Sheet Feeder Cassette Wall Geometry for Wireless Tag Alignment
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Solution Overview
Problem
Existing sheet feeders in image forming apparatuses often experience feeding failures due to the interference of wireless tags on sheets, particularly when the tags are positioned off-center, leading to misalignment and jamming.
Innovation Solution
The sheet feeder design includes a cassette with a front wall and side guides that accommodate wireless tags by varying the height of the cassette front wall and conveyance guide to match the tag's position, ensuring the sheet is aligned and fed smoothly, reducing collisions with the cassette front wall and conveyance guide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sheet container space is designed with uniform height walls, then the structure is simple and easy to manufacture, but sheets with off-center wireless tags experience feeding failures due to misalignment and collision with the front wall
Solution Approach 1:
The cassette front wall is designed with non-uniform height, creating a locally elevated portion in the center region. This local quality change allows the wall to accommodate wireless tags positioned off-center on sheets, preventing collision and feeding failures without requiring complete structural redesign of the entire cassette.
Solution Approach 2:
The conveyance guide is designed with a bent portion that dynamically adjusts the sheet's path based on its position. When a sheet with an off-center wireless tag enters, the bent portion redirects the sheet to avoid collision with the front wall, enabling the system to adapt to varying sheet-tag configurations during operation.
2Reliability
If the cassette front wall height is increased to accommodate all sheet positions, then feeding failures are suppressed, but the device complexity and space occupation increase
Solution Approach 1:
Instead of uniformly increasing the entire front wall height, the design applies increased height only to the central portion where wireless tags are most likely to be positioned. This localized approach provides the necessary accommodation for off-center tags while minimizing the overall volume increase of the cassette structure.
3Reliability
If the conveyance guide is made with a bent portion to redirect sheets, then sheet alignment is improved and collisions are reduced, but the device complexity increases
Solution Approach 1:
The conveyance guide incorporates a bent portion with a curved configuration that smoothly redirects sheets. This curved design allows for gradual direction change, improving sheet alignment and reducing sharp turns that could cause jamming, while the bent structure integrates seamlessly into the existing guide assembly.
Data Source
AI summary
A sheet feeder includes a cassette has a sheet container space configured to hold a sheet having a wireless tag. The cassette feeds the sheet to a first side in a first direction. A horizontal direction orthogonal to the first direction is a second direction. A range in the second direction occupied by the wireless tag of the sheet held in the sheet container space is a first range. A range in the second direction including at least a part of the first range is a second range. A range in the second direction occupied by the sheet container space is a third range. In the cassette front wall, a height in a vertical direction in the third range except the second range is smaller than a height in the vertical direction in the second range.