Overlapping Print Head Layout for Wide-Substrate Diagonal Printing
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Solution Overview
Problem
Current print head modules for wide substrates face challenges in achieving continuous, high-speed, and uniform deposition due to limitations in flexibility, redundancy, and maintenance, particularly in scan and step systems, which result in inefficient use of print heads and potential mechanical failures.
Innovation Solution
A print head module with staggered and offset print heads forming an elongate compound head that overlaps along the transport axis, allowing for nozzle redundancy and efficient deposition at different swathe angles, eliminating the need for alignment and synchronization between carriages, and reducing calibration requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a fixed array of print heads is used to cover wide substrates, then the substrate width coverage is improved, but the system cost and complexity increase significantly
Solution Approach 1:
The print head array is divided into multiple modular print head carriages that can be independently positioned and controlled. Each carriage contains a manageable number of print heads, allowing the system to cover wide substrates without requiring a single complex fixed array. The carriages can be staggered and offset to form an elongate compound head configuration.
Solution Approach 2:
The system transitions from a static fixed array to a dynamic configuration where print head carriages can be moved, positioned, and staggered along the transport axis. This dynamic arrangement allows flexible coverage of wide substrates while maintaining manageable system complexity through controlled movement and positioning of modular units.
2Reliability
If print heads are staggered and offset to form an elongate compound head, then nozzle redundancy and deposition uniformity are improved, but the device complexity increases
Solution Approach 1:
The print head carriages are arranged in an asymmetric staggered and offset configuration rather than a symmetric grid. This asymmetric arrangement creates overlapping nozzle patterns that provide redundancy while maintaining uniform deposition. The first and second carriages are positioned at different offsets along the traverse axis, creating a compound head effect without requiring complex symmetric coordination.
Solution Approach 2:
The system adds spatial dimensionality to the print head arrangement by staggering carriages along the transport axis and offsetting them along the traverse axis. This two-dimensional staggering creates overlapping deposition zones that provide nozzle redundancy and uniformity without requiring a dense single-plane array, thereby managing complexity through spatial distribution.
3Area of stationary object
If scan and step arrangements are used for wide substrates, then the substrate width coverage is improved, but the production speed and continuity are reduced
Solution Approach 1:
The staggered and offset print head carriages enable continuous diagonal printing across wide substrates without requiring stop-and-step operations. The overlapping nozzle arrangements from multiple carriages allow uninterrupted deposition as the substrate moves continuously through the printing system, eliminating the productivity losses associated with scan and step arrangements.
Solution Approach 2:
The print head carriages are pre-positioned in staggered and offset configurations before printing begins. This preliminary arrangement ensures that nozzles from different carriages are already aligned to create continuous diagonal swathes, eliminating the need for real-time positioning adjustments during printing and maintaining continuous high-speed operation.
4Area of stationary object
If a large number of print heads are used to cover wide substrates, then the substrate width coverage is improved, but the maintenance complexity and downtime increase
Solution Approach 1:
The print head system is segmented into multiple independent carriages that can be maintained separately. Each carriage contains a manageable subset of print heads that can be serviced without affecting the entire system. This segmentation allows maintenance personnel to work on individual carriages during operation, reducing overall maintenance downtime and complexity compared to maintaining a single large fixed array.
Solution Approach 2:
The dynamic, movable carriage configuration allows print heads to be accessed and maintained more easily than in a fixed array. Carriages can be moved away from the substrate path for maintenance without requiring the entire system to stop or the substrate to be repositioned, facilitating quicker and easier repair operations while maintaining wide substrate coverage.
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 enables efficient diagonal printing across wide substrates with uniform coverage, reduced calibration needs, and improved reliability, allowing for continuous operation at high speeds with minimal mechanical inaccuracies and maintenance interruptions.
Implementation Method 1
first and second print heads having nozzles for depositing the substance
Data Source
AI summary
A print head module (20) for depositing a substance has an axis and a plurality of print heads (22) provided with nozzles (23). The heads are distributed along the axis to form an elongate compound head having nozzle redundancy by arranging the heads in partially overlapping relation to one another. This allows deposition of the substance from the nozzles in uniform swathes having different angles transverse to the axis.