| 摘要 |
An automatic branch cutting device is disclosed comprising a frame which is capable of being divided into two halves, a branch cutting tool, an elevating means for ascending and descending a tree trunk, an ascending and descending transfer clutch, an engine and a drive means for transferring the movement from the engine to each of the moving parts. The branch cutting tool is preferably a chain saw which will cut off tree branches while revolving on a rotary ring by an engine. The elevating means drives the whole device upward by combining two links, which are equal in length, pantagraphically with a link fitted therewith parallel to the tree trunk. Rollers are fitted with a flexible material on their surfaces at connecting points of the links. By means of a spring, the tip of the parallel link is pushed from the side of the frame to the side of the tree trunk. This spring automatically exerts a component of force to press the rollers against the trunk of a tree by positioning the center of gravity of the side of the frame outside the rollers. The elevating means has a drive mechanism containing a friction clutch by which the speed of revolution and the ascending speed are lowered automatically while a branch is being cut. The drive means automatically reverses the revolution by means of the transfer clutch when the cutting of the branches is complete and then drives the whole device downward.
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