Rotary Contour Reader with Offset Carrier Arm for Eyeglass Rims
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Solution Overview
Problem
Existing contour reading devices for eyeglass frame rims are limited in reliability and cost-effectiveness, particularly in accurately measuring the shape of bezels for fitting ophthalmic lenses, as they often require complex mechanisms and are prone to dust and dirt interference.
Innovation Solution
A contour reading device featuring a turntable with a reading subassembly that includes a feeler mobile in a circular arc path, with dual rotations and translations, and an offset carrier arm system that reduces cost and improves reliability by minimizing dust interference, using a semicircular slot and angular drive mechanisms for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex mechanism is used to ensure accurate contour measurement, then measurement precision is improved, but device complexity increases and cost rises
Solution Approach 1:
The reading subassembly is segmented into distinct functional components: the turntable for angular positioning, the carrier arm for radial movement, and the feeler for contour detection. This segmentation allows each component to be optimized independently while maintaining overall measurement accuracy, reducing the complexity of any single component.
Solution Approach 2:
The invention transitions from linear measurement approaches to polar coordinate measurement by introducing angular rotation of the turntable. This dimensional change allows the feeler to trace circular arcs centered on the carrier axis, enabling accurate contour measurement through rotational movement combined with radial translation, thereby simplifying the overall measurement mechanism.
2Measurement precision
If the feeler is positioned in line with the rotation axis for optimal measurement, then measurement precision is improved, but susceptibility to dust and dirt interference increases
Solution Approach 1:
The carrier arm is designed with an offset position relative to the turntable rotation axis, creating an asymmetric configuration. This offset positioning allows the feeler to trace circular arcs that are displaced from the central rotation axis, maintaining measurement precision while reducing the feeler's exposure to dust and dirt that accumulate near the rotation center.
Solution Approach 2:
The carrier arm acts as an intermediary between the turntable rotation and the feeler measurement point. By positioning the feeler on the carrier arm at an offset distance, the system mediates between the rotational movement and the measurement function, allowing the feeler to maintain optimal measurement geometry while being physically separated from the dust-prone rotation axis area.
3Object-affected harmful factors
If a semicircular slot is introduced to protect the reading subassembly, then protection against dust and dirt is improved, but device complexity increases
Solution Approach 1:
A semicircular slot is introduced into the turntable structure to accommodate the carrier arm's rotational movement. The curved geometry of the slot naturally guides the carrier arm through its arc-shaped path while providing physical protection against dust and dirt. This curved design is more efficient than straight-line protection structures, as it conforms to the natural motion path of the mechanism.
Solution Approach 2:
The protective function and the motion guidance function are merged into the single semicircular slot structure. The slot simultaneously protects the reading subassembly from contaminants and guides the carrier arm through its required arc-shaped trajectory, eliminating the need for separate protective enclosures and reducing overall structural complexity.
4Reliability
If dual rotation movements are implemented for reliable reading, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The carrier arm serves multiple functions: it acts as a structural support for the feeler, provides the radial translation movement, and guides the angular positioning. This multi-functionality reduces the need for separate components for each movement type, allowing dual rotation movements to be implemented reliably without proportionally increasing device complexity.
Solution Approach 2:
The reading subassembly employs dynamic movements where the carrier arm rotates about the carrier axis while simultaneously translating along the carrier axis. This dynamic combination of rotational and translational movements, controlled through the semicircular slot geometry, provides reliable contour tracking adaptability while maintaining a relatively simple mechanical structure compared to rigid multi-component systems.
Data Source
AI summary
Contour reading device, in particular for eyeglass frame rims, including a carrier axis (A) projecting transversely to the surface of a turntable (6), a carrier arm (18) which is mounted at one end to turn about the carrier axis (A) and at the other end of which a feeler (8) is mounted, whereby the feeler (8) is mobile relative to the turntable (6) along a circular arc path centered on the carrier axis (A).