US 12,271,145 B2
Image forming apparatus
Masao Ichiyanagi, Ama (JP); and Keita Shimizu, Nagoya (JP)
Assigned to BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on Apr. 23, 2024, as Appl. No. 18/642,964.
Application 18/642,964 is a continuation of application No. 18/332,064, filed on Jun. 9, 2023, granted, now 11,994,825.
Application 18/332,064 is a continuation of application No. 17/820,308, filed on Aug. 17, 2022, granted, now 11,714,379, issued on Aug. 1, 2023.
Application 17/820,308 is a continuation of application No. 17/492,072, filed on Oct. 1, 2021, granted, now 11,448,999, issued on Sep. 20, 2022.
Application 17/492,072 is a continuation of application No. 16/800,487, filed on Feb. 25, 2020, granted, now 11,150,600, issued on Oct. 19, 2021.
Application 16/800,487 is a continuation of application No. PCT/JP2019/022499, filed on Jun. 6, 2019.
Claims priority of application No. 2018-184046 (JP), filed on Sep. 28, 2018.
Prior Publication US 2024/0272581 A1, Aug. 15, 2024
Int. Cl. G03G 21/16 (2006.01); G03G 15/00 (2006.01)
CPC G03G 21/1676 (2013.01) [G03G 15/751 (2013.01); G03G 21/1633 (2013.01); G03G 2221/163 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a drum cartridge including a photosensitive drum rotatable about a first axis extending in an axial direction;
a developing cartridge including a developing roller rotatable about a second axis extending in the axial direction and a developing casing configured to accommodate toner;
a main body casing having a slot extending in the axial direction, the slot allowing attachment and detachment of the drum cartridge in the axial direction and allowing attachment and detachment of the developing cartridge in the axial direction; and
a first inner surface located inside the slot; and
a second inner surface located inside the slot and spaced away from the first inner surface in the axial direction;
wherein the developing casing further includes:
a first contact surface configured to come into contact with the first inner surface when the developing cartridge is attached in the slot in a state where the drum cartridge is attached in the slot; and
a second contact surface configured to come into contact with the second inner surface when the developing cartridge is attached in the slot in a state where the drum cartridge is attached in the slot;
wherein in a state in which the drum cartridge is attached in the slot and the developing cartridge is detached from the slot, the first inner surface is located farther from the photosensitive drum than the second inner surface, and
wherein in a state in which the developing cartridge is detached from the slot, the first contact surface is located farther from the developing roller than the second contact surface.