Woodworking – Process – Mechanical cutting or shaping
Patent
1986-10-27
1987-09-01
Bray, W. D.
Woodworking
Process
Mechanical cutting or shaping
83446, 834411, 144242F, 144253H, B27B 100, B27B 2502
Patent
active
046901884
ABSTRACT:
The present invention is the combination of a linebar and saw assembly for sawing cants or logs having various amounts of sweep in order to maximize the yield. The linebar is conformable between a straight line and a line which approximates an arc of a circle. Both ends of the linebar are positioned relative to the saw so that one end is essentially adjacent to the center of the saw. Both ends of the linebar always remain on the line defined by the linebar when it is in straight line position. A tangent to the end of the linebar adjacent to the saw is always parallel to the plane defined by the saw. The saw is skewable about the point of intersection of the end of the linebar with a line drawn from the centerline of and normal to the plane of the saw. A mechanism for bending the linebar and skewing the saw completes the invention. Using this invention the linebar can be configured into an arc which approximates the sweep curvature of a cant or log being sawn. As the linebar is bent the saw is skewed to maintain parallelism with the line of tangency. The invention is particularly well adapted for use in sawmills where space is limited and where there may not be room to use a variable curve linebar which is deflected only at one end. Improvements of lumber recovery to about 20% are achieved by sawing around the curve as compared with processing similar sweepy cants by straight line sawing.
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Bray W. D.
Weyerhaeuser Company
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