Transfer Unit With Alternating-Current Bias and Back-Surface Humidification
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Solution Overview
Problem
Conventional transfer devices face challenges in achieving high transfer performance due to concerns about leakage of alternating current when using a combination of alternating-current bias and humidification, which affects the transfer of images onto recording materials with uneven surfaces.
Innovation Solution
A transfer device that combines the application of an alternating-current bias with back-surface humidification, where a transfer unit applies a voltage with an alternating-current component to an image carrier and a humidifying unit moisturizes the recording material from its opposite surface, effectively addressing the issue of electrical discharge and improving transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If alternating-current bias is applied to improve transfer performance, then transfer efficiency is improved, but electrical leakage occurs through humid recording material
Solution Approach 1:
The patent divides the recording material into two surfaces: the front surface (image-receiving surface) remains dry to prevent electrical leakage, while the back surface is selectively humidified to improve transfer performance. This segmentation allows each surface to serve its specific function without interfering with the other.
Solution Approach 2:
The patent applies humidification locally only to the back surface of the recording material, not the entire material. This localized treatment provides the moisture needed for improved transfer performance while maintaining dry conditions on the front surface to prevent electrical leakage during the transfer process.
2Manufacturing precision
If humidification is applied to improve transfer performance on uneven surfaces, then transfer quality is improved, but alternating current leakage increases
Solution Approach 1:
The patent separates the humidification function from the transfer interface by applying moisture only to the back surface of the recording material. This segmentation ensures that the front surface at the transfer interface remains dry, preventing electrical discharge while still allowing humidification to improve transfer quality through its effect on the back surface.
Solution Approach 2:
The back surface of the recording material acts as an intermediary that receives humidification treatment. This intermediary surface transmits the beneficial effects of humidification (improved transfer quality) to the front surface without being present at the critical transfer interface where electrical discharge would occur.
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 combination significantly enhances transfer performance by ensuring consistent voltage application across uneven surfaces, resulting in improved image transfer quality, particularly for embossed paper, without significant leakage issues.
Implementation Method 1
a transfer unit that transfers an image on an image carrier carrying the image onto a first surface of a recording material by applying a voltage containing an alternating-current component
Implementation Method 2
a humidifying unit that humidifies the recording material transported toward the transfer unit from a second surface of the recording material
Data Source
AI summary
A transfer device includes a transfer unit that transfers an image on an image carrier carrying the image onto a first surface of a recording material by applying a voltage containing an alternating-current component to the recording material; and a humidifying unit that humidifies the recording material transported toward the transfer unit from a second surface of the recording material that is opposite to the first surface.