Importance

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Abstract

A flail drum system has an upper rotary chain flail drum and a lower rotary chain flail drum longitudinally downstream from the upper drum. Wood product advancing mechanism on the machine frame moves the logs forwardly while spreading them and creates a downward pressure on the products at a first pinch point. The upper and lower flail drums are each driven in rotation about a generally horizontal axis transverse to the path of the log. There is a vertically fixed log support member longitudinally between the upper and lower flail drums and driven means for engaging and advancing the logs is provided on a vertically movable subframe which mounts the upper flail drum, longitudinally between the flail drums, for creating a downward pressure on the logs passing between the upper and lower flail drums and preventing raising and diving movement of the logs passing between the drums. The flail drums have a central shaft with scalloped rod support and spacer elements providing perimetral openings, through which chain supporting rods extend without engaging the elements, alternately with circumferentially spaced openings through which the rods extend and which support the rods. The chains are arranged in an axially progressive spiral array on the rods.

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First Claim