Liquid Discharge Head Isolation for Conductive Mist Containment

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Solution Overview

Problem

Liquid mists generated during the discharge of pretreatment liquids in textile printers can contaminate components and cause electronic failures due to their high electrical conductivity.

Innovation Solution

A liquid discharge apparatus with isolators surrounding the liquid discharge heads and airflow generators to contain and collect mists, preventing them from reaching sensitive electronic components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pretreatment liquid is discharged using a liquid discharge head, then the liquid can be applied to fabric, but liquid mists are generated that can contaminate components and cause electronic failures

Engineering Contradiction:

Improveelectronic board reliabilityVSAvoidliquid mist generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

A shield member is introduced as an intermediary component between the liquid discharge head and the electronic board. This shield member physically blocks liquid mists generated during pretreatment liquid discharge from reaching the electronic board, thereby preventing contamination and electrical shorts while allowing the liquid discharge head to function normally

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The liquid discharge apparatus is segmented into distinct functional zones: a liquid discharge zone where the head operates, a shielded protection zone where the electronic board is isolated, and an airflow control zone with exhaust devices. This spatial segmentation allows each component to operate independently without interfering with others, particularly protecting the electronic board from liquid mist contamination

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If exhaust devices generate airflows to prevent liquid mist scattering, then contamination is reduced, but device complexity increases

Engineering Contradiction:

Improveliquid mist contaminationVSAvoidexhaust device complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Exhaust devices utilize pneumatic principles to generate controlled airflows that actively transport liquid mists away from the liquid discharge head and toward collection points. By using gas flow dynamics rather than mechanical barriers alone, the system effectively manages mist containment with relatively simple device structures

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The exhaust devices convert the potentially harmful scattered liquid mists into beneficial contained flows by directing them through controlled airflows toward collection points. What would otherwise be contamination becomes a controlled transport process, turning a harmful effect into a manageable and even useful function for maintaining system cleanliness

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12600152B2Liquid discharge apparatus

Publication Date: 2026.04.14 RICOH CO LTD

AI summary

A liquid discharge apparatus includes a liquid discharge head, an electronic board, circuitry, and an isolator. The liquid discharge head discharges liquid downward. The circuitry on the electronic board controls the liquid discharge head. The isolator is disposed between the liquid discharge head and the electronic board to isolate the liquid discharge head from the electronic board. The isolator includes a first isolator and a second isolator. The first isolator surrounds four lateral sides of the liquid discharge head. The second isolator contacts the first isolator and surrounds the four lateral sides above the liquid discharge head.