Movable Guide Rib Mechanism for Scanner Original Flapping
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Solution Overview
Problem
Conventional image reading apparatuses experience reduced reading accuracy and increased friction noise due to the constant pressing of the original by flexible sheet members, which can lead to load fluctuations and original flapping, causing noise and accuracy issues.
Innovation Solution
An image reading apparatus with a movable guide portion featuring rib portions that project toward the supporting surface, applying a biasing force to guide and press the original, while a pressing member moves between pressing and separation positions to prevent flapping and reduce friction noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a flexible sheet member is provided to press the original to prevent floating, then reading accuracy is improved, but friction noise increases
Solution Approach 1:
The pressing function is segmented from the guiding function. The guide portion has rib portions that provide localized pressing only at specific contact points rather than continuous surface contact, reducing the overall contact area and friction noise while maintaining sufficient pressing force to prevent original floating
Solution Approach 2:
The rib portions create localized pressing zones with high contact pressure at discrete points rather than distributed pressure across a large surface. This local quality approach maintains effective original contact at the reading position while minimizing the total contact area that generates friction noise
2Measurement precision
If pressing force is increased to improve reading accuracy, then contact between original and supporting surface is improved, but load fluctuation occurs when original rear end passes over
Solution Approach 1:
The guide portion is made movable rather than fixed, allowing it to dynamically adapt its position and pressing force as the original passes through. This dynamic adjustment prevents sudden load changes when the original rear end passes over, maintaining load stability while preserving reading accuracy
Solution Approach 2:
The pressing action is applied periodically rather than continuously, with the movable guide portion engaging and disengaging in a controlled manner as the original passes through. This periodic action avoids the load fluctuation that occurs with constant pressing when the original rear end passes over
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
The solution enhances reading accuracy and reduces noise by stabilizing the original during the reading process without increasing the pressing force, minimizing contact area and thus friction noise, and preventing load fluctuations.
Implementation Method 1
a biasing member configured to apply a biasing force to the guide portion toward the supporting surface
Data Source
AI summary
An image reading apparatus has a reading portion configured to read the image of the original at the reading position located on a supporting surface for supporting the original, an original feeding portion configured to convey an original to the reading position, a movable guide portion which faces the supporting surface and guides the original conveyed by the original conveying portion to the reading position, and a biasing member configured to apply a biasing force to the guide portion toward the supporting surface, wherein the movable guide portion has a rib portion, the rib portion projects toward the supporting surface and is formed along the original conveying direction, and the rib portion presses an original, that is read by the reading portion while the original is conveyed by the conveying portion, to the supporting surface by the biasing force of the biasing member.