| 摘要 |
A delimbing machine includes an elongate horizontal platform on which full-length trees are placed and along which a blade-carrying carriage is propelled to delimb and then cut the top from a tree stem. The delimbing blades are spring-biased into encirclement of a tree stem and cams mounted on the opposite ends of the platform operate a crank to cause the blades to open to permit a tree to be delimbed to be placed for encirclement by the blades and to permit a delimbed tree to be removed from the blades. The topping blades are also spring-biased toward engagement with the tree stem but are held away from the tree stem by an overcenter linkage which is moved overcenter by a linkage connected to the crank arm for opening the delimbing blades when the delimbing blades reach a predetermined small diameter near the top of the tree stem.
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