Sheet Turning Airflow Layout to Prevent Coating Contact
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Solution Overview
Problem
Existing sheet conveying apparatuses face issues where sheets, particularly those with undried coatings, may contact turning portions due to insufficient flotation, leading to potential damage or separation of the coating.
Innovation Solution
A sheet conveying apparatus design with a first conveying portion that ejects air to float the sheet, a turning portion with a convex curve featuring a first air ejection portion generating larger flotation than a second air ejection portion, and a second conveying portion to prevent contact with the turning portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sheet is conveyed through a turning portion with insufficient flotation, then the sheet can be flipped, but the sheet contacts the turning portion causing potential damage to the coating
Solution Approach 1:
The patent employs air ejection portions that喷射 air between the sheet and the turning portion to generate flotation. This pneumatic approach creates an air cushion that prevents the sheet from contacting the turning portion, thereby avoiding coating damage while enabling smooth flipping operation.
Solution Approach 2:
The air ejection portions are positioned upstream and downstream of the convex curve to provide flotation in advance and during the critical turning phase. By ejecting air before and during the sheet's contact with the turning portion, the system ensures continuous flotation to prevent coating damage.
2Reliability
If air ejection is uniform along the convex curve, then the sheet floats, but the sheet may still contact the upstream end region where flotation is insufficient
Solution Approach 1:
The patent implements non-uniform air ejection by positioning a first air ejection portion upstream and a second air ejection portion downstream, with the first portion generating larger flotation. This local differentiation addresses the specific need for enhanced flotation at the upstream end region where the sheet first encounters the turning portion.
Solution Approach 2:
The air ejection system is designed asymmetrically with the first air ejection portion generating larger flotation than the second air ejection portion. This asymmetric configuration matches the asymmetric nature of the turning process, where the upstream region requires greater flotation support.
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 design effectively prevents sheet contact with the turning portion by maintaining consistent and enhanced flotation, ensuring the sheet is flipped without damaging the coating.
Implementation Method 1
the first conveying portion includes an air nozzle that ejects air toward the first surface of the sheet, and the sheet being allowed to float by the ejected air
Implementation Method 2
the first air ejection portion ejects air to generate flotation larger than that of the second air ejection portion
Data Source
AI summary
A sheet conveying apparatus includes: a first conveying portion in which a band-shaped sheet including a first surface and a second surface is conveyed with the first surface facing downward; a turning portion located downstream of the first conveying portion and flips the sheet with the first surface facing inward; and a second conveying portion located downstream of the turning portion. The turning portion includes a convex curve along which the sheet is flipped. The convex curve includes a first and a second air ejection portions. The first air ejection portion is located in an upstream end region and ejects air toward the first surface of the sheet. The second air ejection portion is located downstream of the upstream end region and ejects air toward the first surface. The first air ejection portion ejects air to generate flotation larger than that of the second air ejection portion.