Form Measuring Instrument Abnormality Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional contact-type form measuring instruments face sensitivity reduction issues in their contact sensors, leading to improper contact control and potential damage due to undetected abnormalities in the contact tip or sensor.
Innovation Solution
A form measuring instrument equipped with a contact tip, movement mechanism, movement controlling unit, contact sensor, and abnormality determining unit that monitors and compares detection signal changes to detect sensitivity abnormalities, preventing excessive contact and potential damage by adjusting thresholds based on movement speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact sensor operates without abnormality detection, then the measuring instrument can function continuously, but the sensitivity reduction goes undetected leading to contact tip and sensor damage
Solution Approach 1:
The abnormality determining unit performs preliminary detection of sensitivity abnormalities by monitoring detection signal changes during movement mechanism operation. This preliminary action identifies sensor degradation before it causes contact tip or sensor damage, preventing harmful effects while maintaining continuous operation capability
Solution Approach 2:
The system establishes a feedback loop where the abnormality determining unit continuously monitors the detection signal from the contact sensor, compares it against expected ranges, and identifies sensitivity reductions. This feedback mechanism enables real-time abnormality detection without requiring additional hardware beyond the existing sensor system
2Measurement precision
If the contact tip is pressed strongly against the object to be measured, then measurement precision is improved, but the contact sensor may be damaged due to excessive force
Solution Approach 1:
The abnormality determining unit monitors detection signal changes to provide feedback on contact sensor health. By detecting sensitivity reductions before they lead to excessive force application, the system prevents sensor damage while maintaining measurement precision through appropriate contact force control
Solution Approach 2:
The system performs preliminary detection of sensitivity abnormalities that could lead to excessive contact force. By identifying sensor degradation early, the system can adjust measurement parameters or alert operators before damage occurs, balancing measurement precision requirements with sensor protection
3Reliability
If the sensitivity of the contact sensor reduces due to abnormalities, then the contact state control becomes improper, but detecting this abnormality requires additional monitoring complexity
Solution Approach 1:
The abnormality determining unit creates a feedback mechanism that monitors detection signal changes during normal operation. By analyzing the magnitude and pattern of signal changes, the system detects sensitivity reductions and improper contact state control without requiring separate monitoring hardware, maintaining reliability while limiting complexity growth
Solution Approach 2:
The contact sensor system performs self-diagnosis by having the abnormality determining unit analyze its own detection signals for abnormal changes. This self-service approach enables the system to detect sensitivity reductions and control state abnormalities using existing sensor outputs, avoiding additional monitoring complexity while improving reliability
Data Source
AI summary
A form measuring instrument includes: a contact tip configured to contact with a workpiece; a movement mechanism configured to cause relative movement of the contact tip with respect to the workpiece; a movement controlling unit configured to control the movement mechanism; a contact sensor configured to detect a contact amount of the contact tip with the workpiece and output a detection signal corresponding to the contact amount; and an abnormality determining unit configured to determine an abnormality of sensitivity of the contact sensor based on a change in the detection signal outputted from the contact sensor during an operation of the movement mechanism in which the contact tip is pressed against the workpiece.