Manifold Seal Bead Blocker for Electrostatic Printers

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Solution Overview

Problem

Electrostatic printers often experience defects resulting in unintended or inconsistent marks, such as streaks, due to beads of toner escaping magnetic rolls and becoming stuck on donor rolls, leading to irregular toner distribution and printing artifacts.

Innovation Solution

A bead blocker and airflow combination manifold seal is introduced, which prevents beads from escaping and ensures consistent airflow, maintaining a uniform toner layer by creating a controlled gap between the magnetic and donor rolls, thereby reducing streaks and irregularities in the printing process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the manifold opening is left open to allow airflow, then air can flow through the manifold to move marking material, but beads of toner can escape the magnetic roll and reach the donor roll causing streaks and printing defects

Engineering Contradiction:

Improveairflow rateVSAvoidbead escape and streak formation

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The manifold seal is divided into multiple segments with individual openings, allowing airflow to pass through while each segment acts as a barrier to prevent bead escape. The segmented structure enables selective passage of air molecules while blocking larger toner beads.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The manifold seal acts as an intermediary component positioned between the magnetic roll and donor roll assembly. It mediates the airflow requirement while simultaneously serving as a barrier to prevent bead contamination, thus resolving the conflict between airflow and bead containment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the gap between the housing edge and magnetic roll is large to allow manufacturing tolerances, then assembly is easier, but airflow consistency deteriorates and bead control becomes poor

Engineering Contradiction:

Improveassembly toleranceVSAvoidairflow consistency

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The manifold seal functions as a thin film barrier that can be positioned precisely to control the gap between the housing edge and magnetic roll. This thin film structure maintains consistent airflow paths while allowing for manufacturing tolerances in the overall assembly, as the seal itself compensates for variations.

Inventive Principle:

Principle #30Flexible shells and thin films

3Object-affected harmful factors

If the seal completely covers the manifold opening to prevent bead escape, then bead containment improves, but airflow rate decreases

Engineering Contradiction:

Improvebead containmentVSAvoidairflow rate

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The manifold seal incorporates a porous structure with multiple small openings that allow air molecules to pass through while the overall structure maintains bead containment. The porous architecture provides sufficient airflow passages for air while the pore sizes are small enough to block toner beads, thus resolving the contradiction between containment and airflow.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

Instead of a single large opening, the seal is segmented into multiple smaller openings distributed across its surface. This segmentation allows cumulative airflow through many small passages while each individual segment maintains bead containment, achieving both airflow requirement and bead prevention.

Inventive Principle:

Principle #1Segmentation

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 blocks beads from reaching the donor rolls, maintaining a thin, uniform toner layer and consistent airflow, thereby minimizing streaks and improving print quality by reducing bead build-up and airflow discontinuities.

Implementation Method 1

an airflow device drawing air through passages of the manifold

Methodology Applied

Scientific EffectAirflow:

Implementation Method 2

The seal contacts such parallel surfaces to cover the manifold opening... the seal provides a smaller and more consistent gap with the magnetic roll than does the edge of the housing

Methodology Applied

Scientific EffectPhysical barrier blocking: Physical Containment

Implementation Method 3

one or more magnetic rolls in the housing that move marking material in the housing

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Implementation Method 4

one or more donor rolls in the housing that is positioned to receive the marking material from the magnetic roll

Methodology Applied

Scientific EffectContact transfer: Friction

Data Source

PatentUS10481525B1Development device manifold seal

Publication Date: 2019.11.19 XEROX CORP

AI summary

A development device includes components such as a housing, a magnetic roll in the housing that moves marking material in the housing, a donor roll in the housing that is positioned to receive the marking material from the magnetic roll, a manifold in the housing, etc. The manifold has a manifold opening positioned to create airflow from the surface of the donor roll. Further, such structures include a seal over the manifold opening. The seal is a component that has a planar linear surface with seal openings that are aligned with the manifold opening. The edge of the housing adjacent the manifold opening is a first distance from the magnetic roll and the edge of the seal is a second, closer distance from the magnetic roll.