Cutting – With receptacle or support for cut product
Patent
1998-06-17
2000-08-22
Rachuba, M.
Cutting
With receptacle or support for cut product
83428, 83471, 834771, 834772, 83486, 83928, B26D 700
Patent
active
061054771
ABSTRACT:
A portable sawmill is described that preferably includes a frame-mounted, elongate tub for surrounding a log, the frame mounting adjacent the base of the tub a lateral chain conveyor for rolling the log or advancing it laterally on a frame-mounted lift mechanism for elevating the log as it is ripped by an overhead set of circular saws. The circular saws are double-carriage mounted, with the carriages being a fixed elevation on the frame and with the main and secondary carriages being reciprocally positionable, respectively, along the length and width of the tub above the log. The circular saws preferably include one vertical-swath blade and two vertically separately elevation-adjustable horizontal-swath blades. To one side of the tub, and along the substantial length of the frame, are a plurality of retractable support arms mounted on the frame at a height approximately equal to the elevation of the lateral conveyor at the highest elevation of the lift mechanism. Logs may be lifted as they are processed, and cants produced by such processing may be lifted and moved laterally onto the support arms for further milling. The support arms are automatically retracted from a maximum inward extent to a incrementally, successively retracted position synchronously with lateral movement of the secondary carriage, at the beginning of each of successive passes of the main carriage, to prevent interference between the saw blades and the inward termini of the retractable arms. Structure for spindle-aligning logs, rotating partly squared logs and handling cants while finish milling lumber is described.
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"The Portable Sawmill", Lumber Manufacturing: The Design and Operation of Sawmills and Planer Mills, Ed M. Williston, pp. 272-274.
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