Cut-sheet xerographic copier having combing wheel sheet feed and a

Abstract

A multibin, cut-sheet xerographic copier capable of operating in a simplex or a duplex copy mode, wherein sheets are fed from a selected sheet stack, one at a time, to the copier's transfer station, by a sheet feeding means which includes a combing wheel. The combing wheel shingles the leading edge of the stack's top sheet to an open feed roller nip, to be sensed there by a pneumatic sensor. Sensing of this leading edge causes the combing wheel to be lifted off the stack. Subsequently, at a time determined by the copier's control logic, the drive nip closes to thereby feed the top sheet to the copier's paper registration gate, and then to its transfer station. As soon as this sheet's trailing edge has cleared the pneumatic sensor, and the drive nip has opened, the next sheet is staged at the shingled position, in the open drive nip. Side-one copied sheets, of intended duplex copies, are automatically stacked in a duplex bin. The bottom of the duplex bin includes a flat, resilient bottom-of-the-bin pad. This pad's position is adjustable in a plane parallel to the bottom of the duplex bin, to facilitate control of the direction in which side-one copied sheets are fed out to the copier's paper registration gate, for side-two copying.