Patent ID: 6913566

Claim:
In a rotary die cutter for cutting and/or creasing corrugated boards in a box-making machine, wherein the rotary die cutter includes a rotatable die cylinder having at least one cutting die, and a rotatable anvil against which the corrugated boards are cut as they pass between the die cylinder and anvil, the method of adjusting a length dimension to be cut on the board by the die including the steps of using a computer for determining how much the speed of the anvil should be changed to cut the board at a desired length dimension, and wherein the method further includes providing an information input to the computer representative of the specific die used on the die cylinder and for the purpose of calculating with the computer an adjusted speed of the anvil to cut the board at the desired length dimension, and sending a signal with the computer to a motor for changing the speed of the anvil to the adjusted speed calculated by the computer and wherein the computer calculates the adjusted speed according to the following formula: RPM_AA = ( 1 + K × S ) × ( RPM_D × DIA_D ) DIA_A Where: RPM_AA is the adjusted speed (in rpm's) speed of the anvil to be calculated K is an integer and takes values from negative 50 to positive 50 and is the number input into the computer by the operator S is the constant 0.0006 RPM_D is the rotational speed of the die cylinder in revolutions per minute DIA_D is the running diameter of the die cylinder in inches DA_A is the diameter of the anvil cylinder in inches.