Cartridge and Image Forming Apparatus Provided Therewith

An image forming apparatus comprising:

• a main casing;
• and
• a cartridge detachable from and attachable to the main casing,
• the cartridge comprising:
• a frame defining an internal space for accommodating therein developing agent, the frame being formed with a filling port for filling the internal space with the developing agent therethrough;
• a rotation body having a rotation axis extending in a predetermined direction, the rotation body being provided at the frame and rotatable about the rotation axis relative to the frame;
• a driving force transmission unit provided at the frame and configured to transmit a driving force from the main casing to the rotation body;
• a closing member configured to close the filling port;
• and
• a moving member configured to be irreversibly moved to one of a covered position and an exposed position by the driving force transmitted through the driving force transmission unit, the moving member covering at least a portion of the closing member when the moving member is at the covered position, the moving member exposing the closing member when the moving member is at the exposed position, the exposed position providing an exposing degree greater than that at the covered position,
• the main casing comprising:
• a detection unit configured to detect a movement of the moving member;
• and
• a judgment unit configured to judge a condition of the cartridge based on a detection of the detection unit.