Patents by Inventor Donald E. Johnston

Donald E. Johnston 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).

  • Patent number: 9233813
    Abstract: According to aspects illustrated herein, a system, a printmaking device, and a method for pre-curling and registering media are provided herein. The system includes a media curler system and a deskew mechanism. The media curler system pre-curls at least one of lead edge and a trail edge of a sheet before delivery to a media hold-down transport. The deskew mechanism is coupled to the media curler system for pivoting the media curler system about a pivot axis to deskew the sheet. The pivot axis extends perpendicular to the media transport path. In operation, as the lead edge enters the pre-curling and registration system, the media curler system pre-curls the sheet towards the media hold-down transport. As the sheet is being pre-curled, the deskew mechanism pivots the media curler system about the pivot axis to correct any skew errors in the sheet.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: January 12, 2016
    Assignee: Xerox Corporation
    Inventors: Barry P. Mandel, Marina L. Tharayil, Donald E. Johnston
  • Publication number: 20140197595
    Abstract: According to aspects illustrated herein, a system, a printmaking device, and a method for pre-curling and registering media are provided herein. The system includes a media curler system and a deskew mechanism. The media curler system pre-curls at least one of lead edge and a trail edge of a sheet before delivery to a media hold-down transport. The deskew mechanism is coupled to the media curler system for pivoting the media curler system about a pivot axis to deskew the sheet. The pivot axis extends perpendicular to the media transport path. In operation, as the lead edge enters the pre-curling and registration system, the media curler system pre-curls the sheet towards the media hold-down transport. As the sheet is being pre-curled, the deskew mechanism pivots the media curler system about the pivot axis to correct any skew errors in the sheet.
    Type: Application
    Filed: March 18, 2014
    Publication date: July 17, 2014
    Applicant: XEROX CORPORATOIN
    Inventors: Barry P. Mandel, Marina L. Tharayil, Donald E. Johnston
  • Patent number: 8702094
    Abstract: According to aspects illustrated herein, a system, a printmaking device, and a method for pre-curling and registering media are provided herein. The system includes a media curler system and a deskew mechanism. The media curler system pre-curls at least one of lead edge and a trail edge of a sheet before delivery to a media hold-down transport. The deskew mechanism is coupled to the media curler system for pivoting the media curler system about a pivot axis to deskew the sheet. The pivot axis extends perpendicular to the media transport path. In operation, as the lead edge enters the pre-curling and registration system, the media curler system pre-curls the sheet towards the media hold-down transport. As the sheet is being pre-curled, the deskew mechanism pivots the media curler system about the pivot axis to correct any skew errors in the sheet.
    Type: Grant
    Filed: April 12, 2011
    Date of Patent: April 22, 2014
    Assignee: Xerox Corporation
    Inventors: Barry P. Mandel, Marina L. Tharayil, Donald E. Johnston
  • Publication number: 20120262513
    Abstract: According to aspects illustrated herein, a system, a printmaking device, and a method for pre-curling and registering media are provided herein. The system includes a media curler system and a deskew mechanism. The media curler system pre-curls at least one of lead edge and a trail edge of a sheet before delivery to a media hold-down transport. The deskew mechanism is coupled to the media curler system for pivoting the media curler system about a pivot axis to deskew the sheet. The pivot axis extends perpendicular to the media transport path. In operation, as the lead edge enters the pre-curling and registration system, the media curler system pre-curls the sheet towards the media hold-down transport. As the sheet is being pre-curled, the deskew mechanism pivots the media curler system about the pivot axis to correct any skew errors in the sheet.
    Type: Application
    Filed: April 12, 2011
    Publication date: October 18, 2012
    Applicant: XEROX CORPORATION
    Inventors: Barry P. Mandel, Marina L. Tharayil, Donald E. Johnston
  • Publication number: 20110064499
    Abstract: This invention uses a paper registration device with a paper transport and a stalled roll together with an upstream and downstream CIS to enable paper skew measurements. The upstream CIS is positioned on a paper sheet transport between a beginning pre-registration nip and a buckle control sensor. A second downstream CIS is aligned with the first upstream CIS to provide skew measurement on the same side of a paper sheet. An advantage of this registration device is that it simultaneously corrects registration in a process direction, a cross process direction and corrects skew angle.
    Type: Application
    Filed: September 16, 2009
    Publication date: March 17, 2011
    Applicant: XEROX CORPORATION
    Inventors: Donald E. Johnston, Joseph J. Ferrara
  • Publication number: 20080247796
    Abstract: A device, method and program for automatically adjusting a paper curl of media in an imaging device are provided. The imaging device includes a decurler having two rollers defining a nip. A first roller has a substantially uncompressible surface, and a second roller has a substantially compressible surface. The first roller penetrates the second roller at the nip. The amount of curl of the media is adjusted at the nip by automatically adjusting the penetration of the second roller into the first roller. The amount of penetration of the second roller into the first roller is based on a set of factors and conditions. A penetration value based on the factors and conditions is used to adjust the position of the first roller and the second roller respective to each other, which in turn, will alter or reduce the media curl to a target curl.
    Type: Application
    Filed: April 4, 2007
    Publication date: October 9, 2008
    Applicant: XEROX CORPORATION
    Inventors: Donald E. JOHNSTON, Thomas C. KEYES, Brian C. CYR
  • Patent number: 7062218
    Abstract: A quad roll sheet curl control apparatus uses elastomer first and second rolls forming first and second nips with third and fourth rolls. The first and second rolls have compressible surfaces, while the third and fourth roll surfaces are formed of a substantially uncompressible material. A pivotable gate member in operating relationship with the first and second nips directs sheets to either the first or the second nip whereby the desired decurling orientation is achieved for the sheet by either the elastomer first roll or the elastomer second roll. Switching nips and curl to be induced does not require drive reversal as previous decurler arrangements do. The degree of decurling can be adjusted with at least one cam in communication with at least one of the first and second rolls.
    Type: Grant
    Filed: April 9, 2003
    Date of Patent: June 13, 2006
    Assignee: Xerox Corporation
    Inventors: Daniel H. Burnett, Kenneth E. Giunta, Donald E. Johnston, Arthur H. Kahn, Anthony G. Poletto, Harry Ramos
  • Publication number: 20040042831
    Abstract: A quad roll sheet curl control apparatus uses elastomer first and second rolls forming first and second nips with third and fourth rolls. The first and second rolls have compressible surfaces, while the third and fourth roll surfaces are formed of a substantially uncompressible material. A pivotable gate member in operating relationship with the first and second nips directs sheets to either the first or the second nip whereby the desired decurling orientation is achieved for the sheet by either the elastomer first roll or the elastomer second roll. Switching nips and curl to be induced does not require drive reversal as previous decurler arrangements do. The degree of decurling can be adjusted with at least one cam in communication with at least one of the first and second rolls.
    Type: Application
    Filed: April 9, 2003
    Publication date: March 4, 2004
    Applicant: Xerox Corporation
    Inventors: Daniel H. Burnett, Kenneth E. Giunta, Donald E. Johnston, Arthur H. Kahn, Anthony G. Poletto, Harry Ramos
  • Patent number: 6186497
    Abstract: A low cost inverter apparatus of includes a dual positionable, multi-function gate and a stationary baffle that guides sheets toward catch or output trays or work in conjunction with reversible rolls to direct the sheets into a duplex path. The dual positionable gate and stationary baffle have points thereon that are positioned to use the beam strength of the sheets to align the sheets with a duplex nip that feeds the sheet into the duplex path.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: February 13, 2001
    Assignee: Xerox Corporation
    Inventor: Donald E. Johnston
  • Patent number: 6111192
    Abstract: An EMI shielded collapsible enclosure includes an upper enclosure half having a top wall connecting a surrounding upper sidewall, the top wall and upper sidewall being adapted to provide EMI resistance. A lower enclosure half has a bottom wall connecting a surrounding sidewall, the bottom wall and lower sidewall being adapted to provide EMI resistance. The upper sidewall and lower sidewall are of similar shape, with one smaller than the other to be telescopically received therein. Actuators are operatively associated with the upper enclosure half and the lower enclosure half for selectively extending or retracting the enclosure halves between a transport mode and an operational mode, an interior space defined by the upper enclosure half and the lower enclosure half being substantially larger in the operational mode.
    Type: Grant
    Filed: October 9, 1998
    Date of Patent: August 29, 2000
    Assignee: Marion Composites
    Inventors: Dean P. Bell, Elizabeth D. Burke, Paul E. Case, Donald E. Johnston, Ronald L. McCord, Donald Stanulis, W. Jeffrey Sturgill
  • Patent number: 5634188
    Abstract: A high capacity portable sheet cassette tray assembly for supporting and positioning a stack of sheets for feeding reliably, one at a time, in a sheet using machine. The high capacity cassette tray assembly includes a cassette frame for removing and reinstalling into a sheet supply station of the sheet using machine. The cassette frame has a front end over which sheets are fed into the machine, and forward feed corner snubbers that are mounted to the front end of the cassette frame. The high capacity cassette tray assembly also includes a liftable base plate mounted within the cassette frame for supporting a high capacity stack of sheets having a topmost sheet. Further, the high capacity cassette tray includes a constant angle parallelogram lifting assembly that has a rear end connected to the cassette frame, and a front end connected to the liftable base plate for lifting and supporting the base plate and a topmost sheet of a stack of sheets on the base plate.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: May 27, 1997
    Assignee: Xerox Corporation
    Inventors: Donald E. Johnston, Bruce A. Winship, Richard C. Benton
  • Patent number: 5370381
    Abstract: A retard assembly for use in a friction retard separator feeder has a retard member, a support member for supporting the retard member, the retard assembly being mountingly engageable with a pivoting support frame for supporting the retard assembly at a first end of the pivot support frame and having a pivot point at its opposite end and substantially remote from the first end, the retard member support member having at least one mounting hub for mounting a locating pivot pin, which is engageable with the first end of the pivoting support frame, the retard member support member including at least one energy absorbing damping pad on the at least one mounting hub to absorb vibration of the retard pad between the retard member support member and the pivoting support frame when they are engaged, the energy absorbing damping pad being of a hardness sufficient to maintain an interference fit between the at least one mounting hub and the pivoting support frame to resist a permanent set.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: December 6, 1994
    Assignee: Xerox Corporation
    Inventors: Bruce A. Winship, Donald E. Johnston, Richard C. Benton
  • Patent number: 5163668
    Abstract: A retard assembly for use in a friction retard separator and feeder comprising a support member for supporting a retard member and a sheet entrance guide at the incoming end of the retard assembly having a substantially vertical portion and a substantially horizontal portion overlying the incoming guide entrance portion of the retard member in advance of the retard portion of the retard member, said sheet guide being vertically compliant and movable in said support member to enable a reduction in the spring rate in the entrance guide portion of the retard member to a level substantially below the level in the retard portion.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: November 17, 1992
    Assignee: Xerox Corporation
    Inventors: Bruce A Winship, Donald E. Johnston, Richard C. Benton
  • Patent number: 4771259
    Abstract: A connecting apparatus for connecting one end of a spring of a time-delay fuse to a hollow body of the fuse and a method for its manufacture is disclosed. The apparatus includes two transverse slots formed in the end of the body. An insert is placed in the slots. A central portion of the insert is disposed in the interior of the hollow body. An opening, such as one or more slots, is provided in the central portion of the insert for attaching one end of a spring to the insert and the body of the fuse. The other end of the spring is adapted to connect to a fusible element of the time-delay fuse. The method of manufacture of the apparatus includes forming transverse slots in the end of a hollow tube, placing the insert in the slots, and attaching one end of the spring to an opening in the insert. An alternative method of manufacture includes molding the hollow tube with an integral transverse member across the end of the tube, the transverse member having an opening in it.
    Type: Grant
    Filed: July 28, 1987
    Date of Patent: September 13, 1988
    Assignee: Cooper Industries, Inc.
    Inventors: Aldino J. Gaia, Donald E. Johnston