Separate Linear Encoder Vibration Isolation
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Solution Overview
Problem
Conventional unit-type linear encoders attached to press machines experience erroneous counting due to vibration energy causing the detector to float, leading to inaccurate measurements when large-amplitude vibrations occur in directions other than the measuring direction.
Innovation Solution
A displacement measuring device with a separate-type linear encoder configuration, where the scale is fixed to one relative displacement member and the detector is coupled to a slider of a linear motion guide via a link that can tilt and rotate, absorbing vibrations through a rigid structure without contact between the scale and detector, and utilizing an absolute encoder for precise position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a unit-type linear encoder with contact between scale and detector is used, then the structure is simple, but the detector floats up during vibration causing erroneous counting
Solution Approach 1:
The encoder is divided into separate components: the scale is fixed to one member while the detector is mounted on a slider that can move independently along a guide. This segmentation allows the detector to be isolated from vibration-induced floating while maintaining structural simplicity.
Solution Approach 2:
A linear motion guide acts as an intermediary between the scale and detector, providing a constrained path for detector movement. This intermediary structure prevents the detector from floating freely during vibration while allowing necessary positional adjustments.
2Stability of the object's composition
If a rigid connection between scale and detector is used, then measurement stability is improved, but vibration causes erroneous counting in vibration machines
Solution Approach 1:
The detector mounting is made dynamic rather than rigidly fixed. The detector is mounted on a slider that can move along the linear motion guide, allowing the system to dynamically adapt to vibration conditions while maintaining measurement stability through the guide's constraints.
3Device complexity
If the detector is directly coupled to the moving member, then the structure is simple, but vibration energy causes the detector to float and produce measurement errors
Solution Approach 1:
The linear motion guide serves as an intermediary structure between the detector and the moving member. It provides a controlled path for detector movement while isolating the detector from direct vibration transmission, thereby maintaining both structural simplicity and measurement precision.
Data Source
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AI summary
A displacement measuring device for a vibration machine (40) vibrating in a direction other than a measuring direction includes: a scale (50) and a linear motion guide (rail 52) which are fixed to one relative displacement member (48), and a detector (56) which is fixed to a slider (54) of the linear motion guide, and a link (60) which freely rotatably couples the slider (54) and the other relative displacement member (46) . This prevents occurrence of erroneous counting due to vibration in a vibration machine.