Paper Feed Apparatus Rotating Body for Sheet Separation
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Solution Overview
Problem
Conventional paper feed apparatuses face issues with separating overlapped image receiving media due to friction coefficients and surface states, leading to potential double feeding when media are conveyed to rollers.
Innovation Solution
A paper feed apparatus comprising a delivery section, a separation section, a rotating body, and a control device, where the rotating body is arranged upstream of the separation section and can contact and rotate to temporarily bend sheets, allowing air to enter between them, and the separation section includes a pair of rotating rollers and a fixed friction section to separate sheets effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed friction section is used to separate overlapped image receiving media, then the separation function is provided, but double feeding occurs when the coefficient of friction between media and surface state prevents effective separation
Solution Approach 1:
The rotating body performs preliminary action by temporarily bending the image receiving medium before it reaches the separation section. This preliminary bending creates separation between overlapped sheets, allowing the subsequent fixed friction section to effectively separate them without causing double feeding.
Solution Approach 2:
The rotating body acts as an intermediary element between the pickup roller and the separation section. It introduces a mechanical action (temporary bending) that facilitates the separation process, enabling the fixed friction section to work more effectively on already-separated or pre-separated media.
2Productivity
If multiple overlapped image receiving media are conveyed to the pair of rollers, then the conveyance function is provided, but the media cannot be separated and double feeding occurs
Solution Approach 1:
The rotating body performs preliminary separation action on overlapped media before they reach the conveyance path. By temporarily bending the media, it ensures that even multiple overlapped sheets are separated in advance, allowing the pair of rollers to convey them reliably without double feeding.
3Reliability
If the rotating body temporarily bends sheets to allow air entry, then sheet separation is improved, but the device structure becomes more complex
Solution Approach 1:
The rotating body performs preliminary bending action that temporarily changes the shape of the image receiving medium. This simple mechanical action creates air gaps between overlapped sheets, enabling effective separation without requiring complex separation mechanisms.
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 suppresses double feeding by ensuring proper separation of overlapped sheets before they reach the rollers, even with high-adhesion recycled paper, simplifying the device configuration and reducing the risk of tangling.
Implementation Method 1
where the rotating body is arranged at the upstream side of the separation section in a conveyance direction of the image receiving medium, is capable of contacting with the placed image receiving medium, and is rotatable. The control device carries out control to rotate the rotating body at least before an operation of the paper feed section. With this constitution, the rotating body can temporarily bend the placed image receiving medium, and air can enter between placed image receiving media
Implementation Method 2
The fixed friction section is fixed to a fixed position of the inclined section. The fixed friction section applies a friction force to the image receiving medium sent out from the pickup roller
Data Source
AI summary
A paper feed apparatus comprises a paper feed section, a separation section, a rotating body and a control device. The paper feed section feeds an image receiving medium that is placed. The separation section is arranged at a downstream side of the paper feed section in a conveyance direction of the image receiving medium. If a plurality of the image receiving media fed from the paper feed section is overlapped, the separation section separates the plurality of the image receiving media that is overlapped. The rotating body is arranged at the upstream side of the separation section in the conveyance direction of the image receiving medium. The rotating body is capable of contacting with the placed image receiving medium. The rotating body is rotatable. The control device carries out control to rotate the rotating body at least before an operation of the paper feed section.