Power Tool Automatic Reverse Control for Tapping
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Solution Overview
Problem
The repetitive operation of switching the rotation direction of a tap bit in power tools to remove chips during tapping is burdensome for users, as it requires manual switching of the forward-reverse switch, leading to user fatigue and potential wear on the switch components.
Innovation Solution
A power tool with a controller that includes a microcontroller and mode shifting switch, allowing the tool to automatically switch between forward and reverse rotation directions when the trigger is deactivated, reducing the need for manual operation of the forward-reverse switch and minimizing wear on its components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the forward-reverse switch is manually operated to reverse rotation direction for chip removal, then chip removal is achieved, but user burden increases and switch components wear
Solution Approach 1:
The power tool automatically reverses rotation direction without user intervention. The control unit detects when tapping operation is performed and autonomously switches rotation direction to remove chips, eliminating the need for manual forward-reverse switch operation and thereby extending switch component life while maintaining ease of chip removal
Solution Approach 2:
The manual mechanical operation of the forward-reverse switch is replaced by an automated electronic control system. The control unit uses detection signals from the tapping operation to trigger automatic rotation direction reversal, substituting the mechanical switch operation with an electronic control mechanism that reduces wear on physical components
2Productivity
If the forward-reverse switch is repeatedly operated for chip removal, then chips are removed effectively, but operation time increases due to repetitive switching
Solution Approach 1:
The power tool maintains continuous tapping operation without interruption for chip removal. The automated rotation direction reversal occurs seamlessly during operation, eliminating the need to stop and manually switch directions, thereby maintaining productivity while reducing the time lost to repetitive switching operations
Data Source
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AI summary
A power tool (10) includes a motor (17), a drive unit (18) driven by the motor (17), and a trigger switch (20) and a forward-reverse switch (21) each operable by a user. The trigger switch (20) is switchable between an activation state and a deactivation state. The forward-reverse switch (21) switches a motor rotation between forward and reverse. The power tool (10) also includes a control unit (25) that drives the motor (17) based on operation of the trigger switch (20) and allows switching of an operation mode of the power tool (10) between first and second modes. In the first mode, the motor rotation is switched to that selected by the forward-reverse switch (21). In the second mode, when the activation state is switched to the deactivation state, the motor rotation is switched so that the motor (17) is driven in a direction opposite to the present rotation direction when the trigger switch (20) is activated next.