Flexible Abrasive Assembly for Electric Sharpeners
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Solution Overview
Problem
Existing electric abrasive sharpeners face issues with slowing or stalling of the motor during sharpening due to varying tool sizes, shapes, and applied forces, leading to uneven sharpening results.
Innovation Solution
The implementation of a flexible abrasive assembly with a radially extending center hub and resilient arms that absorb forces, preventing significant slowdown or motor stall by maintaining abrasive surface speed, utilizing materials like ceramic or plastic for spring-like energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rigid abrasive assembly is used, then the structure is simple and easy to manufacture, but the motor slows down or stalls during sharpening due to varying tool forces
Solution Approach 1:
The abrasive assembly is designed with flexible radial arms that can dynamically adjust their position and absorption capacity based on the force applied during sharpening. This dynamic flexibility allows the system to maintain consistent abrasive speed while adapting to varying tool forces, resolving the contradiction between simple rigid structure and reliable speed consistency.
Solution Approach 2:
The radial arms are designed with specific material properties and geometric parameters (length, thickness, cross-section) that allow them to flex and absorb force within optimal ranges. By carefully controlling these parameters, the assembly maintains abrasive speed consistency without requiring complex manufacturing processes.
2Manufacturing precision
If precise components are used to maintain abrasive element speed, then sharpening quality is improved, but device complexity and cost increase
Solution Approach 1:
The flexible radial arms automatically adjust and absorb excess force during sharpening operations, maintaining abrasive speed consistency without requiring external control systems, sensors, or complex precision components. This self-regulating mechanism achieves high sharpening quality while keeping the device simple and economical.
Solution Approach 2:
The radial arms function as flexible structural elements that passively compensate for force variations during sharpening. This flexible design replaces complex precision control mechanisms with a simple, effective passive compensation system that maintains manufacturing precision without increasing device complexity.
3Reliability
If the abrasive assembly is made flexible to absorb forces, then motor stall is prevented, but the structure becomes more complex
Solution Approach 1:
The abrasive assembly is segmented into multiple radial arms that can independently flex and absorb force. This segmentation distributes the force absorption across multiple simple elements rather than requiring one complex component, preventing motor stall while maintaining structural simplicity.
Solution Approach 2:
The radial arms are designed as flexible structural elements with optimized geometry and material properties. This flexible design provides passive force absorption to prevent motor stall without requiring complex active control systems, achieving reliability enhancement with minimal increase in device complexity.
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 ensures consistent and superior sharpening results by maintaining abrasive surface speed and preventing motor stall across a range of tool sizes and forces applied, enhancing the quality of the sharpened edge.
Implementation Method 1
The flexible hub 32 and arms 34a can comprise a flexible material, such as ceramic, plastic and other materials that can provide a spring-like energy absorbing properties
Data Source
AI summary
An electric sharpener having a pair of abrasive wheel assemblies including energy absorbing hubs mounted a powered drive shaft and further integral flexible radially extending arms affixed to respective outer abrasive rings. A pair of disk abrasives assemblies are also affixed to the powered rotatable shaft and include a pair of flexible metal disks operatively connected to a hub attached to the rotatable shaft.