Clamping device for key duplicating machine

A clamping device for a key duplicating machine for clamping at least one of a cylindrical key and a flat key, said clamping device comprising one pair of fixed jaws and one pair of moveable jaws arranged on a base, each moveable jaw being moveable relative to a respective fixed jaw along two horizontal parallel upper and lower guide rods, said fixed and moveable jaws being provided with several vertical semicylindrical notches of different radii on confronting sides thereof in order to form several vertical approximate cylindrical clamping holes for clamping cylindrical keys of different diameters when said moveable jaws are moved toward said fixed jaws;

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• an upright biasing means provided on said base beneath a horizontal portion of each pair of fixed and moveable jaws, said biasing means including a pivotable location stopper arranged on each fixed jaw and each stopper having a horizontal plate portion arranged in a pre-determined level position, said biasing means further including an upright cylinder and a compression spring received in said cylinder for upward biasing of a cylindrical key blank or original key to be clamped against a respective horizontal plate portion of a respective stopper.