Sheet Feeding Device Shifting Roller to Guide Surface
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Solution Overview
Problem
Conventional sheet feeding devices often pick up multiple sheets due to friction and static cling, leading to inconsistent separation of sheets based on material and quality, which can result in improper feeding in image forming apparatuses.
Innovation Solution
A sheet feeding device with a feed roller and a guide member that shifts the roller towards a guide surface before rotation, ensuring the topmost sheet is distinctly separated and fed into the path, using a combination of a feed roller, a guide member, and a shifting unit to prevent multiple sheets from being fed simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a feed roller is used to pick up sheets from a stack, then sheets can be fed into the sheet feeding path, but multiple sheets may be picked up due to friction and static cling between sheets
Solution Approach 1:
The feed roller is shifted toward the guide surface before rotation begins, positioning the topmost sheet against the guide surface in advance. This preliminary positioning prevents multiple sheets from being picked up by establishing proper contact geometry before the feeding action starts.
Solution Approach 2:
The guide surface acts as an intermediary between the feed roller and the sheet stack. By shifting the feed roller toward the guide surface, the topmost sheet is mediated through the guide surface, which helps separate it from the underlying sheets and prevents static cling from causing multiple sheet pickup.
2Ease of operation
If the feed roller is angled toward the side guide, then the sheet is urged to the side guide and fed in correct posture, but sheets may not always be separated steadily depending on materials and conditions
Solution Approach 1:
The feed roller's position is dynamically adjusted by shifting it toward the guide surface before rotation. This dynamic positioning adapts to different sheet materials and conditions, ensuring reliable separation by establishing optimal contact geometry rather than relying on fixed angular positioning alone.
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 configuration effectively separates the topmost sheet from the stack, ensuring it is fed correctly into the image forming path, preventing multiple sheets from being fed together and improving the reliability of the sheet feeding process.
Implementation Method 1
more than one recording sheets may be picked up by the feed roller due to friction and static clings caused in between the sheets
Implementation Method 2
a shifting unit to shift the feed roller in a direction toward the guide surface before the feed roller is rotated
Data Source
AI summary
A sheet feeding device to feed a sheet in a sheet stack into a sheet feeding path is provided. the sheet feeding device includes a feed roller configured to contact the sheet stack and feed the sheet in a feeding direction, a guide member, having a guide surface, which is configured to contact a side of the sheet fed by the feeding roller, to guide the sheet being fed along a guiding direction, and a shifting unit to shift the feed roller in a direction toward the guide surface before the feed roller is rotated.