Robotic Knife Sharpening With Vision-Guided Edge Profiling
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Solution Overview
Problem
Existing knife sharpening technologies are cumbersome, require skilled operation, and often result in inconsistent sharpening due to the need for precise manual adjustments, leading to inefficiencies in sharpening large numbers of knives, especially in industrial settings.
Innovation Solution
An automated system utilizing a six-axis robotic arm, a pneumatic gripper, and a two-dimensional vision system with camera and software to profile the knife blade, guiding it through a series of grinding, sharpening, and buffing wheels to maintain a sharp edge, while also incorporating a washing station for cleaning and sanitizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual sharpening is performed by skilled operators, then sharpening quality can be maintained, but operator fatigue increases and throughput decreases when handling large numbers of knives
Solution Approach 1:
The patent replaces manual mechanical sharpening operations with an automated robotic system that uses computer vision to guide grinding and polishing wheels. The robotic arm manipulates the knife through multiple sharpening stations with precise control, eliminating operator fatigue while maintaining consistent sharpening quality across large volumes of knives
Solution Approach 2:
The system enables knives to be sharpened automatically without human intervention. The robotic system self-adjusts positioning, applies appropriate grinding pressure, and sequences operations through multiple stations, allowing high-volume sharpening to proceed without operators becoming fatigued
2Manufacturing precision
If precise manual adjustments are made during sharpening, then edge quality improves, but device complexity and operation difficulty increase
Solution Approach 1:
The patent replaces complex manual adjustment mechanisms with an automated robotic system guided by computer vision. The system uses cameras to capture knife geometry, processes the images to determine optimal sharpening parameters, and automatically controls robotic movements and wheel pressures, simplifying operation while maintaining precision
Solution Approach 2:
The system creates a digital copy of the knife blade geometry through vision system imaging. This digital model is used to plan and execute the sharpening process, allowing the system to automatically determine the precise movements and forces needed without requiring complex mechanical adjustment mechanisms
3Manufacturing precision
If multiple sharpening stations are used in sequence, then edge quality improves, but processing time increases
Solution Approach 1:
The patent implements continuous motion through the sharpening process. The robotic arm moves the knife continuously through multiple grinding and polishing stations without stopping between operations. The system coordinates wheel speeds and robotic movement to maintain constant contact and material removal, eliminating idle time between sharpening stages
Solution Approach 2:
The system performs preliminary positioning and alignment of the knife using computer vision before the sharpening process begins. The robotic system pre-calculates the optimal path through all sharpening stations and pre-positions the knife at the correct angle, allowing the actual sharpening operations to proceed without delays for adjustment or repositioning
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
The system enables efficient, consistent sharpening of knife blades with minimal operator skill required, capable of handling multiple knives with improved throughput and reduced operator fatigue, maintaining the original factory edge profile while potentially achieving an even sharper cutting edge.
Implementation Method 1
a two-dimensional vision system with camera and software to profile the knife blade
Implementation Method 2
guiding it through a series of grinding, sharpening, and buffing wheels
Implementation Method 3
An automated system utilizing a six-axis robotic arm, a pneumatic gripper
Data Source
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AI summary
An automated hand tool sharpening and cleaning system for sharpening the two opposed cutting edges of a blade is provided by the invention. The apparatus comprises a six-axis robotic arm, a pneumatic gripper, a vision sensor camera, a robotic controller, and rotating wheel assemblies used to grind, sharpen, and buff or polish the cutting edges of the knife blade. The blade cutting edges are profiled by the camera image that is processed by associated software to determine the blade profile by defining multiple points along the blade edge. The resulting profile data is then translated into a set of machine control commands fed to the robotic arm and pneumatic gripper via the robot controller for manipulating the knife blade edges via the robotic arm with respect to each of the grinding, coarse sharpening, fine sharpening, and buffing/polishing wheels and an associated wash station for remove bits of metal and other residue resulting from the sharpened knife blade.