Powered Fastener Driver Jam Detection Using Blade Tooth Sensing
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Solution Overview
Problem
Existing fastener drivers experience component wear and failure due to jamming issues, which can lead to inefficiencies and tool malfunction.
Innovation Solution
A powered fastener driver equipped with a jam detection system that includes sensors and a controller to monitor the movement of driver blade teeth and lifter position, stopping the drive unit when a jam is detected to prevent damage and alert the operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a powered fastener driver operates continuously without monitoring, then productivity is maintained, but component wear and jamming occur leading to tool failure
Solution Approach 1:
The sensor detects the position of driver blade teeth in advance during normal operation, and the controller proactively stops the drive unit before jamming occurs. This preliminary detection and intervention prevents component wear and failure, extending tool lifespan while maintaining productivity by avoiding unplanned downtime.
2Reliability
If the drive unit operates without monitoring, then operational efficiency is maintained, but jamming causes tool malfunction
Solution Approach 1:
The patent replaces complex mechanical monitoring systems with a simple optical or magnetic sensor that detects tooth position non-contactually. This substitution maintains operational efficiency while minimizing device complexity, as the sensor requires no mechanical connection and the controller uses basic position comparison logic.
3Reliability
If the drive unit stops frequently to prevent wear, then tool lifespan is extended, but productivity decreases
Solution Approach 1:
The sensor provides continuous feedback on driver blade tooth position to the controller, which adjusts operation in real-time. This feedback mechanism allows the system to operate continuously at optimal points, stopping only when necessary to prevent jamming, thereby extending tool lifespan without excessive operational downtime.
Data Source
AI summary
A powered fastener driver includes a housing, a cylinder within the housing, the cylinder containing a pressurized gas, a piston within the cylinder and movable from a top-dead-center position to a bottom-dead-center position, a driver blade movably coupled to the piston, a lifter, a drive unit configured to provide torque to the lifter, and a sensor. The driver blade has a plurality of teeth. The sensor is configured to detect one or more of the plurality of teeth and a controller in communication with the drive unit and the sensor. The controller is configured to count a number of the plurality of teeth detected by the sensor, compare the number of detected teeth to a predetermined number of teeth, and stop the drive unit when the number of detected teeth is less than the predetermined number of teeth.