Size adjustment of corrugated boards in a box making machine

In a box-making machine including a rotary die cutter, the method of resurfacing the blanket of the anvil of the rotary die cutter including the steps of abrading the surface of the blanket with a rotating abrading cylinder engaging the surface of the blanket during box production while the rotary die cutter is cutting or creasing corrugated boards, using the position of the abrading cylinder relative to the anvil to determine how much the speed of the anvil should be changed to compensate for the change in the diameter of the anvil, and wherein during box production while the die cutter is operating on the boards the abrading cylinder through the use of a computer is automatically and repeatedly fed radially into the anvil blanket a predetermined amount and then retracted from the anvil blanket to repeatedly resurface the anvil blanket, change in the diameter of the anvil blanket is automatically computed and the speed of the anvil is automatically changed to compensate for the change in the diameter of the anvil blanket, and wherein the size of the corrugated boards to be cut by the die cylinder is adjusted by inputting in the computer information relating to said die cutter mechanism, and the computer calculates an adjusted anvil speed to cut the corrugated boards to the desired size.

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, a computer for controlling the operation of a motor which rotates the anvil, said computer having means for calculating an adjusted speed of the anvil to cut the corrugated boards to a desired dimension, and means for inputting into the computer information relating to dies on the die cylinder, said information being used by the computer in the calculation of the adjusted anvil speed.

In a rotary die cutter for a box-making machine including a die cutter and an anvil cylinder including a blanket on the surface thereof, the improvement comprising an abrading cylinder mounted for rotation along the anvil cylinder for abrading the surface of the blanket, means including a computer for automatically and repeatedly moving the abrading cylinder radially towards and away from the blanket to bring the abrading cylinder into and out of engagement with the anvil blanket to resurface the blanket during box production while the die cutter is operating on corrugated boards, and means including said computer for automatically determining the position of the abrading cylinder relative to the anvil for calculating the diameter of the anvil and automatically changing the speed of the anvil in accordance with the diameter of the anvil during box production while the die cutter is operating on corrugated boards, said computer having means for calculating an adjusted speed of the anvil to cut the corrugated boards to a desired dimension, and means for inputting into the computer information relating to dies on the die cylinder, said information being used by the computer in the calculation of the adjusted anvil speed.