Methods and apparatus for centering a log and for supplying...

B - Operations – Transporting – 27 – B

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B27B 29/08 (2006.01) B23Q 15/22 (2006.01) B27B 31/06 (2006.01) B27L 5/02 (2006.01)

Patent

CA 2111614

Periphery detectors are arranged being juxtaposed closely, along the longitudinal direction of the log which is to be rotated one revolution around avirtual center, thereby a plurality of peripheries of cross sections along the longitudinal direction are detected for the log. The direction of the largest right circular cylinder is determined according to the largest inscribed circles for the peripheries of three cross sections (i.e., the ones adjacent to both the ends of the log and the one in the middle of the log) and the largest right circular cylinder itself is determined 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 canceling the deviation between the turning center and the virtual center. Furthermore, the largest radius of the log rotation around the turning center is determined from all said cross sections detected, and then the planer table is located in the stand in a position where the planer table never invades said largest radius of log rotation.

Des détecteurs périphériques sont placés à faible distance les uns des autres le long d'une grume à laquelle on fait faire une révolution autour d'un axe de rotation théorique afin de déterminer le contour et la section de la grume à une série d'endroits espacés longitudinalement. La position du plus grand cylindre est déterminée d'après le plus grand cercle s'inscrivant dans trois sections (c'est-à-dire les sections prises aux deux bouts de la grume et une autre en son milieu) et le plus grand cylindre est lui-même déterminé en fonction du contour de toutes les sections détectées. Cela fait, on adopte comme centre de rotation l'axe de ce cylindre. Les positions d'une paire de flèches inclinées ou bras oscillants sont ajustées de manière à éliminer l'écart entre le centre de rotation et l'axe de rotation théorique. Par ailleurs, le plus grand rayon de la grume tournant autour du centre de rotation est déterminé à partir de l'ensemble des sections détectées et la position de la table de déroulage est réglée de manière qu'elle ne coupe jamais le plus grand rayon de la grume.

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