Eyeglass Lens Processing Apparatus High Curve Beveling Control
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Solution Overview
Problem
Existing eyeglass lens processing apparatuses face challenges in processing high curve lenses, where the lens may protrude from the width of the roughing grindstone, leading to potential contact with the finishing grindstone, excess load, axial deviation, or deformation during processing, and require a wider grindstone to prevent these issues, which increases the apparatus size.
Innovation Solution
An eyeglass lens processing apparatus with a lens rotating unit, grindstone rotating unit, X-axis and Y-axis moving units, and a computing unit that adjusts the position of the lens chuck shaft based on target lens shape data and curve data to ensure the lens remains within the width of the roughing grindstone during processing, preventing protrusion and allowing for effective roughing without a wide grindstone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the roughing grindstone is made sufficiently wide to prevent lens protrusion, then the lens can be roughed without protruding from the grindstone width, but the size of the apparatus becomes large
Solution Approach 1:
The patent applies dynamics by making the lens chuck shaft movable in the axial direction of the grindstone rotating shaft. The X-axis moving unit dynamically adjusts the position of the lens chuck shaft based on the lens curve data, allowing the system to adapt to different lens types (high curve vs. low curve lenses) without requiring a fixed wide grindstone width. This dynamic adjustment resolves the contradiction by enabling reliable processing of protruding lenses while maintaining a compact apparatus size.
2Device complexity
If only the axis-to-axis distance between lens chuck shafts and grindstone rotating shaft is controlled, then the processing is simple, but the lens may protrude from the width of the roughing grindstone for high curve lenses
Solution Approach 1:
The patent transitions from one-dimensional control (only Y-axis axis-to-axis distance) to two-dimensional control by adding X-axis movement of the lens chuck shaft. This dimensional expansion allows precise positioning of the lens relative to the grindstone, enabling the system to handle high curve lenses that protrude from the grindstone width while maintaining reasonable device complexity through coordinated dual-axis control.
3Adaptability or versatility
If the lens protrudes from the width of the roughing grindstone, then the processing can accommodate high curve lenses, but the periphery edge of the lens may contact the finishing grindstone or excess load may occur
Solution Approach 1:
The patent implements feedback control by using the lens curve data input unit to detect lens characteristics and the computing unit to calculate appropriate X-axis and Y-axis movement amounts. This feedback mechanism allows the system to adjust the lens positioning in real-time based on the specific lens type being processed, preventing harmful effects such as contact with the finishing grindstone, excess load, axial deviation, and deformation while maintaining adaptability to process various lens curves.
Data Source
AI summary
In an eyeglass lens processing apparatus for beveling a peripheral edge of an eyeglass lens, if the high curve lens processing mode is selected by a mode selector, a computing unit acquires a high curve bevel path for locating the bevel apex on a front surface curve of the eyeglass lens or for locating the bevel apex at a position shifted by a predetermined quantity from the front surface curve toward the rear side on the basis of the edge position information acquired by the edge position detector, thereby providing high curve beveling data for the rear surface beveling grindstone, or for the front surface and rear surface beveling grindstones; and a beveling controller bevels the peripheral edge of the eyeglass lens by the rear surface beveling grindstone, or by the front surface and rear surface beveling grindstones on the basis of the high curve beveling data.