Patents Assigned to Winkler & Dunnerbier Maschinenfabrik und Eisengiesserei GmbH & Co. KG.
  • Punch device for making window cut-outs
    Patent number: 4537588
    Abstract: A rotary punch device for making window cut-outs in envelopes and cardboard oxes, with a clamping device for clamping a metal foil having a cutting edge etched out of the foil material. Vacuum bores in the cylindrical surface of the rotary punch retain the material for treatment in position while the punched-out portion of the window is initially also retained by a vacuum and blown away by an air blast on completion of the punch operation.
    Type: Grant
    Filed: January 16, 1984
    Date of Patent: August 27, 1985
    Assignee: Winkler & Dunnerbier Maschinenfabrik und Eisengiesserei GmbH & Co. KG.
    Inventors: Gunter Ehlscheid, Heinz-Helmut Frost