Print Nozzle Maintenance with Wiping-Surface Test Patterns
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Solution Overview
Problem
Residual print fluid in nozzles of print heads can dry and cause nozzle blockages, leading to image quality defects and inefficiencies in printing processes.
Innovation Solution
A mechanism is implemented to check nozzle functionality by printing a test image on a wiping surface during the printing operation, using a sensor to analyze the pattern in real time, allowing for immediate detection and maintenance of defective nozzles without interrupting the printing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If residual ink is left in nozzles during printing, then printing efficiency is improved, but nozzles become blocked due to drying ink
Solution Approach 1:
The system performs preliminary detection of nozzle blockages by analyzing test patterns printed on the wiping surface before they affect actual printing quality. This allows maintenance to be performed proactively, preventing blocked nozzles from degrading print quality while maintaining continuous printing operations.
Solution Approach 2:
A dedicated wiping surface acts as an intermediary between the nozzles and the valuable printing media. Test patterns are printed on this intermediate surface for detection purposes, allowing nozzle functionality to be verified without consuming actual printing materials. The wiping surface also serves as a cleaning medium that contacts the nozzles to remove residual ink.
2Loss of time
If nozzle maintenance is performed during printing operations, then downtime is reduced, but detection accuracy may be compromised without proper testing mechanisms
Solution Approach 1:
The system implements a feedback mechanism where the imaging device captures test patterns printed by each nozzle, and the controller analyzes these patterns to determine nozzle functionality. This closed-loop feedback allows real-time detection and maintenance decisions to be made without interrupting the printing process, maintaining both accuracy and continuous operation.
Solution Approach 2:
Test patterns are printed on the wiping surface as a preliminary detection step before actual printing continues. This preliminary action allows the system to identify blocked nozzles in advance, schedule maintenance during natural pauses, and ensure printing quality is not compromised while minimizing overall downtime.
3Measurement precision
If test images are printed on valuable printing media for nozzle assessment, then nozzle functionality is detected, but printing media is wasted
Solution Approach 1:
A dedicated wiping surface serves as an intermediary medium for printing test patterns. This separate surface absorbs the function of nozzle testing, allowing accurate detection of nozzle functionality without consuming valuable printing media. The wiping surface is specifically designed for this maintenance function and can be replaced or cleaned independently of the printing process.
Solution Approach 2:
The wiping surface is treated as a disposable or easily replaceable component used specifically for nozzle testing. Rather than using durable, valuable printing media for test patterns, the system employs a cheaper, dedicated wiping surface that can be discarded or regenerated, eliminating waste of premium printing materials while maintaining detection accuracy.
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
Enables effective nozzle maintenance during ongoing printing operations, reducing downtime and waste by checking nozzle functionality without using valuable printing media, thus maintaining print quality and extending the life of the print head.
Implementation Method 1
A sensor is to scan the printed assessment pattern to determine whether print agent has been delivered from each nozzle of the plurality of nozzles in accordance with the intended pattern
Data Source
AI summary
A print apparatus is disclosed. The print apparatus comprises a print fluid application unit having a plurality of nozzles through which print fluid is to be deposited onto a printable medium during a printing operation. The print apparatus also comprises a nozzle cleaning surface to engage nozzles during a nozzle cleaning operation. The print apparatus also comprises a scanning unit and a controller. The controller is to control the print fluid application unit to deposit print fluid from nozzles of the plurality of nozzles according to an intended pattern onto the nozzle cleaning surface; control the scanning unit to scan the pattern formed on the nozzle cleaning surface; and responsive to determining, based on the scan, that print fluid from a nozzle of the plurality of nozzles has not been deposited according to the intended pattern, generate an instruction signal regarding maintenance of the print fluid application unit. A method and a machine-readable medium are also disclosed.