Dynamic Contact Width Adjustment for Image Transfer Stability
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Solution Overview
Problem
Image forming apparatuses face issues with streak-like image disturbances and toner scattering on thick and coated papers due to the characteristics of these papers, which affect the stability of the second transfer electric field and toner adhesion, respectively.
Innovation Solution
The apparatus adjusts the width of contact between the intermediate transfer belt and the second transfer member based on paper attribute information, using moving mechanisms to vary the amount of bite and offset position, thereby reducing the impact force on thick papers and preventing toner scattering on coated papers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of contact between the intermediate transfer belt and the second transfer member is kept constant, then the transfer process is simple to control, but streak-like image disturbances occur on thick papers and toner scattering occurs on coated papers
Solution Approach 1:
The patent implements a dynamic adjustment mechanism that varies the width of contact between the intermediate transfer belt and the second transfer member based on paper attributes. The contact width changing section modifies the bite amount and offset position according to the thickness and surface characteristics of the paper being processed, transforming a static transfer system into a dynamic one that adapts to different paper types to prevent image defects
Solution Approach 2:
The system changes physical parameters of the transfer process by adjusting the contact width between the intermediate transfer belt and second transfer member. By modifying the bite amount and offset position as controllable parameters, the system optimizes transfer conditions for different paper attributes, thereby improving image quality without excessive complexity
2Reliability
If the contact width between the intermediate transfer belt and the second transfer member is increased, then toner adhesion is improved, but impact force increases causing streak-like disturbances on thick papers
Solution Approach 1:
The patent adjusts the contact width parameter dynamically based on paper attributes. For thick papers, the system reduces the contact width (bite amount) to decrease impact force and prevent streak-like disturbances, while for coated papers it increases the contact width to improve toner adhesion. This parameter adjustment resolves the contradiction between maintaining good toner adhesion and avoiding excessive impact force
3Reliability
If the offset position of the second transfer member is adjusted, then toner scattering is prevented on coated papers, but the transfer mechanism becomes more complex
Solution Approach 1:
The patent introduces a dynamic offset position adjustment mechanism that shifts the second transfer member relative to the intermediate transfer belt based on paper attributes. For coated papers, the offset position is adjusted to prevent toner scattering, while for other papers the standard position is maintained. This dynamic positioning system achieves improved toner transfer stability without requiring a completely new complex mechanism
Solution Approach 2:
The offset adjustment mechanism serves multiple functions: it prevents toner scattering on coated papers, maintains proper alignment for other paper types, and works in conjunction with the bite amount adjustment to optimize overall transfer performance. This multi-functional approach reduces the need for separate specialized mechanisms
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 adjustment significantly reduces streak-like image disturbances on thick papers and prevents toner scattering on coated papers, improving image quality by stabilizing the transfer process.
Implementation Method 1
an intermediate transfer belt that is stretched by multiple rollers, the intermediate transfer belt transporting a toner image on an outer peripheral surface
Implementation Method 2
a second transfer member that performs second transfer, the second transfer transferring the toner image on the intermediate transfer belt to a recording medium
Data Source
AI summary
An image forming apparatus includes an intermediate transfer belt that is stretched by multiple rollers, the intermediate transfer belt transporting a toner image on an outer peripheral surface, a second transfer member that performs second transfer, the second transfer transferring the toner image on the intermediate transfer belt to a recording medium, an opposed member that abuts against an inner peripheral surface of the intermediate transfer belt, the opposed member being opposed to the second transfer member, and a changing section that changes a width of contact between the intermediate transfer belt and the second transfer member at a second transfer position, on a basis of paper attribute information of the recording medium, the second transfer position being a position where the second transfer member abuts against the opposed member with the intermediate transfer belt being sandwiched between the second transfer member and the opposed member.