Alignment Device Inclination Adjustment via Clearance Formula
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Solution Overview
Problem
It is challenging to select an appropriate nut and screw shaft with the correct clearance amount for adjusting the inclination of a common base with respect to a slide base, as the required clearance varies with the target inclination.
Innovation Solution
The alignment device includes a base table and linear motion devices with nuts and screw shafts, where the clearance amount is determined by the formula Tr > (M+L)(1−cos θ)+N sin θ, ensuring an appropriate clearance for the target inclination, and an urging member is used to prevent rattling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a nut and screw shaft are selected for inclination adjustment, then the alignment table can be inclined with respect to the base table, but it is difficult to select an appropriate nut and screw shaft because the required clearance amount changes in accordance with the target inclination
Solution Approach 1:
The patent applies parameter changes by establishing a mathematical relationship between the clearance amount Tr and the inclination angle θ through the formula Tr>(M+L)(1−cos θ)+N sin θ. This allows the clearance parameter to be dynamically determined based on the target inclination angle, enabling appropriate component selection for any desired inclination while maintaining ease of manufacture.
2Adaptability or versatility
If the clearance amount between nut and screw shaft is increased to accommodate inclination adjustment, then the alignment table can achieve the target inclination, but rattling occurs during operation
Solution Approach 1:
The patent applies dynamics by introducing an urging member that dynamically adjusts the contact state between the nut and screw shaft. The urging member applies a predetermined force to maintain appropriate contact pressure, eliminating rattling during operation while preserving the clearance necessary for inclination adjustment. This dynamic approach allows the system to adapt between requiring clearance for inclination and requiring contact for stability.
Data Source
AI summary
An alignment device includes a base table, a plurality of electric actuators attached to the base table, an alignment table supported by the plurality of electric actuators. Each of the plurality of electric actuators includes a linear motion device that drives the alignment table in a direction approaching or separating from the base table.