Woodworking – Process – Timber harvesting or processing
Patent
1994-12-16
1996-07-23
Bray, W. Donald
Woodworking
Process
Timber harvesting or processing
83 15, 83 16, 83879, 83881, 144340, 144364, 144367, 144380, 144357, 144 21, 1442081, 1442086, 2191216, B27L 100, B23K 2600
Patent
active
055380565
ABSTRACT:
High powered lasers are used to score the bark on logs before they are mechanically debarked. Typical of the lasers employed are multi-kilowatt CO.sub.2 industrial lasers. A high powered laser beam is brought to a focus just above the surface of the bark on the log. A jet of compressed air is blown coaxially with the beam and facilitates the beam's formation of a narrow slot in the surface of the bark. Logs are advanced and rotated by a plurality of parallel augers extending across the base of a trough. The lasers are positioned in a gap beneath and in between sets of augers. The beam's focus may be adjustable with respect to the bark's surface. The motion of the log with respect to a laser head produces a spiral cut along the surface of the log which slices the long fibers in the bark,
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Beloit Technologies Inc.
Bray W. Donald
Campbell Raymond W.
Veneman Dirk J.
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