Adaptive Kickback Recognition for Sensor-Based Power Tools
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Solution Overview
Problem
Power tools, such as saws and milling cutters, face safety issues due to sudden 'kickback' events during machining, which can lead to unexpected tool or workpiece movement and user injury, as existing detection systems are not adaptable to varying user expertise or environmental conditions.
Innovation Solution
A power tool with a control device that selectively determines between different recognition functions for kickback detection based on function determination information, allowing for optimized recognition of kickback events by adapting to the current user, tool, and workpiece conditions, using sensor data on force, acceleration, velocity, deflection, deformation, and mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fixed recognition function is used for kickback detection, then the detection system is simple, but it cannot adapt to varying user expertise or operational conditions
Solution Approach 1:
The patent implements multiple recognition functions with different sensitivity levels that can be dynamically selected based on operational conditions. The control device switches between a first recognition function (less sensitive) and a second recognition function (more sensitive) depending on factors such as user expertise, tool type, and workpiece material, making the detection system adaptive rather than static.
Solution Approach 2:
The patent changes the recognition parameters (sensitivity thresholds, detection criteria) based on operational conditions. Different recognition functions have different parameter settings that are selected according to the specific machining situation, allowing the system to optimize detection sensitivity for each scenario without requiring a completely different detection system.
2Reliability
If a sensitive recognition function is used for all users, then weak kickbacks are detected, but experienced users experience unnecessary interruptions
Solution Approach 1:
The patent applies different recognition function characteristics to different user groups and operational scenarios. Inexperienced users receive the benefit of a more sensitive recognition function that detects weak kickbacks, while experienced users receive a less sensitive function that maintains machining continuity. This localized optimization of detection sensitivity resolves the contradiction between reliability and productivity.
3Productivity
If a less sensitive recognition function is used for all users, then machining continuity is maintained, but weak kickbacks are not detected
Solution Approach 1:
The system dynamically adjusts its sensitivity based on the operational context and user characteristics. Rather than using a fixed low-sensitivity setting that would miss weak kickbacks, the system activates higher sensitivity when appropriate (for inexperienced users or specific tool-workpiece combinations) while maintaining lower sensitivity when machining continuity is prioritized, thus resolving the contradiction adaptively.
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
Enhances the usability of power tools by effectively recognizing kickback events, reducing unnecessary interruptions and improving safety by tailoring the detection sensitivity to the user's expertise and operational conditions.
Implementation Method 1
a sensor device (2) for detecting a mechanical quantity (3), the mechanical quantity comprising a force, an acceleration, a velocity, a deflection, a deformation and/or a mechanical stress
Data Source
AI summary
A power tool with a rotatable tool designed as a saw blade or a milling cutter, including a sensor device for detecting a mechanical quantity, the mechanical quantity having a force, an acceleration, a velocity, a deflection, a deformation and/or a mechanical stress, and the mechanical quantity being dependent on a force emanating from the tool, and a control device communicatively coupled to the sensor device, which control device is adapted to recognize a kickback event based on the detected mechanical quantity, where the control device is adapted to selectively determine a first recognition function or a second recognition function different from the first recognition function based on a function determination information, and to perform the recognition of the kickback event based on the detected mechanical quantity using the determined recognition function.