Abstract: A device for processing cardboard blanks, in particular of plastic laminated beverage cardboards, comprises a scarfing station including a scarfing device for scarfing blanks by means of a bell knife, wherein the scarfing device comprises a housing, whereon a knife shaft is received rotatably, at which a bell knife is received exchangeably, and further comprising a drive motor for the knife shaft, wherein the housing at one side is held by means of a hinge in a preadjusted working position within which the bell knife allows the scarfing of blanks, and wherein a locking device is coupled with the at least one hinge to allow either a locking of the scarfing device in the working position, or a pivoting into a maintenance position or a lifting of the scarfing device upwardly for exchanging the bell knife.