Cleaning Bias Controller for Toner Transfer Efficiency
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Solution Overview
Problem
Current image forming apparatuses face challenges in efficiently transferring and cleaning toner images due to variations in toner amount and environmental conditions, leading to inconsistent image quality and reduced cleaning efficiency.
Innovation Solution
The apparatus incorporates a transfer-toner-amount estimating unit and a cleaning-bias controller to adjust the cleaning bias voltage based on the estimated toner amount, ensuring optimal transfer and cleaning processes by switching between different bias voltage values and controlling the electric field dynamics between the transfer and cleaning members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed cleaning bias voltage is applied to the cleaning member, then the cleaning process is simple and stable, but the cleaning efficiency deteriorates when toner amount varies
Solution Approach 1:
The cleaning bias voltage is changed from a fixed value to a dynamically adjustable value based on toner amount detection. The cleaning bias controller modifies the cleaning bias voltage applied to the cleaning member according to the detected toner amount on the transfer member, enabling adaptive cleaning efficiency under varying toner conditions.
Solution Approach 2:
A feedback control system is implemented where the toner amount detection unit monitors the toner amount on the transfer member and provides this information to the cleaning bias controller. The controller then adjusts the cleaning bias voltage based on this feedback, creating a closed-loop system that optimizes cleaning performance.
2Reliability
If the cleaning bias voltage is increased to improve cleaning efficiency, then more toner is removed, but energy consumption increases
Solution Approach 1:
The cleaning bias voltage parameter is dynamically changed based on toner amount detection. Instead of using a high fixed voltage that consumes excessive energy, the system adjusts the voltage parameter to match the actual toner amount, achieving effective cleaning with minimal energy consumption.
Solution Approach 2:
The system applies only the necessary cleaning bias voltage required for the detected toner amount, avoiding excessive voltage application. When toner amount is low, a lower voltage suffices, and when toner amount is high, the voltage is increased accordingly, preventing energy waste.
3Productivity
If transfer bias voltage is increased to improve toner transfer, then transfer efficiency improves, but toner adhesion to transfer member increases making cleaning harder
Solution Approach 1:
The system uses feedback from the toner amount detection unit to adjust the cleaning bias voltage. After high transfer bias voltage causes increased toner adhesion, the detection unit measures the accumulated toner amount, and the cleaning bias controller increases the cleaning bias voltage accordingly to remove the excessive adhesion.
Solution Approach 2:
Both transfer bias voltage and cleaning bias voltage are dynamically adjusted based on real-time toner amount detection. The system adapts the cleaning parameters in response to changes in transfer conditions, maintaining effective cleaning even when transfer efficiency is optimized with higher voltages.
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 solution enhances the efficiency of toner transfer and cleaning, maintaining good image quality and cleaning efficiency even with varying toner amounts and environmental changes, by dynamically adjusting the bias voltages and electric field conditions.
Implementation Method 1
The transfer-bias applying unit applies transfer bias voltage so that an electric field for transferring the toner image is generated between the transfer member and the image bearing member
Implementation Method 2
The cleaning-bias applying unit applies cleaning bias voltage between the cleaning member and the transfer member
Data Source
AI summary
An image forming apparatus includes an image bearing member that bears a toner image; a transfer member that faces the image bearing member, nips a recording medium together with the image bearing member, and allows the recording medium to pass therebetween; a transfer-bias applying unit that applies transfer bias voltage to generate an electric field between the transfer member and the image bearing member; a cleaning member that is disposed in contact with the transfer member and removes toner from the transfer member; a cleaning-bias applying unit that applies cleaning bias voltage between the cleaning member and the transfer member; a transfer-toner-amount estimating unit that estimates an amount of toner to be transferred from the image bearing member to the transfer member when the recording medium does not pass therebetween; and a cleaning-bias controller that controls the cleaning bias voltage in correspondence with the estimated amount of toner.