| 摘要 |
A method and apparatus for the production of target rectangular quartersawn and backsawn timber. Other sector based timber sections may be or can be produced. Use of the method enables the introduction of associated systems. Sawing and machining patterns applied are defined relative to chosen or designated radial planes emanating from the longitudinal centre of the log with the primary sawing lines being offset to and parallel to the radial planes. The offset parallel cuts are made from the outside of the log to a chosen or designated or calculated depth in the log. An example embodiment of the invention for the processing of a log involves the making of offset parallel cuts on either side of six evenly spaced radial planes angled at 60 degrees to each other. Other cuts can be made at right angles to offset parallel cuts and on radial planes. Radial cuts, if made, and certain other cuts are usually made after certain sections are separated from and removed from the log. The method is applicable to the small and the large log and provides for the efficient exclusion of core wood from target products and the production of high volumes of timber as close as possible to true quartersawn and true backsawn. The method enables the practical application of taper sawing in small logs maximising strength and stability of sawn product. The method can control or minimise the adverse impact of log growth stresses during production and use. |
