Sheet Container Pressing Force Adjustment for Alignment
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Solution Overview
Problem
Existing sheet feeding systems in image forming apparatuses face challenges in maintaining accurate sheet alignment and preventing buckling or wrinkling, especially when the number of sheets decreases, leading to variations in image formation due to inconsistent pressing forces.
Innovation Solution
A sheet container with a movable loader, a pair of sheet regulators, and a pressing force adjusting device that adjusts the pressing force applied by a pressing member to maintain alignment and prevent buckling, using a mechanism with biasing members and an adjuster to change the biasing force based on the number of sheets loaded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pressing member is used to press the sheet against sheet regulators, then sheet alignment is improved, but sheet buckling or wrinkling occurs when the number of sheets decreases
Solution Approach 1:
The pressing member is configured to move between a pressing position (where it presses the sheet) and a retracted position (where it releases the sheet). This dynamic adjustment allows the system to maintain optimal pressing force for alignment while preventing buckling when sheet bundles are small or empty
Solution Approach 2:
The pressing force applied by the pressing member is varied based on the number of sheets in the bundle. When the sheet bundle is full, higher pressing force is applied for accurate alignment. When the bundle size decreases, the pressing force is reduced or eliminated to prevent buckling and wrinkling
2Manufacturing precision
If constant pressing force is applied to maintain sheet alignment, then alignment accuracy is improved, but image formation varies when the number of sheets decreases
Solution Approach 1:
The sheet feeding system monitors the number of sheets in the bundle and uses this information to adjust the pressing force applied by the pressing member. This feedback mechanism ensures that pressing force is optimized for each sheet bundle size, maintaining both alignment accuracy and image formation consistency
Solution Approach 2:
Instead of applying constant pressing force, the system dynamically adjusts the pressing force based on real-time detection of sheet bundle size. This dynamic control maintains reliable image formation across varying sheet quantities
3Manufacturing precision
If pressing force is increased to prevent sheet misalignment, then sheet alignment is improved, but sheet buckling occurs especially with fewer sheets
Solution Approach 1:
The pressing member transitions between active pressing and retracted states based on sheet bundle characteristics. This dynamic behavior allows high pressing force to be applied only when needed for alignment, while avoiding buckling when sheet bundles are small
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 ensures consistent sheet alignment and prevents buckling by adjusting the pressing force in real-time, maintaining image quality even as the number of sheets decreases, and aligns the sheet feeding position to the lowermost sheet of the bundle.
Implementation Method 1
The pressing member is disposed on at least one of the pair of sheet regulators and configured to press a lateral end face of the sheet, toward another one of the pair of sheet regulators in the width direction of the sheet
Implementation Method 2
using a mechanism with biasing members and an adjuster to change the biasing force based on the number of sheets loaded
Data Source
AI summary
A sheet container includes a sheet loader, a pair of sheet regulators, a pressing member, and a pressing force adjusting device. The sheet loader is movable in a vertical direction and configured to load a sheet. The pair of sheet regulators is configured to regulate a position in a width direction of the sheet loaded on the sheet loader. The pressing member is disposed on at least one of the pair of sheet regulators and configured to press a lateral end face of the sheet, toward another one of the pair of sheet regulators in the width direction of the sheet. The pressing force adjusting device is configured to adjust pressing force generated by the pressing member to the sheet while maintaining a state in which the pressing member applies the pressing force to the sheet.