Process cartridge and electrophotographic image forming apparatus

A process cartridge comprising:

• a frame;
• a photosensitive drum supported by the frame, the photosensitive drum being rotatable about an axis thereof, the photosensitive including (i) a first end and (ii) a second end opposite to the first end;
• a developing roller supported by the frame, the developing roller being rotatable about an axis thereof;
• a coupling operatively connected to the photosensitive drum, the coupling being rotatable about an axis thereof, the coupling being positioned (i) at the first end of the photosensitive drum, (ii) coaxial with the photosensitive drum, and (iii) at a side of the process cartridge, and the coupling including a projection;
• a helical gear positioned at the side of the process cartridge, the helical gear being rotatable about an axis thereof, the helical gear having a plurality of teeth, with at least some of the teeth being exposed teeth that are uncovered by the frame and exposed to outside of the process cartridge, and with a tip of at least one of the exposed teeth facing the axis of the photosensitive drum;
• and
• a stopper positioned at the side of the process cartridge, the stopper having a surface extending in an axial direction of the photosensitive drum and facing the axis of the photosensitive drum,
• wherein, as measured in an axial direction of the photosensitive drum, at least a part of the exposed teeth of the helical gear is positioned farther from the second end of the photosensitive drum than a tip of the projection of the coupling is positioned from the second end of the photosensitive drum.

A process cartridge comprising:

• a frame;
• a photosensitive drum supported by the frame, the photosensitive drum being rotatable about an axis thereof, the photosensitive including (i) a first end and (ii) a second end opposite to the first end;
• a developing roller supported by the frame, the developing roller being rotatable about an axis thereof;
• a coupling operatively connected to the photosensitive drum, the coupling being rotatable about an axis thereof, the coupling being positioned (i) at the first end of the photosensitive drum, (ii) coaxial with the photosensitive drum, and (iii) at a side of the process cartridge, and the coupling including a projection;
• a helical gear positioned at the side of the process cartridge, the helical gear being rotatable about an axis thereof, the helical gear having a plurality of teeth, with at least some of the teeth being exposed teeth that are uncovered by the frame and exposed to outside of the process cartridge, and with a tip of at least one of the exposed teeth facing the axis of the photosensitive drum;
• and
• a stopper positioned at the side of the process cartridge, the stopper having a surface extending in an axial direction of the photosensitive drum and facing the axis of the photosensitive drum,
• wherein, as measured in an axial direction of the photosensitive drum, at least a part of the exposed teeth of the helical gear is positioned farther from the second end of the photosensitive drum than a tip of the projection of the coupling is positioned from the second end of the photosensitive drum, and
• wherein, as measured along a line perpendicular to the axis of the photosensitive drum, a shortest distance from the axis of the photosensitive drum to a tip of one of the plurality of teeth is 90% to 110% of a length of a radius of the photosensitive drum.