Device for feeding a printing-material web to an electrographic printing device

A device for supplying a printing substrate web to an internal transport path of the printing substrate web of a printing device, comprising:

• a pre-centering device that accepts the printing substrate web from a printing substrate web source, the pre-centering device has a guide and tensioning element via which the printing substrate web is directed in an S-shape with a wrap angle and wherein the pre-centering device is designed so as to be able to rotate to adjust the wrap angle;
• a drive unit comprising first and second adjacent drive rollers with the web in between, the first drive roller being a driven drive roller, said drive unit following an output of the pre-centering device and which draws the printing substrate web from the pre-centering device and thereby drives the pre-centering device, said drive unit receiving the web under tension provided by the pre-centering device;
• a buffer device at the drive unit and which has a buffer reservoir, said driven first drive roller being on and fixed at an edge of a side wall of the buffer device facing said pre-centering device, the second drive roller being adjacent to the first drive roller in the buffer reservoir such that it can pivot, the buffer reservoir having at a floor a negative pressure device that generates a negative pressure in the buffer reservoir, the negative pressure of the negative pressure device acting on the printing substrate web to pull the printing substrate web drawn by the drive unit into the buffer reservoir and thereby tensions the printing substrate web before it is supplied to the internal transport path.