Vacuum Transport Belt Aperture Control for Media Hold Down
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Solution Overview
Problem
Vacuum transport systems in printers face challenges with flow losses and reduced effectiveness when handling smaller media, leading to increased cost, power consumption, noise, and media distortion, due to traditional designs that overpower the system with larger vacuum blowers and result in inconsistent hold down across varying media sizes.
Innovation Solution
A vacuum transport system with a belt featuring an array of holes aligned to process direction grooves in a vacuum plenum plate, and sliding aperture plates that control air flow and vacuum pressure through contoured holes and slots, allowing for customization of active areas to accommodate different media widths, reducing flow losses and blower size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If larger vacuum blowers are used to maintain vacuum pressure for smaller media, then vacuum hold down effectiveness is improved, but power consumption increases
Solution Approach 1:
The plenum chamber is divided into multiple independently controllable vacuum zones using movable aperture plates. Each zone can be activated or deactivated based on media size, allowing the vacuum system to provide appropriate hold down force only where needed rather than across the entire belt surface.
Solution Approach 2:
Movable aperture plates with contoured holes and slots dynamically adjust the active vacuum area in response to detected media size. The aperture plates slide to open or close holes connecting grooves to the vacuum plenum, progressively changing the vacuum distribution pattern to match the media width.
2Reliability
If larger vacuum blowers are used to maintain vacuum pressure for smaller media, then vacuum hold down effectiveness is improved, but noise increases
Solution Approach 1:
The plenum chamber is divided into multiple independently controllable vacuum zones using movable aperture plates. Each zone can be activated or deactivated based on media size, allowing the vacuum system to provide appropriate hold down force only where needed rather than across the entire belt surface.
Solution Approach 2:
Movable aperture plates with contoured holes and slots dynamically adjust the active vacuum area in response to detected media size. The aperture plates slide to open or close holes connecting grooves to the vacuum plenum, progressively changing the vacuum distribution pattern to match the media width.
3Reliability
If larger vacuum blowers are used to maintain vacuum pressure for smaller media, then vacuum hold down effectiveness is improved, but media distortion increases
Solution Approach 1:
The plenum chamber is divided into multiple independently controllable vacuum zones using movable aperture plates. Each zone can be activated or deactivated based on media size, allowing the vacuum system to provide appropriate hold down force only where needed rather than across the entire belt surface.
Solution Approach 2:
Different regions of the vacuum belt provide different vacuum pressures tailored to the local media width. The movable aperture plates create a vacuum distribution pattern that matches the media dimensions, providing strong hold down where media is present and reducing or eliminating vacuum where media is absent, preventing distortion.
4Loss of energy
If vacuum hole patterns are localized to accommodate smaller media, then flow losses are reduced, but vacuum pressure consistency worsens
Solution Approach 1:
Movable aperture plates with contoured holes and slots dynamically adjust the active vacuum area in response to detected media size. The aperture plates slide to open or close holes connecting grooves to the vacuum plenum, progressively changing the vacuum distribution pattern to match the media width.
Solution Approach 2:
A single vacuum transport system with movable aperture plates can accommodate multiple media sizes (from small cards to large posters) by dynamically reconfiguring the active vacuum area. The same hardware provides optimized vacuum distribution for different media dimensions without requiring separate systems.
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 solution minimizes flow losses with smaller media, reduces noise and power requirements, lowers manufacturing costs, and ensures consistent media hold down across a wide range of sizes, enhancing system latitude and efficiency.
Implementation Method 1
Vacuum chamber 116 is actuated by a vacuum blower 118 and thereby draws air through the holes in belt 110
Implementation Method 2
vacuum blower 118 and thereby draws air through the holes in belt 110 particularly in the area where a sheet moving in a process direction is passing over the belt 110
Implementation Method 3
Sliding aperture plates on the underside of the plenum plate inside the vacuum plenum contain a series of specifically contoured holes and slots to progressively open or shut holes connecting the grooves to the vacuum plenum to control air flow and vacuum pressure
Data Source
AI summary
A vacuum transport system includes vacuum plenum having a plenum plate as a part thereof and a belt with an array of holes that align to grooves in the plenum plate over which the belt is driven. A sliding plate on the underside of the plenum plate inside the vacuum plenum contains a series of holes and slots to progressively open or shut holes connecting the grooves to the vacuum plenum to maintain a constant air flow and vacuum pressure in the cross process direction for varying widths of media.