Patents by Inventor Stephan Kirchhoff

Stephan Kirchhoff 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).

  • Method and device for controlling a drive unit of a pile-lifting device at a sheet-fed printing machine
    Patent number: 5201509
    Abstract: A method of controlling a drive unit of a pile-lifting device located at a sheet-fed printing machine includes starting-up the drive unit with a first mode of operation selected by an electronic current wherein rated torque is high and rated speed is low for respectively lifting and lowering the pile and, after a given period of time, following the starting-up of the drive unit, switching to a second mode of operation of the drive unit wherein the rated torque is low and the rated speed is high if the speed has exceeded a preset value during a lifting of the pile, and has not exceeded a preset value during a lowering of the pile; and a device for performing the method.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: April 13, 1993
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Stephan Kirchhoff, Helmut Meyer, Christian Thomas