Drum unit, cartridge and coupling member

A process cartridge comprising:

• a casing;
• a photosensitive drum rotatably supported by the casing;
• and
• toner contained in the casing;
• a developing roller configured to develop a latent image formed on the photosensitive drum with the toner;
• a coupling member operatively connected to the photosensitive drum, the coupling member being rotatable about a rotational axis thereof, the coupling member including (i) a cylindrical portion, (ii) a first projection at least partially positioned inside of the cylindrical portion, (iii) a second projection at least partially positioned inside of the cylindrical portion, and (iv) an aligner at least partially positioned inside of the cylindrical portion, the aligner including a surface that faces the rotational axis of the coupling member,
• wherein a distance between at least one of the first and second projections and the aligner is changeable,
• wherein, along a line perpendicular to the rotational axis of the coupling member, the first projection is open to the rotational axis of the coupling member, and
• wherein, along a line perpendicular to the rotational axis of the coupling member, the second projection is open to the rotational axis of the coupling member.

A drum unit for a cartridge, the drum unit comprising:

• a photosensitive drum;
• and
• a coupling member operatively connected to the photosensitive drum, the coupling member being rotatable about a rotational axis thereof, the coupling member including (i) a cylindrical portion, (ii) a first projection at least partially positioned inside of the cylindrical portion, (iii) a second projection at least partially positioned inside of the cylindrical portion, and (iv) an aligner at least partially positioned inside of the cylindrical portion, the aligner including a surface that faces the rotational axis of the coupling member,
• wherein a distance between at least one of the first and second projections and the aligner is changeable,
• wherein, along a line perpendicular to the rotational axis of the coupling member, the first projection is open to the rotational axis of the coupling member, and
• wherein, along a line perpendicular to the rotational axis of the coupling member, the second projection is open to the rotational axis of the coupling member.