Polygonal In-Feed Roller Assembly for Deeper Wood Chipper Bite
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Solution Overview
Problem
Existing wood chippers require a fixture for aligning blades on cylindrical rollers, limiting manufacturing efficiency and achieving deep, aggressive bites into wood products, and are not aesthetically pleasing or cost-effective.
Innovation Solution
A wood chipper in-feed roller with seven, eight, or nine planar sides constructed from curved plates slot and tab connected to each other and end plates, eliminating the need for a fixture and enhancing manufacturing speed and aesthetics while providing a more aggressive bite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical roller with blades is used, then the structure is simple, but a fixture is required for aligning blades which increases manufacturing complexity and cost
Solution Approach 1:
The roller is divided into multiple planar sides (seven, eight, or nine) instead of a continuous cylindrical surface. Each side can be independently formed and assembled, eliminating the need for complex fixtures to align blades on a cylindrical surface. The segmented structure allows for simpler manufacturing of each individual side.
Solution Approach 2:
Instead of forming a cylindrical surface and then attaching blades, the invention inverts the approach by creating flat planar sides with blades already integrated or easily attachable. This reversal of the manufacturing sequence eliminates the fixture requirement for blade alignment on curved surfaces.
2Productivity
If a cylindrical roller is used, then the manufacturing process is conventional, but it cannot produce deep and aggressive bites into wood products
Solution Approach 1:
The invention replaces the curved cylindrical surface with flat planar sides. This geometric change allows the blades on each flat side to be positioned at optimal angles for aggressive biting into wood, rather than being constrained by the curved surface of a cylinder. The flat surfaces enable deeper penetration and more effective chip production.
3Manufacturing precision
If a fixture is used for blade alignment, then manufacturing precision can be achieved, but manufacturing time and cost increase
Solution Approach 1:
By segmenting the roller into separate planar sides, blade alignment can be achieved during the formation of each individual side rather than requiring post-assembly adjustment on a complete cylinder. This reduces manufacturing time while maintaining precision.
Solution Approach 2:
The blades are positioned and secured on each planar side during the side formation process itself, rather than requiring a separate alignment step after the entire roller is assembled. This preliminary action eliminates time-consuming fixture-based alignment procedures.
4Strength
If a traditional cylindrical roller design is used, then the structure is conventional, but the aesthetic appeal is limited and strength is reduced
Solution Approach 1:
The replacement of curved cylindrical surfaces with flat planar sides creates a more angular, geometric appearance that is visually distinctive and aesthetically pleasing. The flat surfaces also provide greater structural rigidity and strength compared to thin-walled cylindrical structures.
Data Source
AI summary
An in-feed roller for a wood chipper and a process of making thereof. The roller has seven, eight, or nine perimetric planar sides. It is made by providing a plurality of curved plates equal to the number of sides and a pair of end plates having a plurality of perimetric edges equal to the number of sides. Each curved plate has a side portion for extending between respective edges of the end plates, a knife portion, and a junction portion at the junction of the side portion and the knife portion. First tab and slot connections attach the side portions of the curved plates to the edges of the end plates respectively. Second tab and slot connections attach the terminal edges of the side portions of the curved plates to the junction portions of adjacent curved plates respectively.