Drum unit, cartridge and coupling member

A cartridge comprising:

• a casing;
• a cylindrical photosensitive drum having an axis L1, the photosensitive drum being rotatably supported by the casing;
• and
• a coupling member operatively connected to the photosensitive drum, the coupling member including:
• (i) a drum flange provided at an end of the photosensitive drum, a part of the drum flange being positioned inside of the photosensitive drum, and
• (ii) a connecting part operatively connected to the drum flange, the connecting part including:
• (ii-i) a cap positioned adjacent to the drum flange,
• (ii-ii) an arm portion extending from the cap in a direction of the axis L1, and
• (ii-iii) a projection projecting from the arm portion in a direction perpendicular to and toward the axis L1 such that at least a part of the projection is closer to the axis L1 than the arm portion is to the axis L1, with at least a part of a surface of the projection facing the axis L1,
• wherein the arm and the projection are movable relative to the drum flange and the cap.

A process cartridge comprising:

• a casing;
• toner contained in the casing;
• a cylindrical photosensitive drum having an axis L1, the photosensitive drum being rotatably supported by the casing;
• a developing roller configured to develop a latent image formed on a surface the photosensitive drum with the toner;
• and
• a coupling member operatively connected to the photosensitive drum, the coupling member including:
• (i) a drum flange provided at an end of the photosensitive drum, a part of the drum flange being positioned inside of the photosensitive drum, and
• (ii) a connecting part operatively connected to the drum flange, the connecting part including:
• (ii-i) a cap positioned adjacent to the drum flange,
• (ii-ii) an arm portion extending from the cap in a direction of the axis L1, and
• (ii-iii) a projection projecting from the arm portion in a direction perpendicular to and toward the axis L1 such that at least a part of the projection is closer to the axis L1 than the arm portion is to the axis L1, with at least a part of a surface of the projection facing the axis L1
• wherein the arm and the projection are movable relative to the drum flange and the cap.