Paper Feeding Mechanism With Dynamic Input Tray Height Adjustment
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Solution Overview
Problem
Conventional paper feeding mechanisms in automatic document feeders face issues with reduced picking strength as the stack of paper thins, leading to instability in paper pickup, potentially causing empty catching or failure to pick up paper.
Innovation Solution
A paper feeding mechanism with a pivoted input tray, an elevating assembly driven by a rotating shaft with cam parts and an elastic element, and a control system with a paper sensor, which adjusts the input tray's height and position to maintain a stable picking force, ensuring effective paper pickup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the input tray height is kept constant, then the structure is simple, but the picking strength weakens as the paper stack thins
Solution Approach 1:
The input tray height is changed from static to dynamic, automatically adjusting with the paper stack thickness. The elevating assembly includes a drive shaft, gear assembly, rotating shaft with cam parts, and elastic element that work together to modulate the tray height dynamically, ensuring consistent picking strength throughout the paper feeding process.
Solution Approach 2:
The physical parameter of input tray height is changed based on paper stack thickness. The elastic element and cam parts mechanism transforms the thickness parameter into height adjustment, maintaining optimal picking conditions regardless of whether the stack is full or nearly empty.
2Productivity
If the pickup assembly continuously picks paper, then productivity is high, but empty catching occurs when the stack is thin
Solution Approach 1:
A paper sensor provides feedback on paper stack presence and thickness to the control system. The control system uses this feedback to regulate the drive assembly, adjusting the elevating assembly and pickup assembly operation to prevent empty catching while maintaining continuous paper feeding and high productivity.
Solution Approach 2:
The input tray height is adjusted in advance according to the paper stack thickness before picking begins. The elastic element pre-positions the tray at the appropriate height, ensuring the pickup assembly maintains stable contact with the paper throughout the feeding process, preventing empty catching.
3Force
If the input tray is fixed in position, then the structure is simple, but the pickup strength becomes unstable as paper is consumed
Solution Approach 1:
The elevating assembly merges multiple components (drive shaft, gear assembly, rotating shaft with cam parts, elastic element) into a compact unit that automatically adjusts input tray height. This integrated mechanism maintains stable pickup strength without requiring complex separate adjustment systems for each component.
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 mechanism ensures stable and powerful paper pickup by modulating the input tray's height and position, preventing empty catching and maintaining consistent picking strength throughout the paper feeding process, while maintaining a simple structure and lower manufacturing costs.
Implementation Method 1
an elastic element. The rotating shaft is capable of rotating to make the cam parts press downward on or break away from the input tray so as to drive the input tray to swing downward or swing upward under an elastic push action of the elastic element
Implementation Method 2
The rotating shaft is capable of rotating to make the cam parts press downward on or break away from the input tray so as to drive the input tray to swing downward or swing upward
Data Source
AI summary
A paper feeding mechanism includes a mechanical frame, a drive assembly mounted to the mechanical frame, an input tray, a pickup assembly driven by the drive assembly, an elevating assembly and a control assembly. The elevating assembly mounted to the mechanical frame and pivoted to a bottom of the rear end of input tray includes a drive shaft, a gear assembly and an elastic element. The rotating shaft defines two cam parts projecting beyond the rotating shaft. The rotating shaft is capable of rotating to make the cam parts press downward on or break away from the input tray so as to drive the input tray to swing downward or swing upward under an elastic push action of the elastic element. The control assembly includes a control system and a paper sensor controlled by the control system for detecting whether there is any paper on the input tray.