Repositionable Shutter Mechanism for Printhead Alignment
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Solution Overview
Problem
In high-speed inkjet printing, achieving consistent alignment and reduced spacing between printheads is challenging, leading to stitching variations and increased manufacturing costs, especially when accommodating wider print widths and maintaining effective maintenance operations.
Innovation Solution
A modular inkjet printhead assembly with a repositionable shutter mechanism, featuring a jetting module, ink catcher, and a compact shutter mechanism with an actuator and slide mechanism components, allowing for precise alignment and easy maintenance without the limitations of prior art.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed alignment structure is used to arrange printheads in an array, then alignment consistency is improved, but the spacing between nozzle arrays cannot be reduced and manufacturing cost increases for wider print widths
Solution Approach 1:
The patent makes the previously fixed alignment structure dynamic by introducing adjustable positioning mechanisms. The printhead mounting structure includes movable components that allow the spacing between nozzle arrays to be adjusted and optimized, transforming a static system into a dynamic one that can adapt to different spacing requirements while maintaining alignment precision.
Solution Approach 2:
The invention enables changing of the spacing parameter between nozzle arrays by providing an adjustable mounting structure. This allows the system to optimize the spacing value to reduce stitching variation while accommodating wider print widths, rather than being constrained by a fixed spacing determined during manufacturing.
2Area of stationary object
If the printhead array is designed for wide print width, then print width capability is improved, but manufacturing cost of the alignment baseplate increases significantly
Solution Approach 1:
The patent divides the printhead array into modular units that can be independently manufactured and then assembled. This segmentation allows each module to be produced at a standard size with consistent alignment features, and the overall wide print width is achieved by combining multiple modules rather than manufacturing one large custom baseplate, thereby reducing manufacturing cost.
Solution Approach 2:
The mounting structure is designed with universal alignment features that can accommodate different printhead configurations and print widths. The same basic mounting mechanism and alignment system can be used across various print width applications, eliminating the need for custom-designed baseplates for each width requirement and reducing overall manufacturing cost.
3Reliability
If traditional shutter mechanisms are used, then ink flow control is achieved, but the spacing between printhead rows is limited and maintenance operations are less effective
Solution Approach 1:
The patent extracts the shutter mechanism from its traditional fixed position and makes it independent and repositionable. The shutter is separated from the main printhead structure and can be independently adjusted and removed, allowing it to be positioned optimally without constraining the spacing between printhead rows and enabling better access for maintenance operations.
Solution Approach 2:
The shutter mechanism is transformed from a fixed, static component to a dynamic, repositionable one. It can be moved to different positions and completely removed from the printhead assembly, providing flexibility in spacing configuration and enabling effective maintenance operations while maintaining reliable ink flow control when needed.
Data Source
AI summary
An inkjet printhead assembly includes a repositionable shutter mechanism adapted to block a slot through which drops of ink ejected from the array of nozzles pass before they impinge on the print medium. The shutter mechanism includes a repositionable shutter blade extending in a cross-track direction having a pivot axis passing through first and second tabs affixed to its ends. A first slide mechanism component is pivotably attached to an end of an actuator rod, and a second slide mechanism component is rigidly attached to the repositionable shutter blade. An actuator is configured to translate the actuator rod, thereby pivoting the repositionable shutter blade about the pivot axis between a first pivot position where the shutter blade blocks the slot and a second pivot position where the shutter blade is moved away from the slot so that drops of ink can pass through the slot.