| 摘要 |
<p>A device for harvesting trees and brushwood comprises a self-propelled tractor carrying a support frame which is capable of pivoting around a primary vertical axis and a secondary horizontal axis perpendicular to a plane of symmetry of the apparatus. A cutting device, comprising a cutting ring, is fixed to the lower part of the support and means are provided to drive the cutting ring, a pair of claws are carried in a groove provided in the support and an arm is mounted on an upper part of the support for movement around a vertical axis. The cutting device includes two circular co-axial plates axially separated from each other by an axial dimension at least equal to the axial dimension of the cutting ring. The plates are joined together at their outer edges by guide rollers which cover the circular opening of the cutting ring, where driving cogs and a toothed pinion are located. The cutting tools are replaceable and are fixed to the ring on its outer edge by independent locking devices which extend radially toward the outer circumference of the ring and are spaced regularly around the axis of revolution of the ring at at least one level.</p> |
