Motor-Driven Screwdriver Counting Mechanism
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Solution Overview
Problem
Conventional motor-driven screwdrivers inaccurately return count values when reversing direction, leading to mismatches between recorded and actual tightened screws or nuts, due to lack of linkage between reverse driving and count value adjustment.
Innovation Solution
A threaded member tightening tool with a computing unit that switches between counting and count return modes, returning the count value to a previous state only when the tool is driven in reverse, ensuring accurate counting by linking count value adjustments with reverse driving operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the count value is automatically returned when the screwdriver bit is driven reversely, then the counting function is improved, but the count value may be mistakenly returned when the screwdriver is driven reversely to remove a screw not properly tightened and hence not counted
Solution Approach 1:
The control unit monitors the tightening completion status of screws and uses this feedback information to determine whether to return the count value. When a screw is removed reversely, the system checks if it was previously counted before decrementing the count, preventing erroneous count adjustments for screws that were never tightened or counted in the first place
Solution Approach 2:
The screwdriver automatically determines whether count value return is necessary by checking its own tightening completion records, eliminating the need for manual intervention while maintaining accuracy through self-monitoring of the tightening status
2Device complexity
If the count value is returned by the worker simply pressing the button, then the device complexity is reduced, but the count value may be mistakenly returned although a screw removing operation has not actually been performed
Solution Approach 1:
The control unit requires feedback from the reverse driving operation itself to trigger count value return. The system detects the reverse driving event and cross-references it with the tightening completion status, ensuring that count adjustment occurs only when both reverse driving and previous tightening are confirmed, thereby preventing erroneous count returns
3Ease of operation
If the count value is automatically returned when the screwdriver is driven reversely to remove a screw, then the ease of operation is improved, but the count value fails to match the number of actually tightened screws when the screw was not properly tightened
Solution Approach 1:
The control unit uses feedback from the tightening completion detection system to determine whether count value return should occur. By cross-referencing the reverse driving event with the stored tightening status, the system automatically adjusts the count only when appropriate, maintaining both ease of operation and count accuracy without requiring manual intervention
Data Source
AI summary
Provided is a threaded member tightening tool capable of returning a count value in linkage with reverse driving by the threaded member tightening tool and only when a threaded member to be removed by the reverse driving has been counted as a tightened threaded member. A computing unit of a motor-driven screwdriver is switchable between a counting mode in which the computing unit counts the number of tightened threaded members and holds the counted number as a count value and a count return mode for returning the count value to a one-preceding count value. The computing unit returns the count value to a one-preceding count value based on the fact that the engaging element fitting unit has been driven in the reverse direction when the computing unit has been switched to the count return mode.