Autonomous Fluid Ejection Device Capping via Local Service Controller
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Solution Overview
Problem
In web presses and other fluid ejection systems, fluid ejection devices often remain uncapped during periods of inactivity, leading to fluid drying and subsequent print quality issues, and existing solutions fail to autonomously cap devices in cases of communication or power loss.
Innovation Solution
Local service controllers in the fluid ejection system are configured to autonomously detect failure conditions, such as power loss or communication disruptions, and initiate capping of fluid ejection devices using backup power and actuation mechanisms, ensuring the devices remain capped until the failure is resolved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fluid ejection devices remain uncapped during periods of inactivity, then ease of operation is improved, but fluid drying occurs leading to print quality degradation
Solution Approach 1:
The system performs capping action in advance during idle periods before fluid drying can occur, preventing quality degradation while maintaining operational readiness. The controller detects idle conditions and automatically caps the fluid ejection devices before harmful drying effects set in.
2Manufacturing precision
If automatic capping is implemented during normal operation, then print quality is maintained, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The fluid ejection system performs self-capping through automated control without requiring external intervention. The controller monitors system state and autonomously activates the capping mechanism, eliminating the need for manual operation while maintaining print quality.
Solution Approach 2:
The controller uses feedback from system state monitoring to determine when capping is required. By detecting idle conditions and fluid ejection device status, the system automatically initiates capping only when necessary, balancing quality maintenance with operational efficiency.
3Reliability
If backup power and autonomous capping capabilities are added, then reliability during failure conditions is improved, but device complexity and cost increase
Solution Approach 1:
The system prepares backup power sources and capping mechanisms in advance during normal operation. When power failure or communication loss occurs, the pre-positioned backup systems are already ready to activate, ensuring reliable capping without requiring complex real-time decision-making during failure conditions.
Data Source
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AI summary
In an example, an apparatus is described that a fluid ejection device to dispense fluid. A local service controller controls dispensing of the fluid by the fluid ejection device under a direction of a fluid ejection controller. The local service controller also initiates, autonomously of the fluid ejection controller, capping of the fluid ejection device in response to the detection of a failure condition by the local service controller. Capping mechanics are provided to cap the fluid ejection device under the direction of the local service controller.