Eyeglass Frame Measurement with Segmented Clamp Pins
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Solution Overview
Problem
Existing eyeglass frame measurement apparatuses face challenges in holding frames with varying shapes and sizes due to long clamp pins, which interfere with the tracing stylus during measurement, especially when measuring frames with small vertical widths or high curvature.
Innovation Solution
The eyeglass frame measurement apparatus features a frame holding mechanism with upper and lower sliders and short clamp pins, where the contact portions are designed to be movable and only partially in contact with the rim, allowing for stable holding and reduced interference with the tracing stylus, even when measuring narrow frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the length of clamp pins is made long to clamp rims having various shapes, then the clamping capability is improved, but the tracing stylus interferes with the clamp pins during measurement
Solution Approach 1:
The clamp pin is divided into two functional parts: a clamping portion that contacts the rim and a support portion that extends to the slider. This segmentation allows the clamping portion to be short (avoiding interference with the tracing stylus) while the support portion provides structural support and positioning functionality.
Solution Approach 2:
The clamp pin is designed to protrude from the slider in a direction perpendicular to the measurement reference plane, utilizing the vertical dimension. This spatial arrangement allows the clamp pin to provide clamping force from above/below without interfering with the horizontal movement of the tracing stylus along the rim groove.
2Stability of the object's composition
If the length of clamp pins is made long to ensure stable holding, then the holding stability is improved, but the measurable vertical width of the frame is limited
Solution Approach 1:
By separating the clamp pin into a short clamping portion and a support portion, the design enables stable holding through the support portion's connection to the slider while the short clamping portion does not restrict the vertical measurement range.
Solution Approach 2:
The support portion acts as an intermediary element that transfers the clamping force from the clamp pin to the slider, providing stable holding without requiring the clamping portion to be long. This intermediary structure decouples the holding stability function from the measurement space constraint.
3Adaptability or versatility
If the length of clamp pins is made long to clamp various frame shapes, then the adaptability is improved, but the tracing stylus or its base interferes with the clamp pins during measurement
Solution Approach 1:
The clamp pin is segmented into a clamping portion and a support portion, where the clamping portion is kept short to avoid interfering with the tracing stylus or its base, while the support portion provides structural support and adaptability for various frame shapes.
Solution Approach 2:
The support portion serves multiple functions: providing structural support, enabling the clamp pin to adapt to various frame shapes through the slider mechanism, and positioning the clamping portion at the appropriate location without requiring the entire clamp pin to be long.
Data Source
AI summary
An eyeglass frame measurement apparatus includes: a measurement unit which includes a tracing stylus to be inserted into a groove of a rim of an eyeglass frame, a moving mechanism for moving the tracing stylus along the groove of the rim, and a detector for detecting movement of the tracing stylus, and obtains three-dimensional shape of the rim based on a detected result by the detector; and a holding unit which includes upper and lower sliders for positioning the frame, left and right clamp pins for clamping the rim and left and right contact portion to be contacted with the rim which is clamped by the clamp pins, and holds the frame fixedly. The left and right clamp pins and the contact portions protrude from each of the upper and lower sliders. Each of the contact portions is formed at the periphery of each of the clamp pins.