Abstract: A feller device for felling and delimbing of tree trunks, as well as a delimbing blade device for delimbing of tree trunks, is disclosed. The delimbing blade device comprises: a delimbing blade having a cutting edge for delimbing of a tree trunk; a first joint, by means of which the delimbing blade can be connected to the felling device in a rotatable manner; a cylinder actuator, by means of which the delimbing blade can be moved into at least two different positions; and a second joint, by means of which the cylinder actuator is coupled to the delimbing blade. In a first example, the cylinder actuator can be placed almost parallel to a line extending via the first joint and the second joint so that the cylinder actuator and a third joint belonging to the same cylinder actuator for connection are placed in the area between the first and the second joint.

Abstract: The invention relates to a harvester head that comprises the frame of the harvester head to be connected to the end of the hoist boom of a forest machine, a feeding device for moving a tree trunk, a front blade and/or upper delimbing blades before the feeding device, a cutting device for cutting trunks after the feeding device, as well as a lower delimbing blade between the feeding device and the cutting device, installed on the side of the cutting device in the frame of the harvester head. In the harvester head according to the invention, the lower delimbing blade is arranged to turn into a delimbing position around the tree trunk and into a space-saving position between the outer surface of the tree trunk and the frame of the harvester head, away from the path of the tree trunk.