Three-Disc Polishing Head for Uniform Surface Finishing
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Solution Overview
Problem
Existing polishing and/or sanding heads with concentric discs and planet gears fail to achieve a uniformly smooth surface finish due to uneven polishing or sanding results, resulting in areas with differing appearances.
Innovation Solution
Incorporating a third disc that oscillates in two perpendicular directions, connected via a transmission to two rotating discs, ensuring a circular motion about an imaginary axis, thereby smoothing the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two concentric discs with planet gears are used to rotate in opposite directions, then the polishing or sanding action is provided, but the treated surface is not completely smooth and areas with different appearances appear
Solution Approach 1:
The polishing head is segmented into three separate discs instead of two, with the third disc providing an additional independent motion component. This segmentation allows for more complex motion patterns that cover the surface more uniformly, eliminating the appearance differences caused by the two-disc limitation.
Solution Approach 2:
The third disc introduces an additional degree of freedom to the motion system. While the first two discs provide rotation in opposite directions, the third disc adds another rotational dimension, creating a three-dimensional motion pattern that ensures every point on the surface receives consistent polishing or sanding treatment, thereby achieving uniform appearance.
2Productivity
If two discs rotate in opposite directions about a common center, then the polishing action is achieved, but uneven polishing results occur on the surface
Solution Approach 1:
The system transitions from a static two-disc rotation to a dynamic three-disc configuration where each disc can rotate independently. This dynamic arrangement allows the polishing head to adapt its motion pattern continuously, ensuring that high points and low points on the surface receive appropriate polishing pressure, thereby achieving even surface treatment while maintaining efficiency.
Solution Approach 2:
The three-disc configuration creates a periodic motion pattern where the contact points between discs and surface follow a repeating cycle. This periodic action ensures that different areas of the surface are systematically covered over time, preventing the formation of uneven patches and maintaining consistent polishing quality across the entire surface.
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 additional disc provides a more even polishing or sanding result, eliminating areas with deviating appearances on the treated surface.
Implementation Method 1
a transmission present between the disc coupled to the driven axle and/or the coupling and the other disc, which transmission is such that the two discs rotate in opposite directions about a common center during operation
Implementation Method 2
the second transmission comprises at least one third gear meshing with the external teeth of the second gear, said third gear is connected via an eccentric to the third disc
Data Source
AI summary
A polishing and/or sanding head 1 has a frame and three discs movably coupled to the frame. Of these discs, a first disc 5 forms a round inner disc and a second disc 7 is annular and surrounding the first disc. These first and second discs are concentric and rotatable in opposite directions about their common center. The third disc 9 is also annular and is present around the second disc. This third disc is not rotatable but can make a circular movement about an imaginary axis. The discs are provided with a front side 5A-9A, which faces the surface to be treated during operation and on which a polishing or sanding sheet can be applied. Due to the presence of this third disc, which does not make a rotating but an eccentric movement, an even surface is obtained during polishing or sanding, on which no areas with a deviating appearance are present.