Image Forming Apparatus Secondary Transfer Roller Voltage Control

The patent introduces an intermediary insulating structure (insulating layer or insulating barrier) between the secondary transfer roller and the apparatus body frame. This mediator prevents direct electrical contact and discharge paths while allowing the compact placement to remain effective.

The patent increases the creepage distance by utilizing the vertical dimension (thickness direction of the apparatus body) rather than only the horizontal plane. By placing the secondary transfer roller at a position where vertical clearance is available, the design achieves adequate insulation without increasing the horizontal footprint or complicating wiring routes.

The insulating structure serves as a mediator that provides the necessary creepage distance without requiring complex wiring routes. Instead of routing wires through lengthy paths to achieve insulation, the insulating barrier directly provides the separation, simplifying the wiring design.

The patent segments the apparatus body structure to create dedicated insulating zones around high-voltage components. By dividing the structure into conductive and insulating regions, the design achieves adequate creepage distance without requiring continuous complex wiring insulation throughout the entire path.

Instead of directly connecting the secondary transfer roller to ground, the patent uses an insulating intermediary structure. This approach prevents discharge paths without requiring active ground connections, control circuits, or additional wiring to manage grounding potentials.

The patent replaces the electrical grounding system with a physical/structural insulating barrier. Rather than using electrical connections (grounding wires, grounding clips) to prevent discharge, the solution uses the mechanical/physical presence of insulating material to block discharge paths, eliminating the need for complex electrical control systems.

The insulating structure acts as a mediator that enables close placement of the high-voltage component while maintaining safety. The intermediary layer allows the secondary transfer roller to be positioned near the apparatus body without creating direct discharge paths, thus maintaining both simplicity and reliability.

The patent changes the electrical parameters by controlling the voltage level and current characteristics to operate within safe limits. By adjusting the transfer voltage and ensuring it remains below discharge thresholds, the system can safely operate with reduced creepage distances while maintaining reliability.