Rotating Background Section for Stable Document Reading
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Solution Overview
Problem
Existing image reading devices face instability in reading quality when handling documents of varying thicknesses due to a constant gap between the platen roller and the reading sensor, leading to potential document jams and damage to the background sections.
Innovation Solution
The image reading device incorporates a rotation member with separable background sections of different colors, which adjusts its position based on document thickness, and a guide member that separates from the transport path to accommodate varying document thicknesses, ensuring stable reading quality and preventing jams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant gap between the platen roller and reading sensor is maintained, then the device structure is simple, but the reading quality becomes unstable when handling documents of varying thicknesses
Solution Approach 1:
The background section is made rotatable relative to the reading sensor, allowing its position to be dynamically adjusted according to document thickness. The rotation amount is determined based on the thickness of the document being read, enabling the gap between the background section and reading sensor to vary dynamically while maintaining stable reading quality across different document types.
2Reliability
If the background section position is adjusted for thick documents, then reading quality is stabilized, but the device complexity increases
Solution Approach 1:
The background section is separated from the main platen roller structure, allowing it to be independently rotated and positioned. This segmentation enables the background section to be adjusted without affecting the overall platen roller structure, achieving reading quality stabilization with minimal additional complexity.
Solution Approach 2:
The rotation mechanism serves multiple functions: it adjusts the background section position for different document thicknesses, maintains optimal reading gaps, and prevents document jams. This multi-functionality reduces the need for separate adjustment mechanisms, thereby limiting the increase in device complexity.
3Device complexity
If the gap between platen roller and reading sensor is constant, then the device structure is simple, but document jams may occur with thick documents
Solution Approach 1:
The background section's rotatable design allows the gap between it and the reading sensor to dynamically adapt to document thickness. This dynamic adjustment prevents thick documents from jamming while maintaining simple structural implementation through the rotation mechanism.
4Device complexity
If the background section is fixed, then the device structure is simple, but the background section may be damaged by thick documents
Solution Approach 1:
The rotatable background section can dynamically adjust its position to accommodate thick documents, preventing them from contacting and damaging the background section. This dynamic protection mechanism is achieved through the rotation capability rather than complex protective structures.
Data Source
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AI summary
It includes a transport section configured to transport a document, a reading section configured to read an image of the document transported in a transport direction by the transport section, and a rotation member that is provided with, on a peripheral surface, at least two background sections having colors different in brightness from each other, that is provided at a position facing the reading section, and that, by rotating, changes a position of the background section with respect to a reading position of the reading section, wherein the rotation member is separable from the reading section.