Patents by Inventor Stephen J. Fedigan

Stephen J. Fedigan 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: 20020196308
    Abstract: A print head motor control system uses a desired function of print head position versus time and a measured print head position to form an error signal. The print head controller forms a motor drive signal from the sum of a first term corresponding to the square root of the absolute value of the error signal and a second term corresponding to a dead band signal having a predetermined slope if said error signal exceeds a predetermined value. The desired function of print head position versus time may be formed by double integrating a desired function of print head acceleration versus time. The print head motor control preferably also includes a velocity loop subtracting a print head velocity estimated from the measured print head position from the sum. The print head motor control is preferably implemented using a microprocessor.
    Type: Application
    Filed: May 8, 2002
    Publication date: December 26, 2002
    Inventors: Charles P. Cole, Stephen J. Fedigan