Patent ID: 8583009

Claim:
A developing cartridge which is detachably mountable in an apparatus main body of an image forming apparatus, 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; a receiving member provided at 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 configured to couple with a driving force output member provided in the apparatus main body to receive a driving force from the driving force output member; a developing roller held 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; a detected rotary member provided at 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 detected portion and a second detected portion which is provided away from the first detected portion in a rotational direction about the third axis, the detected rotary member configured to rotate by the driving force received by the receiving member from a first rotational position where the first detected portion is detected by a detection member provided in the apparatus main body to a second rotational position where the second detected portion is detected by the detection member, wherein the second detected portion is disposed at a substantially opposite side relative to the first detected portion in relation to the third axis; and a cut-off mechanism configured to cut off a transmission of the driving force from the receiving member to the detected rotary member in a state where the detected rotary member is positioned in the second rotational position.