Patent ID: 7225843
Filing Date: 2007-06-05
Classification: B27L

Abstract:
1. A method of cutting a wood block for production of veneer by a rotary veneer lathe equipped with a knife carriage and a support for rotatably supporting the wood block, said knife carriage having a veneer peeling knife having a cutting edge, a number of rotatable peripheral drive wheels disposed at a spaced interval in parallel relation to said cutting edge of the veneer knife and each having on the circumferential periphery a number of tooth-like projections pierceable into peripheral surface of the wood block adjacent to the cutting edge of the veneer knife for driving the wood block from the periphery thereof for rotation about its axis, said peripheral drive wheels being movable relative to said knife carriage, a first drive for rotating said peripheral drive wheels, a second drive for moving said peripheral drive wheels relative to said knife carriage, a pressure member disposed adjacent to the peripheral drive wheel for pressing against the peripheral surface of the wood block, a guide member disposed adjacent to the peripheral drive wheel for guiding veneer peeled from the wood block along the peripheral drive wheels, and a separating member disposed downstream of said guide member with respect to the direction of rotation of said peripheral drive wheels for separating the veneer from the peripheral drive wheels, either one of said knife carriage and the wood block being moved toward the other such that said veneer knife on the knife carriage cuts into the peripheral surface of rotating wood block for peeling veneer therefrom, said method comprising: cutting the wood block with the peripheral drive wheels placed at a first position where the projections of the peripheral drive wheels pierce the peripheral surface of the wood block adjacent to the cutting edge of the veneer knife and the veneer peeled from the wood block and moving past said guide member is pierced by the projections to such an extent that substantial splits are formed in the veneer along wood grain thereof by a force of the projections acting on the veneer, and cutting the wood block with the peripheral drive wheels placed at a second position where the projections of the peripheral drive wheels pierce the peripheral surface of the wood block adjacent to the cutting edge of the veneer knife and the projections of the peripheral drive wheels provide no such force to the veneer peeled from the wood block and moving past said guide member that causes the substantial splits in the veneer along wood grain thereof.