Transfer Roller Fluid Distribution with Noncontact Walls to Reduce Wear
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Solution Overview
Problem
Existing fluid distribution systems for rollers, such as anilox rollers, face issues with wear of elastomeric seals and doctor blades, requiring frequent machine interruptions for replacement, and inefficiencies in fluid supply and flow control, including problems with ink leakage, drying, and turbulences.
Innovation Solution
A fluid distribution device with walls at the axial ends of the chamber that do not contact the transfer roller, allowing a controlled laminar flow and eliminating the need for elastomeric seals, featuring a single wiper blade and a pivoting mechanism to compensate for wear, ensuring consistent fluid distribution and circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomeric seals and doctor blades are used to close the chamber at axial ends and control fluid flow, then fluid distribution control is improved, but wear of components increases requiring frequent interruptions
Solution Approach 1:
The patent removes the elastomeric seals from the system entirely. Instead of using seals that contact the roller, the chamber is closed at its axial ends by walls that are spaced from the roller surface, eliminating the source of wear while maintaining chamber closure and fluid control functionality.
Solution Approach 2:
The patent introduces a non-contacting wall structure as an intermediary between the chamber and the roller. These walls spaced from the roller surface provide a gap that allows fluid to pass through while preventing direct mechanical contact, thereby eliminating wear while maintaining fluid distribution control.
2Manufacturing precision
If multiple components (seals, doctor blades, wiper blades) are used to control fluid flow, then fluid distribution precision is improved, but device complexity increases
Solution Approach 1:
The patent eliminates multiple components including elastomeric seals, traditional doctor blades, and wiper blades. The fluid distribution control is achieved through a simplified configuration using spaced walls and gravity-driven fluid flow, reducing the number of parts while maintaining precision.
Solution Approach 2:
The spaced walls serve multiple functions simultaneously: they close the chamber at axial ends, control fluid flow through the gap, and eliminate the need for separate seals and wipers. This multi-functionality reduces device complexity while maintaining fluid distribution precision.
3Reliability
If elastomeric seals contact the transfer roller to prevent leakage, then sealing performance is improved, but wear and maintenance requirements increase
Solution Approach 1:
The patent removes elastomeric seals from the system. The sealing function is achieved by walls that are spaced from the roller surface, creating a gap that prevents leakage without requiring direct contact, thereby eliminating wear and reducing maintenance needs.
Solution Approach 2:
The spaced wall configuration acts as an intermediary that provides sealing functionality without direct contact. The gap between the wall and roller surface prevents fluid leakage while avoiding the wear associated with contacting seals, improving ease of repair.
4Reliability
If traditional fluid supply systems are used with direct contact sealing, then fluid containment is improved, but turbulences and drying problems occur
Solution Approach 1:
The spaced walls create a controlled gap that acts as an intermediary for fluid flow. This gap allows laminar flow of fluid through the chamber ends without causing turbulence or drying, while still maintaining effective fluid containment through the wall structure.
Solution Approach 2:
The patent changes the physical parameter of the chamber ends from direct contact sealing to spaced wall configuration. This parameter change allows fluid to flow through the gap in a controlled laminar manner, preventing turbulence and drying while maintaining containment.
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 wear, minimizes interruptions, maintains fluid consistency, and enhances flow control, preventing leakage and drying, while allowing for efficient recirculation and easy maintenance.
Implementation Method 1
an axially extending wiper blade can be placed at one side of the longitudinal opening, extending in the axial direction and arranged to contact the transfer roller when the machine is in use so as to wipe off excessive fluid
Implementation Method 2
allowing a controlled laminar flow and eliminating the need for elastomeric seals
Data Source
AI summary
A fluid distribution device, for applying a fluid onto a transfer roller, includes an elongated chamber, at least one inlet for letting a fluid into the chamber, a longitudinal opening extending in the axial direction and adapted to face a transfer roller to allow fluid to exit the chamber and contact the transfer roller, and at least one wiper blade extending along at least a portion of the longitudinal opening. The chamber includes, at each of the two axial ends of the chamber, a wall separating the chamber from a cavity. The wall has a wall surface arranged to face the transfer roller when the device is in use. The wall is dimensioned so that the wall surface will be distanced from the transfer roller when the device is in use, so as to allow fluid to be present in a gap between the wall surface and the transfer roller.