Inkjet Head Maintenance Control Based on Sub-Tank Ink Levels
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Solution Overview
Problem
Inkjet printers face issues with inkjet head failures due to ink drying and abnormal ink supply, particularly during long operations without human intervention, and existing systems fail to flexibly manage maintenance and ink supply abnormalities.
Innovation Solution
A printing device with a sub-tank system that monitors ink levels and adjusts maintenance based on ink availability, including normal, low-consumption, and non-consumption maintenance modes, and a notification system for ink flow abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If maintenance is stopped to save ink, then ink consumption is reduced, but inkjet head failure occurs due to drying
Solution Approach 1:
The system performs maintenance operations in advance before ink runs out completely. By monitoring sub-tank ink levels and predicting when maintenance will be needed, the system schedules maintenance proactively, ensuring the inkjet head remains functional while minimizing unnecessary ink consumption during idle periods
Solution Approach 2:
The system continuously monitors ink levels in the sub-tank and adjusts maintenance scheduling based on real-time feedback. When ink levels are low, the system reduces or skips maintenance operations to conserve ink, while still maintaining adequate nozzle function through selective maintenance of only those nozzles that show signs of deterioration
2Reliability
If maintenance is performed frequently to prevent failure, then inkjet head reliability is improved, but ink consumption increases
Solution Approach 1:
Instead of performing full maintenance on all nozzles uniformly, the system applies partial maintenance only to specific nozzles that require it. By identifying individual nozzle conditions and targeting maintenance selectively, the system achieves adequate reliability while significantly reducing overall ink consumption compared to comprehensive maintenance of all nozzles
Solution Approach 2:
The system dynamically changes maintenance parameters such as maintenance frequency, intensity, and scope based on actual inkjet head conditions and ink availability. When ink levels are sufficient and nozzles show deterioration, more intensive maintenance is applied; when ink is low and nozzles are functioning, maintenance is reduced or skipped, optimizing the balance between reliability and ink consumption
3Reliability
If ink supply is monitored continuously to detect abnormalities, then ink supply reliability is improved, but device complexity increases
Solution Approach 1:
The monitoring system is divided into simple, modular components: an ink level sensor in the sub-tank, a flow sensor in the ink supply line, and a controller that processes their signals. By segmenting the monitoring function into simple, dedicated sensors rather than using a complex integrated system, the patent achieves reliable ink supply monitoring while keeping individual components simple and easy to implement
Data Source
AI summary
The present invention more appropriately manages maintenance executed on an inkjet head. A printing device that performs printing through an inkjet method includes an inkjet head, a sub-tank 202, an ink amount detection unit, and a maintenance determination unit (maintenance controller). When the amount of ink in the sub-tank 202 is equal to or larger than a first threshold, the maintenance determination unit permits purge, which is an example of a normal maintenance, as maintenance to be executed on the inkjet head to which ink is supplied from the sub-tank 202. When the amount of ink in the sub-tank 202 is less than the first threshold, the maintenance determination unit prohibits purge and permits flushing, which is an example of low-consumption maintenance, as maintenance to be executed on the inkjet head to which ink is supplied from the sub-tank 202.