Printhead Maintenance Station Air Blast Cleaning
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Solution Overview
Problem
Inkjet printheads, especially pagewidth models, face issues with printhead maintenance due to accumulation of paper dust, which can block nozzles and result in misdirected ink droplets and low print quality, as existing methods like sealing tapes and rubber squeegees are either ineffective or risk damaging the printhead.
Innovation Solution
A printhead maintenance station using a capper with a constriction member to create a blast channel, employing air blasting to remove ink and particulates from the ink ejection face without physical contact, utilizing a vacuum system and air inlet valve to manage airflow and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sealing tapes or rubber squeegees are used to clean printhead, then particulates can be removed, but the printhead may be damaged or maintenance effectiveness is insufficient
Solution Approach 1:
The patent replaces mechanical cleaning methods (rubber squeegees, tapes) with a pneumatic system that uses pressurized gas flow to remove particulates. The gas jet system directs high-velocity gas across the printhead surface, lifting and removing particulates without physical contact, thus eliminating the risk of mechanical damage while maintaining effective cleaning capability
Solution Approach 2:
The invention employs a pneumatic cleaning system where pressurized gas is delivered through a nozzle positioned close to the printhead. The gas flow creates a controlled jet that impacts particulates on the printhead surface, utilizing pneumatic force rather than mechanical contact to achieve cleaning while preserving printhead integrity
2Object-affected harmful factors
If air blasting is used to remove ink and particulates, then cleaning effectiveness is improved, but power consumption increases
Solution Approach 1:
The patent applies air blasting locally rather than globally by positioning a nozzle close to the specific area of the printhead requiring cleaning. This localized approach concentrates the gas flow energy where needed, achieving effective removal of ink and particulates while minimizing overall power consumption compared to system-wide air blasting
Solution Approach 2:
The system uses brief, targeted bursts of pressurized gas rather than continuous high-power airflow. By applying excessive local pressure for short durations only where particulates are present, the system achieves thorough cleaning while keeping average power consumption low
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
Effectively maintains printheads by purging decapped nozzles and removing flooded ink without damaging the MEMS nozzle structures, simplifying maintenance and reducing power requirements, making it suitable for desktop printers.
Implementation Method 1
generating a vacuum over said face using said vacuum system, thereby purging ink from printhead nozzles onto said face
Implementation Method 2
opening said air inlet valve, thereby blasting air through said blast channel and removing ink from said face
Data Source
AI summary
A printhead maintenance station for maintaining a printhead in an operable condition is provided. The maintenance station comprises a capper sealingly engageable around the printhead. The capper comprises a constriction member for defining a blast channel adjacent an ink ejection face of the printhead. The maintenance station further comprises a vacuum system in fluid communication with the capper and an engagement mechanism. The engagement mechanism moves the capper between a first position in which the capper is sealingly engaged around the printhead and a second position in which the capper is disengaged from around the printhead.