Staggered Printhead Assembly with Symmetrical Fluid Flow
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Solution Overview
Problem
Scaling inkjet print bars to accommodate wider media poses challenges in cost-effective manufacturing and high performance due to increased dimensional tolerances and stringent reliability requirements, particularly with the need for seamless fluid flow across notched ends in modular designs.
Innovation Solution
A modular print bar design featuring interchangeable printhead assembly modules with staggered printheads and a symmetrical fluid flow structure using slots and channels arranged across multiple plates, allowing for efficient fluid distribution and reduced dimensional tolerances, while maintaining reliability by limiting failures to individual narrower assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If print bars are scaled to accommodate wider media, then the printing width capability is improved, but the dimensional tolerances and manufacturing precision deteriorate
Solution Approach 1:
The patent divides the print bar into modular segments (chassis parts with notched ends) that can be manufactured separately with tighter tolerances and then assembled. Each module contains a subset of printheads and can be produced independently, allowing precision control in manufacturing while achieving overall wide printing capability through assembly of multiple modules.
2Area of stationary object
If print bars are scaled to accommodate wider media, then the printing width capability is improved, but the reliability deteriorates
Solution Approach 1:
The print bar is segmented into independent modules, each containing a subset of printheads. This modular architecture isolates failures to individual modules rather than affecting the entire system. The notched-end design enables selective replacement of malfunctioning modules while maintaining operation of other modules, thereby improving overall system reliability.
Solution Approach 2:
The patent enables easy replacement of defective modules through the notched-end design. When a module fails, it can be quickly removed and replaced with a new or refurbished module, minimizing downtime and maintaining system reliability without requiring replacement of the entire print bar.
3Adaptability or versatility
If notched ends are used to enable stacking of modules, then the modular assembly capability is improved, but the space for fluid flow routing deteriorates
Solution Approach 1:
The patent routes fluid flow in multiple dimensions and levels within the chassis structure. Rather than being constrained to a single plane, fluid channels are arranged in three-dimensional space, utilizing vertical stacking and lateral routing to accommodate the notched-end modular design while maintaining adequate fluid distribution to all printheads.
Data Source
AI summary
In one example, a printhead assembly module includes an upstream row of printheads and a downstream row of printheads and a flow structure to distribute printing fluids to the printheads. The upstream and downstream rows of printheads are offset from one another such that a printhead in the upstream row extends past the downstream row at one end of the module and a printhead in the downstream row extends past the upstream row at the other end of the module. The flow structure includes a plate, slots in the plate to carry printing fluid to the printheads, and corresponding channels in the plate to distribute printing fluid to the slots. The slots and channels are arranged on the plate such that the arrangement is the same when rotated 180° about an axis of symmetry located at the geometric center of the arrangement.