Abstract: The invention relates to a process cartridge for an image forming apparatus, wherein the cartridge includes frame and a removable toner hopper that is connected to the frame by a screw. The use of a screw as the means for attaching the hopper to the cartridge frame simplifies assembly and remanufacture/refilling of the cartridge.

Abstract: A bearing is provided at each longitudinal end of the cartridge frame. The bearing has mounting apertures for mounting the developing roller and regulating blade, and for maintaining a predetermined spacing between the developing roller and the regulating blade. The bearing is moveable relative to the cartridge frame to allow relative movement between the developing roller and photosensitive drum. A coil spring is also provided to bias the bearing toward the drum to create the required gap between the developing roller and drum. The gap is maintained by spacers mounted on the longitudinal ends of the developing roller. In addition, an abutting portion is provided on the bearing and is engageable with a stop portion on the cartridge frame to limit movement of the bearing toward the operative position photosensitive member.

Abstract: A cover (4) adapted for protecting a photosensitive member (2) of a process cartridge (1), the cover (4) comprising a filter (5) adapted to capture airborne particles from air flowing around or through the cover (4). Preferably, the filter (5) takes the form of a High Efficiency Particulate Air Filter, or “HEPA”, which contains micron sized pores for capturing the very smallest airborne particles.