Oce Printing Systems Gmbh

Florian Köfferlein

Uwe Höllig

Admir Lela

Ralf Selinger

In a device or method for sealing a shaft against penetration of a two-component toner mixture comprising magnetic carrier particles and toner particles, an annular, stationary sealing device is arranged radially at a distance of an annular gap around the shaft. The annular gap is charged with a magnetic field. The annular gap is filled with a mixture of a semi-fluid, highly viscous barrier medium and magnetic carrier particles, and wherein the mixture in the annular gap contains 40 to 85 percent by weight or 15 to 60 percent by volume of the magnetic carrier particles.

Device and method for sealing a shaft to prevent the penetration of a toner mixture

In a developer station for a printer or copier, a rotating developer roller is provided having a mixture of toner particles and ferromagnetic carrier particles accumulated on a surface of the developer roller as a layer, and a transfer zone at which the toner particles are transferred away from the developer roller. A smoothing device is provided with a smoothing element arranged before the transfer zone, the smoothing element being charged with a mechanical tension in a rest state of the developer roller and designed such that it exerts a force on and over an entire width of the layer formed by the mixture of the toner particles and the carrier particles present on the developer roller and smoothes the layer before the transfer of the toner particles. Within the developer roller at least one magnet is provided. The smoothing element comprises a magnetizable material attracted toward said at least one magnet to create said mechanical tension.

Growing community of inventors

Munich, Germany

Florian Köfferlein