Latch Position Sensing for Fastener Driver Alignment Control
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Solution Overview
Problem
Existing fastener driving tools face issues such as the driver stopping at out-of-specification positions, leading to potential jamming or breakage due to improper engagement with the lifter, and fastener jams causing mechanical interference, which can go unnoticed during high-cycle operations.
Innovation Solution
Incorporation of a latch position sensor, such as a Hall-effect sensor, to detect the alignment of a movable latch with driver openings, preventing the lifter from engaging if the driver is out of position, and a dynamic braking circuit to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driver stops at out-of-specification positions due to wear or fastener jams, then the tool continues operating without interruption, but the lifter may engage improperly causing jamming or breakage
Solution Approach 1:
The latch position sensor detects the driver's position at the end of the driving stroke before the lifter engagement occurs. By detecting whether the driver has reached the correct position in advance, the system can prevent improper lifter engagement and potential damage before it happens.
Solution Approach 2:
The latch position sensor provides feedback about the driver's position to the control system. This feedback mechanism allows the control system to monitor driver position accuracy and take corrective action if the driver stops at an out-of-specification position, thereby maintaining reliability while allowing continuous operation.
2Reliability
If a latch position sensor is added to detect driver position and prevent improper engagement, then tool damage is prevented, but device complexity increases
Solution Approach 1:
The latch position sensor acts as an intermediary component between the driver mechanism and the lifter control system. It provides critical position information without requiring direct mechanical connection between the driver and control system, simplifying the overall design while maintaining reliability.
Solution Approach 2:
The patent replaces complex mechanical position detection mechanisms with an electronic latch position sensor. This substitution reduces mechanical wear and complexity while providing more reliable and precise position detection for controlling lifter engagement.
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
Prevents tool damage by ensuring the driver is correctly positioned for lifting, reducing mechanical stress and extending tool lifespan by preventing improper lifter engagement and potential breakage.
Implementation Method 1
Incorporation of a latch position sensor, such as a Hall-effect sensor, to detect the alignment of a movable latch with driver openings
Data Source
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AI summary
A powered fastener driving tool including a latch with a position sensor, to detect the position of the driver during tool operation. The sensor communicates to the system controller, which determines, based on the position of the latch, if the motor should be energized or the motor braking energized. This latch sensor detection provides an accurate location of the driver to the system controller, helping prevent wear and tear on the lifter and driver, and increasing the life of the tool. The driver includes a plurality of through holes, in which the latch can engage when properly aligned. When the latch is engaged with a through hole, the sensor communicates to the controller than the motor may be energized. However, when the latch is not engaged with a through hole, the sensor communicates to the controller that the motor brake should be energized.