Fuser Roll Resistive Trace Segmentation for Uniform Heating

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Solution Overview

Problem

Current fuser designs for electrostatographic printing face issues with heat transfer efficiency and image quality due to cold spots caused by conductor interfaces and multiple tap designs, which affect the ability to handle different paper widths effectively.

Innovation Solution

A fuser roll with a single resistive heating trace and multiple tap-ins, featuring a conductive gap that separates current flow between segmented conductive traces, preventing lateral conduction and maintaining uniform heating across different media widths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple heating traces or multiple taps on one trace are used to handle different paper widths, then adaptability to different media widths is improved, but cold spots are created at conductor interfaces that reduce heater temperature locally and create radial cold areas in the fuser roll causing image quality issues

Engineering Contradiction:

Improveability to handle different paper widthsVSAvoidimage quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The heating trace is segmented into multiple independent sections along the process direction, with each section having its own conductor interfaces. This segmentation allows different sections to be activated based on paper width while isolating the conductor interface effects to specific locations rather than affecting the entire heating zone.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conductor interfaces are positioned at specific locations along the heating trace rather than being distributed throughout. By localizing the potential cold spot issues to specific interface locations and using segmentation to isolate them, the majority of the heating zone maintains uniform temperature quality suitable for good image production.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If multiple heating traces are used to handle different paper widths, then adaptability is improved, but heat transfer performance is hurt and only one heating trace can be in optimal position for heat transfer

Engineering Contradiction:

Improveability to handle different paper widthsVSAvoidheat transfer performance

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The heating trace is divided into multiple segments that can be independently activated. This allows the system to use a single continuous trace structure while activating only the necessary portions for the current paper width, maintaining optimal heat transfer through the trace-substrate contact while adapting to different media sizes.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If current center registered solid heaters with multiple tap designs are used, then adaptability to different media widths is improved, but device complexity increases requiring extra drawer connector pins and either serial control or perfect knowledge of media widths

Engineering Contradiction:

Improveability to handle different media widthsVSAvoidcontrol system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The heating trace is segmented into multiple sections that can be independently controlled. Each segment can be activated or deactivated based on the detected paper width, providing adaptability without requiring complex multi-tap switching mechanisms or serial control systems.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system automatically detects the paper width and activates the appropriate heating segments without requiring manual configuration or complex control logic. The segmentation allows the system to self-adjust to different media widths based on simple detection of the present paper size.

Inventive Principle:

Principle #25Self-service

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

This configuration enhances heat transfer uniformity and extends the life of the heater and fuser roll by preventing premature burnout and ensuring consistent image quality across various paper sizes.

Implementation Method 1

a heater element having a single resistive trace, a common trace tapped to a first side of the resistive trace continuous across the resistive trace, and first and second conductive traces tapped to ends of the resistive trace at a second side of the resistive trace opposite the first side

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS10336116B2Fuser for electrophotographic printing having resistive trace with gap

Publication Date: 2019.07.02 XEROX CORP

AI summary

A fuser includes a fuser roll and a pressure roll that forms a nip between the rolls through which a sheet is conveyed to permanently fuse an image onto the sheet. The fuser roll includes a heater element having a single resistive trace, a common trace tapped to a first side of the resistive trace continuous across the resistive trace, and first and second conductive traces tapped to ends of the resistive trace at a second side of the resistive trace opposite the first side. The first and second conductive traces are physically separated and conductively segmented by a conductive gap between the conductive traces. The resistive trace includes a separation gap extending through the resistive trace continuously from the second side of the resistive trace at the conductive gap towards the first side of the resistive trace to prevent current flow between the segmented conductive traces.