Scanner Housing Positioning via Hinge Engagement
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Solution Overview
Problem
Image reading devices face issues with skewed document orientation during scanning, leading to tilted document images relative to the background, which existing positioning mechanisms struggle to accurately address.
Innovation Solution
The image reading device incorporates a document conveyance device with a pair of hinge mechanisms and positioning projections that engage with recesses on the scanner housing, allowing precise adjustment and alignment of the document conveyance device in a plane along the glass plate, preventing skew and ensuring accurate image reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a positioning mechanism is added to adjust the document conveyance device position, then image reading accuracy is improved, but device complexity increases
Solution Approach 1:
The hinge mechanism itself provides the positioning function through its structural design. The first hinge mechanism includes a positioning projection that engages with a positioning recess in the scanner housing, allowing the document conveyance device to self-position accurately without requiring additional active positioning mechanisms. This transforms the hinge from a simple connection element into a self-positioning component.
Solution Approach 2:
The positioning function is merged with the hinge mechanism. Instead of having separate positioning and hinging functions, the patent integrates the positioning capability directly into the hinge structure through the positioning projection and recess arrangement, reducing overall system complexity while maintaining positioning accuracy.
2Measurement precision
If the document conveyance device is made adjustable in position, then image reading accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The positioning is achieved through simple geometric features (projections and recesses) that can be easily manufactured using standard molding or machining processes. These positioning elements are integrated into existing components rather than requiring separate expensive positioning mechanisms, significantly reducing manufacturing costs while maintaining accuracy.
Solution Approach 2:
The design allows for easy adjustment of positioning parameters by modifying the geometry of the positioning projection and recess. This enables flexible positioning adjustment without requiring complex mechanisms or expensive components, making the system both accurate and cost-effective to manufacture.
3Manufacturing precision
If positioning projections and recesses are used for alignment, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The positioning projection and recess are integrated into the hinge mechanism structure itself. The positioning projection is formed as part of the hinge arm, and the positioning recess is formed in the scanner housing, combining the positioning function with the existing structural elements rather than adding separate positioning components.
Solution Approach 2:
The positioning projection and recess automatically align the document conveyance device with the scanner housing when the hinge is assembled. This self-aligning feature eliminates the need for additional alignment mechanisms or complex adjustment procedures, achieving high positioning precision through the inherent geometry of the connected components.
Data Source
AI summary
An image reading device includes a scanner housing, a pair of hinge mechanisms, and a document conveyance device. The scanner housing includes an engaged portion for positioning provided at a portion of a top surface of the scanner housing located outside of an original glass plate mounted in the top surface of the scanner housing. The document conveyance device includes an engaging portion for positioning engageable with the engaged portion when in the closed position, and is positioned in a plane along a top surface of the original glass plate by engagement of the engaging portion with the engaged portion. In positioning the document conveyance device, the document conveyance device is fixed to the pair of hinge mechanisms to allow the document conveyance device to be adjusted in position in the plane.