Electric Tool Rotation Lock Based on Pressing Force
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Solution Overview
Problem
Existing electric tools with speed controllable rotary mechanisms start rotating immediately upon force application, which can be inconvenient for users.
Innovation Solution
An electric tool with an output shaft and controller that restricts rotation until a prescribed pressing force is exceeded, using a combination of mechanical and electrical mechanisms to control the rotation of the output shaft based on the pressing force applied from the tip tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric tool is designed to start rotating immediately upon force application for responsive operation, then the productivity is improved, but the ease of operation deteriorates due to unintended start-up and lack of manual control
Solution Approach 1:
The controller changes the operational parameters of the electric tool by introducing a threshold pressing force value. When the detected pressing force is below this threshold, the output shaft rotation is restricted regardless of motor power supply. Only when the pressing force exceeds the threshold does the rotation restriction解除, allowing the tool to operate. This parameter-based control resolves the contradiction by preventing unintended startup (improving ease of operation) while maintaining responsive operation capability (preserving productivity).
2Ease of operation
If the electric tool restricts rotation until a prescribed pressing force is exceeded for safety and manual control, then the ease of operation is improved, but the productivity deteriorates due to delayed start-up
Solution Approach 1:
The system dynamically adjusts its operational state based on real-time detection of pressing force. The controller continuously monitors the force applied to the tip tool and dynamically switches between two states: rotation restriction mode (when force ≤ threshold) and free operation mode (when force > threshold). This dynamic response ensures that the productivity loss is minimal and only occurs during the brief transition period, while providing substantial benefits in ease of operation and safety.
3Speed
If the electric tool allows free rotation for responsive operation, then the speed is improved, but the reliability deteriorates due to unintended activation
Solution Approach 1:
The electric tool incorporates a feedback mechanism where the detector continuously monitors the pressing force applied to the tip tool and provides real-time information to the controller. The controller uses this feedback to make informed decisions about whether to restrict or allow output shaft rotation. This closed-loop feedback system significantly improves reliability by ensuring that rotation only occurs when intentionally activated by sufficient user input, eliminating unintended activation while maintaining high rotational speed when needed.
Data Source
AI summary
An electric tool includes an output shaft and a controller. The output shaft is configured to hold a tip tool and be rotated by motive power provided from an electric motor with the output shaft holding the tip tool. The controller is configured to control rotation of the output shaft in accordance with pressing force in a direction from a tip end of the tip tool toward the output shaft. The electric tool has, as an operation range, a restriction range in which rotation of the output shaft is restricted in a state where the pressing force is less than or equal to a prescribed value.