Printer Cartridge Multiple Backpressure Chambers Ink Distribution
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Solution Overview
Problem
Page wide printing systems face challenges with increased head pressure, air generation, and uneven ink distribution, leading to stranded ink and inefficient printing due to the design of existing backpressure chambers in printer cartridges.
Innovation Solution
A printer cartridge design featuring multiple backpressure chambers in fluid communication with a shared free fluid chamber, which accommodates higher head pressures and ensures even fluid distribution by regulating flow between the chambers, reducing the likelihood of stranded ink and uneven printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single backpressure chamber is used in a page wide printer cartridge, then the device complexity is reduced, but the ink distribution becomes uneven and stranded ink occurs due to increased head pressure
Solution Approach 1:
The single backpressure chamber is divided into multiple backpressure chambers (first, second, third chambers) that are distributed across the printhead assembly. Each chamber serves a specific region, ensuring uniform ink distribution and preventing stranded ink while maintaining manageable device complexity through modular segmentation.
2Area of stationary object
If the printer cartridge width is increased to match page width, then the printing coverage is improved, but the head pressure increases causing ink to pool and air to be pushed into the ink supply
Solution Approach 1:
The backpressure management is segmented into multiple chambers distributed across the wide printhead. This segmentation allows each region to independently manage its pressure, preventing the accumulation of excessive head pressure that would occur in a single-chamber design, thereby avoiding ink pooling and air intake while maintaining full page-width coverage.
3Stress or pressure
If foam is used to generate backpressure, then the backpressure is regulated, but smaller pore size foam reduces flow rates and filters out color pigment
Solution Approach 1:
Instead of using a single block of small-pore foam that would restrict flow, the system uses multiple distributed backpressure chambers. This segmentation allows for larger effective flow paths while maintaining backpressure regulation, preventing the flow rate reduction and pigment filtration issues associated with small-pore foam while still providing necessary backpressure control.
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 manages head pressures, reduces air intake, and ensures consistent ink delivery across the print medium, preventing stranded ink and improving printing efficiency and customer satisfaction.
Implementation Method 1
multiple backpressure chambers in fluid communication with a shared free fluid chamber, which accommodates higher head pressures and ensures even fluid distribution by regulating flow between the chambers
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
In one example in accordance with the present disclosure a printer cartridge is described. The printer cartridge includes multiple backpressure chambers in fluid communication with a shared free fluid chamber. The backpressure chambers are to supply a fluid to nozzles of a portion of a fluidic ejection assembly and to provide backpressure to the nozzles of the fluidic ejection assembly during deposition of fluid onto a print medium.