| 摘要 |
An extended length graded lumber fabrication system features a number of fabrication stages along a substantially continuous fabrication path providi ng high through put fabrication of graded lumber of extended length from low quality raw lumber. The fabrication stages include reject recognition stages, a supply lumber grading stage, a finger jointing stage and a final grading stage for the extended length lumber. The fabrication system is configured in conjunction with the particularities of low quality raw lumber to minimize grade fluctuations, increase grade bandwidth and minimize raw lumber waste during fabrication of extended length graded lumber, which may be used in wooden truss joists. The use of l ow quality raw lumber cut from small diameter tree trunks is environmentally beneficial. It contributes to preserve old growth and to use lighter and environmentally less invasive timber harvesting machinery and techniques.
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