Media Deformation Compensation in Printing Apparatus
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Solution Overview
Problem
Printing systems face challenges in maintaining consistent media advancement and print quality due to elastic deformations in various types of printing media, which can lead to quality issues as the media's tension and stretchability vary, affecting the precise control of printing fluid ejection.
Innovation Solution
A controller-based system that includes a displacement mechanism and media advancement sensor to measure and adjust media tension and deformation, modifying printing parameters such as print job images, printhead alignment, and media advancement to compensate for media elasticity, ensuring accurate printing across different media types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If media tension is increased to reduce elastic deformation, then print quality improves, but media advancement precision deteriorates due to over-stretching
Solution Approach 1:
The system uses media advancement sensors to measure actual media displacement and feeds this information back to the controller. The controller calculates deformation factors based on the difference between expected and actual advancement, then adjusts printing parameters accordingly. This closed-loop feedback mechanism resolves the contradiction by dynamically compensating for elastic deformation without requiring excessive media tension.
Solution Approach 2:
The system changes printing parameters (such as ejection timing, position, and velocity) based on calculated deformation factors. By adjusting these parameters dynamically according to measured media advancement, the system maintains print quality while avoiding the need to increase media tension, thus preserving media advancement precision.
2Measurement precision
If media tension is decreased to maintain media advancement precision, then media advancement precision improves, but print quality deteriorates due to increased elastic deformation
Solution Approach 1:
The feedback mechanism continuously monitors media advancement and calculates deformation factors. Even with lower media tension, the system compensates for elastic deformation by adjusting printing parameters based on real-time measurements, thereby maintaining both media advancement precision and print quality.
Solution Approach 2:
The system performs preliminary measurement of media advancement characteristics during a test pattern print. Based on these measurements, it pre-calculates deformation factors that are then applied to subsequent printing operations. This preliminary characterization allows the system to compensate for elastic deformation before actual printing begins.
3Manufacturing precision
If deformation compensation is implemented to maintain print quality, then print quality improves, but device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The system uses the printer's existing media advancement mechanism to perform self-measurement during normal operation. By printing test patterns and measuring their actual advancement, the system characterizes media elastic properties without requiring separate testing equipment. This self-service approach reduces device complexity while maintaining print quality.
Solution Approach 2:
The media advancement sensors serve multiple functions: they monitor media position during printing, measure elastic deformation characteristics, and provide feedback for real-time compensation. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity.
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
This solution enables superior print quality by accurately controlling media advancement and deformation, accommodating diverse media types and properties, thereby enhancing the precision and consistency of printing fluid ejection.
Implementation Method 1
elastic deformations in various types of printing media, which can lead to quality issues as the media's tension and stretchability vary
Data Source
AI summary
A printing apparatus is disclosed herein. The apparatus comprises a platen to hold a media thereon, the media moveable along a media path direction; a displacement mechanism to move the media over the platen and along the media path direction; a media advancement sensor to measure the displacement of the media; and a controller. The controller to control the displacement mechanism to move the media over the platen at a tension; to determine, through the media advancement sensor, media advancement data indicative of the displacement of the media; to determine a deformation factor based on the tension and the media advancement data; and to modify a printing parameter based on the deformation factor.