Abstract: A temperature-control device particularly for an offset printing machine for at least two separate liquids in the machine. Dampening solution circulates in a first liquid circulation circuit to printing plates or the like receiving the dampening solution. A first heat exchanger communicates with a cold generator and the first liquid circulation circuit passes through a first heat exchanger. The second cooling solution of the printing machine cools parts of the machine and is in a second liquid circulation circuit. The second liquid circulation circuit passes through the second heat exchanger. After passing through the first heat exchanger, the first liquid circulation circuit also passes through a second heat exchanger, whereby heat is exchanged between the first and second liquid circulation circuits. The second liquid circulation circuit includes a controllable bypass for selectively bypassing the second liquid past the second exchanger.

Abstract: A method and apparatus for the contact-free removal of dirt in the form of residues of ink, fibers and dust on rotating cylinders in a printing machine by means of a laser beam which is directed onto the surface to be cleaned.

Abstract: A temperature control device for rotating bodies in printing mechanisms. It contains a blowing device having an internal air recirculation circuit for the recirculation of cold air which has been deflected from the rotating body which is to be cooled. A cold air generator is arranged outside the blowing device and is connected for flow to it via a cold air feed line. In this way, energy for the production of cold air is saved and the cold air feed line can have a smaller cross section since only a reduced amount of cold air need be fed.

Abstract: A printing machine spray device for moistening surfaces of cylinders, rolls, rollers which are rotating around a transverse axis of the machine and/or for moistening the material being printed which is moving in the longitudinal direction of the machine. The liquid is sprayed by two sprayers onto the surface to be moistened while the two sprayers are being moved in respective opposite directions transversely over the surface. Each sprayer starts from a different respective longitudinal side of the machine. Controls determine the on-off delivery of spray, the speed of sprayer motion, the starting positions of each of the sprayers and may adjust these for machine parameters. Automatic dosing of a specific quantity during one spraying is provided. The input to a sprayer may be from one of selected sources.

Abstract: A temperature control system for printing press cylinders. It contains at least one compressed-air line (18) having at least one blast-air opening (20) for blowing cold air against a cylinder (6) which is to be cooled. At least one recirculation circuit (30, 32, 34, 36, 28) which is separate from the cold air of the compressed-air line (28) and by which air which has been blown by the blast-air opening (20) onto the cylinder is drawn off by means of a blower (28) contained in the recirculation circuit and is blown parallel to the cold air again onto the cylinder (6). In this way, the temperature of the cold air (22) can be active, without prior change of temperature, on the cylinder (6). The cold air deflected by the cylinder is returned to the cylinder (6) for additional cooling.

Abstract: An apparatus to apply cleaning fluid to a cylinder of a rotary printing machine with a controlled supply to the exit openings of a distributor device, from which the cleaning fluid can be sprayed on the cylinder with a specific time and space distribution. Guide elements to dam the jet are provided in front of and behind the region of the spray jet so as to limit this region toward the outside. The guide elements are attached to the distributor device and bridge over the distance between the distributor device and the convex surface of the cylinder, while forming narrow gaps between the guide elements and the convex cylinder surface. There is a flow labyrinth at least in the downstream gap.

Abstract: A system for keeping the surface (4) of a rotating cylindrical printing plate (6) of a printing press at a moderate temperature. A cooling air blower girder (2) extends longitudinally over the printing plate surface (4) and blows cold air onto the printing plate surface (4), in order to keep its temperature at a desired value. The blast-air girder (2) contains at least one heat exchanger (52) and at least one blower (60) as well as at least one air-return duct (20, 22), which together forms a cooling air cycle, through which the air, blown onto the printing plate surface (4), is returned to the air inlet of the heat exchanger and, optionally mixed with fresh air, blown by the blower (60) once again through the heat exchanger (52) onto the printing plate surface (4). The blast-air girder (2) represents an energy-saving, compact structural unit for keeping the printing plate surface (4) at a moderate temperature.

Abstract: An apparatus for cleaning cylinders of a rotating drum printing machine has a cleaning cloth, which can be unwound, and a contacting body. The cleaning, which otherwise is carried in fixed time regions, for which precisely dimensioned cloth sections can be made available, is changed to a measure, which is carried out with an alternating contacting pressure of the contacting body and a quasi continuous advance of the cloth. In the contacting zone, the cloth is taken hold of directly and pulled. An oscillating mechanism, which is preferably realized pneumatically, is provided for the alternating contacting pressure.

Abstract: A recirculating coating liquid supply system for continuous delivery of a supply of coating liquid to a coating apparatus includes a holding tank carrying coating liquid mixture, a main feed line having an intake at the holding tank and a discharge at an applicator trough associated with the coating apparatus. A branch of the main feed line discharges into the holding tank. The system also includes a return feed line having an intake at the applicator trough and a discharge at the holding tank. Pumps are associated with both the main feed line and the return line and a viscometer is connected to measure the viscosity of the coating liquid mixture flowing through the main feed line. Viscosity adjustments are made by infusing measured quantities of coating liquid base or coating liquid thinner into the main feed line.

Abstract: A system for keeping the surface (4) of a rotating cylindrical printing plate (6) of a printing press at a moderate temperature. A cooling air blower girder (2) extends longitudinally over the printing plate surface (4) and blows cold air onto the printing plate surface (4), in order to keep its temperature at a desired value. The blast-air girder (2) contains at least one heat exchanger (52) and at least one blower (60) as well as at least one air-return duct (20, 22), which together forms a cooling air cycle, through which the air, blown onto the printing plate surface (4), is returned to the air inlet of the heat exchanger and, optionally mixed with fresh air, blown by the blower (60) once again through the heat exchanger (52) onto the printing plate surface (4). The blast-air girder (2) represents an energy-saving, compact structural unit for keeping the printing plate surface (4) at a moderate temperature.

Abstract: A sheet-cleaning apparatus for cleaning a sheet (6) that is to be printed, before it runs into the printing mechanism (2) of a sheet-fed printing press. A backing cloth (20), which is contacted with the sheet (6) that is to be printed with the help of the positioning means, is used to clean the sheet (6) that is to be printed. A transporting apparatus (26, 24, 28) transports the backing cloth (20), so that other moist sections (32) of the backing cloth (20) are consecutively brought into contact with the sheet (6) that is to be printed.

Abstract: This invention relates to a process and apparatus for cleaning the rubber blankets of a rotary offset printing press while the web is running. The cleaning agent used to remove ink and paper residue from the rubber blanket is partially transferred to the web and passed to the dryer. At an advanced stage of the printing run, where we can observe a rise and subsequent drop in the ink residue curve paralleled by a corresponding curve for the cleaning solution load, undesirably high fume release levels may occur. These fume levels may, on one hand, be controlled via the cleaning program. On the other hand, it is possible to adjust these fume levels by influencing the fume release through the application of a suitable agent to the web surface. The application of this material will inhibit the fume release and alter the component moieties in the fumes while additionally permitting the released components to be sealed off. The material utilized is predominantly water.

Abstract: A continuous drier for drying a printed web on web-fed rotary printing presses operates during ongoing printing and blanket washing processes with control of the gaseous and vaporous constituents of the ink, solvent, and burner gases. An infrared beam path is installed in the drier to measure concentrations of gas vapors in the drier by an extinction method. The continuous drier process is thus controlled according to the rate of evaporation of volatile constituents. The infrared extinction measurement yields spectral measurements of vapors released by the printing ink during the printing process, or of solvent constituents released during the blanket cleaning process, each according to their characteristic band position and intensity. During the transition from printing to blanket washing, the user obtains an instant picture, based on the band intensities, of the current vapor concentrations.

Abstract: In the case of a printing press having an impression cylinder for cooperation with at least one transfer cylinder, such as a blanket cylinder, for applying a printing image to a web, a higher degree of quality and greater ease of operation are made possible by having a wiping device with a wiping cloth for engaging the impression cylinder and possibly a bend roll. The wiping device is arranged to act on a part of the periphery of the impression cylinder not having the web of paper trained about it.

Abstract: To effectively counteract any deformation of the pressing roller of a rubber blanket cleaning device for offset printing machines, a cleaning blanket is passed over the pressing roller and a blanket is brought into contact with the rubber cylinder. To improve the cleaning process, a pressing roller support is arranged at the periphery of the pressing roller, whose outer contour can, in non-loaded state, pass by the roller-side surface of the pressing roller support free from pressure and play. The pressing roller support is positioned parallel to the axis of the pressing roller and approximately diametrically opposite to the arc region, while coming into contact with the pressing roller of the rubber cylinder.