Inkjet Maintenance Cap with Suppression Member
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Solution Overview
Problem
Inkjet recording apparatuses using water-based ink face issues with ink evaporation leading to increased viscosity, which can cause ejection failure or clogging. Existing devices that supply humidified air to prevent evaporation risk condensation on the nozzle surface, pulling ink out of the nozzle, and vibrating ink within the nozzle, potentially causing it to fall.
Innovation Solution
A maintenance device with a cap, air supply port, and a suppression member is used. The suppression member has a first gap from the air supply port and a second gap from the nozzle surface, preventing direct exposure of humidified air to the nozzle surface, thus reducing condensation and ink vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If humidified air is supplied directly to the nozzle surface to suppress water evaporation, then ink viscosity increase is prevented, but condensation occurs on the nozzle surface causing ink to be pulled out of the nozzle
Solution Approach 1:
A cap is introduced as an intermediary component between the humidified air supply and the nozzle surface. The cap receives humidified air through an air supply port and directs it to contact the inner surface of the cap rather than the nozzle surface directly. This intermediary structure allows the beneficial humidification effect to reach the ink while preventing direct condensation on the nozzle, thus resolving the contradiction between preventing ink viscosity increase and avoiding condensation-related harm.
2Reliability
If humidified air is supplied directly to the nozzle surface, then water evaporation is suppressed, but ink vibrates due to air flow causing ink to fall from the nozzle
Solution Approach 1:
The cap serves as a mediator that modifies the air flow path. Humidified air enters through the air supply port and contacts the cap's inner surface, which then directs the air flow away from direct contact with the nozzle surface. This intermediary arrangement maintains the humidification benefit while reducing air flow-induced vibration and preventing ink from falling out of the nozzle.
3Reliability
If a cap covers the nozzle surface to prevent evaporation, then ink viscosity is maintained, but the structure becomes more complex
Solution Approach 1:
The cap is designed to perform multiple functions simultaneously: it covers the nozzle surface to prevent evaporation, receives and redirects humidified air flow, and prevents both condensation and ink vibration. By integrating these multiple functions into a single component, the device complexity is minimized while achieving reliable ink flow 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 solution effectively suppresses the generation of condensation on the nozzle surface and reduces ink vibration, preventing ink from being pulled out of the nozzle or falling, thereby maintaining ink flow and preventing clogging.
Implementation Method 1
condensation may occur on the nozzle surface
Implementation Method 2
water evaporates from the ink in a nozzle
Data Source
AI summary
A maintenance device includes a cap, an air supply port, and a suppression member. The cap covers a nozzle surface of an inkjet head. The air supply port is provided in the cap. The suppression member is provided between the nozzle surface and the air supply port, and has a first gap from the air supply port and a second gap from the nozzle surface.