Xerox Corporation

William M OuYang

Michael E Farrell

Carla J Kinder

Donald L Miller

Jack Whipple

James M Pacer

Brendan C Casey

John C Austin

Steven W Baldwin

Pedro R Ortiz

James R York

George F Bergen

Vernon W Ulrich

George W Webster

Eugene L Smith

Patricia J Weber

Wayne Cheng

Josefina Moreno

Ana M Perez

Vilmarie Lopez-Heroux

Phillip E Chapman

Carolina Creus

Ronald E McGarvey

Julie A Lapp

Rita R Edmunds

Stephanie P Burton

Renard A Iannettone

David P Cropek

Darlene L Hulse

A system is disclosed for detecting defects in a printed image to analyze print quality of printers or copiers. The printed image is scanned by the scanner and the printed image data obtained in the scanner is fed back and compared with original image data. The system detects defects in the printed image in a closed loop manner. The printed image data is automatically fed back to a control unit so that a processor compares the printed image data with the original image data to detect defects in the printed image. The system analyzes comparison results to find skew in the printed image.

Method and system for print quality analysis

A system is disclosed for detecting defects in a printed image to analyze imaging problems in an image reproducing apparatus. The printed image is scanned by the scanner and the printed image data obtained in the scanner is fed back and compared with original image data. The system finds defects in the printed image in a closed loop manner. The printed image data is automatically feeds back to a control unit so that a processor compares the printed image data with the original image data to detect defects in the intermediate imaging member. The system determine whether the intermediate imaging member needs to be replaced on the basis of the comparison.

Method and system for analyzing imaging problems

An apparatus for mechanically assisting the transfer of an image from an image bearing member onto a substrate. The apparatus includes a transfer assist blade that forces a substrate toward an image bearing member, a motor, a mechanical assembly for coupling the motor to the transfer assist blade such that motor operation changes the transfer assist blade force, and a controller that controls the motor operation. The controller might receive inputs from a substrate sensor, an operator control panel, and/or a service adjustment. The controller might use those inputs to control the motor operation, and thus the transfer force. Alternatively, the controller might control the transfer force as a result of the operation of the overall machine, such as by changing the transfer force during duplex printing or during the transfer of various color images.

Variable transfer assist blade force

The physical integrity of a large-scale hardware connection between two modules, such as in the context of high-speed digital printing, is tested by entering a diagnostic mode in which single-instruction handshake routines are repeatedly sent from one module to another through a parallel bus. Each handshake routine activates all of the communication lines in the bus. If a sending module does not receive the expected response to the single-instruction handshake routine within a predetermined time, the sending module causes an audible signal to be emitted. Service personnel can manually manipulate various cables, connectors, and sockets forming a hardware connection while the system is in diagnostic mode, to isolate the location of a hardware fault.

Method and apparatus for testing a connection between digital processing

A method of maintaining consistent large solid area development by developing a large area test patch covering the image area of a photorececptor and detecting the lead edge and trail edge density of the test patch using a densitometer to measure reflectance. If a density differential between lead and trail edge density is detected, electrostatic parameters such as toner concentration, developer bias, and photoreceptor potential are adjusted to maintain constant large solid area development.

Automatic compensation for toner concentration drift due to developer

A method of normalizing the count in a counter depending upon the type or size of the copy sheets processed in an electronic image processing machine including the steps of determining the size or type of copy sheets in process in the machine, recording a count in the counter in response to the size or type of copy sheets in process, normalizing the count in the counter as a function of the change in size or type of the copy sheets in process, and relating the normalized counts to the need to replace selected components of the image processing machine.

Normalizing sheet count to predict hardware replacement intervals

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

In copying or printing, proper printed copy sheets generated from the printing operation may be selectably operator directed to various different copy sheet output compiling stations, such as a stacking tray or a finisher compiler. Those copy sheets desired to be purged rather than provided as finished copies {called purge sheets below} are directed to a particlar designated such station for operator removal and disposal. Preferably this designated purge station is a readily operator accessible existing top tray. In this system, reduced printing delays are provided by continuing the printing process as long as the proper copy sheets are selectably directed to a copy sheet output compiling station which is not the same tray or station into which the purge sheets have been directed in the same printing operation, or, as long as the proper copy sheets will not be stacked on top of the purge sheets in that same tray. The printing operation of the copy sheets is automatically stopped to prevent such intermixing of the purged sheets with the proper copy sheets in the same output tray. However, this interrupted printing operation can then resume in response to sensing that all the sheets in that tray have been removed, which may be directed.

System for segregating purge sheets and continued printing

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Rochester, NY, United States of America

William M OuYang