Motion Guide Position Detection Using Track Through Holes
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Solution Overview
Problem
Existing position detection apparatuses for motion guide systems require space to affix a scale to the track member, which is a challenge for small motion guide apparatuses.
Innovation Solution
A position detection apparatus that utilizes through holes in the track member as a scale, with a magnet generating a magnetic field and magnetic sensors to detect changes in the field, eliminating the need for additional space and using the track member itself as the scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic or optical scale is affixed to the track member, then position detection is enabled, but space is required to affix the scale
Solution Approach 1:
The patent merges the scale function with the track member itself by utilizing the through holes that are already present in the track member for fastening purposes. The through holes serve dual functions: mechanical fastening and position detection reference points, eliminating the need for a separate affixed scale.
Solution Approach 2:
The through holes in the track member are given multiple functions: they serve both as mechanical fastening points and as reference marks for position detection. This multi-functionality eliminates the need for additional components and space that would be required for a dedicated scale.
2Measurement precision
If a separate scale is affixed to the track member, then position detection is achieved, but device complexity increases
Solution Approach 1:
The patent combines the position detection function with the existing track member structure by using its through holes as reference marks. This merging approach eliminates the need for separate scale components, reducing overall device complexity while maintaining position detection capability.
Solution Approach 2:
The track member serves its own position detection needs by utilizing its own through holes as reference marks. The existing structural features of the track member are leveraged for dual purposes, eliminating the need for additional dedicated components.
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 allows for a compact and inexpensive position detection system, suitable for small motion guide apparatuses, where the track member's through holes serve as the scale, enabling precise position detection without additional space requirements.
Implementation Method 1
a magnet generating a magnetic field toward the track member
Implementation Method 2
a magnetic sensor placed within the magnetic field, the magnetic sensor being configured to detect a change in the magnetic field of the magnet with the travel of the magnet relative to the track member
Data Source
AI summary
A position detection apparatus is provided which eliminates the necessity of space to affix a scale to a track member. A track member of a motion guide apparatus is provided with a through hole into which a fastening member to fasten the track member to a base can be inserted. A carriage that is movably assembled to the track member via a rolling element is provided with magnets generating a magnetic field toward the track member. Magnetic sensors that detect a change in the magnetic fields of the magnets with the travel of the magnets relative to the track member are placed within the magnetic fields of the magnets.