Variable Vacuum Belt Plenum for Media Acquisition
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Solution Overview
Problem
Existing vacuum belt transport systems in electrophotographic marking and media handling applications lack the ability to provide variable vacuum levels, leading to inefficiencies in media acquisition and transport due to consistent vacuum force distribution, which results in increased vacuum losses during the transport phase.
Innovation Solution
A variable vacuum belt transport system with three parallel rows of vacuum plenums during acquisition and two rows during transport, utilizing a vacuum belt with corresponding hole configurations to maximize acquisition vacuum while minimizing losses by aligning additional plenums with belt holes during acquisition and reducing plenum area during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous plenums run through the transport portion to provide consistent vacuum, then vacuum force is maintained over the length of the transport belt, but vacuum pressure is reduced during acquisition due to air volume losses through the holes
Solution Approach 1:
The plenum is divided into separate acquisition and transport portions. The acquisition plenum has three rows of vacuum holes aligned with three rows of plenums to maximize acquisition vacuum. The transport plenum has only two outer rows of vacuum holes aligned with two outer rows of plenums, with the middle row blocked by a non-perforated belt surface. This segmentation allows independent optimization of vacuum for each function.
Solution Approach 2:
Different vacuum characteristics are applied to different zones: the acquisition zone uses three rows of plenums for maximum vacuum force, while the transport zone uses only two outer rows to minimize air volume losses. The middle row of belt holes is deliberately left unaligned with plenums during transport to reduce vacuum losses while maintaining sufficient holding force.
2Force
If additional vacuum is provided during acquisition, then media acquisition is improved, but overall pressure for acquisition decreases due to losses around the media during transport
Solution Approach 1:
The system dynamically adjusts the vacuum configuration by translating the belt so that different plenum rows align with belt holes at different stages. During acquisition, three rows of plenums align with three rows of belt holes. During transport, the belt translation causes only two outer rows to align, dynamically reducing the vacuum source area to match the reduced need for vacuum force.
3Force
If more holes are aligned with plenums during transport, then more vacuum force is available, but vacuum loss increases due to increased air volume through the holes
Solution Approach 1:
The transport portion uses only two outer rows of plenums with corresponding belt holes, while the middle row of belt holes passes over a non-perforated belt surface without plenum alignment. This creates local quality differences where vacuum is applied only where needed for transport, minimizing total air volume losses while maintaining sufficient vacuum force for media transport.
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 configuration allows for higher vacuum during media acquisition and reduced vacuum loss during transport, ensuring effective media handling by optimizing vacuum pressure distribution across different stages of the process.
Implementation Method 1
vacuum belt transport system with three parallel rows of vacuum plenums during acquisition and two rows during transport
Implementation Method 2
The total vacuum pressure is a function of the amount of vacuum plenum area open to atmosphere through the holes in the belt
Data Source
AI summary
This invention provides a vacuum belt media transport system wherein the media is held on the belt via vacuum pressure. The vacuum force is higher at the media acquisition location and is lower at the subsequent media transport and delivery stage. The vacuum pressure is provided by vacuum plenums located in the system causing vacuum pressure through holes in the belt throughout its length.