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 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 liquid transfer device for rotary presses includes at least two cylinders which can transfer the liquid, especially ink, and at least one liquid transfer element intended to interact with the two cylinders in order to transfer the ink from one cylinder to the other cylinder. Each liquid transfer element can be displaced in an essentially circular path and come into essentially tangential contact with the cylinders.

Abstract: An undershot inking unit for a printing machine and a method for regulating ink distribution in a printing machine are disclosed. The undershot inking unit comprises an ink fountain roller communicating with an ink fountain, an inking roller, and an intermittent ductor roller for transferring ink from the ink fountain roller to the inking roller. In accordance with the present invention, the ductor roller is thrown onto the ink fountain roller at a rate that is independent of the printing speed of the printing machine, preferably, at a rate that is constant for all printing speeds. The disclosed apparatus and method alleviate the problem of ink fall-off in printing machines.

Abstract: An undershot inking unit for a printing machine and a method for regulating ink distribution in a printing machine are disclosed. The undershot inking unit comprises an ink fountain roller communicating with an ink fountain, an inking roller, and an intermittent ductor roller for transferring ink from the ink fountain roller to the inking roller. In accordance with the present invention, the ductor roller is thrown onto the ink fountain roller at a rate that is independent of the printing speed of the printing machine, preferably, at a rate that is constant for all printing speeds. The disclosed apparatus and method alleviate the problem of ink fall-off in printing machines.

Abstract: An undershot inking unit and associated method are disclosed. The undershot inking unit includes an ink fountain roller that is controlled independently of the printing speed of the printing machine, and in which the rotational contact angle of the distributor roller on the ink fountain roller is varied according to the printing unit speed. The method comprises controlling the rotational speed of the ink fountain roller independently of the printing speed of the printing machine; and varying the rotational contact angle of the intermittent ductor roller on the ink fountain roller according to the printing speed of the printing machine. In a preferred embodiment, the apparatus includes two coaxial cams rotatably adjustable with respect to each other. Each cam includes a predominant circumferential contour and a subordinate circumferential contour.

Abstract: A method and a device for controlling the sheet inlet when starting up a sheet-processing printing machine having a vibrator-type inking unit, in which the sheets are positioned at front lays, their correct position is established and, in the case of the position having been established as correct, the sheet inlet is cleared at a particular machine position. The intention is to avoid the first entering sheet running into the printing machine in each case at different phases of the vibrator cycle in the case of a plurality of start-up operations. This is achieved according to the invention in that the first sheet is conveyed up to the positioning line, the feeder is then switched off and the sheet inlet is only cleared again when the vibrator gearing assumes a particular angular position.

Abstract: An undershot inking unit and associated method are disclosed. The undershot inking unit includes an ink fountain roller that is controlled independently of the printing speed of the printing machine, and in which the rotational contact angle of the distributor roller on the ink fountain roller is varied according to the printing unit speed. The method comprises controlling the rotational speed of the ink fountain roller independently of the printing speed of the printing machine; and varying the rotational contact angle of the intermittent ductor roller on the ink fountain roller according to the printing speed of the printing machine. In a preferred embodiment, the apparatus includes two coaxial cams rotatably adjustable with respect to each other. Each cam includes a predominant circumferential contour and a subordinate circumferential contour.

Abstract: An apparatus for supplying ink to a printing machine comprising an ink fountain roller and an ink distributing roller supported by a frame so as to be parallel to each other, and a plurality of vibrating rollers divided axially of the rollers and disposed therebetween as arranged at a spacing axially thereof, each of the vibrating rollers being individually positionable alternatively at one of two positions between the rollers so as to be changeable in the state of contact with thereof with the ink fountain roller and the ink distributing roller. A fixed shaft fixed to the frame extends through the interiors of the plurality of tubular vibrating rollers with a predetermined clearance therebetween in the radial direction. A permanent magnet is provided at an inner peripheral portion of each vibrating roller. A magnetic device including an electromagnet is provided on an outer peripheral portion of the fixed shaft inside the vibrating roller.

Abstract: The present invention relates to an inking device for a rotary offset printing machine.This device is characterized in that the inking table is driven in rotation in the same direction as the ink fountain roller and in that an even number, equal to at least two, of intermediate transfer rollers are mounted on at least one mobile support and may be displaced between an inactive position and an active position in which one of the intermediate transfer rollers is in contact with the ink fountain roller, the other intermediate roller is in contact with the taker roller itself permanently maintained tangential to the inking table and the two intermediate transfer rollers are tangential to each other.

Abstract: In a printing press, a ductor assembly for transferring ink from a slowly rotating fountain roll to a rapidly rotating ink receiving roll includes a carriage and first and second idler rolls supported in counterrotating engagement on the carriage. In one embodiment, the ductor assembly moves between a first position in which the first idler roll contacts and picks up ink from the fountain roll, and a second position in which the second idler roll contacts and transfers ink to the ink receiving roll. The ductor assembly is driven to rotate at a speed intermediate the speeds of the fountain roll and the ink receiving roll, in a direction the same as the direction of rotation of the second idler roll about its own axis, and opposite to the direction of rotation of the first idler roll about its axis.

Abstract: In a printing press, a ductor assembly for transferring ink from a slowly rotating fountain roll to a rapidly rotating ink receiving roll includes a carriage and first and second idler rolls supported in counterrotating engagement on the carriage. In one embodiment, the ductor assembly moves between a first position in which the first idler roll contacts and picks up ink from the fountain roll, and a second position in which the second idler roll contacts and transfers ink to the ink receiving roll. The ductor assembly is driven to rotate at a speed intermediate the speeds of the fountain roll and the ink receiving roll, in a direction the same as the direction of rotation of the second idler roll about its own axis, and opposite to the direction of rotation of the first idler roll about its axis.

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 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: In the inking unit of a rotary printing press stand, a specified zonal adjustment for each print job is made to the ink ducts, which corresponds to the ink consumption required for the printed product in question. To create an ink distribution in the inking unit appropriate to the print run during the conversion of the inking unit from a previous job to a subsequent and new print job, the invention provides an improved method for the removal of the current ink profile so that the new ink profile can be established for the subsequent print job in a short time, without the necessity of emptying, cleaning and washing the inking unit. To change the ink profile before the beginning of printing, two process steps are proposed. First, the ink profile in the inking unit from the previous job is removed while the machine is running, and thereafter the ink profile in the inking unit appropriate to the subsequent print job is established under precisely defined conditions.

Abstract: A movable lifter roller (6) used for transferring the ink from an inking roller (8) to a brayer roller (5) is subdivided into a number of sections (6'). Each lifter-roller section (6') is pivoted on a respective two-armed lever (22). All levers (22) are pivotably disposed on a common axle (28) in such a way that the lifter-roller sections (6') normally rest against the brayer roller (5) and, in the activated state for picking up ink, rest against the inking roller (8). After the return into the position previously assumed, the ink picked up is transferred to the brayer roller (5). For putting the lifter-roller sections (6') into the activated state, there is associated with each individual lifter-roller section a respective electromagnet (31) which a lug (30) of the lever (22) serves as an anchor. All electromagnets 31 are rigidly fastened to a stationary support (33).

Abstract: An inker and form roller unit for a printing press includes a continuously rotating fountain roller for carrying ink from a reservoir. A combi-roller is in constant contact with a distribution roller to deliver ink to rollers of the printing press. The combi-roller and distribution roller are supported by a swivel lever that can pivot about the rotational axis of the distribution roller. The swivel lever carries a cam roller for contact with a control body having two or more sections, one of which is for continuous film inking and the other section for intermittent inking. The combi-roller is positioned relative to the fountain roller by the control body so as to form either a continuous fluid transfer gap or an intermittent fluid transfer gap.