Patents by Inventor David Mark Kerxhalli
David Mark Kerxhalli has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9523956Abstract: An apparatus adapted for presenting a sheet of media to an image transfer structure. The apparatus includes a registration baffle positioned in an offset relationship relative to the image transfer structure and a pre-transfer baffle assembly including a first baffle oppositely disposed to a second baffle, the pre-transfer assembly generally forms an āSā shape and is adapted for guiding the sheet of media from the registration baffle to the image transfer structure. The pre-transfer baffle assembly is arranged in a first position adapted for guiding the sheet of media toward the image transfer structure at an angle of less than ninety degrees, and the pre-transfer baffle automatically begins rotation to a second position as the sheet of media reaches a pre-determined position within a paper path.Type: GrantFiled: August 14, 2013Date of Patent: December 20, 2016Assignee: Xerox CorporationInventors: Jonathan B. Hunter, David Mark Kerxhalli, David R. Kretschmann, Ronald W. Bogert
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Patent number: 9180695Abstract: A method including: displacing a plurality of sheets through a defined portion of a process path; generating, using an encoder, a first number of encoder pulses associated with displacing a first sheet from the plurality of sheets along the defined portion; applying first indicia to a first side of the first sheet; displacing the first sheet through the defined portion; generating, using the encoder, a second number of encoder pulses associated with displacing the first sheet along the defined portion; calculating, using a processor, a ratio including the first and second numbers; applying second indicia to the respective second side of the first sheet or third indicia to the respective first side of a second sheet from the plurality of sheets, or fourth indicia to the respective second side of the second sheet; and adjusting, using the processor, application of the second, third, or fourth indicia according to the ratio.Type: GrantFiled: April 23, 2013Date of Patent: November 10, 2015Assignee: Xerox CorporationInventors: David Mark Kerxhalli, Jonathan B. Hunter, David R. Kretschmann, Ronald W. Bogert
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Publication number: 20150050058Abstract: An apparatus adapted for presenting a sheet of media to an image transfer structure. The apparatus includes a registration baffle positioned in an offset relationship relative to the image transfer structure and a pre-transfer baffle assembly including a first baffle oppositely disposed to a second baffle, the pre-transfer assembly generally forms an āSā shape and is adapted for guiding the sheet of media from the registration baffle to the image transfer structure. The pre-transfer baffle assembly is arranged in a first position adapted for guiding the sheet of media toward the image transfer structure at an angle of less than ninety degrees, and the pre-transfer baffle automatically begins rotation to a second position as the sheet of media reaches a pre-determined position within a paper path.Type: ApplicationFiled: August 14, 2013Publication date: February 19, 2015Applicant: Xerox CorporationInventors: Jonathan B. Hunter, David Mark Kerxhalli, David R. Kretschmann, Ronald W. Bogert
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Publication number: 20140311367Abstract: A method including: displacing a plurality of sheets through a defined portion of a process path; generating, using an encoder, a first number of encoder pulses associated with displacing a first sheet from the plurality of sheets along the defined portion; applying first indicia to a first side of the first sheet; displacing the first sheet through the defined portion; generating, using the encoder, a second number of encoder pulses associated with displacing the first sheet along the defined portion; calculating, using a processor, a ratio including the first and second numbers; applying second indicia to the respective second side of the first sheet or third indicia to the respective first side of a second sheet from the plurality of sheets, or fourth indicia to the respective second side of the second sheet; and adjusting, using the processor, application of the second, third, or fourth indicia according to the ratio.Type: ApplicationFiled: April 23, 2013Publication date: October 23, 2014Inventors: David Mark Kerxhalli, Jonathan B. Hunter, David R. Kretschmann, Ronald W. Bogert
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Patent number: 8767220Abstract: A method of calibrating a printing system for positioning at least one printed image, the printing system includes a first image bearing surface, the method includes: a) forming a background pattern and at least three fiducials on the first image bearing surface, wherein the background pattern is larger than a first printed image and the at least three fiducials are within an area formed by the first printed image; b) transferring a portion of the first printed image to a second image bearing surface; c) measuring a first residual image on the first image bearing surface, wherein the first residual image is a portion of the background pattern and the at least three fiducials remaining on the first image bearing surface after the step of transferring; and, d) calculating at least one calibration parameter for the printing system based on the measuring of the first residual image.Type: GrantFiled: February 9, 2010Date of Patent: July 1, 2014Assignee: Xerox CorporationInventors: Jonathan B. Hunter, Andrew James Bonacci, David Mark Kerxhalli, Brian R. Conrow, Michael J. Martin
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Patent number: 8744328Abstract: A fluid delivery system is controlled to adjust a release fluid delivery rate to a rate that is predetermined to be effective for fusing a next sheet in a print job before the sheet arrives at a fusing nip. Predetermined rates and corresponding media types may be stored in memory. A controller controls the fluid release system for a print job in accordance with a print job schedule based on the predetermined fluid delivery rates.Type: GrantFiled: October 28, 2011Date of Patent: June 3, 2014Assignee: Xerox CorporationInventors: Paul M. Fromm, David Mark Kerxhalli, Benjamin Whitney Paulson, Aldwin A. Roberts, Michele Donna Cleary, David Lee Rasmussen, Biruk Gossaye, Jamison Charles DeLorenzo
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Patent number: 8570587Abstract: According to aspects of the embodiments, there is provided methods and apparatus for sensing the movement of a moving surface by utilizing a plurality of reference patterns positioned on the surface, using the precision of the ROS Start of Scan Clock, and the uses of encoder and MOB sensors. The plurality of reference patterns are placed a known number of scanlines apart. The MOB sensor and encoder measure the distance between reference patterns. Increase accuracy is achieved by sampling the encoder signal with the ROS Master Clock and calculating a fractional encoder count at the first and last encoder counts of the measurement. The use of fractional encoder counts provides a speed measurement with greater tolerance for variations in encoder dimensions and belt thickness.Type: GrantFiled: April 21, 2010Date of Patent: October 29, 2013Assignee: Xerox CorporationInventors: David Mark Kerxhalli, Jonathan Byron Hunter
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Patent number: 8525857Abstract: Document processing systems and duplex printing methods are presented in which side 1 to side 2 image on paper (IOP) magnification errors are mitigated by use different speeds for raster output scanner (ROS) for scanning images for different final print sides, and by selective use of electronic registration adjustment by adding or removing sub-pixels from the image data to compensate for ROS speed change overshoot or undershoot.Type: GrantFiled: April 13, 2011Date of Patent: September 3, 2013Assignee: Xerox CorporationInventors: Jonathan B. Hunter, Andrew James Bonacci, David Mark Kerxhalli
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Publication number: 20130104990Abstract: A fluid delivery system is controlled to adjust a release fluid delivery rate to a rate that is predetermined to be effective for fusing a next sheet in a print job before the sheet arrives at a fusing nip. Predetermined rates and corresponding media types may be stored in memory. A controller controls the fluid release system for a print job in accordance with a print job schedule based on the predetermined fluid delivery rates.Type: ApplicationFiled: October 28, 2011Publication date: May 2, 2013Applicant: XEROX CORPORATIONInventors: Paul M. FROMM, David Mark Kerxhalli, Benjamin Whitney Paulson, Aldwin A. Roberts, Michele Donna Cleary, David Lee Rasmussen, Biruk Gossaye, Jamison Charles DeLorenzo
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Publication number: 20120293596Abstract: Multiple beam raster output scanners (ROSs) and printing systems are presented in which an adjustable mirror or lens is provided in the optical beam path upstream of the ROS polygon mirror to allow automated electronic adjustment of line-to-line and swath-to-swath spacing at runtime.Type: ApplicationFiled: May 17, 2011Publication date: November 22, 2012Applicant: XEROX CORPORATIONInventors: Jonathan B. Hunter, David Robert Kretschmann, David Mark Kerxhalli, Ronald W. Bogert
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Patent number: 8295749Abstract: A method of controlling the inverter dwell time of the first print engine in order to print any sheet size within a pitch mode without the need for a belt sync dead-cycle. The method uses a small nominal inverter dwell time based on the maximum sheet size for a given pitch mode. For any sheet size within the pitch mode that is smaller than the maximum sheet size, the inverter dwell time will increase proportionally.Type: GrantFiled: June 2, 2010Date of Patent: October 23, 2012Assignee: Xerox CorporationInventors: David Mark Kerxhalli, David Robert Kretschmann
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Publication number: 20120262528Abstract: Document processing systems and duplex printing methods are presented in which side 1 to side 2 image on paper (IOP) magnification errors are mitigated by use different speeds for raster output scanner (ROS) for scanning images for different final print sides, and by selective use of electronic registration adjustment by adding or removing sub-pixels from the image data to compensate for ROS speed change overshoot or undershoot.Type: ApplicationFiled: April 13, 2011Publication date: October 18, 2012Applicant: XEROX CORPORATIONInventors: Jonathan B. Hunter, Andrew James Bonacci, David Mark Kerxhalli
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Patent number: 8264516Abstract: A magnification adjustment method for a document processing system having a fixed frequency clock source providing a fixed frequency output signal to a plurality of raster output scanners (ROSs) and a numerically controlled oscillator (NCO)-based adjustable frequency clock source providing an adjustable frequency output signal to the ROSs is disclosed. The method includes: using a controller to determine a frequency setting for a phase increment control input signal to the adjustable frequency clock source; starting the document processing system; using the controller to set a phase accumulator control input to the frequency setting; sending a message to a ROS control module prior to imaging, including the correct clock source to use for the next image, the correct clock source being either the fixed frequency clock source or the adjustable frequency clock source; and applying the correct clock source synchronously to the beginning of an inter image panel zone.Type: GrantFiled: December 23, 2009Date of Patent: September 11, 2012Assignee: Xerox CorporationInventors: James W. Stevens, David Mark Kerxhalli, Siddharth Rajiv Inamdar
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Patent number: 8180266Abstract: This disclosure provides a method, apparatus, and system for registering the transfer of an image from a belt to a media substrate associated with a printing device. Specifically, the exemplary methods use a ROS master clock and belt location sensor located downstream of a belt tensioning device to generate a reg sync signal to initiate transfer of the image.Type: GrantFiled: June 3, 2009Date of Patent: May 15, 2012Assignee: Xerox CorporationInventors: David Mark Kerxhalli, Siddharth Rajiv Inamdar, Paul Eugene Musicant
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Patent number: 8174735Abstract: Document processing systems and duplex printing methods are presented in which side 1 to side 2 process magnification errors are compensated for by selective use of two raster output scanner clocks for latent image generation of images destined for first and second sides of a printed substrate, with the second clock speed being increased to compensate for substrate shrinkage due to fusing station heating for two-sided printing.Type: GrantFiled: July 22, 2008Date of Patent: May 8, 2012Assignee: Xerox CorporationInventors: David Mark Kerxhalli, James W. Stevens, Thomas M. Baretsky
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Publication number: 20110299889Abstract: A method of controlling the inverter dwell time of the first print engine in order to print any sheet size within a pitch mode without the need for a belt sync dead-cycle. The method uses a small nominal inverter dwell time based on the maximum sheet size for a given pitch mode. For any sheet size within the pitch mode that is smaller than the maximum sheet size, the inverter dwell time will increase proportionally.Type: ApplicationFiled: June 2, 2010Publication date: December 8, 2011Applicant: XEROX CORPORATIONInventors: David Mark Kerxhalli, David Robert Kretschmann
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Publication number: 20110261372Abstract: According to aspects of the embodiments, there is provided methods and apparatus for sensing the movement of a moving surface by utilizing a plurality of reference patterns positioned on the surface, using the precision of the ROS Start of Scan Clock, and the uses of encoder and MOB sensors. The plurality of reference patterns are placed a known number of scanlines apart. The MOB sensor and encoder measure the distance between reference patterns. Increase accuracy is achieved by sampling the encoder signal with the ROS Master Clock and calculating a fractional encoder count at the first and last encoder counts of the measurement. The use of fractional encoder counts provides a speed measurement with greater tolerance for variations in encoder dimensions and belt thickness.Type: ApplicationFiled: April 21, 2010Publication date: October 27, 2011Applicant: XEROX CORPORATIONInventors: David Mark KERXHALLI, Jonathan Byron Hunter
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Patent number: 8041234Abstract: Aspects of the disclosure can provide a sensor system. The sensor system can include a belt having an undesirable portion and an aperture formed at a distance from the undesirable portion, a reflector located in the aperture, and a detector that senses a light reflected by the reflector to determine a location of the undesirable portion.Type: GrantFiled: July 2, 2008Date of Patent: October 18, 2011Assignee: Xerox CorporationInventors: David Mark Kerxhalli, Norman David Robinson, Jr., James Joseph Teich
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Publication number: 20110194131Abstract: A method of calibrating a printing system for positioning at least one printed image, the printing system includes a first image bearing surface, the method includes: a) forming a background pattern and at least three fiducials on the first image bearing surface, wherein the background pattern is larger than a first printed image and the at least three fiducials are within an area formed by the first printed image; b) transferring a portion of the first printed image to a second image bearing surface; c) measuring a first residual image on the first image bearing surface, wherein the first residual image is a portion of the background pattern and the at least three fiducials remaining on the first image bearing surface after the step of transferring; and, d) calculating at least one calibration parameter for the printing system based on the measuring of the first residual image.Type: ApplicationFiled: February 9, 2010Publication date: August 11, 2011Applicant: Xerox CorporationInventors: Jonathan B. HUNTER, Andrew James Bonacci, David Mark Kerxhalli, Brian R. Conrow, Michael J. Martin
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Publication number: 20110149302Abstract: A magnification adjustment method for a document processing system having a fixed frequency clock source providing a fixed frequency output signal to a plurality of raster output scanners (ROSs) and a numerically controlled oscillator (NCO)-based adjustable frequency clock source providing an adjustable frequency output signal to the ROSs is disclosed. The method includes: using a controller to determine a frequency setting for a phase increment control input signal to the adjustable frequency clock source; starting the document processing system; using the controller to set a phase accumulator control input to the frequency setting; sending a message to a ROS control module prior to imaging, including the correct clock source to use for the next image, the correct clock source being either the fixed frequency clock source or the adjustable frequency clock source; and applying the correct clock source synchronously to the beginning of an inter image panel zone.Type: ApplicationFiled: December 23, 2009Publication date: June 23, 2011Applicant: XEROX CORPORATIONInventors: James W. Stevens, David Mark Kerxhalli, Siddharth Rajiv Inamdar