EP0924072B1 - Method for operating a rotary printing machine and device in a rotary printing machine - Google Patents

Description

The invention relates to a method for operating a rotary printing press, according to the preamble of claim 1 and an apparatus for performing 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.

In EP 0 545 237 B1, to which reference is made in the preamble of claim 1 an inking unit is described in which a resumption of the Traversing movement of the friction rollers at the same time as the Ink application rollers to the printing form. This can be done through a Circuitry connection of the "pressure on" command with the Switching clutch of the friction roller actuating trigger device or via a Linking the trigger device with which the inking rollers on and shutdown pneumatic cylinder can be realized. With such an operable Inking unit can indeed be the color profile transverse to the printing direction during the stop received much longer than with further trituration, but not a cheap one Colorize 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.

In DE 25 07 179 C2, to which reference is made in the preamble of claim 11 is described, a drive device for oscillating friction rollers, which the shortcomings of the prior art described last 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 solved a device with the features of claim 11.

The inventive method for operating an inking unit with at least an inking roller which oscillates axially with a variable stroke amplitude comprehensive rotary printing press, in which the rotary printing press is operated first in an operating mode "pressure interruption", the Ink roller with minimal stroke oscillates, and then in an operating mode "Printing operation" is operated, the inking roller oscillating with normal stroke, is characterized in that the stroke amplitude of the inking roller before the start of Printing operation is enlarged.

The invention is based on the observation that when operating a Printing machine in the manner corresponding to the state of the art for a restoration of the printing status necessary and after Resumption of adjustment and compensation operations cause a relatively high amount of waste in the inking unit. According to the invention recognized that waste can be minimized if the compensation processes during the pressure interruption and especially before putting on the Ink application roller or rollers take place on the printing form for the inking. By reinserting the lateral rubbing before the one stop The following renewed start of printing is made use of the thixotropy of Printing ink an optimal liquefaction of the printing form for the coloring of the printing form Ink reached. Printing begins when the substrate is printed again Printing unit transported and printed in this, for. B. with that in a electronic control device entered command "pressure on". With this command can be a gradual start of an offset rotary printing press Blanket cylinder first a printing form cylinder and then to the Counter-pressure cylinders and in Dilitho rotary printing machines line up a printing form cylinder and an impression cylinder triggered become. With the "Print from" command, the blanket cylinder can be moved from the Printing form cylinder and of impression cylinder or can printing form cylinder and Counter pressure cylinders are parked apart.

The stroke amplitude of the friction roller can be from one in the first operating mode stopped axial stroke or a very small stroke, e.g. B. 1 mm, starting be enlarged. The stroke amplitude can be on the normal stroke, which is a ensures favorable lateral rubbing during printing, or on a different relative to the normal stroke amplitude, d. H. bigger or smaller, Stroke amplitude can be increased. After increasing the stroke amplitude in first operating mode can be maintained while maintaining this stroke amplitude there is a transition to the second operating mode. After an interim But enlargement can also reduce the stroke amplitude, e.g. B. on the minimum stroke, take place, with the command "pressure on" the stroke amplitude at Resumption of printing operations is increased again.

Preferably, the command "pressure on" can also be a line, one, several or preferably all inking rollers on the printing form to color it trigger. In this variant, the inking roller is or are Ink application rollers during the first mode of operation from the printing form turned off and turned on the printing form during the second operating mode. At the same time as the start of coloring, a previously interrupted one can also be used Printing ink supply from a color reservoir into the inking unit is reactivated become.

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 inventive device for performing the method and Changing the stroke amplitude of at least one axially oscillating inking roller in an inking unit of a rotary printing press, the friction roller through a friction stroke drive can be driven via a friction stroke transmission, which is a Backdrop with a groove and a sliding block movable in the groove includes and the backdrop of a first transmission link and the sliding block of one second transmission link of the friction lifting gear is carried and both Gear elements that can be driven by the friction stroke drive are characterized by this from that the backdrop is adjustable from a first position to a second position is arranged relative to the first gear member to the stroke amplitude of the inking roller enlarge before printing begins.

With this device, the method according to the invention is particularly favorable feasible because the device changes the stroke amplitude very quickly the inking 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.

In Fig. 2, the inking unit 6 and the dampening unit 7 of the printing press 1 are from the Fig. 1 shown in more detail. The ink is in one of the ink fountain 11 and the ink fountain roller 12 existing ink reservoir stored. The ink fountain 11 is equipped with a metering device 13 for zonal printing ink metering, which are lined up next to each other parallel to the ink fountain roller axis zone-wide control elements. The reciprocating jack roller 14 transmits a profile with different crossways to the printing direction Color layer thicknesses in the individual zonal metering areas Printing ink from the ink fountain roller 13 onto the first inking roller 15. In addition this includes the inking unit 6 a second, third and fourth driven Rubbing roller 16, 17, 18, a first seen in the direction of rotation of the printing form cylinder 3 Ink application roller 19 and further ink application rollers 20, 21, 22 for application the printing ink on the printing form 23. The dampening unit 7 comprises a basin-shaped Dampening solution reservoir 24, in which the dipping roller 25 is partially immersed. On the latter, the metering roller 26 is employed under contact. The dip roller 25 and the Metering roller 26 can be driven at a variable speed, so that on this Way the dampening solution flow rate, z. B. the amount of dampening solution per Machine revolution, is changeable so that the inking unit 6 during the Pre-humidification an increased amount of dampening solution compared to printing can be supplied within a short time. In addition, the speed of the Rolls 25, 26 with the printing machine speed depending on this be carried along, thus a constant minimum humidification with each Machine speed is guaranteed. The one with printing plate cylinder speed rotating dampening roller 27 and the slower rotating metering roller 26 are in contact with each other to form a gap with slip. To the Moist application roller 27, a dampening roller 28 is employed. The intermediate roller 29 is optionally on the inking roller 19 and / or the dampening roller 27 employable. The inking unit 6 and the dampening unit 7 can be integrated in the mode Moisture "operated, the inking roller 19 and the Dampening roller 27 placed on the printing form 23 and by the Intermediate roller 29 are connected. In this mode, the inking roller 19 carries a color dampening solution emulsion. In the "separate dampening" mode it is Intermediate roller 29 separated from at least one of the application rollers 19, 27. When by at least one roller, e.g. B. the intermediate roller 29 together connected inking unit 6 and dampening unit 7 can pre-wet the Inking unit 6 take place, the inking rollers 19 - 22 from the printing form 23 are turned off. The dampening roller 27 can be switched off from the printing form or, in particular when the printing starts soon, be employed on the printing form. However, the dampening solution can be pre-moistened with the inking unit different inking roller combinations are supplied. Furthermore, a pre-wetting of the inking unit 6 without this with the dampening unit 7 connecting roller take place 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. 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. 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. 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. To 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. mm are generated. 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. 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.

8 is a program flow chart with the electronic control device 8 to control the operation of the rotary printing press 1 after Program stages 73 to 81 to be processed according to the method of the invention shown. After the signal "Print off" triggered by the printer at the push of a button in program stage 73, the blanket cylinder is switched off in parallel Printing form and impression cylinder 73.1, the lifting stroke stops Interruption of the ink supply 73.2, switching off the inking rollers from the Printing form cylinder 73.3, changing the inking roller from the normal stroke to Minimum stroke 73.4 and deactivation of the substrate transport 73.5. In the event of, that the stroke amplitude by the control device 8 according to the program Minimum stroke is set greater than zero, if necessary, for. B. one yourself emerging comparatively long pressure interruption, a manual stopping of the friction roller (stroke amplitude zero) by the printer be made. This can be done by sending a command to the Control device 8 or by a mechanical changeover of the device respectively. In the subsequent program stage 74, rewetting takes place Printing form and in the following program level 75 is the Dampening roller turned off from the printing form cylinder. After that from the printer Signal "pressure on" triggered by pressing a button occurs in program stage 76 several parallel processes: These are a line of the dampening roller on the Printing form cylinder 76.1, an increase in the speed of the metering and immersion roller 76.2, the connection of the inking unit to the dampening unit is established by the Intermediate roller 76.3 and setting the inking roller from minimum stroke Normal stroke. In the subsequent program stage 77, the pre-wetting is carried out Printing form 77.1 and the inking unit 77.2, z. B. within three to five Machine revolutions. The following program stage 78 takes place in parallel activation of the siphon roller for supplying ink to the inking unit 78.1, a setting of the inking rollers on the printing form cylinder 78.2, which can be done simultaneously or staggered one after the other, adjusting the speed of the Dosing and immersion roller on normal operation 78.3 and starting the Blanket cylinder to the printing form cylinder 78.4. This is followed by pre-coloring the printing form according to program level 79, e.g. B. within several Machine revolutions. In program level 80 the blanket cylinder is switched on the impression cylinder switched on 80.1 and the printing material transport again activates 80.2, so that a production status according to program level 81 is 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

Driver

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

area

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)

1. Method for operating a rotary printing press (1) including an inking unit (6) having at least one ink distributor roller (15, 16, 17, 18) that oscillates axially with a variable stroke amplitude, which comprises operating the rotary printing press (1) first in a "printing interruption" operating mode, the ink distributor roller (15) oscillating with minimal stroke, and subsequently operating the printing press in a "printing operation" operating mode, the ink distributor roller (15) oscillating with normal stroke,
   characterized in that
   the stroke amplitude of the ink distributor roller (15) is increased before beginning the printing operation.
2. Method as set forth in claim 1,
   characterized in that
   the stroke amplitude is increased from the minimal stroke to the normal stroke.
3. Method as set forth in claim 1 or 2,
   characterized in that
   the inking unit (6) has at least one ink applicator roller (19, 20, 21, 22) engageable with and disengageable from a printing form (23) and that the stroke amplitude is increased when the ink applicator roller (19, 20, 21, 22) is disengaged from the printing form (23).
4. Method as set forth in claim 3,
   characterized in that
   the stroke amplitude is increased when all ink applicator rollers (19, 20, 21, 22) are in disengaged positions from the printing form (23).
5. Method-as set forth in one of the claims 1 to 4,
   characterized in that
   the rotary printing press (1) is a planographic press, in particular an offset printing press,
   that before beginning the printing operation, the printing unit (6) is predampened with the ink distributor roller (15) oscillating with an increased stroke amplitude, in particular with normal stroke, compared to minimal stroke.
6. Method as set forth in claim 5,
   characterized in that
   the feeding of dampening solution into the inking unit for its predampening is activated simultaneously with or after increasing the stroke amplitude.
7. Method as set forth in claim 5 or 6,
   characterized in that
   the planographic press has 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).
8. Method as set forth in claim 7,
   characterized in that
   the dampening unit (7) includes at least one dampening solution applicator roller (27) engageable with and disengageable from the printing form (23), and that the inking unit (6) is predampened when the dampening solution applicator roller (27) is disengaged from the printing form (23).
9. Method as set forth in one of the claims 1 to 8,
   characterized in that
   the magnitude of the minimal stroke is zero (standstill).
10. Method as set forth in one of the claims 1 to 9;
    characterized in that
    the stroke amplitude of the ink distributor roller (15) is adjusted by a device for adjusting the stroke amplitude, which is in particular actuated by an electronic control unit (8), in particular with an adjustable driver consisting of a guide piece (37) and a sliding block (32).
11. Device for performing the method as set forth in claim 1 and for varying the stroke amplitude of at least one axially oscillating ink distributor roller (15, 16, 17, 18) in an inking unit (6) of a rotary printing press, the ink distributor roller (15, 16, 17, 18) being drivable by a distributor stroke drive (35) via a distributor stroke gearing (43) which includes a guide piece (37) having a groove (40) and a sliding block (32) movable in the groove (40), and the guide piece (37) being carried by a first gearing member (36, 52) and the sliding block (32) being carried by a second gearing member (33, 47) of the distributor stroke gearing (43) and both gearing members (33, 36, 47, 52) being drivable by the distributor stroke drive (35),
    characterized in that
    the guide piece (37) is adjustably arranged from a first position into a second position relative to the first gearing member (52) in order to increase the stroke amplitude of the ink distributor roller (15, 16, 17, 18) before beginning the printing operation.
12. Device as set forth in claim 11,
    characterized in that
    an oscillating driving motion is transferable from the first gearing member (36, 52) to the second gearing member (33, 47) or from the second gearing member (33, 47) to the first gearing member (36, 52), the guide piece (37) and the sliding block (32) cooperating with one another as a driver.
13. Device as set forth in one of the claims 11 to 12,
    characterized in that
    the first position of the guide piece (37) is substantially perpendicular to the second position.
14. Device as set forth in one of the claims 11 to 13,
    characterized in that the guide piece (37) is adjustable by a servo drive (39).
15. Device as set forth in claim 14,
    characterized in that
    said servo-drive (39) is carried by at least one of the gearing
    members (33, 36, 47, 52) and in particular by the second gearing member (36, 52).
16. Device as set forth in one of the claims 11 to 15,
    characterized in that
    said first gearing member is embodied as a lever (52) pivotable about a lever axis (56).
17. Device as set forth in one of claims 11 to 16,
    characterized in that
    the guide piece (37) is rotatable about a guide piece axis (64), and the groove (40) has an arch shape.
18. Device as set forth in claim 17,
    characterized in that
    the mean radius (65) of the groove (40) has a length equivalent to the spacing between said lever axis (56) and said guide piece axis (64).
19. Device as set forth in one of the claims 15 to 18,
    characterized in that
    said lever (52) is formed as a multi-armed lever having a lever arm (51) supporting the guide piece (37).
20. Device as set forth in claim 19,
    characterized in that
    said lever (52) is constructed as a lever for moving at least two distributor rollers (15, 16) opposite to one another.
21. Device as set forth in one of the claims 14 to 20,
    characterized in that
    said guide piece (37) is adjustable by the servo-drive (39) which is controlled by an electronic control unit (8) according to the method as set forth in claim 1.
22. Rotary printing press - in particular rotary offset printing press - having at least one device as set forth in one of the claims 11 to 21.

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