Patent ID: 6389941
Filing Date: 2002-05-21
Classification: B26D,F16F,Y10T

Abstract:
A rotary knife for cutting a plurality of individual sheets in succession from a longitudinally traveling continuous web of material, the rotary knife comprising:a frame; a first rotatable knife cylinder and a second rotatable knife cylinder, each of the rotatable knife cylinders having a blade mounted on an outer cylindrical wall of the respective knife cylinder, the blades engaging each other as the knife cylinders rotate to cut the web; and an active vibration damping system for the first knife cylinder including: a lever arm having a first end coupled to the first rotatable knife cylinder and a second end that is freely suspended, a knife vibration sensor that monitors vibration of the first knife cylinder and generates a signal in response thereto, an electric control unit that inputs the signal from the knife vibration sensor and outputs one or more command signals, and an actuator that provides a vibration control force on the lever arm in response to the one or more command signals from the electronic control unit.