Paper Feed Roller Separating Pad Dynamics for Double Feed Prevention
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Solution Overview
Problem
Conventional paper feed units in image forming apparatuses, such as facsimile machines and printers, experience double feeding issues when a large number of sheets of paper are forwarded, leading to unseparated sheets being fed simultaneously due to excessive frictional forces and improper alignment, causing the separating pad to be parted from the paper feed roller.
Innovation Solution
A paper feed unit design featuring a separating pad with elastic deformation capabilities, supported by a holder with a recessed portion and a second holder member that allows the pad to recede and absorb the load of multiple sheets, preventing separation from the paper feed roller, thus ensuring each sheet is separated and fed individually.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large number of sheets of paper are forwarded by the paper feed roller, then the productivity increases, but the sheets of paper may rush to the separating pad and cause the holder to swing, resulting in the separating pad being parted from the paper feed roller and causing double feed
Solution Approach 1:
The holder is designed to be swingable about a fulcrum, allowing it to dynamically adjust its position in response to load variations. When multiple sheets rush to the separating pad, the holder can swing to accommodate the increased load without causing the separating pad to detach from the paper feed roller, thus preventing double feed while maintaining high productivity
Solution Approach 2:
The coil spring provides elastic deformation capability to the holder, allowing it to change its mechanical properties under load. The spring enables the holder to flexibly absorb sudden increases in paper load through elastic deformation, maintaining reliable paper separation even when processing large numbers of sheets continuously
2Reliability
If the separating pad is pressed firmly against the paper feed roller to ensure separation, then the separation reliability improves, but when multiple sheets rush to the pad, the holder may swing away causing the pad to separate from the roller
Solution Approach 1:
The holder's swingable design allows it to dynamically respond to excessive load by rotating about the fulcrum. This dynamic capability enables the holder to maintain the separating pad's contact with the paper feed roller even when multiple sheets simultaneously press against the pad, preventing both double feed and holder failure
Solution Approach 2:
The coil spring positioned between the holder and the paper feed roller provides beforehand cushioning. When multiple sheets rush to the separating pad, the spring absorbs the excessive force through elastic deformation, cushioning the holder against sudden swings and maintaining stable contact between the separating pad and roller
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 effectively prevents double feeding by maintaining contact between the separating pad and the paper feed roller, even under high loads, ensuring reliable single-sheet feeding and enhancing the stability and efficiency of the paper separation process.
Implementation Method 1
a separating pad with elastic deformation capabilities, supported by a holder with a recessed portion and a second holder member that allows the pad to recede and absorb the load of multiple sheets
Implementation Method 2
separates a sheet of paper from a plurality of sheets of paper stacked in a paper tray using friction provided by a paper feed roller and a separating pad
Data Source
AI summary
A paper feed unit, which is provided with a paper feed roller disposed such that an outer circumferential surface thereof contacts stacked sheets of paper so as to feed each sheet of paper by rotating, a separating pad having elasticity configured to press a sheet of paper being forwarded by the paper feed roller against the outer circumferential surface of the paper feed roller from a side of the sheet of paper opposite to the other side contacting the outer circumferential surface of the paper feed roller, a holder that supports the separating pad, and a biasing device that biases the holder so as to press the separating pad against the outer circumferential surface of the paper feed roller, for separating each sheet of paper from the stacked sheets by the rotation of the paper feed roller in cooperation with the separating pad and thus feeding the sheet of paper.