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:
• a first member including a cylindrical portion, a part of the first member being positioned inside of the photosensitive drum and a part first member being positioned outside of the photosensitive drum, and
• a second member operatively connected to first member, the second member including (i) a plurality of arm portions that are movable relative to the first member, and (ii) a projection projecting from each of the arm portions in a direction perpendicular to and toward the axis L1 such that at least a part of each projection is closer to the axis L1 than each of the arm portions is to the axis L1, with at least a part of a surface of each projection facing the axis L1, and with at least a part of each of the arm portions being positioned inside of the photosensitive drum and inside of the first member.

A process cartridge comprising:

• casing:
• toner contained in the casing;
• a cylindrical photosensitive drum having an axis L1;
• a developing roller configured to develop a latent image on a surface of the photosensitive drum with the toner;
• and
• a coupling member operatively connected to the photosensitive drum, the coupling member including:
• a first member including a cylindrical portion, a part of the first member being positioned inside of the photosensitive drum and a part first member being positioned outside of the photosensitive drum, and
• a second member operatively connected to first member, the second member including (i) a plurality of arm portions that are movable relative to the first member, and (ii) a projection projecting from each of the arm portions in a direction perpendicular to and toward the axis L1 such that at least a part of each projection is closer to the axis L1 than each of the arm portions is to the axis L1, with at least a part of a surface of each projection facing the axis L1, and with at least a part of each of the arm portions being positioned inside of the photosensitive drum and inside of the first member.