Powered Sharpener with Controlled Abrasive Belt Deflection
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Solution Overview
Problem
Conventional slack-belt sharpeners often result in non-uniform material removal along the length of cutting tools, such as kitchen knives, leading to incomplete sharpening and rounding of the blade tip due to variations in surface pressure and material take-off rates.
Innovation Solution
The implementation of a tilted angle abrasive belt sharpening method, which involves aligning the cutting edge of the knife at a non-orthogonal angle with respect to the abrasive belt, using a guide assembly and support members to control surface pressures and material take-off rates, ensuring uniform sharpening across the blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional slack-belt sharpener is used, then the sharpening process is simple and quick, but the material removal becomes non-uniform causing incomplete sharpening and rounding of the blade tip
Solution Approach 1:
The support structure is divided into multiple support members positioned at different locations beneath the abrasive belt. Each support member independently supports a specific section of the belt, allowing localized control of belt tension and deflection. This segmentation enables uniform material removal across the entire blade length while maintaining a relatively simple overall device structure.
Solution Approach 2:
Different sections of the abrasive belt are provided with different levels of support through strategically positioned support members. The support members create localized variations in belt tension and deflection characteristics, ensuring that each section of the blade receives appropriate sharpening pressure. This local quality control achieves uniform material removal without requiring complex global control mechanisms.
2Stability of the object's composition
If the abrasive belt is fully supported along its length, then the belt remains stable and flat, but surface pressure varies non-uniformly causing inconsistent material take-off rates
Solution Approach 1:
Instead of continuous support, the abrasive belt is supported at discrete segmented locations by individual support members. This segmentation allows each supported section to maintain stability while creating controlled deflection zones between supports. The result is uniform surface pressure distribution across the belt surface, ensuring consistent material take-off rates during sharpening.
Solution Approach 2:
The support members are positioned to create dynamic deflection characteristics in the abrasive belt during operation. As the blade contacts the belt, the belt naturally deflects between support points, creating optimal contact pressure. This dynamic behavior maintains belt stability while ensuring uniform pressure distribution, resolving the contradiction between stability and pressure uniformity.
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 approach provides a more consistent abrasive belt sharpening process, reducing variations in surface pressure and material take-off rates, resulting in a sharper cutting edge with improved retention of the tip's sharpness and complete sharpening of the cutting edge.
Implementation Method 1
a first portion of the cutting edge is contactingly supported by an edge guide surface while a second portion of the cutting edge is presented against a contact region of the abrasive surface to deflect the flexible member out of the neutral plane
Implementation Method 2
The flexible abrasive member has a front side with an abrasive surface and a back side opposite the front side
Data Source
AI summary
Apparatus and method for sharpening a cutting tool having a blade portion with a cutting edge, such as but not limited to a kitchen knife. In some embodiments, a powered sharpener moves a flexible abrasive member such as a belt or disc along a neutral plane. A support member contactingly supports a back side of the flexible abrasive member at a medial location along the neutral plane. The support member is positioned adjacent a contact region of an abrasive surface on an opposing front side of the flexible abrasive member against which a cutting edge is brought during a sharpening operation. In some cases, the support member is a stationary or moveable support member such as a pin or roller offset from the contact region. In other cases, the support member is a platen that projects forward to support the contact region.