Conveyance Passage Segmentation for Document Feeding Reliability
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Solution Overview
Problem
Existing image-reading apparatuses suffer from insufficient mechanical strength in their conveyance passages, leading to conveyance failures, such as oblique feeding of documents, due to the reliance on swingable members for forming the passage.
Innovation Solution
The introduction of a second conveyance passage with a conveyance-passage forming member that includes an opening, allowing partial access and enhancing mechanical strength, and a lid that opens and closes this opening to facilitate document conveyance and removal of residual substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a swingable member is used to form the conveyance passage, then the apparatus can be compact and accessible, but the mechanical strength is insufficient causing conveyance failures
Solution Approach 1:
The conveyance passage is segmented into multiple sections: a fixed first conveyance passage and a movable second conveyance passage. The swingable member forms only the second conveyance passage, allowing access while the first passage provides structural strength. This segmentation resolves the contradiction by distributing functions across different structural zones.
Solution Approach 2:
Different parts of the conveyance passage have different structural properties. The first conveyance passage is fixed and provides mechanical strength, while the second conveyance passage is swingable and provides accessibility. This local differentiation of structural quality allows each section to optimize for its specific function.
2Strength
If the conveyance passage is fully enclosed, then mechanical strength is improved, but residual paper and substances cannot be easily removed
Solution Approach 1:
The second conveyance passage is designed to be dynamically movable (swingable) rather than statically fixed. This allows the passage to be closed during operation for strength and openness during maintenance for accessibility. The dynamic capability enables the system to adapt its structural state based on operational requirements.
Solution Approach 2:
The swingable member is pre-positioned to allow access to the second conveyance passage before maintenance is needed. This preliminary configuration enables easy removal of residual substances without requiring disassembly of the entire apparatus, resolving the contradiction between enclosed strength and maintainability.
3Ease of operation
If the swingable member is positioned at the open position, then access to the conveyance passage is allowed, but the mechanical strength is reduced
Solution Approach 1:
The conveyance function is segmented between two passages: the first fixed passage provides reliable structural support, while the second swingable passage provides accessibility. Documents are conveyed through the fixed first passage for reliability, and the swingable second passage remains available for maintenance access without compromising conveyance reliability.
Solution Approach 2:
The first fixed conveyance passage acts as an intermediary that provides a stable, reliable path for document conveyance while the swingable second passage provides maintenance access. The fixed passage mediates between the need for reliability and the need for accessibility, ensuring conveyance reliability is maintained even when the swingable member is open.
Data Source
AI summary
An image-forming apparatus includes an image-reading unit. The image-reading unit includes a first member and a second member. The image-reading unit includes an original-document-feeding apparatus that conveys an original document from an original-document-loading tray to a discharge tray via a read position. In the first member and the second member, a first conveyance passage along which the original document is conveyed to the read position and a second conveyance passage along which the original document is conveyed from the read position to the discharge tray are formed. The second member includes at least two conveyance rollers. Between the two conveyance rollers, there are opening edges for partly allowing access to the second conveyance passage. The second member includes a lid for covering an opening that is defined by the opening edges.