| 主权项 |
1. 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 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; a first 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, the first rotary member configured to rotate by the driving force received by the receiving member; a second rotary member provided at the outer side of the first side wall to be rotatable about a fourth axis which extends in parallel to the third axis with a space therebetween, the second rotary member configured to take a driven position where the second rotary member rotates by the driving force transmitted from the first rotary member and a non-driven position where the transmission of the driving force from the first rotary member is cut off; a detected member provided at the outer side of the first side wall and configured to move in association with the rotation of the second rotary member and function as a detection target to be detected by a detection member provided in the apparatus main body; and a first engagement portion provided at the outer side of the first side wall in a position separated from a fifth axis which extends in parallel to the first axis with a space therebetween, the first engagement portion configured to rotate about the fifth axis by the driving force received by the receiving member, wherein the second rotary member includes a second engagement portion which is provided in a position separated from the fourth axis, wherein when the second rotary member is in the non-driven position, the second engagement portion is provided on a rotating locus drawn by the first engagement portion, and wherein the first engagement portion is configured to engage with the second engagement portion as the first engagement portion rotates after the first rotary member has rotated for a predetermined amount, so that the second engagement portion moves rotationally about the fourth axis by a force received from the first engagement portion, whereby the second rotary member rotates from the non-driven position to the driven position. |
