Rotary Scale Mounting via Intermediate Positioning Members
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Solution Overview
Problem
Existing methods for mounting rotary scale members on apparatuses often result in misalignment between the scale axis and the axis of rotation, leading to measurement errors due to manufacturing inaccuracies and the need for complex radial adjustments.
Innovation Solution
A method involving the use of intermediate scale-positioning members that are manipulated to achieve a desired radial configuration, allowing the rotary scale member to be fitted onto these members, which automatically locates it at a predetermined radial position, simplifying the manufacturing process and reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If direct mounting of rotary scale member on shaft is used, then manufacturing process is simple, but alignment precision between scale axis and rotation axis deteriorates
Solution Approach 1:
The patent introduces intermediate positioning members (such as positioning rings or positioning members with positioning features) between the rotary scale member and the shaft. These intermediaries provide precise radial positioning and alignment features that ensure accurate co-axisial alignment between the scale axis and rotation axis, while allowing the mounting process to remain relatively simple through standardized positioning mechanisms.
2Manufacturing precision
If complex radial adjustment mechanisms are used, then alignment precision improves, but device complexity increases
Solution Approach 1:
The patent incorporates preliminary positioning features directly into the intermediate positioning members during manufacturing. These pre-configured positioning features (such as precision-machined surfaces, keyed features, or interference-fit elements) automatically establish correct alignment when assembled, eliminating the need for complex post-assembly radial adjustment mechanisms while maintaining high alignment precision.
3Reliability
If force-fitting method is used, then mounting reliability improves, but risk of damage to scale member increases
Solution Approach 1:
The patent employs intermediate positioning members that act as cushioning elements between the force-fitting operation and the delicate rotary scale member. These intermediaries absorb mounting stresses and distribute forces evenly, preventing direct transmission of damaging forces to the scale features while still achieving reliable mechanical coupling and maintaining alignment during the force-fitting process.
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
This approach ensures accurate alignment of the scale axis with the axis of rotation, reducing measurement errors and simplifying the manufacturing process while minimizing potential damage to the scale member.
Implementation Method 1
a radially resiliently compliant member (e.g. a flexure) for radially pushing the body into engagement with one or more rigid stop surfaces
Data Source
AI summary
A method of mounting a rotary scale member on a part, the part being rotatable about an axis of rotation, the rotary scale member including a body on which a series of scale features defining a scale that extends around a scale axis, wherein the method includes: i) mount on the part one or more intermediate scale-positioning members and manipulating the radial configuration thereof until a desired radial configuration with respect to the axis of rotation is achieved; and ii) subsequently fitting the rotary scale member onto the one or more intermediate scale-positioning members, whereby the body of the rotary scale member adopts a default radial location with respect to the one or more intermediate scale-positioning members.