Rotatable Adsorption Board for Document Positioning
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Solution Overview
Problem
Existing image reading and forming apparatuses face challenges in securely and efficiently positioning original documents for scanning, particularly in maintaining document alignment and preventing deviation during the opening and closing of the scanner cover.
Innovation Solution
The apparatus incorporates a rotatable adsorption board with an electrostatic adsorption surface, controlled by a lock mechanism and driven section, which clamps and absorbs the document between the adsorption surface and the document table glass, ensuring precise positioning and minimizing document movement during scanner operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pad is used to press the document, then document positioning is achieved, but document deviation occurs during scanner cover movement
Solution Approach 1:
The mechanical pad pressing system is replaced with an electrostatic adsorption system. The adsorption board generates electrostatic attraction force to hold the document against the document table glass, eliminating the mechanical pressing action that causes document deviation during scanner cover movement.
Solution Approach 2:
The document holding mechanism changes from mechanical contact pressure to electrostatic field interaction. By controlling the electrostatic adsorption parameters (charge density, field strength), the system achieves secure document positioning without the physical displacement caused by mechanical pressing.
2Reliability
If the scanner cover is made heavy for stability, then covering function is improved, but opening and closing operation becomes difficult
Solution Approach 1:
The manual mechanical operation of opening and closing the scanner cover is augmented with an electrostatic assistance system. The adsorption board uses electrostatic force to help hold and position the cover, reducing the manual effort required while maintaining stable covering when closed.
Solution Approach 2:
The electrostatic adsorption is activated periodically - engaged when the cover needs to be held stable (during scanning operation) and disengaged when opening/closing is required. This periodic activation provides stability when needed without interfering with operational ease.
3Manufacturing precision
If electrostatic adsorption is continuously applied, then document positioning is maintained, but energy consumption increases
Solution Approach 1:
The electrostatic adsorption is applied periodically rather than continuously. The adsorption board is activated only when document positioning is required (during scanning operation) and deactivated when the scanner cover is opened or the document is being loaded, significantly reducing energy consumption while maintaining positioning accuracy when needed.
Solution Approach 2:
The system uses the scanner cover's own closing action to trigger document positioning. When the cover is closed, it automatically activates the electrostatic adsorption to position the document, and when opened, it deactivates the adsorption, creating a self-regulating energy-efficient system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures accurate and stable document positioning, preventing deviation during scanner operations and allowing for easy attachment and alignment of documents of various sizes, while also optimizing energy use by controlling the adsorption process.
Implementation Method 1
The adsorption board, arranged in apart at a housing side at the time the cover member is positioned at the closed position, has an adsorption surface adsorbing the original document
Data Source
AI summary
An image reading apparatus comprises a housing having a document table glass, a scanner section, a cover member, an adsorption board, a driving section and a controller. The cover member is connected to the housing to be rotatable around a first rotation center line with respect to the housing between a closed position where the document table glass is covered and an open position. The adsorption board, arranged in a part at a housing side at the time the cover member is positioned at the closed position, has an adsorption surface adsorbing the original document, and is connected to the cover member to be rotatable around a second rotation center line parallel to the first rotation center line. The driving section adsorbs the original document on the adsorption surface of the adsorption board.