Abstract: A rotary screen printing device includes a printing cylinder rotatably mounted about a printing cylinder axis. A cylinder jacket of the printing cylinder is formed at least in areas by a printing screen. An impression cylinder is rotatably mounted about an impression cylinder axis. A squeegee is movable relative to the cylinder jacket of the printing cylinder. The squeegee is arranged at least partly inside the printing cylinder for pressing printing ink through the printing screen onto a substrate to be printed. At least one adjustment device is provided for adjusting a distance between the printing cylinder axis and the impression cylinder axis or a radius of the printing cylinder or of the impression cylinder.

Abstract: A method and a device is used for reducing vibrations on at least two rotating elements, such as cooperating cylinders, which roll in opposite directions while situated in contact with each other. At least one of the elements has a surface protrusion that projects from an essentially circular contour of an active lateral surface. A height of this protrusion can be altered in a radial direction. A circumferential position of the protrusion can also be altered, all in accordance with a quality that characterizes a machine state or vibration.

Abstract: Flexural vibrations are reduced in rotating components, such as rotating cylinders of a rotary printing press. One or more actuators are placed in a groove or recess in the cylinder. These actuators act in the axial direction of the rotating component. The amount of force exerted by said actuator will vary with the rotational position of the cylinder.

Abstract: Rollers and cylinders that are useable in a rotary printing presses are made using hollow tubular casings having metallic foam cores. The casings and cores are made separately. The cores are then placed inside the casing and the two are secured in a force-transmitting manner.

Abstract: A printing unit is comprised of at least one counter-pressure cylinder and a transfer cylinder. A printing point is formed between the two cylinders when they are in contact. The counter-pressure cylinder is actuated by one drive motor independently of the transfer cylinder. In a print-on position, the counter-pressure cylinder is adjusted as a guide variable in relation to the power of the motor which drives the cylinder.

Abstract: The tension of a web in a rotary printing machine is monitored and adjusted. The web runs through at least one printing group in the rotary printing machine. Any change in the stretch of the web during the production run is determined by noting any difference between first and second speeds of the web. The change in stretch is compensated for by a change in the tension of the web before the first printing group.

Abstract: The circumferential register of a web passing through printing units of a web-fed rotary press is accomplished by determining an actual value of the tension in the web. An angular position or an angular velocity of a cylinder of a first print unit, with respect to a cylinder of a second print unit, is varied based on this determined tension. This corrects any register offset without the need to control web tension and without the use of an optical recognition system. The value of the needed change for the cylinder angular position or velocity is determined as a function of the measured tension of the web.

Abstract: The invention relates to a method for operating a pressure unit comprising at least one counter-pressure cylinder (03) and a transfer cylinder (04) forming a pressure point therewith. The counter-pressure cylinder is mechanically actuated by means of a first drive motor (06) independently from the transfer cylinder. In a pressure-on-position, the counter-pressure cylinder is adjusted as a guide variable in relation to the power of the motor which drives the cylinder.

Abstract: The invention relates to a method for controlling a circumferential register in a web-fed rotary press, according to which an actual value pertaining to a tension (51-55) of a web (03) passing through the printing units (04, 06, 07, 08) is determined, and an angular position and/or an angular velocity of a cylinder (12, 16) of a first printing unit (04) with regard to a cylinder of a second printing unit (06) is changed according to this determined tension. The correction of a register offset ensues without controlling the tension (51-55) and without the use of an optical recognition system by determining the value of the necessary change for the angular position (&dgr;&phgr;) and/or the angular velocity (&dgr;&phgr;) as a function of the measured tension (51-55) of the web (03).

Abstract: A method for adjusting a color register in a web-fed rotary printing press is accomplished by measuring an actual web tension and comparing it to a reference value for the web tension. If the actual web tension exceeds the reference value by more than a permissible tolerance either the number of revolutions of one of two print positions or the cylinder positions of one of the print positions is changed.

Abstract: Rollers and cylinders that are useable in a rotary printing presses are made using hollow tubular casings having metallic foam cores. The casings and cores are made separately. The cores are then placed inside the casing and the two are secured in a force-transmitting manner.

Abstract: The invention relates to a method for adjustment of a belt tension in a rotary press machine, whereby the belt (B) runs through at least one printing group (06, 07, 08, 09) and a change in the stretch of the belt during the production run is determined by means of a change in the difference between a first speed (u 09) and a second speed (u 11). The change in the stretch is compensated by a change n the tension of the belt before the first printing group (06).

Abstract: Flexural vibrations are reduced in rotating components, such as rotating cylinders of a rotary printing press. One or more actuators are placed in a groove or recess in the cylinder. These actuators act in the axial direction of the rotating component. The amount of force exerted by said actuator will vary with the rotational position of the cylinder.

Abstract: Rollers and cylinders that are useable in rotary printing presses are made using hollow tubular casing having metallic foam cores. The casings and cores are made separately. The cores are then placed inside the casing and the two are secured together in a force-transmitting manner.

Abstract: A printing press cylinder for a rotary printing press is light in weight and has vibration dampening properties. A metal foam filling is placed inside the cylinder.

Abstract: Rollers and cylinders that are useable in rotary printing presses are made using hollow tubular casings having metallic foam cores. The casings and cores are made separately. The cores are then placed inside the casing and the two are secured together in a force-transmitting manner.

Abstract: A process for adjusting a web tension in a web-fed rotary printing machine addresses the problems of processing variables which are not precisely quatifiable, while minimizing the influence of the press operator. This is achieved by adjusting the web tension using rules of fuzzy logic.

Abstract: The fan-out effect of a paper web, passing through a web-fed printing press having a plurality of printing units, is corrected by providing control assemblies before selected ones of the printing units. The control assemblies each have a number of control elements and counter control elements. The number of control and counter control elements in each assembly varies with the moisture content of the paper web passing through the web-fed printing press.