Patent ID: 6360640
Filing Date: 2002-03-26
Classification: B26D,B65H,Y10T

Abstract:
A method of cutting a ribbon, which comprises:providing a cutting cylinder having a fixed diameter and rotating at an angular velocity; providing a ribbon travelling at a constant velocity; cutting the ribbon into signatures of a desired length with the cutting cylinder rotating at an angular cutting velocity determined by the constant velocity; and changing the angular velocity of the cutting cylinder after the step of cutting in dependence on the equation W=2&CenterDot;Ï€&CenterDot;V&CenterDot;(L-N)N&CenterDot;L&CenterDot;cos&af;(2&CenterDot;Ï€&CenterDot;VL&CenterDot;t)+2&CenterDot;Ï€&CenterDot;VLâ€ƒwith W being the angular velocity of the cutting cylinder, V being the constant velocity of the ribbon, L being the desired length of the signatures, N being a nominal signature length, and t being time.