Abstract: An adjusting apparatus and method for a folding-unit cylinder is disclosed. The apparatus includes a linkage which can be set longitudinally by an adjusting drive which is arranged in the folding-unit cylinder. An adjusting member is articulated on the output side of the linkage and is mounted so as to be rotatable about the axis of the folding-unit cylinder and actuates the members which guide folded products.

Abstract: The invention provides a method for determining parameters relevant to the print quality of a printed product. A macroscopic photogram of a measuring field of the printed product is recorded using a camera having a macro lens. An actual value of a parameter relevant to the print quality is determined from the macroscopic photogram. The actual value is compared to a nominal value of the parameter relevant to the print quality. Whether the measuring field is printed with adequate quality is determined based on the comparison of the actual valve with the nominal value of the parameter relevant to the print quality.

Abstract: For more efficient and energy-saving drying of ink and/or coating films in printing machines, the drying or hardening process must be better monitored. Therefore a method is proposed for determining the degree of hardening of one or more printed ink and/or coating films on a substrate that was coated in an intaglio, flexographic or offset printing process. The degree of hardening or drying due to the hardening or drying process is determined indirectly via the change of mechanical and/or viscoelastic properties of the ink and/or coating films on the substrate. An ultrasound measurement is used for this purpose.

Abstract: In a method for determining the degree of hardening or drying of one or more printed ink and/or coating film(s) on a substrate, for instance, paper, cardboard, plastic film or composite materials, a faster and more efficient measuring method can be found that furthermore supplies secure and easily interpreted results. The method is to be used in the mass production printing processes comprising intaglio printing, flexographic printing, screen printing or offset printing. The degree of hardening or drying is determined indirectly by way of the change in the mechanical and/or viscoelastic properties of the ink and/or coating films on the substrate that result from the hardening or drying process. The detection of acoustic waves by means of a piezoelectric sensor is used as the measuring method.

Abstract: A device and method for determining the web tension or the web tensile force in a printing substrate web is disclosed. A device is arranged at a first position along a transport path of the printing substrate web, which device supplies a signal to deduce the web tension in effect at the first position or the web tensile force in effect at the first position. A device arithmetically determines the web tension in effect or the web tensile force in effect at the second position from the web tension in effect at the first position or from the web tensile force in effect at the first position as well as from forces, which at least one driven roller and/or at least one trailing roller, which is/are arranged along the transport path of the printing substrate web between the first position and the second position, introduce to the printing substrate web.

Abstract: A printing unit of a web-fed printing press is disclosed. The printing unit includes four printing couples where each printing couple includes a plate cylinder, a transfer cylinder, an inking system as well as, if applicable, a dampening system. The transfer cylinders of every two printing couples arranged horizontally next to one another which form a printing couple group, form a nip, through which a to-be-printed printing substrate can be conveyed. The center points of the transfer cylinders (rolling off one another) of every printing couple group each lie on a horizontally running line. Two printing couple groups offset from one another in the vertical direction are also offset from one another in the horizontal direction such that the print positions as well as the center points of the transfer cylinders and the plate cylinders of the printing couple groups are offset from one another in the horizontal direction.

Abstract: A printing unit of a web-fed printing press having several printing couples is disclosed. Each printing couple includes a plate cylinder, a transfer cylinder, an inking system as well as, if applicable, a dampening system. Two printing couples respectively arranged vertically one above the other form a printing couple group and are assigned a common safety device in order to cover hazardous areas on the respective printing couple group. The safety device is translatorily displaceable at least in sections in order to free up or block access to the printing couples of the printing couple group.

Abstract: A damping unit for a press has means for applying a damping solution to a printing form and means for setting the quantity of damping solution applied. At least one sensor is provided for registering the quantity of damping solution actually applied to the printing form. By means of a comparison with a predefined quantity of damping solution, the quantity of damping solution on the printing form can be regulated.

Abstract: An apparatus and method for cleaning guide rollers of a printing unit, particularly a 9-cylinder satellite printing unit, of a web-fed printing press, is disclosed. A cleaning device having a cleaning body fastened to an actuating grip is insertable between the guide rollers of the printing unit. A cleaning cloth that can be wetted with cleaning fluid can be fastened to the cleaning body, and the cleaning body features cleaning surfaces on opposing sides that are adapted to the contour of the guide rollers.

Abstract: A satellite printing unit of a web-fed printing press with printing couples is disclosed. Each printing couple includes a plate cylinder and a transfer cylinder where the transfer cylinders of all the printing couples roll off a common impression cylinder. Each plate cylinder features a high lockup slot and a low lockup slot and each transfer cylinder has a lockup slot. The transfer cylinders of the printing couples are aligned relative to the plate cylinders of the printing couples such that, on a first group of printing couples, which includes at least one printing couple, the lockup slot of the respective transfer cylinder rolls over the high lockup slot of the respective plate cylinder and on a second group of printing couples, which includes at least one printing couple, the lockup slot of the respective transfer cylinder rolls over the low lockup slot of the respective plate cylinder.

Abstract: A device for transferring an image-forming layer from a transfer film to a printing sheet, including an applicator unit for applying a coating of glue in the form of an image to the printing sheet; and a coating unit including an impression cylinder for guiding the printed sheet with the coating of glue facing away from the impression cylinder, and a pressure roller for guiding the transfer film with the image-forming layer facing away from the pressure roller. The impression cylinder and the pressure roller form a transfer gap therebetween so that the transfer film and the printing sheet are pressed against each other when guided through the transfer gap so that the image-forming layer remains adhered to the printing sheet in the area of the coating of glue and is lifted off from the transfer film after leaving the transfer gap. A process is also disclosed.

Abstract: A process for the production of a printing form, especially within a printing press, where a permanent and erasable image is provided on the rewritable surface of a printing form by means of the following steps: (a) the preparation of a printing form with a rewritable surface; (b) the all-over application of a rubber coating to the rewritable surface of the printing form; (c) the image data-oriented removal of the previously applied rubber coating; (d) the image data-oriented application of an imaging polymer to the surface in the areas from which the rubber coating was previously removed; and (e) the all-over fixation of the imaged surface.

Abstract: A method for coating a printing press cylinder, namely a plate cylinder or a transfer cylinder, is disclosed. In an embodiment, the method includes providing a printing press cylinder with a metallic cylinder basic body, which has an outer surface area and at least one lockup slot, and applying a coating containing nickel to the cylinder basic body in the region of the outer surface area as well as in the region of the, or each, lockup slot by autocatalytic and/or chemical deposition.

Abstract: An image fixing device inductively injects thermal energy into a rotating printing form of a press for fixing an image formed on the rotating printing form by means of a digital imaging system. The fixing device has at least one inductor with at least one induction loop, a high-frequency part that forms a tuned circuit with the inductor, and a supply part that can be coupled to the inductor by means of supply lines suitable for high frequency. The inductor loop is in an elongated form aligned parallel to the circumferential direction of the rotating printing form, with the effect that the zone of energy transfer and therefore the heating zone can be configured specifically in terms of its spread in the printing form, so that a high flux density can be introduced zonally into the printing form at the point which is to be heated.

Abstract: A webbing apron of a device for webbing up a printing substrate web in a printing press, namely a web-fed printing press, is disclosed. The webbing apron includes a cable, which is used for engagement of a tension element that is embodied in particular as a chain, and a flat element, where the flat element wraps around the cable at least in sections and is connected to the cable. The flat element is embodied of fluorinated rubber and the cable is permanently connected to the flat element made of fluorinated rubber by vulcanization.

Abstract: A method for controlling cut-off registration in a printing press having printed webs includes applying print control marks which are invisible to the human eye to the printed webs; passing the webs pass through cut-off register control actuators; assembling the webs into a bundle for cut-off; scanning the webs with sensors to determine the actual positions of the marks; comparing the actual positions with desired positions of the marks; and generating signals for the cut-off register control actuators based on the comparison.

Abstract: An apparatus and method for changing a printing plate of a printing unit of a printing press is disclosed. A printing unit of a printing press, in particular a web-fed printing press, has at least one printing couple, where the, or each, printing couple includes a plate cylinder, a transfer cylinder, an inking system as well as, preferably, a dampening system. Each printing couple is allocated a printing plate changing device for executing a partially automatic or fully automatic printing plate change on the plate cylinder of the respective printing couple. The plate cylinder of each printing couple can be displaced between two positions in such a way that in a first position the plate cylinder is engaged on the inking system and disengaged from the printing plate changing device and in a second position is engaged on the printing plate changing device and disengaged from the inking system.

Abstract: An apparatus and method for cleaning a webbing-up device in a printing press is disclosed. A webbing-up device for webbing up a printing substrate web in a printing press, namely in a web-fed printing press, includes a finite conveyor chain, which is made up of several chain segments that are connected to one another in an articulated manner, and which is guided into a chain guide rail. A cleaning device, which is detachably connected to the conveyor chain, is allocated to at least one end of the finite conveyor chain.

Abstract: A printing plate cartridge for a press including a housing having an old printing compartment for holding a printing plate to be removed during a printing plate change and a new printing plate compartment for holding a printing plate to be mounted on a form cylinder of a press during a printing plate change. A printing plate to be mounted on the form cylinder is removable from the new printing plate compartment via a first opening for feeding to the form cylinder during a printing plate changing operation. A printing plate to be removed from the form cylinder is capable of being fed to the old printing plate compartment via the first opening during a printing plate changing operation.

Abstract: A folding-jaw cylinder of a folder for a printing press is disclosed. Actuable folding-jaw cheeks are assigned to a first cylinder part of the folding-jaw cylinder and fixed folding-jaw cheeks are assigned to a second cylinder part. Both cylinder parts are assigned one shaft, via which the cylinder parts can be driven rotationally. An intermediate gear is coupled on one side to a drive and on the other side to at least one actuating unit in such a way that the intermediate gear can be driven by the drive and inputs its drive into at least one of the shafts of the cylinder parts via the, or every, actuating unit, and the, or every, actuating unit is assigned an adjusting drive in order to adjust the two cylinder parts, and therefore the folding-jaw cheeks which are assigned to the cylinder parts, relative to one another.