Inkjet Printer Sheet Feed Correction for Borderless Banding
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Solution Overview
Problem
Inkjet printers face issues with 'banding' in recorded images due to the extension or contraction of recording sheets caused by ink permeation, leading to alignment problems and margin control challenges, especially in borderless printing.
Innovation Solution
An image recording apparatus and method that includes a feeding device and a recording device, with a feed-amount correcting portion to adjust the target feed amount based on the expected extension or contraction of the recording sheet, and a recording-position adjusting portion to adjust the image initiation position, ensuring that the image is recorded without margins on the bottom end and maintaining alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the target feed amount is corrected based on expected sheet extension or contraction, then banding is reduced and image alignment is improved, but the recording position must be adjusted which complicates the control system
Solution Approach 1:
The feed amount is corrected in advance based on expected sheet extension or contraction before the actual recording process. The control unit calculates the corrected feed amount using predetermined correction values that account for the sheet's dimensional changes due to ink absorption, thereby preventing banding and alignment issues before they occur.
Solution Approach 2:
The system incorporates feedback mechanisms where the control unit continuously monitors the recording process and adjusts the feed amount based on detected sheet characteristics. Correction values are stored and retrieved based on sheet type, size, and recording conditions, creating a closed-loop control system that adapts to varying conditions.
2Manufacturing precision
If the feed amount is increased to compensate for sheet contraction, then image alignment is maintained, but the bottom end margin becomes insufficient or negative in borderless printing
Solution Approach 1:
Different correction values are applied to different regions of the sheet. The feed amount correction is localized to specific areas based on the sheet type and recording conditions. The control unit selects appropriate correction values from stored data that are tailored to specific sheet characteristics, applying precise local adjustments rather than uniform corrections across the entire sheet.
Solution Approach 2:
The system dynamically adjusts the feed amount and recording position based on real-time detection of sheet characteristics. The control unit modifies recording parameters on-the-fly according to the actual sheet behavior, enabling adaptive control that responds to variations in sheet material properties, size, and recording conditions.
3Manufacturing precision
If the recording position is adjusted to compensate for feed amount correction, then banding is reduced, but the control complexity increases
Solution Approach 1:
The recording position is adjusted in advance based on predetermined correction values before the actual recording begins. The control unit calculates the necessary position shift using stored correction data that accounts for sheet extension or contraction, thereby pre-compensating for dimensional changes and simplifying the control process.
Solution Approach 2:
The system uses stored correction values and recording patterns that have been previously determined and optimized. Instead of calculating complex position adjustments in real-time, the control unit retrieves pre-computed correction data based on sheet type and recording conditions, simplifying the control logic while maintaining precision.
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 reduces banding by compensating for sheet extension or contraction, maintaining image alignment, and preventing margin issues on the recording medium, even in borderless printing scenarios.
Implementation Method 1
the recording sheet is elongated or contracted when droplets of ink are landed on and permeated into the recording sheet
Data Source
AI summary
An image recording apparatus includes a feeding device which feeds a recording medium based on a target feed amount, a recording device which records an image on the recording medium that is fed by the feeding device, a feed-amount correcting portion which corrects the target feed amount, and a recording-position adjusting portion which adjusts a first position in which an image recording is initiated on the recording medium, corresponding to a correction of the target feed amount by the feed-amount correcting portion.