Abstract: A corona wire tape assembly for a corona charger apparatus, such wire tape assembly providing for a more durable corona wire which is kept substantially clean and which can readily be replaced. The corona wire tape assembly comprises at least one conductive wire adapted to generate ions when having a high voltage from an electrical potential source applied thereto. A flexible dielectric film, separable into lengths substantially corresponding to desired corona wire lengths, encases the conductive wire. The flexible dielectric film defines a first series of openings communicating with the conductive wire to expose the wire to facilitate ion generation and a second series of openings communicating with the conductive wire to facilitate electrical connection of the wire to an electrical potential source.

Abstract: A reproduction apparatus machine control system adapted to transmit control information to a plurality of process subsystems without transmission lines uses two-way transmission of signals which are free to propagate between the process subsystems and a controller system without confinement to an electrical wire, cable, or optical fiber system. An enclosure surrounds the process subsystems and the controller system for preventing the leakage of transmitting signals to the area outside the enclosure, aiding the propagation of said signals within the enclosure, and substantially preventing the entrance of interference signals into the region surrounded by the enclosure.

Abstract: Color printer combining two small, reciprocating scanning process modules on respective photoconductor drums in two adjacent print engines. The two print engines are operable in a parallel electrophotographic processing scheme wherein charging, exposure, and development of two color images are achieved on the respective photoconductive drum. Accordingly, a composite four-color image is printed by superimposed transfer of first and second two-color developed toner images onto a receiver.

Abstract: A rotatable wiper blade roller for cleaning residual toner particles from an image-bearing surface includes a shroud, a plurality of indexable wiper blades that each engage the image-bearing surface at an angle of 60.degree. to 85.degree. defined in the direction of particle removal by the cleaning edge of each such blade and the image-bearing surface, that are each cleaned secondarily by an intermittently rotatable fur brush that is completely out of contact with the image-bearing surface.

Abstract: A toner concentration monitor includes a polarized dielectric member which, when dipped into a development mixture of carrier and toner particles, provides an accurate indication of the toner concentration of the mixture by the amount of toner particles which adhere to the member. The polarized dielectric member is preferably an electret.

Abstract: A sorter mechanism for receiving and stacking discrete sheets in a preselected order. A plurality of bins are provided for receiving discrete sheets delivered to the bins with a given side facing in a particular orientation. The bins, each of which have oppositely disposed first and second sheet supporting members, are positionable so as to support the sheets with the given side facing the first sheet supporting members when the bins are in a first position and with the given side facing the second sheet supporting members when the bins are in the second position. Sheets fed along a predetermined path to the sorter mechanism are directed into selective bins, the bins being selectively positioned in either of the mentioned positions dependent upon the original orientation of the given sheet side in the predetermined path and the desired final order of the sheets being stacked.