Developer unit and image formation device

摘要

A developing unit and image formation device in which a developer carrier is reliably pressed towards and separated from an image carrier is described. A separation and pressing mechanism is provided for separating and pressing the developer carriers of developing cartridges installed in a drum unit onto image carriers. This separation and pressing mechanism has a pair of direct cam members. Each direct cam member has a release action portion that engages with the releasing projection of a developing cartridge when the developer carrier is to be separated from the image carrier. Each direct cam member may also have a pressing action portion that engages with the pressing projection of the developing cartridges when the developer carrier is to be pressed onto the image carrier.

主权项

1. A developing cartridge comprising:
a housing configured to accommodate developer therein; a developing roller extending in an extending direction; a housing projection projecting in the extending direction, the housing projection provided an end portion of the housing in the extending direction; a plate provided at an outer surface of the housing, the plate configured to pivot with respect to an outer surface of the housing about an axis extending in the extending direction; and a plate projection projecting in the extending direction, the plate projection provided an end portion of the plate in the extending direction.