Airflow Control System for Inkjet Carrier Plate
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Solution Overview
Problem
Inkjet printing systems using vacuum suction for media transport often experience image blurring due to air currents induced by the vacuum suction, particularly at the edges of the print media, leading to inaccurate and blurred printed images.
Innovation Solution
An airflow control system is implemented, which includes air supply units that direct air at an oblique angle under the printhead, selectively flowing makeup air to neutralize pressure gradients and reduce crossflows, thereby minimizing the impact of air currents on ink droplet placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If vacuum suction is used to hold print media against the movable support surface, then media transport stability is improved, but image quality deteriorates due to air currents causing blurring
Solution Approach 1:
The patent applies local quality by providing separate air supply units positioned at specific locations (upstream and downstream of the printhead) to address localized air current problems. Instead of uniformly treating the entire vacuum suction area, the system targets specific zones where air currents cause blurring, delivering controlled air flows only where needed to neutralize harmful crossflows while maintaining vacuum suction effectiveness.
Solution Approach 2:
The patent uses air supply units as intermediary elements between the vacuum suction system and the ink deposition process. These air supply units act as mediators that introduce controlled air flows to counteract the harmful air currents generated by vacuum suction, thereby protecting the ink droplet placement from blurring while allowing the vacuum system to continue functioning.
2Manufacturing precision
If air is supplied to neutralize vacuum-induced air currents, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the air supply function with the existing printhead assembly structure. The air supply units are integrated into the carrier plate or printhead housing, combining multiple functions (vacuum suction, air flow control, and ink deposition) within a unified structure. This integration reduces the need for separate external components and simplifies the overall system architecture.
Solution Approach 2:
The patent segments the air supply system into discrete, controllable units positioned at specific locations (upstream and downstream of the printhead). Each air supply unit can be independently controlled to provide targeted air flows, allowing the system to manage complexity through modular design where each segment performs a specific function and can be optimized separately.
3Manufacturing precision
If makeup air is supplied through the carrier plate opening, then crossflows are reduced, but air flow control precision must be maintained
Solution Approach 1:
The patent implements feedback control by using sensors to detect air flow conditions and vacuum suction effectiveness in real-time. The control system continuously monitors parameters such as air pressure, flow rate, and media position, adjusting the air supply units accordingly to maintain optimal conditions for preventing blurring while avoiding excessive air flows that could disrupt the printing process.
Solution Approach 2:
The patent applies dynamics by making the air supply system adjustable and responsive rather than static. The air supply units can dynamically change their operation based on real-time conditions, such as adjusting flow rates according to media type, printing speed, and vacuum suction strength. This dynamic control allows the system to adapt to varying conditions and maintain precision across different operating scenarios.
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
The airflow control system significantly reduces image blurring by ensuring that ink droplets are deposited accurately, maintaining image quality and precision while maintaining high printing speeds.
Implementation Method 1
the vacuum source creates a vacuum state in the vacuum plenum, causing vacuum suction through holes in the movable support surface that are fluidically coupled to the vacuum plenum
Implementation Method 2
the vacuum source creates a vacuum state in the vacuum plenum, causing vacuum suction through holes in the movable support surface
Implementation Method 3
an air supply unit arranged to flow air through the opening of the carrier plate between the carrier plate and the printhead
Implementation Method 4
flowing air at a direction aimed under the printhead and at an oblique angle relative to the movable support surface... to neutralize pressure gradients and reduce crossflows
Data Source
AI summary
A printing system comprises a print fluid deposition assembly, a media transport device, and an air flow control system. The print fluid deposition assembly comprises a carrier plate and a printhead to eject a print fluid through an opening of the carrier plate to a deposition region. The media transport device holds a print medium against the movable support surface by vacuum suction and transports the print medium through the deposition region. The air flow control system comprises an air supply unit comprising an airflow guide structure extending into the opening of the carrier plate, the airflow guide structure configured to flow air at a direction aimed under the printhead and at an oblique angle relative to the movable support surface. The air flow control system controls the air supply unit to selectively flow the air based on a location of a print medium relative to the printhead.