Abstract: The present invention relates to an arrangement in a wood handling device, such a wood handling device being constituted at least by a working device (1) and a cutting device (7) connected thereto. The cutting device according to the arrangement comprises a body (8) which includes tree cutting means and means for arranging the cutting device in a working device provided in booms of a forestry machine. Such a working device, in turn, comprises a body (4) and a set of gripping members (2, 3) for gripping one or more tree trunks (5) simultaneously. This arrangement is characterized in that the cutting device is arranged in the working device by connecting means (6) enabling a mutual shift of the bodies of the working device and the cutting device substantially on a plane of motion of the tree trunk cutting means.

Abstract: A chain saw includes a chain arranged on a saw flange (5). The chain saw is usually arranged in a multi-purpose head of forestry machinery by a mounting flange (1) immobile in regard to the multi-purpose head, whereby the chain is rotated by a chain wheel (4) controlled by a power unit. In order to tighten the chain, the saw flange, or a relevant part of the chain saw comprising the same, is arranged to move parallel with the longitudinal axis (A) of the saw flange in regard to the chain wheel. This is achieved by a tightening device and at least one supporting guide therein which are attached to the mounting flange of the chain saw or a structure arranged therein. By arranging the supporting guide in the tightening device to extend onto both sides of the center of the chain wheel parallel with the longitudinal axis of the saw flange, the saw flange is made to move in a completely supported manner parallel with its longitudinal axis in regard to the chain wheel.