Electric Motor-Driven Screwdriver Torque Notification Circuit
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Solution Overview
Problem
Workers using electric motor-driven tools for tightening threaded members may not be aware of changes in tightening torque settings, leading to unexpected reaction forces, which can cause the tool to slip or fail to apply the correct torque.
Innovation Solution
A control circuit that notifies the worker of a set torque value greater than a reference value before starting the tool, using visual, auditory, or disabling notifications to prepare the user for the increased force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the set value of tightening torque is automatically changed, then the productivity is improved by enabling continuous tightening work for different types of screws, but the worker may not be aware of the setting change and receive unexpected reaction force
Solution Approach 1:
The notification device provides advance warning to the worker before the torque setting is changed or before high torque is applied. This preliminary information delivery allows the worker to prepare mentally and physically for the upcoming change in reaction force, resolving the information loss problem while maintaining automatic torque changing capability for productivity
Solution Approach 2:
The system provides feedback to the worker about the current torque setting through the notification device. This feedback mechanism ensures the worker is aware of the setting state, preventing unexpected reactions when torque changes occur during automatic operation sequences
2Reliability
If the set value of tightening torque is increased, then the tightening effectiveness is improved, but the reaction force applied to the worker's hand increases unexpectedly
Solution Approach 1:
The notification device alerts the worker in advance before high torque is applied or before torque setting is increased. This allows the worker to prepare by adjusting gripping force, converting the harmful unexpected reaction force into a manageable expected force while maintaining the reliability of high torque application
3Ease of operation
If the worker adjusts gripping force in accordance with assumed magnitude of reaction force, then the ease of operation is improved, but the worker cannot always grasp the set value correctly
Solution Approach 1:
The notification device acts as an intermediary between the torque control mechanism and the worker. It translates the technical setting value into a comprehensible warning signal that the worker can reliably understand, eliminating the uncertainty in the worker's grasp of the set value while maintaining ease of operation through proper grip adjustment
Data Source
AI summary
An electric motor-driven tool is configured to make a notification to a worker about a set value of tightening torque as necessary before starting tightening work. An electric motor-driven screwdriver includes an electric motor-driven screwdriver body capable of changing a setting of the magnitude of tightening torque to be applied when tightening a screw, and a notification device for making a notification to a worker about a set value of tightening torque. If the set value of tightening torque has been set to a value greater than a threshold value (reference value), a control circuit of the electric motor-driven screwdriver sends a notification execution signal to the notification device before the electric motor-driven screwdriver body is started to be driven, thereby enabling a notification to the worker to be made by the notification device.