Patents by Inventor Stephen Edward Stewart

Stephen Edward Stewart 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: 7766568
    Abstract: A printhead carrier having a zero clearance bearing arrangement includes a first open-faced bearing coupled to a dampener frame. The first open-faced bearing has a first bearing surface positioned to contact the cylindrical guide surface of a guide rod of an imaging apparatus. A second open-faced bearing is coupled to the dampener frame. The second open-faced bearing has a second bearing surface positioned to contact the cylindrical guide surface of the guide rod. The guide rod is diametrically positioned between the first open-faced bearing and the second open-faced bearing. An elastic foam member is interposed between the first open-faced bearing and the dampener frame. The elastic foam member is compressed to exert an expansion force between the first open-faced bearing and the dampener frame to load the second open-faced bearing on the guide rod in a zero-clearance relationship with the guide rod.
    Type: Grant
    Filed: October 15, 2007
    Date of Patent: August 3, 2010
    Assignee: Lexmark International, Inc.
    Inventors: William Michael Connors, Stephen Edward Stewart
  • Patent number: 7712986
    Abstract: An imaging apparatus includes a printhead carrier for mounting a printhead cartridge. The printhead carrier includes a carrier back wall having an upper portion. A back portion of a printhead cartridge cradle is connected to the carrier back wall. A first proximal end of a latch lever is pivotably attached to a front portion of the printhead cartridge cradle. The latch lever has at least one cam follower, with each cam follower being located near the first distal end of the latch lever. A second proximal end of a carrier lid is pivotably attached to the upper portion of the carrier back wall. Each cam of the carrier lid is formed near a second distal end of the carrier lid, and each cam is positioned for progressive engagement by a corresponding cam follower as the latch lever is moved from an open position toward a latched position.
    Type: Grant
    Filed: July 24, 2006
    Date of Patent: May 11, 2010
    Inventors: David Wayne DeVore, Timothy John Hawryschuk, David Kyle Murray, Stephen Edward Stewart, Randall McClay Stoves
  • Patent number: 7591456
    Abstract: An auto-document feeder re-ingestion stop includes an auto-document feeder having a lower input tray and an upper output tray, the upper output tray having a length which is shorter than the length of input tray so that exiting or exited media depends onto the input tray, a flexible stopper depending from the upper output tray and inhibiting the exited media from being re-ingested by paper-to-paper friction during feeding of media in the input tray.
    Type: Grant
    Filed: May 24, 2007
    Date of Patent: September 22, 2009
    Assignee: Lexmark International, Inc.
    Inventors: William Michael Connors, Walter Kevin Cousins, Stephen Kelly Cunnagin, John Andrew Schmelz, Stephen Edward Stewart
  • Publication number: 20090097896
    Abstract: A printhead carrier having a zero clearance bearing arrangement includes a first open-faced bearing coupled to a dampener frame. The first open-faced bearing has a first bearing surface positioned to contact the cylindrical guide surface of a guide rod of an imaging apparatus. A second open-faced bearing is coupled to the dampener frame. The second open-faced bearing has a second bearing surface positioned to contact the cylindrical guide surface of the guide rod. The guide rod is diametrically positioned between the first open-faced bearing and the second open-faced bearing. An elastic foam member is interposed between the first open-faced bearing and the dampener frame. The elastic foam member is compressed to exert an expansion force between the first open-faced bearing and the dampener frame to load the second open-faced bearing on the guide rod in a zero-clearance relationship with the guide rod.
    Type: Application
    Filed: October 15, 2007
    Publication date: April 16, 2009
    Inventors: William Michael Connors, Stephen Edward Stewart
  • Publication number: 20080290580
    Abstract: An auto-document feeder re-ingestion stop includes an auto-document feeder having a lower input tray and an upper output tray, the upper output tray having a length which is shorter than the length of input tray so that exiting or exited media depends onto the input tray, a flexible stopper depending from the upper output tray and inhibiting the exited media from being re-ingested by paper-to-paper friction during feeding of media in the input tray.
    Type: Application
    Filed: May 24, 2007
    Publication date: November 27, 2008
    Inventors: William Michael Connors, Walter Kevin Cousins, Stephen Kelly Cunnagin, John Andrew Schmels, Stephen Edward Stewart
  • Publication number: 20080038037
    Abstract: An imaging apparatus includes a printhead carrier for mounting a printhead cartridge. The printhead carrier includes a carrier back wall having an upper portion. A back portion of a printhead cartridge cradle is connected to the carrier back wall. A first proximal end of a latch lever is pivotably attached to a front portion of the printhead cartridge cradle. The latch lever has at least one cam follower, with each cam follower being located near the first distal end of the latch lever. A second proximal end of a carrier lid is pivotably attached to the upper portion of the carrier back wall. Each cam of the carrier lid is formed near a second distal end of the carrier lid, and each cam is positioned for progressive engagement by a corresponding cam follower as the latch lever is moved from an open position toward a latched position.
    Type: Application
    Filed: July 24, 2006
    Publication date: February 14, 2008
    Inventors: David Wayne DeVore, Timothy John Hawryschuk, David Kyle Mursay, Stephen Edward Stewart, Randall MeClay Stoves