Ink Supply Filter State Detection via Supply Valve Opening
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Solution Overview
Problem
Existing inkjet printing devices face challenges in efficiently determining the state of the filter unit in the ink supply system, particularly the coating state, which can lead to clogging and disrupt printing operations.
Innovation Solution
A device and method are employed to determine the state of the filter unit by measuring the opening degree of a supply valve while conveying ink with a defined target volumetric flow, using a series arrangement with the filter unit and supply valve, to assess the coating state based on the valve's opening degree.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the filter unit operates for extended periods to maximize useful life, then productivity is improved, but the filter unit becomes increasingly coated with contaminants leading to clogging and device downtime
Solution Approach 1:
The system performs preliminary detection of the filter unit's coating state by measuring the opening degree of the supply valve before complete clogging occurs. This allows proactive monitoring and prediction of filter degradation, enabling replacement to be scheduled before the filter fails and causes downtime.
Solution Approach 2:
The system continuously monitors the opening degree of the supply valve as an indicator of filter unit state. This feedback mechanism allows the system to track the progressive coating of the filter and predict when replacement will be necessary, balancing continuous operation with reliable functionality.
2Reliability
If the filter unit is replaced frequently to prevent clogging, then reliability is improved, but productivity decreases due to increased downtime for replacement
Solution Approach 1:
The system predicts the remaining useful life of the filter unit by analyzing the progression of the supply valve opening degree. This preliminary assessment allows replacement to be scheduled at the optimal moment - just before failure - rather than using fixed intervals that are either too frequent or too sparse.
Solution Approach 2:
The system uses the opening degree of the supply valve as a changing parameter that reflects the filter unit's degradation state. By monitoring this parameter's progression over time, the system can determine the precise moment when replacement is necessary, optimizing the balance between reliability and productivity.
3Quantity of substance
If the opening degree of the supply valve is increased to maintain ink flow through a coated filter, then ink supply is improved, but the filter unit clogs more quickly reducing its useful life
Solution Approach 1:
The system monitors the opening degree of the supply valve as feedback on the filter unit's coating state. By tracking how the valve opening must increase to maintain flow, the system can predict the rate of filter degradation and schedule replacement before complete clogging occurs, optimizing both ink supply and filter life.
Solution Approach 2:
The system uses the supply valve opening degree as a key parameter that changes in response to filter coating. This parameter serves as an indicator of the filter's remaining capacity, allowing the system to balance ink flow requirements with filter unit preservation by predicting when replacement will be necessary.
Data Source
AI summary
A device is described for determining the state of a filter unit of an ink supply system of a print bar of an inkjet printing device. The filter unit at a supply line to the print bar is arranged in series with a supply valve. The device is configured to determine an opening degree of the supply valve that thereby occurs while ink is conveyed with a defined target volumetric flow through the supply line. Furthermore, the device is configured to determine state information with respect to the state of the filter unit on the basis of the determined opening degree of the supply valve.