a wood processor for felling , delimbing and cutting tree - trunks includes a system of arms containing at least two beams mutually movable in the longitudinal direction , one in the other . the wood processor also includes a unit composed of a delimbing head and a felling head attached to one end of the arm system . at its other end , the arm system is attached to a vehicle , for example a wood tractor , and is arranged substantially horizontally . the whole unit is pivotable about a turning point at one end of the arm system . the delimbing head is attached to the inner beam of the beams in the arm system and the felling head is attached to the outer beam of the beams in the arm system , so that the delimbing head is movably arranged in the longitudinal direction of the beams in relation to the felling head .