Abstract: An integral removable duplex module for use in conjunction with a reproduction processor is disclosed including two paper trays, a first operable as a duplex copy buffer tray or a papaer tray and a second operable as an auxiliary paper tray, each tray having a copysheet feeder associated therewith comprised of a single cam operated mechanism having two cantilevered arms supporting constantly rotating feed rollers suspended above each paper tray and associated tray elevator mechanisms which enhances copysheet feeding when the feed rollers are pivoted toward the trays into copysheet feeding position and maintain copysheet trays in non-feeding positions during non-feeding operation. Copysheets are received in the duplex copy buffer tray from the reproduction processor via a reversible exit nip at the output of the processor, which directs sheets passed to an output back to a duplex module paper path, for repassing through the reproduction processor.

Abstract: A scorotron and control therefor for charging and/or discharging a charge retentive surface such as a photoreceptor of the type utilized in the process of xerographic printing. The control connects the wire grid of the scorotron to ground via a plurality of zener diodes and a variable resistor. The voltage across the variable resistor is low compared to the total circuit voltage so that variations in the grid current result in small variations in grid voltage. The control provides for compensation for out of tolerance zener diodes as well as for photoreceptor aging manufacturing tolerances and temperature elevation. When the variable resistor is a light dependent resistor a light emitting diode contained in a bridge network also containing a thermistor provides for automatic compensation due to elevation in photoreceptor temperature when such temperature is sensed by the thermistor.

Abstract: Cleaning apparatus for removing residual single component magnetic toner from a charge retentive surface. The cleaning apparatus comprises a magnetic cleaning roller and a magnetic image disturber, the latter of which includes a pair of blade members which are spacially oriented so that two adjacent ends thereof form a gap therebetween which is disposed adjacent the charge retentive surface. The opposite ends of the blade members are disposed adjacent the magnetic roller such that upon rotation of the roller a pulsating magnetic field is created across the gap.

Abstract: Cleaning apparatus for removing residual toner particles from a charge retentive surface. The apparatus utilizes a cleaning brush to which an electrical bias is applied in order to enhance the toner removal. The brush has different biases applied thereto in accordance with the area of the charge retentive surface being cleaned. Thus, when toner is being removed from the document area of the charge retentive surface, one bias level is applied and when the interdocument area is being cleaned a different bias is applied thereby increasing the cleaning latitude.