Presser Sheet Winding Mechanism for Thick Document Handling
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Solution Overview
Problem
Conventional image processing apparatuses face difficulties in handling thick documents, as the platen cover cannot be closed properly, leading to issues with image reading in both conveyance and placement modes, requiring cumbersome user operations and potential noise from external light entering through gaps.
Innovation Solution
The apparatus incorporates a presser sheet with a sheet winding portion and a retreat space, allowing the presser sheet to extend and press thick documents, ensuring the platen cover can be closed, and a document pressing portion with panel portions that displace into a retreat space to prevent lift and minimize light entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the platen cover is closed to cover the document table, then external light entry is prevented, but thick documents cannot be properly pressed and read
Solution Approach 1:
The presser sheet is designed as a flexible, movable component that can dynamically adjust its position and contact pressure. It extends from the sheet winding portion to contact and press thick documents, then retreats into the retreat space when not needed, allowing the platen cover to close completely and prevent external light entry while maintaining the ability to handle documents of varying thicknesses
Solution Approach 2:
The presser sheet is stored in a nested configuration within the sheet winding portion when not in use, and the retreat space is nested within the platen cover structure. This nesting allows the presser sheet to be available when needed without permanently occupying space that would prevent the platen cover from closing tightly, thus preventing external light entry while maintaining document pressing capability
2Ease of operation
If the platen cover is kept open to accommodate thick documents, then document pressing is improved, but external light enters causing noise
Solution Approach 1:
The presser sheet acts as an intermediary mechanism between the platen cover and the document. It provides the necessary pressing force for thick documents while allowing the platen cover to close completely, thus mediating between the conflicting requirements of document pressing and external light prevention
3Adaptability or versatility
If slide rails are used to lift the hinge portion, then book document holding is improved, but device complexity increases
Solution Approach 1:
The pressing function is extracted from the platen cover structure itself and implemented through a separate, simpler presser sheet mechanism. This eliminates the need for complex slide rails and hinge portion lifting mechanisms, reducing device complexity while maintaining the ability to handle thick book documents
Data Source
AI summary
An image processing apparatus includes a document table, an image reading portion, a cover portion, a presser sheet, and a sheet winding portion. The presser sheet is provided on the cover portion, and contacts the document on the document table when the cover portion is positioned at the closing position. The sheet winding portion allows a first portion of the presser sheet to extend along the document table while holding a second portion of the presser sheet in a wound state. The sheet winding portion can feed the second portion when an external force is applied to the first portion. In the cover portion, a retreat space is formed so that the first portion of the presser sheet and a portion of the second portion fed from the sheet winding portion can retreat into the retreat space.