Abstract: A method and an apparatus for compensating for inking differences between setpoint color values and actual color values in offset printing presses having at least one inking unit and a control computer. The control computer controls the printing speed of the offset printing press and the temperature control of rollers in the inking unit of the offset printing press. The control computer is set up in such a way that, if an inking difference is detected between the setpoint color values and the actual color values, a combined control operation including a change in the printing speed and the temperature in the inking unit is performed in order to compensate for the inking difference. A printing press having the apparatus is also provided.

Abstract: A method and a system for producing a printing form for a printing process on a printing press, produces a first printing form based on first image data and prints a printing image on a printing substrate with the printing form. Printing presses without inking zones do not permit regulation of quantitative ink supply with inking zones screws. To permit a printer to manipulate ink density on a printing substrate even after exposure of a first printing plate within a printing press without inking zones, correction values are generated in the vicinity of the printing press in regions on the basis of at least a printing image printed on the printing substrate. The correction values are then used for correcting printing originals on which printing is based and/or screened image data and at least one second printing form is produced on the basis of at least the correction values.

Abstract: A sheet-fed offset printing press prints multiple colors on both sides of sheets, preferably on sheets of paper. A first row of in-line printing units print a first side of the sheet, before the sheets are turned in a reversing device, which is followed by a second row of in-line printing units for printing the other side of the sheets. The second row of in-line printing units is followed by one or more varnishing units that are arranged in such a way or include varnishing blanket cylinders that are arranged in such a way that the front sides and the back sides of the passing sheets are varnished.

Abstract: A method and an apparatus for compensating for inking differences between setpoint color values and actual color values in offset printing presses having at least one inking unit and a control computer. The control computer controls the printing speed of the offset printing press and the temperature control of rollers in the inking unit of the offset printing press. The control computer is set up in such a way that, if an inking difference is detected between the setpoint color values and the actual color values, a combined control operation including a change in the printing speed and the temperature in the inking unit is performed in order to compensate for the inking difference. A printing press having the apparatus is also provided.

Abstract: A method and an apparatus for reducing web tension change during intermittent driving of a transfer film in a film transfer unit, include severely impairing the web tension by contact sections before and after a transfer nip of the film transfer unit as the transfer film runs through a channel at the transfer nip. In order to reduce the web tension changes, front and/or rear guide elements before and after the transfer nip are moved time-asynchronously in relation to one other in order to at least reduce web tension fluctuations of the transfer film as it passes through the transfer nip.

Abstract: A method and a system for producing a printing form for a printing process on a printing press, produces a first printing form based on first image data and prints a printing image on a printing substrate with the printing form. Printing presses without inking zones do not permit regulation of quantitative ink supply with inking zones screws. To permit a printer to manipulate ink density on a printing substrate even after exposure of a first printing plate within a printing press without inking zones, correction values are generated in the vicinity of the printing press in regions on the basis of at least a printing image printed on the printing substrate. The correction values are then used for correcting printing originals on which printing is based and/or screened image data and at least one second printing form is produced on the basis of at least the correction values.

Abstract: A sheet-fed offset printing press prints multiple colors on both sides of sheets, preferably on sheets of paper. A first row of in-line printing units print a first side of the sheet, before the sheets are turned in a reversing device, which is followed by a second row of in-line printing units for printing the other side of the sheets. The second row of in-line printing units is followed by one or more varnishing units that are arranged in such a way or include varnishing blanket cylinders that are arranged in such a way that the front sides and the back sides of the passing sheets are varnished.

Abstract: A device for transporting a sheet for a sheet-processing machine in a processing direction includes first grippers for gripping the sheet at a leading gripper edge, as viewed in the direction of processing, the first grippers revolving in a first direction during operation. Also provided is a cylinder bearing the first grippers, and having a support surface formed at the circumference thereof for supporting the sheet gripped by the first grippers.

Abstract: A method for preventing limit values from being exceeded in sheet-fed printing machines includes acquiring values relevant to the printing process with respect to individual sheets, and processing those values so that predetermined limit values are maintained, detecting the development trend of a relevant value in the course of a series of sheets, and initiating measures when a change in the values occurs that would lead to a limit value being exceeded in an additional predetermined number of sheets if a continuation of the trend occurs; and a device for performing the method.

Abstract: A device for detecting the position of a printing plate on a plate cylinder of a printing machine includes path measuring systems corresponding with one edge of the printing plate.

Abstract: A method for preventing limit values from being exceeded in sheet-fed printing machines includes acquiring values relevant to the printing process with respect to individual sheets, and processing those values so that predetermined limit values are maintained, detecting the development trend of a relevant value in the course of a series of sheets, and initiating measures when a change in the values occurs that would lead to a limit value being exceeded in an additional predetermined number of sheets if a continuation of the trend occurs; and a device for performing the method.

Abstract: A device for transporting a sheet for a sheet-processing machine in a processing direction includes first grippers for gripping the sheet at a leading gripper edge, as viewed in the direction of processing, the first grippers revolving in a first direction during operation. Also provided is a cylinder bearing the first grippers, and having a support surface formed at the circumference thereof for supporting the sheet gripped by the first grippers.

Abstract: An adjusting device for a gripper opening cam in a chain delivery of a sheet-fed printing press, the gripper opening cam being pivotally guided in a bearing and being connected by a linkage to one of a pair of threaded nuts of a combination of a lefthand and righthand thread of an adjusting shaft screwable into a fixedly supported other threaded nut of the combination, includes an adjusting motor with an electrical program controller programmable for adapting to parameters which vary as the printing press rpm runs up to and runs down from operating speed for automatically tracking the gripper opening cam, and a coupling operative in the adjusting device, the coupling being disposed between the adjusting motor and the gripper opening cam.

Abstract: A device for adjusting guide yokes in rotary printing machines which are placed on a crossbeam crosswise to the direction in which the sheets travel, and which guide the sheets that are transported by a cylinder; each of the guide yokes are mounted, movable and lockable, on the crossbeam, and the crossbeam is at both ends fastened to the machine side racks.

Abstract: A control device for a numbering and imprinting unit of a rotary printing press is taught. The unit has a numbering cylinder removably mounted in the printing press side frames and is engageable, via eccentric bearings, at an impression cylinder. The unit has an inking unit for inking printing elements disposed on the numbering cylinder. The inking unit is designed as a removable unit. The control device has a control shaft and switching elements for engaging and disengaging respectively the numbering cylinder, for switching numbering units, and for adjusting the respective paper thickness to be processed, with the individual switching operations on the numbering and imprinting unit being optimized and effected independently of the offset printing machine.

Abstract: A printing press has at least one printing stand with a plate cylinder, an inking unit for providing ink to the plate cylinder, a blanket cylinder, an impression cylinder, a sheet feed device for feeding printing stock into the print stand, and a dampening unit for feeding dampening medium to the printing plate of the plate cylinder. The dampening unit has at least one form roller engageable with the plate cylinder, a dipping roller dipping into dampening medium contained in a dampening-medium tank, at least one intermediate roller provided between the form roller and dipping roller, adjusting means through which the form roller is engageable with the plate cylinder and the intermediate roller with the form roller and the dipping roller, and a device for preventing any permanent deformation on the elastic outer cylindrical surface when the printing press is at a standstill.

Abstract: A pregripper configuration in a sheet-fed rotary printing press feeds single sheets to a rotating cylinder. A cam drive includes a main cam and a roller lever which pivots about a frame-fixed shaft. A lever mechanism, which is articulated to the roller lever and a pregripper pivot arm, transmits the motion of the cam-following roller lever to the pivot arm. The pivot arm is also pivoted about a frame-fixed shaft. In order to compensate for play in the lever mechanism, a pretensioned spring is disposed between an attachment point on the roller lever and an attachment point on the pivot arm. In one embodiment, the pretensioned spring extends approximately parallel to a rigid link connected in articulated fashion between the roller lever and the pivot arm. In another embodiment, the spring is attached to a compensating cam drive.

Abstract: Table cover in the vicinity of a positionally adjustable side lay of a sheet-fed printing press includes a member defining a continuous surface of a table top extending over a distance corresponding to a range of width of a sheet format adjustable by a selective positioning of the side lay, the member defining the continuous surface being formed with flexible regions, and with regions yieldable to the side lay at all positions of the side lay.