Transfer Roller Diameter Optimization for Paper Dust Buffering
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face issues with paper dust contamination, leading to image defects like image unevenness and spots, especially when dealing with paper types that generate excessive dust, as the existing paper dust collection mechanisms are overwhelmed, causing paper dust to adhere to the development roller and contaminate the toner.
Innovation Solution
The apparatus features a transfer roller with a larger diameter than the development roller and cleaning roller, which temporarily retains paper dust, reducing its transfer to the development roller, and includes a paper dust collection mechanism with a cleaning roller to effectively manage excessive paper dust, with the diameters of the rollers optimized to minimize paper dust contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a conventional paper dust collection mechanism is used, then transfer residual toner is collected, but paper dust is also captured and adhered to the development roller, causing image defects
Solution Approach 1:
The patent divides the roller system into distinct functional segments: a cleaning roller for paper dust collection and a development roller for toner supply. By segmenting the dust collection function from the development function, paper dust is directed to the cleaning roller while toner remains on the development roller, preventing contamination and image defects.
2Quantity of substance
If the amount of paper dust on the photosensitive drum is large, then more paper dust is generated, but the existing processing cannot sufficiently separate and collect it, leading to increased paper dust in the development container
Solution Approach 1:
The patent introduces a cleaning roller as an intermediary component between the photosensitive drum and the development container. This cleaning roller acts as a mediator that intercepts and collects paper dust before it can reach the development container, thereby maintaining reliable paper dust collection capability even when paper dust generation is high.
3Reliability
If a larger diameter transfer roller is used, then paper dust buffering capability is improved, but the overall device size increases
Solution Approach 1:
The patent applies local quality by optimizing the transfer roller diameter specifically at the paper dust collection zone. The transfer roller has a diameter of 14mm in the paper dust collection portion, which is larger than the development roller (13mm) to provide adequate paper dust buffering capability, while maintaining a compact overall device size through localized rather than universal enlargement.
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 significantly suppresses paper dust contamination by reducing the amount of paper dust collected by the development roller, thereby preventing image defects and maintaining image quality, with the optimal diameter ratio of the transfer roller to the development roller being less than or equal to 0.467, ensuring efficient paper dust buffering and collection.
Implementation Method 1
a cleaning roller being in contact with the photosensitive drum, configured to clean a part of the recording material adhered to the photosensitive drum
Implementation Method 2
a transfer roller configured to transfer a developer image formed on the photosensitive drum to a recording material
Implementation Method 3
a development roller configured to supply developer to the photosensitive drum
Data Source
AI summary
An image forming apparatus includes a photosensitive drum, a development roller configured to supply developer to the photosensitive drum, a transfer roller configured to transfer a developer image formed on the photosensitive drum to a recording material, and a cleaning roller being in contact with the photosensitive drum, configured to clean a part of the recording material adhered to the photosensitive drum, wherein the diameter of the transfer roller is greater than the diameter of the development roller and the diameter of the cleaning roller is greater than the diameter of the development roller.