Conveying Roller Profile for Wrinkle-Free Medium Feeding
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Solution Overview
Problem
Existing medium conveying apparatuses face issues with medium wrinkling due to forces applied by feed rollers, leading to image unevenness, while applying forces to prevent wrinkling can cause paper breakage.
Innovation Solution
The apparatus employs feed roller pairs and conveying roller pairs with specific diameter differences and orientations to minimize wrinkling and breakage by optimizing the force application on the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a force is applied from both ends toward the center side by feed rollers to separate and feed media, then medium separation and feeding are achieved, but wrinkles occur in the medium causing color unevenness in captured images
Solution Approach 1:
The patent introduces a pair of pressing rollers as an intermediary component between the feed rollers and the medium. These pressing rollers apply a controlled pressing force to the medium during conveyance, preventing wrinkles caused by the feed rollers while maintaining proper medium separation and feeding. The pressing rollers act as a mediator that resolves the conflict between effective medium handling and image quality preservation.
2Manufacturing precision
If a simple force is applied from the center side toward both end sides to prevent wrinkles, then wrinkle occurrence is reduced, but thin paper medium breaks (ruptures)
Solution Approach 1:
The patent applies local quality by positioning the pressing rollers at specific locations that correspond to the wrinkle-prone areas of the medium, rather than applying force uniformly across the entire medium. The pressing rollers apply localized pressing forces only where needed to prevent wrinkles, avoiding excessive force on thin paper that would cause breakage. This localized approach allows wrinkle prevention while preserving medium integrity.
3Productivity
If feed rollers apply separation force to convey medium, then medium feeding is achieved, but forces from both ends toward center cause deflections and wrinkles
Solution Approach 1:
The pressing rollers serve as an intermediary that stabilizes the medium during the conveyance process. While the feed rollers continue to perform their separation and feeding function, the pressing rollers simultaneously apply controlled pressing forces to maintain medium flatness and prevent deflections. This intermediary component allows efficient medium conveyance while preserving medium stability and flatness.
Data Source
AI summary
A medium conveying apparatus includes feed roller pairs spaced and located in a direction perpendicular to a medium conveying direction, to separate and feed a medium, and conveying roller pairs located on a downstream side of the feed roller pairs in the medium conveying direction, and spaced and located in the direction perpendicular to the medium conveying direction. For each of the conveying roller pairs, a diameter of an outer end in the direction perpendicular to the medium conveying direction of at least one conveying roller is larger than a diameter of an inner end in the direction perpendicular to the medium conveying direction of said conveying roller, and a total D of differences between the diameter of the outer end and the diameter of the inner end of each conveying roller is 0.06 mm or more and 1.00 mm or less.