Rotary Table Scale Integration for Compact Infinite Rotation
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Solution Overview
Problem
Existing rotary table devices face challenges in being compact, stable, and efficiently produced, particularly in infinite rotation applications where space constraints and component alignment complicate the installation of ring scales, leading to reduced torque and increased assembly errors.
Innovation Solution
A rotary table device design featuring a base portion, a bearing, and a motor with flat, annularly wound three-phase coreless coils and plate-shaped magnets, where the scale is printed directly on the outer circumference of the table, eliminating the need for a separate scale member and allowing for a more compact, stable, and rationally produced device with improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a ring scale is fitted to the shaft portion of the table in an infinite rotary table device, then the table can rotate infinitely over 360° or more, but the device becomes larger in size and the structure becomes more complex
Solution Approach 1:
The patent merges the scale function directly into the table structure by printing the scale pattern on the outer circumferential surface of the table body. This eliminates the need for a separate ring scale component that would otherwise need to be fitted to the shaft portion, thereby reducing device size while maintaining infinite rotation capability.
Solution Approach 2:
The patent extracts the scale function from the separate ring scale component and integrates it directly into the table structure through printing. This removes the unnecessary ring scale component and its installation requirements, simplifying the overall structure.
2Reliability
If a ring scale is fitted to the shaft portion with screws, then the scale can be securely attached, but the number of components increases and assembly becomes more complex
Solution Approach 1:
The scale is merged with the table structure through direct printing on the outer circumferential surface. This eliminates the need for separate attachment components like screws and ring members, reducing component count while ensuring the scale moves precisely with the table.
Solution Approach 2:
The table structure itself serves as the substrate for the scale pattern, eliminating the need for external attachment mechanisms. The scale is self-integrated into the table, requiring no separate installation steps.
3Volume of moving object
If the scale is printed directly on the outer circumferential surface of the table, then the device becomes more compact and assembly is simplified, but the scale must withstand rotational stresses
Solution Approach 1:
The patent replaces the mechanical attachment method (screws and ring members) with a printing method to apply the scale pattern. This substitution eliminates mechanical fasteners and reduces device size while the printing process creates a durable scale marking that moves with the table.
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 solution results in a compact, stable, and accurately positioned rotary table device capable of infinite rotation with reduced component count, simplified assembly, and enhanced torque, while maintaining high precision and stability by eliminating the need for a ring scale and tape attachment.
Implementation Method 1
The linear motor is composed of armature coils, which are flat, annularly wound three-phase coreless coils, and a field magnet, which is made up of a large number of plate-shaped magnets
Implementation Method 2
An optical sensor placed at the bed reads the scale to thereby detect the position of the table
Data Source
AI summary
A rotary table device which includes a base portion, a bearing, a table rotatably supported with respect to the base portion via the bearing, and a motor operable to rotate the table in a rotational direction of the bearing. The motor includes a coil row fixed to the base portion and having a plurality of flat, annularly wound three-phase coreless coils arranged side by side, and a magnet row arranged opposite to the coil row and fixed to the table, and having a plurality of plate-shaped magnets arranged side by side in a circumferential direction of the table with alternating magnetic poles. The table has an outer circumferential surface on which a scale is printed around the entire circumference. A sensor for reading the scale is mounted on the base portion.