Abstract: A control system (10) for a four-color printing press (11) having a device (21) for detecting the energy reflected from a paper surface in both the visible region and the infrared region of the electromagnetic spectrum, a device (23) for converting the output of the detecting device (21) to a set of variables which represent the amount of ink presented on the paper for any of the cyan, magenta, yellow, and black inks, and a device (25) responsive to the converting device (23) for adjusting the four-color printing press (11) to maintain the color consistency with or without an additional color control target.

Abstract: A method for controlling inking during the printing process, in particular during the production run, in a printing press, the printing press having an imaging device coupled to a computing device operative for collecting image color measurement data from the imaging device, and numerically processing the image data, and in which color measurement data are obtained from printed images produced on an continuous basis, these data being used for control or regulation to influence image inking if a predetermined image color tolerance is exceeded, the method which comprises the steps of collecting the image color measurement data, over time using the image color measurement data for computing a color trend estimate; evaluating the color trend estimate and performing a corrective control of the inking if the color trend estimate data indicate that image coloring will move outside the allowable image color tolerance.

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: An ink supply unit for a receiving roller of a printing machine. The ink supply unit includes an ink rail mounted in close proximity to the surface of the receiving roller, and a plurality of ink reservoirs mounted one above the other in the ink rail that discharge differently colored inks in accordance with the printing requirements onto the surface of the receiving roller through a valve mechanism. Wiper rollers are mounted adjacent to the surface of the receiving roller to wipe the surface thereof to reduce ink wastage due to misting or the like. The inks are introduced onto the surface of the receiving roller and are mixed to form the required color for printing by the combined action of the wiper rollers and a roller train that links the receiving roller and the print roller in the printing machine.

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: In printing machines, especially offset printing machines, an ink profile is produced in the inking unit by means of adjustable dosing devices associated with respective ink zones. A proper production-run state is quickly realized by first implementing a filling process in which the dosing devices are moved into a first filling gap width across the entire breadth of the inking unit. Then the dosing devices are moved briefly into a transitional gap width which deviates more from the first filling gap width than that of the setting for the production-run ink profile. Thereafter, the dosing devices are moved into the setting corresponding to the production-run ink profile.

Abstract: A method for regulating inking when printing with a printing press, which includes, by means of at least one sensor element directed towards the surface of a recording carrier at a given measurement site, deriving actual-value signals from at least one physical variable representing the inking; comparing the actual value signals with reference-value signals for the physical variable at the same measurement site; deriving, in accordance with a prescribed principle, control signals for control elements for the physical variable from the comparison-value signals obtained, and feeding the derived control signals to a control element; and placing the actual value in a range of reference values by means of the control element and holding it there automatically; further includes acting upon the control elements with defined control signals during a startup phase of the printing press; obtaining actual-value signals from a multiplicity of measurement sites in the entire printed surface of the recording carrier; deter

Abstract: A method for positioning actuators inside printing machines is described. In particular, the positioning operations of metering elements, which serve to feed ink, moisture or varnish and interact with a rotating cylinder, are improved. To this end, the metering elements are automatically moved from time to time up to the rotating cylinder and the position resulting in the process is stored as a so-called zero position. The method according to the invention is intended in particular to ensure that the metering element is not set with too high a force relative to the cylinder during future positioning operations. This is done by motion commands being fed to the drive allocated to the metering element so that this drive moves the metering element in two areas, in which the metering element is contiguous to the cylinder and furthermore is in contact with the cylinder.

Abstract: A rotary printing press includes an inking unit with an ink fountain and an ink fountain roller. An ink fountain blade to be disposed in the ink fountain for scraping printing ink from the ink fountain roller includes a base body having a free end region to be associated with the ink fountain roller. The free end region has a plurality of slits formed therein for dividing the free end region zonally into a corresponding number of individual blades and defining zones of contact of the individual blades with the ink fountain roller. A hard-material coating is disposed on the base body in the zones of contact.

Abstract: The invention relates to a method and device for detecting ink or lacquer films on metallic surfaces inside printing machines. In particular, to irradiate the surface with light and sensing of the intensity of the reflected light to detect whether an ink film or lacquer film on a roller has been completely removed by applying a metering element or doctor-blade element. This is achieved according to the invention by the irradiation of the metallic surface or of the film located thereon, and the reception of the light reflected from the surface or the film located thereon is performed at the Brewster angle with respect to the surface normal, the Brewster angle being defined by the refractive index of the material of the film to be determined and that liner polarization of the light is performed at least partially in the plane of incidence, at least in one of the two beam paths.

Abstract: An ink fountain for offset or letterpress printing presses is taught. The ink fountain has an ink dosing device with dosing elements which can be set to zonally different ink gap thicknesses on an ink ductor roller. The dosing elements are covered by an elastic film. An ink chamber is closed on both ends with closures. The two closures are connected by a cross arm to which cross arm the elastic film is fastened.

Abstract: Doctor blade for an offset rotary printing press having an inking unit with an ink duct wherein the ductor blade is provided for, respectively, scraping ink from an ink duct roller and zonally metering an ink film layer thereon over the width of a web of printing material includes a ceramic coating disposed on an edge portion of the blade at a region thereof at which the ink duct roller is in contact therewith.

Abstract: An ink furnishing apparatus is capable of furnishing relative high viscosity ink in keyless ink furnishing. The apparatus operates in such a manner that an ink drawn from an ink fountain by rotation of a fountain roller and having a thickness corresponding to a first gap is supplied to the peripheral surface with compression by passing through a second gap, is provided fluidity by compression and disrupter through contact between the peripheral surfaces of an uneven surface roller and an intermediate roller and contact between the peripheral surfaces of the intermediate roller and a metering roller for supplying to the peripheral surface of the metering roller, the excess amount of ink on the peripheral surface of the metering roller is scraped off by a doctor means and returned to the ink fountain for supplying substantially uniform amount of ink at any axial position of the metering roller to a printing plate on a plate cylinder via the peripheral surface of the form roller.

Abstract: The offset printing machine comprises at least one flexible ink blade (14) which, angled in the direction of an ink roller (12), borders an ink bath (40) and can be bent in zones to different degrees against the cylindrical surface of the ink roller (12), and adjustment means for bending the ink blade edge (36). The adjustment means has tappets (92) axially displaceable in a guide and an adjustment cam (62) allocated to each, with the cam axis (L) parallel to the ink roller axis (A). The tappets (92), preferably individually adjustable length-wise, are pressed by springs (100) against the peripheral surface (72) of the adjustment cam (62). The self-locking positionable adjustment cams (62) are arranged alternately in the modular principle with bearing jaws (64) for their non-rotatable coaxial bearing bolts (60) on a mounting rail (56), for interchargeable mounting as a control unit (58) directly or via an adapter on an offset printing machine.

Abstract: A composite ink fountain blade for a printing press wherein the blade has a multiplicity of blade segments fixed between an upper cleaning plate and a lower support bar. Each of the segments is provided with smooth, ground or polished, machine finished, straight and parallel sides for sliding abutment against each other during the adjustment of an extending portion of the blade segments. Adjustment of the blade segments controls the flow of ink from the ink reservoir through the ink fountain blade first pickup roller nip.

Abstract: An industrial local area network module comprises a transceiver for supporting communication between the module and a communications network in a first data format. The module further comprises a parallel interface for supporting communication between the module and a respective embedded controller in a second data format. A microcontroller is provided for (i) controlling the orderly flow of messages between the module and the communications network through the transceiver and (ii) controlling the orderly flow of messages between the module and the embedded controller through the parallel interface. A memory stores program instructions to be retrieved by the microcontroller and then executed by the microcontroller to control the orderly flow of messages between the module and the communications network through the transceiver and to control orderly flow of messages between the module and the embedded controller through the parallel interface.

Abstract: A plurality of inking blade plates are positioned in abutting fashion between cooperating insertion and clamping strips to form an inking blade. A temperature differential is created between the blade plates and the strips which are then allowed to return to a common temperature. This creates a uniform spacing between each of the inking blade plates in the inking blade. The resulting inking blade is usable with an ink ductor roller in a rotary printing press.

Abstract: Offset printing method wherein ink in the form of screened half-tone dots or pixels and unscreened printing-image elements is applied to a printing surface of a recording medium by means of a printing device; a printing form being generated from signals reproducing a printed image; the printing form being inked with an inking device; and the ink being transferred to the printing surface, upon transport of the recording medium relative to the printing device; the signals being processed in a control device for the printing device; includes, near the printing device and before the printing form is generated on a screen or monitor, forming a copy of the printed image from the signals reproducing the printed image and from signals containing parameters of the printing device; whenever the copy deviates from a desired printed image, manually inputting correction values for local inking into the control device, until the copy corresponds to the desired printed image; and generating the printing form and adjusting t

Abstract: An ink furnishing apparatus for a printing press for performing printing by furnishing an ink to a printing plate on a plate cylinder is selectively operable in an entire surface ink furnishing mode, in which a first gap is held fully opened, the doctor means is placed in contact with the metering roller, ink drawn through the fully opened first gap in a thickness corresponding to the first gap by rotation of the fountain roller, is furnished in an excess amount of ink onto the peripheral surface of the metering roller, the extra amount of ink on the peripheral surface is scraped off by means of the doctor means contacting with the peripheral surface of the metering roller to return to the ink fountain, and the ink is furnished onto a printing plate in a plate cylinder via the peripheral surface of the form roller in substantially uniform amount over the entire position along the axis of the metering roller, and in a local ink furnishing mode, in which the first gap is adjusted to be narrower with respect to

Abstract: A metering device for use in a coating apparatus for coating a moving web running over a backing member wherein the metering device includes a metering blade having an edge disposed in close proximity to the web and a profiling device for selectively changing the profile of the blade edge. The profile bar is joined to a plurality of adjustment actuators by bar limiter elements that are mechanically interlocked such that the movement of each limiter element relative to an adjacent limiter element in the direction of bar deformation is limited to a maximum distance. The edges of adjacent limiter elements are provided with interfitted projections and slots with sufficient clearance to permit only limited relative movement of adjacent limiter elements.

Abstract: A method for regulating ink distribution in a printing machine is disclosed. In accordance with the disclosed method, a basic ink quantity and a compensating ink film thickness are determined for a printing plate to be loaded into the printing machine. All of the inking rollers of the printing machine are fed ink until the ink thickness on each roller is substantially equal to the compensating ink thickness. A steady state ink distribution within the printing machine will be attained relatively quickly, thereby minimizing print waste and time required to attain steady state.

Abstract: The conversion kit includes a pair of side frame mounting plates, one for each side frame of an older printing unit, wherein the mounting plates are mounted on the inwardly facing surfaces of their respective side frames after a cylinder, an ink fountain, and a doctor blade assembly of the printing unit are removed therefrom. The kit also includes a new ink fountain having an ink well positioned beneath the cylinder, and a sock roll for smoothing out ink on the cylinder and for impregnating engraved cells formed therein with ink. The ink fountain is mounted on and supported by the mounting plates. Also provided is an adjustable doctor blade assembly which is mounted on the mounting plates, the assembly having a doctor blade, and an actuating device for moving the doctor blade towards and away from the cylinder.

Abstract: A method for controlling the ink guidance of a printing machine, especially a sheet-fed offset printing machine. Ink-density spectra are recorded by means of a spectral photometer at a plurality of image points of the original and of the printed copy and the differential ink-density spectra are determined from these values. These differential ink-density spectra are then represented as a linear combination of the individual ink-density spectra of the inks participating in the composite printing. Regulating commands for the ink-guide members of the printing machine are thereupon derived from the proportionality factors of this linear combination.

Abstract: A doctor device, notably for machines used to coat paper or cardboard, with a relatively bendable, flexible doctor element fitted in or on a separate holder. At least along its length in the holder, the device features a convex crowning of its working surface about its longitudinal axis.

Abstract: An ink fountain apparatus for a printing press includes an inclined member with an ink supply adjusting member which is swingable about an axis parallel with the rotational axis of an ink fountain roller for movement between a first position where ink fountain is formed and a second position where the ink fountain is not formed. Piston rods of hydraulic cylinders are connected to the inclined member via a connection mechanism to move the inclined member between the first position and the second position. Stoppers are also provided to stop the inclined member at the first position. Springs are included in the connection mechanism to press the inclined member against the stoppers. The spring force produced by the springs is smaller than the force produced by the drive means. With this structure, the work load of an operator can be reduced while enhancing the efficiency and safety of his work.

Abstract: A method for controlling the ink feed of a printing machine, especially an offset printing machine, for printing four-color half-tone combined prints. In selected test regions in an original and in the corresponding test regions in the printed sheet, the standard color values of the four-color overprint are determined. The infrared color density for the black printing ink is determined in the near infrared. The standard color values of the four-color overprint are converted by means of a linear transformation into standard color values corresponding to the combined print of only the three chromatic colors. The coefficients of the linear transformation are determined empirically as a function of the infrared color density of the black printing ink. From the standard color values of the three-color print, the effective surface coverage values of the three chromatic colors are determined via the modified Neugebauer equations.

Abstract: In a method of controlling an ink supply amount for a printing press, values corresponding to image areas of a plurality of zones obtained by dividing a plate surface are read out as initial values. Correction amounts are obtained on the basis of the readout initial values and a current printing speed. The initial values are corrected using the obtained correction amounts to obtain correction values. Opening degrees of a plurality of ink fountain keys for adjusting ink supply amounts of the zones are controlled on the basis of the obtained correction values. An apparatus for controlling an ink supply amount is also disclosed.

Abstract: Paper or cardboard webs are coated by dipping an applicator roll in the liquid coating material and forming a uniform coating on that roll with a grooved doctor bar before applying the coating to the web against a drum. Thereafter, any excess is removed from the web by a doctor blade which is pressed against the web while it is on the drum.

Abstract: An ink fountain apparatus includes a plurality of ink blade segments which are arranged in a row extending in the axial direction of a ink fountain roller to form an adjustable ink supplying port between the ink blade segments and the peripheral surface of the ink fountain roller, and an adjusting mechanism provided for each of the ink blade segments to adjust the degree of opening of the ink supplying port. The adjusting mechanism includes a spring which forces the ink blade segment to retract away from the ink fountain roller, a press rod which contacts the rear end of the blade segment at its forward end and is provided with a cam follower facing toward the direction of retracting movement of the blade segment, and an end cam member which is rotatable about a rotational axis parallel to the direction of movement of the blade segment and has a cam surface which is in contact with the cam follower.

Abstract: In an applicator a thick coating of a liquid is applied to a flexible web that is then moved through a doctor assembly where excess liquid is scraped from the web. The doctor assembly has a generally stationary support at the station and a holder beam extending longitudinally substantially parallel to the web and transverse to a web travel direction. The beam is movable on the support transversely of itself and of the travel direction forward toward and backward away from the web and has a front face directed toward the web and an opposite back face turned away from the web. The support has front and back faces generally parallel to and respectively confronting the front and back faces of the holder beam. A doctor rod held in the holder beam is juxtaposable thereby with the web to scrape the excess liquid from the web. Front inflatable hoses are provided between the front faces of the holder beam and support and back inflatable hoses between the back faces of the holder beam and support.

Abstract: A knife designed as a flexible steel plate for the ink ducts of an offset printing machine has blades in the area of the working edge which can be bent differently in zones against an ink ductor by individually adjustable regulator elements. The multiple blade ink knife designed as an autonomous unit. It comprises two-part side jaws attached on both sides to a knife holder, each with an outer metal jaw and an inner plastic jaw which presses resiliently against the front of the ink ductor and the knife. This suitably has a groove, recessed at least in the area of the knife dipped into an ink bath, which is filled with an elastic sealant. At least the blades of a knife designed as a flexible metal plate, also an autonomous unit, are fully covered on the top with a flexible metal strip applied by adhesive.

Abstract: Method for zonally controlling and regulating inking in a printing machine having a plurality of printing units includes photo-electrically measuring, at least at one location of each inking zone, a printed product provided in the printing machine, determining an actual color locus from the measurements, comparing the determined actual color locus with a prescribed setpoint color locus of the respective location and, in the event of a spacing between the compared color loci, calculating corrective control data for inking elements of the printing machine and transmitting the control data to the printing units so as to minimize the spacing between the actual and setpoint color loci, the actual color locus meeting tolerance requirements by lying within a prescribed color tolerance and within a permissible region at a setpoint color locus characterized by an absence of color change; and device for performing the method.

Abstract: A coating device includes a plurality of parallel coating blade lamellae made from highly wear-resistant material. The lamellae are disposed against one another in a housing and held thereby, forming a lamella packet wherein each lamella of the packet is disposed at the same inclination with respect to a plane perpendicular to a longitudinal axis of the packet. The inclination of the lamellae is adjustably controlled by at least one adjusting device acting on the packet. Thus, a change in lamellae inclination also changes a step-wise configuration of a surface contour formed by neighboring lamellae of the packet.

Abstract: An ink fountain apparatus comprises a storage part for forming an ink storage space in cooperation with an external periphery of a fountain roller, the storage part including a bottom portion having a front edge which is opposed to the external periphery of the fountain roller with a gap defined by the front edge and the external periphery, the gap serving as an inc supplying port, an ink supply adjusting member arranged movably forward and rearward in contact/separation directions with respect to the fountain roller to adjust the degree of opening of the ink supplying port by means of the front edge of the ink supply adjusting member, a screw feeding mechanism for driving the ink supply adjusting member to move it forward and rearward, and stopper means for restricting the rotation of a rotation driving member of the screw feeding mechanism.

Abstract: In order to improve the operation of an ink fountain, particularly for web offset printing presses, an ink fountain assembly is disclosed which includes a fountain roller and a fountain blade assembly which is positioned in operatively associated relation to the fountain roller. The fountain blade assembly has a fountain base with a key supporting surface and aim has a plurality of ink keys on the key supporting surface of the fountain base to extend substantially along the length of the fountain roller in variably spaced confronting parallel relation to the fountain roller. With these features of construction, the ink fountain assembly includes an alignment system for maintaining each of the ink keys in parallel relation to the fountain roller and a drive system for controlled movement of each of the ink keys toward and away from the fountain roller.

Abstract: Device for detecting a position of an actuator on a printing press includes two potentiometers having respective wipers connected to the actuator and driven with mutually different transmission ratios, the two potentiometers being serially connected in a measuring circuit, and an evaluation device connected to the measuring circuit for receiving signals therefrom corresponding to measuring-circuit voltages of the potentiometers and for determining therefrom the position of the actuator.

Abstract: Ink duct for offset or letterpress printing machines having an ink-metering device by which a respective ink gap is adjustable zonewise in axial direction of an ink-duct roller, wherein the ink-metering device includes metering elements and an elastic foil covering the metering elements, the metering elements having a region of supporting webs and being pressable against the ink-duct roller through the intermediary of the elastic foil, a foil-holding device for holding the elastic foil so that it is displaceable tangentially with respect to the ink-duct roller in a given feeding direction, and a motor-driven actuating device connected to the foil-holding device for continuously feeding the elastic foil in the given feeding direction, the elastic foil being formed with low-wear zones extending in the given feeding direction of the elastic foil and covering the region of supporting webs of the metering elements.

Abstract: An adjusting device for providing a zonewise adjustment of the ink gap with respect to the ink-fountain roller in a printing press is manually adjustable via a respective adjusting screw, and has an additional device for performing a coarse adjustment in a relatively short period of time. A plurality of such devices can be disposed side by side along the ink-fountain roller for providing numerous ink zones along the ink-fountain roller to thereby substantially reduce adjustment time for setting up an ink profile.

Abstract: A doctor blade bar for a short inking unit employs an eccentric disk to engage an abutment on a doctor blade holder to retract a doctor blade that is held by the holder and a cooperating doctor blade guide into a retracted position with respect to a screen roller, Disengagement of the eccentric disk from the abutment allows the doctor blade to be moved by a pressure spring into contact with the screen roller.

Abstract: An apparatus for placement of a doctor blade bar against an ink-dispensing roller utilizes spaced lifting or camming strips on doctor blade base support beams and cooperating counter strips or cam followers on doctor blade supporting base bodies to move the doctor blades toward or away from the screen roller. The slopes of the two inclined lifting strips on each support beam are preferably different from each other.

Abstract: A shiftable ink knife holder supports a plurality of spaced ink knives in an elongated support. The support is rotatable about an axis of rotation between working and rest positions. The rotation of the support can be accomplished by suitable drive motors. These drive motors also engage and disengage locking bolts that, in their locked position, engage the support.

Abstract: A method and system are provided for establishing a reference position of ink-metering elements relative to a duct roller of a printing machine. The reference position is established by moving the ink-metering element toward the duct roller while acoustically sensing for contact. When a noise level indicative of the ink-metering element being in contact with the roller is detected, the reference, or zero position is established. At that precise moment, a representative value which varies with the distance between the element and the roller is stored as the zero position.

Abstract: An ink feed adjusting apparatus for use in an ink supply equipment that includes a plurality of ink feed adjusting members juxtaposed with one another under a top plate so as to adjust the amount ink supplied by moving each of them towards or away from or bringing each of them into contact with the peripheral surface of an ink fountain roller the adjusting members have through-holes formed in each of them and cover members fitted at least in the respective upper parts of these through-holes.

Abstract: An offset blanket print/coat assembly for printing or coating rotating containers has a novel inker blade adjustment means which adjusts the fountain blade relative to the fountain roll both inwardly and outwardly, and holds the blade edge in various desired positions along is entire length by the adjustment of individual adjustment threaded shafts positioned along the blade length. Each shaft has spaced apart threaded sections, one of which is more coarsely threaded than the other. One threaded section threadably engages a threaded mounting block mounted to the ink reservoir, while the other threaded section threadably engages a threaded adjusting eye slidably received in a sliding block mounted to the ink reservoir. The adjusting eye is coupled to the blade by a pivotable linkage.

Abstract: A method for color adjustment and control in a printing press wherein the density spectra of individual process colors as well as the density spectrum of the color of paper are stored with given fractional percentages. The density spectra of at least one measuring point per ink zone on a printing copy and at respective points on a printed product are then measured. The density spectra measured on the printing copy and the printed product are then expressed as a linear combination of the density spectra of the individual process colors and the density spectrum of the color of the paper multiplied by fractions, the fractions being calculated so that the density spectra of the printing copy and the printed product are approximated through the linear combination. In the case of a deviation of the fractions between the printed product and the printing copy, the positions of the ink keys are adjusted so that a match of the density spectra is achieved.

Abstract: An ink supply source driving apparatus for rotary presses, capable of reducing the dimensions and weight of a rotary press and carrying out by a single ink supply source driving system an ante-printing rapid ink feeding operation, and an ink pump purging operation for the purpose of carrying out the cleaning of the parts after the completion of a printing operation and the cleaning of the parts for the purpose of replacing the ink by ink of a different color, the apparatus consisting of a synchronizing signal generator adapted to generate when a rotary press driving system in a rotary press is rotated a signal synchronous with the rotation thereof, an ink pump driving motor, a control unit adapted to control the ink pump driving motor selectively so that the ink pump driving motor is driven by an output from the signal generator synchronously with and at a predetermined rotational ratio with respect to the rotation of the rotary press driving system or independently of the rotation of the rotary press driving

Abstract: The values ascertained from printer's copies (8, 9), for ink zone presetting, are supplied to a color supply detection computer (3) via a film/plate scanner (4). Before the various scanning areas in accordance with scanning patterns (7) are summed up, the zonal preset values ascertained by the ink supply detection computer (3) undergo a correction in accordance with the value furnished by a weighting computer (16) for each scanning area. This optimizes the presetting of the ink zones. As a function of the corrected values taking the subject to be printed into account, ductor rollers (22) and rubber rollers (21) can be controlled in order to improve the ink penetration as a function of the subject in the circumferential direction as well.

Abstract: Printing apparatus has at least one print station including a blanket cylinder in rolling contact with an impression cylinder, a print cylinder for supporting a lithographic plate, the plate cylinder being in rolling contact with the blanket cylinder, at least one discharge source for applying an image to a plate supported by the plate cylinder, and a motor for moving the energy source relative to the plate cylinder so that when the plate cylinder is rotated, the discharge source scans a raster on the surface of the plate supported by the plate cylinder. The apparatus may be configured as an in-line or central-impression type press. A controller responsive to picture signals representing an original document repeatedly actuates each discharge source momentarily during the scan thereof so that the discharge source forms on the plate surface an image comprised of dots corresponding to the original document.

Abstract: Disclosed is an ink supplying apparatus which can drive and rotate a fountain roller at an arbitrary speed independently of the peripheral speed of a roller adjacent to the fountain roller when an ink fountain is fitted to a rotary press, which does not require large-scale maintenance and inspection, which is free from any danger, and which is equipped with an ink fountain having a fountain roller capable of being fitted to and removed from a suitable position corresponding to a maximum printing width.