Abstract: A damping unit box for a damping unit of an offset printing machine, which box includes an inner basin-shaped wall and an outer basin-shaped wall that are separated by a heat insulating space to form a double-wall structure.

Abstract: The invention relates to an apparatus for generating proofs of print signatures composed of first and second flats printed on opposite sides of a sheet comprises first and second digital printing units; a feeder mechanism for feeding a substrate having opposite sides to the first printing unit; a first input for feeding to the first printing unit digital data representative of an image of the first flat to imprint one side of the substrate with the image of the first flat; a marker for providing the substrate with a registration mark at a predetermined location on the substrate; a conveyor for conveying the imprinted substrate from the first printing unit to the second printing unit and feeding same thereto; and a mark sensor for detecting the location of the registration mark on the substrate and causing actuation of the second printing unit.

Abstract: An ink dosing device in the inking unit of rotary or offset printing press is disclosed with an inking roller which corresponds to an ink fountain. The ink dosing device also has dosing elements which are divided into zones. The dosing elements can be adjusted individually with respect to the cylindrical surface of the inking roller. The dosing elements are realized as tongue-shaped and are fastened to a base body. Each dosing element is adjustably fastened to the base body by elastic intermediate shims.

Abstract: A method and apparatus are proposed for cleaning the ink chamber (27) of the ink rail (11) of a printing machine ink supply system and from whch ink is delivered to an ink roller through a multiplicity of side-by-side stepped feed holes (29) in the rail (11) , the method and apparatus utilising a plug (41) freely slidable within the chamber (27) and adapted to purge the chamber (27) of ink present in advance of the plug (41) on its movement longitudinally of the chamber. In analogous manner the plug (41) may be used to effect a colour change as between ink sources provided at opposite ends of the rail. (FIG. 2).

Abstract: An inking apparatus for rotary printing machines includes a rotatably mounted, drivable ink roller and at least one ink container mounted such that it can be swivelled away from the roller, favoring cleaning and ink change. The swivelably mounted ink container permits the ink container to be emptied in an operator-friendly fashion avoiding ink residues to the greatest possible extent and also permits thorough cleaning of the ink container and the roller with good accessibility. The roller is mounted in a separate holder and the holder is mounted in the frame in such a way as to be swivelable separately from as well as together with the ink container.

Abstract: A method of controlling a vibrator roller in a printing press during printing press stops and printing starts is disclosed. The cycle of the vibrator roller is controlled as a function of the point of time at which the vibrator roller contacts the ink fountain roller, in order to achieve a uniform inking after a printing press stop.

Abstract: An inking unit for a printing machine, including an ink duct with a scoop cylinder partly dipping into ink received in the ink duct, further includes zonally acting metering elements for setting on a provided cylinder selected from a group thereof consisting of the scoop cylinder and another cylinder, an ink distribution corresponding to a printing image, the metering elements being individually convertible between two metering states, at least one transfer cylinder for transferring ink, which has been set on the provided cylinder by the metering elements, onto a printing form, a drive for rotating the scoop cylinder and further cylinders, and a control device connected to the drive and the metering elements, the metering elements being arranged above the level of the ink in the ink duct, so that two ink layer thicknesses differing from one another are producible in circumferential direction, over the width of a metering element, by the metering elements, respectively, in the two metering states, on the provi

Abstract: A dampening assembly (10) for a printing press (12) having a spray bar (16) and source (18) of a liquid (L). The system (10) has a pressure regulator (22) being connected to the source (18) through a first conduit (20), and being connected to the spray bar (16) through a second conduit (24). The system (10) has an accumulator (26) having a chamber (28) being separated into first and second compartments (32 and 34), with the first compartment (32) being closed and being charged with an inert gas (G), and the second compartment (34) being connected to the second conduit (24). The system 10 has a third conduit (38) being connected between the second conduit (24) and the supply (18), and having a flow restriction orifice (40) restricting the flow of liquid (L) between the second conduit (24) and the source (18).

Abstract: A multi-color web-fed rotary printing press is arranged having a plurality of printing groups with each group having several individual printing units. Each printing group has an upright drive shaft that is connected to a drive motor for each of the several printing units in the group. The several upright drive shafts are connected to a longitudinal main drive shaft. The individual drive motors and the upright shafts are sized to be able to take over the drive of one of the printing units in a printing group should its motor fail.

Abstract: An inking unit in a rotary printing press includes an ink fountain with a ductor blade, a ductor roller disposed adjacent the ink fountain, and one or more ink fountain pans removably disposed in the ink fountain. The ink fountain pan is formed with a duct through which printing ink is conveyed to the ductor roller. The duct is selectively closed and opened with a closure device, which includes a closure member pivotally mounted on the ink fountain pan. The closure member thereby pivots between a first pivot position in which the duct is open and a second pivot position in which the duct is closed.

Abstract: The present invention relates to a method and apparatus for normalizing the zero points for each ink key in an ink fountain. The method and apparatus are useful in an ink fountain using an inker roll and a meter roll which are spaced by a gap, which gap can have possible variations in width. The method is performed when an operator programs the ink fountain controller with a reference point corresponding to the position of the ink key where ink is first transferred from the inker roll to the meter roll - - - the zero points for the ink keys. The reference points for all the ink keys are then normalized within the ink fountain controller, such that an operator display shows a uniform value for the individual reference points for all the ink keys.

Abstract: In order to enable a rotary press having a plurality of printing units capable of printing on a paper web drawn out of a roller sheet of paper to operate in an increased working efficiency, to be saved in space and to be small sized, there is provided a construction thereof in which a space is provided which is substantially identical to a space that is required to accommodate a single roll of paper of a predetermined diameter, in each of one half or less (3) of the said plurality of printing units; a means (30) is provided for supporting, in the said substantially identical space, a plurality of rolls of paper (W21, W22) each with a diameter that is smaller than the said predetermined diameter, the said means being operable so that the said plurality of rolls of paper may be joined together in succession automatically; and further there is provided, in the said substantially identical space and at a site that is adjacent thereto, a means (50) supported on the said supporting means (30) for joining the said p

Abstract: An inking apparatus for a printing press includes an ink supplying unit, an ink form roller, an oscillating roller, and an ink ductor roller. The ink supplying unit has an ink fountain for storing an ink, and an ink fountain roller having a circumferential surface on which a film of the ink supplied from the ink fountain is formed. The ink supplying unit supplies the ink on the circumferential surface of the ink fountain roller to an ink transfer line for a plate cylinder. The ink form roller supplies the ink, supplied from the ink supplying unit through the ink transfer line, to a plate mounted on the plate cylinder. The oscillating roller is disposed along the ink transfer line between the ink fountain roller and the ink form roller to reciprocally move in an axial direction.

Abstract: A coating head device for coating an engraved surface on a coating cylinder of a printing press having a main body with a longitudinal cavity for liquid, open to the coating cylinder and substantially sealable to the coating cylinder. The cavity has an injection zone providing for a zone pressurizing the liquid within a portion of said cavity in the main body to compel liquid into cells in the engraved surface of the coating cylinder. The main body has an inlet to provide liquid to the supply chamber and a return to exhaust liquid from the outlet section.

Abstract: Method of stabilizing the temperature of a duct roller in an inking unit of a printing press, the duct roller being formed with an interior space through which a temperature-controlled fluid flows, includes feeding oil from an oil circulation system of the printing press through the interior space of the duct roller and back to the oil circulation system for stabilizing the temperature of the duct roller; and device for performing the method.

Abstract: An offset printing system includes an improved inking unit for applying ink to a rotatable plate cylinder, wherein the inking unit appreciably reduces the production of contaminants. In particular, the inking unit one or more ink application rollers that adjacently contact the plate cylinder. A series of rollers are in ink communication with these application rollers, including at least one inking roller in direct contact with the ink application rollers, and at least one inking roller in indirect inking communication with the ink application rollers. The inking rollers are driven in a positively locking manner and which are drivable at a peripheral speed that differs from the peripheral speed of the plate cylinder, and the inking roller furthest from the plate cylinder is driven with the greatest peripheral speed differential relative to the plate cylinder.

Abstract: An inking arrangement for printing presses comprises an ink fountain member having at least one fountain-forming face for forming an ink fountain, an ink fountain roller defining an ink channel together with the fountain member and having an outer peripheral surface to be inked through the channel, a plurality of rollers for supplying the ink applied to the peripheral surface of the fountain roller to a printing portion, and a cleaning tank disposed below the fountain member. The cleaning tank is provided with a cleaning blade at least alternatively shiftable to a cleaning position in which the blade is pressed against the peripheral surface of the fountain roller, or to a stand-by position in which the blade is away from the fountain roller. The ink applied to the peripheral surface of the fountain roller through the channel is scraped off by the blade in the cleaning position and collected in the tank.

Abstract: A device for alignment of images for a control system of a printing press having a device for creating targets, a device for aligning a camera, a device for finding actual dot positions on at least one of the targets, a device for calculating the desired dot positions, a device for generating transfer functions, and a device for aligning the images.

Abstract: An improved offset printing press includes microcontrolled continuous film dampening units in combination with a water take-up roller, a dampening distributor roller, and a dampening form roller of a conventional offset printing press. The microcontrolled continuous film dampening units replace alternating feed dampening units of the conventional offset printing press. A removable module of the improved printing press includes a regulator roller, transfer roller, a dampening distributor roller, and liaison roller.

Abstract: An inking unit for printing presses, preferably offset printing presses, can have a plurality of plate-inking rollers for inking a plate cylinder along with a multiplicity of inking rollers. The inking rollers can be positioned to supply ink flow, in at least two directions to the plate-inking rollers. The inking rollers and the plate-inking rollers can then form a closed chain of rollers, and can enclose a space therebetween. A measuring device can be provided to monitor the temperature of the air within this space, with measured values being used for control of the temperature of the inking unit.