Fastener Driver Tooth Sensing to Prevent Blade Jamming
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Solution Overview
Problem
Existing powered fastener drivers face issues with component wear and jamming during operation, leading to tool failure and inefficiency.
Innovation Solution
A powered fastener driver with a pressurized gas cylinder, a piston, and a driver blade, equipped with a lifter, drive unit, sensors, and a controller that detects the number of teeth on the driver blade and stops the drive unit when the predetermined number of teeth is not detected, preventing jamming and extending tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driver blade and lifter operate continuously without monitoring, then productivity is maintained, but component wear leads to jamming and tool failure
Solution Approach 1:
The sensor detects the number of teeth on the driver blade before complete wear occurs, and the controller stops the drive unit in advance to prevent jamming. This preliminary detection and intervention prevents the harmful effect of component wear leading to tool failure.
2Reliability
If sensors and controllers are added to monitor tooth count, then reliability improves by preventing jamming, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical monitoring systems with a simple sensor-controller-electromagnet system. The sensor optically detects tooth count, the controller processes the signal, and the electromagnet provides stopping force, substituting mechanical wear indicators with electronic detection.
Solution Approach 2:
The driver blade's own teeth serve as the measurement object for detection. The system uses the existing structural features (teeth) of the driver blade itself to monitor its wear state, eliminating the need for separate wear indicators or complex sensing mechanisms.
3Duration of action of stationary object
If the drive unit is stopped frequently to prevent wear damage, then tool longevity increases, but productivity decreases
Solution Approach 1:
The sensor continuously monitors the number of teeth on the driver blade and provides feedback to the controller. The controller adjusts operation based on this feedback, stopping only when wear reaches critical levels. This feedback mechanism optimizes the balance between operational time and tool life by preventing premature stops while avoiding wear-induced failures.
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 defining a predetermined number of edges. The sensor is configured to detect an edge of 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 edges detected by the sensor, compare the number of detected edges to the predetermined number of edges, and stop the drive unit when the number of detected edges is less than the predetermined number of edges.