Abstract: A device for continuously stacking layers of pieces of board or lumber has a lower conveyor transporting the layers of lumber at a first substantially constant speed. An upper conveyor haing L-shaped carrying members overlies the lower conveyor with the open ends of the L-shaped members facing rearwardly. The upper conveyor and L-shaped members move at a second substantially constant speed which is slower than the speed of the lower conveyor. The timing of the two conveyors is arranged such that an L-shaped carrying member drops down slightly below the carrying plane of the lower conveyor in front of one of the layers of lumber. Prior to reahing the end of the lower conveyor the layer of lumber is conveyed above a lower leg of the L-shaped member, due to its faster speed, and the lower conveyor is then lowered so that the layer of lumber is deposited upon the L-shaped carrying member.

Abstract: Method and apparatus for trimming and grading lumber during transport thereof along a conveyor through a trimming device in which the lumber is cut at both root and top ends; said method comprising, arranging the lumber transverse a conveyor, initially cutting at the root end, directing the remanent transversely of the conveyor to a stop positioned to intercept the top end thereof and located less than one multiple of a length module unit, directing the remanent in the return transverse direction to one of a plurality of finger members, each located one length module from the other in a row transverse the conveyor, making the first top end cut, turning the remanent about its axis for inspection of all sides thereof and directing the remanent to a second cutter for a final top end cut determined by the number of length module units desired, the selection of length being controlled by adjustable stop means.