Independent Log Saws With Upstream Precut for Faster Throughput
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Solution Overview
Problem
Existing wood processing systems face limitations in throughput speed due to the depth of cut required by saw modules, which is often hindered by the need to cut through extraneous wood, and there is a trade-off between maximizing throughput and wood volume recovery depending on material costs and processing accuracy.
Innovation Solution
The implementation of a precut module with profilers and circular saws to reduce the depth of cut required at saw modules by removing extraneous material upstream, combined with a scanner/optimizer system to calculate optimal cut patterns that balance throughput speed and wood volume recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If saw modules cut through the entire depth of the log to produce side boards, then wood volume recovery is maximized, but throughput speed decreases due to the time required to cut through extraneous wood
Solution Approach 1:
The cutting process is divided into two independent stages: (1) profilers remove extraneous wood to create a preliminary shape, and (2) saw modules complete the cut through the remaining material. This segmentation allows each component to specialize, with profilers handling material removal and saws handling precise cutting, thereby reducing overall processing time while maintaining wood volume recovery
Solution Approach 2:
Profilers perform preliminary cutting actions upstream to remove extraneous wood before the log reaches the saw modules. This preliminary action reduces the depth of cut required by saws, enabling faster throughput while ensuring that the final cut still produces complete side boards with maximum wood volume recovery
2Productivity
If profilers remove extraneous wood upstream to reduce saw depth of cut, then throughput speed increases, but wood volume recovery may decrease due to removal of potentially usable material
Solution Approach 1:
Profilers are configured to remove only the specific extraneous wood that is not needed for side board production, while preserving the quality and dimensions of the remaining log material. The profiling process targets specific areas (outer surfaces and irregular portions) without unnecessarily removing material that would contribute to final product yield
Solution Approach 2:
The profiler acts as an intermediary component between the raw log and the saw module. It prepares the log by removing extraneous material in a controlled manner, creating an optimized workpiece for the subsequent sawing operation. This intermediary action ensures that saws cut only necessary material, balancing throughput improvement with wood volume preservation
3Manufacturing precision
If multiple independent saws are used to cut through the log, then cutting precision and side board quality improve, but device complexity increases
Solution Approach 1:
Multiple independent saws are merged into a single integrated saw module assembly that processes the log in one coordinated operation. The saws are positioned and synchronized to work together, cutting different portions of the log simultaneously or sequentially without requiring separate processing stations, thereby maintaining precision while managing system complexity
Data Source
AI summary
A precut module with one or more profiling heads and/or circular saws may be provided upstream of a saw module. The precut module may be used to implement a portion of a cut that would otherwise be made by the saw module, thereby reducing the depth of cut required at the saw module. In some embodiments, profiling heads may be used to profile a block that is wider than a desired side board. The block may be cut from the workpiece and sent to the edger. This may provide the same or better wood volume recovery and/or throughput speed than profiling the side board or cutting the side board from a flitch. In some embodiments, cut patterns for the precut module and other machine centers may be calculated and/or selected based on a desired depth of cut at the saw module, desired throughput speed, wood volume recovery, and/or other parameters.