Contact Pressure Adjustment for Inkjet Sheet Conveyance
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Solution Overview
Problem
Inkjet recording apparatuses face issues with ink adherence to rollers due to incomplete drying of ink images, leading to image quality deterioration, despite the use of dryers, especially when sheets are conveyed by conveying roller pairs.
Innovation Solution
An image recording apparatus with a contact pressure adjustment mechanism that includes a drive roller, a driven roller, and a vibration detection system to adjust contact pressure based on detected sheet vibrations, ensuring optimal frictional forces to prevent ink transfer to rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dryer is provided to dry ink on the recording surface, then the drying speed is improved, but the ink inside the ink image remains undried and adheres to the conveying roller
Solution Approach 1:
The invention changes the contact pressure parameter of the conveying roller to suppress ink adherence. By adjusting the contact pressure between the drive roller and driven roller, the sheet is conveyed with reduced friction, preventing ink from adhering to the roller surface even when the interior of the ink image is not fully dried.
Solution Approach 2:
The invention introduces a vibration detection mechanism that monitors vibration levels during sheet conveyance. When vibration exceeds a predetermined threshold, the system automatically adjusts the contact pressure of the conveying roller, creating a closed-loop feedback system that maintains optimal conveyance conditions and prevents ink transfer.
2Stability of the object's composition
If contact pressure is increased to improve sheet conveyance, then conveyance stability is improved, but ink adheres to the roller surface due to higher friction
Solution Approach 1:
The invention optimizes the contact pressure parameter to a specific range that balances conveyance stability with ink transfer prevention. By precisely controlling the contact pressure between rollers, the system maintains sufficient friction for stable sheet conveyance while preventing excessive friction that would cause ink adherence.
Solution Approach 2:
The invention makes the contact pressure dynamic rather than fixed. The contact pressure is automatically adjusted based on real-time vibration detection, allowing the system to adapt to different sheet conditions and ink states, thereby maintaining optimal performance across varying operating conditions.
3Device complexity
If conventional conveying methods are used, then the device complexity is low, but image quality deteriorates due to ink transfer
Solution Approach 1:
The invention adds a vibration detection portion and control logic that monitors and adjusts conveying roller contact pressure in real-time. This feedback mechanism detects vibration caused by ink adherence and automatically corrects the contact pressure, preventing image quality deterioration while maintaining relatively simple device architecture.
Solution Approach 2:
The system performs self-adjustment of conveying parameters through automatic vibration-based control. The conveying mechanism monitors its own performance through vibration detection and autonomously adjusts contact pressure to prevent ink transfer, eliminating the need for complex external control systems or manual intervention.
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 effectively prevents ink adherence to rollers by optimizing contact pressure, maintaining stable sheet conveyance and improving image quality by minimizing ink transfer during the printing process.
Implementation Method 1
a vibration detection portion configured to detect vibration generated in the sheet conveyed on the conveying path
Implementation Method 2
a drive roller configured to convey the sheet along a predetermined conveying path by coming in contact with the sheet on which an image is recorded by the image recording portion and applying a conveying force to the sheet
Data Source
AI summary
The technology according to the present disclosure is a contact pressure adjustment method capable of suppressing adhesion of ink to a roller surface of a roller that conveys a sheet on which an image has been recorded, in an image recording apparatus. The contact pressure adjustment method includes: causing an image recording portion of an image recording apparatus to record a predetermined test image on a sheet; causing a vibration detection portion to detect vibration generated in the test image recorded sheet on which the test image is recorded while the test image recorded sheet is being conveyed along a conveying path; and in a case where a fluctuation width of the vibration detected by the vibration detection portion is outside a predetermined reference range, adjusting contact pressure of a driven roller against the image recording surface of the test image recorded sheet.