Image Reading Apparatus Conveyance Guide for Sheet Bending
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Solution Overview
Problem
Image reading apparatuses often bend sheets during the image reading process due to varying bending stresses caused by different sheet thicknesses, which can lead to instability and image quality issues, especially with thicker papers.
Innovation Solution
The apparatus employs a frame, conveying rollers, a reading section, first and second guide members, a supporting section, and a locking mechanism to adjust bending stress by holding the sheet convexly centered, using a pressing roller and urging member to maintain stability and reduce bending stress across the reading position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the image reading apparatus bends the sheet along the conveying path, then the sheet can be conveyed through the reading position, but the bending stress varies according to sheet thickness causing instability and image quality issues
Solution Approach 1:
The patent applies the dynamics principle by making the supporting section rotatable around a turning axis, allowing the apparatus to dynamically adjust its configuration based on sheet thickness. The locking section can lock the supporting section at different angles to accommodate varying bending stresses while maintaining stable image reading across different paper types
Solution Approach 2:
The patent applies parameter changes by adjusting the angle of the supporting section through rotation and locking mechanisms. This allows the apparatus to change the geometric parameters of the conveying path to match different sheet thicknesses, thereby maintaining optimal bending stress and image reading stability across various paper types
2Device complexity
If the apparatus uses a fixed supporting section, then the structure is simple, but it cannot accommodate varying sheet thicknesses and bending stresses
Solution Approach 1:
The supporting section is designed to be rotatable around a turning axis rather than fixed, enabling it to adapt to different sheet thicknesses. The locking section provides a mechanism to lock the supporting section at predetermined angles, combining structural simplicity with adaptability through a single rotational degree of freedom
Solution Approach 2:
The apparatus is segmented into functional components including the supporting section, locking section, and conveying rollers. This segmentation allows each component to be optimized independently, with the supporting section providing adaptability through rotation while maintaining overall structural simplicity
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 configuration allows for consistent image reading across varying sheet thicknesses, minimizing bending stress and ensuring stable conveyance and image quality, particularly for both thin and thick papers, by adjusting the position and action of the guide members and rollers.
Implementation Method 1
rotating in a first direction from the first guide member toward the second guide member around the first turning axis with gravity acting on the reading section, the first guide member, and the locking section
Data Source
AI summary
An image reading apparatus includes a frame, a conveying roller, a reading section, a first guide member, a second guide member, a supporting section, and a locking section. The conveying roller conveys a sheet along a conveying path. The reading section is supported rotatably around a first turning axis. The reading section reads an image on the sheet in a reading position in the conveying path. The first guide member is provided in the reading section. The second guide member is provided in a position opposed to the first guide member across the conveying path. A first end portion of the supporting section is supported to be rotatable around a second turning axis. The locking section is locked to a portion between the first end portion and a second end portion in the supporting section. The locking section rotates in a first direction around the first turning axis.