Determination of thickness of a tree trunk

摘要

Method and device for the determination of a thickness of a cross-section (S) of a tree trunk (30) received in a harvesting assembly (10) comprising a pair of opposite feed wheels (14) engaging with the tree trunk and a delimbing knife (18) abutting against the tree trunk. The mutual position of the feed wheels is detected as a measure of a transverse dimension (D1) of the cross-section of the tree trunk. The position of the delimbing knife (18) in relation to an abutment surface (22) of the tree trunk opposite thereto is detected as a measure of an additional transverse dimension (D2) of the cross-section (S) of the tree trunk, which additional transverse dimension forms an essentially right angle with the first-mentioned transverse dimension. The thickness of the cross-section (S) of the tree trunk is calculated based on the two measures of the transverse dimensions (D1, D2).

主权项

1. A method for the determination of a thickness of a cross-section (S) of a tree trunk received in a harvesting assembly, the method comprising:
engaging the tree trunk with a pair of feed wheels used to feed the tree trunk through the harvesting assembly, with the feed wheels engaging opposite sides of the tree trunk along a first diameter corresponding to a first direction, abutting a delimbing knife against the tree trunk opposite a side of the tree trunk abutting an abutment surface, with the delimbing knife and abutment surface engaging diametrically opposite sides of the tree trunk essentially along a second diameter of the tree trunk corresponding to a second direction perpendicular to the first direction, detecting the positions of the feed wheels relative to one another as a measure of the first diameter of the tree trunk, detecting the position of the delimbing knife in relation to an abutment surface as a measure of second diameter of the tree trunk at right angle to the first diameter, and estimating the thickness of the cross-section of the tree trunk based on the first and second diameters, wherein the thickness is calculated as a diameter value in the form of a mean value of the first and second diameters.