Adjustable Fluffer Nozzles for Specialty Sheet Feeding
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Solution Overview
Problem
Current high-speed xerographic copy reproduction machines face challenges in reliably feeding specialty media, such as perforated or multi-layered sheets, due to air flow barriers and varying thicknesses, leading to mis-feeds and multi-feeds, which existing top vacuum corrugation feeders struggle to overcome.
Innovation Solution
The introduction of adjustable inboard and outboard fluffer nozzles that can angle their air flow towards the lead or trail edge of the sheet stack and adjust their cross-sectional throat size, allowing optimized air velocity and positioning to effectively separate sheets, even with specialty media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed front stack fluffer nozzles are used, then sheet separation is improved, but adaptability to specialty media is insufficient
Solution Approach 1:
The fluffer nozzles are made adjustable in position and angle, transforming a static system into a dynamic one that can adapt to different media types. The nozzles can be repositioned along the stack and angled to direct air flow toward lead or trail edges, enabling reliable separation of specialty media such as perforated, multi-layered, and heavy weight stocks.
Solution Approach 2:
The system allows changing of physical parameters including nozzle position, nozzle angle, and air flow direction. These parameter adjustments enable the same nozzle system to effectively handle various specialty media by optimizing air flow characteristics for each media type's specific requirements.
2Reliability
If air velocity is increased to separate specialty sheets, then sheet separation is improved, but sheet damage risk increases
Solution Approach 1:
Instead of uniformly increasing air velocity across the entire stack, the system applies air flow locally at specific positions and angles. The adjustable nozzles can be positioned to target specific areas (lead edge or trail edge) and angled to direct air flow precisely where needed, achieving effective separation without subjecting the entire sheet to excessive air velocity that could cause damage.
Solution Approach 2:
The fluffer nozzles perform preliminary separation action by creating air flow barriers and inducing flutter before the main air knife separation. This preliminary action reduces the force needed during the actual separation event, preventing sheet damage while ensuring reliable separation of specialty media.
3Reliability
If air flow is directed at the stack to separate sheets, then sheet separation is improved, but sheet flutter and mis-feed increase
Solution Approach 1:
The system uses asymmetric air flow application by positioning nozzles at specific locations and angling them to create controlled, non-uniform air flow patterns. This asymmetric approach directs air flow preferentially at the lead edge or trail edge rather than uniformly across the stack, achieving separation while minimizing symmetric flutter that causes mis-feeds.
Solution Approach 2:
The adjustable fluffer nozzles act as intermediaries between the air supply and the sheet stack. They mediate the air flow by controlling its direction, position, and distribution, creating a controlled air barrier that separates sheets without causing excessive flutter or mis-feed conditions.
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 significantly reduces shutdown rates and enables reliable feeding of non-standard media types by ensuring proper separation of sheets, minimizing the risk of mis-feeds and multi-feeds, and preventing sheet damage.
Implementation Method 1
adjustable inboard and outboard fluffer nozzles that can angle their air flow towards the lead or trail edge of the sheet stack
Implementation Method 2
The air knife may cause the second sheet to vibrate independent of the rest of the stack in a manner referred to as 'flutter'
Implementation Method 3
a vacuum plenum with a plurality of friction belts arranged to run over the vacuum plenum
Implementation Method 4
the vacuum pulls the separated sheet up and acquires it
Data Source
AI summary
Both the inboard and outboard fluffer nozzles of a top vacuum corrugation feeder are configured to allow adjustability in angle of air flow. This is to allow the direction of the air to be angled more towards the lead edge or trail edge of a top few sheets in a stack of specialty sheets. The fluffer nozzles are also adjustable in a horizontal plane for positioning at desired locations along the sheet stack. This allows the air to overcome barriers created by the design of specialty media that would otherwise trap the air and prevent it from being distributed between sheets. The cross-section of the nozzles is also adjustable, providing a smaller or wider throat in order to allow the air velocity to be optimized to best separate the sheets in problem areas.