Abstract: A harvester for a forestry machine comprises grapples, a cutting device, trimming devices, and advancement devices for grasping, cutting, trimming, and advancement in the axial direction, respectively of a tree stem. Further, the harvester includes a measurement device for measuring the length of the tree stem and a measurement device for measuring how the transverse dimension of the tree stem varies along its length. The measurement device includes a movable measurement device for contact-free detection of the outer contour of the tree stem, from which the diameter is calculable. The measurement device is located between the trimming device and the advancement device for counteracting dirtying of the measurement device. A method for measuring the transverse dimension of a tree stem is disclosed.

Abstract: A forestry machine with devices for felling, trimming and cutting trees includes a control system with operating devices which are actuable by an operator. The operating devices control the felling, trimming and cutting devices, as well as the movements of the forestry machine. The operating devices are disposed discrete and separate from the forestry machine so that the working environment of the operator is free of the turnings, jolts and vibrations which the forestry machine is subjected to during operation. Preferably, the operator and the operating devices are placed in a load-carrying vehicle on which the forestry machine loads the felled trees. A system for forest felling includes a felling unit and an operating module. The operating module is disposed discrete and separate from the felling unit. Preferably, the operating module is disposed in a load-carrying vehicle which receives felled trees from the felling unit.