Abstract: A rotary press includes a plurality of cylinders including plate cylinders arranged to perform printing. Each of the plate cylinders is supplied with ink through an inking unit which is associated with the plate cylinder. The inking unit is composed of at least one of form rollers, an ink metering roller which is in contact with an ink metering doctor blade, and a fountain roller partially dipped in an ink fountain pan. At least one of the inking units further includes an intermediate roller interposed between the upperstream side of the form roller(s) and the downstream side of the metering roller when the ink fountain pan is located above the plate cylinder to be supplies with ink through the inking unit. The intermediate roller can freely change the revolving direction of the metering roller so that the ink metering doctor blade can be arranged at any proper position where is no obstruction to adjust the contact angle of the doctor blade onto the mesh roller and repair or replace the doctor blade per se.

Abstract: A low cost, disposable, unitized dampening roller/dampening cover component consisting of a hollow tube on which is fixedly bonded a resilient layer and with a moisture absorbent cover fixedly bonded on the resilient layer. The tube is fitted with supportive injection molded end caps for mounting the roller/cover component as an integral component on a lithographic press. This all in one construction allows for fast and easy changing of dampening covers.

Abstract: Keyless lithographic printing system with single printing fluid. A lithographic printing press has a blanket cylinder (101) and a plate cylinder (102) with a printing plate (100) mounted thereon, a form roller system (103) having at least one form roller rotationally contacting the plate cylinder (102), a printing fluid supply system for supplying a controlled composition of printing fluid to the form roller system (103). A reservoir system (110, 124, 126, 107, 128) is provided for containing the printing fluid, the printing fluid being a predetermined composition of dampening water and ink. A pickup roller (106) removes the printing fluid from the reservoir system, the pickup roller (106) having an oleophilic and hydrophobic surface. A drum roller (104) transfers the printing fluid to the form roller system (103), the drum roller (104) having an oleophilic and hydrophobic surface and interfacing with the form roller system (103).

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.

Abstract: A dampening water controller for controlling the concentration of an etching solution in dampening water circulatively used in offset printing, includes an ion concentration measuring means capable of measuring the concentration of at least one kind of ion (object ions) selected from specific anions or cations contained only in an etching solution in dampening water. Information on the measured concentration of the ions in the dampening water is output. A dampening water temperature measuring device capable of measuring the temperature of the dampening water and outputting information on the measured temperatures is provided. Also, an ion concentration information correcting device is provided capable of correcting the information on the measured concentration of the ions in the dampening water, in accordance with the information on the measured temperature of the dampening water.

Abstract: An offset printing apparatus provides good adhesion of ink onto the roller of the feeding route by efficiently fractionizing the dampening fluid supplied to the ink device. An ink device has an ink feeding route including an ink metering roller and an ink storage device whose distance toward the revolving direction of the upstream roller of said ink feeding route gradually decreases.

Abstract: An anilox offset printing unit includes a short inking device mounted between side walls with a screen roller which can be doctored and immersed in an ink reservoir, an inking roller, and a plate cylinder for inking a rubber blanket cylinder, and a damping device acting on the plate cylinder. An adjusting device having two degrees of freedom serves to adjust the distance between the axes of the inking roller and the screen roller and/or the distance between the axes of the inking roller and the plate cylinder, wherein the adjustment is carried out by the adjusting device in accordance with a measurement value determined by a measuring element which interacts with the adjusting device.

Abstract: A device for coupling and uncoupling inking unit and dampening unit drives in rotary printing machines is actuated with an operator-accessible control knob mounted at a printing unit. A sensor assembly detects a safety rest or safety release movement of the control knob preceeding a switching movement of the control knob. A control shaft is connected to and rotatable by the control knob. A cam member with a cam surface is mounted on the control shaft. The cam surface is followed by sensing devices which continuously sense the cam surface. A traverser bushing is axially movably mounted in the printing unit. Transmission members are connected between the control knob and the traverser bushing for converting a switching movement of the control knob to an axial movement of the traverser bushing. The axial movement of the traverser bushing is between defined positions which cause the inking and/or dampening unit drives to be engaged and disengaged.

Abstract: A self-oscillating roller assembly (10, 10A, 10B, 10C, 10D) with an oscillating shaft (54) mounted on translational bearings (58, 60) to slide along a stationary shaft (48) and with a rotary shaft (55) mounted to the oscillating shaft (54) on rotational bearings (80, 82) to provide rotational movement. A key assembly (62, 63, 64, 66) restrains the relative longitudinal movement between the oscillating shaft (54) and the rotary shaft (55) while a pair of springs (68, 70) provides bias to return the rotary shaft (55) and oscillating shaft (54) to a preselected home position.

Abstract: A short inking unit for an offset rotary printing unit that has a dampening fluid system includes at least a first additional pair of rollers. A first roller of this first additional roller pair contacts a forme cylinder and a second roller of this first additional roller pair engages the ink forme cylinder. Second and third additional roller pairs may be used. Each additional roller pair is positioned either on the dampening system side of the printing unit or on the side of the printing unit opposite the dampening system.

Abstract: Method for regulating a supply of dampening solution in an offset printing press having a printing plate includes supplying at least one selected region of the printing plate with a well-defined amount of energy; determining and measuring scumming occurring in the selected region; comparing the measured scumming in the selected region with a prescribed scumming matched to the respective supplied amount of energy; and adjusting the supply of dampening solution, if the measured scumming and the prescribed scumming deviate from one another; and a device for performing the method.

Abstract: A method for maintaining, without using alcohol, a uniform film of dampening fluid on a lithographic printing press dampening roller. Said roller comprises a resilient surface with grooves helically formed about the roller surface. Said roller is positioned in a pressure indented relation to a smoothly finished transfer roller having a hydrophilic surface, creating an area of differential pressure along said grooves at the point of contact, or nip, between the rollers. Upon rotation of the rollers, excess water is transferred to the low pressure regions near the grooves of the nip and then to the end of the roller where it is returned to the dampening fluid pan.

Abstract: A damping roller for the damping unit in a printing press has a roller body that carries a glass, glass ceramic, or enamel outer material, layer, or coating. Suitable coatings can be produced, for example, by enamelling, plasma spraying, or attaching the outer layer to the body with a sealing compound. In another embodiment, the glass, glass ceramic, or enamel material acts as the self-supporting roller member accommodated solely by the journals. Preferably, the outer surface of the roller is polished. The damping roller of the invention has the ability to dispense an optimum amount of damping medium while eliminating or reducing damping medium additives such as alcohol to less than 6% of the total mixture.

Abstract: To permit elimination of dampening rollers or an entire dampener in a lithographic, preferably offset printing machine, the printing form is formed as a cylindrical sleeve or jacket (3) fitted over a core (2), in which the cylindrical sleeve or jacket is formed with a plurality of interconnected pores (5), essentially uniformly distributed over the surface (4) and forming, within the sleeve or jacket, a connected pore fluid transfer network. Dampening fluid is then applied to the interior of the sleeve or jacket, for example from a chamber (6) between the cylindrical core (2) and the inner surface of the sleeve or jacket. The outer surface (4) can be imaged with oleophilic substances, for example by a thermal transfer process. To remove the images, for re-use of the printing form without removal from a printing machine, hot gases for example steam can be applied to the interior of the sleeve or jacket, so that the oleophilic substances at the outside will loosen for easy removal, or spall off.

Abstract: A lithographic press includes a plate cylinder having an outer surface which includes a first outer section and a second outer section, and at least one printing plate disposed around one of the first and second outer sections in parallel to a rotational axis of the plate cylinder. The other of the first and second outer sections is uncovered and exposed to the ambient environment. The lithographic press also includes an ink supplying device which feeds ink to the at least one printing plate and the other of the first and second outer sections, and an ink removing device having a contact member which contacts the other of the first and second outer sections of the plate cylinder and removes ink therefrom. A method for removing ink from the other of the first and second outer sections includes removing the ink by way of contact between the ink removing device and the other of the first and second section of the outer surface of the plate cylinder.

Abstract: A roller shifting device for a printing press comprises first support means for supporting a form dampening roller for shifting the form dampening roller relative to a surface of a plate on a plate cylinder between a first contacting position and a second released position, second support means for supporting a transfer roller for shifting the transfer roller relative to the form dampening roller between a first contacting position and a second released position, third support means for supporting another roller other than the transfer roller and to be contacted with and released from the form dampening roller for shifting the another roller between a first contacting position and a second released position, means for cooperating the first, second and third support means for synchronous shifting between the first and second positions, means for differentiating a shifting stroke and/or direction of the tfirst support means from those of the second and third support means, and actuating means associated with on

Abstract: Disclosed is a printing machine for corrugated board sheets, which is designed to facilitate the procedures of ink change in accordance with order changes in the printing of corrugated board sheets by using a low viscosity and quick-drying glycolic ink, in which the residual ink of the previous order can effectively be recovered so as to minimize the amount of the ink to be wasted.

Abstract: An offset lithographic printing press has a source of ink (40), a source of dampening liquid (42), and a first means for transferring and emulsifying ink and dampening liquid. The first means includes a plate cylinder (12) for carrying a printing plate (18). A second means (96 or 150) is selectively actuatable while the plate cylinder (12) is rotating and transferring the image from the printing plate (18) to the material being printed (24). The second means (96 or 150), when actuated, causes the first means to emulsify ink and dampening liquid to minimize undesirable amounts of dampening liquid on the printing plate (18). A third means (100 or 200) selectively actuates the second means (96 or 150) when undesirable amounts of dampening liquid are present on the printing plate (18).

Abstract: The present invention discloses a universal chemical system for offset printing comprising a plate coating, a fountain concentrate solution, an alcohol replacement solution, a roller coating, and a plate wash. The system uses the same types of chemicals throughout to achieve a system compatible throughout. The plate coating comprises deionized water, citric acid, sodium phosphate dibasic, gum arabic, magnesium nitrate solution, glycerine, and propyl alcohol. The fountain concentrate solution contains water, citric acid, sodium citrate, sodium phosphate dibasic, sodium benzoate, gum arabic, glycerine, ethyl hexandiol, and erio green B supra. The alcohol replacement solution contains deionized water, diethylene glycol, propasol P, glycerine, and dowanol PM. The roller coating contains deionized water, citric acid, disodium phosphate, gum arabic, glycerine, and propyl alcohol. The plate wash contains water, citric acid, dowanol EB, dowanol PM, maphos 8135, phosphoric acid, and erio glaucine a supra.

Abstract: A sealing device (10) for a printing press (11) having a base (12) defining a chamber (24) for retaining ink, a roller (14) mounted on the base (12) over the chamber (24) with the chamber (24) communicating with the roller (14), and a sealing member (20) having a surface (46) for contacting the roller (14), with the sealing member (20) being constructed from a porous material (49) and having a fluid impervious barrier (56 and 58) extending over at least one side (48 and 50) of the sealing member (20) to prevent passage of ink through the sealing member (20).

Abstract: A dampening system has a pan for containing dampening fluid, and transfer and metering rollers for bringing dampening fluid up out of the pan. A transition roller contacts one of the transfer and metering rollers. The transition roller is movable between first and second positions. In the first position, the transition is off of the plate cylinder and dampening fluid is applied to the plate cylinder by ink form rollers. In the second position, the transition roller is on the plate cylinder. Another version of the dampening system has a bridge roller between the transition roller and a ink form roller, which bridge roller is movable between third and fourth positions. In the third position, the bridge roller is on the transition roller. In the fourth position, the bridge roller is off of the transition roller. The dampening system can dampen the plate cylinder without the use of alcohol. The transition roller is rotated by a separate motor so that its speed is controlled independently of the other rollers.

Abstract: A brush-type dampening unit in a rotary printing machine, includes at least one revolving carrier member having a multiplicity of brush bristles arranged thereon a pan roller dipping at least partly into a dampening-fluid pan, and revolving in a direction opposite to that of the carrier member, adjusting means for adjusting the position of the carrier member with respect to the pan roller, the revolving carrier member and pan roller having respective separately controllable drives independent of a drive of the printing machine, and means for zonally metering a quantity of dampening fluid over the width of the machine, as well as for influencing a direction of movement of the dampening fluid.

Abstract: A dampening fluid evaporator for a lithographic printing press which incorporates an elongated transflow blower which is mounted to be driven by a roller in the inking system. The blower is formed by a plurality of impeller segments mounted end to end.

Abstract: A film dampening system for a rotary offset press has a pan roller (101) rotated by a variable speed electric motor (111), the pan roller being covered with a hydrophilic material and being partially immersed in a trough (107) containing dampening solutions; an elastomer-covered metering roller (102) rotating at a speed related to the speed of the pan roller (101); a dampening drum (103) fitted with hydrophilic material; and an elastomer-covered dampening roller (104) in contact with the dampening drum (103) and with the plate cylinder (105) of the press.

Abstract: Apparatus for controlling the wetting behavior of the surface of a cylinder formed of passivatable metal. A wetting device is used to apply an electrolyte to the surface of the metal cylinder. A direct current source is connected between the wetting device and the cylinder and a control device is used to control the voltage necessary for passivating the surface of the cylinder as a function of the pH value of the electrolyte and the type of metal forming the surface of the cylinder. The oleophilic or oleophobic characteristics of the cylinder are thus controlled.

Abstract: A sealing device for a dampening unit on an offset printing press having a channel for receiving a dampening-solution supply and defined by a dampening-solution applicator roller and a metering roller which roll on one another, and having a seal holder mountable on a side part of the dampening unit and being in contact engagement with a sealing element, closing off one end of the channel, the sealing element having formed with an overflow opening for excess dampening solution, comprising a drain passage located between the sealing element and the seal holder and formed by a cutout on a side of the sealing element facing away from the channel, the cutout being connected with the overflow opening.

Abstract: The improved automatic dampening water replenisher has two flow sensors that respectively measure the flow rates of stock solution and diluent water which are to be mixed to prepare dampening water with which the tank of dampening water is to be replenished, and this enables the concentration of dampening water in its tank to be maintained within a predetermined range at all times. If desired, the apparatus (the replenisher) may be equipped either with components for computing, displaying and storing the total flows of stock solution and diluent water or with an emergency alarm generator which issues an alarm indicating the occurrence of aberrations in the concentration of dampening water in its tank. This offers the advantage that normal operation of the apparatus can be resumed as soon as power failure is remedied, or the suspension of water supply and other troubles can be readily identified and corrected to avoid unwanted variations in the concentration of the dampening water.

Abstract: A printing press (10) with a roller mounting assembly (14) for mounting a form roller (16) and a transfer roller (22) to an axle (20") of a drum roller (20) to rotate therewith by means of a bracket assembly (44) which oscillates both the form roller (16) and the transfer roller together (22) relative to the drum roller (16) and a plate cylinder (18) while permitting rotation of a form bracket (46) carrying the form roller (16) to adjust the pressure of the form roller (16) against the plate cylinder (18) but locking the transfer roller (22) against such rotary movement by means of a link (66) between the transfer bracket (48) securing together the transfer bracket (48) and an oscillating piston member bracket (52) and a post (62) carried by the oscillating piston bracket (52) restrained to slide within a slot (64) in a base bracket (58) which is fixedly secured against any movement.

Abstract: The invention relates to a rotary printing press, particularly offset printing press, the printing unit of which comprises a printing form, a damping unit as well as an inking unit, said inking unit being provided with a set ink profile. In order to obtain a fast change of ink profile, it is proposed that, in order to eliminate the previous ink profile and to prepare the buildup of a new ink profile, the printing form 32 is inked over its entire surface area with the inking unit 1.

Abstract: A printing press having an inking unit and a wetting unit, which cooperate with a printing form by means of an inking roller and a wetting roller, having a control device for moving the wetting roller into an engagement or disengagement position with respect to the printing form. To expedite simple handling in the application of another substance onto the printing form, the wetting roller is supplied with the another substance by an apparatus provided therefore and moved into its engagement position with respect to the printing form by a control apparatus.

Abstract: A design of dampening system safety cover comprising sustantial, transparent materials and the construction possibly utilizing a singular body design, along with a deliberate manner of extending and angling certain members to enhance safety, while still permitting adaptation of the new cover to the existing dampening system by employing existing hardware, providing both complete visual access, and operant isolation from the functional contents of the system.

Abstract: A dampening system has a pan for containing dampening fluid, and transfer and metering rollers for bringing dampening fluid up out of the pan. A transition roller contacts one of the transfer and metering rollers. The transition roller is movable between first and second position. In the first position, the transition is off of the plate cylinder and dampening fluid is applied to the plate cylinder by ink form rollers. In the second position, the transition roller is on the plate cylinder. Another version of the dampening system has a bridge roller between the transition roller and a ink form roller, which bridge roller is movable between the third and fourth positions. In the third position, the bridge roller is on the transition roller. In the fourth position, the bridge roller is off of the transition roller. The dampening system can dampen the plate cylinder without the use of alcohol. The transition roller is rotated by a separate motor so that its speed is controlled independently of the other rollers.

Abstract: The present invention describes a device for moving rollers and in particular rollers of a printing press in two independent directions. Movement in each direction is independent of movement in the other direction. The roller has trunnions which are mounted in roller locks. The roller locks are then mounted on a frame of the printing press. Mechanisms inside the roller lock position the roller lock in one direction with respect to the frame and other mechanisms inside the roller lock position the roller in another direction with respect to the roller lock. This mechanisms are independently controlled and movement of one mechanism is independent of the movement of the other mechanism. By independently controlling these mechanisms the roller can be engaged, disengaged and adjusted with respect to the frame or any components mounted on the frame.

Abstract: This roll mounting assembly (100) for mounting an anilox roll between opposed sideframes (12) includes an anilox roll (120) and opposed end bearings (124). Each sideframe (12) includes an open ended flanged slot (130) receiving an associated bearing (124) at each end and a screw clamping assembly (140) is disposed at the other end of the slot (130) to apply a predetermined pressure to bearing (124) through the medium of a clamping pad (148).

Abstract: An auxiliary drive for the ductor roller of a sheet-fed offset press continues to advance the ductor roller in small angular steps during press stoppages. The damping unit drive which continues to run during press stoppages drives the ductor roller stepwise by way of an eccentric drive linkage and a ratchet wheel disposed on the ductor roller journal. When the press is running, a rocker lever in the drive linkage can be pivoted away from the throw zone of the eccentric for example, by a piston actuated by oil pressure of the press's oil supply system. In alternative embodiments, the lever arm can be pivoted away by a compressed air cylinder or a suction cylinder which become operative when the press is running.

Abstract: An improved lithographic dampener of the type having continuous plate/form roller/metering roller contact, adaptable to a variety of press configurations and operating speeds, employs a friction-driven oscillator roller that distributes added dampening liquid and the ink/liquid emulsions on the metering roller, to avoid continuing patterns which might cause ghosting in printed images. The dampener has a simple drawer-like configuration, with an open front for improved range of form roller/plate contact. A pan with a remote supply of dampening liquid, is located under the rollers such that the metering roller surface contacts and picks up liquid from a pool in the pan. Simplified seal dams at the ends of the form/metering rollers' nip keep the reservoir of liquid in that nip, yet minimize wear of the seal configuration. A slide block mounting of the metering roller and oscillator rollers allows independent adjustment of pressure at the form/metering rollers' nip, and at the metering/oscillator rollers' nip.

Abstract: A dampening system for a printing press uses a dampening fluid spray system to apply dampening fluid to a first of several serially arranged transfer rollers. The dampening fluid is carried by these transfer rollers to a dampening forme roller and then to a plate cylinder. The surfaces of the dampening forme roller and the several transfer rollers after the first such transfer roller are oleophilic. Spaced levers adjustably support several of the transfer rollers and the dampening forme roller.

Abstract: A dampening system for a lithographic printing press is provided in which the source of water is separate from the dampener rollers and all the dampener rollers have surfaces that possess both oleophilic and hydrophobic properties.

Abstract: A friction roller for the inking or moistening unit of a printing press, the roller axle of which is mounted on the side frames of the printing press, and the roller body of which is driven through frictional engagement by the inking or moistening unit roller, the roller body executing a to-and-fro movement on the roller axle in its rotation, in such a manner that the lateral stroke movement of the roller body can be controlled and executed with any desired frequency.

Abstract: A doctor blade head assembly, particularly for use in a flexographic printing press, has a head body pivoted to a support frame with an inflatable air tube disposed therebetween. The air tube extends along a channel having a bottom formed with spaced apart raised portions which cause the air tube to bulge out at these locations. In this way the air tube essentially only presses against the head body at these spaced apart locations, for example at the center and adjacent the ends, which reduces the tendency of the head body to bend along its length. This provides a more uniform ink film on the ink roll being inked by the doctor blade head assembly. End seal arrangements at the ends of the head body each include a resilient block seal and a resilient pad seal with which greased edge portions of the doctor blades slidably engage. The doctor blades overhang the ends of the ink roll, and an ink outlet passageway extends through each end seal arrangement independently of the seals.

Abstract: This roll mounting assembly (10) for mounting a meter roll between opposed sideframes (12) includes a meter roll (20) and opposed mounting blocks (28) each receiving a journal end (22) of the meter roll (20). The mounting blocks (28) are pivotally mounted to associated sideframes (12) by retractable pivot pin assemblies (30) for swinging movement of the roll (20). Threadedly adjustable members (50) are pivotally mounted to the sideframes (12) and are engageable with the mounting blocks (28) to adjust the location of the mounting blocks (28), and therefore the meter roll (20), to swing the meter roll (20) into and out of engagement with an anilox roll (120).

Abstract: Dampening unit for an offset printing machine includes a metering roller, a dampening form roller for applying dampening medium to a plate cylinder of the printing machine, the metering roller and the form roller being in mutually pressing engagement at a contact zone along respective axially parallel lines on respective casings of the rollers, a drive for rotating the metering roller and the form rolelr with circumferential speeds which are substantially in a downward direction in vicinity of the contact zone, a storage space for dampening medium located above the contact zone and defined by surfaces of the casings of the metering roller and the form roller and sealing elements located at respective ends of the metering roller and the form roller, and a traversing distributor roller disposed in direct friction contact with the metering roller.

Abstract: Adjustment means for engaging, disengaging and adjusting inking and damping rollers are provided in the inking and damping units of offset printing machines. The printing machine includes inking rollers supported on cam rollers which bear on cam discs situated axially parallel to the plate cylinder inside an arcuate housing. The cam discs are interconnected in such manner that they can be adjusted individually and they are also connected to the housing so as to be adjustable jointly. The housing is also pivotally connected to an adjustment drive by means of which it can be moved peripherally relative to the plate cylinder bearing to effectuate the engagement and disengagement position of the inking rollers.

Abstract: A reversible printing unit is equipped with a central distributing roller (9), with which a first transfer cylinder (8) and a second transfer cylinder (12) can be engaged or disengaged independently from one another. A respective dampening mechanism (10) and (24) is associated with each of the transfer cylinders (8) and (12). Depending on the direction of rotation or the mode of operation of the printing unit, the transfer cylinders (8) or (12) and the rollers following them act as dampening rollers or inking rollers. Modes of operation with indirect dampening, pre-inking of the inking mechanism with feed of dampening agent, and rapid and thorough washing of the rollers of the inking and dampening mechanism are also possible due to the independent adjustment of the respective transfer cylinders (8) and (12).

Abstract: A low-inertia, fast-acting servo motor (40) coupled through a gear to a fountain roll (20) of an inker is controlled and energized by an electronic control unit (45). The control unit controls acceleration of the fountain roll (20) during the period of time when a ductor roller (21) is in contact therewith, from speed 0 to the required speed which is necessary to rotate the fountain roll (20) about a predetermined angle (.phi.s) which, for example, is between 0.degree. and 90.degree.. During the second half of the ductor roller cycle (T), that is, when the ductor roller (21) is separated from the fountain roll (20) and in engagement with an ink transfer roller (22) of the inker, the angular speed of the fountain roll is braked to zero speed. The system permits remote command of the angle of rotation (.phi.s) of the fountain roll (20) during the half cycle (T/2) of the ductor roller (21) as the ductor roller oscillates at a speed depending on printing press machine speed.

Abstract: A method of determining dampening-medium feed in an offset printing machine includes inking a printing plate of the printing machine so that tinting of areas of the printing plate which are normally ink-free during a production-run process occurs, and feeding a defined quantity of dampening medium and increasing dampening-medium feed, respectively, while detecting a process of ink taking from the tinted areas, which is applicable as a measurement for the dampening-medium feed being adjusted; and a device for performing the method.

Abstract: Roller for distributing at least one of an ink and a wetting agent in a printing press. The roller has a generally uniform roughness of about fifteen micrometers to about twenty micrometers over its entire exterior surface.

Abstract: A dampening fluid evaporator for a lithographic printing press incorporating a blower housing having an elongated inlet passage positioned to extend along substantially the entire length of a distributor roller. A transflow blower mounted in the blower housing draws air through the elongated intake passage along substantially the entire length of the roller while delivering a diffused stream of air which impinges against the roller for evaporating excess dampening fluid.

Abstract: A selective drive for a metering roller in a damping unit of an offset printing press which enables the metering roller to be driven by the damping fluid fountain roller without peripheral slip during the joint washing of the damping unit and inking unit. The gearwheel drive producing the peripheral slip can be selectively brought into and out of operation by the meshing of two intermediate gears being interrupted and restored by a lever which carries the metering roller and one intermediate gear being pivoted by an actuating cylinder around the axis of the damping unit fountain or ductor roller.

Abstract: An offset printing press having a wetting unit and an inking unit which has an ink metering device to set an ink profile, the inking unit and the wetting unit each having at least one applicator roller which can be moved into a position in contact with a printing plate mounted on a plate cylinder. To generate an ink profile which is very close to that required for the printing run and to reduce waste, the applicator rollers are moved by a control apparatus into a position of contact with the printing plate during the establishment of the ink zone profile which occurs before the beginning of printing, or during a jam or a blanket washing process which interrupts the printing process. A corresponding process is also described.