Fixiermechanismus mit balligen Walzen

摘要

The appts for fusing toner images to substrates, includes an elongated heated fuser roll having a crowned surface and a non-crowned surface, and an elongated pressure roll having a crowned surface and a non-crowned surface. The pressure roll is supported for pressure engagement with the fuser roll to form a nip therebetween adapted to receive the substrates. The pressure roll comprises a surface having a maximum diameter in the central region thereof, and the fuser roll comprises a surface having a maximum diameter offset from the maximum diameter of the pressure roll. Uniform pressure and velocity are applied on the substrates in the nip, using a loading device for deflecting the pressure roll into pressure engagement with the fuser roll to form the nip. The sum of the distance between the non-crowned surface and crowned surface of the fuser roll and the pressure roll is approximately equal to the sum of the deflection of the fuser roll and the pressure roll so that the fuser roll and the pressure roll form non-crowned surfaces when in pressure engagement with one another. The pressure roll is supported rotatably in contact with the fuser roll.