Sheet Stacker Overpressure Guide Prevents Media Collapse
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Solution Overview
Problem
Existing sheet stackers face challenges in preventing sheets from collapsing during flipping, especially when dealing with long or weak/flexible media, which can collapse due to local weakening from the printing process.
Innovation Solution
The method involves flipping a sheet while maintaining an overpressure inside the sheet by directing a pressurized gas flow towards the inside of the sheet, ensuring the trailing portion contacts a guide member to maintain the overpressure and prevent collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a flipping wheel is used to flip sheets, then the sheet can be stacked efficiently, but the sheet may collapse upon itself during flipping
Solution Approach 1:
A guide member is introduced as an intermediary element between the sheet and the stacking surface. The guide member supports the trailing portion of the sheet during flipping, preventing collapse while allowing efficient stacking. The guide member acts as a mediator that transfers support force to the sheet without interfering with the flipping motion.
Solution Approach 2:
A gas flow system is used to apply pressure to the trailing portion of the sheet during flipping. The gas flow prevents the sheet from collapsing by maintaining buoyancy or pressure support, enabling the sheet to be flipped without structural failure while maintaining stacking efficiency.
2Stability of the object's composition
If gas flow is used to support the sheet during flipping, then the sheet collapse is prevented, but the device complexity increases
Solution Approach 1:
The guide member serves as a simple mechanical intermediary that provides support without requiring complex gas flow systems. This mechanical approach reduces device complexity while still preventing sheet collapse during the flipping process.
3Stability of the object's composition
If the trailing portion of the sheet is supported during flipping, then the sheet radius of curvature is maintained, but the flipping speed may be reduced
Solution Approach 1:
The gas flow system provides instantaneous support to the trailing portion of the sheet, allowing the sheet to maintain its radius of curvature without mechanical contact that would slow the flipping process. The pneumatic support enables faster flipping by eliminating friction and mechanical resistance.
Solution Approach 2:
The guide member provides support in a way that minimizes friction and resistance to the flipping motion. By designing the guide member to contact only the trailing portion and allow smooth movement, the flipping speed is maintained while still preventing sheet collapse.
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 approach effectively maintains the sheet's radius of curvature, preventing collapse and ensuring efficient stacking, even with weak or locally weakened media.
Implementation Method 1
forming an overpressure in an inner volume of the bent sheet during flipping
Implementation Method 2
directing a pressurized gas flow towards the inside of the sheet
Data Source
AI summary
When using a flipping wheel to flip sheets of weak or long media, there is a risk that these sheets collapse upon themselves. To reduce this risk, a method of stacking sheets includes flipping a sheet while holding its leading edge and bringing the leading edge down towards a stack support; bringing a trailing portion of the sheet into contact with a guide member positioned over the stack support; forming an overpressure in an inner volume of the bent sheet during flipping, while its trailing portion is in contact with the guide member; and maintaining the overpressure and contact while a trailing edge of the sheet travels along the guide member.