Spectacle Frame Bezel Contour Reading with Adaptive Force Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for reading the contour of spectacle frame bezels, especially strongly arched and twisted frames, fail to precisely follow the bezel shape due to inadequate force control, leading to the probe slipping off the bezel, particularly in areas with significant curvature and tilting.
Innovation Solution
A method where the feeler is controlled by exerting a combination of axial and transverse forces, allowing it to maintain contact with the bezel's bottom by varying the overall force direction and magnitude based on the frame's curvature and tilting, ensuring the force axis remains parallel to the bezel's axis of symmetry, even when the frame is strongly arched or twisted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the probe is simply pressed on the bezel orthogonal to its axis of rotation, then the device structure remains simple, but the probe cannot follow precisely the bottom of the bezel in strongly curved and twisted frames
Solution Approach 1:
The patent applies dynamics by making the probe position adaptive rather than fixed. The control system dynamically adjusts the probe position along the first axis based on real-time detection of bezel geometry, allowing the probe to follow the contours of strongly curved and twisted frames. This dynamic adjustment resolves the contradiction by enabling precise measurement without requiring complex mechanical control structures.
Solution Approach 2:
The patent implements feedback control where the detection system continuously monitors the probe's contact with the bezel and feeds this information back to the control system. The control system then adjusts the probe position accordingly to maintain precise contact with the bezel bottom. This feedback mechanism enables high measurement precision while keeping the device structure relatively simple.
2Reliability
If the probe is pressed with constant force on the bezel, then the control system remains simple, but the probe risks leaving the bezel when the frame has significant pouring and inclined side surfaces
Solution Approach 1:
The patent applies dynamics by transitioning from constant force application to dynamic force control. The control system continuously adjusts the probe force based on detected bezel geometry, particularly adapting to frames with significant pouring and inclined surfaces. This dynamic force control ensures reliable probe contact without requiring overly complex mechanical force application mechanisms.
Solution Approach 2:
The patent implements parameter changes by varying the force magnitude and direction as control parameters. The control system adjusts these parameters in response to detected bezel characteristics, enabling the probe to maintain reliable contact across different frame geometries. This parameter-based control achieves high reliability without significant increases in device complexity.
3Measurement precision
If the probe position is controlled by curvature of the trajectory along the first axis, then the control responds to frame curvature, but it does not react effectively to the tilting of the mount in temporal parts of the circle
Solution Approach 1:
The patent applies universality by creating a control system that handles multiple frame geometry types through a unified approach. The control system detects various bezel characteristics (curvature, tilting, pouring) and adapts its probe position control accordingly, making it universally applicable to different frame styles including strongly curved and twisted frames. This multi-functional control achieves high measurement precision across diverse geometries.
Solution Approach 2:
The patent implements parameter changes by adjusting control parameters based on detected bezel characteristics. The system varies probe position, force magnitude, and force direction parameters in response to different frame geometries. This parameter-based adaptability enables precise measurement across various frame types without requiring separate control mechanisms for each geometry.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a method for reading the contour of the bezel of an eyeglass spectacle frame (10) comprising the steps of: placing a follower (8) in contact against the bezel and following the bezel by sliding or rolling said follower along the bezel, the follower being actuated by actuating means at least along a first axis normal to the general plane of the rims of the frame. According to the invention, the global effort provided by the actuating means varies, continuously or in steps, over the reading according to the position (Z) of the follower along the first axis.