Abstract: Image forming apparatus includes a photoconductive drum cartridge which has an opening through which toner is applied to an electrostatic image formed on the photoconductive drum. To provide more than one color, a development device includes four toning units which are indexible into alignment with the toning opening in the cartridge. Each toning unit includes an applicator assembly at the top of the unit which is movable with respect to the rest of the unit toward the toning opening. A resilient lift mechanism engages a pair of ledges at opposite ends of the applicator assembly and is actuatable to move the applicator assembly toward the toning opening. A sensor senses arrival of each toning unit in a position aligned with the toning opening. A logic and control in response to a signal from the sensor rotates a cam member which is resiliently coupled to the pins for moving the applicator assembly.

Abstract: A toner monitor mount holds a toner monitor for engagement by each of a plurality of toner stations. To assure intimate contact between a monitor and an engaging wall of each of the stations, the mount includes a spring which urges the monitor against the engaging wall. The mount permits rotational movement of the monitor about an axis parallel to movement of the stations and an axis across the movement of the stations to assure repeating intimate contact of the monitor with the engaging wall of the stations.

Abstract: An image forming apparatus includes an image member supplied to the apparatus in an image member cartridge and a transfer member which engages the image member through an access opening in the cartridge. The transfer member is driven by a motor in the image forming apparatus and in turn drives the image member in the cartridge, eliminating the need for a separate driving connection between the image forming apparatus and the image member.