Patents by Inventor Andrew D. MacKay

Andrew D. MacKay 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).

  • Rotary knife control
    Patent number: 4497229
    Abstract: A cylindrical, rotating knife is positioned to cut a moving body of flat sheet into predetermined lengths. An electric motor rotates the cylindrical knife. The knife motor is controlled by a system responsive to the travel of the sheet passing under the knife and the rotation of the knife, itself. The two measurements are fed to a control circuit to produce an output analog electrical signal to the knife motor which varies the rotational speed of the knife during the cutting cycle to avoid wastage of the sheet as it is cut.
    Type: Grant
    Filed: September 24, 1982
    Date of Patent: February 5, 1985
    Assignee: Combustion Engineering, Inc.
    Inventors: Donald P. Carrington, Andrew D. MacKay