Developing cartridge

A developing cartridge comprising:

• a housing including a first side wall and a second side wall which are provided to oppose each other, the housing configured to accommodate developer therein;
• a receiving member provided on an outer side of the first side wall to be rotatable about a first axis which extends in an opposing direction of the first side wall and the second side wall, the receiving member including a surface configured to receive an external driving force;
• a developing roller provided between the first side wall and the second side wall to be rotatable about a second axis which extends in parallel to the first axis with a space therebetween, the developing roller configured to rotate by the driving force received by the receiving member;
• and
• a rotary member provided on the outer side of the first side wall to be rotatable about a third axis which extends in parallel to the first axis with a space therebetween, and including a first portion to be detected by a detection member, and a second portion which is provided away from the first portion in a rotational direction about the third axis, the rotary member configured to be rotated from a retreat position to an initial position by the second portion receiving an external force different from the external driving force, the initial position being where the detectable rotary member is rotated by the driving force received by the receiving member, the retreat position being where a transmission of the driving force from the receiving member to the rotary member is cut off.

A developing cartridge which is detachably mountable in an apparatus main body of an image forming apparatus, the apparatus main body including a driving force output member, and an interference member provided therein, the developing cartridge comprising:

• a housing including a first side wall and a second side wall which are provided to oppose each other, the housing configured to accommodate developer therein;
• an input gear provided on an outer side of the first side wall to be rotatable about an input gear axis which extends in an opposing direction of the first side wall and the second side wall, the input gear configured to couple with the driving force output member to receive a driving force from the driving force output member;
• a developing gear provided on the outer side of the first side wall to be rotatable about a developing gear axis which extends in parallel to the input gear axis with a space therebetween, the developing gear configured to mesh with the input gear;
• a first intermediate gear provided on the outer side of the first side wall to be rotatable about a first intermediate gear axis which extends in parallel to the input gear with a space therebetween, the first intermediate gear configured to mesh with the input gear;
• a second intermediate gear provided on the outer side of the first side wall to be rotatable about a second intermediate gear axis which extends in parallel to the input gear axis with a space therebetween, and including a first engagement portion, the second intermediate gear configured to mesh with the first intermediate gear;
• a detectable rotary member provided on the outer side of the first side wall to be rotatable about a rotary member axis which extends in parallel to the input gear axis with a space therebetween, the detectable rotary member including a second engagement portion provided such that a rotating locus drawn by the second engagement portion when the detectable rotary member rotates partly overlap a rotating locus drawn by the first engagement portion when the second intermediate gear rotes, the detectable rotary member configured to rotate from a retreat position to an initial position by contacting the interference member in a process of mounting the developing cartridge into the apparatus main body, the retreat position being where the second engagement portion is provided outside the rotating locus of the first engagement portion, the initial position being where the second engagement portion is provided on the rotating locus of the first engagement portion.