Power Tool Object Detection for Flesh-Safe Motor Control
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Solution Overview
Problem
Power tools lack the ability to safely and automatically adjust their operation based on the presence and type of materials in their operating path, potentially leading to accidents or damage when encountering objects like flesh or specific types of materials.
Innovation Solution
Incorporating an object detection sensor system that generates output signals indicative of materials in the operating path, allowing a controller to determine the presence and type of objects and adjust the power tool's operation accordingly, such as interrupting power to the motor when flesh is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power tools operate continuously without object detection, then productivity is maintained, but safety risks increase when flesh or certain materials are encountered
Solution Approach 1:
The object detection sensor performs preliminary detection of objects in the operating path before the power tool's output component reaches them. The controller receives sensor signals and determines object presence/type in advance, allowing the system to prepare appropriate responses (such as interrupting power) before contact occurs, thus preventing accidents while maintaining productivity.
2Reliability
If object detection sensors and controllers are added to power tools, then safety and adaptability improve, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it controls the motor operation, receives and processes signals from the object detection sensor, determines object presence and type, and decides when to interrupt power. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while achieving improved safety and adaptability.
3Reliability
If the power tool interrupts operation frequently due to object detection, then safety is enhanced, but productivity decreases
Solution Approach 1:
The object detection sensor provides continuous feedback to the controller about objects in the operating path. The controller uses this feedback to make real-time decisions about motor operation, interrupting power only when objects of certain types are detected and resuming when the path is clear. This feedback mechanism ensures safety while minimizing unnecessary interruptions to productivity.
Data Source
AI summary
A power tool and methods are provided for detecting objects (e.g., flesh or other materials) in the operating path of a power tool's output component (e.g., saw blade or drill bit). An object detection sensor in the power tool generates an output signal indicative of a type of material detected in the operating path of the power tool. A power tool controller receives the object detection sensor output and determines when a material in the operating path of the power tool changes. The controller changes operation of a motor of the power tool (e.g., increasing or decreasing speed or stopping the motor) in response to the detected material change. The object detection sensor may include, for example, an RF sensor, a capacitive sensor, a camera, a conductivity probe, or an ultrasound probe.