Movable Grinding Wheels for Rotary Mower Blade Sharpening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotary mower blade sharpening devices require frequent adjustments for maintaining the correct grind angle and often necessitate multiple cycles of sharpening and balancing, which slows down the sharpening process, especially when handling large numbers of blades.
Innovation Solution
A sharpening apparatus with movable grinding wheels that sharpen both cutting edges simultaneously and allow for a free pivoting state to test and correct blade balance without removing the blade, incorporating a tilting mechanism for stress relief and adjustable grinding angles to maintain consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fixed position grinding wheels are used, then the grinding angle can be maintained, but frequent adjustments are required for rotary blade width changes and wheel wear, slowing down throughput
Solution Approach 1:
The grinding wheels are made movable along the blade length rather than fixed in position. This allows the wheels to dynamically adjust to different blade widths and wear conditions while maintaining the correct grind angle, eliminating the need for frequent manual adjustments and improving throughput
Solution Approach 2:
The movable grinding wheel system can accommodate various blade widths and types without requiring separate fixtures or adjustments. The single device performs multiple functions across different blade configurations, reducing setup time and increasing overall productivity
2Manufacturing precision
If the blade is removed for balance checking, then balance can be verified, but the process must be repeated multiple times, slowing down sharpener throughput
Solution Approach 1:
The balancing function is merged with the sharpening operation by providing a free pivoting state within the same device. The blade can be checked for balance immediately after sharpening without removal, and any imbalance can be corrected by selective re-grinding, combining multiple operations into one continuous process
Solution Approach 2:
The sharpening and balancing operations are made continuous rather than intermittent. The blade remains in the device throughout the entire process, with balance checking and correction performed without interruption or removal, eliminating repeated setup and removal cycles
3Productivity
If a straight grinding path is used with movable wheels, then both cutting edges can be sharpened simultaneously, but the wheels must be precisely positioned at selected angles
Solution Approach 1:
The grinding wheels are mounted on movable carriages that can be precisely positioned and locked at selected angles. The dynamic positioning system allows for accurate angle setting while maintaining simplicity through straightforward mechanical adjustment and locking mechanisms
Solution Approach 2:
The complex multi-axis adjustment mechanisms of traditional sharpeners are replaced with a simpler movable carriage system that achieves precise positioning through single-axis movement and angular locking, reducing overall device complexity while maintaining sharpening accuracy
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 enhances sharpening efficiency by maintaining consistent blade angles and balance during the sharpening process, reducing the need for repeated adjustments and improving throughput.
Implementation Method 1
a cam system enables the blade to perform a tilting motion, such that the blade pivots away from the grinding wheel at the end of the straight grind to form a large blend or relief radius
Implementation Method 2
one or more movable grinding wheels are provided. When two grinding wheels are provided, each of the grinding wheels moves along one of the two cutting edges of the blade to be sharpened
Data Source
AI summary
A device and method for sharpening a mower blade are provided, in which a mounting device for mounting a rotary blade having two opposite cutting edges to be sharpened, wherein the mounting device is capable of positioning the blade in a first fixed state and a second, axially pivoting state. One or more grinding head assemblies are each positioned on an opposite end of the blade, wherein the grinding head assemblies respectively grind the two opposite cutting edges to be sharpened. A control system controls movement of the two grinding head assemblies. The mounting device positions the blade in the first fixed state to enable the two grinding head assemblies to grind the cutting edges in a direction substantially parallel to the cutting edges of the blade to perform a straight grind, and then may position the blade in the second axially pivoting state to enable the blade to pivot around its blade rotation axis away from the grinding head assemblies upon completion of the straight grind, thereby forming a curve at the end of each cutting edge. The mounting assembly also holds the blade in a third, freely rotating state in which the blade may substantially freely rotate around its blade rotation axis to enable balancing of the blade after sharpening.