Digital printing or copying machine and process for fixing a toner on a substrate

Printing or copying machine (1) for one-sided or double-sided printing of a substrate (5) using at least one toner, with at least one fixing device (3) for fixing of a toner image (29) on the substrate (5), the fixing device (3) having at least one heater (21, 23) for melting the toner image (29), past which the substrate (5) can be guided by a transport device (11) which has several transport elements (19, 63 to 71), said fixing device characterized in that said heater (21, 23) has at least two melt areas (31, 33, 43 to 47) on the substrate (5) which viewed in the substrate transport direction (15), are arranged in succession and laterally offset to one another, and at least one cooling device (25, 27) for cooling the substrate (5) and/or the melted toner image (2), wherein at least one cooling area (39, 41, 53 to 57) of the cooling device (25, 27), on the substrate (5), at a time is directly downstream of each melt area (31, 33, 43, 45, 47) of the heater (21, 23), wherein viewed in the substrate transport direction (15) the width of the melt area (31, 33, 43, 45, 47) and the width of the cooling area (39, 41, 53 to 57) are the same.