Torque Driver Marker Activation via Torque Limiter
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Solution Overview
Problem
Conventional torque drivers with markers suffer from inconsistent marking due to varying ink discharge caused by idling operations after reaching the set torque value, leading to density differences in the marking.
Innovation Solution
A torque driver design where a marker is brought into direct contact with the screw head by utilizing rotation-induced movement, facilitated by a torque limiter and marker activating sections such as repulsive magnetic forces or cam configurations, ensuring consistent and reliable marking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the marker discharges ink through idling operation after reaching set torque, then the marking function is achieved, but the ink discharge amount varies depending on idling angle causing density inconsistency
Solution Approach 1:
The marker is pre-positioned in a retracted state before torque application, and the marking action is triggered automatically when the set torque is reached through the torque limiter mechanism, eliminating the need for operator-dependent idling operations that cause inconsistent ink discharge
Solution Approach 2:
The conventional mechanical idling operation is replaced with a controlled marker activation mechanism that uses the torque limiter's mechanical action to directly drive the marker forward, converting the uncontrolled rotational motion into a precise linear displacement for consistent marking
2Manufacturing precision
If the marker is positioned to contact the screw head directly, then marking precision is improved, but the marker must be reliably activated only at the correct torque point
Solution Approach 1:
The torque limiter mechanism provides mechanical feedback by engaging only when the set torque is reached, automatically triggering the marker activation without requiring external control signals or operator intervention, ensuring reliable and precise activation timing
Solution Approach 2:
The system uses its own operational characteristics (the torque limiter's engagement at set torque) to automatically activate the marker, making the system self-regulating and eliminating dependence on external control systems or operator skill
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for precise and consistent marking on the screw head by moving the marker into direct contact upon reaching the set torque value, preventing ink discharge variations and ensuring reliable marking without failure, with easy marker removal and attachment for improved usability.
Implementation Method 1
the marker can be moved forward smoothly by utilizing repulsive magnetic forces of permanent magnets as the marker activating section
Implementation Method 2
the torque limiter configured by a pair of friction plates that idle a bit engaged with a bit engagement hole such as a cross-shaped hole formed on a head of a screw member
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3(a)~3(c)
AI summary
It is to provide a torque driver capable of bringing a marker into direct contact with a surface of a fastener member such as a screw to perform marking. A torque driver 1 is configured such that a case 10 is rotated relative to a main shaft 20 when a tightening force applied to the case 10 is transmitted to the main shaft 20 through a torque limiter section 30 and a tightening torque on a screw 80 engaged with a bit 70 attached to a coupler 60 fixed at a tip portion of the main shaft 20 reaches a torque value set in the torque limiter section 30. The torque driver 1 includes: a marker 54 extending from an inside of the coupler 60 to a tip portion of the bit 70 along a side surface of the bit 70; and a marker activating section 40 that allows the marker 54 to move forward by utilizing rotation of the case 10 relative to the main shaft 20 so that a marker tip portion 53 is brought into contact with the screw 80 to perform marking.