Oil Damper Clocking for Pneumatic Nailing Tools
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Solution Overview
Problem
Existing nailing machines driven by compressed air struggle with stable continuous driving operations due to the need for electrical power or mechanical clocking mechanisms that increase operating load and vary operating feel, making them unsuitable for quick work.
Innovation Solution
A driving tool with a fluid-driven mechanism and an oil damper clocking mechanism that uses resistance from oil viscosity to control the movement of a moving member, allowing stable switching between actuation states without increasing operating load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electric timer is used for clocking in continuous driving mode, then stable clocking control is achieved, but the device complexity increases due to requiring power supply and circuit components
Solution Approach 1:
The patent replaces the electric timer-based clocking mechanism with a purely mechanical clocking mechanism that utilizes the existing fluid pressure system. The clocking is achieved through mechanical components such as springs, levers, and timing mechanisms that are actuated by the fluid pressure during the driving cycle, eliminating the need for electrical power supply and circuits while maintaining reliable clocking control.
Solution Approach 2:
The mechanical clocking mechanism is designed to be self-regulating using the energy already present in the fluid pressure system. The timing components are automatically actuated by the pressure changes during the driving cycle, requiring no external power source or additional control systems, thus reducing device complexity while maintaining functional reliability.
2Device complexity
If a mechanical clocking mechanism is incorporated into the trigger, then the device complexity is reduced, but the clocking stability deteriorates due to limited space and difficulty in stable performance
Solution Approach 1:
The patent relocates the clocking mechanism from the trigger assembly to the fluid pressure system, utilizing the pressure chamber and fluid flow path as the basis for timing. This dimensional shift allows the clocking mechanism to be integrated into the existing fluid system without compromising space constraints, while the fluid pressure provides a stable and consistent timing reference that enhances clocking reliability.
Solution Approach 2:
The fluid pressure system serves dual functions: it provides the driving force for the piston and simultaneously acts as the basis for the clocking mechanism. By using the same fluid pressure for both actuation and timing, the patent achieves stable clocking without adding separate mechanical components to the trigger, thereby maintaining simplicity while improving reliability.
3Device complexity
If an oil damper is used as a mechanical clocking mechanism, then the device complexity is reduced, but the ease of operation deteriorates due to increased operating load and variation in operating feel
Solution Approach 1:
The patent extracts the damping function from the operator's direct interaction path by incorporating it into the fluid pressure system's return stroke. The oil damper is positioned to affect only the piston's return movement, separating the damping effect from the trigger actuation. This allows the operator to pull the trigger with consistent, light force while the damper independently controls the return speed, maintaining ease of operation while achieving reliable clocking.
Solution Approach 2:
The patent designs the oil damper to provide dynamic resistance that adapts to the piston's movement phase. The damping force is applied only during the return stroke when fluid pressure drives the piston back, while the triggering action experiences minimal resistance. This dynamic behavior ensures consistent operating feel during actuation while achieving the desired clocking effect during the return phase.
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
Enables stable, predictable continuous driving operations without increasing the operating load, ensuring consistent performance and preventing undesired operations.
Implementation Method 1
The oil damper is a configuration of applying a load to movement of the piston by resistance of oil, in which if the piston is moved by a force of a spring, time required for the movement can be used for clocking, by reducing a moving speed of the piston with the force of the spring and keeping the moving speed of the piston constant
Data Source
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AI summary
A nailing machine (1A) includes an oil damper (91) configured to perform clocking of a time period for switching between presence and absence of actuation of a driving cylinder (2). The oil damper (91) performs clocking by controlling movement speed of a moving member (92) when the moving member (92) moves from a clocking starting position where clocking is started to an initial position where clocking is ended. The nailing machine (1) includes a blowback chamber (31) to which compressed air is supplied from the driving cylinder (2) and an air cylinder (93) supplied with compressed air from the blowback chamber (31). The oil damper (91) moves the moving member (92) from the starting position to the initial position by being driven by the air cylinder (93).