Position Measuring System Assembly Aid for Alignment Precision
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Solution Overview
Problem
Existing position measuring systems face challenges in achieving precise measurements due to cumbersome two-stage procedures for aligning the scanning head and measuring graduation, leading to difficulties in achieving high measurement accuracy.
Innovation Solution
A modular position measuring system with an assembly aid that allows for adjustable attachment of the measuring graduation to the scanning head, enabling optimal alignment through adjustable devices in multiple degrees of freedom, allowing for precise and accurate position measurement without disturbing the measuring operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-stage procedure (adjustment then fixation) is used to align the scanning head and measuring graduation, then the assembly position can be established, but the process becomes cumbersome and measurement precision deteriorates
Solution Approach 1:
The assembly aid is divided into a first section that attaches to the carrier and a second section that attaches to the scanning head, with adjustment devices positioned between these sections. This segmentation allows independent adjustment of each section while maintaining overall alignment precision.
Solution Approach 2:
The adjustment devices enable dynamic adjustment of the carrier's position relative to the scanning head in multiple degrees of freedom before final fixation. This dynamic adjustment capability allows optimal alignment to be achieved and then locked in place, ensuring both ease of assembly and measurement precision.
2Stability of the object's composition
If the carrier is firmly fixed to the scanning head, then assembly stability is improved, but adjustment capability is lost
Solution Approach 1:
The system transitions from a dynamic state during assembly (where adjustment devices allow movement in multiple degrees of freedom) to a static state during measurement (where the carrier is firmly fixed to the scanning head). This dynamic-to-static transition resolves the contradiction by providing both adjustment capability and assembly stability at appropriate times.
Solution Approach 2:
All necessary adjustments are performed preliminarily during the assembly phase using the adjustment devices. Once the optimal position is achieved, the carrier is firmly fixed to the scanning head, locking in the adjusted position. This preliminary action ensures that no further adjustment is needed during measurement, maintaining both stability and adaptability.
3Adaptability or versatility
If adjustment devices are permanently attached, then adjustment flexibility is maintained, but device complexity and interference during measurement increase
Solution Approach 1:
The adjustment devices are extracted from the permanent structure and implemented as temporary components of the assembly aid. After the carrier is adjusted and fixed to the scanning head, the assembly aid (including the adjustment devices) is detached and removed. This extraction eliminates unnecessary complexity and interference during measurement while maintaining adjustment flexibility during the assembly phase.
4Productivity
If the carrier and scanning head are aligned in a single step, then the process is simplified, but assignment precision deteriorates
Solution Approach 1:
The alignment process is segmented into two distinct phases: an adjustment phase where the carrier's position is optimized relative to the scanning head using adjustment devices, and a fixation phase where the carrier is firmly attached. This segmentation allows precise alignment to be achieved systematically without significantly increasing assembly time, resolving the contradiction between assembly speed and assignment precision.
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
Enables precise and accurate position measurement by optimizing the alignment of the measuring graduation with the scanning head, ensuring high measurement accuracy and simplifying the assembly process, while allowing for easy detachment of the assembly aid to prevent interference during the measuring operation.
Implementation Method 1
the scanning head containing a light source and detectors in a known manner. The light from the light source is position-dependently modulated by the measuring graduation and reaches the detectors by reflection, which generate a plurality of phase-shifted, position-dependent electrical scanning signals.
Data Source
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AI summary
The present invention relates to a position measuring system comprising a carrier (11) of a measuring scale (1) and a scanning head (2) for scanning this measuring scale (1). The position measuring system includes a mounting aid (3) with which the scanning head (2) can be adjusted relative to the carrier (11) of the measuring scale (1) and the carrier (11) of the measuring scale and the scanning head (2) can be mounted on machine parts in an adjusted mounting position using the mounting aid (3).