Electrophotographic image forming apparatus, cartridge and drum unit

A cartridge comprising:

• a casing;
• a photosensitive drum supported by the casing, the photosensitive drum being rotatable in a rotational direction about a rotational axis;
• and
• a coupling operatively connected to the photosensitive drum so as to be capable of transmitting a driving force to the photosensitive drum, the coupling being rotatable in the rotational direction about the rotational axis, the coupling including:
• a first projecting surface that extends in a direction away from the photosensitive,
• a second projecting surface that is downstream of the first projecting surface in the rotational direction, the second projecting surface extending in a direction that is away from the photosensitive drum,
• an inclined portion at least a part of which extends about the rotational axis and in the rotational direction between a position upstream of the first projecting surface in the rotational direction to a position adjacent to the first projecting surface, and
• a third projecting surface projecting outwardly in a direction perpendicular to the rotational axis,
• wherein the inclined portion is inclined such that a distance in the direction of the rotational axis from an end of the photosensitive drum to the inclined portion decreases along the inclined portion in the rotational direction,
• wherein a distance, measured along a line that is perpendicular to the rotational axis, from the rotational axis to at least a part of the inclined portion that is upstream of the first projecting surface is less than a distance, measured along a line that is perpendicular to the rotational axis, from the rotational axis to a part of the first projecting surface that is farthest from the rotational axis, and
• wherein the third projecting surface (i) covers a space downstream of the second projecting surface in the rotational direction or (ii) covers a space upstream of the inclined portion in the rotational direction.

A cartridge comprising:

• a casing;
• a photosensitive drum supported by the casing, the photosensitive drum being rotatable in a rotational direction about a rotational axis;
• and
• a coupling operatively connected to the photosensitive drum so as to be capable of transmitting a driving force to the photosensitive drum, the coupling being rotatable in the rotational direction about the rotational axis, the coupling including:
• a first surface configured to receive the driving force, the first surface extending in a direction away from the photosensitive drum,
• a second surface configured to receive a braking force that opposes the driving force, the second surface being positioned downstream of the first surface in the rotational direction, the second surface extending in a direction away from the photosensitive drum, an inclined portion at least a part of which extends about the rotational axis between a position upstream of the first surface in the rotational direction to a position adjacent to the first surface in the rotational direction, and
• a visor surface projecting outwardly in a direction perpendicular to the rotational axis,
• wherein the inclined portion is inclined such that a distance from an end of the photosensitive drum to the inclined portion in the direction of the rotational axis decreases along the inclined portion in the rotational direction,
• wherein a distance, measured along a line that is perpendicular to the rotational axis, from the rotational axis to at least a part of the inclined portion that is upstream of the first surface is less than a distance, measured along a line that is perpendicular to the rotational axis, from the rotational axis to a part of the second surface that is farthest from the rotational axis, and
• wherein the visor surface covers (i) a space downstream of the second surface in the rotational direction or (ii) a space upstream of the inclined portion in the rotational direction.