Printhead Priming Detection via Movable Member Response Time
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Solution Overview
Problem
Existing methods for priming inkjet printheads, such as using gas pumps or pressure sensors, are often inefficient, costly, and ineffective, leading to difficulties in ensuring the printhead is properly primed before printing, which can result in inadequate ink supply and delayed printing processes.
Innovation Solution
A system that identifies primed printheads by moving a movable member from a first position to a second position to cause ink flow and measures the response time, estimating pressure along the ink flow path, allowing for efficient and flexible priming without the need for costly pressure sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas pumps or pressure sensors are used to prime printheads, then priming function is achieved, but system cost and complexity increase
Solution Approach 1:
The patent removes the pressure sensor from the system and extracts only the essential priming function. Instead of using complex pressure sensing and control mechanisms, the invention uses a simple movable member that blocks the ink flow path to achieve priming through ink pressure buildup alone, eliminating unnecessary components.
Solution Approach 2:
The printhead system primes itself using its own ink supply pressure. The movable member simply blocks the flow path, allowing ink pressure to naturally build up and prime the system without requiring external gas pumps or active pressure control mechanisms. The system uses its inherent properties to achieve priming.
2Reliability
If gas pumps are used to prime printheads, then priming function is achieved, but operation time and efficiency increase
Solution Approach 1:
The patent skips the complex multi-step priming process used by gas pump systems. By simply blocking the ink flow path with the movable member, the system rapidly builds up ink pressure and achieves priming in a single straightforward action, significantly reducing priming time compared to gradual gas pressure buildup methods.
3Measurement precision
If pressure sensors are used to detect priming status, then accurate detection is achieved, but device cost and space increase
Solution Approach 1:
The patent replaces the electronic pressure sensing system with a simple mechanical indicator. The movable member's position itself indicates priming status - when it moves to block the flow path, priming is achieved. This mechanical indication eliminates the need for electronic sensors, signal processing, and associated complexity while maintaining detection functionality.
4Reliability
If gas pumps are used to prime printheads, then priming function is achieved, but energy consumption increases
Solution Approach 1:
The patent converts the potentially harmful effect of uncontrolled ink pressure into a beneficial priming mechanism. By blocking the flow path, the natural ink pressure builds up to the exact level needed for priming, transforming what could be a pressure control problem into a self-regulating priming solution that consumes minimal energy.
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 approach enables efficient and flexible priming of printheads, ensuring the printhead is properly primed by estimating pressure based on response time, reducing unnecessary operation and space-intensive components, and accommodating real-world variations in printhead priming.
Implementation Method 1
moving a movable member of a printhead from a first position to a second position to cause ink to flow from an ink supply into the printhead
Implementation Method 2
cause ink to flow from an ink supply into the printhead to prime the printhead
Data Source
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AI summary
Priming printheads can, in various examples, include moving a movable member of a printhead from a first position to a second position, measuring a response time of the movable member to move from the first position to the second position, and identifying the printhead as primed.