Image Reading Device with Movable Cursor for Legal-Size Documents
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Solution Overview
Problem
Existing image reading devices are limited by immovable reference plates, restricting document size to A4 dimensions in the sheet fixing system, making it impossible to read legal size documents.
Innovation Solution
The image reading device incorporates a movable reading unit and a reciprocating cursor mechanism, allowing the reading unit to move in the sub-scanning direction and the cursor to adjust its position, thereby increasing the readable range to accommodate larger documents like legal size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed reference plate is used to position documents, then the positioning accuracy is maintained, but the readable document size is limited to A4 dimensions
Solution Approach 1:
The reference plate is transformed from a fixed structure to a movable one. The movable reference plate can shift along the sub-scanning direction to accommodate different document sizes, enabling both A4 and legal size documents to be properly positioned and read without changing the overall device structure.
Solution Approach 2:
The reference plate mechanism is divided into movable and stationary components. The movable reference plate can independently adjust its position while the reading unit remains fixed, allowing flexible adaptation to different document formats without complicating the entire reading system.
2Adaptability or versatility
If the reading unit moves in the sub-scanning direction to increase readable range, then larger documents can be read, but the reading precision may be affected
Solution Approach 1:
The reading unit is designed to move along the sub-scanning direction while maintaining its reading precision. By combining the movable reference plate with the movable reading unit, the system can accommodate larger documents without sacrificing reading accuracy, as both components are designed to work together in a coordinated manner.
3Adaptability or versatility
If the cursor is made movable to accommodate larger documents, then the positioning flexibility is improved, but the mechanical complexity increases
Solution Approach 1:
The cursor is transformed from a fixed indicator to a movable one that can adjust its position along the sub-scanning direction. This allows the cursor to maintain accurate positioning indicators for different document sizes, providing visual feedback to users while accommodating larger document formats.
Solution Approach 2:
The movable cursor mechanism is integrated with the movable reference plate system, so that both components move together in a coordinated manner. This reduces the overall mechanical complexity by sharing the movement mechanism rather than adding separate independent systems.
Data Source
AI summary
An image reading device includes a document table, an image reading unit, a reading unit moving part, a cursor, and a cursor moving part. The reading unit is disposed below the document table, and scans the placed document in a main-scanning direction to read an image. The reading unit moving part moves the reading unit in a sub-scanning direction crossing the main-scanning direction and in an opposite direction. To the cursor, a reading start side edge of the document placed on the document table in the sub-scanning direction is abutted. The cursor moving part moves the cursor along the sub-scanning direction in a reciprocating manner. The cursor moving part moves the cursor from a reference position of the reading unit in the opposite direction in conjunction with a movement of the reading unit from the home position in the opposite direction.