Drop Generator Wear Mitigation in Printing Systems
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Solution Overview
Problem
In printing systems, drop generators such as piezoelectric elements or resistors can experience damage through burn-in, leading to uneven wear and reduced performance, particularly when printing long lines or repetitive patterns, resulting in defects like lighter or darker bands in printed images.
Innovation Solution
The implementation of a damage mitigating apparatus within the printing system's controller, which controls drop generators to operate evenly by determining the activation sequence and timing, preventing excessive use of specific drop generators and shifting the image processing pipeline to mitigate damage without moving the drop generators or image placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same drop generators are repeatedly activated to print long lines or repetitive patterns, then printing productivity is improved, but damage to drop generators increases due to uneven wear and burn-in
Solution Approach 1:
The system dynamically adjusts the activation sequence of drop generators based on wear patterns. Instead of fixed sequential activation, the controller modifies which drop generators are activated in each pass, creating a dynamic distribution pattern that prevents any single generator from being overused during repetitive printing operations
Solution Approach 2:
The system changes the operational parameters of drop generators by varying activation sequences and timing between passes. This parameter variation ensures that different drop generators are activated at different times, distributing wear more evenly across all generators while maintaining high printing productivity
2Manufacturing precision
If drop generators are activated to print high-quality images, then manufacturing precision is improved, but damage to drop generators increases due to excessive activation
Solution Approach 1:
The system implements periodic variation in drop generator activation patterns. By changing the activation sequence periodically between passes rather than maintaining a fixed pattern, the system distributes the burden of high-precision printing across all drop generators over time, preventing any single generator from experiencing excessive activation
Solution Approach 2:
The activation pattern is made dynamic rather than static, allowing the system to adapt which drop generators are used for critical high-precision printing tasks in different passes. This dynamic allocation maintains print quality while distributing wear evenly across the drop generator array
3Productivity
If the activation sequence of drop generators is optimized for speed, then productivity is improved, but uneven wear occurs leading to banding defects
Solution Approach 1:
The system dynamically varies the activation sequence between passes while maintaining optimized timing within each pass. This dynamic reconfiguration ensures that no single drop generator is consistently overactivated, preventing banding defects while preserving high printing speed through optimized activation timing
Solution Approach 2:
The system changes operational parameters by varying which drop generators are activated in different passes while maintaining optimized activation timing. This parameter variation distributes wear evenly across all generators, eliminating banding defects without sacrificing printing speed
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 approach effectively delays or prevents damage to drop generators, ensuring even wear and maintaining print quality by controlling the activation of drop generators to distribute wear evenly across the printheads, thus avoiding defects like banding in printed images.
Implementation Method 1
Piezoelectric printhead technology typically includes the repeated actuation of piezoelectric elements to fire ink through a plurality of nozzles onto a media
Implementation Method 2
Thermal ink-jet printing technology typically includes the repeated heating of resistors to fire ink through a plurality of nozzles onto a media
Data Source
AI summary
According to an example, in a method for mitigating damage to a plurality of drop generators in a printing system, data corresponding to an image to be printed on a media by the printing system may be accessed. In addition, the plurality of drop generators may be controlled to print the image on the media while mitigating damage to the plurality of drop generators and without shifting placement of the image on the media or shifting the plurality of drop generators in a direction perpendicular to a feed direction of the media.