Patent ID: 11947277
Assignee: BROTHER KOGYO KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An image forming apparatus comprising:
a main body casing having an opening and a slot extending from the opening toward an inside of the main body casing along a first direction, 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 and when the cover is in the closed position, the main body casing having an inner surface positioned at an innermost of the slot;
a drum cartridge including a photosensitive drum rotatable about a first axis extending in the first direction, the drum cartridge being removably insertable into the slot through the opening in the first direction; and
a developing cartridge including a developing roller rotatable about a second axis extending in the first direction, the developing cartridge being removably insertable into the slot through the opening in the first direction,
wherein the drum cartridge includes a first drum side wall and a second drum side wall faced to the first drum side wall in the first direction when the drum cartridge is attached to the slot and spaced from the first drum side wall in the first direction when the drum cartridge is attached to the slot, the first drum side wall is farther from the opening than the second drum side wall is from the opening in the first direction when the drum cartridge is attached to the slot,
wherein one of the inner surface of the main body casing and the first drum side wall of the drum cartridge includes a first hole,
wherein the other of the inner surface of the main body casing and the first drum side wall of the drum cartridge includes a first protrusion engaging with the first hole when the drum cartridge is attached to the slot, and;
wherein the main body casing includes a drum guide groove configured to guide movement of the drum cartridge, and the drum guide groove extends in the first direction, and
wherein the drum guide groove has a tapered shape.