Document Feeder Roller Path Reversal for Stable Conveyance
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Solution Overview
Problem
Existing document feeders face instability in conveying documents during the reading process due to differences in peripheral speed between conveying rollers and the configuration of the conveying path, which can affect image reading quality.
Innovation Solution
A document feeder design featuring a conveying path that reverses the sheet feed direction, with a first conveying roller pair upstream and a second conveying roller pair downstream of the reading position, both above the reading position, and a third conveying roller pair on a post-reading path with a slope, ensuring stable document conveyance and tension management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the downstream conveying roller is set to have greater peripheral speed than the upstream conveying roller, then the document is conveyed stably without curling, but the document behavior becomes unstable at the reading position due to tension release
Solution Approach 1:
The conveying path is divided into multiple segments with different roller pairs (first conveying roller pair upstream, second conveying roller pair at downstream, third conveying roller pair on post-reading path). Each segment manages document tension and speed independently, allowing stable conveyance without curling while preventing instability at the reading position through segmented control of document flow
Solution Approach 2:
The third conveying roller pair acts as an intermediary element on the post-reading conveying path with a slope, mediating the document's transition and maintaining proper tension between the second conveying roller pair and the reading position, thereby preventing document deflection and ensuring stable image reading
2Adaptability or versatility
If the conveying path is configured to reverse sheet feed direction, then both sides of the document can be read sequentially, but document deflection and tension issues occur during the reading process
Solution Approach 1:
The conveying system uses dynamic speed control of multiple roller pairs to adapt to different stages of document conveyance. The first, second, and third conveying roller pairs operate at different peripheral speeds to dynamically manage document tension during the reversal process, preventing deflection and ensuring accurate image reading on both sides
Solution Approach 2:
The third conveying roller pair is positioned on a post-reading conveying path with a slope, introducing a vertical dimension to the otherwise horizontal conveying path. This dimensional change helps manage document tension and prevent deflection during the reversal process, maintaining image reading accuracy
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 design stabilizes document behavior at the reading position, preventing curling and ensuring accurate image reading on both sides without deflection or tension issues, thereby enhancing the reliability of the document feeding process.
Implementation Method 1
The first conveying roller pair... nips and conveys a document passing through the conveying path. The second conveying roller pair... nips and conveys a document passing through the conveying path
Data Source
AI summary
A document feeder includes a conveying path extended from a document supplying position to a reading position, a first conveying roller pair provided upstream from the reading position and nipping and conveying the document, a second conveying roller pair provided downstream from the reading position and nipping and conveying the document faster than the first conveying roller pair, a post-reading conveying path extended downstream from a nipping position of the second conveying roller pair, the post-reading conveying path being located above a plane tangent to the second conveying roller pair at the nipping position running in a reverse sheet feed direction, and a third conveying roller pair provided on the post-reading conveying path and nipping and conveying the document conveyed from the second conveying roller pair at a conveying force equivalent to that of the second conveying roller pair.