Full-Width Transmitting Roller Document Feeding Structure
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Solution Overview
Problem
Conventional document feeding structures in portable scanners often experience misfeeding due to gaps between rollers, limiting document size and placement flexibility, and increasing production costs when attempting to address these issues.
Innovation Solution
A document feeding structure featuring a full-width transmitting roller and a bendable pressing plate with a damping unit, where the pressing plate is secured to the scanning unit and designed to cover the entire feeding path, eliminating gaps and ensuring consistent feeding force through deformation and notch/opening configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guiding plate is arranged on the upstream of the feed roller to limit document position, then misfeeding is avoided, but document placement flexibility is reduced
Solution Approach 1:
The invention removes the guiding plate component from the document feeding structure. Instead of using a rigid guiding plate to limit document position, the patent employs a full-width transmitting roller that covers the entire feeding path, eliminating the need for position-limiting guides while maintaining feeding reliability through the roller's width and pressing mechanism.
2Reliability
If the width of feed roller and idle roller is enlarged to cover the whole feeding path, then misfeeding is eliminated, but scanner volume and production cost increase
Solution Approach 1:
The invention merges the functions of the feed roller and idle roller into a single full-width transmitting roller. This consolidation eliminates the gap between separate rollers while maintaining feeding reliability, and reduces the overall structure size compared to having two wide rollers, thereby avoiding increased scanner volume.
3Adaptability or versatility
If a full-width transmitting roller is used to cover the whole feeding path, then document placement flexibility is improved, but device complexity increases
Solution Approach 1:
The invention employs a pressing plate with an extending portion that acts as a flexible element to apply pressure on the document. This flexible pressing mechanism, combined with the full-width transmitting roller, allows documents of various sizes and positions to be fed reliably without requiring complex rigid structural components, thus maintaining 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
Enables flexible document placement and size compatibility without increasing scanner volume or production costs, ensuring reliable document feeding by eliminating misfeeding issues and reducing vibration and torque resistance.
Implementation Method 1
a damping unit is arranged between said pressing plate and said scanning unit
Implementation Method 2
said idle roller 41 applies a normal force to the document to ensure the friction between the document and said feed roller 40 is big enough to avoid the document slipped with said feed roller 40
Data Source
AI summary
The present invention relates to a document feeding structure including a feeding path; a scanning unit, said scanning unit being arranged on one side of said feeding path to scan documents passing through said feeding path; a transmitting roller, said transmitting roller arranged opposite to said scanning unit and covering the whole feeding path; and a pressing plate, said pressing plate including a fixed end, a free end disposed in said feeding path to contact with said transmitting roller and an extending portion connecting said free end and said fixed end, wherein said pressing plate covering the whole feeding path.