Ink Evaporation Control in Liquid-Ejection Apparatus Sub-Tanks
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Solution Overview
Problem
Ink evaporation in the sub-tank and liquid storage chamber of a liquid-ejection device leads to a decrease in usable ink and reduces the accuracy of residual ink detection due to atmospheric communication.
Innovation Solution
An image-recording apparatus with a cartridge having a first storage chamber and a cartridge-attachment portion with a second storage chamber, featuring a switching portion that controls air communication to minimize ink evaporation by switching the state of the second air communication portion when the liquid level in the first storage chamber is low, ensuring efficient ink supply and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If both the sub-tank and liquid storage chamber are in communication with the atmosphere to allow ink flow, then ink can be supplied from the storage chamber to the sub-tank, but ink evaporation occurs in both chambers
Solution Approach 1:
The air communication paths are segmented into two separate portions: a first air communication portion for the liquid storage chamber and a second air communication portion for the sub-tank. This segmentation allows independent control of air communication for each chamber, enabling the sub-tank to maintain atmospheric communication for ink supply while the storage chamber can be isolated to prevent evaporation.
Solution Approach 2:
The system dynamically controls air communication by switching the state of the second air communication portion based on liquid level detection. When the liquid level in the storage chamber is low, the second air communication portion is closed to prevent evaporation; when the level is sufficient, it opens to allow atmospheric communication and maintain ink flow pressure balance.
2Reliability
If the second air communication portion remains open to allow atmospheric communication, then ink flow pressure is balanced, but ink evaporation occurs and residual ink detection accuracy decreases
Solution Approach 1:
The system dynamically adjusts the state of the second air communication portion based on real-time liquid level detection. When the liquid level in the storage chamber is sufficient, the second air communication portion remains open to maintain pressure balance and reliable ink flow. When the level drops below a threshold, it closes to prevent evaporation and improve detection accuracy, thus adapting to different operational conditions.
Solution Approach 2:
The system uses liquid level detection as feedback to control the state of the second air communication portion. The detection unit monitors the liquid level in the storage chamber, and based on this feedback, the control unit switches the air communication state accordingly, creating a closed-loop control system that maintains both flow reliability and measurement precision.
3Loss of substance
If a switching portion is added to control air communication state, then ink evaporation is reduced, but device complexity increases
Solution Approach 1:
The switching function is extracted as a separate, dedicated component (switching portion) that independently controls the second air communication portion. This extraction allows the evaporation control function to be implemented with minimal integration into the existing ink supply system, reducing the complexity burden compared to redesigning the entire system.
Solution Approach 2:
The switching portion acts as an intermediary component between the liquid level detection system and the air communication path. It mediates the control action by translating detection signals into appropriate air communication states, simplifying the overall control architecture while achieving evaporation reduction.
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 reduces ink evaporation and enhances the accuracy of residual ink detection by controlling air communication, maintaining a stable ink supply and improving the usability of the ink within the storage chambers.
Implementation Method 1
ink evaporation may occur in the sub-tank and the liquid storage chamber
Implementation Method 2
determine a liquid level of the liquid stored in the first storage chamber
Data Source
AI summary
An image-recording apparatus includes a cartridge including a first storage chamber and a first air communication portion, a cartridge-attachment portion including a second storage chamber and a second air communication portion, a switching portion, and a controller. The second storage chamber stores liquid supplied from a supply portion of the cartridge connected to a connecting portion of the cartridge-attachment portion through a liquid outlet port. The switching portion switches the second air communication portion between a first state and a second state. An air flow rate through the second air communication portion per unit of time is lower in the second state than in the first state. The controller determines the liquid level of liquid in the first storage chamber and switches the switching portion to the second state when the liquid level in the first storage chamber is lower than a vertical position of the liquid outlet port.