| 摘要 |
<p>An apparatus (10) and method for detecting twist in an articles such as pieces of lumber (14) being carried on a hAn apparatus (10) and method for detecting twist in an articles such as pieces of lumber (14) being carried on a conveyor (12) use a non-contact scanning technique according to which a pair of transverse scan line beams (45, 45') is directed onto a surface (40) of the article in spaced relationship, and successive scans of corresponding simultaneously scanned pairs of spaced transverse areas (38, 38') on the article are repeatedly performed while the article (14) 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.</p> |
