Photosensitive Drum Speed Control for Transfer Belt Contact
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Solution Overview
Problem
The existing image forming apparatuses using electrophotographic techniques face issues with wear of the photosensitive drum and vibrations between the cleaning blade and the drum when starting to operate, leading to potential wear and unusual sounds due to improper synchronization of drive speeds between the photosensitive drum and the intermediate transfer belt.
Innovation Solution
The apparatus controls the drive speed of the photosensitive drum to start at a slowest speed when the drum and transfer belt are separated, then transitions to a faster processing speed after contact, and subsequently adjusts back to the slower speed, optimizing the drive speed sequence to minimize vibrations and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the photosensitive drum and intermediate transfer belt are brought into contact before the photosensitive drum starts to be driven, then the unusual sound generation is suppressed, but the photosensitive drum wears due to sliding when starting
Solution Approach 1:
The control unit brings the photosensitive drum and intermediate transfer belt into contact with each other before the photosensitive drum starts to be driven, in advance of the operation that would cause vibration and unusual sound. This preliminary contact ensures that when the drum subsequently starts rotating, the cleaning blade operates under stable conditions without generating unusual sounds, while avoiding the sliding wear problem by establishing contact before motion begins.
2Productivity
If the cleaning blade is optimized for maximum cleaning performance at standard printing speed, then cleaning efficiency is improved, but vibration occurs when the photosensitive drum rotates in unstable conditions
Solution Approach 1:
The control unit adjusts the drive speed of the photosensitive drum as a parameter, transitioning from unstable rotation speeds to the standard printing speed at which the cleaning blade is optimized for maximum cleaning performance. By controlling the speed parameter and ensuring stable rotation before optimal cleaning operation, the system achieves both high cleaning efficiency and blade stability.
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 approach effectively reduces wear on the photosensitive drum and suppresses vibrations between the cleaning blade and the drum, preventing unusual sounds and improving the overall operational stability.
Implementation Method 1
The cleaning blade that is in contact with the photosensitive drum serves as a cleaning unit to scrape and clean residual toner on the photosensitive drum
Implementation Method 2
a toner image that has been formed on a photosensitive drum (photosensitive member) is transferred onto a recording medium, such as a sheet of paper, by using electrostatic forces
Data Source
AI summary
A control unit first drives a photosensitive drum at a normal speed that is faster than a low speed, and the control unit subsequently changes the drive speed of the photosensitive drum from the normal speed to the low speed after a transfer belt is brought into contact with the photosensitive drum that is driven at the normal speed.