Patents by Inventor Matthew A. Shepherd

Matthew A. Shepherd 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).

  • Publication number: 20190111619
    Abstract: In an example implementation, a method of printing a three-dimensional (3D) object includes scanning a print bar in a first direction over a build platform of a 3D printer to deposit a liquid agent onto a layer of build powder. The print bar is then indexed in a second direction substantially orthogonal to the first direction before scanning the print bar back over the build platform in a third direction opposite the first direction to deposit additional liquid agent onto the layer of build powder.
    Type: Application
    Filed: July 22, 2016
    Publication date: April 18, 2019
    Inventors: Wesley R. Schalk, Matthew A. Shepherd, Arthur H. Barnes
  • Publication number: 20190039303
    Abstract: In one example, a fusing system for an additive manufacturing machine includes a first carriage carrying a layering device and a fusing lamp, and a second carriage carrying a fusing agent dispenser. The first carriage and the second carriage are movable back and forth over the work area along the same line of motion so that the first carriage follows the second carriage in one direction and the second carriage follows the first carriage in the other direction.
    Type: Application
    Filed: October 19, 2016
    Publication date: February 7, 2019
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Arthur H. BARNES, Wesley R. SCHALK, Matthew A. SHEPHERD
  • Publication number: 20190030804
    Abstract: In one example, a temperature control system for a spreader roller in an additive manufacturing machine includes: a first duct to carry air to an air passage through the roller; a second duct to carry air away from the air passage through the roller; a fan to move air through the ducts; a temperature sensor to sense a temperature of the roller; and a controller to control a flow of air through the ducts based on a temperature sensed by the sensor.
    Type: Application
    Filed: March 17, 2016
    Publication date: January 31, 2019
    Inventors: William Winters, Wesley R. Schalk, Matthew A. Shepherd, Matt G. Driggers, Justin M. Roman
  • Publication number: 20190023008
    Abstract: According to an example, a printing apparatus may include two drop ejecting elements, a fluid circulating element, and a logic device. The logic device may determine whether one or both of a first drop ejecting element and a second drop ejecting element have been fired within a predetermined period of time prior to a current time. In response to the determination, the logic device may selectively transmit an output signal that is to cause the fluid circulating element to be selectively fired, in which the fluid circulating element is positioned to circulate fluid adjacent to both the first drop ejecting element and the second drop ejecting element.
    Type: Application
    Filed: April 29, 2016
    Publication date: January 24, 2019
    Inventors: Guan-Kwee Goh, Matthew A Shepherd, Mark Mackenzie
  • Publication number: 20180333914
    Abstract: In an example of a three-dimensional printing method, a polymeric build material is applied. A fusing agent is selectively applied on at least a portion of the polymeric build material. The fusing agent includes cesium tungsten oxide nanoparticles, a zwitterionic stabilizer, and an aqueous vehicle. The polymeric build material is exposed to electromagnetic radiation to fuse the portion of the polymeric build material in contact with the fusing agent to form a layer.
    Type: Application
    Filed: July 31, 2018
    Publication date: November 22, 2018
    Inventors: Stephen G. Rudisill, Vladek Kasperchik, Alexey S. Kabalnov, Shannon Reuben Woodruff, Thomas M. Sabo, Jake Wright, Hector Lebron, Vanessa Verzwyvelt, Morgan T. Schramm, Matthew A. Shepherd
  • Publication number: 20180297382
    Abstract: A method for inkjet nozzle spitting including conveying pages in a print direction along a transport through a printzone of a wide array printhead formed by a plurality of rows of nozzles disposed crosswise to the print direction, the nozzles to eject ink drops in accordance with print data. The method further includes maintaining a gap between pages as the gap moves through the printzone, and providing spit pattern data as print data to the printhead to successively activate each row of nozzles, in the print direction and in synchronism with movement of the gap, to eject ink drops from all nozzles of the row so that a position of the activated row of nozzles is maintained within the gap as the gap continuously moves through the printzone.
    Type: Application
    Filed: February 16, 2016
    Publication date: October 18, 2018
    Inventors: Mark H MacKenzie, Matthew A Shepherd, Vanessa Verzwyvelt, Bruce A Axten, Weiyun Sun
  • Patent number: 10086606
    Abstract: A printer is disclosed. The printer has a print engine that mounts a first printhead and a second printhead adjacent to the first printhead in a staggered line of overlapping printheads. Each printhead has at least one row of nozzles. The blending nozzles in the first printhead overlap with blending nozzles in the second printhead. When printing, the non-overlapping nozzles in the first printhead use a default ink modulation amount and the blending nozzles in both printheads use a scaled ink modulation amount.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: October 2, 2018
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Matthew A Shepherd, Hsue-Yang Liu
  • Publication number: 20180275635
    Abstract: In an example, a print system include a component device that is operation in a number of state, a density engine, and a component engine. An example density engine identifies a plane region of a plane where print fluid is to be printed based on data of a print job and determines a density classifier for the plane based on a location of the plane region on the plane. An example component engine causes an adjustment of a component attribute of the component device based on the density classifier.
    Type: Application
    Filed: December 11, 2015
    Publication date: September 27, 2018
    Inventors: Dawn M Beachnau Hood, Matthew A. Shepherd, Mark H. MacKenize, Weiyun Sun, Milan Justel, Robert Yraceburu, Steve O. Rasmussen
  • Publication number: 20180244090
    Abstract: A method including printing a calibration pattern with a wide array printhead having a plurality of printhead dies. The method includes scanning the calibration pattern with a scanbar having a width less than a width of the wide array printhead by indexing the scanbar to a plurality of selected positions across a width of the calibration pattern and providing a scanned calibration image at each selected position, the calibration images together providing a scan of the full width of the calibration pattern, and measuring alignment between successive printhead dies based on the calibration images.
    Type: Application
    Filed: November 19, 2015
    Publication date: August 30, 2018
    Inventors: Hsue-Yang Liu, Matthew A Shepherd
  • Publication number: 20180128454
    Abstract: In example implementations, an apparatus and method are provided. The apparatus includes a movable carriage, an energy source coupled to the movable carriage and a plurality of shutters coupled to the movable carriage. In one example, the plurality of shutters is coupled to the movable carriage along a length of the energy source. Each one of the plurality of shutters may be coupled to the movable carriage via respective coupling mechanism that provides a continuously variable movement of each one of the plurality of shutters.
    Type: Application
    Filed: July 29, 2015
    Publication date: May 10, 2018
    Inventors: Matthew A Shepherd, Wesley R Schalk, Pierre J Kaiser, Arthur H. Barnes, Matt G Driggers
  • Publication number: 20180077315
    Abstract: Examples include computing devices, processes, and/or machine-readable storage mediums. Examples analyze a region of pixels for a digital image to determine a set of diagonal direction pixel differences corresponding to a target pixel. Examples analyze the region of pixels to determine diagonal variances corresponding to the target pixel. Examples scale the digital image by processing the target pixel into a set of subpixels based at least in part on the set of diagonal direction pixel differences and the diagonal variances.
    Type: Application
    Filed: June 26, 2015
    Publication date: March 15, 2018
    Applicant: Hewlett-Packard Development Company, L.P.
    Inventors: Jay S Gondek, Matthew A Shepherd
  • Patent number: 9849671
    Abstract: A printer comprising a printhead comprising a number of non-staggered nozzles and a processor communicatively coupled to the printhead, in which the processor executes computer usable program code to adjust the firing time of a number of nozzles within a group of nozzles by a portion of a full dot row. A method comprising, with a processor, adjusting the firing time of a number of nozzles within a group of nozzles of a printhead by a portion of a full dot row by delaying the firing of a subset of those nozzles by a full dot row, in which the nozzles of the printhead are not staggered.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: December 26, 2017
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Matthew A. Shepherd
  • Publication number: 20170310852
    Abstract: A system, method, and non-transitory computer readable medium are disclosed for mitigating dot placement errors for a given print job. The method includes processing tone values on a per pixel basis to determine whether to implement plane dependence. Plane independence is implemented if the tone value exceeds a predetermined threshold. The method may be performed on a pixel by pixel basis and/or a print object or region basis. Determining whether to implement plane dependence may involve de-asserting or partially de-asserting a plane dependence component of an executed half-toning instruction between sequentially processed color planes of a printing system.
    Type: Application
    Filed: October 14, 2014
    Publication date: October 26, 2017
    Inventors: Jason Quintana, Tsuyoshi Yamashita, Matthew A Shepherd
  • Patent number: 9782978
    Abstract: A printer includes a printbar having plural dice partially overlap in the direction of rows and a halftoner. The dice receive nozzle firing data which determines when and where the individual print nozzles are to be operated in order to emit the colorant onto the media so as to form the desired printed image on a media. The halftoner is a bidirectional error diffusion halftoner that is structured to generate halftoned data. The halftoned data is mappable into the firing data. The halftoner includes a serpentine direction reverser which is structured to halftone print data image pixels in a first serpentine direction to form halftoned data and then to halftone print data image pixels in an opposite serpentine direction to form the halftoned data.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: October 10, 2017
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Bradley D Chung, Hsue-Yang Liu, Matthew A Shepherd, Mark H MacKenzie, Jason M Quintana
  • Publication number: 20170151808
    Abstract: Bidirectional error diffusion halftoning of data. Pixels are halftoned in one serpentine direction, and pixels are halftoned in an opposite serpentine direction.
    Type: Application
    Filed: May 29, 2014
    Publication date: June 1, 2017
    Inventors: Bradley D Chung, Hsue-Yang Liu, Matthew A Shepherd, Mark H Mackenzie, Jason M Quintana
  • Publication number: 20170028717
    Abstract: A printer is disclosed. The printer has a print engine that mounts a first printhead and a second printhead adjacent to the first printhead in a staggered line of overlapping printheads. Each printhead has at least one row of nozzles. The blending nozzles in the first printhead overlap with blending nozzles in the second printhead. When printing, the non-overlapping nozzles in the first printhead use a default ink modulation amount and the blending nozzles in both printheads use a scaled ink modulation amount.
    Type: Application
    Filed: April 8, 2014
    Publication date: February 2, 2017
    Inventors: Matthew A SHEPHERD, Hsue-Yang LIU
  • Publication number: 20160303851
    Abstract: A printer comprising a printhead composing a number of non-staggered nozzles and a processor communicatively coupled to the printhead, in which the processor executes computer usable program code to adjust the firing time of a number of nozzles within a group of nozzles by a portion of a full dot row. A method comprising, with a processor, adjusting the firing time of a number of nozzles within a group of nozzles of a printhead by a portion of a full dot row by delaying the firing of a subset of those nozzles by a full dot row, in which the nozzles of the printhead are not staggered.
    Type: Application
    Filed: January 30, 2014
    Publication date: October 20, 2016
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventor: Matthew A. Shepherd
  • Patent number: 9427991
    Abstract: An example device in accordance with an aspect of the present disclosure includes a controller to adjust print speed intra-page according to a response curve to substantially track a power curve of a power supply. The controller is to maximize print speed based on short-term energy data corresponding to present and future print data and long-term energy data corresponding to past print data, without exceeding a peak power output and a thermal limit of the power supply when printing according to the response curve.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: August 30, 2016
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Todd Goyen, Duane A Koehler, Matthew A. Shepherd
  • Patent number: 9415585
    Abstract: An example device in accordance with an aspect of the present disclosure includes a controller to generate predicted and past power consumption values for at least one pen of a printer device, for a sliding window of future and past time, as a function of ink delivered data scaled by print speed data. The controller is to assign a dynamic power threshold for the present time as a maximum power consumption value of the sliding window, and stop power delivery to the at least one pen if the present power consumption of the at least one pen exceeds the dynamic power threshold by a margin.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: August 16, 2016
    Assignee: Hewlett-Packard Development Company, L. P.
    Inventors: Tod Goyen, Duane Koehler, Matthew A. Shepherd
  • Patent number: 9358788
    Abstract: Various configurations of print head die are described. In an example, a first print head die has first print structures disposed along a major dimension thereof perpendicular to the media path, the first print structures including a leading print structure with respect to the media path. A second print head die independent of the first print head die has second print structures disposed along a major dimension thereof perpendicular to the media path, the second print head die being staggered with respect to the first print head die along the media path, the second print structures including a leading print structure with respect to the media path. An extent between respective leading print structures of the first and second print head dies is between a minimum equal to a width of the first print head plus 100 ?m and a maximum value such that the distance along the media path between any of the first print structures and any of the second print structures does not exceed 10 mm.
    Type: Grant
    Filed: September 22, 2015
    Date of Patent: June 7, 2016
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Mark H. MacKenzie, Matthew A. Shepherd, Wesley R. Schalk