Continuous Ink Supply Apparatus with Negative Pressure Regulation
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Solution Overview
Problem
Inkjet printers face limitations in usage rate and high intervention rates due to limited on-axis ink supplies, which can be addressed by implementing a continuous ink supply system that augments or replaces the on-axis supply without interrupting printer operations.
Innovation Solution
A continuous ink supply system that uses an off-axis ink supply connected to the printhead via a fluid conduit, featuring a one-way valve with a minimum negative activation pressure to prevent drooling and ensure uninterrupted ink delivery, along with a memory circuit for monitoring ink levels and types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an on-axis ink supply is used, then the printer structure is simple, but the ink reservoir is limited in capacity and requires frequent intervention
Solution Approach 1:
The patent introduces an off-axis ink supply positioned at a different spatial location than the printhead, connected via flexible conduits. This dimensional relocation allows the ink reservoir to be positioned away from the printing mechanism, enabling larger capacity without interfering with printhead movement and printing operations.
Solution Approach 2:
The patent employs flexible conduits as intermediary components to connect the off-axis ink supply to the printhead. These conduits act as mediators that transmit ink while accommodating the spatial separation between the ink reservoir and printhead, enabling continuous supply without direct mechanical connection.
2Productivity
If a continuous ink supply system is implemented, then ink delivery becomes continuous and print jobs can be larger, but drooling may occur due to pressure changes
Solution Approach 1:
The patent incorporates pressure sensors in the ink supply system that continuously monitor pressure changes and provide feedback to a control mechanism. This feedback loop enables real-time adjustment of pressure to maintain optimal ink flow while preventing drooling conditions.
Solution Approach 2:
The patent dynamically adjusts pressure parameters in the ink supply system based on operational conditions. By changing pressure levels in response to printing demands and environmental factors, the system maintains continuous ink delivery while preventing drooling through controlled pressure management.
3Quantity of substance
If an off-axis ink supply is added to augment on-axis supply, then ink availability increases, but air management and maintenance become more complex
Solution Approach 1:
The patent extracts the ink supply function from the printhead assembly by implementing a separate off-axis ink supply system. This extraction isolates the ink delivery mechanism from the printing mechanism, simplifying air management by separating the ink reservoir from the printing environment where air ingress could occur.
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 system allows for larger print jobs and extended service intervals of the printhead by maintaining a negative pressure in the ink supply, reducing drooling and enabling continuous printing without halting operations.
Implementation Method 1
maintaining a negative pressure in the ink supply, reducing drooling
Data Source
AI summary
Example continuous ink supply apparatus, systems and methods are disclosed. An example apparatus includes a housing; a printhead; and a regulator including a lever, a spring coupling the lever to the housing, a bladder, and a valve, a position of the lever relative to the housing being controlled by the bladder, the bladder being inflatable to urge the lever away from a surface of the housing and a plug of the valve to move away from a valve seat to enable fluid to flow through the aperture and into the housing, the regulator to enable a pressure within the housing to be maintained below a threshold pressure to substantially prevent fluid from inadvertently dispensing from the printhead.