Hand-Held Milling Machine Transverse Drive Eccentric Pendulum
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hand-held milling machines experience significant reaction forces during the milling of elongated holes, leading to potential 'tearing' and unclean holes, especially when using dowels with elongated cross-sections, as the machine must be manually moved back and forth, causing uneven milling paths.
Innovation Solution
The milling machine incorporates a transverse drive device with an eccentric mechanism and adjustable pendulum axles, allowing for a controlled, adjustable amplitude of the pivoting movement of the output shaft, which reduces manual intervention and maintains a consistent feed movement, thereby minimizing reaction forces and ensuring cleaner elongated holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the milling machine is moved back and forth manually during milling, then the slot can be milled, but reaction forces increase causing the machine to jerk and produce unclean slots
Solution Approach 1:
The patent applies dynamics by making the pendulum axis position adjustable during operation. The actuating element allows the user to change the pendulum axis position along the pendulum lever, which dynamically changes the amplitude of the reciprocating pivoting movement of the output shaft. This dynamic adjustment capability enables optimization of the milling process for different slot lengths and material conditions, reducing reaction forces and preventing machine jerking while maintaining clean slot production.
2Adaptability or versatility
If the amplitude of reciprocating pivoting motion is adjusted by pivoting the pendulum axis on an adjusting lever, then slot length can be varied, but the structure becomes complex and prone to malfunctions
Solution Approach 1:
The patent implements parameter changes by providing multiple discrete pendulum axis positions along the pendulum lever. Instead of continuous adjustment, the actuating element selects from several predetermined positions, each corresponding to a specific amplitude of reciprocating motion. This discretized approach achieves versatile slot length adjustment while significantly simplifying the mechanical structure and reducing the risk of malfunctions compared to continuous adjustment mechanisms.
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
This solution allows for a quieter and more precise milling process by maintaining an uninterrupted feed movement, reducing the amplitude of reaction forces and ensuring the milling tool moves in a consistent zigzag path, resulting in cleaner and more accurate elongated holes.
Implementation Method 1
a transverse drive device, which includes an eccentric device controlling the pivoting movement and driven by the drive motor
Implementation Method 2
with a pendulum lever mounted to pivot about a pendulum axis, which is in pivoting connection with the output shaft
Data Source
Figure 1
Figure 2~4
Figure 3~6
AI summary
A swing lever (57) is provided with multiple shaft bodies (71,72,73) with intermeshing sprocket wheels (78,79,80). One of the shaft bodies (72) is coupled to an operating member (65). The shaft bodies and their operating parts (81,82,83) rotate relative to each other so that when the operating member is in different rotational positions, one respective other operating part forms the swing axel (58).