Print Bar Protective Flap for Nozzle Drying Prevention
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Solution Overview
Problem
Ink printing apparatuses face issues with low print utilization leading to nozzle downtime, resulting in ink drying and viscosity changes, which can cause blockages and require unnecessary cleaning cycles, especially in color printers where unused print heads are not utilized efficiently.
Innovation Solution
A print group design where print bars with print heads can be moved vertically into a park position and sealed with protective flap bars to prevent drying, allowing immediate reactivation and reducing wear and ink consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If printing takes place from all nozzles within a predetermined cycle to prevent drying, then nozzle reliability is improved, but ink consumption increases and print image quality deteriorates due to disruptions in unprinted regions
Solution Approach 1:
The print heads are divided into individually controllable nozzle groups, allowing selective activation of only those nozzles required for the current printing task. This segmentation enables the system to maintain nozzle reliability by periodically activating specific nozzle groups without requiring all nozzles to print, thereby avoiding unnecessary ink consumption and print image disruptions.
Solution Approach 2:
The system dynamically adjusts the printing cycle based on actual print utilization requirements. Instead of a fixed predetermined cycle for all nozzles, the control unit dynamically determines which nozzle groups need activation and when, optimizing the balance between preventing ink drying and avoiding unnecessary ink consumption and print disruptions.
2Reliability
If multiple cleaning cycles are performed to reactivate unused print heads, then nozzle reliability is improved, but productivity decreases and service costs increase
Solution Approach 1:
The system performs preliminary maintenance actions by periodically activating nozzle groups in a low-impact manner during normal operation, rather than waiting for complete drying that would require extensive cleaning cycles. This preliminary action prevents the need for multiple productivity-reducing cleaning cycles while maintaining print head reliability.
Solution Approach 2:
The print heads perform self-maintenance through periodic activation of nozzle groups, where the actuation of nozzles during normal printing operations simultaneously serves to prevent ink drying and maintain nozzle functionality. This self-service approach eliminates the need for separate cleaning cycles that would reduce productivity.
3Reliability
If protective caps are applied to seal nozzles during pauses, then prevention of ink drying is improved, but device complexity increases due to additional sealing mechanisms
Solution Approach 1:
A protective flap bar acts as an intermediary element between the printing substrate and the nozzles during pauses. This simple flap structure provides effective sealing without requiring complex protective cap mechanisms, reducing device complexity while maintaining reliable nozzle protection against ink drying.
4Reliability
If print bars are moved vertically into park position during pauses, then prevention of ink drying is improved, but device complexity increases due to additional movement mechanisms
Solution Approach 1:
The protective flap bar is integrated with the existing print bar structure, combining the protection function with the movement mechanism already present for positioning print bars. This merging approach provides effective nozzle protection during pauses without requiring separate complex movement mechanisms, thereby limiting the increase in device complexity.
Data Source
AI summary
In a print group for an ink printing apparatus, a housing is provided with print bars comprising print heads. The print bars are moveable independently of one another in a vertical direction from a printing position adjacent to a printing substrate into a park position and back. A protective flap bar for each print bar is provided which is pivotable and which is open to one side. The protective flap bar is arranged in a vertical position next to the print bar in the printing position such that the open side is facing away from the print bar. The protective flap bar is arranged in a horizontal position with the open side upward in the park position such that the print bar is engaged with its print head side in the protective flap bar.