Abstract: A feeding device for longitudinally feeding a tree stem comprises a breast part (2, 2') to be applied against the stem, and two separate feeding units (3, 3'), suitably in the form of endless chains which are movable towards and away from each other, such that they can be pressed against opposite sides of the stem. Each feeding unit is mounted on a holder (7) which is connected to a frame (1) carrying the breast part, by means of a parallel arm system comprising two arms (8, 9) each connected to the holder (7) and the frame (1) by joints 10, 11, 12, 13) whose axes of rotation extend at an acute angle to the axes of rotation of the feeding units. A piston and cylinder assembly (14) is mounted in a conventional way between diagonally opposite joints in the parallel arm system for pivoting the arms relative to the frame for automatically centering the device relative to the tree stem irrespective of varying stem diameters.

Abstract: Apparatus for suspending a tree felling and gripping unit on a jib, the unit having a frame, and the apparatus including a rotator between the jib and a felling and gripping unit for rotation of the unit relative to the jib, the rotator having a stationary portion and an inner portion rotatable about an axis, the rotatable portion having a lower end; a horizontal axle pivotally suspending the stationary portion of the rotator from the jib; a first hydraulic device connected between the jib and the stationary portion of the rotator for swinging the rotator about the horizontal axle; a further axle extending perpendicularly to the rotation axis of the rotatable portion of the rotator and pivotally suspending the frame of the unit from the lower end of the rotatable portion of the rotator; and a second hydraulic device connected between the rotatable portion of the rotator and the frame of the unit for swinging the unit about the further axle.