Primary Transfer Roller Intrusion Layout for Cleaner Toner Transfer
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Solution Overview
Problem
Existing electrophotographic image forming apparatuses face issues with toner splashing and discharge craters due to the primary transfer roller being offset to the downstream side of the photoconductor drum, leading to inefficient toner transfer and potential mechanical damage.
Innovation Solution
The primary transfer roller is designed with a non-overlapping contact region with the photoconductor drum via the intermediate transfer belt, allowing the summit of the transfer roller to intrude onto the drum, enhancing transfer performance and mechanical stability by adjusting the offset and intrusion amounts within specific ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the primary transfer roller is offset to the downstream side of the photoconductor drum, then the toner transfer efficiency is improved, but toner splashing and discharge craters occur
Solution Approach 1:
The patent changes the geometric parameters of the system by defining specific relationships between the primary transfer roller and photoconductor drum: the contact regions are made non-overlapping and the summit intrusion amount is controlled within 0.01mm to 0.06mm. This parameter optimization allows the system to maintain improved toner transfer efficiency while eliminating toner splashing and discharge craters
2Productivity
If the primary transfer roller presses the intermediate transfer belt against the photoconductor drum, then the toner image transfer is enhanced, but mechanical wear and damage increase
Solution Approach 1:
The patent optimizes the pressure distribution parameters by controlling the summit intrusion amount within a specific range (0.01mm to 0.06mm) and ensuring non-overlapping contact regions. This creates an optimal pressure profile that enhances toner image transfer while minimizing mechanical stress and wear on the photoconductor drum and intermediate transfer belt, thereby extending their service life
3Productivity
If the summit of the primary transfer roller intrudes on the photoconductor drum, then the transfer performance is improved, but the risk of mechanical damage increases
Solution Approach 1:
The patent establishes an optimal intrusion parameter range (0.01mm to 0.06mm) that balances transfer performance and mechanical reliability. Within this range, the summit intrusion provides sufficient pressure for high-quality toner transfer while remaining small enough to prevent mechanical damage, thus simultaneously improving productivity and maintaining reliability
Solution Approach 2:
The patent creates a dynamic pressure distribution through the controlled summit intrusion, where the pressure is concentrated at the summit point rather than distributed across a large contact area. This dynamic pressure profile enhances transfer performance at the critical transfer zone while limiting overall mechanical stress on the components
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 improves image quality by reducing banding and drum ghosting while prolonging the mechanical service life of the photoconductor drum and intermediate transfer belt.
Implementation Method 1
The primary transfer roller is opposed to the photoconductor drum via the intermediate transfer belt, and presses the intermediate transfer belt against the photoconductor drum, thereby transferring the toner image on the photoconductor drum, to the intermediate transfer belt from the photoconductor drum
Implementation Method 2
The photoconductor drum carries an electrostatic latent image, which is developed into a toner image by application of toner
Data Source
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AI summary
An image forming apparatus (1) includes a photoconductor drum (4), an intermediate transfer belt (5) that moves in contact with the photoconductor drum (4), and a primary transfer roller (31) which is a metal roller. A first contact region (4S), being a region on the photoconductor drum (4) in contact with the intermediate transfer belt (5), and a second contact region (1S), being a region on the primary transfer roller (31) in contact with the intermediate transfer belt (5), are spaced from each other, and a summit of the primary transfer roller (31), protruding farthest toward the photoconductor drum (4), in a direction in which the photoconductor drum (4) and the primary transfer roller (31) are aligned across the intermediate transfer belt (5), is set to intrude on the photoconductor drum (4), via the intermediate transfer belt (5).