Electric Nail Gun Striker Latch Mechanism Without Hall Sensing
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Solution Overview
Problem
The existing electric nail guns suffer from operational instability due to errors in the detection accuracy of the Hall sensing element, leading to premature or delayed extension of relay claws in the striker driving mechanism, which affects normal operation.
Innovation Solution
A striker driving mechanism with a single-sided tooth structure and a passive relay device, featuring an arc-shaped latch projection and triangular projection, ensures smooth ejection and resetting of the striker without the need for real-time detection, using a reset spring to maintain the latch projection against the striker and a controller to manage motor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Hall sensing element is used to detect the rotational position of the driving cam and control the relay device, then the striker can be controlled to reset and accumulate energy, but the detection accuracy errors cause premature or delayed extension of relay claws, leading to operational instability
Solution Approach 1:
The patent replaces the electronic Hall sensing element with a purely mechanical detection system. The driving cam itself mechanically controls the relay device through its rotation, eliminating the need for electronic sensors. The cam's physical shape and rotation directly actuate the relay claws at the correct timing points, ensuring precise control without detection errors.
Solution Approach 2:
The driving cam performs dual functions: it both drives the striker for energy accumulation and simultaneously controls the relay device timing. The cam's rotation automatically triggers the relay claws to extend and retract at the appropriate moments through its mechanical interaction with the relay device, making the system self-regulating without external sensing or control electronics.
2Reliability
If a relay device with extendable relay claws is used to control striker ejection, then the striker can be held in position during energy accumulation, but the complex structure and active control mechanism increase device complexity and potential failure points
Solution Approach 1:
The patent replaces the actively controlled relay device with a passive mechanical latch system. The relay claws are spring-loaded and automatically engage with or disengage from the striker based on its position, eliminating the need for electronic control signals, sensors, and active actuation mechanisms.
Solution Approach 2:
The driving cam acts as an intermediary between the motor and the relay device. Through its specific profile and rotation, it mechanically times the engagement and disengagement of the relay claws with the striker's movement, providing precise control without requiring direct electronic control of the relay device.
3Reliability
If the driving cam completes two rotations for one complete striker reset process, then better energy accumulation is achieved, but the operation time increases and productivity decreases
Solution Approach 1:
The patent makes the cam profile dynamic in its functional output. The cam is designed with varying radial distances from its rotation center to different points on its circumference, allowing it to provide different levels of driving force and control during different phases of rotation. This enables optimized energy accumulation during the two-rotation cycle while minimizing idle time and maintaining high productivity.
Solution Approach 2:
The system uses periodic action through the cam's two-rotation cycle to achieve complete energy accumulation. The cam rotates twice to provide the necessary driving force for the striker to reset and accumulate maximum energy, then rapidly ejects the striker for nailing. This periodic two-rotation pattern is optimized to balance energy accumulation requirements with operational speed.
Data Source
AI summary
A striker driving mechanism for an electric nail gun includes a striker, a driving motor, a gearbox, a driving cam and a relay device. The striker has driving teeth on one side facing the driving cam to engage with pins thereon. A nail driving groove with a locking hole is centrally located on the top surface of the front of the striker. A triangular projection is provided on the striker bottom and in front of the locking hole. The relay device includes a mounting base hinged with one end of a striker support block whose other free end has an arc-shaped latch projection facing upward and connecting a reset spring being pre-compressed to maintain the arc-shaped latch projection always held against the bottom of the striker. The striker having single side tooth structure and a passive catch device simplifies the structure and improves the operational stability.