Abstract: A forest working machine, as well as a method for controlling the position of a knuckle boom crane during movements of the forest working machine, wherein the method comprises at least the following steps: driving the forest working machine, which comprises a front frame, a rear frame, a joint between said frames, allowing the swivelling of said frames in the lateral direction during the driving, a knuckle boom crane connected on the front frame to a swivelling device which makes it possible to turn said crane around the vertical axis and thereby to change its rotary position; changing the position of the forest working machine during the driving in such a way that the angular position between the front frame and the rear frame is changed; controlling said swivelling device automatically during the driving in such a way that when said angular position is changed, said rotary position is also changed, when said rotary position or its change is also dependent on said angular position or its change.

Abstract: A method and apparatus which permit a tree fetching member to continuously feed trees to harvesting apparatus without waiting for a previously deposited tree to be handled is characterized by having a single member function both as a means for lifting a tree to the handling line from a temporary holding location in the apparatus, below the handling line, and also as a lopping or delimbing knife. This lopping knife, which is rotatable about a horizontal, longitudinal axis, raises one tree at a time over its turning axis to the handling line. Then, acting as a feeding member, it takes part in the lopping operation in conjunction with other lopping knives which are intended for lopping only. The rotatable lopping knife is the sole means for raising a tree to the handling line.