Abstract: The invention relates to a circular knife device (10) for cutting to size sheet-like materials, in particular paperboard and/or textile materials, in particular cover boards and/or covering materials, wherein the circular knife device (10) defines a cutting plane in which the sheet-like materials are arranged and are moved in a transport direction (14), having at least one circular knife (46) and an associated circular knife axis, wherein the circular knife (46) is rotatable about the circular knife axis, wherein the at least one circular knife (46) is movable parallel to the cutting plane and perpendicularly to the transport direction (14) with the result that a blank width of the sheet-like materials is settable in a variable manner, wherein the at least one circular knife (46) is mounted so as to be pivotable about a pivot axis (52) arranged substantially perpendicular to the cutting plane such that cuts at an angle to the transport direction (14) and curved cuts of the sheet-like materials are able to be

Abstract: A method for the adjustment of the width of a flexible spine material in a device for the fabrication of book covers, which involves the steps of setting a desired width of the spine material on a control unit of the device for the fabrication of book covers, and of starting a size-changing program including advancing the flexible spine material and simultaneously adjusting the position of a knife adapted to cut a longitudinal edge of the flexible spine material to a position corresponding to the desired width of the spine paper material, and continuing advancement of the spine material until a spine material of the desired width is present at a spine dispenser outlet and cross cutting the spine material at the spine dispenser outlet.