Patent ID: 11899393
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A cartridge comprising:
a developing unit including a developing roller and a developing frame supporting the developing roller, the developing frame including a first receiving surface;
a drum unit to which the developing unit is detachably attached, the drum unit including
a photosensitive drum being rotatable about a rotation axis which extends in a first direction,
a transfer roller contacting the photosensitive drum,
a corona charger for charging the photosensitive drum,
a drum frame supporting the photosensitive drum, the drum frame including (i) a first side wall extending in a direction crossing the first direction, (ii) a second side wall extending in a direction crossing the first direction, (iii) a bottom portion connecting the first side wall and the second side wall, and (iv) a support projection projecting from the bottom portion, wherein the first side wall, the second side wall and the support projection support the developing unit, and are disposed such that the developing unit is disposed between the first side wall and the second side wall in the first direction,
a first pressing member,
a first compression spring pressing the first pressing member against the first receiving surface such that the developing roller is pressed against the photosensitive drum, the first compression spring including (i) a first received end being received by the first pressing member so as to press the first pressing member and (ii) a second received end opposite to the first received end and being received by the drum frame,
a lifting lever configured to move the developing unit in a removal direction from the drum unit, the lifting lever including a surface on which projections are provided,

wherein in a state where the drum unit is placed on a horizontal plane so that the surface faces upward, at least one of the projections is further from the photosensitive drum than the first received end is in a second direction orthogonal to the first direction and parallel to a horizontal direction, one end of the lifting lever is closer to the photosensitive drum than the first pressing member is in the second direction, and the one end of the lifting lever is closer to the photosensitive drum than the support projection is in the second direction, and
wherein in the state where the drum unit is placed on the horizontal plane so that the surface faces upward, a distance between the one end of the lifting lever and the first pressing member is longer than a distance between the other end of the lifting lever in the second direction.