Transfer Voltage Adjustment for Mixed Recording Materials
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Solution Overview
Problem
Existing image forming apparatuses face challenges in adjusting transfer voltage to accommodate various recording materials with different electric resistances and environmental conditions, leading to image defects and increased user burden in setting appropriate secondary transfer voltages.
Innovation Solution
The apparatus incorporates a detecting portion to identify material indices, a controller to execute an adjusting chart with test images, and an inputting portion for user instruction, allowing automatic adjustment of transfer voltage based on detected indices or user input, reducing operation burden and waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the secondary transfer voltage is manually adjusted using service mode or user mode to accommodate different recording materials, then the transfer image quality is improved, but the user burden and operation complexity increase
Solution Approach 1:
The system automatically detects recording material properties (electric resistance, basis weight, thickness) and adjusts secondary transfer voltage without user intervention. The control unit performs self-service by selecting optimal voltage based on detected material characteristics, eliminating the need for manual service mode operations.
Solution Approach 2:
The system uses a detecting portion to measure recording material properties and feeds this information back to the control unit, which then adjusts the secondary transfer voltage accordingly. This closed-loop feedback mechanism ensures optimal transfer quality while automating the adjustment process.
2Adaptability or versatility
If the secondary transfer voltage is adjusted to accommodate various recording materials with different electric resistances, then the adaptability to different materials is improved, but the device complexity increases
Solution Approach 1:
The system replaces manual mechanical adjustment mechanisms with an automated detection and control system. The detecting portion measures material properties and the control unit calculates optimal voltage, substituting complex manual adjustment procedures with automated electronic control based on material characteristics.
Solution Approach 2:
The system changes the secondary transfer voltage parameter based on detected recording material properties such as electric resistance, basis weight, and thickness. By dynamically adjusting this parameter according to material characteristics, the system achieves high adaptability without requiring complex mechanical adjustment mechanisms.
3Measurement precision
If multiple test images are transferred with different voltages to create an adjusting chart, then the accuracy of voltage selection is improved, but the loss of recording material increases
Solution Approach 1:
The system performs a limited number of test transfers (typically 3-5 test images with different voltages) to create an adjusting chart, which is sufficient to determine optimal voltage without requiring excessive test material. This partial action approach balances measurement precision with material conservation.
Solution Approach 2:
The system performs preliminary detection of recording material properties (electric resistance, basis weight, thickness) before creating the adjusting chart. This preliminary action allows the system to pre-calculate optimal voltage ranges, reducing the number of test transfers needed and minimizing material waste.
4Manufacturing precision
If the secondary transfer voltage is increased to ensure complete toner transfer, then the transfer completeness is improved, but image defects such as white voids occur
Solution Approach 1:
The system dynamically changes the secondary transfer voltage parameter based on detected recording material properties. By matching the voltage to the specific material characteristics (electric resistance, basis weight, thickness), the system achieves complete toner transfer without applying excessive voltage that would cause white voids or other image defects.
Solution Approach 2:
The system applies locally optimized voltage settings tailored to specific recording material properties. Instead of using a fixed high voltage for all materials, the voltage is locally adjusted according to each material's electric resistance and physical characteristics, ensuring complete transfer while preventing image defects.
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 enables efficient and user-friendly adjustment of transfer voltage, minimizing image defects and waste by automating the process of selecting optimal transfer conditions for diverse recording materials.
Implementation Method 1
The kinds of the recording materials are classified by, for example, a difference in smoothness (surface property) such as (high-)quality paper (coated paper) and a difference in electric resistance due to the thickness and a filler
Implementation Method 2
Transfer of the toner image from the image bearing members such as the photosensitive drum and the intermediary transfer belt onto a recording material is made electrostatically in many instances by applying a transfer voltage to a transfer member forming a transfer portion in contact with the image bearing member
Data Source
AI summary
An image forming apparatus includes an image bearing member, a voltage applying portion, a feeding portion, a detecting portion, a storing portion, a controller for controlling a first operation in which on the basis of a detection result of the detecting portion, a kind of the recording material set in the feeding portion is stored in the storing portion, and a second operation in which an adjusting chart is outputted for adjusting a transfer voltage; and an inputting portion. In response to a single start instruction, the controller is capable of carrying out control so as to execute the first operation and the second operation for outputting the adjusting chart prepared by transferring a plurality of test images onto the recording material from which an index interrelating with the kind of the recording material is detected by the detecting portion in the first operation.