The present invention is related to a device for seizing a flat material (25) such as a web of material (1) on a transporting surface (15). A first cylinder (7) has at least one knife assembly (12) assigned to its respective surface (9). A paper conducting cylinder (14) such as a transfer cylinder or a folding cylinder supports a flat material (25) on its respective outer circumference (15). Biased product seizing element (27) assigned to said circumference (9) of said first cylinder (7) are provided, adopting on cooperation with said leading edge (25) supported on said outer surface (15) of the paper conducting cylinder (14) an engaging position (32).