METHODS AND APPARATUS FOR CENTERING A LOG AND FOR SUPPLYING A LOG TO BE CENTERED

摘要

Periphery detectors are arranged being juxtaposed closely, along thelongitudinal direction of the log which is to be rotated one revolution around avirtual center, thereby a plurality of peripheries of cross sections along thelongitudinal direction are detected for the log. The direction of the largest rightcircular cylinder is determined according to the largest inscribed circles for theperipheries of three cross sections (i.e., the ones adjacent to both the ends of the logand the one in the middle of the log) and the largest right circular cylinder itself isdetermined according to the peripheries of all cross sections detected. Thus thecenter line of said largest right circular cylinder is adopted as the turning center.The positions of a pair of inclined beams or swing arms are adjusted for cancelingthe deviation between the turning center and the virtual center. Furthermore, thelargest radius of the log rotation around the turning center is determined from allsaid cross sections detected, and then the planer table is located in the stand in aposition where the planer table never invades said largest radius of log rotation.