| 摘要 |
PCT No. PCT/EP87/00137 Sec. 371 Date Apr. 29, 1988 Sec. 102(e) Date Apr. 29, 1988 PCT Filed Mar. 10, 1987 PCT Pub. No. WO87/05555 PCT Pub. Date Sep. 24, 1987.A tree trunk is fed to a cutting station along a centerline line by a plurality of groups of centering rolls spaced along the centering line. Some rolls are driven to advance the trunks. The groups of rolls are adjustable from a centering mode to a non-centering mode by either retracting the rolls or unloading the rolls. During the advancement of a trunk successively through the roll groups, the groups are successively adjusted between their centering and non-centering modes such that roll groups located to support front and rear ends of the trunk are in their centering modes, while at least one roll group disposed therebetween is in its non-centering mode.
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