Mutliple rip-sawing method and apparatus
OwnerCyrus J. Cornellinventor
Life of this patent
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Abstract
Improved "climb-cut" wood sawing machinery, including a top-arbor, single-arbor gang-blade ripping saw, includes means for controlling the disposition of feed-roll drive chain slack to eliminate accidental high-speed ejection of wood pieces. A feed roll motor drives the first of a series of cascaded chain-driven feed rolls, and a slip clutch also driven by the feed motor applies a retarding torque to the last feed roll of the series. In alternative embodiments disclosed, the retarding torque is instead applied by a brake, a separate hydraulic motor or a separate electric motor.
Claims18
In a wood saw assembly which includes a plurality of feed rolls adapted to feed a piece of wood through a gang of rotating circular saw blades carried on a motor-driven arbor, wherein said feed rolls are cascadedly interconnected in a series sequence by a plurality of endless drive chains to rotate in synchronism, and feed motor means are connected to rotate a first of said feed rolls of said series and through said drive chains to rotate the others of said feed rolls of said series, the combination of means for applying a retarding torque to a last of the feed rolls of said series, thereby to prevent forces imparted to said piece of wood by said saw blades from accelerating said piece of wood in the direction in which said piece is being fed by said feed rolls despite the presence of slack in one or more of said endless drive chains.
In the method of rip-sawing wood which comprises feeding a piece of wood forwardly through a gang of saw blades driven in a direction such that blade forces imparted to said piece of wood tend to urge said piece of wood forwardly, said step of feeding comprising rotatably driving at least one feed roll through a motion-transmitting mechanism to urge said piece of wood forwardly at a predetermined speed, the added step of applying a retarding torque to the motion-transmitting mechanism rotatably driving said feed roll to take up slack in said mechanism, thereby preventing blade forces which do not exceed said retarding torque from forwardly accelerating said piece of wood to a speed greater than said predetermined speed.
A wood saw assembly, comprising, in combination:
- circular saw blade means;
- means for rotating said saw blades;
- feed roll means for feeding a piece of wood in a forward direction through said saw blades, said saw blades being rotated in a direction such that forces imparted to said piece of wood by said saw blades tend to urge said piece in said forward direction;
- motive means;
- motion-transmitting means connecting said motive means to drive said feed roll means;
- and means for applying a retarding torque to a portion of said motion-transmitting means which is connected to said feed roll means, whereby blade forces imparted to said piece of wood will not accelerate said piece of wood in said forward direction unless they exceed a magnitude determined by the magnitude of said retarding torque despite the presence of slack in said motion-transmitting means.
Dependencies are inferred from the claim text.