Compact Printing Unit Layout With Integrated Aerosol Extraction

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Solution Overview

Problem

Existing inkjet printers face challenges in integrating compact, full-color printing units with efficient aerosol extraction systems while maintaining a minimal footprint, particularly in high-speed thermal inkjet systems with small drop sizes, to prevent print quality loss and contamination.

Innovation Solution

A printing unit design featuring a fixed maintenance chassis with integrated aerosol extraction units, comprising aerosol extractors extending across the media feed path, and a lift mechanism for printhead modules, allowing compact configuration and efficient aerosol removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a compact printing unit configuration is implemented, then the footprint is minimized, but aerosol extraction efficiency may be compromised

Engineering Contradiction:

ImprovefootprintVSAvoidaerosol extraction efficiency

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The aerosol extractors are positioned underneath the bottom plate, utilizing the vertical dimension rather than horizontal space. This allows aerosol extraction functionality to be integrated into the compact footprint by extracting aerosols from below the media path, effectively using three-dimensional space optimization.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The aerosol extractors are nested within the structural framework of the printing unit, with the extractors integrated into the space between the bottom plate and the media path. This nesting approach allows multiple functions (printing and aerosol extraction) to coexist in a compact configuration.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Area of stationary object

If multiple print modules are integrated in a compact arrangement, then the footprint is reduced, but device complexity increases

Engineering Contradiction:

ImprovefootprintVSAvoidintegration complexity

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The printing unit is divided into modular print modules that can be independently positioned and maintained. Each print module has its own aerosol extractor, allowing for standardized, repeatable integration patterns that reduce overall system complexity despite having multiple modules.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bottom plate serves multiple functions: it provides structural support, defines maintenance access slots, and supports the aerosol extraction system. This multi-functionality reduces the number of separate components needed, thereby reducing overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If aerosol extractors are positioned close to printheads, then extraction efficiency improves, but maintenance access becomes difficult

Engineering Contradiction:

Improveaerosol extraction efficiencyVSAvoidmaintenance access

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The aerosol extractors are extracted from the traditional position above or beside the printheads and relocated to underneath the bottom plate. This extraction allows maintenance personnel to access printheads through slots in the bottom plate without interfering with the aerosol extraction system, which operates independently from below.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The bottom plate acts as an intermediary structure that separates the maintenance access path (through slots in the bottom plate) from the aerosol extraction path (underneath the bottom plate). This intermediary structure allows both maintenance and aerosol extraction to occur simultaneously without interference.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design achieves a compact footprint with efficient aerosol extraction for multiple printheads, facilitating integration into existing systems and maintaining print quality by effectively removing ink mist.

Implementation Method 1

an air knife having a knife slot for directing a flow of air towards print media

Methodology Applied

Scientific EffectAir flow:

Implementation Method 2

to disrupt aerosol trapped in a boundary layer associated with moving media

Methodology Applied

Scientific EffectBoundary layer disruption: Boundary Layer

Implementation Method 3

a suction nozzle positioned upstream of the knife slot for directing aerosol into a suction channel

Methodology Applied

Scientific EffectSuction: Suction

Data Source

PatentEP4594106B1Compact printing unit with integrated aerosol extraction unit

Publication Date: 2026.01.14 MEMJET TECH LTD

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Figure 5~6

AI summary

A printing unit (1) includes: a fixed maintenance chassis (9) having a bottom plate defining a plurality of first slots; print modules (30) having a respective inkjet printheads extending across a media feed path; a lift mechanism for lifting and lowering the print modules relative to the media feed path; and an aerosol extraction unit mounted to an underside of the bottom plate. The aerosol extraction unit includes a plurality of aerosol extractors, which extend across the media feed path between a pair of side bars, the aerosol extractors being spaced apart along the media feed direction to define a corresponding plurality of second slots aligned with the first slots. Each print module is slidably movable through its respective first and second slots towards the media feed path into a printing position.