Xerox Corporation

Pedro R Ortiz

Michael E Farrell

John C Austin

Carla J Kinder

David Lee Rasmussen

James F Matysek

William M OuYang

George W Webster

Josefina Moreno

Rita R Edmunds

Renard A Iannettone

Darlene L Hulse

A method and apparatus for operating an electronic reprographic system providing for the storing of information in the system of the status of all jobs in the system, monitoring the system for faults, providing for crash recovery wherein communication between processing units of the system enables the system to recommence printing at the point at which a crash occurred, and allowing the system to tie a fault discovered in the system with a job containing a faulted feature so that the printing jobs may be completed sequentially up to a job requiring a faulted feature. Additionally, the system is capable of permitting a higher priority job to interrupt a currently printed job in order to be printed non-sequentially.

Method and apparatus of utilizing stored job information in an

Gaps which naturally exist in the output of printed copy sheets from a duplex paper path due to duplex printing are selectively combined with interset interval skipped pitches so as to provide an appropriate interset interval between each set of printed copy sheets output from a printer, while minimizing the number of skipped pitches which actually need to be scheduled.

Method for duplex printing scheduling system combining finisher interset

A printer dynamic job recovery operation in an electronic reprographic system includes automatic detection of a printed sheet having an image thereon with a relative loss of integrity. Specified sheets are automatically purged to a specified location in response to such detection. The purging can begin at the first detected sheet or up to three sheets in advance of the detected sheet. Job recovery for job completion can be initiated immediately without cycling down the printer.

Printer dynamic job recovery in an electronic reprographic printing

Printer job recovery for use in an electronic reprographic system includes the detection of faults affecting printer operation. If such a fault is detected, fault recovery is effected and operation continues. It is then determined whether the jobs are incomplete. If not, recovery is skipped and normal operation continues. If, however, it is determined that there are incomplete jobs, it is then determined whether there are any partially complete jobs. If not, normal system operation continues. Upon determination that there are partially complete jobs, the system recovers the oldest partially complete job. It is again determined whether there are any partially complete jobs. The cycle continues until it is determined that there are no partially complete jobs.

Printer job recovery of complete or partially complete jobs in an

Productivity in electronic printer incorporating finishing activities and operating in a job streaming mode are enhanced by utilizing software to calculate and predict the minimum delay corresponding to minimum skip pitches) in successive jobs requiring finishing activities such as binding and stapling. Printing and collating of sets of original scanned documents are controlled so that collated sets are successively presented by the printer to the finisher nearly coincident with conclusion of the finishing activity being accomplished for a current job. Additional software innovations allow job scheduling for jobs involving complex pitch time delays created by scanning simplex and duplex documents returned in random order. For this case optimum delay time is the cumulative finishing hardware delays as well as imaging/paper path delays. Still another feature is a predictive algorithym which is used to increase reliability of printer components by cycling down the printer between jobs in situations where the finishing activity for a current job requires an extraordinarily long time to complete compared with the cycle down/cycle up time of the printer.

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Webster, NY, United States of America

Pedro R Ortiz