Printhead Maintenance Facility Ink Drainage
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Solution Overview
Problem
Inkjet printheads with pagewidth designs face issues with ink buildup during maintenance operations, leading to potential clogging and color mixing due to small nozzles and the need for sophisticated maintenance facilities that can manage large ink purging, which can result in ink accumulation and artifacts on printed images.
Innovation Solution
A printhead maintenance facility with an ink storage reservoir and an outlet coupling for connection to a vacuum source to draw out excess ink, ensuring continuous ink drainage and preventing buildup on maintenance structures, including a core for mounting in a printer with movable maintenance structures relative to the reservoir.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pagewidth printhead with small nozzles is used to achieve high resolution and print speeds, then printing performance is improved, but ink buildup and clogging occur during maintenance operations
Solution Approach 1:
The patent extracts the harmful ink buildup from the maintenance structures by providing dedicated drainage paths that channel excess ink away from the printhead and maintenance components. This prevents ink accumulation that would otherwise cause clogging in the small nozzles of the pagewidth printhead.
Solution Approach 2:
The patent introduces intermediate drainage structures and fluid communication pathways as mediators between the ink storage reservoir and the maintenance structures. These intermediaries facilitate the removal of excess ink during maintenance operations, preventing direct contact between accumulated ink and the sensitive nozzle array.
2Ease of repair
If sophisticated maintenance facility is used to manage large ink purging, then printhead recovery is improved, but ink accumulation on maintenance structures occurs
Solution Approach 1:
The patent extracts excess ink from the maintenance facility by providing dedicated drainage paths and fluid communication pathways that channel ink away from maintenance structures to a collection reservoir. This prevents ink accumulation that would compromise maintenance effectiveness.
Solution Approach 2:
The patent employs hydraulic principles by establishing fluid communication pathways that utilize gravity and pressure differentials to drain ink from the maintenance structures to the reservoir. This passive hydraulic system efficiently removes accumulated ink without requiring additional active pumping mechanisms.
3Quantity of substance
If ink storage reservoir is filled to capacity after prolonged use, then ink collection is improved, but ink drainage from maintenance structures is blocked
Solution Approach 1:
The patent introduces dynamic elements including a movable core that can rotate to present different maintenance structures to the printhead, and a vacuum source that can be activated to actively draw ink from the reservoir. These dynamic mechanisms ensure continuous drainage capability even as the reservoir fills during prolonged operation.
Solution Approach 2:
The patent implements feedback through the vacuum source system that can detect and respond to ink level conditions in the reservoir. When ink accumulation approaches capacity, the vacuum system can be activated to actively remove ink, maintaining drainage efficiency and preventing blockage of the drainage paths.
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
Prevents ink buildup on maintenance structures, ensuring proper operation and reducing the risk of artifacts in printed images by facilitating the bulk removal of excess ink during maintenance, maintaining efficient printhead performance.
Implementation Method 1
an outlet coupling in fluid communication with the ink storage reservoir and configured for connection to a vacuum source to draw ink out of the ink storage reservoir
Data Source
AI summary
A printhead maintenance facility is provided having a storage reservoir for storing fluid ejected by a printhead and a core movable relative to the printhead. The has an internal structure defining the storage reservoir and having a port in fluid communication with the storage reservoir, and an external structure movable relative to the internal structure and having a drain movable into registration with the port to establish fluid communication between the drain and storage reservoir.