Printer Nozzle Cleaning via Contact and Defect Detection
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Solution Overview
Problem
Existing printing apparatuses inefficiently manage nozzle clogging, leading to unnecessary cleaning operations and reduced printing efficiency due to unclear relationships between head-medium contact and nozzle clogging.
Innovation Solution
A printing apparatus equipped with an abnormal nozzle detection unit, contact detection unit, and ejection unit that executes ejection operations and complementary printing based on detected nozzle defects and contact status, optimizing cleaning and maintaining printing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cleaning is performed every time contact between head and medium is detected, then nozzle clogging is addressed, but printing efficiency is reduced due to unnecessary cleaning operations
Solution Approach 1:
The system uses feedback from the abnormal nozzle detection unit to determine whether cleaning is actually needed. Instead of cleaning on every contact detection, the system only triggers cleaning when abnormal nozzles are detected, creating a feedback-based conditional cleaning mechanism that avoids unnecessary operations while ensuring problem nozzles are addressed
Solution Approach 2:
The system performs partial cleaning actions only when necessary (when abnormal nozzles are detected) rather than excessive full cleaning operations on every contact event. This partial action approach applies cleaning only to the extent needed to maintain printing quality without over-cleaning
2Reliability
If cleaning is performed frequently, then nozzle clogging is prevented, but time is lost due to repeated cleaning interruptions
Solution Approach 1:
The control unit uses feedback from abnormal nozzle detection to intelligently determine when cleaning is necessary. The system monitors nozzle performance and only triggers cleaning when actual abnormalities are detected, preventing unnecessary time loss from frequent unnecessary cleaning operations while maintaining reliable nozzle discharge quality
Solution Approach 2:
The system performs self-diagnosis through the abnormal nozzle detection unit to identify when cleaning is actually needed. This self-service capability allows the system to autonomously determine the appropriate timing for cleaning operations, minimizing time loss while maintaining printing quality
Data Source
AI summary
A printing apparatus includes a head including a plurality of nozzles configured to discharge liquid to a medium, an abnormal nozzle detection unit configured to detect an abnormal nozzle having a discharging defect among the plurality of nozzles, a contact detection unit configured to detect contact between the head and the medium, a suction unit configured to perform an ejection operation of ejecting the liquid from the plurality of nozzles, and a control unit. The control unit executes a suction operation when the abnormal nozzle is detected and the contact between the head and the medium is detected, and the control unit executes a printing of complementing the abnormal nozzle when the abnormal nozzle is detected and the contact between the head and the medium is not detected.