Positional control features between replaceable units of an electrophotographic image forming device

A replaceable unit for an image forming device, comprising:

• a frame having a generally rectangular bottom plate and a first and a second end plate attached adjacent to respective first and second ends of the bottom plate, the first and second end plates rotatably supporting therebetween a shaft axially extending from each end of a photoconductive drum and centered on the rotational axis of the photoconductive drum;
• a top surface of the bottom plate including a first support member and a second support member positioned inward from the first and second end plates, respectively, a top planar surface of the second support member being a first datum surface and rotational stop for a detachable unit insertable between the first and second end plates;
• a first and a second end cap removably attached to the respective first and second end plate, each end cap having a multiplicity of alignment features axially projecting from an outer surface thereof;
• the first and second end plates having a C-shaped mounting channel aligned with one another, the mounting channel in the first end plate having a deskewing plug positioned adjacent an internal end thereof and the mounting channel in the second end plate having a plurality of datum surfaces formed therein, the first and second mounting channels each sized to receive a first and a second positioning bearing, respectively, mounted on a shaft of a roll rotatably mounted on the detachable unit, the first positioning bearing engaging with the deskewing plug and the second positioning bearing engaging with the plurality of datum surfaces when the detachable unit is attached to the replaceable unit;
• and,
• a first spring-biased latch and a second spring-biased latch each pivotally mounted adjacent a respective mouth of the first and second mounting channels, the first and second spring-biased latches engageable with the first and second positioning bearings, respectively, wherein, each of the spring-biased latches of the first and second end caps when engaged applies a force to the first and second positioning bearings, respectively, to hold the first and second positioning bearings in contact with the deskewing plug and the plurality of datum surfaces, respectively.