Magnetic Sensor Fence Angle Detection for Saw Machines
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Solution Overview
Problem
Conventional table saws rely on a simple rule-based angle scale that is prone to being covered by chips during use, leading to inaccurate readings and insufficient precision for fine cutting due to vague graduations over time.
Innovation Solution
A workpiece feeding device with a magnetic sensor system that measures the biasing angle relative to an angle scale, providing accurate cutting angle indication through a display unit, allowing for precise adjustments and improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple rule-based angle scale is used, then the device complexity is reduced, but the measurement precision deteriorates due to vague graduations over time
Solution Approach 1:
The patent replaces the traditional mechanical angle scale reading system with a magnetic sensing system. A magnetic sensor detects the position of a magnetic strip attached to the angle scale, converting mechanical angular position into electrical signals for digital display. This substitution eliminates wear and vagueness issues of mechanical scales while maintaining simple device structure.
Solution Approach 2:
The patent introduces a magnetic strip as an intermediary between the angle scale and the magnetic sensor. The magnetic strip carries magnetic information that the sensor detects, serving as a mediator that transfers angular position information from the mechanical scale to the electronic detection system, thereby improving measurement precision without complicating the overall device.
2Device complexity
If a traditional angle scale is used, then the device complexity is low, but the reliability deteriorates when the scale is covered by cut chips
Solution Approach 1:
The patent replaces the visual mechanical angle scale with an electronic magnetic detection system. The magnetic sensor continuously detects the angular position through magnetic field interaction, providing reliable digital readings that are not obscured by physical obstacles like cut chips, thereby significantly improving reading availability and reliability.
Solution Approach 2:
The magnetic detection system provides self-service by automatically detecting and displaying the cutting angle without requiring user visual inspection or manual reading. The system continuously monitors the angle position and presents the information in a clear digital format that remains accessible regardless of chip accumulation on the scale surface.
3Device complexity
If manual reading of the angle scale is required, then the device complexity is low, but the productivity deteriorates due to time-consuming angle verification
Solution Approach 1:
The patent replaces manual visual reading of the angle scale with an automated magnetic detection and digital display system. The magnetic sensor continuously tracks the angular position and presents it in a clear digital format, eliminating the time required for manual verification and allowing operators to quickly confirm cutting angles, thereby improving sawing operation efficiency.
Solution Approach 2:
The patent implements a feedback system where the magnetic sensor continuously monitors the angle position and provides real-time digital feedback to the operator. This immediate feedback mechanism eliminates the delay associated with manual scale reading and verification, enabling faster decision-making and improved productivity in the sawing process.
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 accurate and precise cutting angle adjustments by detecting changes in magnetic induction, eliminating the need for manual reading and improving precision beyond the limitations of traditional angle scales.
Implementation Method 1
The magnetic sensor is movable with the fence unit to change the angular position thereof relative to the magnetic plate assembly and to measure the biasing angle of the fence unit relative to the angle scale subject to change of magnetic induction between the magnetic sensor and the magnetic strip
Data Source
AI summary
A workpiece feeding device used in a saw machine is disclosed to include a carrier having a base frame movably mounted on the machine base of the saw machine and an angle scale fastened to the base frame, a fence unit having a rip fence pivotally mounted on the base frame of the carrier and biasable relative to the angle scale, a magnetic plate assembly mounted on the base frame of the carrier and carrying a magnetic strip, and a magnetic sensor mounted in the fence unit and movable with the fence unit to measure the biasing angle of the fence unit relative to the angle scale subject to change of magnetic induction between the magnetic sensor and the magnetic strip.