Scoring Saw Slots for Timber Yield Optimization
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Solution Overview
Problem
In industrial wood processing, curved trunk profiles and varying cross-sectional dimensions lead to significant wood waste when producing sideboards, as the trunk geometry deviations require excessive wood removal to straighten and shape the trunk for long and wide sideboards.
Innovation Solution
A method and device that involve chipping or sawing a straight side on the tree trunk, milling out wane areas, and using a scoring saw to create slots at an angle, allowing for the production of wider and longer sideboards with reduced wood waste by adjusting the milling tools and scoring saw along inclined axes during the feed movement, enabling diagonal cuts that optimize wood yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the trunk is profiled to match the desired side board profile by removing wood from the outer part, then straight and wide side boards can be produced, but a large amount of wood waste is generated
Solution Approach 1:
The invention applies preliminary action by creating slots in the trunk before the final side board profiling. These slots are positioned strategically to allow the trunk to be shaped into a hexagonal or multi-faceted intermediate form, which then enables more efficient side board extraction with reduced waste material removal in subsequent operations.
Solution Approach 2:
The invention changes the geometric parameters of the trunk by transforming it from a cylindrical shape to a hexagonal or multi-faceted shape through slot creation and selective material removal. This parameter change optimizes the trunk geometry to better match the desired side board dimensions, reducing the need for excessive material removal.
2Length of moving object
If excessive wood is removed to compensate for irregular log geometry, then long and wide side boards can be obtained, but wood yield is reduced
Solution Approach 1:
The slots are created in advance to define the future side board boundaries and to create a geometric intermediate form that preserves more usable wood. This preliminary structuring allows for more efficient subsequent cutting operations that produce long, wide side boards without requiring excessive material removal.
Solution Approach 2:
The invention segments the trunk into distinct geometric zones by creating slots that define hexagonal or multi-faceted sections. This segmentation allows each section to be optimized for specific side board production, maximizing the utilization of available wood volume and reducing overall waste.
3Manufacturing precision
If the trunk is straightened by removing outer wood, then consistent side board dimensions are achieved, but processing time and material loss increase
Solution Approach 1:
By creating slots and forming the hexagonal intermediate shape beforehand, the invention establishes a stable geometric framework that naturally maintains consistent side board dimensions during subsequent processing. This eliminates the need for continuous material removal and re-profiling operations, thereby improving processing efficiency.
Solution Approach 2:
The invention introduces dynamic adaptability by allowing the trunk to be processed in stages - first creating the hexagonal form with slots, then extracting side boards from this optimized geometry. This dynamic approach enables the processing system to adapt to varying trunk shapes while maintaining consistent output dimensions.
Data Source
Figure 1a~1e
Figure 2a~2e
Figure 3a~3e
AI summary
Method for producing sawn timber from a tree trunk (1), in which at least one straight side (5) is produced on the tree trunk (1) by chipping or sawing off a slab (4) and a remaining wane area is milled out by means of milling tools at at least two corner areas (6) adjacent to the straight side, and at least one side board (10) is cut off by a saw cut along a cutting line (9) defined by the corner areas (6), in which, before sawing off the side board (10), one or more slots (7, 8) are cut orthogonally to the straight side (5) by means of a scoring saw (11), the depth of which corresponds at least to the thickness of the side board (10) to be cut off, and in which the corner areas (6) and/or the slots (7, 8) are each placed along a straight line (21) which forms an acute angle (22) with the transport direction (3) of the tree trunk (1),by displacing the milling tools and/or the scoring saw (11) along an adjustment axis (19) during a feed movement of the log (1), the adjustment axis (19) forming an acute angle of inclination (27) with a plane (26) that is orthogonal to the transport direction (3) of the log (1).