Inflatable Pneumatic Stencil Clamp for Uniform Clamping Force
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Solution Overview
Problem
Existing clamping systems for printing screens in printing machines are complex, time-consuming to assemble and repair, and struggle to provide a uniformly distributed load, especially with varying frame sizes and increased printing forces.
Innovation Solution
A pneumatically-actuated inflatable bladder system is used to clamp the printing screen frame, offering a mechanically simpler and more flexible solution that can maintain frames in position across a range of printing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex clamping system with multiple clamping fingers and mechanical components is used, then the frame can be securely clamped, but the assembly and repair time increases significantly
Solution Approach 1:
The patent replaces complex mechanical clamping fingers and linkages with a pneumatic inflatable bladder system. The bladder inflates to apply uniform clamping force across the frame, eliminating numerous mechanical components while maintaining secure clamping. This reduces assembly and repair time significantly while preserving clamping reliability.
Solution Approach 2:
The invention changes the clamping mechanism from discrete mechanical fingers to a continuously adjustable pneumatic system. By controlling inflation pressure, the system adapts to different frame sizes and clamping requirements, providing secure clamping across various configurations without requiring mechanical reconfiguration.
2Force
If traditional mechanical clamping fingers are used, then the frame can be clamped, but the load distribution becomes non-uniform especially with varying frame sizes
Solution Approach 1:
The patent uses an inflatable bladder as a flexible element that conforms to the frame surface. This flexible membrane distributes clamping force uniformly across the entire frame contact area, regardless of frame size variations, eliminating the non-uniform load distribution problem of rigid mechanical fingers.
Solution Approach 2:
The pneumatic inflation system provides hydrostatic pressure distribution throughout the bladder, ensuring uniform force application across the frame. This eliminates the point-contact stress concentrations inherent in mechanical finger systems and achieves consistent load distribution.
3Reliability
If a clamping system with many mechanical parts is used, then the frame can be clamped securely, but the system complexity increases making it harder to maintain
Solution Approach 1:
The patent replaces complex mechanical assemblies with a simple pneumatic bladder system. The bladder is a single-piece elastomeric component with no moving parts, seals, or adjustments required. Maintenance involves simply replacing the bladder if needed, dramatically improving ease of repair while maintaining clamping security.
Solution Approach 2:
The inflatable bladder is designed as a simple, inexpensive, replaceable component. Rather than maintaining complex mechanical assemblies, the system uses affordable bladders that can be quickly replaced if worn, simplifying maintenance procedures and reducing downtime.
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 inflatable bladder system provides a uniform clamping force, simplifies assembly and maintenance, and effectively retains frames during printing processes, improving print quality and accommodating different frame sizes.
Implementation Method 1
A pneumatically-actuated inflatable bladder system is used to clamp the printing screen frame
Implementation Method 2
The inflatable bladder system provides a uniform clamping force
Data Source
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AI summary
A clamping system (31) for clamping a printing screen frame (6) within a printing machine uses at least one inflatable bladder (46) to effect clamping. The clamping system (31) may be modular, so that bladders (46) and / or extending inserts (67) may be exchanged, replaced or incorporated as required.