Fastener Driver Crank-Rack Mechanism for Low-Friction Impact
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Solution Overview
Problem
The existing driving mechanisms for fastener driving machines, such as nailing guns, face issues with high stress inclination and increased kinetic friction due to large angle connecting rod structures, leading to wear and difficulty in quick energy release during energy storage and application.
Innovation Solution
A driving mechanism with a rotatable crank, a driving rack, and guide slots that allow the engaging and support elements to move along specific trajectories, reducing inclination and kinetic friction, and enabling a stable and smooth operation with a simple structure and few parts, facilitating quick release and normal engagement even in nail jamming scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a crank-connecting rod structure is used to convert rotary motion into reciprocating motion, then the driving mechanism can be implemented, but the stress inclination becomes large and kinetic friction force increases when the connecting rod angle is large
Solution Approach 1:
The connecting rod is divided into multiple segments (first connecting rod segment, second connecting rod segment, third connecting rod segment) connected by rotating connections. This segmentation allows each segment to rotate independently, reducing the stress inclination angle and minimizing kinetic friction force between the connecting rod and the impactor throughout the reciprocating motion cycle.
Solution Approach 2:
The patent introduces dynamic rotation capabilities at multiple joints (rotating connection between first and second connecting rod segments, rotating connection between second and third connecting rod segments). These dynamic adjustments enable the mechanism to maintain optimal angles during motion, reducing friction and wear while preserving the reciprocating motion function.
2Length of moving object
If the connecting rod angle becomes large during motion, then the reciprocating motion range increases, but the kinetic friction force of the load increases and the mechanism experiences wear
Solution Approach 1:
By segmenting the connecting rod into multiple rotatable sections, the mechanism achieves the required reciprocating motion range while keeping each segment's angle relatively small. This reduces friction and wear, thereby extending product service life.
Solution Approach 2:
The patent changes the geometric parameters of the mechanism by introducing multiple rotating joints with different rotation radii. This allows the system to maintain a large reciprocating motion range while controlling the inclination angles of individual connecting rod segments, reducing friction and wear.
3Speed
If a complex driving mechanism structure is used to achieve quick release after energy storage medium compression, then quick release can be implemented, but the structure becomes complicated with more parts
Solution Approach 1:
The patent combines the energy storage function and the quick release function into a single integrated driving mechanism. The compressed energy storage medium directly acts on the piston, which is connected to the segmented connecting rod system, eliminating the need for separate quick release mechanisms and simplifying the overall structure.
Solution Approach 2:
The energy storage medium is pre-compressed before operation, storing energy in advance. When quick release is needed, the pre-compressed medium immediately expands, providing instant force through the segmented connecting rod mechanism without requiring complex additional release components.
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
The solution reduces kinetic friction, prevents wear, ensures constant thrust direction, and enhances operational stability and smoothness, improving work quality and marketability by minimizing eccentric loads and allowing normal operation in nail jamming conditions.
Implementation Method 1
the guide element is provided with at least one guide slot as trajectory, the support element and/or engaging element is slideably arranged in the guide slot
Implementation Method 2
a rotatable crank; a driving rack element rotatably installed on crank
Implementation Method 3
the latching device comprises a pendulum bar and a reset element on lateral side of the pendulum bar
Implementation Method 4
the striker is slideably installed in the guide rail, the guide rail is installed on the base
Data Source
AI summary
A driving mechanism for fastener driving machine, including a rotatable crank; a driving rack element rotatably installed on the crank, which comprises an engaging element, a support element and a driving rack; at least one fixed guide element. The support element and/or engaging element can move along the set trajectory. The present invention has a simple structure, a few parts and stable operation. When the crank rotates, the motion trajectory of the engaging element is straight or approximately O°, so as to reduce the kinetic friction force of load to the maximum extent, preventing wear problem, and guaranteeing constant direction of thrust on the impact unit in the course of compressed energy storage and low eccentric load in late stage, the quick release of driving mechanism is implemented, the operational stability and smoothness of impact unit are guaranteed, the work quality is upgraded.