David Mark Kerxhalli, 549 Westland Ave, Rochester, NY 14618

6667756, Dec 23, 2003

Aug 27, 2001

09/682379

Brian R. Conrow - Rochester NY
David M. Kerxhalli - Rochester NY

Xerox Corporation - Stamford CT

B41J 2435

347248, 347234

The relationship between first and second side images is evaluated to determine how the position of the paper and/or the size and arrangement of an image can be manipulated to compensate for paper shrinkage caused by fusing. Show through is reduced by performing setup to adjust a pixel clock frequency and/or a photoreceptor speed, determining a residual magnification error, determining margin shifts to compensate for the residual magnification error, and applying the margin shifts. Paper shrink effects on registration can be compensated for using determinations made during a typical printer setup. Show through errors can be reduced without using a paper conditioner to pre-shrink or re-wet the paper. In simplex and duplex printing, the show through errors worsen as the image moves away from the registration edge. Using information obtained during setup, a margin shift is determined that results in a significant reduction in the maximum show through for each image.

6763199, Jul 13, 2004

Jan 16, 2002

10/046166

Brian R. Conrow - Rochester NY
David M. Kerxhalli - Rochester NY

Xerox Corporation - Stamford CT

G03G 1500

399 15, 399 72

Initial setup of image to sheet (IOS) or image to paper (IOP) registration in a printing device such as, for example, an electrographic printer, is accomplished in a single step that uses an initial set of measurements to determine and correct each of the independent registration errors, including image squareness/ROS skew, image skew/paper skew, lateral magnification, process magnification, lateral direction IOS or IOP position, and process direction IOS or IOP position simultaneously. A set of algorithms is used to perform a series of geometrical transformations to determine each of the six errors affecting IOS or IOP registration.

6806896, Oct 19, 2004

Aug 22, 2003

10/646594

Brian R. Conrow - Rochester NY
David M. Kerxhalli - Rochester NY

Xerox Corporation - Stamford CT

B41J 2435

347248, 347234

The relationship between first and second side images is evaluated to determine how the position of the paper and/or the size and arrangement of an image can be manipulated to compensate for paper shrinkage caused by fusing. Show through is reduced by performing setup to adjust a pixel clock frequency and/or a photoreceptor speed, determining a residual magnification error, determining margin shifts to compensate for the residual magnification error, and applying the margin shifts. Paper shrink effects on registration can be compensated for using determinations made during a typical printer setup. Show through errors can be reduced without using a paper conditioner to pre-shrink or re-wet the paper. In simplex and duplex printing, the show through errors worsen as the image moves away from the registration edge. Using information obtained during setup, a margin shift is determined that results in a significant reduction in the maximum show through for each image.

6903758, Jun 7, 2005

Jul 30, 2003

10/630073

David M. Kerxhalli - Rochester NY, US
Keith A. May - Palmyra NY, US
Brian R. Conrow - Rochester NY, US

Xerox Corporation - Stamford CT

G03G015/00

347116, 399301

A method for preserving image squareness and image on image registration in a system having a plurality of imaging stations, each imaging station having an ROS. The method includes adjusting the target skew of a reference ROS within one of the plurality of imaging stations by the angular difference between the actual reference ROS position and the target position for the reference ROS and adjusting the target skew of the reference ROS by the skew of the reference ROS relative to the desired skew for image squareness.

7039348, May 2, 2006

Jul 30, 2003

10/630063

David M. Kerxhalli - Rochester NY, US
Keith A. May - Palmyra NY, US
Brian R. Conrow - Rochester NY, US
Michael J. Martin - Hamlin NY, US
Michael J. Thomas - Penfield NY, US

Xerox Corporation - Stamford CT

G03G 15/01

399301, 347116, 346116, 399 38, 399 39, 399 40

A method for repositioning a mark on a belt after an image on paper registration process, which includes printing a test pattern, measuring at least one test pattern parameter, detecting a mark on a belt and detecting at least one imaging error associated therewith, using the at least one test pattern parameter and the at least one imaging error to determine the lateral distance required to shift a particular image to a desired location on the belt and shifting the image to the desired location.

7071956, Jul 4, 2006

Jan 7, 2002

10/041025

Brian R. Conrow - Rochester NY, US
David M. Kerxhalli - Rochester NY, US

Xerox Corporation - Stamford CT

G03G 15/00

347116, 399301

A method of correcting output image squareness in a laser printer system having a Raster Output Scanning (ROS) device with a pivotal mounting. The method includes printing a test pattern that includes a plurality of markers printed in a predetermined geometric arrangement and calculating a skew angle based on the measured distances, preferably using the Law of Cosines. The ROS device is then automatically rotated by an amount sufficient to correct the skew angle. The ROS rotation is performed automatically by an adjustment system connected to the ROS. The method optionally includes a scanner for scanning the test pattern image and making the measurements automatically via a program configured to analyze the scanned image.

7298998, Nov 20, 2007

Jun 26, 2006

11/426495

Ana P. Tooker - Penfield NY, US
David M. Kerxhalli - Rochester NY, US
Thomas M. Baretsky - Fairport NY, US

Xerox Corporation - Stamford CT

G03G 15/01

399301, 399302

A system and method to control imaging devices in a single-pass multi-color electrophotographic printing machine that includes a photoconductive member having a timing aperture, the photoconductive member moving along a path in the printing machine, and a plurality of imaging devices, each one of the plurality of imaging devices writing a latent image on the photoconductive member. The system further includes a sensor, located adjacent the photoconductive member, to sense the aperture in the photoconductive member as it passes the sensor and generate a signal indicative thereof and a control device and method that provides a timing signal for each of the plurality of imaging devices based on the signal generated by the sensor and a clock signal that is synchronous for all of the imaging devices.

7630672, Dec 8, 2009

May 21, 2007

11/804851

Thomas M. Baretsky - Fairport NY, US
Anne K. Fitzpatrick - Rochester NY, US
David Kerxhalli - Rochester NY, US
Wayne Morganti - Brockport NY, US
Mark S. Petrush - Webster NY, US
Mark Alan Scheuer - Williamson NY, US
Rod Stair - Churchville NY, US
James W. Stevens - Rochester NY, US

Xerox Corporation - Stamford CT

G03G 15/01

399301, 399 39, 399 40, 347116

A system and method for determining a color separation registration error in a multi-color printing system are provided. The system and method provide for instructing first and second color separations to mark a substrate with first and second fine-periodic-patch images to determine color separation registration error(s). The system and method further provide for determining whether at least an about half-period color separation registration error exists between the first and second color separations.