Liquid Discharge Head Flushing Pattern Detection for Defective Nozzles
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Solution Overview
Problem
Existing liquid discharge apparatuses struggle to efficiently identify defective nozzles in a liquid discharge head, leading to inconsistent printing quality and ink wastage.
Innovation Solution
The apparatus incorporates a liquid discharge head with multiple nozzles, a circuitry system, and image detectors to form flushing patterns at the leading and trailing ends of the recording medium, allowing for the detection of defective nozzles by reading these patterns and identifying them based on pixel values exceeding a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flushing operations are performed frequently to discharge thickened ink, then nozzle reliability is improved, but ink consumption increases
Solution Approach 1:
The system performs preliminary detection of nozzle status by reading flushing patterns before conducting full flushing operations. This allows the apparatus to identify defective nozzles in advance and perform targeted flushing only when necessary, rather than performing frequent blanket flushing operations on all nozzles.
Solution Approach 2:
The image detector provides feedback information about the flushing pattern quality, which the control unit uses to determine whether flushing operations are actually needed. This feedback mechanism enables the system to adjust flushing frequency based on actual nozzle performance, avoiding unnecessary flushing that would waste ink.
2Manufacturing precision
If flushing operations are performed frequently to maintain printing quality, then printing quality consistency is improved, but productivity decreases
Solution Approach 1:
The system performs preliminary detection of nozzle status by reading flushing patterns before conducting full flushing operations. This allows the apparatus to identify defective nozzles in advance and perform targeted flushing only when necessary, rather than performing frequent blanket flushing operations that reduce productivity.
Solution Approach 2:
The image detector provides feedback information about the flushing pattern quality, which the control unit uses to determine whether flushing operations are actually needed. This feedback mechanism enables the system to maintain printing quality consistency by performing flushing only when defective nozzles are detected, rather than following a fixed frequent schedule that would reduce productivity.
3Device complexity
If defective nozzles are not identified, then device complexity is reduced, but ink wastage increases
Solution Approach 1:
The system uses the existing image detector, which is already part of the printing apparatus, to read and analyze flushing patterns for defective nozzle detection. This self-service approach allows the system to identify defective nozzles using existing components without adding complex external detection devices, thereby minimizing device complexity while preventing ink wastage.
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 method effectively identifies defective nozzles, reduces ink consumption, and ensures consistent printing quality by minimizing unnecessary flushing operations, thereby optimizing the printing process.
Implementation Method 1
an image detector to read the flushing pattern on the recording medium
Implementation Method 2
an image detector to read the flushing pattern on the recording medium
Data Source
AI summary
A liquid discharge apparatus includes a liquid discharge head, circuitry, and an image detector. The liquid discharge head includes multiple nozzles and discharges a liquid from the multiple nozzles. The circuitry causes the liquid discharge head to discharge the liquid onto a recording medium to form an image in an image area of the recording medium in a printing operation. The image detector reads the image formed on the recording medium. The circuitry further causes the liquid discharge head to discharge the liquid onto at least one of a leading end or a trailing end of the recording medium to form a flushing pattern different from the image in a flushing operation, causes the image detector to read the flushing pattern, detect a defective part in the flushing pattern read by the image detector, and identify a defective nozzle among the multiple nozzles based on defective part.