Abstract: For use in an electrostatographic reproduction apparatus, a roller transfer assembly of compact configuration for effecting transfer of a pigmented marking particle image from a dielectric support to a receiver member. The roller transfer assembly comprises an electrically biased transfer roller, a mechanism for cleaning the transfer roller, and a detack mechanism for facilitating release of the receiver member from the dielectric support. A unitary housing is provided for supporting the transfer roller for free rotation about its longitudinal axis, supporting the cleaning mechanism in operative association with the transfer roller, and for supporting the detack mechanism. The unitary housing is supported for movement to a first position in operative association with the dielectric support and a second inoperative position remote from the dielectric support, and a mechanism is provided for selectively moving the unitary housing to the first position or to the second position.

Abstract: In an electrostatographic machine such as a copier or printer, a cleaning apparatus for removing charged and uncharged particles from the surface of an image-transfer assist member such as an intermediate transfer member. The cleaning apparatus includes a plurality of potential sources for selectively biasing the intermediate transfer member and the image-bearing member of the machine, and a dc corona discharge device for actively charging such particles on the intermediate transfer member for transfer back to the image-bearing member.

Abstract: A transfer member, for example, a transfer drum utilizes a vacuum applied through vacuum holes to the drum surface for holding a receiving sheet. A toner image is transferred to the sheet under the urging of an electric field. To prevent non-transfer over the vacuum holes, the holes are filled or covered with a conductive material that is sufficiently conductive to maintain the electric field over the holes and sufficiently porous to maintain the vacuum at the surface. For example, a polyurethane foam material can be used for the material in or over the vacuum holes.

Abstract: Photographic processing of a plurality of film discs is accomplished by rotating the discs partially immersed in chemical solutions. Processing trays, which contain the solutions, conform to the peripheries of the discs, reducing the volumes of the solutions and making single use batches of the solutions attractive. Single and multiple-tray approaches are included and, at least in the latter case, a transport mechanism is provided for transferring the discs from tray-to-tray while rotating the discs between the trays.