Nozzle Heater Control for Inkjet Printers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inkjet printing devices face issues with ink evaporation and drying in nozzles that are not in use, leading to ink loss and reduced print quality, especially when the substrate size is smaller than the printbar, resulting in unused nozzles being heated, which accelerates evaporation.
Innovation Solution
A controller system that selectively heats or cools printheads/nozzles based on their location relative to the print area, turning off heaters for unused nozzles to prevent evaporation and drying, while maintaining ink viscosity for printing by heating only the nozzles within the print area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heaters are activated for all nozzles to maintain ink viscosity, then printing performance is improved, but ink evaporation and drying in unused nozzles accelerates
Solution Approach 1:
The patent applies local quality by differentiating heater control between used and unused nozzles. Heaters are selectively activated only for nozzles within the print area while remaining inactive for nozzles outside the print area. This localized approach maintains ink viscosity where needed while preventing evaporation in unused nozzles, directly resolving the contradiction between printing performance and ink loss.
Solution Approach 2:
The patent segments the nozzle array into two distinct groups: nozzles within the print area and nozzles outside the print area. This segmentation enables independent control of heater activation for each group, allowing the system to optimize both printing performance (by heating active nozzles) and reduce ink evaporation (by not heating inactive nozzles).
2Productivity
If heaters are activated for all nozzles to maintain ink viscosity, then ink flow is improved, but energy consumption increases
Solution Approach 1:
The patent implements local quality by applying heat only where necessary - specifically to nozzles that are actively printing. This localized heating approach maintains proper ink viscosity and flow in used nozzles while avoiding unnecessary energy consumption from heating unused nozzles, thus resolving the contradiction between ink flow performance and energy efficiency.
Solution Approach 2:
The patent applies partial action by activating heaters for only a subset of nozzles (those within the print area) rather than all nozzles. This partial heating strategy provides sufficient ink flow control for active printing while significantly reducing overall energy consumption compared to universal heater activation.
3Adaptability or versatility
If substrate size is smaller than printbar, then printing flexibility is improved, but unused nozzles cause ink drying
Solution Approach 1:
The patent applies local quality by controlling heater activation based on the spatial relationship between the substrate and nozzle positions. When a substrate smaller than the printbar is used, heaters are activated only for nozzles that will contact the substrate while remaining inactive for nozzles that would otherwise cause ink drying. This resolves the contradiction by maintaining nozzle operability for used nozzles while preventing drying in unused nozzles.
Solution Approach 2:
The patent implements dynamic control of heater activation based on real-time printing conditions. The system adjusts which nozzles receive heating power according to the substrate dimensions and position, allowing flexible adaptation to different substrate sizes while preventing ink drying in nozzles that will not be used during the current printing operation.
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 solution extends the operational life of inkjet devices by preventing ink evaporation in unused nozzles, maintaining print quality, and optimizing ink usage by determining the print area based on substrate and image dimensions.
Implementation Method 1
heating (or not heating) printheads or nozzles based on a location of the printheads or nozzles and a print area for an image to be printed
Implementation Method 2
heated to decrease the viscosity of the ink for printing
Implementation Method 3
a cooling element may be activated to cool printheads or nozzles that are not in use
Implementation Method 4
heated ink within the nozzle may come into contact with air and start to evaporate, dry up and/or separate
Data Source
AI summary
Methods and apparatus to control a heater associated with a printing nozzle are disclosed. A method comprising controlling a heater associated with a printing nozzle to reduce a heat output of the heater based on a determination that the printing nozzle is outside a print area and printing an image on a substrate using other printing nozzles while the heat output of the heater is reduced.