Adjustable Guide Surface Angle for Paper Feeding Cassette
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Solution Overview
Problem
Existing paper feeding devices face issues with paper jams and overlapped transport due to fixed inclination units, which fail to adapt to varying stacking angles and surface conditions of sheets, leading to inadequate frictional forces for proper sheet separation.
Innovation Solution
A paper feeding device with a guide unit having an adjustable inclination angle, controlled by a drive unit and sensor system, which changes the guide surface inclination based on the stacking surface angle to maintain optimal frictional force and prevent paper jams and overlapped transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the inclination unit is fixed at a fixed position, then the device structure is simple, but the approach angle to the inclined surface becomes inappropriate when stacking angle changes, causing paper jams or insufficient frictional force
Solution Approach 1:
The inclination unit is made adjustable rather than fixed, allowing the guide surface inclination angle to be dynamically changed according to the stacking surface angle. This enables the system to adapt to different sheet stacking conditions while maintaining appropriate approach angles, preventing both paper jams and insufficient frictional force.
Solution Approach 2:
The inclination angle of the guide surface is changed as a variable parameter based on the stacking surface angle. By adjusting this geometric parameter, the system optimizes the approach angle for different stacking conditions, ensuring proper sheet separation and preventing paper jams without requiring complex structural changes.
2Ease of operation
If the approach angle to the inclined surface is too large, then sheet handling is simple, but the sheet collides with the inclined surface causing paper jams
Solution Approach 1:
The system uses a sensor to detect the stacking surface angle and provides feedback to the control unit, which then adjusts the inclination unit accordingly. This closed-loop feedback mechanism ensures the approach angle remains within the optimal range, preventing sheet collision and paper jams while maintaining reliable operation.
Solution Approach 2:
The inclination of the guide surface is adjusted in advance based on the detected stacking surface angle before sheet feeding begins. This preliminary adjustment ensures that the approach angle is already optimized when sheets are fed, preventing collision and paper jams before they can occur.
3Reliability
If the approach angle to the inclined surface is too small, then paper jams are prevented, but the frictional force is insufficient causing overlapped transport
Solution Approach 1:
The guide surface inclination angle is dynamically adjusted to maintain the approach angle within the optimal range. This dynamic adjustment ensures sufficient frictional force between the sheet and inclined surface for proper sheet separation, preventing overlapped transport while avoiding paper jams.
Solution Approach 2:
The inclination angle parameter is optimized by changing it according to the stacking surface angle. This parameter optimization ensures the approach angle provides adequate frictional force for sheet separation, maintaining both reliability in paper jam prevention and productivity in sheet separation effectiveness.
4Device complexity
If the guide surface inclination angle is not adjusted according to stacking surface angle, then device complexity is low, but sheet separation reliability deteriorates
Solution Approach 1:
A sensor detects the stacking surface angle and provides feedback to the control unit, which automatically adjusts the inclination unit. This feedback-based automatic control improves sheet separation reliability by adapting to varying stacking conditions without requiring manual intervention or overly complex control systems.
Solution Approach 2:
The system performs self-adjustment of the guide surface inclination based on sensor feedback about the stacking surface angle. This self-service capability maintains reliable sheet separation by automatically optimizing the approach angle according to actual stacking conditions, reducing the need for external control or monitoring.
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 prevents paper jams by adjusting the guide surface angle to match the stacking surface angle, ensuring proper sheet separation and reducing the risk of overlapped transport, even with varying sheet conditions, thereby enhancing the reliability and efficiency of the paper feeding process.
Implementation Method 1
The inclination unit applies frictional force from the inclined surface to the sheet which is delivered from the pickup roller
Data Source
AI summary
A paper feeding device according to an embodiment includes a paper feeding cassette that holds a plurality of sheets and has a stacking surface with an angle A relative to horizontal that changes depending on a quantity of sheets stacked thereon. A pickup roller feeds the plurality of sheets from the paper feeding cassette. A separation roller separates the plurality of sheets from each other in a case where the plurality of sheets are fed from the paper feeding cassette in an overlapped state. A guide unit has a guide surface which is inclined upwards on a downstream side thereof in the transport direction of the plurality of sheets. A drive unit changed an angle B of the guide surface relative to horizontal. A control device controls the drive unit to change the angle B based on the angle A.