Tandem Opposed Inkjet Modules for Compact Four-Color Printing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inkjet printing systems face challenges in minimizing the print zone width, optimizing print quality, and reducing setup costs while allowing for flexible printhead alignment and replacement, particularly in high-speed digital inkjet presses.
Innovation Solution
A printing unit with a pair of opposed inkjet modules mounted in tandem on a chassis, each with two rows of print chips butted end-on-end, aligned for four-color printing, and featuring a compact design with redundant nozzle rows to minimize print zone span and enhance print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple printheads are arranged along the media feed path for full-color printing, then full-color printing capability is achieved, 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 a two-dimensional configuration where printheads are positioned side-by-side in opposition. This dimensional change allows all printheads to operate within a compact span along the feed direction while maintaining full-color printing capability through the opposed arrangement.
Solution Approach 2:
The opposed printhead configuration enables a nested-like arrangement where print zones are stacked or positioned in opposition, effectively utilizing space in a compact manner. This reduces the overall span required along the media feed direction compared to a linear expansion of printhead arrangement.
2Manufacturing precision
If printheads are precisely aligned for high-quality printing, then print quality is optimized, but setup complexity and alignment costs increase
Solution Approach 1:
The printing system is divided into independent opposed printhead modules that can be individually positioned and aligned. This segmentation allows for simplified alignment procedures compared to a fully integrated system, as each module can be calibrated separately while maintaining overall print quality.
Solution Approach 2:
The opposed printhead configuration enables self-alignment mechanisms where the symmetry and opposition of the arrangement facilitate automatic or simplified alignment during installation, reducing the need for complex manual calibration procedures.
3Reliability
If redundant nozzle rows are implemented, then print quality and reliability are improved, but device complexity increases
Solution Approach 1:
Multiple nozzle rows are merged into a single integrated printhead structure, allowing redundant nozzles to be combined in a compact arrangement. This merging maintains reliability through redundancy while reducing the overall complexity compared to separate printhead assemblies.
Solution Approach 2:
The redundant nozzle rows serve multiple functions: primary printing, backup for malfunctioning nozzles, and quality enhancement through multiple passes. This multi-functionality justifies the added complexity by providing enhanced reliability and print quality from a single integrated structure.
Data Source
AI summary
A printing unit includes: a unit chassis and a pair of opposed inkjet modules mounted in tandem on the unit chassis in forward and reverse orientations, each inkjet module having one respective printhead and at least one of: a capper and a wiper. Each printhead includes first and second rows of print chips mounted on a unitary surface of a respective ink manifold, the first and second rows of print chips having a plurality of print chips butted end-on-end along a length of the printhead. The printheads are wholly aligned with respect to a media feed direction for printing in four ink colors from the pair of printheads.