Movable Media Guides for Jam-Free Thin and Thick Sheet Conveyance
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Solution Overview
Problem
Conventional medium conveying apparatuses face issues with jams when conveying media of varying thicknesses, such as thin papers causing misalignment and thick media like plastic cards or passports leading to slip between conveyance rollers.
Innovation Solution
A medium conveying apparatus with a pair of conveyance rollers and guides that adjust their spacing dynamically based on the thickness of the medium, using movable guides to ensure proper alignment and contact with rollers, preventing jams and ensuring sufficient conveying force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed guides are used to align the medium, then thin media can be conveyed without jams, but thick media cause slip between conveyance rollers
Solution Approach 1:
The guide plates are made movable in the conveyance direction, allowing them to dynamically adjust their positions based on the thickness of the medium being conveyed. This enables the guide plates to maintain optimal alignment for both thin and thick media, resolving the contradiction between reliable conveyance of thin media and adaptability to thick media.
Solution Approach 2:
The position of the guide plates is changed as a variable parameter based on medium thickness. By adjusting the guide plate positions, the system adapts to different medium thicknesses, ensuring proper alignment and preventing both jams and slips during conveyance.
2Manufacturing precision
If the guide plates are positioned for thin media, then alignment is precise, but thick media cannot be conveyed properly
Solution Approach 1:
The guide plates are designed to move dynamically in response to different medium thicknesses. When thin media are detected, the guide plates position themselves to provide precise alignment; when thick media are detected, they adjust to accommodate the increased thickness, maintaining compatibility across various media types.
Solution Approach 2:
The movable guide plate mechanism serves multiple functions: it provides precise alignment for thin media while also accommodating thick media. This multi-functionality allows a single guide system to handle various media types effectively, resolving the contradiction between precision and versatility.
3Adaptability or versatility
If the guide plates are positioned for thick media, then thick media can be conveyed, but thin media cause jams
Solution Approach 1:
The guide plates dynamically adjust their positions based on the detected medium thickness. When thick media are present, the guide plates position themselves to accommodate the thickness; when thin media are present, they adjust to maintain precise alignment, ensuring reliable conveyance without jams.
Solution Approach 2:
The guide plate position parameter is adjusted based on medium thickness detection. This parameter change enables the system to switch between accommodating thick media and maintaining precise alignment for thin media, resolving the contradiction between adaptability and reliability.
4Device complexity
If a single guide position is used, then the structure is simple, but it cannot accommodate varying media thicknesses
Solution Approach 1:
The guide plates are made movable rather than fixed, adding dynamic capability to the guide structure. This allows the simple guide structure to adapt to varying media thicknesses through positional adjustments, maintaining low complexity while achieving high adaptability.
Data Source
AI summary
A medium conveying apparatus includes a pair of conveyance rollers including a first roller and a second roller facing the first roller on an upward side of the first roller, to convey a medium between the first roller and the second roller, and a pair of guides including a lower guide located on an upstream side of the pair of conveyance rollers in a medium conveying direction and an upper guide facing the lower guide, to guide the medium to the pair of conveyance rollers. The upper guide is movably located upwardly according to a conveyance of the medium and the lower guide is movably located downwardly according to the conveyance of the medium so that a space between the pair of guides is changed according to the medium.