Paper Feeding Device Separation Roller Guide Surface Friction
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Solution Overview
Problem
The existing paper feeding devices face challenges in reducing sliding resistance in the sliding portion that supports the separation roller, leading to incomplete pressing against the paper feeding roller and inefficient sheet separation.
Innovation Solution
The paper feeding device incorporates a torque limiter to support the separation roller, a pressure unit to press the separation roller against the paper feeding roller, and rotation stopping portions with sliding surfaces and guide surfaces to reduce sliding resistance, ensuring effective sheet separation and conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separation roller is slidably supported in a state of being pressed against the paper feeding roller, then the sheet separation function is achieved, but the sliding resistance becomes large causing incomplete pressing
Solution Approach 1:
The patent converts the static sliding support into a dynamic rolling support by introducing a rotation stopping portion with sliding surfaces that enable the separation roller to rotate along the guide surfaces. This dynamic rolling motion reduces sliding resistance while maintaining pressing contact, resolving the contradiction between reliable sheet separation and sufficient pressing force.
Solution Approach 2:
The patent introduces rotation stopping portions with sliding surfaces as an intermediary element between the separation roller and the holder. This intermediary component reduces direct sliding contact by providing guided rolling motion, thereby reducing sliding resistance while maintaining the pressing function.
2Productivity
If the sliding resistance is reduced to improve pressing completeness, then the sheet separation efficiency improves, but the device complexity increases
Solution Approach 1:
The rotation stopping portion serves multiple functions simultaneously: it supports the separation roller, provides guided rolling motion to reduce sliding resistance, and maintains pressing contact. This multi-functionality reduces the need for additional components, improving sheet separation efficiency without significantly increasing device complexity.
Solution Approach 2:
The patent changes the friction parameter by transforming sliding contact into rolling contact through the rotation stopping portion. This parameter change reduces sliding resistance and improves sheet separation efficiency while maintaining a relatively simple structure through the integrated design of the rotation stopping portion.
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 reduces the sliding resistance between the rotation stopping portions and the guide surfaces, enhancing the sliding efficiency and maintaining effective sheet separation, even with overlapped sheets, while maintaining a compact device size.
Implementation Method 1
The shaft is configured to rotatably support the separation roller via a torque limiter
Implementation Method 2
a pressure unit to press the separation roller against the paper feeding roller
Implementation Method 3
The rotation stopping portion is configured to include a first sliding surface and a second sliding surface... reduces the sliding resistance between the rotation stopping portions and the guide surfaces
Data Source
AI summary
A paper feeding device includes a paper feeding roller and a separation roller. The paper feeding roller and the separation roller are arranged in a parallel direction. The paper feeding roller and the separation roller interpose a sheet. The paper feeding device includes a paper feeding roller, a separation roller, a shaft, a holder, and a rotation stopping portion. The paper feeding roller is configured to convey the sheet in a conveyance direction. The separation roller is configured to be pressed against the paper feeding roller. The shaft is configured to rotatably support the separation roller via a torque limiter. The holder is configured to include a supporting portion. The supporting portion is provided with a first guide surface and a second guide surface facing each other and extending in the parallel direction. The rotation stopping portion is configured to be attached to the shaft. The rotation stopping portion is configured to be inserted between the first guide surface and the second guide surface. The rotation stopping portion is configured to include a first sliding surface and a second sliding surface. The first sliding surface faces the first guide surface on the paper feeding roller side of the parallel direction and a downstream side of the conveyance direction with respect to a rotation axis of the separation roller. The second sliding surface faces the second guide surface on an opposite side of the paper feeding roller of the parallel direction and an upstream side of the conveyance direction with respect to the rotation axis of the separation roller.