US 12,298,701 B2
Image forming apparatus
Daisuke Ishizuka, Nagoya (JP); Atsushi Ozawa, Aichi-gun (JP); and Hideshi Nishiyama, Owariasahi (JP)
Assigned to BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on Mar. 10, 2023, as Appl. No. 18/181,856.
Application 18/181,856 is a continuation of application No. 17/238,900, filed on Apr. 23, 2021, granted, now 11,635,726.
Application 17/238,900 is a continuation of application No. 16/782,215, filed on Feb. 5, 2020, granted, now 11,003,128, issued on May 11, 2021.
Claims priority of application No. 2019-042331 (JP), filed on Mar. 8, 2019.
Prior Publication US 2023/0213885 A1, Jul. 6, 2023
Int. Cl. G03G 21/16 (2006.01)
CPC G03G 21/1642 (2013.01) [G03G 21/1633 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a main body casing having an opening, the main body casing including a cover movable between an open position in which the cover does not cover the opening and a closed position in which the cover covers the opening;
a drum cartridge including a photosensitive drum rotatable about a first axis extending in a first direction;
a developing unit including a developing roller rotatable about a second axis extending in the first direction; and
an intermediate transfer belt positioned above the drum cartridge and the developing unit in a state where the drum cartridge is attached to the main body casing,
a movable cam moveable among an insertion position when the cover is at the open position, an attached position, and a third position when the cover is at the closed position, the attached position being intermediate between the insertion position and the third position,
wherein, in a case where the cover is at the open position, the developing roller is at a first developing position spaced from the photosensitive drum,
wherein in a case where the cover moves to the closed position from the open position, the developing roller is moved toward the photosensitive drum from the first developing position,
wherein in a case where the movable cam is at the insertion position, the photosensitive drum is at a first drum position and the developing roller is at the first developing position,
wherein in a case where the movable cam is at the insertion position, the photosensitive drum is moved toward the intermediate transfer belt from the first drum position, and
wherein in a case where the cam is in the third position, the developing roller is moved toward the photosensitive drum from the first developing position.