| 摘要 |
PCT No. PCT/SE87/00400 Sec. 371 Date Jun. 24, 1988 Sec. 102(e) Date Jun. 24, 1988 PCT Filed Sep. 7, 1987 PCT Pub. No. WO88/01925 PCT Pub. Date Mar. 24, 1988.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. |
