Sheet Feeding Roller Alignment for Wear Reduction
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Solution Overview
Problem
In sheet feeding devices, misalignment of the separation nip and conveyance nip leads to uneven friction forces, causing roller wear and potential conveyance failures such as non-sheet feeding or multiple sheet feeding, especially with poor-quality sheets, resulting in shortened roller life.
Innovation Solution
The sheet feeding device is designed with the first contact point, second contact point, and third contact point aligned on a linear line in the conveyance direction, ensuring the pickup roller, feed roller, and conveyance rollers operate with balanced friction forces, reducing wear and improving sheet handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conveyance path curves at approximately right angles to the conveyance direction, then the layout flexibility is improved, but the separation nip and conveyance nip become misaligned, causing roller wear and conveyance failures
Solution Approach 1:
The patent introduces a new spatial dimension by extending the conveyance path in a direction substantially perpendicular to the sheet feeding direction. This allows the conveyance path to curve at approximately right angles while maintaining proper alignment of the separation nip and conveyance nip through three-dimensional path design, thereby achieving layout flexibility without compromising conveyance reliability
2Productivity
If the feed roller or retard roller is applied with load from the sheet at misaligned nips, then the sheet can be conveyed, but the rollers wear due to friction, shortening their life
Solution Approach 1:
The patent aligns the separation nip and conveyance nip on the same linear line, creating an equipotential condition where the sheet passes through both nips without lateral deviation. This eliminates uneven friction forces and excessive loads on the feed roller and retard roller, enabling continuous sheet conveyance without roller wear, thus extending roller life while maintaining productivity
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
This alignment and pressure management system minimizes roller wear, prevents conveyance failures, and extends the life of the rollers, ensuring reliable and efficient sheet feeding across various sheet qualities.
Implementation Method 1
The pickup roller contacts a sheet at a first contact point P1 in a pickup position and rotates to convey the sheet in a predetermined conveyance direction
Implementation Method 2
At the separation nip, the sheet is separated based on a difference of friction force between the feed roller and the sheet and friction force between the retard roller and the sheet
Implementation Method 3
The conveyance rollers pair contacts each other at a third contact point P3 and conveys the sheet passing through the second contact point P2 to a conveyance path
Data Source
AI summary
A sheet feeding device includes a pickup roller, a feed roller, a retard roller, a conveyance rollers pair. The pickup roller contacts a sheet at a first contact point in a pickup position and rotates to convey the sheet in a predetermined conveyance direction. The feed roller is disposed on a downstream side of the pickup roller in the conveyance direction. The retard roller contacts the feed roller at a second contact point and conveys the sheet while separating the sheet. The conveyance rollers pair contacts each other at a third contact point and conveys the sheet passing through the second contact point to a conveyance path. The first contact point, the second contact point and the third contact point are disposed on a linear line in the conveyance direction, when viewed from axial directions of the rollers.