Decurler Roller Gap Adjustment for Ink Buildup Wrinkle Mitigation
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Solution Overview
Problem
Inkjet printers using aqueous inks often experience media deformation, particularly sheet wrinkling due to ink buildup on the decurler's indenting shaft, which degrades image quality and requires costly service interventions.
Innovation Solution
Implementing a 'long' homing sequence algorithm that increases the gap between the decurler's hard and soft rollers when ink buildup occurs, ensuring they match speed and maintain a slight center-to-center distance, mitigating sheet wrinkling by compensating for the artificial increase in shaft diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the decurler operates under stress paper and ink loading conditions, then it effectively counteracts down-curl from printed images, but ink buildup occurs on the indenting shaft causing sheet wrinkle
Solution Approach 1:
The system performs a 'long' homing sequence at startup and after idle periods, which establishes the correct initial gap between rollers before processing begins. This preliminary positioning prevents ink buildup-related wrinkling by ensuring proper nip alignment from the start of operation.
Solution Approach 2:
The system uses sensors to detect sheet wrinkles during operation and automatically adjusts the decurler gap in response. This feedback mechanism compensates for ink buildup on the indenting shaft by increasing the gap when wrinkling is detected, maintaining reliable decurling despite contamination.
2Manufacturing precision
If the gap between decurler rollers is reduced for precise sheet handling, then sheet control improves, but ink buildup on the shaft causes excessive wrinkle
Solution Approach 1:
The decurler gap is made dynamically adjustable rather than fixed. The system can change the gap between the hard shaft and soft roller based on operating conditions, ink buildup levels, and sheet characteristics, allowing optimization between precise handling and wrinkle prevention.
Solution Approach 2:
The system changes the physical parameter of the roller gap in response to detected conditions. By automatically increasing the gap when ink buildup is detected or during the 'long' homing sequence, the system compensates for the artificial increase in shaft diameter and prevents excessive wrinkling.
3Object-affected harmful factors
If manual intervention is used to clean the indenting shaft, then ink buildup is removed, but production stops and service calls increase
Solution Approach 1:
The decurler system performs self-maintenance through automated gap adjustment and the 'long' homing sequence, which compensates for ink buildup without requiring manual intervention. This self-service capability maintains production continuity by preventing wrinkle-related stoppages.
Solution Approach 2:
The system continuously monitors sheet quality and automatically responds to ink buildup conditions by adjusting the decurler gap, eliminating the need for manual cleaning interventions and maintaining uninterrupted production.
Data Source
AI summary
A decurler method and apparatus that compensates for ink contamination buildup on an indent roll of a decurler in aqueous ink jet products that can lead to paper wrinkle. A gap between the centers of the indent roll and a soft roll is increased to prevent sheet wrinkle by employing an algorithm that determines when the rolls are in contact and are first matching speed with each other and then treats this position as a home position.