Eccentric Rotary Positioning System for Precision Tool Control
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Solution Overview
Problem
Existing industrial systems for moving and positioning objects, such as grinding tools, rely on large and expensive orthogonally-oriented precision slide mechanisms for two or three-axis motion, which are not cost-effective or efficient for reliable and repeatable positioning.
Innovation Solution
A system utilizing eccentric rotary motions with coupled rotatable portions and a controller to achieve two or more relative rotary motions, allowing for precise positioning of objects in two or three dimensions, potentially replacing traditional slide mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If orthogonally-oriented precision slide mechanisms are used for two or three-axis motion, then positioning precision and reliability are improved, but device cost and complexity increase
Solution Approach 1:
The patent inverts the conventional approach by using rotary motion instead of linear slide mechanisms. The grinding wheel is rotated into and out of the grinding location (Z-direction) and toward and away from the bearing race (X-direction) through eccentric rotary motions, eliminating the need for complex orthogonal slide mechanisms while maintaining positioning precision and reliability
Solution Approach 2:
The patent changes the motion parameter from linear translation to rotary motion. By controlling the rotation of the grinding wheel about different axes, the system achieves the same positioning functions as slide mechanisms but with simpler hardware, reducing device complexity while preserving reliability
2Manufacturing precision
If orthogonally-oriented precision slide mechanisms are used for two or three-axis motion, then positioning precision is improved, but manufacturing and repair cost increase
Solution Approach 1:
The patent replaces expensive linear slide mechanisms with rotary motion systems. The grinding wheel is rotated into and out of the grinding location and toward and away from the bearing race through controlled rotation, achieving the same positioning precision with simpler, less expensive components that are easier to manufacture and repair
Solution Approach 2:
The patent employs simpler rotary mechanisms that are less expensive to manufacture compared to precision slide mechanisms. While the service life may be comparable, the reduced manufacturing cost and ease of repair make this a more economical solution for achieving the required positioning precision
3Device complexity
If eccentric rotary motions are used instead of slide mechanisms, then device cost and complexity are reduced, but achieving precise two or three-axis motion becomes more challenging
Solution Approach 1:
The patent employs feedback control to manage the complexity of translating rotary motion into precise linear positioning. By monitoring the rotational position and adjusting control signals accordingly, the system achieves accurate control of the grinding wheel's position in X and Z directions, compensating for the non-linear relationship between rotary input and linear output
Solution Approach 2:
The patent uses dynamic control of rotational speed and position to achieve precise positioning. The system adjusts the rotation parameters in real-time based on the desired tool path and positioning requirements, enabling accurate motion control despite the inherent complexity of eccentric rotary mechanisms
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 solution enables reliable, repeatable, and cost-effective positioning of objects in two or three dimensions, reducing the need for expensive slide mechanisms and allowing for precise control of object movement and orientation.
Implementation Method 1
rotation of the first rotatable portion causes eccentric rotation of the second rotatable portion about the first axis
Data Source
AI summary
A system for moving and positioning an object such as a tool. The system has a first assembly that has a first rotatable portion that is rotatable about a first axis, and a second assembly that has a second rotatable portion that is rotatable about a second axis that is not coincident with the first axis. The system may include a third assembly that has a third rotatable portion that is rotatable about a third axis that is not coincident with the second axis. The assemblies are coupled such that rotation of the first rotatable portion causes eccentric rotation of the second and third rotatable portions about the first axis. The system also includes a controller for causing one, two or all three of the rotatable portions to rotate, so as to establish a desired position of an object that is coupled to the system.