| 摘要 |
This invention relates to a tree pruning machine comprising a frame in a cutting unit having a first member mounted to a body having wheels elevating vertically, and a second member projecting from the top of the first member forwardly in an ascent gradient and forming a recess at the front side, the first member having drive wheels mounted on the lower portion thereof and driven by an engine, and a saw chain rotated by the engine through the drive wheels along the frame formed by the first and second members for cutting a branch of a standing tree. Furthermore, the tree pruning machine includes a branch sensing member telescopically provided in the lengthwise direction of the second member of the cutting unit, the front of the sensing member projecting forwardly of the second member for temporarily stopping the drive of the pruning machine toward the upward direction of the standing tree. The sensing member of the pruning machine can reliably sense the branch to be contacted with the top of the cutting unit and the sensing member does not abstruct the pruning machine from climbing the standing tree. Thus, the pruning machine can climb the standing tree without fail even when the cutting unit makes contact with the branch of the tree. |
