said electrophotographic photosensitive drum, said second electroconductive member being provided on said projection and being electrically connected with said electrophotographic photosensitive drum,
• wherein while said projection is in engagement with said hole and is being rotated, said second electroconductive member and said first electroconductive member are integrally rotated while being in contact with each other.