Ink Supply System With Direct Return Line
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Solution Overview
Problem
Existing ink supply systems for inkjet printers require complex setups with multiple components and pressure generators, leading to inefficiencies in ink circulation and cleaning, which can result in dirt accumulation and reduced print quality.
Innovation Solution
A simplified ink supply system with direct circulation between the return tank and supply tank, allowing for intermittent reverse flow during printing and cleaning, and a modular design for adaptable print heads that reduces the need for multiple lines and pressure generators, enabling better control over ink flow and reduced contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex ink supply system with multiple tanks, filters, and pressure generators is used, then ink circulation and cleaning functions are provided, but the device complexity increases and requires multiple pressure generators
Solution Approach 1:
The patent combines the supply tank and return tank into a single integrated tank structure, eliminating the need for separate supply and return tanks. The ink circulation path is designed to flow directly from the print head through the return line back to the same tank, simplifying the overall system architecture while maintaining ink circulation and cleaning functions.
Solution Approach 2:
The single tank serves multiple functions: it acts as both the supply tank and return tank, providing ink to the print head and receiving returned ink for circulation. This multi-functional design eliminates the need for separate supply and return tanks, reducing system complexity while maintaining all necessary ink circulation and cleaning capabilities.
2Adaptability or versatility
If multiple connecting lines and pressure generators are provided for ink supply and cleaning, then ink can be supplied to multiple print heads, but the device complexity and number of components increase
Solution Approach 1:
The patent divides the ink supply system into modular components where each print head can be independently connected to the single tank through separate return lines. This segmentation allows multiple print heads to be supported while maintaining a simplified central tank structure, reducing the need for multiple pressure generators and complex interconnections.
Solution Approach 2:
The system uses the ink flow itself to perform cleaning functions during normal operation. Ink continuously circulates from the tank through the print heads and back, automatically flushing the lines and preventing dirt accumulation without requiring separate cleaning mechanisms or additional pressure generators.
3Stability of the object's composition
If ink flows continuously through the circuit, then ink circulation is maintained, but dirt and sedimentation can accumulate in the lines and tanks
Solution Approach 1:
The patent implements periodic reverse flow cycles where the ink flow direction is temporarily reversed to flush accumulated dirt and sediment back toward the tank. This periodic action prevents continuous buildup in the lines while maintaining overall ink circulation, combining the benefits of continuous flow with periodic cleaning.
Solution Approach 2:
The system converts the potentially harmful effect of continuous ink flow (which can cause sedimentation) into a benefit by using the same flowing ink to perform cleaning functions. The continuous circulation keeps ink fresh and prevents stagnation, while periodic reverse flow uses this moving ink to flush out accumulated contaminants, turning a potential problem into a self-cleaning mechanism.
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
This solution allows for precise control of pressure at the print heads, reduces dirt accumulation, and enhances print quality by maintaining constant ink circulation and temperature, while also enabling the system to be adaptable to various media formats and process media.
Implementation Method 1
During the printing operation, a pressure difference is built up in the interior between the interior of the supply tank and the interior of the return tank by a means, for example a vacuum generator, so that the ink is conveyed from the supply tank through the print heads to the return tank due to this difference in pressure.
Implementation Method 2
An intermediate container containing a larger supply of ink is connected to the supply tank by means of a line with an interconnected filter arrangement.
Data Source
AI summary
The invention relates to an ink supply system (2) for an inkjet printer (1) as well as a method of operating the ink supply system and an inkjet printer. The inkjet printer comprises a print head arrangement (6) incorporating several print heads (7) with one or more nozzles (8) for at least one color. The print heads (7) are connected via connecting lines (19) to a supply tank (187) connected via a filling line to an intermediate tank (12) with a conveyor means (16) and a filter arrangement (18) connected in between, and connected separately in each case via second connecting lines (21) to a common return tank (22). Means (32) are provided by means of which a pressure difference can be maintained in the supply tank (17) and/or in the return tank (22) as and when necessary to control a flow of ink from the supply tank (17) via the flow passages (20) of the print heads (7) connected in parallel to the return tank (22). The return tank (22) is directly connected to the supply tank (17) via a return line (24), optionally with a conveyor means (25) connected in between.