Patent ID: 6173633
Filing Date: 2001-01-16
Classification: B26D,Y10T

Abstract:
A method of cutting varying lengths of a sheet material using a rotary cutting system having a knife roll of a desired size and an anvil roll, without requiring a change of the knife roll, comprising:mounting a drive gear of a desired size on the anvil roll;driving the drive gear with the rotation of the anvil roll;mounting an offset gear of a desired size on a gear shaft in an off-center mounting with the offset gear having an axis of rotation displaced radially from a central axis of the offset gear so that the offset gear rotates at varying rates;engaging the drive gear with the offset gear and driving the offset gear with the drive gear;driving the knife roll with the rotation of the offset gear to cause the knife roll to rotate at varying rates with respect to the rotation of the anvil roll;substantially matching the rate of rotation of the anvil roll with the rate of rotation of the knife roll at a cut-point;urging the offset gear into engagement with the drive gear to enable the offset gear to move with respect to the drive gear as the offset gear is rotated, while maintaining the offset gear in engagement with the drive gear as the offset gear is rotated; andcutting the sheet material into desired lengths.