Fastener Driving Tool With Direction-Matched Drive Wheel Motion
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Solution Overview
Problem
Conventional pneumatic nail guns suffer from instable thrust and high unbalanced load due to the crank-connecting rod construction, leading to jamming and deteriorated work efficiency.
Innovation Solution
A fastener driving tool with a drive assembly that adapts the rotating direction of a drive wheel to the movement direction of a striker, allowing for stable thrust and smooth movement by switching between engaged and disengaged states of a transmission construction, ensuring the drive wheel does not hinder the striker's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a crank-connecting rod construction is used to drive the piston to compress air, then the nail gun can achieve reciprocating motion, but the thrust becomes unstable and unbalanced load increases causing the piston to jam
Solution Approach 1:
The patent extracts and eliminates the crank-connecting rod mechanism from the system. Instead of using a crank-connecting rod construction to drive the piston, the invention directly drives the piston through a drive wheel that rotates in the same direction as the striker's movement, removing the source of unstable thrust and unbalanced load that caused jamming.
Solution Approach 2:
The patent inverts the traditional driving mechanism approach. Rather than using a crank-connecting rod to convert rotational motion to reciprocating motion (which causes instability), the invention directly couples the drive wheel's rotation with the striker's linear movement, making the drive wheel rotate in the same direction as the striker moves, thereby achieving stable thrust without jamming.
2Ease of operation
If the drive wheel rotates in the opposite direction to the striker's movement, then the transmission construction can be engaged, but the drive wheel may jam during rotation about its own central axis
Solution Approach 1:
The patent inverts the traditional approach by making the drive wheel rotate in the same direction as the striker's movement rather than the opposite direction. This inversion eliminates the jamming issue that occurs when the drive wheel rotates about its own central axis during transmission engagement, while still maintaining effective power transmission.
3Power
If the transmission construction remains continuously engaged, then power transmission is continuous, but the drive wheel hinders the striker's downward movement during nail driving
Solution Approach 1:
The patent applies dynamics by making the transmission construction's engagement state variable rather than fixed. The transmission construction dynamically switches between engaged and disengaged states: engaged during the upward return stroke to provide continuous power transmission, and disengaged during the downward nail-driving stroke to eliminate interference and improve productivity.
Data Source
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AI summary
Disclosed is a fastener driving tool, which relates to the field of power tools, including: an energy accumulation assembly, a striker, and a drive assembly, the drive assembly including a power unit, a drive wheel, and a transmission construction, the power unit being provided with an output shaft, the drive wheel being fitted with the striker, the drive assembly being provided with the transmission construction, the transmission construction having an engaged state and a disengaged state, the power shaft driving, via the transmission construction in the engaged state, the drive wheel to rotate forwardly so that the forwardly rotating drive wheel drives the striker and the piston to move upward to return in place; the transmission construction is in the disengaged state during a process of the piston driving the striker to move from a ready position to a striking position so that the drive wheel fitted with the striker may be driven by the downwardly moving striker to rotate reversely. Since the rotation direction of the drive wheel may be adapted to the movement direction of the striker, thrust stability of driving the striker to return in place is ensured, the drive wheel is free of jam, and the movement smoothness of the striker is enhanced.