Printhead Warming During Print Passes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inkjet printing fluids, such as water-based pigmented inks, are prone to 'decap' due to viscosity increase when exposed to air, leading to nozzle clogging and degradation of print quality, which existing technologies fail to effectively prevent without compromising image quality or increasing printer costs.
Innovation Solution
Warming the printhead to target temperatures during print passes, using a method that determines drive signals to maintain fluid fluidity and prevent decap without additional hardware or user burden, by utilizing heating units and temperature sensors to maintain optimal fluid viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the printhead is warmed during print passes, then decap time is extended and nozzle clogging is prevented, but energy consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the heating power and duration based on detected print conditions. The controller monitors print parameters and modifies the thermal parameters accordingly, warming the printhead only when necessary to extend decap time while minimizing energy consumption through condition-based activation.
Solution Approach 2:
The heating operation is made dynamic rather than static. The controller adjusts the heating duration and intensity based on real-time detection of print conditions, allowing the system to adapt the warming process to actual needs. This dynamic approach ensures reliability is maintained while avoiding unnecessary energy expenditure during low-risk printing scenarios.
2Manufacturing precision
If the printhead is warmed during print passes, then fluid viscosity is maintained and print quality is preserved, but printing speed may be reduced
Solution Approach 1:
The heating operation is performed in advance during the print pass before decap would occur. By proactively warming the printhead based on detected print conditions, the system prevents viscosity increase and potential nozzle clogging before they affect print quality, eliminating the need for corrective actions that would slow down printing.
Solution Approach 2:
The heating operation is integrated into the continuous print pass workflow rather than being a separate interruptive step. The controller seamlessly combines the warming function with the printing operation, maintaining continuous productivity while ensuring print quality through condition-based thermal management during the print process.
3Reliability
If heating units and temperature sensors are added to the printhead, then decap can be controlled, but device complexity and cost increase
Solution Approach 1:
The printhead system performs self-diagnosis and self-regulation regarding thermal management. The controller detects print conditions and autonomously determines when heating is required, then activates the heating units accordingly. This self-service approach enables decap control without requiring complex external monitoring systems or user intervention, keeping the added complexity minimal and integrated within the existing printhead architecture.
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
Effectively extends decap time, preventing nozzle clogging and maintaining print quality without additional costs or hardware, ensuring printhead longevity and efficient printing.
Implementation Method 1
warming the printhead to target temperatures during print passes, using a method that determines drive signals to maintain fluid fluidity
Implementation Method 2
utilizing heating units and temperature sensors to maintain optimal fluid viscosity
Data Source
AI summary
A drive signal may be determined to drive a printhead to a series of target temperatures during respective portions of a print pass by the printhead. Each of the target temperatures may be the greater of a temperature of the printhead caused by printing a quantity of printing fluid to be printed during the respective portion and a predetermined threshold temperature. A drive signal may be provided to warm the printhead to the series of target temperatures during the respective portions of the print pass.