US 11,720,049 B2
Developing cartridge including first cam rotatable with first gear and second cam rotatable with second gear to separate developing roller from photosensitive drum
Nao Itabashi, Nagoya (JP); Atsushi Fukaya, Toyohashi (JP); Naoya Kamimura, Ichinomiya (JP); Daisuke Maeta, Nagoya (JP); and Keigo Nakajima, Nagoya (JP)
Assigned to BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on May 16, 2022, as Appl. No. 17/745,159.
Claims priority of application No. 2021-102982 (JP), filed on Jun. 22, 2021.
Prior Publication US 2022/0404759 A1, Dec. 22, 2022
Int. Cl. G03G 21/16 (2006.01); G03G 21/18 (2006.01)
CPC G03G 21/1647 (2013.01) [G03G 21/1676 (2013.01); G03G 21/1821 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A developing cartridge attachable to a drum cartridge including a photosensitive drum, the developing cartridge comprising:
a developing roller rotatable about a developing axis extending in a first direction;
a casing configured to accommodate developing agent therein, the casing having one end in a second direction where the developing roller is positioned;
a first cam rotatable relative to the casing about a first axis extending in the first direction between a first position and a second position;
a first gear rotatable about the first axis together with the first cam;
a second cam rotatable relative to the casing about a second axis extending in the first direction between a third position and a fourth position; and
a second gear rotatable about the second axis together with the second cam, the second gear being in contact with the first gear,
wherein, in a state where the developing cartridge is attached to the drum cartridge,
in a case where the first cam is at the first position,
the second cam is at the third position to cause a surface of the developing roller and a surface of the photosensitive drum to contact each other, and
wherein, in the state where the developing cartridge is attached to the drum cartridge,
in a case where the first cam is at the second position,
the second cam is at the fourth position to make contact with a part of the drum cartridge such that the developing cartridge moves relative to the drum cartridge in a direction to separate the surface of the developing roller from the surface of the photosensitive drum in such a manner that a point of contact between the second cam and the part of the drum cartridge functions as a fulcrum.