Liquid Discharging Apparatus Atmosphere Path Control
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Solution Overview
Problem
During the discharging action in liquid discharging apparatuses, sheets can jam and contact the head, leading to liquid leakage and discharging failures due to air entering the reservoir section through the atmosphere communication path, causing the liquid to leak extensively and potentially resulting in incorrect discharging.
Innovation Solution
A liquid discharging apparatus with a head, reservoir section, valve, switching assembly, and controller that controls the atmosphere communication path to prevent air from entering the reservoir section during discharging, ensuring the path is closed before injecting liquid, thereby minimizing leakage and maintaining proper discharging functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the atmosphere communication path is open during discharging action, then air can enter the reservoir section to maintain pressure, but liquid leaks extensively when sheet jams occur
Solution Approach 1:
The valve closes the atmosphere communication path before the discharging action begins and keeps it closed throughout the discharging process. This preliminary action prevents air from entering the reservoir section, which in turn prevents liquid from being drawn out through the injection port even when sheet jams occur, thereby eliminating liquid leakage while maintaining discharging reliability
2Loss of substance
If the atmosphere communication path is closed during discharging action, then liquid leakage is prevented, but air pressure in the reservoir section lowers and air is inhaled through nozzles
Solution Approach 1:
The valve closes the atmosphere communication path before discharging begins and maintains closure throughout the process. This preliminary sealing action prevents both liquid leakage and air inhalation through nozzles by maintaining a controlled pressure environment in the reservoir section, thereby resolving the contradiction between preventing leakage and maintaining discharging reliability
3Quantity of substance
If the injection port is open for liquid injection, then liquid can be supplied to the reservoir section, but liquid leaks out continuously when atmosphere communication path is open
Solution Approach 1:
The valve closes the atmosphere communication path before liquid injection begins and maintains closure during the entire injection process. This preliminary sealing prevents air from entering the reservoir section, which eliminates the pressure differential that would otherwise cause liquid to leak out through the injection port, thereby enabling liquid supply without continuous leakage
Data Source
AI summary
A liquid discharging apparatus, having a head, a reservoir section, a valve, a switching assembly, and a controller, is provided. The reservoir section has a liquid reservoir chamber, an air chamber, an injection port, and an atmosphere communication path. The switching assembly switches states of the valve between an opening state, in which the valve opens the atmosphere communication path, and a closing state, in which the valve closes the atmosphere communication path. The controller is configured to control the valve through the switching assembly to close the atmosphere communication path, control the head to discharge the liquid after closing the atmosphere communication path, and control the valve through the switching assembly to close the atmosphere communication path before the liquid is injected through the injection port.