Image Forming Apparatus Transfer Nip Length Optimization
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Solution Overview
Problem
Image forming apparatuses face inefficiencies in transferring toner images with large toner amounts, leading to lower transfer efficiency and increased toner consumption, particularly when combined with smaller toner amount images on the same transfer conditions.
Innovation Solution
The apparatus employs a longer transfer nip for toner images with larger amounts to reduce the required driving force and enhance transfer efficiency, using a secondary transfer member with a longer contact length than the primary transfer member, specifically for light color and white toners which have higher toner amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same transfer conditions are used for all toner images, then the device complexity is reduced, but the transfer efficiency decreases for toner images with large toner amounts
Solution Approach 1:
The patent applies different transfer conditions to different toner images based on their local characteristics. Specifically, it extends the transfer nip length for toner images with large toner amounts (such as light color toners and white toners) while maintaining the original nip length for toner images with small toner amounts. This local differentiation resolves the contradiction by improving transfer efficiency for specific toner types without increasing overall device complexity.
2Productivity
If the transfer nip length is extended for toner images with large toner amounts, then the transfer efficiency is improved, but the driving force required increases
Solution Approach 1:
The patent extends the transfer nip length selectively only for toner images with large toner amounts, rather than uniformly for all toner images. This localized extension improves transfer efficiency for light color and white toners while minimizing the increase in driving force, as the extended nip is applied only where necessary to handle the larger toner loads.
3Productivity
If the transfer nip length is extended, then the transfer efficiency for large toner amount images is improved, but the device complexity increases
Solution Approach 1:
The patent segments the transfer members into different types based on the toner images they handle. It introduces a first transfer member with a first transfer nip length for toner images with small toner amounts and a second transfer member with a second transfer nip length (longer than the first) for toner images with large toner amounts. This segmentation allows each transfer member to be optimized for its specific function, improving overall transfer efficiency while managing device complexity through modular design.
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 configuration increases transfer efficiency and reduces toner consumption by maintaining high image quality while minimizing the increase in driving force required for intermediary transfer, particularly for light color and white toners with higher toner amounts.
Implementation Method 1
a first transfer member for electrostatically transferring the first toner image onto a transfer medium in a first transfer nip formed by bringing the transfer medium into contact with the first image bearing member
Data Source
AI summary
An image forming apparatus includes a first image carrying member for carrying a first toner image; a second image carrying member for carrying a second toner image in a maximum amount, of the second toner image carried on the second image carrying member, larger than a maximum amount of the first image carried on the first image carrying member; a first transfer member for electrostatically transferring the first toner image onto a transfer medium in a first transfer nip formed by bringing the transfer medium into contact with the first image carrying member; and a second transfer member for electrostatically transferring the second toner image onto the transfer medium in a second transfer nip formed by bringing the transfer medium into contact with the second carrying member so that a length of the second transfer nip with respect to a movement direction of the second transfer member is longer than a length of the first transfer nip with respect to the movement direction.