Transfer Device Pressing Force Control for Toner Scattering
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Solution Overview
Problem
Existing image forming apparatuses face issues with toner scattering and quality degradation due to the vibration of the transfer belt when transferring images onto thick paper sheets, particularly with white toner, as the increased mass of the toner leads to higher forces during contact, causing scattering.
Innovation Solution
A transfer device with a setting portion that adjusts the pressing force exerted on the recording medium, applying a second pressing force that is smaller than the first when the mass of the uppermost toner layer exceeds a threshold, reducing the impact and vibration on the transfer belt, thereby minimizing toner scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a first pressing force is applied to transfer the toner image, then the transfer efficiency is improved, but toner scattering occurs when the toner mass is large
Solution Approach 1:
The pressing force is made dynamically adjustable based on the toner mass. The setting portion changes the pressing force from a first pressing force to a second pressing force according to the mass of the uppermost toner layer, allowing the system to adapt to different toner conditions and prevent scattering while maintaining transfer efficiency.
Solution Approach 2:
The pressing force parameter is changed based on the toner mass condition. When the toner mass exceeds a threshold, the pressing force is reduced from the first pressing force to the second pressing force, optimizing the transfer process for different toner quantities and preventing harmful scattering effects.
2Device complexity
If a constant pressing force is applied, then the transfer process is simple, but image quality degrades due to toner scattering
Solution Approach 1:
A feedback mechanism is implemented where the setting portion detects the toner mass and adjusts the pressing force accordingly. This feedback loop ensures that the pressing force is optimized for each transfer condition, preventing toner scattering and maintaining high image quality without excessive system complexity.
Solution Approach 2:
The pressing force control transitions from a static constant force to a dynamic adjustable force based on toner mass conditions, improving image quality while maintaining reasonable system complexity through automated adjustment.
3Productivity
If a first pressing force is used for all conditions, then the transfer process is consistent, but the transfer belt and rollers suffer from increased wear
Solution Approach 1:
The pressing force parameter is changed from a constant first pressing force to a variable force that switches to a second pressing force under specific conditions. This parameter change reduces wear on the transfer belt and rollers when large toner masses are present, extending their service life while maintaining consistent transfer processes.
Solution Approach 2:
The potentially harmful high pressing force that causes wear is converted into a beneficial conditional adjustment. By applying the first pressing force only when necessary and switching to a second pressing force when toner mass is large, the system protects the transfer belt and rollers from excessive wear while maintaining transfer efficiency when needed.
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 effectively reduces toner scattering and improves image quality by adjusting the pressing force based on the toner mass, specifically for thick paper sheets, enhancing the durability of the transfer belt and rollers while maintaining image quality.
Implementation Method 1
a transfer body that presses a recording medium against the holding body with a first pressing force or a second pressing force, which is smaller than the first pressing force, to transfer the toner image to the recording medium
Implementation Method 2
transfer the toner image to the recording medium while transporting the recording medium between the transfer body and the holding body
Data Source
AI summary
A transfer device includes a holding body that holds a toner image; a transfer body that presses a recording medium against the holding body with a first pressing force or a second pressing force, which is smaller than the first pressing force, to transfer the toner image to the recording medium while transporting the recording medium between the transfer body and the holding body; and a setting portion that sets a pressing force exerted on the recording medium at the second pressing force when a mass of a toner of an uppermost toner layer constituting the toner image and disposed on the holding body is equal to or exceeds a threshold.