Link-Based Paper Separating Mechanism for Residual Jam Prevention
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Solution Overview
Problem
Image forming apparatuses face issues with residual paper jamming and print defects due to the difficulty in removing residual paper between the separating unit and the pickup unit, which can lead to imperfect coupling of the paper feeding cassette and damage to the separating or pickup units during removal.
Innovation Solution
An image forming apparatus with a paper separating member featuring a plurality of links and an elastic member, where the first link is pressed by the paper feeding cassette to pivotally rotate the second link and apply pressure to the separating unit, preventing multiple sheets of paper from being delivered and facilitating easy removal of residual paper by releasing pressure when the cassette is separated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the separating unit presses the pickup unit to prevent multiple sheets from being picked up, then paper separation is improved, but residual paper becomes difficult to remove and may jam between the units
Solution Approach 1:
The separating unit is designed with a movable structure that dynamically adjusts its pressing force. During normal operation, the separating unit applies pressure to prevent multiple sheet pickup. When the cassette is removed, the pressing force is automatically released, allowing easy residual paper removal. This dynamic adjustment resolves the contradiction between maintaining separation precision and enabling easy paper removal.
2Reliability
If the separating unit applies continuous pressure to the pickup unit, then paper separation is maintained, but the paper feeding cassette may be imperfectly coupled or damaged when forcibly removed
Solution Approach 1:
The design incorporates a preliminary release mechanism that anticipates cassette removal. When the cassette is pulled out, the separating unit's pressing action is automatically deactivated before any potential damage can occur. This preliminary anti-action prevents both imperfect coupling and damage to the pickup unit, while maintaining reliable paper separation during normal operation.
3Productivity
If the pickup unit picks up multiple sheets of paper, then paper feeding speed is improved, but print defects or jams occur
Solution Approach 1:
The separating unit applies a controlled pressing force that is sufficient to prevent multiple sheet pickup but not so strong as to impede the primary sheet's feeding. This partial action allows the pickup unit to feed paper at normal speed while the separating unit ensures only one sheet is delivered to the printing device, preventing both productivity loss and printing defects.
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 solution simplifies the removal of residual paper, prevents print defects, and ensures stable coupling of the paper feeding cassette, reducing the risk of damage to the separating or pickup units during removal.
Implementation Method 1
an elastic member provided between the first link and the second link to allow the first link, pressed by the paper feeding cassette, to press the second link
Data Source
AI summary
An image forming apparatus having a structure to prevent print defects caused by residual paper. The image forming apparatus includes a main body, a paper feeding cassette separably mounted to the main body, a pickup member to pick up paper from the paper feeding cassette, and a paper separating member including a plurality of links to apply pressure to the pickup member when the paper feeding cassette is mounted to the main body and to release the pressure applied to the pickup member when the paper feeding cassette is separated from the main body. The paper separating member includes a first link to be pressed by the paper feeding cassette, a second link provided with a separating unit to press the pickup member, and an elastic member between the first link and the second link to allow the first link to press the second link.