Xerox Corporation

James S Stoll

Douglas T Rabjohns

Robert J Isernia

Richard E Nearpass

In high speed reproduction apparatus in which closely spaced printed sheets are sequentially fed downstream in a sheet path at a process velocity, a dual inverter system of two independent but cooperative sheet inverters is sheet control gated to receive alternate sheets from the sheet path for inversion in the alternate independent sheet inverters. These dual alternate sheet inverters may advantageously operate at substantially the same sheet velocity as the connecting sheet path, instead of the much higher speed and acceleration/deceleration typical of conventional single inverter systems. This enables less critical higher speed cut sheet handling and thus more reliable faster printing. Yet collated sequential sheet order is maintained. This dual inverter system may be an integral part of a duplex path to provide inversion of sheets for duplex printing of their other sides.

High speed printer with dual alternate sheet inverters

In electronic collated printing of an electronic document of plural electronic pages with a printer printing normal sheets with a normal jam rate but printing abnormal printing sheets with a substantially higher jam rate, where associated with the electronic pages is printing sheet selection information, there is provided here electronic separation of the electronic pages of the document which specify the abnormal printing sheets. The system then prints those separated pages onto their abnormal printing sheets prior to printing any of the other electronic pages, temporarily holds them in an interposer, then prints the other pages of the document onto normal sheets, and provides collated merging in the interposer to provide collated output of the entire electronic document.

Electronic printing of print jobs containing jam-prone sheets

A method of arbitrarily interleaving the images of a second job with the images of a first job that is being completed at a first output station. A queue of jobs submitted to a marking machine for completion is scanned to determine if any of the queue of jobs can be interleaved with the first job during the first job production run. If so, one or more of the jobs in the queue are scheduled to be interleaved during the first job production run for completion at a second output station.

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Wolcott, NY, United States of America

James S Stoll