Transfer Roller Electrical Bias Control via Conductive Mediator
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Solution Overview
Problem
Existing imaging apparatuses face challenges in maintaining low electrical resistance of transfer rollers over time, leading to inefficiencies in toner transfer and image quality due to uneven distribution of ion conductive agents, which results in increased electrical resistance and reduced printing capacity.
Innovation Solution
The use of a conductive device with a lower electrical resistance than the transfer roller, which supplies electrical biases for imaging, cleaning, and resistance measurement, ensures even distribution of ion conductive agents, maintaining low electrical resistance and extending the life of the transfer roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transfer roller with ion conductive materials is used, then toner transfer efficiency is improved, but electrical resistance increases over time leading to reduced printing capacity
Solution Approach 1:
A conductive roller is introduced as an intermediary component that contacts the transfer roller to supply electrical bias. This mediator enables controlled current flow through the transfer roller, preventing ion migration and maintaining stable electrical resistance while preserving toner transfer efficiency
Solution Approach 2:
The electrical resistance of the transfer roller is controlled by adjusting the electrical bias supplied through the conductive roller. By changing the electrical parameters (voltage, current) applied to the transfer roller, the system maintains optimal resistance levels despite prolonged operation
2Productivity
If electrical bias is applied to the transfer roller, then toner transfer is improved, but uneven distribution of ion conductive agents causes resistance increase
Solution Approach 1:
The conductive roller serves as a mediator that distributes electrical bias uniformly across the transfer roller surface through direct contact. This uniform electrical distribution prevents uneven ion migration and maintains homogeneous distribution of ion conductive agents in the transfer roller material
Solution Approach 2:
The conductive roller creates an equipotential condition across the transfer roller by supplying electrical bias through extensive surface contact. This equalizes the electrical potential distribution, preventing localized ion accumulation and maintaining uniform material composition
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 effectively suppresses the increase in electrical resistance of the transfer roller, allowing for reliable and efficient printing of a large number of sheets without significant degradation in image quality.
Implementation Method 1
a conductive device with a lower electrical resistance than the transfer roller, which supplies electrical biases for imaging, cleaning, and resistance measurement
Implementation Method 2
The transfer roller forms a first nip between the transfer belt and the transfer roller, and a second nip between the transfer belt and the conductive device
Data Source
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AI summary
An imaging apparatus includes a transfer belt, a transfer roller, a conductive roller, and a power source. The transfer roller includes a metal shaft electrically floating during an imaging operation. The conductive device has an electrical resistance lower than an electrical resistance of the transfer roller. The power source is electrically connected to the conductive device, and the power source includes a first supply path to supply a first electrical bias to the conductive device during an imaging operation and a second supply path to supply a second electrical bias to the transfer roller during a cleaning operation.