Incremental Encoder Dog with Variable Slits for Rapid Position Detection
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Solution Overview
Problem
Existing detection systems for moving members using incremental encoders require time-consuming origin return operations to prevent cumulative errors, making it difficult to quickly detect the state of moving members, especially when they are far from the origin.
Innovation Solution
A detection device with a reference member, a moving member, an incremental encoder, a dog with varying slit separation distances and widths, and a sensor to quickly determine the state of the moving member by acquiring count start and end positions and detecting count value changes, allowing for rapid detection of the moving member's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an origin return operation is performed using an incremental encoder to prevent cumulative errors, then detection reliability is improved, but detection time increases significantly
Solution Approach 1:
The detection scale is divided into multiple segments with different slit patterns. Instead of requiring a full origin return, the sensor detects which segment is currently active by sensing the slit patterns, thereby determining the moving member's position within a limited travel range. This segmentation allows position detection without time-consuming origin return operations.
Solution Approach 2:
The dog component is pre-configured with multiple slits at predetermined positions and intervals before the moving member starts moving. These slits are arranged in specific patterns (different widths and/or spacing) to encode position information. When the sensor detects the slit pattern, it can immediately determine the current position without needing to perform preliminary origin return operations.
2Length of moving object
If the moving member is positioned far from the origin, then the detection system can cover a larger range, but the origin return operation takes longer
Solution Approach 1:
The detection scale is divided into multiple segments with different slit patterns. Instead of requiring a full origin return, the sensor detects which segment is currently active by sensing the slit patterns, thereby determining the moving member's position within a limited travel range. This segmentation allows position detection without time-consuming origin return operations.
Solution Approach 2:
The system uses only a portion of the detection scale at any given time (the segment containing the moving member). The multiple slits are arranged to cover a limited range, and the sensor detects position within this range by identifying the active segment's slit pattern, rather than requiring the moving member to travel the entire scale length from origin.
3Measurement precision
If multiple slits with varying separation distances and widths are used in the dog, then position detection accuracy is improved, but device complexity increases
Solution Approach 1:
Different segments of the detection scale have different local qualities in terms of slit patterns. Each segment contains slits with specific widths and spacing arrangements that are unique to that segment. The sensor detects the local slit pattern to identify which segment is active, thereby determining position. This local differentiation provides position information without requiring complex additional 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
Enables rapid detection of the moving member's state by minimizing the movement required to determine the origin position, thus reducing the time needed for detection and improving positional accuracy.
Implementation Method 1
a sensor which is disposed on the other of the reference member and the moving member and detects presence or absence of the slits
Data Source
AI summary
A detection device which detects a state of a moving member such as an origin position of the moving member in a short time, is provided with a dog which includes the multiple slits, in which at least one of a separation distance between adjacent slits and a width of the slits themselves is formed in multiple kinds, a sensor which detects the presence or absence of the slits, a count position acquisition section which acquires a count start position and a count end position corresponding to the separation distance between the adjacent slits or the width of the slits themselves based on detection results of the sensor, and a state detection section which acquires a count value increase or decrease number from the count start position to the count end position and detects a state of the moving member based on the acquired count value increase or decrease number.