Contactless Blade Sharpness Detection Using Optical Reflection
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Solution Overview
Problem
Existing methods for sharpening blades lack accuracy in determining blade sharpness during the sharpening process, often leading to inconsistent results and unnecessary material removal, as they fail to provide a contactless and comprehensive sharpness testing solution that prevents ambient light interference.
Innovation Solution
A system that combines a blade positioning and guidance mechanism with an optical inspection unit for contactless sharpness detection, integrated within a single device for both sharpening and testing, utilizing light-blocking bodies to prevent ambient light from entering the sharpness sensing volume and a pivotable support structure for precise blade positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional haptic methods or test object cutting are used to estimate sharpness, then sharpness can be assessed, but the method is subjective, requires user skill, and may damage the blade or present safety risks
Solution Approach 1:
The patent replaces mechanical contact-based sharpness testing (haptic methods, cutting test objects) with an optical sensing system that uses light reflection properties to measure blade sharpness. The optical sensor detects changes in light reflection patterns as the blade edge approaches, providing an objective, non-contact measurement that eliminates subjectivity and potential blade damage.
Solution Approach 2:
The patent introduces an optical sensor as an intermediary between the blade and the measurement process. Instead of direct mechanical contact or subjective human assessment, the optical sensor mediates the measurement by detecting optical properties (light reflection) that change with blade sharpness, providing consistent and repeatable measurements.
2Device complexity
If ambient light is allowed to enter the sharpness sensing volume, then the system structure remains simple, but the optical sharpness sensing accuracy deteriorates due to light interference
Solution Approach 1:
The patent creates an optically controlled environment (inert atmosphere equivalent for light) by using light-blocking walls to prevent ambient light from entering the sensing volume. This isolates the optical measurement from external light interference, ensuring accurate detection of the blade's optical properties without contamination from extraneous light sources.
Solution Approach 2:
The patent extracts or removes ambient light from the sensing environment by implementing light-blocking structures. By preventing external light from entering the sensing volume, the system eliminates the harmful factor (ambient light interference) while maintaining the core measurement function.
3Manufacturing precision
If sequential sharpening stages (rough grinding, fine grinding, polishing) are used, then blade sharpness can be progressively improved, but it is difficult to determine when to transition between stages, leading to excessive material removal or insufficient sharpening
Solution Approach 1:
The patent implements a feedback mechanism where the optical sensor continuously monitors blade sharpness during the sharpening process. This real-time feedback allows the operator to objectively determine when the blade has reached the desired sharpness level for each stage, enabling precise transition points between sharpening stages and preventing both over-sharpening (excessive material removal) and under-sharpening.
Solution Approach 2:
The patent performs preliminary assessment of blade sharpness before and during each sharpening stage using the optical sensor. This allows the operator to plan and execute transitions between sharpening stages more efficiently, knowing exactly when each stage is complete and when to proceed to the next stage, thereby optimizing the overall sharpening process time.
4Measurement precision
If contact-based positioning mechanisms are used to guide the blade, then positioning accuracy can be achieved, but the cutting edge may be damaged by mechanical contact
Solution Approach 1:
The patent replaces mechanical contact-based positioning with an optical sensing system that measures blade position and sharpness without physical contact. The optical sensor detects the blade's presence and characteristics through light reflection properties, eliminating the risk of cutting edge damage from mechanical contact while maintaining positioning accuracy.
Solution Approach 2:
The patent introduces light as an intermediary for positioning and measurement. Instead of mechanical contact between the positioning mechanism and the blade, light serves as the mediator that carries information about the blade's position and sharpness to the sensor, providing a non-contact measurement method that protects the cutting edge.
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
Enables accurate and efficient blade sharpening by continuously inspecting sharpness over the blade's length, minimizing material removal and avoiding damage to the cutting edge, while providing a visual output for user guidance.
Implementation Method 1
an optical inspection unit operative to inspect blade sharpness optically
Implementation Method 2
first and second light-blocking bodies retained in opposition to prevent passage of ambient light through the sharpness inspection slot and into the sharpness sensing volume
Data Source
AI summary
A blade sharpening and blade sharpness detection system for permitting blade sharpening and a determination of blade sharpness without mechanical contact with the blade cutting edge. An optical inspection unit inspects blade sharpness optically, and a blade positioning and guidance mechanism positions and guides the blade in relation to the optical inspection unit. An output display provides visual output of blade sharpness. The optical inspection unit, which can be a reflective optical sensor, and the blade positioning and guidance mechanism are retained by a pivotable support structure. The positioning and guidance mechanism can comprise first and second pairs of rotatable spheres, each such pair disposed in immediate juxtaposition to act as rolling supports for the blade. The entry of ambient light into the sharpness sensing volume can be prevented by resiliently deflectable light-blocking bodies retained to first and second sides of a sharpness inspection slot within the housing.