Transfer Bias Adjustment via Sheet Resistance Detection
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Solution Overview
Problem
Conventional image forming apparatuses face issues with transfer current imbalances due to variations in sheet resistance, leading to defects in image transfer, as they rely on pre-set resistance values that may not accurately match actual sheet resistance, requiring manual adjustment by service personnel.
Innovation Solution
An image forming apparatus with a processor, detector, and memory that measures and adjusts the transfer bias in real-time based on the actual sheet resistance, using a transfer adjustment pattern to correct the bias setting and ensure it falls within an allowable range, allowing users to adjust settings easily.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-set resistance values are used for transfer control, then the system is simple to operate, but transfer defects occur due to mismatch between setting resistance value and actual sheet resistance
Solution Approach 1:
The system automatically detects the actual resistance value of sheets in the cassette and feeds back this information to adjust the transfer bias setting. The detector measures resistance between the transfer member and image carrier, and the processor uses this feedback to determine appropriate transfer bias, eliminating the need for manual pre-setting while ensuring reliable transfer.
Solution Approach 2:
The system performs self-adjustment by automatically detecting sheet resistance and correcting transfer bias settings without requiring service personnel intervention. The processor autonomously compares detected resistance values with stored reference values and adjusts transfer bias accordingly, enabling the system to service itself.
2Measurement precision
If manual adjustment by service personnel is required, then transfer control precision can be improved, but device complexity and maintenance difficulty increase
Solution Approach 1:
The system automatically detects resistance values and adjusts transfer bias settings without requiring service personnel. The detector and processor work together to perform self-diagnosis and self-adjustment, eliminating the need for manual intervention while maintaining precise control.
Solution Approach 2:
The system continuously monitors resistance values through the detector and uses this feedback to automatically adjust transfer bias. This closed-loop control system maintains precise measurement and adjustment capabilities while eliminating the need for manual service intervention.
3Manufacturing precision
If transfer bias is adjusted according to actual sheet resistance, then transfer current accuracy is improved, but device complexity increases due to additional detection and control systems
Solution Approach 1:
The detector serves multiple functions: it detects sheet resistance values, monitors transfer conditions, and provides feedback for bias adjustment. By making the detection system multi-functional, the patent avoids adding separate dedicated components for each function, thereby limiting the increase in device complexity while achieving accurate transfer current control.
Solution Approach 2:
The resistance detection function is merged with the existing transfer control system. The detector that was already part of the transfer member assembly is used to measure resistance, and the processor integrates resistance detection with transfer bias control, combining multiple functions into existing components to minimize added complexity.
4Ease of operation
If constant voltage control is used, then control simplicity is maintained, but transfer current shortage or excess discharge occurs due to resistance variation
Solution Approach 1:
The system dynamically adjusts transfer bias based on detected sheet resistance values. Instead of using a fixed constant voltage setting, the processor modifies the transfer bias in real-time according to the actual resistance conditions, allowing the system to adapt to varying sheet properties while maintaining operational simplicity.
Solution Approach 2:
The system changes the transfer voltage parameter based on detected resistance values. When resistance varies, the processor adjusts the transfer bias magnitude accordingly, transforming the static constant voltage control into a dynamic parameter-adjustment system that maintains reliability without complicating operation.
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 prevents transfer defects by accurately adjusting the transfer bias according to the sheet's resistance, ensuring reliable image formation on various types of sheets, enhancing user convenience and reducing manual intervention.
Implementation Method 1
the detector measures a voltage value or a current value in the transfer member so as to calculate a value indicating a resistance value of the sheet passing through the transfer position
Data Source
AI summary
In one embodiment, the image forming apparatus has a transfer member, a detector, a display, a transfer bias power source circuit, a memory, a processor, and so on. The processor calculates a value indicating a resistance value of a sheet, based on a measurement value of a voltage value or a current value of the transfer member by the detector. Further, when the calculated value indicating the resistance value of the sheet is a value outside a range of an allowable range stored in the memory, the processor makes the display display a message to recommend adjustment of a transfer bias to be applied to the transfer member by the transfer bias power source circuit.