G - Physics – 01 – B
Patent
G - Physics
01
B
G01B 11/30 (2006.01) G01B 11/24 (2006.01) G01B 21/20 (2006.01) G01B 21/30 (2006.01) G01N 21/898 (2006.01) G01N 33/46 (2006.01)
Patent
CA 2365654
An apparatus and method for detecting twist in an articles such as pieces of lumber being carried on a high-speed longitudinally moving conveyer use a non-contact scanning technique according to which a pair of transverse scan line beams is directed onto a surface of the article in spaced relationship in the conveying direction, and successive scans of corresponding simultaneously scanned pairs of spaced transverse areas on the article are repeatedly performed while the article is conveyed, to generate profile data characterizing position of each transverse area in a reference system. The profile data characterizing the respective position of both transverse areas is compared with one another to generate partial twist indicative data associated with each scan, followed by a summation of the partial twist indicative data associated with all scans to obtain an indication of the twist in the considered portion of the article. The proposed apparatus and method provide accurate twist measurement even if the article is subjected to some wobbling movement relative to the conveying surface.
Legros Yvon
Lessard Jean-Luc
Mongeau Jean-Pierre
Boudreau Jean-Claude
Centre de Recherche Industrielle Du Quebec
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