Voltage Control for Photosensitive Drum Rubbing Damage Prevention

The patent replaces the mechanical contacting and separating mechanism with an electrostatic field-based solution. By applying voltage to the photosensitive drum surface, an electrostatic field is generated that prevents rubbing damage without requiring mechanical separation or positioning mechanisms, thus simplifying the overall device structure.

The patent changes the physical state of the photosensitive drum surface by applying voltage, which alters the surface properties to prevent rubbing damage. This parameter change (from neutral to charged state) enables damage prevention without mechanical intervention.

The patent replaces expensive mechanical separation mechanisms with a simple voltage application system. This substitution eliminates the need for complex positioning and separation parts, significantly reducing manufacturing and assembly costs while maintaining damage prevention functionality.

The patent uses a simple, inexpensive voltage application system instead of expensive mechanical separation mechanisms. The electrostatic field is generated through a straightforward voltage application setup that is much cheaper to manufacture and assemble than mechanical separation systems.

The patent applies voltage periodically only during the start-up and rest periods when rubbing damage is most likely to occur, rather than continuously. This periodic voltage application maintains effective damage prevention while minimizing overall energy consumption.

The patent applies voltage in advance during start-up and rest periods before rubbing damage can occur. This preliminary action prevents damage at its source while the system is in vulnerable states, rather than continuously maintaining the electrostatic field.