Tandem Opposed Inkjet Modules for Compact Print Zone Access
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Solution Overview
Problem
Existing inkjet printing systems face challenges in minimizing the print zone width, optimizing print quality, and simplifying printhead alignment and replacement processes while maintaining high-speed printing capabilities, particularly in digital inkjet presses with multiple redundancy in each ink color.
Innovation Solution
A printing unit with a pair of opposed inkjet modules mounted in tandem on a unit chassis, each with two rows of print chips butted end-on-end, aligned for redundant full-color printing, and featuring a compact design with adjustable printhead-paper-spacing and aerosol extraction for optimized airflow, minimizing print zone span and print artefacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple printheads are arranged along the media feed path for full-color printing with redundancy, then print quality and reliability are improved, but the span of the print zone along the media feed direction increases
Solution Approach 1:
The patent transitions from arranging printheads in a linear sequence along the media feed direction to stacking them in a three-dimensional configuration where multiple printheads are positioned at different heights and depths. This vertical and depth-based arrangement allows full-color printing with multiple redundancy while minimizing the horizontal span of the print zone, effectively moving the solution from one-dimensional to three-dimensional space utilization.
2Length of stationary object
If printheads are arranged in tandem configuration, then the print zone span is minimized, but access to printheads for replacement and maintenance becomes difficult
Solution Approach 1:
The patent divides the printing system into modular printhead assemblies that can be independently accessed and replaced. Each printhead is positioned in a separate accessible location within the tandem configuration, allowing maintenance personnel to reach individual printheads without disassembling the entire printing unit. This segmentation enables easy replacement while maintaining the compact tandem arrangement.
3Length of stationary object
If print chips are butted end-on-end to construct pagewide printhead, then the overall span of the print zone is reduced, but alignment precision requirements increase
Solution Approach 1:
The patent incorporates self-aligning features in the printhead design where the butted print chips include complementary mechanical elements such as tapered surfaces,定位 pins, or interference-fit interfaces. These features automatically align the print chips with each other during assembly, eliminating the need for high-precision manual alignment and reducing manufacturing complexity while maintaining the compact end-on-end configuration.
Data Source
AI summary
A printing unit includes a unit chassis with first and second opposed inkjet modules mounted in tandem on the unit chassis in forward and reverse orientations, each inkjet module having a respective printhead. The inkjet modules are each pivotally mounted on the unit chassis for pivotally moving them towards and away from each other. The printing unit is configured for printing only in a closed configuration in which the first and second inkjet modules have parallel opposed faces, and is configured for printhead replacement only in an open configuration in which the first and second inkjet modules have non-parallel opposed faces.