Rotary Tool Auto Stop Mode Selection
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Solution Overview
Problem
Rotary tools, such as impact wrenches, face issues with excessive tightening of bolts due to prolonged trigger pull and inefficient energy use, with existing automatic stop systems being operator-dependent and difficult to adjust, leading to poor usability and potential damage to screws.
Innovation Solution
A rotary tool with four operating modes - High-Power, Low-Power, three seconds auto stop, and one second auto stop - controlled by a mode switching button, utilizing an impact detection part to automatically stop the motor after a predetermined time, allowing easy adjustment of automatic stop conditions based on work requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the trigger is pulled for a long time to tighten a bolt, then the tightening force is sufficient, but the bolt is excessively tightened and elongated
Solution Approach 1:
The rotary tool performs preliminary actions (rotation and tightening) automatically upon trigger pull, then stops automatically after a predetermined time period without requiring the operator to judge when to stop. This preliminary automatic execution and termination prevents excessive tightening while ensuring sufficient tightening force is applied during the operational period.
Solution Approach 2:
The control unit monitors the operation time and provides feedback to automatically stop the motor when the predetermined time period elapses. This time-based feedback mechanism prevents continuous operation that would cause excessive tightening, while allowing sufficient time for proper tightening during the operational period.
2Productivity
If the trigger is pulled unnecessarily for a long time, then the rotary tool remains operational, but electricity is wasted and available operations per charge decrease
Solution Approach 1:
The rotary tool operates in periodic cycles: when the trigger is pulled, the motor rotates for a predetermined time period, then automatically stops. This periodic operation pattern prevents continuous unnecessary operation, reducing electricity consumption per operation while maintaining productivity by ensuring each operation completes its necessary tightening cycle before stopping.
Solution Approach 2:
The control unit is pre-programmed with the predetermined time period for automatic stop. When triggered, it executes the rotation for this predetermined duration and then stops automatically. This preliminary setting of operational parameters prevents excessive energy consumption while ensuring sufficient operational time for each task.
3Manufacturing precision
If an automatic stop system is implemented with preset load current or voltage values, then the screw tightening torque is optimized, but variation occurs depending on each operator and the system is difficult to adjust
Solution Approach 1:
The invention changes the control parameter from load current or voltage (which vary by operator and situation) to time duration (which is consistent and easily adjustable). By controlling the motor to rotate for a predetermined time period, the system achieves consistent tightening results across different operators while allowing easy adjustment of the time parameter to match different screw types and tightening requirements.
Solution Approach 2:
The system allows dynamic adjustment of the predetermined time period based on work requirements. The control unit can be reprogrammed with different time values to accommodate different screw sizes, materials, and tightening needs, making the system adaptable to various situations while maintaining operational simplicity.
Data Source
AI summary
A rotary tool is provided with a mode selecting part that selects one operating mode from a predetermined plurality of operating modes when a mode switching button is pressed. The plurality of operating modes include: a first auto stop mode where a motor rotates only for a first time period after an impacting operation is detected; and a second auto stop mode where the motor rotates only for a second time period which is shorter than the first time period after the impacting operation is detected.