Dynamic Separation Roller Speed for Auto Document Feeder Folding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Auto document feeders (ADF) face the issue of leading end folding when feeding a large number of documents, where the initial sheets are bent due to inadequate separation, and existing solutions either increase the apparatus size or decrease the feeding speed to prevent this.
Innovation Solution
A sheet feeding apparatus with a separation roller and a friction member that controls the rotation speed, initially rotating at a slower speed to separate the first sheet and then increasing speed after a predetermined number of sheets or time have been fed, reducing the abutting force and preventing leading end folding without enlarging the apparatus or slowing the feed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the separation roller rotates at a high speed to maintain feeding efficiency, then the feeding speed is improved, but the abutting force increases causing leading end folding of the first sheet
Solution Approach 1:
The separation roller's rotation speed is made dynamic rather than constant. The controller adjusts the rotation speed based on the feeding stage: using a lower first rotation speed when separating the first sheet to prevent leading end folding, and switching to a higher second rotation speed for subsequent sheets to maintain feeding efficiency. This dynamic speed adjustment resolves the contradiction between preventing damage and maintaining productivity.
Solution Approach 2:
The rotation speed parameter of the separation roller is changed according to the feeding sequence. The system transitions from a first rotation speed (lower) for the initial sheet separation to a second rotation speed (higher) for subsequent sheets. This parameter change allows the system to optimize performance for each stage of the feeding process, preventing leading end folding while maintaining overall feeding speed.
2Object-affected harmful factors
If the separation roller rotates at a slow speed to prevent leading end folding, then the harmful effect is reduced, but the overall feeding speed decreases
Solution Approach 1:
The system uses dynamic speed adjustment where the separation roller operates at a lower first rotation speed only during the critical initial sheet separation to prevent leading end folding, then switches to a higher second rotation speed for the remaining sheets. This dynamic approach ensures that the slow speed is applied only when necessary, minimizing its impact on overall feeding productivity.
Solution Approach 2:
The rotation speed is periodically changed based on the feeding sequence. The controller implements a periodic pattern where the first rotation speed is used for the initial sheet separation phase, and then transitions to the second rotation speed for subsequent sheets. This periodic action allows the system to balance damage prevention with maintaining high feeding speed for the majority of the feeding process.
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
Prevents leading end folding by reducing the abutting force on the first document while maintaining high feeding speed and stack capacity, ensuring efficient and reliable document feeding.
Implementation Method 1
a separation roller which rotates and applies a feeding force to a sheet of stacked sheets
Implementation Method 2
a friction member which opposes the separation roller and which applies friction against the feeding force
Data Source
AI summary
A sheet feeding apparatus for separating and feeding stacked sheets one by one, includes a separation roller which rotates and applies a feeding force to a sheet of stacked sheets, a friction member which opposes the separation roller and which applies friction against the feeding force, and a rotation speed controller which controls a rotation speed of the separation roller. The rotation speed of the separation roller varies between a first speed and a second speed. The separation roller rotates at the first speed when separating a first one of the stacked sheets. The separation roller rotates at the second speed when separating sheets after separating a predetermined number of the stacked sheets. The first speed is slower than the second speed.