Cartridge Detection

A cartridge comprising:

• a housing;
• a driving input member provided at the housing, the driving input member configured to be rotated by an externally supplied rotation driving force;
• a rotational member configured to receive the rotation driving force, which is transmitted from the driving input member, and be rotated thereby;
• a detection protrusion including an elastic body and which is disposed at a position away from a rotational center of the rotational member, the detection protrusion protruding from the rotational member away from the housing;
• and
• a cover attached to the housing, the cover having an opposite part that faces a portion of the rotational member from which the detection protrusion protrudes,
• wherein, at an initial position, which is a position before the rotational member is rotated, the detection protrusion abuts the opposite part of the cover and wherein the opposite part of the cover is configured to elastically deform the detection protrusion when the detection protrusion is positioned in a state in which the detection protrusion abuts the opposite part of the cover.