Patent ID: 6925923
Filing Date: 2005-08-09
Classification: B26D,Y10T

Abstract:
1. A cutting machine having a rotary support cylinder, a cutting die board removably attached to said cylinder, and a clamping mechanism mounted on the rotary support cylinder for securing the cutting die board to the periphery of the cylinder, said clamping mechanism comprising: an elongate clamping bolt supported for movement in the longitudinal direction thereof, the bolt having an enlarged head at one end thereof adapted to project through a clearance opening formed in the cutting die board; a two-way activating device connected to the clamping bolt for effecting longitudinal movement thereof in an extending direction toward an extended disengaged position wherein the head of the clamping bolt is disposed outwardly of the rotary cylinder and in a retracting direction toward a retracted position wherein the head of the clamping bolt is positioned within the rotary cylinder or an intermediate engaged position for engaging and holding the cutting die board on the cylinder; said activating device including first and second fluid-pressure biasing arrangements cooperating with and acting oppositely on a longitudinally movable activating member for urging the clamping bolt toward the extended and retracted positions respectively; a control for selectively activating at least one of said biasing arrangements only when movement of said clamping bolt toward the respective position is desired; and a low-force releasable slip coupling connected between said clamping bolt and said activating member and permitting relative longitudinal movement therebetween when the longitudinal force applied to the slip coupling when the bolt is moving in the extending direction exceeds a defined force of small magnitude.