Abstract: A device for positioning a cross cut relative to printed images on at least one printing material web in a web-fed press having at least one printing unit, includes a cross cutter. Also included is a computing device for generatingtherein at least a first control signal for changing a phase angle of the printing unit and the cross cutter relative to one another. A path length variation device for changing a path length through which the printing material web runs between the printing unit and the cross cutter is also included. The computing device further serves for generating a second control signal for changing the path length and, by interaction of the change in the relative phase angle and the change in the path length, serves for adjusting the positioning of a cross cut on the printing material web. A web-fed printing press includes the cross-cut positioning device. A method for operating the device is also provided.

Abstract: A device for positioning a cross cut relative to printed images on at least one printing material web in a web-fed press having at least one printing unit, includes a cross cutter. Also included is a computing device for generating therein at least a first control signal for changing a phase angle of the printing unit and the cross cutter relative to one another. A path length variation device for changing a path. length through which. the printing material web runs between the printing unit and the cross cutter is also included. The computing device further serves for generating a second control signal for changing the path length and, by interaction. of the change in the relative phase angle and the change in the path length, serves for adjusting the positioning of a cross cut on the printing material web. A web-fed printing press includes the cross-cut positioning device. A method for operating the device is also provided.

Abstract: A turning bar for changing the direction of a running web or ribbon of paper exiting a printing press. The turning bar is defined by an axisymmetric cylindrical wall having two half surfaces, one half surface having air blow-holes distributed therealong. The turning bar includes a device for blocking the air blow-holes which includes a plurality of flexible membranes and a corresponding plurality of maneuvering handles. The flexible membranes have the shape of an axisymmetric cylindrical sleeve and are arranged inside the turning bar and distributed one after the other over the entire length of the turning bar. The maneuvering handles are arranged on the cylindrical half-surface opposite the blow holes of the turning bar, each maneuvering handle having one end disposed inside the axisymmetric cylindrical wall of the turning bar which is securely fastened to a flexible membrane allowing each flexible membrane to occupy two positions.