Medium Feeding Apparatus with Dynamic Separation Roller Control
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Solution Overview
Problem
Existing medium feeding apparatuses in printers and scanners face challenges in separating documents with strong adhesion, leading to multi-feeding issues and impaired usability, as they often require stopping the feeding process to prevent multi-fed documents from reaching the reading area.
Innovation Solution
A medium feeding apparatus with a control system that includes detection sections and a separation roller, allowing for two feeding modes: one that uses detection information to manage the separation and feeding of documents, and another that does not, enabling longer separation periods and improved usability by adjusting the rotation speed and torque of the separation roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feeding process is stopped to prevent multi-fed documents from reaching the reading area, then multi-feeding is prevented, but productivity deteriorates
Solution Approach 1:
The patent replaces the mechanical stopping of the feeding process with a detection and control system that uses sensors (first detection section and second detection section) to monitor document passage and automatically adjusts separation roller torque and rotation speed to prevent multi-feeding while maintaining continuous operation
Solution Approach 2:
The patent implements a feedback control system where detection sections monitor document passage and provide information to the control section, which then adjusts separation roller parameters (torque and rotation speed) in real-time to maintain reliable separation without stopping the feeding process
2Reliability
If the separation roller continuously performs separation to prevent multi-fed documents, then separation reliability is improved, but device complexity increases
Solution Approach 1:
The patent makes the separation roller's rotation speed and torque dynamic rather than fixed, allowing the control section to adjust these parameters based on real-time detection information from the detection sections, enabling adaptive separation that responds to varying document conditions
3Productivity
If the feeding roller rotates faster to improve throughput, then productivity is improved, but separation accuracy deteriorates
Solution Approach 1:
The patent changes the parameters of the separation roller (rotation speed and torque) based on detection information, allowing the system to maintain high feeding speeds while adjusting separation parameters to ensure accurate document separation under varying operating conditions
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 apparatus effectively separates documents with strong adhesion and improves throughput by allowing continuous feeding even in multi-feeding states, enhancing the overall usability and separation performance.
Implementation Method 1
a separation roller that nips the medium with the feeding roller to promote separation of the medium
Implementation Method 2
Some documents have strong adhesion between the documents and are difficult to separate
Data Source
AI summary
A medium feeding apparatus capable of switching between a first feeding mode and a second feeding mode, in which in the first feeding mode, when a first detection section positioned downstream of a feeding roller in a medium feeding direction detects passage of a trailing end of a preceding medium in a feeding standby state in which driving of the feeding roller that feeds the medium is stopped, starting the driving of the feeding roller to perform feeding of a succeeding medium, and in the second feeding mode, when a second detection section positioned downstream of the first detection section in the medium feeding direction detects the passage of the trailing end of the preceding medium in the feeding standby state, starting the driving of the feeding roller to perform the feeding of the succeeding medium.