Metal Driving Roller Resin Layer for Image Forming Apparatus
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Solution Overview
Problem
The intermediate transfer method in image forming apparatuses faces challenges with color drift due to slip between the intermediate transfer belt and the driving roller, especially when using a metal roller, which is costly and inefficient, and restricts sensor positioning.
Innovation Solution
An image forming apparatus with a metal driving roller that applies a bias to secondary transfer units during primary transfer, enhancing slip allowance and reducing color drift, while allowing for cost-effective production and sensor placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber or rubber coating is used for the driving roller to prevent slip, then color drift is reduced, but manufacturing cost increases
Solution Approach 1:
The invention changes the surface parameters of the metal driving roller by forming a resin layer with specific friction characteristics (friction coefficient μ1) on its surface. This allows the metal roller to achieve slip prevention performance comparable to rubber rollers while maintaining the cost advantages of metal manufacturing.
2Ease of manufacture
If a metal roller is used as the driving roller to reduce cost, then manufacturing cost decreases, but slip occurs causing color drift
Solution Approach 1:
The invention creates a composite structure by forming a resin layer on the surface of the metal driving roller. The metal core provides structural integrity and cost efficiency, while the resin surface layer provides the necessary friction characteristics (μ1 ≥ μ2) to prevent slip and color drift.
3Reliability
If two spindles are used to support the intermediate transfer belt, then belt support is improved, but sensor positioning is restricted
Solution Approach 1:
The invention transitions from supporting the intermediate transfer belt at two discrete points (spindles) to continuous support along the entire circumference of the belt. This dimensional change in support distribution allows sensors to be positioned at optimal locations without being constrained by spindle positions.
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 color drift and allows for greater sensor positioning without increasing costs, even when using a metal roller, thereby improving the efficiency and cost-effectiveness of the image forming process.
Implementation Method 1
a driving roller that is one of the plurality of rollers, drives the intermediate transfer belt, and that also functions as an opposing unit with respect to the secondary transfer roller; where the driving roller is made of metal, and applies a bias to at least secondary transfer units, at least at a time of performing primary transfer to the image bearing bodies
Data Source
AI summary
In an image forming apparatus, an intermediate transfer belt is made of a resin film and is supported by a plurality of rollers. A driving roller that is one of the plurality of rollers, drives the intermediate transfer belt, and also functions as an opposing unit with respect to a secondary transfer roller. The driving roller is made of metal, and applies a bias to at least secondary transfer units, at least at a time of performing primary transfer to a plurality of image bearing bodies.