Printer Carriage Assembly with Offset Independent Reservoirs
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Solution Overview
Problem
Manufacturers face challenges in effectively supplying ink or print fluid to printheads in shuttle-type printers, particularly in maintaining a reliable flow and preventing thickening or solidification due to evaporation.
Innovation Solution
The solution involves a carriage assembly with independent reservoirs mounted on the conveyance structure, which are offset from the row of jetting channels, creating differential pressure through acceleration and deceleration movements to facilitate the flow of print fluid to the printheads, and the use of manifolds and fluid ports to ensure continuous supply, even when the printer is not actively jetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single shared reservoir is used to supply ink to multiple printheads, then the device complexity is reduced, but the reliability of fluid supply deteriorates due to potential thickening and solidification from evaporation
Solution Approach 1:
The patent divides a single shared reservoir into multiple independent reservoirs, with each reservoir dedicated to supplying fluid to a specific printhead or group of printheads. This segmentation prevents fluid from remaining stagnant in a large shared reservoir, thereby reducing evaporation-related thickening and solidification while maintaining manageable device complexity
Solution Approach 2:
The patent introduces manifolds as intermediary components that distribute fluid from each independent reservoir to the corresponding printhead. These manifolds act as intermediaries that ensure continuous fluid flow and pressure regulation, preventing direct exposure of large fluid volumes to evaporation while maintaining reliable supply
2Productivity
If the carriage assembly moves rapidly to increase productivity, then the printing speed improves, but the fluid flow stability deteriorates due to acceleration and deceleration effects
Solution Approach 1:
The patent designs the fluid supply system to be dynamic, with independent reservoirs and manifolds that can adapt to the carriage assembly's motion. The system accommodates acceleration and deceleration by allowing each reservoir-manifold-printhead unit to respond independently to motion changes, maintaining fluid flow stability even during rapid productivity-oriented carriage movements
Solution Approach 2:
The patent utilizes changes in pressure and flow parameters during carriage acceleration and deceleration to maintain stable fluid delivery. By designing the manifold system to respond to these parameter changes, the patent ensures that fluid flow remains stable despite the dynamic motion required for high productivity
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 configuration ensures a consistent and reliable supply of print fluid to the printheads, preventing thickening and solidification by maintaining fluid circulation and pressure, thereby enhancing the printing process's efficiency and quality.
Implementation Method 1
creating differential pressure through acceleration and deceleration movements to facilitate the flow of print fluid to the printheads
Data Source
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AI summary
A carriage assembly for a printer that reciprocates along scan directions. The carriage assembly includes at least one printhead having a row of jetting channels for ejecting a print fluid, and reservoirs mounted on the carriage assembly that each supply the print fluid to the printhead. At least one of reservoirs is mounted on the carriage assembly to be offset from the row of jetting channels.