Pivot Capping Structure for Fluidic Ejection Head Maintenance
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Solution Overview
Problem
Fluidic ejection devices face challenges in maintaining precise fluid ejection due to contamination and residue buildup on the ejection head, which can lead to inhibited fluid flow and nozzle plugging, especially in devices with small sizes where conventional maintenance methods are impractical.
Innovation Solution
A compact capping and cleaning apparatus with a pivot member and capping structure that pivots between capped and uncapped positions, incorporating a wiper blade for cleaning and an aperture for fluid flow, allowing for effective protection and maintenance of the ejection head without requiring a large area for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional maintenance devices are used for fluidic ejection heads, then cleaning and capping functions can be performed, but a relatively large area is required for operation which is not suitable for small-sized devices
Solution Approach 1:
The patent combines the capping structure and cleaning apparatus into a single integrated maintenance device. The capping structure with aperture serves both as a protective cap and as part of the cleaning mechanism, eliminating the need for separate maintenance equipment and reducing the required maintenance area to a compact footprint suitable for small-sized fluidic ejection devices.
Solution Approach 2:
The maintenance apparatus performs multiple functions including capping the ejection head to prevent contamination, cleaning the ejection head surface and nozzles using a wiper blade, and allowing fluid flow through the aperture. This multi-functional design consolidates several maintenance operations into one compact device, addressing both the reliability need for proper fluid ejection and the space constraint.
2Productivity
If the ejection head is left uncapped during use, then fluid ejection can occur, but contamination and residue buildup inhibit proper ejection and plug nozzles over time
Solution Approach 1:
The capping structure with aperture is designed to be positioned over the ejection head before contamination occurs. The aperture allows fluid ejection during use while the cap prevents contamination buildup. The preliminary placement of this protective structure eliminates the need for extensive cleaning operations later, maintaining productivity while preventing harmful contamination.
Solution Approach 2:
The maintenance apparatus enables the ejection head to be cleaned by the device itself or with minimal external intervention. The integrated wiper blade and capping structure allow the system to maintain its own functionality by preventing and removing contamination, reducing the need for external maintenance services and ensuring continuous productivity.
3Object-affected harmful factors
If the ejection head is capped to prevent contamination, then protection is provided, but fluid ejection is inhibited
Solution Approach 1:
The capping structure features a selectively positioned aperture that provides local opening only where fluid ejection is needed. The cap maintains its protective function over most of the ejection head surface while the aperture creates a localized passage for fluid flow. This local quality differentiation allows simultaneous contamination prevention and productivity maintenance.
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
The apparatus ensures proper fluid ejection by preventing contamination and residue buildup, allowing for easy cleaning and operation of fluidic ejection devices, even in small form factors, by pivoting between capped and uncapped positions to maintain the ejection head's functionality.
Implementation Method 1
a heater for vaporizing fluid ejected from the fluidic ejection head
Implementation Method 2
a wiper blade for cleaning the ejection head when the pivot member is pivoted to the first capped position and to the second uncapped position
Data Source
AI summary
An apparatus for a fluidic ejection device and a fluidic ejection device containing the apparatus. The apparatus includes a pivot member having at least a first position and a second position, a shaft attached on a first end thereof to the pivot member and on a second end distal from the first end to a capping structure, wherein pivot of the pivot member pivots the capping structure from a first capped position to a second uncapped position adjacent an ejection head of the fluidic ejection device.