Inkjet Printhead Swap via Margin Pre-warming
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Solution Overview
Problem
Ink jet printers face downtime and inefficiencies due to faulty printheads, as replacing a defective printhead requires significant warm-up time and purge cycles, which can lead to intermittent issues and reduced printing quality.
Innovation Solution
A method for compensating faulty printheads by swapping them with functioning ones from the margin area, ensuring minimal downtime by using already warmed-up and calibrated printheads, and optimizing swap locations to maintain printing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a defective printhead is replaced with a new one, then printing quality is improved, but downtime increases due to warm-up time and purge cycles
Solution Approach 1:
The system pre-warms and pre-purges printheads before they are needed for printing. By maintaining printheads in a ready state in advance, the system eliminates the need for time-consuming warm-up and purge cycles when a printhead replacement is required, thus resolving the contradiction between printing quality and downtime.
Solution Approach 2:
The system changes the temperature parameter of printheads by implementing a warm-up process that gradually heats the printhead to operating temperature. This parameter change ensures the printhead is ready for immediate use without compromising print quality, while the pre-warming approach minimizes the time impact when replacements are needed.
2Loss of time
If printheads are kept in standby position, then replacement time is reduced, but printing width is limited
Solution Approach 1:
The printing system is segmented into multiple printhead positions, with at least one standby printhead positioned separately from the active printing position. This segmentation allows the system to maintain a ready-to-use replacement printhead without limiting the overall printing width capability, as the standby printhead can be quickly swapped into the active position when needed.
3Reliability
If purge cycles are performed after printhead replacement, then printing quality is improved, but productivity decreases
Solution Approach 1:
The system performs purge cycles in advance during the warm-up phase before the printhead is activated for printing. By completing the purge process beforehand, the system ensures printing quality is maintained while avoiding productivity loss during actual printing operations, as the printhead is already purged and ready for immediate use.
Data Source
AI summary
A system and method is provided for compensating for a faulty ink jet in a target printhead in an ink jet imaging system having a plurality of printheads arranged to span a maximum printing width that includes defining a typical printing width less than the maximum printing width and swapping the target printhead with a printhead situated in the margin outside the typical printing width. The system and method permits swapping the target printhead with a margin printhead that has a faulty ink jet provided that the location of the faulty ink jet in the margin printhead does not coincide or align with a faulty ink jet in printheads adjacent the target printhead.