Cleaning Cover Linkage for Transparent Window Staining in Image Forming
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Solution Overview
Problem
Image forming apparatuses face errors due to impurities staining the transparent window of the light scanning unit, which are not effectively cleaned by existing technologies.
Innovation Solution
An image forming apparatus with a cleaning unit that includes a movable cleaning cover linked to the developing roller, which uncovers and covers the transparent window in conjunction with the roller's movement, utilizing a drive device and power converter to operate the cleaning cover and a cleaning sheet to clean the window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the light scanning unit is hermetically sealed to prevent impurity invasion, then the protection against impurities is improved, but the transparent window becomes stained with internal impurities causing image forming errors
Solution Approach 1:
The patent extracts the cleaning function from the hermetically sealed light scanning unit by introducing a cleaning cover that can be moved to access and clean the transparent window. This allows the window to be cleaned of internal impurities while maintaining the hermetic seal during normal operation.
Solution Approach 2:
The cleaning cover is designed to be movable between a closed position (protecting the window) and an open position (allowing cleaning). This dynamic mechanism resolves the contradiction by allowing the system to switch between protection and cleaning modes as needed.
2Reliability
If a cleaning cover is added to clean the transparent window, then the cleaning effectiveness is improved, but the device complexity increases
Solution Approach 1:
The cleaning cover is integrated with the existing light scanning unit structure, merging the cleaning function into the existing housing rather than adding a completely separate cleaning system. This reduces overall device complexity while maintaining cleaning effectiveness.
Solution Approach 2:
The cleaning cover serves multiple functions: it protects the transparent window from impurities, provides a cleaning surface for removing stains, and can be integrated with the developing roller mechanism. This multi-functionality justifies the added complexity by providing multiple benefits from a single component.
3Extent of automation
If the cleaning cover is operated in linkage with the developing roller movement, then the automation is improved, but the device complexity increases
Solution Approach 1:
The cleaning cover is positioned and operated in advance of the actual cleaning need. The linkage mechanism ensures the cleaning cover is ready to clean the transparent window before impurities accumulate significantly, and automatically retreats after cleaning is complete.
Solution Approach 2:
The developing roller's own movement drives the cleaning cover through the linkage mechanism, allowing the system to clean itself without external intervention. The roller's motion is converted into corresponding motion of the cleaning cover, creating a self-service cleaning system.
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
Effectively prevents impurities from adhering to and removes those already adhered to the transparent window, enhancing image forming accuracy and stability by ensuring the window is cleaned during operation.
Implementation Method 1
The power converter may further include a torsion spring fitted on the rotating shaft so as to return the operating arm to an original position.
Data Source
AI summary
An image forming apparatus includes a cleaning unit to cover/uncover and/or clean a transparent window of a light scanning unit in linkage with operation of a drive device that causes a photoconductor and a developing roller to come into contact with each other or to be spaced apart from each other, thereby assuring enhanced reliability in cleaning operation.