Grounded Conductive Mesh for Inkjet Flushing

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Solution Overview

Problem

Ink jet printers face issues with ink droplet clogging and misting due to positive charge accumulation during the flushing process, leading to adverse effects on nozzle ejection during printing.

Innovation Solution

A liquid ejecting apparatus with a flushing receptive body featuring a conductive fixing member grounded to reduce repellence and misting, combined with a receiving member holding portion and mesh form portion to manage ink adhesion and misting effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If flushing is performed by ejecting ink droplets onto a flushing box, then nozzle clogging is suppressed, but ink droplet charging causes repellence and misting that adversely affects ejection quality

Engineering Contradiction:
Improvenozzle ejection reliabilityVSAvoidink droplet charging effects
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A conductive member is introduced as an intermediary between the ink droplets and the flushing box. This conductive member receives the charged ink droplets and provides a discharge path to ground, acting as a mediator that safely dissipates the electrical charge while still allowing the flushing operation to occur. The conductive member includes a mesh portion that faces the nozzle formation surface and a ground connection that extends to the ground side, creating a controlled path for charge dissipation.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrical conductivity parameter of the flushing box surface is changed by adding a conductive member with mesh structure and ground connection. This transforms the flushing box from a non-conductive surface that accumulates charge to a conductive surface that dissipates charge, fundamentally changing how charged ink droplets interact with the flushing box during operation.

Inventive Principle:
Principle #35Parameter changes

2Productivity

If the distance between nozzle surface and ink receiving surface is reduced to improve flushing efficiency, then misted ink droplets adhere to the nozzle surface, causing adverse effects on ejection

Engineering Contradiction:
Improveflushing operation efficiencyVSAvoidmisted ink droplet adhesion
Core Design Contradiction:
ProductivityVSObject-generated harmful factors

Solution Approach 1:

The conductive member with mesh portion serves as an intermediary surface between the nozzle and the flushing box interior. The mesh portion is positioned to face the nozzle formation surface and provide a charge dissipation path, while the three-dimensional space created by the mesh structure allows ink droplets to be received and discharged without requiring the nozzle to be in direct contact with the box interior, thus preventing misted droplet adhesion to the nozzle.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The conductive member is extended in the vertical direction to create a three-dimensional charge dissipation structure. This vertical extension creates spatial separation between the nozzle formation surface and the main body of the flushing box, allowing the system to maintain efficient flushing while preventing direct adhesion of misted droplets to the nozzle surface through the intervening conductive mesh structure.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

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 solution effectively reduces ink adhesion and misting on the nozzle surface, enhancing the reliability and quality of ink ejection by maintaining the conductive state of the fixing member and optimizing the distance and design of the receiving member holding portion.

Implementation Method 1

a fixing member with conductivity that fixes the receiving member to the receiving member holding portion by contacting the receiving member, and in the flushing operation, is positioned on the nozzle formation surface side due to the receiving member, and has a mesh form portion that forms an adhesion surface to which the ejected liquid is adhered with the receiving member, in which the fixing member is electrically grounded

Methodology Applied
Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

There is a tendency for the ink droplet which is ejected from the nozzle to have a strong positive charge during flight due to the Leonard effect

Methodology Applied
Scientific EffectLeonard effect: Lenard Effect

Implementation Method 3

has a mesh form portion that forms an adhesion surface to which the ejected liquid is adhered with the receiving member

Methodology Applied
Scientific EffectAdhesion: Adhesive

Data Source

PatentUS10093100B2Liquid ejecting apparatus with flushing receptive body for receiving liquid during maintenance operation
Publication Date: 2018.10.09 SEIKO EPSON CORP
  • US10093100B2 patent drawing
  • US10093100B2 patent drawing
  • US10093100B2 patent drawing

AI summary

A liquid ejecting apparatus includes a liquid ejecting portion which has a nozzle that ejects liquid, and a flushing receptive body which receives the liquid that is ejected in a flushing operation in which the liquid is ejected from the nozzle, the flushing receptive body including a receiving member that is able to receive the liquid, a receiving member holding portion which holds the receiving member, and a fixing member with conductivity that fixes the receiving member to the receiving member holding portion by contacting the receiving member and has a mesh form portion that forms an adhesion surface to which the ejected liquid is adhered with the receiving member in the flushing operation, in which the fixing member is electrically grounded.