Crosswise Abrasive Belt Sharpening Device with Dynamic Support
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Solution Overview
Problem
Existing sharpening devices with movable abrasive belts fail to easily achieve a convex cutting edge profile, requiring operator dexterity and multiple adjustments to obtain the desired curved cutting profile.
Innovation Solution
Incorporating support means, such as a support roller with an off-centered cylindrical active surface, that alternately varies the angle of the sharpening dihedral during movement, allowing automatic adjustment of the blade's angle to achieve a convex edge profile through simple movements in the median plane of the sharpening dihedral.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed support means are used at the underlying dihedral, then the structure is simple and stable, but the sharpening angle cannot be adjusted automatically to obtain a convex cutting profile
Solution Approach 1:
The support means is transformed from a fixed static structure to a dynamic movable structure. The support roller is positioned on a guide rail that allows it to move along the abrasive belt's path, enabling automatic adjustment of the support point position and sharpening angle during operation, thus achieving convex profile without requiring multiple fixed adjustment positions
Solution Approach 2:
A guide rail is introduced as an intermediary element between the fixed structure and the movable support roller. The guide rail constrains the support roller's movement to a specific path while allowing smooth translation, mediating between the stationary device frame and the dynamically positioned support point to achieve controlled angle variation
2Manufacturing precision
If multiple support rollers with adjustments are provided, then the convex profile can be obtained through successive adjustments, but the operation becomes complex and time-consuming
Solution Approach 1:
The support roller system performs self-adjustment through its mechanical interaction with the moving abrasive belt. As the belt moves and flexes under the support roller, the roller automatically follows the belt's contour changes, providing continuous self-adjustment of the support point without requiring operator intervention for angle modifications
Solution Approach 2:
The support roller exhibits periodic reciprocating movements as it follows the abrasive belt's periodic flexing and tension changes during operation. This periodic action creates the necessary angle variations to form the convex profile through repeated cycles of support point adjustment, eliminating the need for manual successive adjustments
3Device complexity
If the support roller is fixed in position, then the device structure is simple, but the sharpening angle remains constant and cannot produce convex edges
Solution Approach 1:
The support roller is merged with the guide rail system to create a unified movable support assembly. The guide rail and support roller work together as an integrated unit where the rail provides the movement path and the roller provides the support function, combining simplicity of structure with adaptability through the coupled movement mechanism
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 automatic generation of a convex or shell-shaped cutting edge profile with high frequency reciprocating movements, enhancing the ease and precision of sharpening operations without the need for multiple adjustments.
Implementation Method 1
a support roller whose active surface is cylindrical, which support roller is mounted to rotate around an axis off-centered relative to the axis of said cylindrical active surface
Implementation Method 2
at least two movable abrasive belts each provided with an active abrasive top surface and a bottom surface
Implementation Method 3
the operation requires experience and good dexterity to obtain the desired cutting profile
Data Source
Figure 1~3
Figure 4~5
Figure 6~9
AI summary
The present invention relates to a sharpening device (1) for a blade of a cutting tool such as a knife or similar, which sharpening device comprises at least two moving abrasive belts (2; 3, 4), each having a top active abrasive surface and a bottom surface, which belts (2; 3, 4) are longitudinally offset and arranged crosswise to form a crossing line (8) defining, on one side, a sharpening dihedron (9) formed by said moving top surfaces of said belts (2; 3, 4), and on the other side, an underlying dihedron (10) formed by said moving bottom surfaces of said belts (2; 3, 4). In accordance with the invention, said sharpening device comprises means (15) of bearing against one of said bottom surfaces of said belts (2; 3, 4), at said underlying dihedron (10), which bearing means (15) are able to vary the angle of said sharpening dihedron (9) in an alternating manner, during the movement of the belts (2, 3, 4).