Patents by Inventor David Upton Johnson

David Upton Johnson 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).

  • Variable speed signature collating apparatus
    Patent number: 6082724
    Abstract: An apparatus (20) for forming sheet material assemblages comprises a conveyor assembly (22) having a plurality of locations (60) for receiving sheet material articles. A sheet material article feeder (54) feeds sheet material articles to the receiving locations (60) in the conveyor assembly (22). Each of the sheet material article feeders has an associated individual drive motor (86) for driving a sheet material feeder element, such as drum (93). A feeder sensor assembly (103) provides a signal indicative of the operative position of the feeder element or drum (93). A receiving location sensor assembly (59) provides a signal indicative of the position of a sheet material receiving location (60) approaching a sheet material article feeder. A sheet material feed controller (80) controls the sheet material feed element (93) in response to signals from the feeder sensor assembly (103), the receiving location sensor assembly (59), and a main controller (40).
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: July 4, 2000
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Daniel Lee Kahlig, David Upton Johnson