Dual-Cap Maintenance Device for Inkjet Printhead Humidity Control
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Solution Overview
Problem
Inkjet printers face issues with nozzle clogging and defective printing due to ink drying and solidification in the liquid discharge head, leading to viscosity increases and bubble formation, which are not effectively addressed by existing maintenance methods.
Innovation Solution
A maintenance device comprising a first cap to seal the nozzle face, a second cap to seal the first cap and the contact portion, and a humidity conditioner to maintain a constant humidity within the sealed space, preventing ink drying and maintaining ink viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single cap is used to seal the nozzle face, then the structure is simple, but ink drying and solidification cannot be effectively prevented
Solution Approach 1:
The cap structure is divided into two separate caps: a first cap that seals the nozzle face and a second cap that seals the first cap and the contact portion. This segmentation allows each cap to perform its specific sealing function independently, creating a more effective double-sealing mechanism that prevents ink drying and solidification while managing the complexity through functional division.
Solution Approach 2:
The first cap is placed inside the second cap, forming a nested structure. The first cap seals the nozzle face, while the second cap encloses the first cap and the contact portion between the nozzle face and the first cap. This nesting arrangement creates a hierarchical sealing system that effectively isolates the ink from drying conditions.
2Reliability
If the contact portion is not sealed, then the structure is simpler, but ink solidification occurs on the contact portion
Solution Approach 1:
The sealing function is segmented between two caps, with the second cap specifically tasked with sealing the contact portion. This division allows the contact portion to be properly sealed without requiring the first cap to perform multiple functions, thereby preventing ink solidification while keeping each component's design relatively simple.
Solution Approach 2:
The second cap acts as an intermediary sealing element that bridges the gap between the first cap and the external environment. It specifically seals the contact portion where the first cap meets the nozzle face, preventing ink from solidifying in this critical interface area.
3Reliability
If humidity is not controlled, then the device is simpler, but ink viscosity increases due to drying
Solution Approach 1:
The humidity level within the sealed space is actively controlled and maintained at an appropriate level using a humidity controller. This parameter control prevents the ink from drying out and maintains stable ink viscosity, ensuring reliable ink discharge while the sealing structure manages the complexity of humidity control.
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 solution effectively prevents ink drying and solidification, enhancing wiping capability and reducing the probability of malfunction, thereby ensuring reliable ink discharge and preventing defective printing.
Implementation Method 1
The humidity conditioner adjusts humidity in a space between the first cap and the second cap
Implementation Method 2
a nozzle face is capped to keep the nozzle face and the adjacent area at a constant vapor pressure, thereby inhibiting the ink from drying
Data Source
AI summary
A maintenance device used in a liquid discharge head includes a first cap to seal a nozzle face of the liquid discharge head, a second cap disposed outside the first cap, and a humidity conditioner disposed outside the first cap and inside the second cap. The second cap seals the first cap and at least a contact portion between the nozzle face of the liquid discharge head and the first cap. The humidity conditioner adjusts humidity in a space between the first cap and the second cap.