Image Forming Device Moisture-Adaptive Transfer Control
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Solution Overview
Problem
Image forming devices face challenges in maintaining uniform image quality across both sides of a paper sheet due to varying moisture content, leading to differences in transfer properties and image quality, especially when moisture levels change, such as in rainy or dry conditions.
Innovation Solution
An image forming device equipped with a measurement unit that illuminates the paper sheet with light to measure light intensity and calculates the surface moisture content, adjusting transfer conditions accordingly to ensure consistent image quality across multiple transfers on a single sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same transfer voltage is used for both sides of the paper sheet, then the device operation is simple, but the image quality on the first side and second side becomes uneven due to moisture content changes
Solution Approach 1:
The transfer voltage is changed from a static fixed value to a dynamic adjustable parameter. The control unit dynamically adjusts the transfer voltage based on real-time moisture content measurements of the paper sheet surface, allowing the system to adapt to changing conditions while maintaining consistent image quality across both sides of the paper sheet.
Solution Approach 2:
A feedback loop is established where the moisture content measurement unit continuously monitors the paper sheet surface moisture, and the control unit uses this feedback information to automatically adjust the transfer voltage. This closed-loop control ensures that image quality remains uniform despite variations in environmental moisture conditions.
2Manufacturing precision
If the transfer voltage is increased to compensate for low moisture content, then image transfer quality improves, but energy consumption increases
Solution Approach 1:
The transfer voltage parameter is adjusted according to the measured moisture content parameter. When moisture content is high, a lower transfer voltage is sufficient for quality transfer. When moisture content is low, the voltage is increased only to the extent necessary to maintain image quality, avoiding unnecessary energy consumption.
Solution Approach 2:
The transfer voltage is optimized locally according to the local moisture content conditions of the paper sheet surface. Rather than using a high fixed voltage in all conditions, the system applies the minimum necessary voltage locally adapted to current moisture levels, reducing overall energy consumption while maintaining transfer quality.
3Manufacturing precision
If moisture content measurement and dynamic voltage adjustment are implemented, then image quality uniformity improves, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions: it controls the transfer voltage, manages the moisture content measurement process, and automatically adjusts parameters based on measurements. By consolidating these functions in a single control unit, the system achieves sophisticated image quality control without proportionally increasing overall device complexity.
Solution Approach 2:
The system performs self-adjustment by automatically measuring moisture content and adjusting transfer voltage without requiring manual intervention. This self-service capability maintains high image quality consistency while minimizing the need for additional complex control mechanisms or user interaction systems.
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
The device achieves uniform image quality regardless of surface moisture content, ensuring consistent print quality on both sides of the paper sheet by dynamically adjusting transfer conditions based on real-time moisture measurements.
Implementation Method 1
a measurement unit provided with at least one light source, configured to illuminate the paper sheet with light, receive the light reflected from the paper sheet, and measure intensity of the received light
Data Source
AI summary
The invention achieves uniform image quality for every transfer regardless of a moisture content on a surface of a paper sheet when a plurality of transfer processes is to be made on a single paper. A copier (1A) is provided with a optical sensor (20) which includes at least one light source, illuminates a paper sheet (P) with light, receives the light reflected from the paper sheet (P), and measures the received light intensity. Before each of a plurality of transfer processes, the copier (1A) calculates a moisture content on a surface of the paper sheet (P) from the light intensity measured by the optical sensor (20), and sets a transfer condition of a transfer device (15) based on the calculated moisture content on the surface of the paper sheet (P).