The fusing motor [A] drives the hot roller [B] and pressure roller [C], which in turn rotates the opposing heating roller [D] and fusing belt [E].
The heating roller [D] has four heat pipes on its inner surface. These heat pipes surround the fusing lamps at the center. The heat pipes are a closed condenser system. When the fusing lamps heat the pipes, fluid in the closed pipes heats up and evaporates. The evaporating fluid fills the center and capillaries of the pipes. This high temperature conductance maintains a near constant temperature on the surface of the heating roller, which in turn is transferred to the fusing belt.