| 摘要 |
A sawing process and apparatus cuts a log longitudinally along a radius curve to produce boards. The sawing apparatus includes a continuous flexible band saw blade, provided with teeth at one or both edges. A support exposes a section of saw blade that is curved and stabilized by the use of electromagnetic fields in cooperation with rollers. The saw is then configured to make a cut of a desired thickness in a curve parallel the growth rings of a log, in an arc which minimizes the number of knot defects in the board. With each pass of the log through the saw, or vice-versa, a new arc section is cut, and the log or the saw is rotated and positioned for the next arc section cut. Plural sawing stations may be used in series, and the process may be run bi-directionally when using double-edged saw blades. Once the board sections are cut, they are flattened under pressure in a kiln. Triangular grooves may be cut prior to delivery to the kiln, and adhered together afterwards to facilitate the flattening operation for small radius boards. |
