Charging Roller Cleaning Device with Blocking Member
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Solution Overview
Problem
Impurities such as silica and paper dust on the charging roller in image forming apparatuses are not effectively removed, leading to non-uniform charging and defective printing, as existing cleaning devices fail to completely remove these particles, causing contamination and reduced printing quality.
Innovation Solution
A charging roller cleaning device with a rotating cleaning roller and a scraping cleaning member, along with a blocking member to prevent scattered impurities from contaminating the charging roller, is designed to remove impurities and maintain the cleaning roller's effectiveness over time, using materials like rubber, polyethylene terephthalate, or urethane for the cleaning and blocking members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cleaning roller is used to remove impurities from the charging roller, then impurity removal capability is improved, but scattered impurities may contaminate the charging roller again
Solution Approach 1:
A blocking member is introduced as an intermediary element between the cleaning member and the charging roller. This blocking member intercepts impurities scattered during the cleaning process and prevents them from reaching the charging roller surface, thereby solving the re-contamination problem while maintaining effective impurity removal
Solution Approach 2:
The cleaning device is segmented into distinct functional components: a cleaning roller for removing impurities, a cleaning member for scraping the cleaning roller surface, and a blocking member for intercepting scattered impurities. This segmentation allows each component to perform its specific function effectively without interfering with others
2Reliability
If a cleaning member scrapes impurities from the cleaning roller, then cleaning effectiveness is improved, but scattered impurities may damage the photosensitive drum
Solution Approach 1:
The blocking member serves as a protective intermediary positioned between the cleaning member and the photosensitive drum. It captures scattered impurities generated during the scraping process and redirects them into a receiving space, preventing direct contact with and potential damage to the photosensitive drum
3Productivity
If the cleaning member contacts the cleaning roller at an angle, then impurity removal efficiency is improved, but the structure becomes more complex
Solution Approach 1:
The cleaning member is designed with a specific angular orientation relative to the cleaning roller's rotation direction. By optimizing this angular parameter, the cleaning member achieves effective impurity removal through the cleaning roller surface while maintaining a relatively simple structural configuration
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
The solution effectively prevents contamination of the charging roller and photosensitive drum, ensuring uniform charging and improved printing quality, extending the lifespan of the developing unit and reducing replacement costs.
Implementation Method 1
a cleaning roller arranged to rotate, while contacting the charging roller to remove the impurities on the charging roller
Implementation Method 2
a cleaning roller arranged to rotate, while contacting the charging roller to remove the impurities on the charging roller
Implementation Method 3
a cleaning member arranged to scrape off impurities attached on the cleaning roller
Implementation Method 4
a blocking member located between the cleaning member and the charging roller to block the impurities that are scattered by the cleaning member so as not to contaminate the charging roller
Data Source
AI summary
A charging roller cleaning device is provided for removing impurities attached on a charging roller that charges a photosensitive medium to a uniform electric potential. Such a cleaning device includes: a cleaning roller arranged to rotate, while contacting the charging roller to remove the impurities attached on the charging roller; and a cleaning member arranged to scrap off impurities attached on the cleaning roller.