Tapered Roll Feed for Lumber Gap Control
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Solution Overview
Problem
Current lumber processing systems face inefficiencies due to sudden acceleration and directional changes, leading to large gaps and collisions between lumber pieces, which reduce processing efficiency and increase the risk of damage and costly repairs.
Innovation Solution
The implementation of a tapered feed roll assembly that gradually accelerates and decelerates lumber pieces, allowing for controlled directional changes without the need for a long intermediate conveyor, by using upper and lower tapered feed rolls with adjustable diameters and angles to manage the flow and orientation of lumber pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional rollers are used for transfer, then directional change and acceleration can be achieved, but large gaps and collisions occur between lumber pieces
Solution Approach 1:
The patent employs curved transition sections and arched conveyor paths instead of straight-line transfers. The lumber pieces follow a curved trajectory during directional changes, which gradually alters their motion direction and reduces sudden impacts and gap formation between consecutive pieces.
Solution Approach 2:
The system uses variable speed control along the conveyor path, with different sections operating at different speeds. The transition zones employ dynamic speed adjustment to match the curvature of the path, enabling smooth acceleration and deceleration that prevents collisions while maintaining throughput.
2Reliability
If a long intermediate conveyor is used to reduce collisions, then collision risk decreases, but system footprint increases
Solution Approach 1:
The patent utilizes three-dimensional spatial arrangement with vertical layering and angled conveyor sections. By transitioning lumber through multiple dimensions (vertical lifts, angled sections, and layered conveyor levels), the system achieves effective deceleration and collision prevention within a compact horizontal footprint.
Solution Approach 2:
The conveyor system employs nested or stacked conveyor sections where multiple transfer stages are arranged vertically or in overlapping configurations. This nesting allows the functional equivalent of a long conveyor to be achieved within a compact space by utilizing vertical and angular arrangements.
3Productivity
If sudden acceleration is applied to lumber pieces, then processing throughput increases, but gaps between pieces increase
Solution Approach 1:
The patent implements continuous contact between lumber pieces and the conveyor surface throughout the transfer process. The curved paths and rolling motion ensure that pieces remain in constant engagement with the conveying mechanism, maintaining uniform spacing and preventing gap formation even during acceleration phases.
Solution Approach 2:
The system performs preliminary acceleration in dedicated transition zones before the main conveying section. By gradually building up speed in curved entry sections, the lumber pieces are prepared for high-speed transport without sudden jerks that would create gaps, ensuring smooth and consistent spacing throughout the process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces the footprint of processing systems, enhances worker safety, and minimizes collisions and gaps between lumber pieces, thereby improving processing efficiency and reducing the risk of damage.
Implementation Method 1
The tapered rolls may be used with infeed and/or outfeed components, such as conveyors/transfers, to efficiently transport workpieces
Data Source
AI summary
The present disclosure provides workpiece feed systems, methods and assemblies comprising one or more tapered feed rolls positioned at an angle to incoming workpieces. The tapered feed rolls may pull individual workpieces toward a guide while gradually accelerating the workpieces and altering their direction of travel. The angle and speed of rotation of the tapered feed rolls may be automatically adjusted to control workpiece speed/acceleration, providing improved gap control and minimizing collisions between successive workpieces. Tapered feed rolls may therefore reduce or eliminate the need for a conventional bridge to decelerate the workpieces after the directional change, reducing the operational space required by a workpiece feed system.