Flat-Spring Coupling Element for Gantry Positioning Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gantry-type positioning devices face challenges in achieving precise positioning due to tilting issues caused by asynchronous operation of parallel linear guides, which affects the stiffness and accuracy of the functional element's movement.
Innovation Solution
A coupling element with a central part and a surrounding part connected by flat springs, designed to provide high stiffness against undesirable tilting while allowing limited tilting in a desirable direction, is used to couple the first and second linear guides in a gantry-type positioning device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the coupling between linear guides is made rigid to prevent tilting, then positioning precision is improved, but the device cannot accommodate asynchronous operation of parallel linear guides
Solution Approach 1:
The coupling element incorporates flat springs that provide dynamic flexibility, allowing the system to adapt to asynchronous operation while maintaining positioning precision. The springs enable controlled movement and tilting accommodation without compromising the rigidity needed for precise positioning.
Solution Approach 2:
The coupling element changes the stiffness parameter spatially, with different regions having different compliance characteristics. This allows the coupling to be rigid in directions where precision is critical while being flexible in directions where asynchronous operation needs to be accommodated.
2Measurement precision
If the coupling element is made stiff to prevent tilting about the second linear direction, then positioning accuracy is improved, but the device becomes unable to permit controlled tilting about the vertical Z-axis
Solution Approach 1:
The coupling element has different structural characteristics in different regions: it is stiff in directions where positioning accuracy is critical (preventing tilting about the second linear direction) while being flexible in directions where controlled tilting is desired (about the vertical Z-axis). This local differentiation of mechanical properties resolves the contradiction.
Solution Approach 2:
The coupling element employs asymmetric spring arrangements and structural configurations that provide different stiffness characteristics for different axes of rotation. This asymmetry enables the device to prevent unwanted tilting while permitting controlled tilting in specific directions.
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
The coupling element enhances the stiffness of the positioning device, particularly against tilting about the second linear direction, while permitting controlled tilting about a perpendicular direction, thereby improving the precision and accuracy of the functional element's positioning.
Implementation Method 1
A plurality of connecting flat springs are disposed to create the distance and connect together the central part and the central portion of the surrounding part
Data Source
AI summary
A coupling element for a positioning device, which includes a first and second linear guides for guiding first and second carriages respectively along first and second linear directions, is configured to create a coupling between the first carriage and the second linear guide. The coupling element includes a central part and a surrounding part spaced at a distance therefrom. The surrounding part has a central portion surrounding the central part, and has two end portions adjoining the central portion in the first linear direction. Connecting flat springs are disposed to create the distance and connect together the central part and the central portion of the surrounding part. The connecting flat springs lie in planes which intersect at a center of the central part. A vertical flat spring is disposed parallel to the first linear direction at each of the two end portions of the surrounding part.