Roughness Tester Automatic Measurement via Height Detector
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Solution Overview
Problem
Existing roughness testers are inefficient and prone to measurement errors due to the difficulty in maintaining the stylus's vertical contact with the workpiece surface, requiring operators to manually start measurements and verify stylus alignment, which hampers efficiency and accuracy.
Innovation Solution
A roughness tester design incorporating a drive unit, stylus unit, stylus displacement detecting unit, coupling means, biasing means, and a height detector that automatically initiates measurement when the stylus is vertically aligned with the workpiece surface, allowing for hands-free operation and improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the stylus unit is manually positioned and measurement is manually started, then the operator can control the measurement process, but the measurement efficiency is reduced and the operator's hand is occupied
Solution Approach 1:
The roughness tester automatically detects when the stylus is properly positioned on the workpiece surface and autonomously initiates the measurement process. The drive unit self-starts when the height detector confirms proper stylus contact, eliminating the need for manual start button operation and allowing hands-free measurement initiation.
2Measurement precision
If the stylus is made small for precise measurement, then the measurement accuracy is improved, but the stylus becomes difficult to visually recognize and align vertically with the workpiece surface
Solution Approach 1:
A height detector serves as an intermediary device between the operator and the stylus positioning. Instead of directly observing the small stylus, the operator positions the main body support foot and detector support foot on the workpiece surface, and the height detector automatically verifies when the stylus is at the correct height and vertical alignment, making the alignment process objective and easy to detect.
3Measurement precision
If the operator must visually verify stylus vertical contact with the workpiece surface, then measurement accuracy can be maintained, but the process becomes time-consuming and skill-dependent
Solution Approach 1:
The manual visual verification process is replaced with an automated height detection system. The height detector uses a detection pin that mechanically contacts the workpiece surface at a reference height, and when this height matches the stylus height, the system automatically confirms proper alignment and initiates measurement, replacing subjective visual inspection with objective mechanical detection.
4Adaptability or versatility
If the roughness tester is designed to be compact and portable, then the device can be carried to measurement sites, but the automatic start function requires additional components increasing device complexity
Solution Approach 1:
The height detection system serves multiple functions: it verifies proper stylus positioning, confirms vertical alignment of the stylus with the workpiece surface, and triggers the automatic start of measurement. By combining these functions into a single detection mechanism, the patent adds automatic start capability without proportionally increasing device complexity.
Data Source
AI summary
There is provided a roughness tester that improves measurement efficiency and roughness measurement accuracy.A roughness tester includes a stylus unit including a stylus that is provided in such a manner as to protrude from and retract into a through hole of a skid and performs scanning movement along a surface of a workpiece, and a stylus displacement detecting unit that detects displacement of the stylus, and a drive unit that moves the stylus unit forward and backward in a drive-axis direction. The roughness tester further includes a height detector that is provided in such a manner as to face a front end face of the main-body housing part, interposing the skid between the height detector and the front end face and that detects a height of an object in a direction parallel with a measurement axis. When the height detector detects the object at the same height of the height of the main-body support foot in the measurement axis direction, the drive unit automatically starts driving in order for the stylus unit to perform scanning measurement of the surface of the workpiece.