| 摘要 |
The present invention comprises a rotating drum assembly mounted on a framework above a conveyor assembly disposed transversely to the drum, a cross conveyor in the conveyor assembly operable to drivingly feed lumber into a saw assembly. The rotating drum assembly is provided with a multiplicity of groups of wires suitably fastened to the opposite terminal end plates of the drum and a light projecting source suitably mounted in the drum being operable to project light through unit groups of wires passing under the light projecting source in response to rotation of the drum and to project shadow impages of the wires upon lumber traveling on the conveyor therebeneath. The drum assembly also includes a parallax guide suitably fixed inside the rotating drum assembly operable to planarly orient unit groups of wires on the drum as they are caused to pass over the guide in response to rotation of the drum. The wires of each of the unit groups are parallelly spaced apart on the drum a distance geometrically coincident with the spacing of parallel mounted saw blades in the saw assembly. Each unit group of wires on the drum are spaced apart a distance geometrically coincident with the spacing of lumber guide bars on the conveyor assembly. Adjusting means is provided on the drum assembly to interrupt the synchronous drive of the drum operable to selectively align shadow impages on a selected piece of lumber being carried by a respective guide bar on the conveyor. The adjusting means is electrically interconnected to the saw assembly to selectively align saw blades coincident with the shadow line images on the lumber.
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