Abstract: A device for feeding a continuous rolled strip (5) of printing substrate to a laser printer (10) not designed for this purpose and for delivering the strip (5) in a predetermined format. There is an input (12) and an output (14) of the printer (10). Each input and output comprises a cutter (32, 34) for the said strip (5) and a device for measuring the length of the strip (5) between two successive cuts. The measuring device actuates the cutters upon the detection by the measuring device of a predetermined length of strip (5) between cuts. The measuring device detects a cut end of the strip (5).