Process cartridge, photosensitive drum unit, developing unit and electrophotographic image forming apparatus

A photosensitive drum unit detachably mountable to a main assembly of an electrophotographic image forming apparatus, wherein the main assembly includes a rotatable main assembly side engaging member having a recess and a rotational force applying portion provided in the recess, said photosensitive drum unit comprising:

• a photosensitive drum having a rotational axis substantially perpendicular to a mounting and demounting direction of said photosensitive drum unit;
• a cylindrical rotational force transmitted member for receiving a rotational force for rotating said photosensitive drum;
• and
• a coupling member held inside said cylindrical rotational force transmitted member and including (i) a rotational force receiving portion for receiving the rotational force from the rotational force applying portion and (ii) a rotational force transmitting portion for transmitting the rotational force to said cylindrical rotational force transmitted member,
• wherein said coupling member enters the recess of the rotatable main assembly side engaging member in a state that said photosensitive drum unit is mounted to the main assembly, and
• wherein said coupling member is inclinable and translatable relative to a rotational axis of said rotational force transmitted member to disengage from the rotatable main assembly side engaging member when said photosensitive drum unit is dismounted from the main assembly.

A developing unit detachably mountable to a main assembly of an electrophotographic image forming apparatus, wherein the main assembly includes a rotatable main assembly side engaging member having a recess and a rotational force applying portion provided in the recess, said process cartridge comprising:

• a developing roller having a rotational axis substantially perpendicular to a mounting and demounting direction of said developing unit;
• a cylindrical rotational force transmitted member for receiving a rotational force for rotating said developing roller;
• and
• a coupling member held inside said cylindrical rotational force transmitted member and including (i) a rotational force receiving portion for receiving the rotational force from the rotational force applying portion and (ii) a rotational force transmitting portion for transmitting the rotational force to said cylindrical rotational force transmitted member,
• wherein said coupling member enters the recess of the rotatable main assembly side engaging member in a state that said developing unit is mounted to the main assembly, and
• wherein said coupling member is inclinable and translatable relative to a rotational axis of said rotational force transmitted member to disengage from the rotatable main assembly side engaging member when said developing unit is dismounted from the main assembly.

An electrophotographic image forming apparatus comprising:

• a main assembly including a rotatable main assembly side engaging member having a recess and a rotational force applying portion provided in the recess;
• and
• a process cartridge including:
• a photosensitive drum having a rotational axis substantially perpendicular to a mounting and demounting direction of said process cartridge;
• process means actable on said photosensitive drum;
• a cylindrical rotational force transmitted member for receiving a rotational force for rotating said photosensitive drum;
• and
• a coupling member held inside said rotational force transmitted member and including (i) a rotational force receiving portion for receiving the rotational force from the rotational force applying portion and (ii) a rotational force transmitting portion for transmitting the rotational force to said cylindrical rotational force transmitted member,
• wherein said coupling member enters the recess of said rotatable main assembly side engaging member in a state that said process cartridge is mounted to said main assembly, and
• wherein said coupling member is inclinable and translatable relative to a rotational axis of said rotational force transmitted member to disengage from said main assembly side engaging member when said process cartridge is dismounted from said main assembly.