Multi-Axis Blade Sharpening Fixture with Adjustable Grinder Support
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Solution Overview
Problem
Existing blade sharpening devices lack precise angle adjustment and secure blade positioning mechanisms, particularly for blades with different angles and complex cutting edge contours, leading to inadequate restoration of cutting edges to manufactured specifications.
Innovation Solution
A multi-axis support assembly with a three-way pivot and extensible grinder support arm, combined with a blade holding fixture featuring toggle clamps and an adapter fixture for securing blades at various angles, allows for precise adjustment and secure positioning of blades for effective sharpening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional grinder with fixed position is used, then the device structure is simple, but the blade cannot be securely positioned at predetermined angles for precise sharpening
Solution Approach 1:
The support assembly incorporates multiple pivot points that allow dynamic adjustment of the grinder position and angle. The first pivot enables angular adjustment of the support arm, the second pivot allows extension/retraction movement, and the third pivot provides vertical adjustment. This dynamic positioning system enables precise blade sharpening angles while maintaining a relatively simple overall structure.
Solution Approach 2:
The device allows changing multiple parameters of the grinder position including angle (via first pivot), extension distance (via second pivot), and vertical height (via third pivot). By adjusting these parameters, the blade can be securely positioned at various predetermined angles for precise sharpening of different blade types and cutting edge contours.
2Ease of operation
If the grinder is made stationary, then the device structure is simplified, but the blade cannot be moved into and out of engagement with the grinding wheel
Solution Approach 1:
The support assembly uses a series of pivots that enable the grinder to be dynamically positioned. The second pivot specifically allows the support arm to extend and retract, enabling easy engagement and disengagement of the blade with the grinding wheel while keeping the grinder itself stationary on the support arm.
Solution Approach 2:
The support assembly is divided into multiple segmented components connected by pivots. This segmentation allows independent movement of different parts - the blade can be engaged/disengaged via the extendable support arm while the main grinder body remains stationary, simplifying the overall operation.
3Adaptability or versatility
If a single-axis support is used, then the device structure is simple, but the grinder cannot be adjusted to multiple positions and angles for different blade types
Solution Approach 1:
The multi-axis support assembly incorporates three pivots that provide dynamic adjustment capabilities in multiple directions. The first pivot adjusts the angle of the support arm, the second pivot enables extension/retraction for different blade lengths, and the third pivot provides vertical positioning. This multi-axis dynamic system accommodates various blade types and cutting edge contours.
Solution Approach 2:
The multi-axis support assembly serves multiple functions: angular adjustment, extension/retraction, vertical positioning, and secure locking. This universal support structure can accommodate different blade types, sizes, and cutting edge contours, making the device versatile while maintaining a cohesive design.
4Manufacturing precision
If the blade holding fixture lacks secure positioning mechanisms, then the device structure is simple, but the blade cutting edge cannot be maintained at the manufactured specification angle
Solution Approach 1:
The support assembly includes locking mechanisms that provide feedback-based positioning. The pivots can be adjusted to the desired angle and then locked in place, ensuring the blade cutting edge is maintained at the precise manufactured specification angle during grinding. This feedback mechanism prevents drift and maintains accuracy.
Solution Approach 2:
The blade holding fixture allows precise adjustment of the blade position parameters including angle and distance from the grinding wheel. By changing these parameters through the multi-axis pivot system, the cutting edge can be maintained at the exact manufactured specification angle for accurate sharpening.
Data Source
AI summary
An apparatus for sharpening blades, such as those used for mowing. A rotary grinder is mounted within an extensible, retractable, and rotatable support assembly. Lockable, rotational adjustment of the position of the grinder about three axes, and translational movement along one axis is thereby provided. A spring attached to one end of the assembly counter-balances the weight of the grinder. An adjacent blade holding fixture maintains the workpiece at a predetermined angle for grinding. A toggle clamp, edge alignment keepers, and a registration pin secure the blade in place. An adapter fixture, including a toggle clamp and an alignment recess, attaches to one end of the blade holding fixture. The adapter fixture has an angled shelf to orient and secure smaller, contoured blades requiring a different edge grinding angle. Once the support assembly is adjustably secured, the grinder is moved along the cutting edge of the blade for sharpening.