Air Cushion Table With Variable Duct Geometry For Lightweight Workpiece Support
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Solution Overview
Problem
Air cushion tables in woodworking machines struggle to reliably support workpieces with low surface load, as they require valve actuation to trigger the air cushion, which can be difficult for small or lightweight pieces and may lead to contamination and blockage issues.
Innovation Solution
The air cushion table design features air outlet ducts with a constant lower section and a wider upper section, eliminating the need for pin-actuated valves by increasing the air bearing surface without expanding the air outlet channel flow, allowing for more outlets and reduced power consumption, while minimizing clogging risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pin-actuated valves are used in air outlet openings, then contamination and blockage of air-conducting areas can be prevented, but workpieces with low surface load cannot reliably open the valve and trigger the air cushion
Solution Approach 1:
The invention extracts and eliminates the pin-actuated valve mechanism from the air outlet openings. By removing this mechanical activation component, the system allows workpieces of any weight to directly trigger the air cushion through their presence alone, eliminating the activation problem for lightweight pieces while maintaining contamination protection through the duct design itself
Solution Approach 2:
The air outlet duct with its specific geometry (narrow lower section, wider upper section) serves as an intermediary structure that replaces the valve mechanism. It mediates between the compressed air supply and the workpiece by creating a flow resistance that generates sufficient air pressure to lift even lightweight workpieces without requiring mechanical valve actuation
2Area of stationary object
If the number of air outlet openings is increased, then the air bearing surface is increased and low surface load workpieces can be supported, but the installation effort and costs increase
Solution Approach 1:
The invention segments the air outlet system into multiple individual air outlet ducts, each with its own optimized geometry. This segmentation allows each duct to independently generate sufficient air pressure to support workpieces, enabling the system to handle lightweight pieces effectively while the modular nature of segmented ducts simplifies installation compared to alternative designs
Solution Approach 2:
The air outlet ducts exhibit local quality variations along their length - a narrow lower section for flow control and a wider upper section for pressure generation. This localized geometric optimization allows each duct to function effectively as a standalone air bearing element, enabling increased number of outlets without proportionally increasing complexity
3Quantity of substance
If the flow cross section of air outlet channels is expanded to increase air volume flow, then more air can be supplied to support workpieces, but the installation effort and power consumption increase
Solution Approach 1:
The invention changes the geometric parameters of the air outlet ducts by creating a non-uniform cross-section along the flow direction. The transition from a narrow lower section to a wider upper section optimizes the air flow characteristics, generating sufficient air volume and pressure to support workpieces without requiring a proportional increase in overall flow cross-section or power consumption
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 design enables the support of workpieces with low surface load without valve actuation, reduces installation effort and costs, and minimizes the risk of surface damage and clogging, while maintaining load capacity and efficient airflow.
Implementation Method 1
a compressed air source, which provides a volume flow of preferably compressed air
Implementation Method 2
The workpiece then floats on an air cushion and can easily be moved horizontally above the support surface
Implementation Method 3
A first, lower section has a constant cross section and represents a defined flow resistance
Data Source
Figure 1
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Figure 3
AI summary
The airbearing table has an air supply opening, an upper bearing surface (11) with multiple air outlet openings, and an air distributor for connecting the air supply opening with the multiple air outlet openings (20). The air distributor is connected with each air outlet opening over an air outlet channel which extends from the air distributor to the air outlet openings and which has a section lying below the upper bearing surface.