Continuous Ink Replenishment System for Printing Apparatus
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Solution Overview
Problem
Current methods for replenishing the supply reservoir in printing apparatuses require disconnection and de-pressurization, leading to nozzle failures, waste of ink, and challenges in maintaining the structural integrity of secondary containers during refilling.
Innovation Solution
A system with a volume sensor and pump that continuously replenishes the supply reservoir at a pressure equal to the existing pressure, using a heat exchanger to maintain temperature, allowing for continuous operation without disconnection or de-pressurization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the supply reservoir is replenished by disconnecting and de-pressurizing the system, then the liquid supply can be refilled, but nozzle failures occur and ink is wasted
Solution Approach 1:
The system maintains continuous liquid flow through the nozzles during replenishment by using a pump to inject liquid directly into the pressurized supply reservoir. This eliminates shutdowns and maintains steady-state operation, preventing nozzle plugging and failure while ensuring continuous production without interruption.
Solution Approach 2:
A pump is introduced as an intermediary device to transfer liquid from the replenishment source into the pressurized supply reservoir. This intermediary mechanism enables liquid injection without requiring system de-pressurization or disconnection, resolving the contradiction between replenishment needs and nozzle reliability.
2Quantity of substance
If the nozzle is turned off for replenishment, then the liquid supply can be refilled, but the system takes significant time to reach steady flow rate and ink is wasted
Solution Approach 1:
The replenishment system allows the nozzle to remain continuously operational during liquid refilling. The pump injects liquid into the pressurized reservoir without interrupting the flow through the nozzle, eliminating the time required to restart the nozzle and reach steady-state flow conditions.
Solution Approach 2:
The system maintains liquid flow and pressure conditions in advance during replenishment, so when liquid is added to the reservoir, the nozzle is already primed and ready to continue dispensing immediately without requiring a restart or warm-up period.
3Quantity of substance
If the supply reservoir is opened for replenishment, then the liquid can be refilled, but the risk of gas entrapment and overfill increases
Solution Approach 1:
The pump serves as a controlled intermediary for liquid injection into the pressurized reservoir. This enables precise metering and monitoring of the replenishment process, preventing overfill conditions and eliminating the need to open the reservoir, thereby avoiding gas entrapment and contamination risks.
Solution Approach 2:
The system incorporates monitoring to detect when the reservoir is full and automatically stops the pump. This feedback control prevents overfilling and the associated risks of liquid leakage and pouch rupture, while maintaining the sealed, pressurized environment throughout the replenishment process.
4Quantity of substance
If the system is shut down for replenishment, then the reservoir can be refilled, but productivity decreases
Solution Approach 1:
The replenishment system enables continuous production by maintaining liquid flow through the nozzles while simultaneously refilling the supply reservoir. The pump injects liquid into the pressurized system without shutdown, eliminating idle time and maintaining constant productivity throughout the replenishment process.
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
Enables continuous ink replenishment without nozzle failures, minimizing ink waste and maintaining the integrity of the ink supply, ensuring consistent operation and reducing the risk of gas entrapment and overfill.
Implementation Method 1
The pump is operable to inject replenishment liquid drawn from a liquid replenishment source into the reservoir at a pressure at least substantially equal to the pressure of the liquid held in the reservoir
Implementation Method 2
A heat exchanger responsive to the temperature control signal is operable to adjust the temperature of the replenishment liquid to a temperature that lies within a predetermined range of the temperature of the liquid in the reservoir
Implementation Method 3
A volume sensor operable to generate a signal representative of the volume of liquid within the reservoir
Data Source
AI summary
A liquid replenishment system for a printing apparatus that includes a dispensing nozzle and a supply reservoir is improved by a replenishment system having a volume control network responsive to a signal representative of the volume of liquid within the reservoir for generating a volume control signal. The volume control signal is applied to a pump operable to inject replenishment liquid from a replenishment source into the reservoir. The replenishment liquid is injected at a pressure at least substantially equal to the pressure in the reservoir and at a flow rate selectable in accordance with the volume control signal such that the volume of liquid in the reservoir is maintained at a predetermined reference level. A temperature control network for adjusting the temperature of the replenishment liquid to a temperature that lies within a predetermined range of the temperature of the liquid in the reservoir may also be provided.