Cartridge, mounting method for coupling member, and disassembling method for coupling member

A cartridge comprising:

• a first rotatable member rotatable about an axis thereof;
• a second rotatable member rotatable about an axis thereof;
• a coupling member for receiving a rotational force for rotating the first rotatable member and the second rotatable member;
• a cylindrical member of resin material movably supporting one end portion of the coupling member inside of the cylindrical member;
• a cylindrical member side force receiving portion of resin material, provided inside the cylindrical member, for receiving the rotational force from the coupling member;
• a first gear, provided on outer periphery of the cylindrical member, for transmitting the rotational force received by the cylindrical member side force receiving portion to the first rotatable member;
• a second gear, provided on an outer periphery of the cylindrical member, for transmitting the rotational force received by the cylindrical member side force receiving portion to the second rotatable member;
• a first regulating portion, provided inside of the cylindrical member, for preventing the one end portion of the coupling member from disengaging in an axial direction of the cylindrical member, wherein the first regulating portion is deformable outwardly in a radial direction of the cylindrical member to allow the one end portion of the coupling member to disengage in the axial direction of the cylindrical member, wherein the first regulating portion is provided at each of a plurality of positions along a circumferential direction of the cylindrical member with intervals in the circumferential direction;
• a first bearing member supporting the first rotatable member at one longitudinal end portion of the first rotatable member and supporting the second rotatable member at one longitudinal end portion of the second rotatable member;
• a second bearing member supporting the first rotatable member at the other longitudinal end portion of the first rotatable member and supporting the second rotatable member at the other longitudinal end portion of the second rotatable member;
• and
• a side cover covering the cylindrical member so as to permit rotation of the cylindrical member in a state of being connected with the bearing member,
• wherein the side cover includes a second regulating portion, and the second regulating portion enters at least one gap between the inner surface of the cylindrical member and the first regulating portion so as to regulate deformation of the first regulating portion outward of the cylindrical member in the radial direction in a state in which the one end portion of the coupling member is mounted to the inside of the cylindrical member.