Transfer Bias Switching for Stable Toner Transfer on Rough Media
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Solution Overview
Problem
Existing electrophotographic image forming apparatuses face challenges in maintaining optimal transfer bias settings due to factors like developer deterioration and resistance changes, leading to inconsistent toner transfer on uneven or rough surfaces.
Innovation Solution
The image forming apparatus generates and switches between multiple transfer conditions, combining DC and AC components, to adjust the transfer bias according to the recording material, using a power supply device and processing circuitry to optimize toner transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a superimposed bias of DC voltage and AC voltage is applied to improve transferability to concaves of uneven paper sheets and rough surface sheets, then transferability is improved, but the optimum superimposed bias shifts due to developer deterioration, resistance change, and environmental factors
Solution Approach 1:
The patent applies dynamics by making the transfer bias adjustable and switchable between multiple predetermined conditions (combinations of DC and AC voltage values). The system dynamically adapts the bias settings based on detected transfer states, allowing the optimum bias to be reselected when environmental factors or material properties change, thereby maintaining reliable transferability without fixed static settings
Solution Approach 2:
The patent implements parameter changes by varying the DC voltage, AC voltage, or their combination across multiple predetermined conditions. The control unit switches between different voltage parameter combinations (e.g., different DC levels, different AC peak-to-peak values) to adapt to changing conditions such as developer deterioration or resistance changes, ensuring consistent transfer performance
2Adaptability or versatility
If multiple predetermined conditions with different DC and AC component combinations are switched to adapt to recording materials, then transfer consistency across different materials is improved, but the control system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing multiple predetermined transfer bias conditions with optimized DC and AC voltage combinations before actual operation. These predetermined conditions are stored in advance and selected based on the recording material type, eliminating the need for complex real-time optimization calculations and reducing control system complexity while maintaining high adaptability
Solution Approach 2:
The patent implements feedback by detecting the transfer state (transfer rate, transfer dust amount, or image density) and automatically selecting the appropriate predetermined transfer bias condition based on the detection results. This closed-loop feedback mechanism simplifies control by using detection data to directly select from pre-optimized conditions rather than requiring complex real-time adjustment algorithms
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 approach stabilizes toner transfer on various surfaces, reducing transfer dust and ensuring high-quality images by adapting to material type and environmental conditions.
Implementation Method 1
a toner image is electrostatically transferred from a photoconductor, an intermediate transfer body, and an image bearer to a recording material such as a paper sheet
Data Source
AI summary
An image forming apparatus includes: an image bearer, a transfer member disposed opposite the image bearer to form a transfer nip between the transfer member and the image bearer; a power supply device to apply a transfer bias; and processing circuitry to generate a plurality of transfer conditions for the transfer bias, the transfer conditions being different from each other and including a combination of values of at least a direct current (DC) component out of the DC component and an alternating current (AC) component, and switch the transfer conditions to apply the transfer bias from the power supply device to the transfer nip. The circuitry transfers an image from the image bearer to a recording material for each one of the transfer conditions according to an adjustment mode that is set among a plurality of adjustment modes for adjusting a transfer bias corresponding to the recording material.