Abstract: A tri-directional inverter for use in machines requiring copy sheet inversion for collated copy set output uses four rollers forming three sheet-feeding nips. All sheets enter the center nip and contact a diverter gate that urges them in either of two directions. The sheets are corrugated by corrugating rollers as they enter a spring loaded inversion channel. The spring and corrugation rollers urge the sheets back out of the inversion channel into engagement with either of the selected other nips formed by the four rollers for feeding back into the machine for further processing.

Abstract: A copier particularly suitable for duplex copying is disclosed which includes a paper tray unit comprising first and second paper trays having a common sheet feeder. The first tray is mounted for movement between a lowered, operative position in which it is seated within the second tray and operatively associated with the sheet feeder and a raised inoperative position in which it is spaced over the second tray and the latter is operatively associated with the sheet feeder. The unit is mounted on slides for withdrawal to facilitate access and the arrangement is such that both trays are withdrawable together when the first tray is lowered and the second tray is withdrawable alone when the first tray is raised.