Toner fusing device with a supply of fusing oil

The invention relates to a device for fusing toner, in particular powder toner, to a printing material (8), said device comprising at least one fusion roller (1), which can be warmed or heated and which contacts the toner for fusing, and comprising at least one working roller (6,7) which is preferably arranged axis-parallel to the fusion roller (1) and in abutting contact with the surface of the fusion roller (1) or which can be brought into abutting contact with the surface of the fusion roller (1). Therefore, the object of the invention is to further improve a device of the aforementioned type in view of a controlled and/or uniform film of a liquid fusion adjuvant. In accordance with the invention, this object is achieved in that the working roller (6,7) or at least one working roller (6,7) can be moved in an oscillating manner in its axial direction.