EP0924072A1 - Method for operating a rotary printing machine and device in a rotary printing machine - Google Patents

Abstract

A rotary press printing machine (1) has an ink system (6) which includes at least one axial oscillating ink transfer cylinder (15,16) with adjustable lift. The printing machine is first operated in an interrupt mode, at which the cylinder oscillates with a minimum lift, and subsequently in a print mode, at which the cylinder oscillates with a normal lift, whereby the lift amplitude is increased before beginning the print operation. An Independent claim is provided for an arrangement implementing the operating method.

Description

The invention relates to a method for operating a rotary printing press the preamble of claim 1 and a device - in particular for Implementation of the method - in a rotary printing press according to the Preamble of claim 11.

Operating methods are known which relate to the method according to the invention provide that the printing unit without Printing material transport and the inking unit continues without ink supply and removal. The lateral rubbing is reduced so that in this operating state zone-differentiating ink layer thickness profile is retained in the inking unit. In front The inking unit is pre-moistened before printing is resumed. The Pre-humidification is required to do this through the dampening solution evaporation the interruption of the ink / fountain solution balance in the inking unit and on immediately set the printing form to a value that is favorable for the production run, so that waste is avoided.

Druck an" Kommandos mit der die Schaltkupplung der Reiberwalze betätigenden Auslösereinrichtung bzw. über eine Verknüpfung der Auslösereinrichtung mit dem die Farbauftragswalzen an- und abstellenden Pneumatikzylinder realisiert sein. Mit einem derart betreibbaren Farbwerk läßt sich zwar das Farbprofil quer zur Druckrichtung während des Stoppers wesentlich länger als bei weiterer Verreibung erhalten, jedoch kein günstiges Einfärben der Druckform erreichen.EP 0 545 237 B1 describes an inking unit in which the traversing movement of the friction rollers is resumed at the same time as the inking rollers are placed on the printing form. This can be done by connecting the circuitry

Printing on "commands can be realized with the trigger device actuating the clutch of the friction roller or by linking the trigger device with the pneumatic cylinder turning the inking rollers on and off. With an inking unit that can be operated in this way, the color profile can be considerably longer than that across the printing direction during the stopper preserved with further rubbing, but did not achieve a favorable inking of the printing form.

EP 0 705 692 A1 describes a method and a device for changing over described an inking system, which the aforementioned shortcomings of Do not eliminate the state of the art.

The device according to the invention is known to change the Stroke size of the lateral trituration devices are used with which the Stroke of a rotating friction roller increased and decreased with the inking unit running can be.

DE 36 29 825 A1 describes a device for axially adjusting the friction rollers with which the axial movement of the friction rollers from 0 to a maximum and a regulation segment with a drive groove includes. The regulating segment can be rotated on an axis in a side wall stored. Such a device is compared to that in first-mentioned document of the prior art device described production-technically less complex and less prone to faults, since no phase is correct Snap engagement of coupling parts must be considered constructively, claimed however, a lot of space. There is also a sudden change between one Minimum stroke and a maximum stroke not possible because the twist and the Locking of the regulating segment with the help of the gears is still relatively long lasts.

DE 25 07 179 C2 describes a drive device for oscillating friction rollers described the shortcomings of the last described state of the Technology not eliminated.

The invention has for its object in the operation of a Rotary printing machine waste due to brief interruptions to minimize.

The object is achieved by a method having the features of claim 1 and by a device having the features of claim 11 solved.

The method according to the invention for operating a rotary printing press comprising an inking unit, the inking unit comprising at least one inking roller which oscillates axially with a variable stroke amplitude, is characterized in that the rotary printing machine is first in an operating mode Print interruption "is operated, the inking roller oscillating with a minimum stroke, and subsequently in an operating mode Printing operation "is operated, the inking roller oscillating with normal stroke, and that the stroke amplitude of the inking roller is increased before the start of printing.

The invention is based on the observation that when a printing press is operated in the state-of-the-art manner, the adjustment and compensation processes in the inking unit necessary for restoring the printing condition and after resuming printing operation require a relatively high amount of waste. According to the invention, it was recognized that waste can be minimized if the compensation processes take place during the printing interruption and in particular before the inking roller or rollers are placed on the printing form for the inking thereof. By reinserting the lateral rubbing before the start of printing again following a stopper, the thixotropy of the printing ink is used to achieve optimal liquefaction of the printing ink for inking the printing form. Printing starts when the substrate is transported through the printing unit and printed on it again, e.g. B. with the command entered into an electronic control device Print on ". With this command, a step-by-step positioning of a blanket cylinder in offset rotary printing presses can first be triggered by a printing form cylinder and subsequently to the impression cylinder and in Dilitho rotary printing presses, a positioning of a printing form cylinder and a printing cylinder against one another. With the command Printing from "the blanket cylinder can be switched off simultaneously from the printing plate cylinder and from the impression cylinder or from the printing plate cylinder and impression cylinder.

The stroke amplitude of the friction roller can in the first operating mode from a stopped axial stroke or a very small stroke, e.g. B. 1 mm, starting to be enlarged. The stroke amplitude can be increased to the normal stroke, which ensures favorable lateral rubbing during printing, or to a stroke amplitude that is different from the normal stroke amplitude, ie larger or smaller. After increasing the stroke amplitude in the first operating mode, a transition to the second operating mode can take place while maintaining this stroke amplitude. After an interim increase, a reduction in the stroke amplitude, e.g. B. to the minimum stroke, with the command Pressure at "the stroke amplitude is increased again when printing operation is resumed.

Preferably the command Druck an "also trigger one, several or preferably all inking rollers on the printing form to color them. In this variant, the inking roller or the inking rollers are switched off from the printing form during the first operating mode and adjusted against the printing form during the second operating mode At the same time as the inking begins, a previously interrupted ink supply from a ink reservoir into the inking unit can be reactivated.

In a particularly advantageous embodiment of the method according to the invention it can be provided that during the first operating mode a pre-moistening the inking takes place. The dampening solution can be used for pre-moistening the inking unit by a dampening solution supply device, e.g. B. on the printing press anyway Existing dampening system can be fed with rollers.

Studies have shown that with a comparatively short pre-wetting time with increased stroke amplitude, e.g. B. during three to five machine revolutions Degradation of the zonal color dosage can be substantially avoided. The Inking unit can be designed differently depending on the type of printing press, whereby the distance of the inking roller with variable stroke amplitude to this Depending on the machine type z. B. due to different numbers of intermediate inking rollers can be of different sizes. The can vary accordingly Period of time (reaction time) until the dampening solution supplied over the Ink roller train flows to the inking roller, or is conveyed. Depending on the inertia of the system, the pre-dampening dampening solution can be used before, after or are preferably supplied simultaneously with the increase in the stroke amplitude. It is essential in this advantageous embodiment of the invention that the inking unit Dampening solution is supplied while the inking roller with an opposite Minimal stroke increased stroke amplitude oscillates.

Preferably, one that can be operated with a variable fountain solution delivery rate Dampening can be used, with this in the pre-moistening opposite the normal operation of increased output works. This can be done with a Lifter dampening the lifter cycle and for a film dampening the Rotation speed of the rollers, e.g. B. a plunger and one Dosing roller, can be increased. The length of time for pre-wetting and side wetting Rubbing with increased stroke amplitude can be limited to a certain number Revolutions of the printing unit cylinders (machine revolutions) related and in Depending on other operating parameters of the printing press controlled as well be variably preselectable.

For planographic printing presses with an inking unit and a dampening unit can be pre-moistened by at least one of the inking units with the dampening unit at least temporarily connecting roller take place over which the dampening solution from Dampening unit in the inking unit, e.g. B. is promoted directly to an inking roller. The Pre-wetting of the inking unit can be carried out at the same time as pre-wetting the Printing form, e.g. B. with a dampening roller applied to the printing form and ink application rollers parked by the printing form. This variant is advantageous if the printing operation starts again immediately after the pre-moistening is recorded. Pre-moistening can also take place from the printing form parked inking rollers and also dampening roller respectively. This variant is when the start of printing is delayed for pre-moistening advantageous.

Studies have shown that pre-wetting in the usual way and Way, d. H. with unchanged retention of the minimum stroke, at the start of printing streak-like spots appeared in the grid areas. These spots lead to one additional increase in the amount of waste. The cause was found to be a conventional pre-moistening with minimal lateral rubbing increasingly supplied and partially forming a surface water film Too little dampening solution is smoothed before it is applied to the printing form and on it printing ink is applied. According to the invention, it was recognized that these pressure problems can be avoided if that is for pre-wetting dampening solution supplied to the inking unit during printing interruption compared to the minimum stroke increased stroke amplitude, e.g. B. with full side Rubbing (normal stroke) is rubbed together with the color. Thereby a larger proportion of the dampening solution emulsifies into the ink and the remaining one Surface water film on the ink rollers is also smoothed.

The printing unit, the inking unit and the dampening unit can be coordinated can be controlled to each other by an electronic control device. This can the on and off movements of the printing unit cylinder and the on and Parking movements of the inking rollers and the dampening roller on and control from the printing form cylinder.

In a particularly advantageous embodiment of the method according to the invention can be provided that the printing unit, the inking unit and the dampening unit Controlling electronic control device also the device according to the invention controls to change the stroke amplitude and in particular their actuator.

The device according to the invention - in particular for carrying out the inventive method - to change the stroke amplitude at least an axially oscillating friction roller in a job - especially in Inking unit - a rotary printing machine, the friction roller through a The friction stroke drive can be driven via a friction stroke transmission, which is one of one first position in a second position adjustable backdrop with a groove and one in the groove movable sliding block, is characterized in that the Backdrop of a first gear link and the backdrop block of a second Gear member of the friction lifting gear is worn that the backdrop is adjustable is arranged relative to the first gear member, and that both gear members by the friction stroke drive can be driven.

With this device, the method according to the invention is particularly favorable feasible because the device changes the stroke amplitude very quickly the friction roller at low, to be applied by the actuator for adjustment Actuators, enables. In contrast to those described in the prior art Devices in which the link guide in one case as an adjusting one Coupling gear and in the other case as a guide curve of a sliding crank gear is used, the backdrop guide acts according to the invention as an optional, in particular from a first to a second position and from the second to the first position, adjustable carrier. By combining the backdrop with the sliding block can an oscillating drive movement - depending after whether the backdrop or the link that carries the sliding block the driving or the driven gear link is - from the first gear link the second gear link or from the second gear link to the first gear link be transmitted. By arranging the backdrop on a first movable Gear link and the sliding block on a second movable gear link of the friction lifting gear and the adjustability of the setting compared to this load-bearing gear member can by a, especially with regard to Linkage, simplified construction of the friction lifting gear the installation space better exploited and the manufacturing costs can be reduced.

Below a groove, a groove with a bottom surface (bottom) as well as an elongated hole without floor space and under a sliding block both a sliding block be understood as a role as well. The sliding block can be circular (e.g. bolt) or polygonal (e.g. square) cross section.

In a particularly advantageous embodiment of the device according to the invention can be provided that the backdrop of an actuator from the first in the second position is adjustable, the actuator being electronic Control device, in particular controlled by the method according to the invention can be. As an actuator z. B. electromagnetic actuators as well pneumatic and hydraulic piston-cylinder units are used. The Use of a double-acting or actable in both directions Pneumatic cylinder is advantageous because the backdrop is very secure in the corresponding positions can be held. The invention The method and the device are in sheet-fed and web-fed rotary printing machines applicable.

Further features of the invention are contained in the subclaims.

The invention is described below with reference to the drawing based on several Embodiments described.

Fig. 1

eine schematische Darstellung einer Bogenoffsetrotationsdruckmaschine mit elektronischer Steuereinrichtung,

Fig. 2

eine detailliertere schematische Darstellung des Farbwerkes und des Feuchtwerks der Druckmaschine aus Fig. 1,

Fig. 3

eine schematisch dargestellte Vorrichtung zur Veränderung der Hubamplitude einer Reibwalze,

Fig. 4

eine schematische Darstellung einer bevorzugten Ausführungsform der erfindungsgemäßen Vorrichtung,

Fig. 5

eine detailliertere schematische Darstellung eines Hebels der Vorrichtung aus Fig. 4,

Fig. 6

eine schematische Darstellung einer vorteilhaften Ausbildung der Kulisse,

Fig. 7

eine schematische Darstellung der Lagerung des Hebels aus Fig. 5 und

Fig. 8

einen Programmablaufplan, nach welchem die elektronische Steuereinrichtung der Druckmaschine die erfindungsgemäße Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens ansteuert.

In the drawings:

Fig. 1

1 shows a schematic representation of a sheet-fed offset rotary printing machine with an electronic control device,

Fig. 2

2 shows a more detailed schematic illustration of the inking unit and the dampening unit of the printing press from FIG. 1,

Fig. 3

1 shows a schematically illustrated device for changing the stroke amplitude of a friction roller,

Fig. 4

2 shows a schematic representation of a preferred embodiment of the device according to the invention,

Fig. 5

4 shows a more detailed schematic illustration of a lever of the device from FIG. 4,

Fig. 6

a schematic representation of an advantageous embodiment of the backdrop,

Fig. 7

is a schematic representation of the storage of the lever of Fig. 5 and

Fig. 8

a program flow chart according to which the electronic control device of the printing press controls the device according to the invention for carrying out the method according to the invention.

Identical or functionally identical parts are generally the same in the figures Provide reference numerals.

1 shows a sheet-fed rotary printing press 1 with a plurality of printing units 2 shown. Each printing unit 2 comprises a planographic printing device which, like shown, from the printing form cylinder 3, the blanket cylinder 4 and the Impression cylinder 5 can exist. Each printing unit also contains 2 Inking unit 6 and a dampening unit 7, which are shown in simplified form in FIG. 1. The printing press 1 is supported by a central electronic control device 8 controlled by a microprocessor 9. The operator can control the processes check and influence the control panel 10. The control device 8 controls the Printing units 2 and in particular the on and off movements of the cylinders 3, 4, 5 to each other as well as the inking unit 6 and the dampening unit 7 of each printing unit 2.

2, the inking unit 6 and the dampening unit 7 of the printing press 1 from FIG. 1 are shown in more detail. The printing ink is stored in a color reservoir consisting of the ink fountain 11 and the ink fountain roller 12. The ink fountain 11 is equipped with a dosing device 13 for zonal printing ink dosing, which consists of zone-wide adjusting elements lined up closely next to one another parallel to the ink fountain roller axis. The reciprocating siphoning roller 14 transfers the printing ink, which has a profile with different ink layer thicknesses in the individual zonal metering areas transversely to the printing direction, from the ink fountain roller 13 to the first inking roller 15. In addition to this, the inking unit 6 also comprises a second, third and fourth driven friction roller 16 , 17, 18, a first inking roller 19, as seen in the direction of rotation of the printing form cylinder 3, and further inking rollers 20, 21, 22 for applying the printing ink to the printing plate 23. The dampening unit 7 comprises a basin-shaped fountain solution reservoir 24, into which the immersion roller 25 is partially immersed. At the latter, the metering roller 26 is employed under contact. The dipping roller 25 and the metering roller 26 can be driven at a variable speed, so that in this way the dampening solution flow rate, for. B. the dampening solution flow rate per machine revolution is changeable, so that the inking unit 6 can be supplied with a dampening solution quantity increased compared to the printing operation within a short time during the pre-moistening. In addition, the speed of the rollers 25, 26 can be carried along with the printing press speed as a function of this, thus ensuring a constant minimum dampening at every press speed. The dampening roller 27 rotating at the printing form cylinder speed and the slower rotating metering roller 26 are brought into contact with one another to form a gap with slip. A dampening roller 28 is placed on the dampening roller 27. The intermediate roller 29 can optionally be adjusted to the inking roller 19 and / or the dampening roller 27. The inking unit 6 and the dampening unit 7 can be in mode integrated dampening ", with the inking roller 19 and the dampening roller 27 attached to the printing form 23 and connected by the intermediate roller 29. In this mode, the inking roller 19 applies an ink / fountain solution emulsion. In mode separate dampening ", the intermediate roller 29 is separated from at least one of the application rollers 19, 27. When the inking unit 6 and dampening unit 7 are connected to one another by at least one roller, for example the intermediate roller 29, the inking unit 6 can be pre-moistened, the inking rollers being used 19 - 22 are switched off from the printing form 23. The dampening roller 27 can be set off from the printing form or, in particular when the printing starts soon, can be placed against the printing form of the inking unit 6 without a roller connecting it to the dampening unit 7 via the printing form 23.

The automatic control 8 shown in FIG. 1 controls when starting up and after a machine stop the precise execution of all functions and stops the desired amount of dampening solution for each during printing Speed exactly one. The inking unit 6 and the printing form 23 are programmed pre-moistened. The control device 8 controls roller position, in particular the turning on and off of the inking rollers 15-18, and Dampening solution dosing in every phase. When printing is interrupted, everyone can Ink and dampening rollers 19 - 22, 27 can be switched off from the printing form 23. When restarting, the automatic control releases all the necessary functions automatically, that is the pre-moistening of the printing form 23 and the inking unit 6 About the intermediate roller 29 with the dampening roller 27 and the Production printing with speed-compensated dampening. After pre-wetting can then also automatically apply the inking rollers 15 - 18 to the Printing form 23 to be colored. In the shown in Figure 1 Multi-color printing press 1 runs the one controlled by the control device 8 Automatic of the individual printing units at exactly the right time one after the other so that each dampening unit starts under optimal conditions.

In Fig. 3 a device is shown with which the stroke amplitude of Rubbing rollers z. B. the dampening roller 28 shown in Figure 2 and / or one or can change several of the inking rollers 15-18 simultaneously. The shown Example refers to the first in the ink roller relative to the ink flow Ink roller 15, the frame 29, z. B. in the side walls of the printing press, is rotatably mounted. The journal 30 carries the driver 31, which one Transfer of the lifting movement to the rotating inking roller 15 enables. Of the here cuboid sliding block 32 is on the sliding block joint 34 in the Rod 33 rotatably supported and connected to the driver 31 by the latter. Of the The friction stroke drive 35 generates an oscillating drive movement with the amplitude H. This drive movement is transmitted through the rod 36 to the backdrop 37, which is rotatably mounted in the rod 36 via the link joint 38. The Link joint 38 is introduced into the bottom of the groove 40. The backdrop 37 is through the actuator 39 from the first position (shown in full line) to the second position (shown in broken lines) and adjustable back. The adjustment of the backdrop 37 relative to the sliding block 32 takes place in the movement phase in which the Link stone joint 34 and the link joint 38 congruent or in alignment stand on top of each other by setting 37 and setting block 38 simultaneously and be rotated together by an angle of 90 °.

The size of the stroke amplitude of the inking roller 15 is in the first position adjusted backdrop 37 different to the stroke amplitude in the second position. Each after the dimensional training of scenery 37 and scenery stone 32 results in In the longitudinal direction and in the width direction of the groove 40, a freewheel of different sizes the difference A - C or B - D of the sliding block 32 in the groove 40 and to the backdrop 37. In the event that the game A - C or B - D is smaller than the size 2 H of double Amplitude of the drive movement, the sliding block 32 is carried along through the backdrop 37 in both directions. If the game A - C or B - D bigger or is the same size, no take-along. To change the stroke amplitude of the Inking roller 15 must assume the constant drive amplitude H Difference A - C not equal to the difference B - D.

In the example shown, the game A - C of z. B. 18 mm assumption slightly, e.g. B. by 2 mm, smaller than twice the amplitude 2 H of z. B. 20 mm the drive movement, so that the stroke amplitude E of the inking roller 15 in both Directions of movement per 1 mm (minimum stroke) is when the link 37 is the first Holds position. The smooth sliding of the sliding block 32 in Longitudinal play B - D perpendicular to the longitudinal direction is essential less than twice the amplitude 2 H and can with z. B. 0.05 mm practically zero be so that the stroke amplitudes E when the backdrop 37 is in the second position is larger (normal stroke) than when the gate 37 is in the first position and in Example is 20 mm. Of course, the sliding block 32 can also here in the embodiment shown in the following figures, cylindrical be trained. In this case, C and D correspond to the diameter of the Setting stone and to change the stroke amplitude, A must not be equal to B. The the groove 40 in the longitudinal direction delimiting inner surfaces can in this case be semicircular, so that a full surface meeting of The sliding block 32 and the inner surface of the sliding block take place and wear in the form of a knocked out groove 40 is avoided.

4 shows a preferred embodiment of the device according to the invention shown. The inking rollers 15 and 16 shown in Fig. 2 are here axially moved in opposite directions to each other. It can be provided that beyond that further friction rollers are actuated by the device, e.g. B. in Fig. 2nd shown inking rollers 17, 18 and the dampening roller 28. For the axial Drive and a change in the stroke amplitude of these additional friction rollers can one of the inking rollers 15; 16 with one or more of the other friction rollers be connected in terms of drive via a rocker of known type (DE 36 29 825). The friction rollers 15, 16 are coupled by the drive 41 via the gear 42 to the rotation of the cylinder 3 of the printing unit rotatively and via the Friction gear 43 driven axially. For the axial and rotary drive two separate drives can also be provided. The Friction lifting gear 43 includes the gears 44-46. The one that functions as a crank Gear 44 forms together with the rod 47 functioning as a crank rod Crank gear 44, 47. The gear 44 has an eccentric to the axis 48 on this arranged crank pin 49, which via the joint 50 with the Rod 47 is connected. The rod 47 is formed with the bolt here Sliding block 32 connected. As shown, this can be in the sliding block joint 34 the rod 47 is rotatably mounted or non-rotatably attached to the rod 47. The Joint 50 and the sliding block joint 34 are each about two axes movable joints trained. As joints are z. B. spherical shells - or Universal joints can be used. The formation of the joints 34, 50 is preferred as Spherical roller bearings or ball bearings, with each self-aligning bearing on one eye End of the rod 47 is added. The inner ring center axis of the self-aligning bearing of the joint 50 runs in the image plane and corresponds to the axis of the Crank pin 49 on which the inner ring sits. The inner ring central axis of the Self-aligning bearing of the joint 34 runs perpendicular to the image plane and corresponds to the Axis of the sliding block 32 on which the latter inner ring sits. The disc-shaped backdrop 37 has a circular arc-shaped slot formed groove 40. The link 37 is in the lever arm 51 of the lever 52 rotatably mounted. The lever 52 has two further lever arms, each of which the drivers 31 are connected to one of the friction rollers 15, 16. The well known Type (DE 36 29 825) trained driver 31 each include a driver roller 53, between two disks attached to the journal 30 or in one Circumferential groove 54 of the journal 30 is guided. The lever 52 is rotatable in the frame 29 mounted, the bracket 55 the lever 52 and the lever axis 56th forming joint carries. The actuator is arranged on the lever 52 and is supported on an outer lever arm of the three-armed lever 52 and that on the middle Lever arm arranged backdrop 37 from. The actuator 39 shown is as a preferably designed in two directions pneumatic cylinder. Of the Actuator 39 is dependent on the electronic control device 8 Operating parameters of the printing press controlled. Such a thing Operating parameters can e.g. B. a certain number of revolutions of the Printing form cylinder 3. The control device 8 controls both the drive 41 the printing press or the printing unit and the actuator 39. Furthermore the control device 8 can switch the inking roller 57 on and off control the dampening roller not shown in Figure 4. The controls Control device 8 that turns the application roller 57 on and off Applicator roller actuator 58. It can also be provided that the Drive 58 not only the applicator roller 57, but also the backdrop 37 instead of additional actuator 39 actuated. Furthermore, FIG. 4 is an example for everyone mentioned pneumatic cylinder shown that this from a compressed air source 59 a valve 60 can be supplied with compressed air. Hydraulic can also be used Systems are used. The valve 60 shown is a multi-way valve trained and is controlled by the control device 8, for. B. magnetic operated. Via the valve 60, the piston rod 61 of the double-acting Pneumatic cylinders can optionally be extended and retracted. The piston rod 61 is connected via a joint 62 to the backdrop 37, so that this through the Actuator 39 can be rotated around the link joint 34. The angle of twist can be limited by additional stops.

The function is as follows: the rod 47 carries an oscillating thrust and Pull movement from which on the sliding block 32 engaging in the groove 40 the backdrop 37 is transmitted. In the first position of the backdrop 37 shown (with Entrainment) this friction stroke drive movement with a lower idling of the sliding block 32 in the backdrop 37 than in a to the first position in substantially vertical second position not shown (without entrainment) on the Link 37 and the lever 52 transferred. As a result of the lesser or practical missing idle, the lever 52 is carried over a larger one Swivel angle away. The oscillating friction rollers 15, 16 lead z. B. pro two revolutions of the printing form cylinder 3 a full oscillation back and forth a stroke from or per revolution from the center position to a dead center position and back.

The lever 52 thus forms the first gear member and the rod 47 the second Transmission member of the friction-type transmission 43, the link 37 relative to the lever 52 is adjustable and in particular rotatable. Both the lever 52 and the Rod 47 are driven by the drive 41. The lever 52 thereby leads an oscillating pivoting movement about its lever axis 56 and shifts the rotating friction rollers 15, 16 simultaneously in opposite axial directions Directions. One of two dead center positions of the system is shown in the figure. After a rotation of the link 37 by an angle of 90 ° in the second Position of the sliding block 32 has a greater idle, so that the backdrop 37 and the lever 52 not at all or back over a smaller swivel angle be moved. Both of the latter cases correspond to the minimum stroke.

In Fig. 5 is the rotatable about the lever axis 56 and the first gear member forming lever 52 shown in more detail. The backdrop 37 is the lever arm 51st worn and is rotatable about the link axis 64 in the lever arm 51 in the Bore 61 stored. The sliding block 32 has a circular cross section and the groove 40 is in the form of a circular arc and is in the form of an elongated hole. The Inner surfaces 62, 63 are concentric to the second position Lever axis 56. The mean radius 65 of the groove 40 corresponds to the distance between lever axis 56 and link axis 64. The arc length 66 of the middle The radius corresponds to the groove length A of the straight line shown in FIG. 3 extending groove 40. The groove 40 is arranged centrally to the link axis 64. Furthermore, the sliding block 32 is in the two dead center positions oscillating drive movement shown in dash-dotted lines. It can be seen that the Sliding block 32 in its movement over the groove length, for. B. in the case of here circular arc-shaped groove 40 shown by the pivot angle 68 each included arc length runs out. In this way, a minimum stroke of Rubbing rollers 15, 16 of z. B. 1 mm. With a longer groove 40 or A drive movement over a shorter distance can cause the swivel angle 68 be zero (striking without a middle name) or the sliding block 32 strikes not at all on the groove inner surfaces lying in its direction of movement. In these cases the minimum stroke of the stroke amplitude of the friction rollers is zero. In Fig. 5 is the first position of the backdrop 37 by the corresponding position of the Groove 40 (shown in dash-dotted lines) indicated. In this position there is a Taking the backdrop 37 through the sliding block 32 over a larger path, see above that an increased stroke amplitude of the friction roller compared to the minimum stroke is effected.

6 shows a preferred embodiment of the groove 40. The modification compared to the design shown in Fig. 5 consists in a along the Radius 65 belonging arc about the lever axis 56 displaced position of the Groove 40 so that the lying in the direction of movement of the sliding block 32 rounded inner surface 71 of the groove 40 extends coaxially to the link axis 64. On this can be a particularly quick and safe changeover of the Stroke amplitude can be realized, which is preferably in that shown in Fig. 4 The dead center position of the pushing movement of the rod 47 takes place, the actuator 39 can be activated before reaching this position. Can not continue shown stops can be provided, which the adjustment path or angle of Limit backdrop 37.

In Fig. 7 is a preferred embodiment of the bearing of the lever 52, the Setting stone 32 and the backdrop 37 shown in a side view. Of the Sliding block 32 is designed as a bolt, which in the rod 47 and in at least one further lever 69 is mounted. Storage and in particular the storage in two further levers 69 serves to stabilize the bearing Sliding block 32 and minimizes the wear of the groove 40 by a Tilting movement of the sliding block 32 in the groove 40 due to the driving force is prevented. In this way, the game between groove 40 and Make the sliding block 32 sufficiently large so that it runs particularly smoothly Adjustment of the backdrop 37 is possible. The storage of the sliding block 32 in the here the second gear member of the friction-lifting gear rod 47 can advantageously take place by means of a spherical roller bearing 70.

FIG. 8 shows a program flow chart with program stages 73 to 81 to be processed by the electronic control device 8 for controlling the operation of the rotary printing press 1 according to the inventive method. After the signal triggered by the printer at the push of a button Print from "in program stage 73, the blanket cylinder is switched off in parallel from the printing form and impression cylinder 73.1, the lifting stroke is stopped to interrupt the ink supply 73.2, the inking rollers are switched off from the printing form cylinder 73.3, the inking roller is switched from the normal stroke to the minimum stroke 73.4 and deactivated In the event that the stroke amplitude is set to a minimum stroke greater than zero by the control device 8 according to the program, a manual stopping of the friction roller (stroke amplitude equal to zero) can be required, for example if a comparatively long lasting pressure interruption is emerging. This can be done by a command at the push of a button to the control device 8 or by a mechanical change of the device, in the subsequent program stage 74 the printing form is rewetted and in the subsequent program stage 75 the Dampening roller turned off from the printing form cylinder. After the signal triggered by the printer at the push of a button Print on "several parallel processes take place in program stage 76: These are placing the dampening roller on the printing form cylinder 76.1, increasing the speed of the metering and immersion roller 76.2, establishing the connection of the inking unit to the dampening unit by means of the intermediate roller 76.3 and setting the In the subsequent program stage 77, the printing form 77.1 and the inking unit 77.2 are pre-moistened, for example within three to five machine revolutions. In the subsequent program stage 78, the lifting roller is activated in parallel to supply ink to the inking unit 78.1, a setting of the inking rollers on the printing form cylinder 78.2, which can take place simultaneously or in a staggered manner, a setting of the speed of the metering and immersion roller to normal operation 78.3 and a setting of the rubber blanket cylinder on the printing form cylinder 78.4 according to program level 79, e.g. B. within several machine revolutions. In program stage 80, the blanket cylinder is placed against the impression cylinder 80.1 and the printing material transport is reactivated 80.2, so that a printing status according to program stage 81 is now reached.

REFERENCE SIGN LIST

1

Sheet offset rotary printing machine

2nd

Printing unit

3rd

Printing form cylinder

4th

Blanket cylinder

5

Impression cylinder

6

Inking unit

7

Dampening system

8th

Control device

9

microprocessor

10th

control panel

11

Paint box

12th

Ink fountain roller

13

Dosing device

14

Lifter roller

15 to 18

Ink roller

19 to 22

Inking roller

23

Printing form

24th

Fountain solution reservoir

25th

Dipping roller

26

Dosing roller

27

Dampening roller

28

Dampening roller

29

frame

30th

Axle journal

31

Carrier

32

Sliding block

33

pole

34

Link stone joint

35

Grater stroke drive

36

pole

37

Backdrop

38

Link joint

39

Actuator

40

Groove

41

Drive motor

42

transmission

43

Friction lifting gear

44 to 46

gear

47

pole

48

axis

49

Crank pin

50

joint

51

Lever arm

52

lever

53

Carrier roll

54

Circumferential groove

55

console

56

Lever axis

57

Inking roller

58

Applicator roller actuator

59

Pressurized fluid source

60

Valve

61

Piston rod

62, 63

Interior surfaces

64

Link axis

65

radius

66

Arc length

67

Dead center

68

Swivel angle

69

lever

70

Self-aligning bearing

71

surface

72

drilling

A

Groove length

B

Groove width

C, D

Sliding block dimensions

E

Stroke amplitude of the friction roller

H

Drive stroke amplitudes

Claims (22)

Method for operating a rotary printing press (1) comprising an inking unit (6), the inking unit (6) comprising at least one inking roller (15; 16; 17; 18) which oscillates axially with a variable stroke amplitude,
characterized, that the rotary printing press (1) first in an operating mode

Print interruption "is operated, the inking roller (15) oscillating with a minimum stroke, and subsequently in an operating mode Printing operation "is operated, the inking roller (15) oscillating with normal stroke,
and that the stroke amplitude of the inking roller (15) is increased before the start of printing. Method according to claim 1,
characterized, that the stroke amplitude is increased from the minimum stroke to the normal stroke. The method of claim 1 or 2
characterized, that the inking unit (6) comprises at least one inking roller (19; 20; 21; 22) that can be adjusted and removed from a printing form (23), and that the stroke amplitudes increase when the inking roller (19; 20; 21; 22) takes place. Method according to claim 3,
characterized, that the enlargement of the stroke amplitudes takes place with all inking rollers (19, 20, 21, 22) in the positions of the printing form (23). Method according to one of claims 1 to 4,
characterized, that the rotary printing press (1) is designed as a planographic printing press - in particular an offset printing press - that before the start of printing operation, the inking unit (6) is pre-moistened and the inking roller (15) oscillates with stroke amplitudes that are larger than the minimum stroke, in particular with normal stroke. Method according to claim 5,
characterized, that the dampening solution supply to the inking unit for its pre-moistening is activated at the same time or after the stroke amplitudes have been enlarged. A method according to claim 5 or 6,
characterized, that the planographic printing machine comprises a dampening unit (7) from which the dampening solution is fed to the inking unit (6) via at least one roller (29) connecting the inking unit (6) to the dampening unit (7). Method according to claim 7,
characterized, that the dampening unit (7) comprises at least one dampening applicator roller (27) which can be set on and off the printing form (23) and that the inking unit (6) is pre-moistened when the dampening applicator roller (27) is turned off from the printing form (23). Method according to one of claims 1 to 8,
characterized, that the size of the minimum stroke is zero (standstill). Method according to one of claims 1 to 9,
characterized, that the stroke amplitude of the inking roller (15) is changed by a device - in particular controlled by an electronic control device (8) - for changing the stroke amplitude - in particular with an adjustable driver consisting of a link (37) and a link block (32). Device - in particular for carrying out the method according to claim 1 - for changing the stroke amplitude of at least one axially oscillating friction roller (15; 16; 17; 18; 28) in an application unit (6; 7) - in particular in the inking unit (6) - of a rotary printing press, The friction roller (15; 16; 17; 18; 28) can be driven by a friction stroke drive (35) via a friction stroke gear (43) which has a link (37) with a groove (40) which can be adjusted from a first position to a second position. and a sliding block (32) movable in the groove (40),
characterized, that the link (37) is carried by a first gear member (36; 52) and the sliding block (32) by a second gear member (33; 47) of the friction lifting gear (43), that the link (37) is adjustable relative to the first gear member ( 52) is arranged
and that both gear members (33, 36, 47, 52) can be driven by the friction stroke drive (35). Device according to claim 11,
characterized, that an oscillating drive movement can be transmitted from the first gear member (36, 52) to the second gear member (33, 47) or from the second gear member (33, 47) to the first gear member (36, 52), the link (37) and the Sliding block (32) interact as a driver. Device according to claim 11 or 12,
characterized, that the first position of the link (37) is substantially perpendicular to the second position. Device according to one of claims 11 to 13,
characterized, that the backdrop (37) is adjustable by an actuator (39). Device according to claim 14,
characterized, that the actuator (39) is carried by at least one of the gear members (33; 36; 47; 52) and in particular by the second gear member (36, 52). Device according to one of claims 11 to 15,
characterized, that the first gear member is designed as a lever (52) pivotable about a lever axis (56). Device according to one of claims 11 to 16,
characterized, that the link (37) can be rotated about a link axis (64) and the groove (40) is designed in the shape of a circular arc. Device according to claim 17,
characterized, that the mean radius (65) of the groove (40) corresponds to the distance between the lever axis (56) and the link axis (64). Device according to one of claims 15 to 18,
characterized, that the lever (52) is designed as a multi-arm lever which has a lever arm (51) in which the link (37) is mounted. Device according to claim 19,
characterized, that the lever (52) is designed as an at least two friction rollers (15, 16) in opposite directions to each other lever. Device according to one of claims 14 to 20,
characterized, that the link (37) can be adjusted by the actuator (39) controlled by an electronic control device (8) - in particular by the method according to claim 1. Rotary printing machine - in particular offset rotary printing machine - with at least one device according to one of claims 11 to 21.

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