Transporter Decoupler for Inkjet Print Media Holding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inkjet printers face inaccuracies in print image positioning and increased power consumption due to air flows between recording media on transport belts, leading to ink droplet deflection and nozzle drying.
Innovation Solution
A transporter system with a decoupler mechanism that selectively suppresses negative pressure through holes on the transport belt not covered by recording media, preventing air flows and maintaining ink flow only when media is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If negative pressure is continuously applied through all holes on the transport belt, then recording media can be reliably held on the transport belt, but air flows are generated in gaps between recording media causing ink droplet deflection and increased power consumption
Solution Approach 1:
The negative pressure application is segmented into two independent systems: one for holding recording media (when holes are covered) and another for preventing air flows in gaps (when holes are uncovered). This segmentation allows selective activation of negative pressure in different spatial and temporal contexts, resolving the contradiction between reliable media holding and energy efficiency.
Solution Approach 2:
The first negative pressure is applied in advance to hold the recording medium on the transport belt before printing occurs. This preliminary action ensures the medium is securely positioned, while the second negative pressure is then activated specifically for uncovered holes to prevent air flows during gaps, avoiding energy waste while maintaining holding reliability.
2Manufacturing precision
If negative pressure is applied through uncovered holes in gaps between recording media, then air consumption increases, but this prevents ink droplet deflection and maintains print quality
Solution Approach 1:
A decoupling mechanism acts as an intermediary between the negative pressure source and the transport belt holes. This intermediary selectively connects or disconnects specific holes from the negative pressure source based on whether they are covered by recording media or represent gaps, thereby controlling air consumption while maintaining print precision through selective air flow prevention.
Solution Approach 2:
The system dynamically adjusts the application of negative pressure based on real-time conditions - specifically whether holes are covered by recording media or represent gaps. The negative pressure application transitions from a static continuous state to a dynamic selective state, activating pressure only where needed to prevent air flows during gaps while consuming minimal air.
3Manufacturing precision
If high negative pressure is continuously applied to prevent air flows, then ink droplet deflection is prevented, but ink may be sucked out of nozzles and nozzle drying occurs
Solution Approach 1:
The negative pressure application follows a periodic pattern synchronized with the transport cycle: first negative pressure is applied during media presence for holding, then second negative pressure is applied periodically during gaps for air flow prevention. This periodic action prevents continuous high pressure that would cause ink suction, while still achieving the necessary air flow control for print precision.
Solution Approach 2:
The negative pressure application is localized to specific holes based on their coverage status. Uncovered holes in gap regions receive second negative pressure to prevent air flows, while covered holes receive only first negative pressure for holding. This local differentiation prevents excessive pressure from being applied universally, thereby avoiding ink suction and nozzle drying while maintaining print accuracy where needed.
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
Enhances print quality by preventing ink droplet deflection and reducing power consumption by minimizing air flow and maintaining ink flow only when necessary, thus protecting print heads from drying.
Implementation Method 1
The negative pressure may be produced by a negative pressure pump
Implementation Method 2
The decoupler may thereby be configured to seal off a portion or all of the holes of the transport belt
Data Source
AI summary
A transporter can transports a recording medium on a transport belt through a print group with at least one print head. The transport belt has a plurality of holes via which a negative pressure may be produced to draw/hold a recording medium onto the transport belt. To avoid an air flow below the print head, a decoupler can selectively cover, seal, and/or decouple a source of the negative pressure such that no negative pressure is produced through the holes that are located below the print head and that are not covered by a recording medium.