EP0676284A1 - Flexographic printing machine particularly for multicolour printing - Google Patents

Flexographic printing machine particularly for multicolour printing Download PDF

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Publication number
EP0676284A1
EP0676284A1 EP95103735A EP95103735A EP0676284A1 EP 0676284 A1 EP0676284 A1 EP 0676284A1 EP 95103735 A EP95103735 A EP 95103735A EP 95103735 A EP95103735 A EP 95103735A EP 0676284 A1 EP0676284 A1 EP 0676284A1
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EP
European Patent Office
Prior art keywords
drive
pin wheels
drives
partial
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95103735A
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German (de)
French (fr)
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EP0676284B1 (en
Inventor
Udo Dipl.-Ing. Welschlau
Michael Dr.-Ing. Christoph
Wolfgang Dipl.-Ing. Becker
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Thimm Verpackung GmbH and Co KG
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Thimm Verpackung GmbH and Co KG
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Publication of EP0676284A1 publication Critical patent/EP0676284A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/007—Use of printing belts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/42—Means for tensioning webs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/43—Machines printing by both intaglio and another type of printing means

Definitions

  • the invention relates to a flexographic printing machine, in particular for multi-color printing, with at least one printing unit, which has a machine frame, deflection rollers mounted therein, a counter-pressure cylinder for guiding the web to be printed, which is accommodated in bearings which are preferably fixedly arranged in the machine room, a support cylinder, two pin wheels provided coaxially therewith and has at least one tensioning cylinder around which an endless belt carrying at least one cliché and provided with perforations for the pin wheels is guided, an ink transfer device assigned to the cliché of the endless belt, one acting on the endless belt via the pin wheels Drive and an additional drive acting on the endless belt with respect to the support cylinder, which can be freely rotated relative to the pin wheels, are provided to prevent the perforations of the endless belt from jumping over the pin wheels.
  • Such flexographic printing machines are used in particular in packaging technology, and the web to be printed can consist of paper, cardboard, aluminum foil, plastic film or the like.
  • Such a flexographic printing machine for multi-color printing has
  • a flexographic printing machine of the type described in the opening paragraph is known from EP-PS 18 147.
  • the web to be printed is guided over deflection rollers on the machine frame and over an impression cylinder for each printing unit.
  • the impression cylinder is slidably mounted in the machine frame for adjustment purposes, which has an unfavorable effect on the web tension conditions, but on the other hand provides the advantage that the unit comprising the support cylinder and pin wheels can be rotatably mounted in the machine frame.
  • this unit consisting of a support cylinder and two coaxially provided pin wheels is stationary, but the support cylinder and both mechanically connected pin wheels can be rotated independently of one another, over which an endless belt is guided, which is connected to at least one, but often with a large number of clichés is provided.
  • a first positive drive is provided for the endless belt, which acts on the endless belt via both pin wheels, in that the pin wheels are connected to one another in a rotationally fixed manner and the pins of the pin wheels engage in perforations in the endless belt for the purpose of registering.
  • This form-changing force which can also be called the resistance of the cliché, only occurs when printing on, but not when there is a distance between the cliché and the web to be printed, as is the case in the non-printing state.
  • This deformation force changes when the plate passes through the pressure gap in accordance with the design of the plate. In a certain operating state, this deformation force can be greater during printing or can be greater than the maximum driving force that can be transmitted to the endless belt by means of the drive via the pins of the pin wheels.
  • an additional drive is proposed in the known flexographic printing machine, that is to say a drive which, in addition to the torque which is positively transmitted to the endless belt via the pin wheels, transmits its torque to the endless belt via frictional engagement.
  • This additional drive acts on the support cylinder as a drive roller on the endless belt, with the support cylinder being freely rotatable relative to the two pin wheels.
  • the backward shaping work during printing only occurs when the endless belt rotates, if there is a cliché in the printing nip where the shaping work occurs, but it certainly corresponds to a frequently occurring case that the cliché is not continuous over the circumference of the endless belt is provided, times arise during printing in which the deformation force also disappears.
  • the shape change work also changes as the cliché passes through the printing nip.
  • the size of the deformation work also depends on the printing area of the printing block located in the printing gap.
  • a complicated control device is provided in the known flexographic printing press. This control device has sensor elements for the continuous detection of a variable which is at least proportional to the deformation force and which are switched on in the drive in the area of the pin wheels.
  • the Measurement data must be forwarded via slip rings.
  • the sensor elements are based on a force or torque measurement with the help of strain gauges.
  • the control device also includes a clutch and a brake, which are part of a control loop and via which the additional drive on the support cylinder is influenced in a regulating manner.
  • the additional drive is removed from the machine drive.
  • the drive via the pin wheels is also derived from the machine drive.
  • the unit is formed from pinwheels and support cylinders which can be rotated relative to one another, the drive via the pin wheels together and the additional drive via the support cylinder being introduced into the endless belt alone.
  • a flexographic printing press is known from EP-OS 308 367, in which the impression cylinder is already mounted in a stationary manner in the machine frame, so that the web tension conditions advantageously do not change during a setting process.
  • the support cylinder is movable relative to the machine frame for adjustment purposes.
  • the bearings of the support cylinder are arranged to be displaceable in at least two directions and the bearings of the clamping cylinder in at least one direction in the machine frame.
  • there is another Machine drive is provided, via which the impression cylinder is driven.
  • DE-OS 41 00 871 shows a flexographic printing machine with an impression cylinder which is also fixed in the machine frame. While avoiding a complicated control device, a drive via the pin wheels and an additional drive for the endless belt are coordinated. The additional drive is attached to the endless belt via the tensioning cylinder.
  • the support cylinder on the other hand, is designed to run freely, ie it has no drive.
  • An actuating device is provided for the control of the additional drive, via which an additional force acting on the endless belt can be controlled in such a way that, on the one hand, when printing, it is greater than the difference between the backward deformation force when the cliché passes through the gap between the web and Support cylinder and the maximum force transmitted from the pin wheels to the endless belt and, on the other hand, when not printing is smaller than the maximum force that can be transmitted from the pin wheels to the endless belt.
  • the cliché on the endless belt will not be designed or applied symmetrically to the vertical longitudinal center plane of the flexographic printing machine, which results in different levels of stress on the perforation on one side of the machine compared to the perforation on the other side of the machine.
  • the pin wheel on the one hand transmits a larger proportion of the drive torque than the pin wheel on the other side in order to overcome the respective proportions of the deformation work. Since the endless belt with the applied clichés represents a quasi-elastic body, an uneven load or an uneven drive due to relative rotation of the angular position has a disadvantageous effect on the register accuracy on the right and left.
  • the invention is therefore based on the object of providing a flexographic printing machine of the type described at the outset with at least one printing unit, but preferably with a plurality of printing units for multi-color printing, with which printing can be carried out in conjunction with other similar printing units with improved register accuracy, without the risk there is a limit to the skipping of a pin wheel compared to its perforations on the endless belt.
  • this is achieved in the flexographic printing machine of the type described in the introduction in that the two pin wheels are freely rotatable relative to one another, in that the drive for the two pin wheels is divided into two separately controllable partial drives, that a measuring device for the current angular positions of the two pin wheels relative to one another and the instantaneous drive torques of the two sub-drives are provided to each other, and that a control device is provided which is designed on the one hand to compensate for drive torques of the same size via the two sub-drives for the pin wheels and on the other hand - if a limit value of these aforementioned drive torques is exceeded - to initiate a requirement adjusted additional torque via the additional drive of the support cylinder on the endless belt.
  • the invention is based on the knowledge of working to ensure that essentially the same drive parts are transmitted to the two perforations of the endless belt via both pin wheels.
  • the adjustment is carried out in such a way that the larger drive torque is reduced and the smaller drive torque is increased by the two drive torques transmitted on the right and left again as quickly as possible to bring an equal value.
  • This equally large value can and will fluctuate in the course of the passage of a cliché through the pressure gap, that is, it can become larger and smaller in time.
  • the total drive torque to be transmitted via the pin wheels is divided into two partial drive moments so that each partial drive torque increases by only half the amount when the total drive torque of the pin wheels increases.
  • This has the advantage that the limit value at which the pin wheels skip at the perforations is only reached much later with increasing work on the shape change. The risk of the pin wheels skipping is thus considerably reduced.
  • a prerequisite for this mode of operation is, of course, that the two pin wheels are no longer mechanically coupled as before by a common drive, but that two separately controllable partial drives are each provided for only one of the two pin wheels.
  • the instantaneous angular positions of the two pin wheels relative to one another are continuously monitored via the measuring device.
  • a work of deformation occurring asymmetrically to the vertical longitudinal center plane manifests itself in a deviation of the instantaneous angular positions of the two pin wheels from one another.
  • different drive torques of the two partial drives would occur.
  • the control device ensures that this is counteracted until the two drive torques on the two partial drives for the pin wheels are again the same size. Since the endless belt with the applied cliché is to be regarded as a quasi-elastic body, this regulation is possible, and there are even loads in the area of the perforations on the pin wheels on the right and left.
  • the perforation reveal pressure on the right and left is the same, and so is that Wear will occur evenly, so that overall there is a significantly increased lifespan of the endless belt with the cliché.
  • the two partial drives for synchronizing the current angular positions of the two pin wheels can be connected to one another by an electrical shaft, as is also known in printing technology. This means that the two pin wheels are connected to each other at a rotational angle. A mechanical coupling between the two pin wheels is advantageously eliminated.
  • the two partial drives can each have an electric motor, to each of which a rotary encoder is connected as part of the measuring device for determining the instantaneous angular positions of the two pin wheels.
  • These electric motors are, in particular, digitally controlled individual motors, which can also be connected to one another per printing unit via electrical shafts in synchronism with the angle of rotation.
  • the new drive concept eliminates the entire complex and fault-prone state-of-the-art system. With the new measuring device, the instantaneous drive torques of the two pinwheels are measured directly via a device for measuring the instantaneous current consumption of each of the two electric motors. The current consumption is proportional to the drive torque and can be immediately measured and processed for control purposes.
  • the respective drive torque corresponds to the partial torque which is transmitted to the respective perforation of the endless belt via the pin wheel.
  • the control device is also digital. It regulates the electric motor for the right pinwheel and the electric motor for the left pinwheel in their relative angular position to each other until an equal moment distribution is achieved.
  • One of the two partial drives for the two pin wheels is provided as a guide drive for the control device, while the other partial drive is designed as a follow-up drive.
  • the two drives are always directed in opposite directions. It is in itself irrelevant which of the two partial drives is used as a guide drive and which as a follow-up drive.
  • the partial drive serving as the guide drive is arranged coaxially with the common axis of the pin wheels and the support cylinder, so that the shortest possible drive path can be used for the guide drive.
  • the additional drive for the support cylinder can be provided coaxially to the common axis of the pin wheels and the support cylinder and have an electric motor to which a rotary encoder is connected as a component of the measuring device, the partial drive serving as the follower drive being offset from the common axis of the pin wheels and the support cylinder is.
  • the position and the starting point of the additional drive and the subsequent drive which are arranged on the same side of the machine, could also be exchanged for one another in order to have a particularly rapid intervention possibility for the additional drive, which is intended to prevent the pin wheels from jumping over it makes sense to arrange the additional drive coaxially and to provide an additional transmission stage for bridging the parallel axes with regard to the subsequent drive.
  • the support cylinder and / or the clamping cylinder can essentially consist of a carbon fiber composite material in order to reduce the diameter and the moment of inertia. This reduces the moment of inertia by about 80%, which is the basis for faster control.
  • the reduction in the diameter also leads to a reduction in the minimum length of the endless belt and thus in many cases to a reduction in printing plate costs in the case of multiple printing in the direction of the printing unit.
  • a higher-level control device is provided, via which the rotary encoders of the partial drives of the printing units serving as guide drives, the rotary encoders of the partial drives of the printing units serving as follow-up drives, and the rotary encoders of the additional drives Printing units are interconnected.
  • Figure 1 shows schematically a machine frame 1 of a printing unit 2.
  • a support cylinder 3 is rotatably mounted in bearings which can be displaced for adjustment purposes.
  • the support cylinder 3 has a width corresponding to the working width of the printing unit 2 or the flexographic printing press.
  • a pin wheel 4 is provided to the left of the support cylinder 3 and a pin wheel 5 is provided to the right of the cylinder 3.
  • the pin wheels 4 and 5 are rotatable with respect to each other as well as with respect to the support cylinder 3.
  • the back-up cylinder 3 is assigned a counter-pressure cylinder 6, which is accommodated in bearings which are preferably arranged fixed in the machine frame 1.
  • the web 8 to be printed is guided around deflection rollers 7 and the impression cylinder 6 and runs through the printing unit according to arrow 9.
  • a clamping cylinder 10 is assigned to the support cylinder 3 and the pin wheels 4 and 5.
  • An endless belt 11 is looped around the support cylinder 3 and the pin wheels 4 and 5 on the one hand and around the tension cylinder 10 on the other hand, which is filled with clichés in single or multiple uses. Depending on the length of the endless belt 11, the tensioning cylinder 10 can be moved or adjusted to a corresponding distance from the support cylinder 3.
  • the tensioning cylinder 10 is shown as it is set with an endless belt 11 of minimal length. Since the impression cylinder 6 is preferably mounted fixed in the machine frame 1, the unit comprising the support cylinder 3, pin wheels 4, 5 and tensioning cylinder 10 is held by a carrying device 12 and can be displaced by the dimension e for adjustment purposes.
  • Each printing unit has an ink transfer device 13 with an anilox roller 14 and a doctor blade 15.
  • a second anilox roller 16 can be mounted on a swivel arm 17.
  • the z. B. right-hand pin wheel 5 ( Figure 1) is assigned a first partial drive 18 which is separately controllable or adjustable.
  • the partial drive 18 is used only for Drive of the pin wheel 5.
  • the partial drive 18 has an electric motor 19 and a rotary encoder 20 which monitors the angular position of the pin wheel 5.
  • the rotary encoder 20 is part of a measuring device 21 for determining the current angular position of the pin wheel 5.
  • a measuring device 22 is provided for the current drive torque of the pin wheel 5.
  • the partial drive 18 is provided here as a guide drive because it is provided coaxially with the common axis 23 of the support cylinder 3 and the pin wheels 4, 5.
  • a partial drive 24 is provided for the pin wheel 4.
  • the partial drive 24 in turn has an electric motor 25 and a rotary encoder 26.
  • a measuring device 27 for determining the current angular position of the pin wheel 4 and a measuring device 28 for the current drive torque of the pin wheel 5 are assigned to the partial drive 24.
  • the axis 29 of the partial drive 24 is provided offset to the axis 23.
  • a gear stage 30, which can have a belt 31, is provided in the manner shown in FIGS. 1 and 3.
  • An additional drive 32 is provided coaxially to the axis 23 and is assigned exclusively to the support cylinder 3.
  • the auxiliary drive 32 has an electric motor 33 and a rotary encoder 34.
  • the additional drive 32 also has a measuring device 35 for determining the instantaneous additional torque of the support cylinder 3.
  • Another measuring device 36 on the additional drive 32 serves to record the instantaneous drive torque which is transmitted to the endless belt 11 via the support cylinder 3.
  • FIG. 5 shows how the electric motors 25, 33 of the partial drive 24 and the additional drive 32 are connected to a control device 37 which is assigned to the individual printing unit.
  • An electrical line 38 leads from the measuring devices 21 and 22 of the partial drive 18 designed as a guide drive to the control device 37, from which the partial drive 24 and the auxiliary drive 32 are readjusted.
  • An electrical line 39 leads from a higher-level control device 40 for the entire flexographic printing machine to the electric motor 19 of the partial drive 18. It goes without saying that the partial drives 18 and 24 can also exchange their function. However, it makes sense to choose the more precise partial drive as the guide drive, namely the partial drive, which is not required via a gear stage to bridge an arrangement with offset axes.
  • a line 41 leads from the measuring devices 21 and 22 of the partial drive 18 to the higher-level control device 40.
  • the measuring devices 21, 22, 27, 28, 35, 36 are used to detect the respective angular positions or the respective torques.
  • the control device 37 of each printing unit controls these angular positions and torques relative to one another.
  • the higher-level control device 40 not only controls the relative angular positions and the torques with one another, but also the printing speed through the entire flexographic printing machine.
  • Only lines 39 'and 41' are indicated to illustrate a second printing unit. It goes without saying that the remaining components are also provided, as has been described with reference to the control device and arrangement for the first printing unit.
  • Other printing units, e.g. B. 2 ' are connected to the higher-level control device 40 according to the number of printing units, as indicated in Figure 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
  • Printers Characterized By Their Purpose (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

The printing machine has machine frame (1) deflector rollers (7), a counter pressure cylinder (6), a continuous belt (11), pin wheels (4,5), and a drive. The two pin-wheels are freely rotary mounted. The drive for the two pin wheels is divided into two separately controlled part drive mechanisms (18,24). A meter (21,27,22,28) measures the momentary angular positions of the two pin-wheels and the drive moments of the two part-drives. A regulator controls drive moments of equal amount by the two part-drive mechanisms for the pin wheels. The two part drives are connected by an electric shaft for synchronising the momentary angular positions of the two pin wheels. The two part drives each have an electric motor (19,25) to which is connected to shaft-encoder as constituent part of the meter. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Flexodruckmaschine, insbesondere für Mehrfarbendruck, mit mindestens einem Druckwerk, das einen Maschinenrahmen, darin gelagerte Umlenkrollen, einen in vorzugsweise ortsfest im Maschinenraum angeordneten Lagern aufgenommenen Gegendruckzylinder zur Führung der zu bedruckenden Bahn, einen Stützzylinder, zwei dazu koaxial vorgesehene Stifträder und mindestens einen Spannzylinder aufweist, um die ein mindestens ein Klischee tragendes und mit Perforationen für die Stifträder versehenes Endlosband geführt ist, wobei eine dem Klischee des Endlosbandes zugeordnete Farbübertragungseinrichtung, ein über die Stifträder auf das Endlosband einwirkender Antrieb und ein über den gegenüber den Stifträdern frei drehbaren Stützzylinder auf das Endlosband einwirkender Zusatzantrieb zum Verhindern des Überspringens der Perforationen des Endlosbandes gegenüber den Stifträdern vorgesehen sind. Solche Flexodruckmaschinen werden insbesondere in der Verpackungstechnik eingesetzt, wobei die zu bedruckende Bahn aus Papier, Karton, Aluminiumfolie, Kunststoffolie o. dgl. bestehen kann. Eine solche Flexodruckmaschine für Mehrfarbendruck weist mindestens jeweils ein Druckwerk je Farbe auf.The invention relates to a flexographic printing machine, in particular for multi-color printing, with at least one printing unit, which has a machine frame, deflection rollers mounted therein, a counter-pressure cylinder for guiding the web to be printed, which is accommodated in bearings which are preferably fixedly arranged in the machine room, a support cylinder, two pin wheels provided coaxially therewith and has at least one tensioning cylinder around which an endless belt carrying at least one cliché and provided with perforations for the pin wheels is guided, an ink transfer device assigned to the cliché of the endless belt, one acting on the endless belt via the pin wheels Drive and an additional drive acting on the endless belt with respect to the support cylinder, which can be freely rotated relative to the pin wheels, are provided to prevent the perforations of the endless belt from jumping over the pin wheels. Such flexographic printing machines are used in particular in packaging technology, and the web to be printed can consist of paper, cardboard, aluminum foil, plastic film or the like. Such a flexographic printing machine for multi-color printing has at least one printing unit per color.

Eine Flexodruckmaschine der eingangs beschriebenen Art ist aus der EP-PS 18 147 bekannt. Die zu bedruckende Bahn wird über Umlenkrollen am Maschinenrahmen und über einen Gegendruckzylinder je Druckwerk geführt. Der Gegendruckzylinder ist zu Anstellzwecken im Maschinenrahmen verschiebbar gelagert, was sich ungünstig auf die Bahnspannungsverhältnisse auswirkt, jedoch andererseits den Vorteil erbringt, daß die Einheit aus Stützzylinder und Stifträdern ortsfest drehbar im Maschinenrahmen gelagert werden kann. Dem Gegendruckzylinder gegenüber-liegend ist diese Einheit aus einem Stützzylinder und zwei koaxial vorgesehenen Stifträdern ortsfest, aber Stützzylinder und beide mechanisch miteinander verbundene Stifträder unabhängig voneinander drehbar vorgesehen, über die ein Endlosband geführt ist, welches mit mindestens einem, oft aber mit einer Vielzahl von Klischees versehen ist. Für das Endlosband ist ein erster formschlüssiger Antrieb vorgesehen, der über beide Stifträder auf das Endlosband einwirkt, indem die Stifträder drehfest miteinander verbunden sind und die Stifte der Stifträder in Perforationen im Endlosband zum Zwecke der Registerhaltung eingreifen. Beim Hindurchführen der auf dem Endlosband befindlichen Klischees durch den Spalt zwischen Stützzylinder und Gegendruckzylinder bzw. zu bedruckender Bahn entsteht eine Aufwölbung in dem nachgiebigen Material des Klischees und damit eine Formänderungsarbeit bzw. eine nach rückwärts gerichtete Formänderungskraft. Diese Formänderungskraft, die auch als Widerstandskraft des Klischees bezeichnet werden kann, tritt nur beim Drucken auf, nicht dagegen dann, wenn zwischen Klischee und zu bedruckender Bahn ein Abstand vorliegt, wie es im Zustand des Nicht-Druckens gegeben ist. Diese Formänderungskraft ändert sich beim Hindurchtreten des Klischees durch den Druckspalt entsprechend der Ausbildung des Klischees. Diese Formänderungskraft kann in einem bestimmten Betriebszustand während des Druckens größer sein oder werden als die vermittels des Antriebes über die Stifte der Stifträder auf das Endlosband maximal übertragbare Antriebskraft. In einem solchen Fall wird dies dazu führen, daß die Perforationen des Endlosbandes gegenüber den Stifträdern überspringen, wodurch selbstverständlich die Passergenauigkeit verlorengeht und das Druckergebnis unbrauchbar wird. Um dieses Problem zu lösen, wird bei der bekannten Flexodruckmaschine ein Zusatzantrieb, also ein Antrieb, der zusätzlich zu dem über die Stifträder formschlüssig auf das Endlosband übertragene Drehmoment sein Drehmoment über Reibschluß auf das Endlosband überträgt, vorgeschlagen. Dieser Zusatzantrieb wirkt auf den Stützzylinder als Antriebswalze auf das Endlosband ein, wobei der Stützzylinder gegenüber den beiden Stifträdern an sich frei drehbar gelagert ist. Da die nach rückwärts gerichtete Formänderungsarbeit während des Druckens beim Umlauf des Endlosbandes nur dann auftritt, wenn sich ein Klischee im Druckspalt befindet, an welchem die Formänderungsarbeit auftritt, es aber durchaus einem häufig vorkommenden Fall entspricht, daß das Klischee über den Umfang des Endlosbandes nicht durchgehend vorgesehen ist, entstehen beim Drucken Zeiten, in denen auch die Formänderungskraft verschwindet. Auch während des Durchtritts des Klischees durch den Druckspalt ändert sich die Formänderungsarbeit. Die Größe der Formänderungsarbeit ist auch von der jeweils im Druckspalt befindlichen Druckfläche des Klischees abhängig. Um dieser sich ändernden Formänderungskraft Rechnung zu tragen, ist bei der bekannten Flexodruckmaschine eine komplizierte Regeleinrichtung vorgesehen. Diese Regeleinrichtung besitzt Fühlerelemente zum kontinuierlichen Erfassen einer zumindest der Formänderungskraft proportionalen Größe, die in den Antrieb im Bereich der Stifträder eingeschaltet sind. Die Meßdaten müssen über Schleifringe weitergeleitet werden. Die Fühlerelemente basieren auf einer Kraft- bzw. Drehmomentmessung mit Hilfe von Dehnungsmeßstreifen. Zu der Regeleinrichtung gehört weiterhin eine Kupplung und eine Bremse, die Bestandteil einer Regelschleife sind und über die der Zusatzantrieb auf den Stützzylinder regelnd beeinflußt wird. Der Zusatzantrieb wird vom Maschinenantrieb abgenommen. Auch der Antrieb über die Stifträder wird vom Maschinenantrieb abgeleitet. Bei dieser bekannten Flexodruckmaschine wird die Einheit aus Stifträdern und Stützzylinder gebildet, die an sich gegeneinander verdrehbar sind, wobei der Antrieb über die Stifträder gemeinsam und der Zusatzantrieb über den Stützzylinder allein in das Endlosband eingeleitet werden. Es ist nachteilig, daß die Einbringung des Antriebes einerseits und des Zusatzantriebes andererseits bei der koaxialen Bauweise zwischen Stifträdern und Stützzylinder und infolge der dort gegebenen beengten Verhältnisse nicht einfach zu realisieren ist. Weiterhin liegen diese empfindlichen Teile und insbesondere die Fühlerelemente der Regeleinrichtung in einem Bereich der Flexodruckmaschine, in dem sie Waschwasser und anderen Reinigungsmitteln und auch der Farbe ausgesetzt sind. Zudem ist die mechanische Kopplung der Stifträder über den gemeinsamen Antrieb verschleißanfällig, was sich negativ auf die Registerhaltigkeit auswirken kann.A flexographic printing machine of the type described in the opening paragraph is known from EP-PS 18 147. The web to be printed is guided over deflection rollers on the machine frame and over an impression cylinder for each printing unit. The impression cylinder is slidably mounted in the machine frame for adjustment purposes, which has an unfavorable effect on the web tension conditions, but on the other hand provides the advantage that the unit comprising the support cylinder and pin wheels can be rotatably mounted in the machine frame. Opposite the impression cylinder, this unit consisting of a support cylinder and two coaxially provided pin wheels is stationary, but the support cylinder and both mechanically connected pin wheels can be rotated independently of one another, over which an endless belt is guided, which is connected to at least one, but often with a large number of clichés is provided. A first positive drive is provided for the endless belt, which acts on the endless belt via both pin wheels, in that the pin wheels are connected to one another in a rotationally fixed manner and the pins of the pin wheels engage in perforations in the endless belt for the purpose of registering. When the clichés on the endless belt are passed through the gap between the support cylinder and the impression cylinder or the web to be printed, a bulge arises in the resilient material of the cliché and thus a deformation work or a backward deformation force. This form-changing force, which can also be called the resistance of the cliché, only occurs when printing on, but not when there is a distance between the cliché and the web to be printed, as is the case in the non-printing state. This deformation force changes when the plate passes through the pressure gap in accordance with the design of the plate. In a certain operating state, this deformation force can be greater during printing or can be greater than the maximum driving force that can be transmitted to the endless belt by means of the drive via the pins of the pin wheels. In such a case, this will result in the perforations of the endless belt skipping over the pin wheels, which of course means that the register accuracy is lost and the printing result becomes unusable. In order to solve this problem, an additional drive is proposed in the known flexographic printing machine, that is to say a drive which, in addition to the torque which is positively transmitted to the endless belt via the pin wheels, transmits its torque to the endless belt via frictional engagement. This additional drive acts on the support cylinder as a drive roller on the endless belt, with the support cylinder being freely rotatable relative to the two pin wheels. Since the backward shaping work during printing only occurs when the endless belt rotates, if there is a cliché in the printing nip where the shaping work occurs, but it certainly corresponds to a frequently occurring case that the cliché is not continuous over the circumference of the endless belt is provided, times arise during printing in which the deformation force also disappears. The shape change work also changes as the cliché passes through the printing nip. The size of the deformation work also depends on the printing area of the printing block located in the printing gap. In order to take account of this changing deformation force, a complicated control device is provided in the known flexographic printing press. This control device has sensor elements for the continuous detection of a variable which is at least proportional to the deformation force and which are switched on in the drive in the area of the pin wheels. The Measurement data must be forwarded via slip rings. The sensor elements are based on a force or torque measurement with the help of strain gauges. The control device also includes a clutch and a brake, which are part of a control loop and via which the additional drive on the support cylinder is influenced in a regulating manner. The additional drive is removed from the machine drive. The drive via the pin wheels is also derived from the machine drive. In this known flexographic printing machine, the unit is formed from pinwheels and support cylinders which can be rotated relative to one another, the drive via the pin wheels together and the additional drive via the support cylinder being introduced into the endless belt alone. It is disadvantageous that the introduction of the drive on the one hand and the additional drive on the other hand is not easy to implement in the coaxial design between pin wheels and support cylinders and due to the cramped conditions there. Furthermore, these sensitive parts and in particular the sensor elements of the control device are located in an area of the flexographic printing machine in which they are exposed to washing water and other cleaning agents and also to the paint. In addition, the mechanical coupling of the pin wheels via the common drive is susceptible to wear, which can have a negative effect on the register accuracy.

Aus der EP-OS 308 367 ist eine Flexodruckmaschine bekannt, bei der der Gegendruckzylinder bereits ortsfest im Maschinenrahmen gelagert ist, so daß sich bei einem Anstellvorgang die Bahnspannungsverhältnisse vorteilhaft nicht ändern. Allerdings setzt dies voraus, daß der Stützzylinder gegenüber dem Maschinenrahmen zu Anstellzwecken beweglich vorgesehen ist. Die Lager des Stützzylinders sind in wenigstens zwei Richtungen und die Lager des Spannzylinders in wenigstens einer Richtung im Maschinenrahmen verschiebbar angeordnet. Es sind zwei Antriebsaggregate für den Spannzylinder einerseits und für den Stützzylinder andererseits vorgesehen, wobei es offen bleibt, ob und wie diese beiden Antriebe aufeinander abgestimmt sind. Darüberhinaus ist noch ein Maschinenantrieb vorgesehen, über welchen der Gegendruckzylinder angetrieben wird.A flexographic printing press is known from EP-OS 308 367, in which the impression cylinder is already mounted in a stationary manner in the machine frame, so that the web tension conditions advantageously do not change during a setting process. However, this presupposes that the support cylinder is movable relative to the machine frame for adjustment purposes. The bearings of the support cylinder are arranged to be displaceable in at least two directions and the bearings of the clamping cylinder in at least one direction in the machine frame. There are two drive units for the tensioning cylinder on the one hand and for the support cylinder on the other hand, it remains open whether and how these two drives are coordinated. In addition, there is another Machine drive is provided, via which the impression cylinder is driven.

Die DE-OS 41 00 871 zeigt eine Flexodruckmaschine mit einem ebenfalls ortsfest im Maschinenrahmen gelagerten Gegendruckzylinder. Unter Vermeidung einer komplizierten Regeleinrichtung sind ein Antrieb über die Stifträder und ein Zusatzantrieb für das Endlosband aufeinander abgestimmt. Der Zusatzantrieb wird über den Spannzylinder auf das Endlosband aufgebracht. Der Stützzylinder ist hingegen freilaufend ausgebildet, verfügt also über keinen Antrieb. Es ist eine Stelleinrichtung für die Einsteuerung des Zusatzantriebs vorgesehen, über die eine auf das Endlosband einwirkende Zusatzkraft so einsteuerbar ist, daß sie einerseits beim Drucken größer als die Differenz zwischen der nach rückwärts gerichteten Formänderungskraft beim Durch-tritt des Klischees durch den Spalt zwischen Bahn und Stützzylinder und der maximal von den Stifträdern auf das Endlosband übertragenen Kraft und andererseits beim Nicht-Drucken kleiner als die maximal von den Stifträdern auf das Endlosband übertragbare Kraft ist.DE-OS 41 00 871 shows a flexographic printing machine with an impression cylinder which is also fixed in the machine frame. While avoiding a complicated control device, a drive via the pin wheels and an additional drive for the endless belt are coordinated. The additional drive is attached to the endless belt via the tensioning cylinder. The support cylinder, on the other hand, is designed to run freely, ie it has no drive. An actuating device is provided for the control of the additional drive, via which an additional force acting on the endless belt can be controlled in such a way that, on the one hand, when printing, it is greater than the difference between the backward deformation force when the cliché passes through the gap between the web and Support cylinder and the maximum force transmitted from the pin wheels to the endless belt and, on the other hand, when not printing is smaller than the maximum force that can be transmitted from the pin wheels to the endless belt.

In vielen Fällen wird jedoch das auf dem Endlosband befindliche Klischee nicht symmetrisch zu vertikalen Längsmittelebene der Flexodruckmaschine ausgebildet bzw. aufgebracht sein, hieraus resultiert eine unterschiedlich große Beanspruchung der Perforation auf der einen Seite der Maschine gegenüber der Perforation auf der anderen Seite der Maschine. Das Stiftrad auf der einen Seite wird einen größeren Anteil des Antriebsmomentes als das Stiftrad auf der anderen Seite übertragen, um die jeweiligen Anteile der Formänderungsarbeit zu überwinden. Da das Endlosband mit den aufgebrachten Klischees einen quasielastischen Körper darstellt, wirkt sich eine ungleichmäßige Beanspruchung bzw. ein ungleichmäßiger Antrieb infolge relativer Winkellagenverdrehung nachteilig auf die Registerhaltigkeit rechts und links aus. In der Folge können sich ungleichmäßige Auflagen (Lochlaibungsdruck) im Bereich der Perforationen rechts und links an den beiden Stifträdern ergeben. Auch ein ungleichmäßiger Verschleiß stellt sich ein, wodurch die Probleme nur noch größer werden. Dies kann letztendlich dazu führen, daß das stärker belastete Stiftrad gegenüber den zugehörigen Perforationen des Endlosbandes überspringt, so daß in der Folge ein unbrauchbares Druckergebnis entsteht.In many cases, however, the cliché on the endless belt will not be designed or applied symmetrically to the vertical longitudinal center plane of the flexographic printing machine, which results in different levels of stress on the perforation on one side of the machine compared to the perforation on the other side of the machine. The pin wheel on the one hand transmits a larger proportion of the drive torque than the pin wheel on the other side in order to overcome the respective proportions of the deformation work. Since the endless belt with the applied clichés represents a quasi-elastic body, an uneven load or an uneven drive due to relative rotation of the angular position has a disadvantageous effect on the register accuracy on the right and left. As a result, uneven layers (perforation reveal pressure) in the area of the perforations on the right and left can adhere to the result in both pin wheels. Uneven wear also occurs, which only increases the problems. Ultimately, this can lead to the pin wheel, which is subject to greater stress, jumping over the associated perforations of the endless belt, so that an unusable printing result is produced as a result.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Flexodruckmaschine der eingangs beschriebenen Art mit mindestens einem Druckwerk, vorzugsweise jedoch mit mehreren Druckwerken für Mehrfarbendruck, bereitzustellen, mit dem im Verbund mit weiteren gleichartigen Druckwerken mit verbesserter Registerhaltigkeit gedruckt werden kann, und zwar ohne daß die Gefahr besteht, daß die Grenze des Überspringens eines Stiftrades gegenüber seinen Perforationen am Endlosband besteht.The invention is therefore based on the object of providing a flexographic printing machine of the type described at the outset with at least one printing unit, but preferably with a plurality of printing units for multi-color printing, with which printing can be carried out in conjunction with other similar printing units with improved register accuracy, without the risk there is a limit to the skipping of a pin wheel compared to its perforations on the endless belt.

Erfindungsgemäß wird dies bei der Flexodruckmaschine der eingangs beschriebenen Art dadurch erreicht, daß die beiden Stifträder frei gegeneinander verdrehbar gelagert sind, daß der Antrieb für die beiden Stifträder in zwei separat steuerbare Teilantriebe aufgeteilt ist, daß eine Meßeinrichtung für die momentanen Winkellagen der beiden Stifträder zueinander und die momentanen Antriebsmomente der beiden Teilantriebe zueinander vorgesehen ist, und daß eine Regeleinrichtung vorgesehen ist, die einerseits zum Ausregeln gleich großer Antriebsmomente über die beiden Teilantriebe für die Stifträder ausgebildet ist und andererseits - bei Überschreitung eines Grenzwertes dieser vorgenannten Antriebsmomente - zum Einleiten eines an die Erfordernisse angepassten Zusatzmomentes über den Zusatzantrieb des Stützzylinders auf das Endlosband dient.According to the invention, this is achieved in the flexographic printing machine of the type described in the introduction in that the two pin wheels are freely rotatable relative to one another, in that the drive for the two pin wheels is divided into two separately controllable partial drives, that a measuring device for the current angular positions of the two pin wheels relative to one another and the instantaneous drive torques of the two sub-drives are provided to each other, and that a control device is provided which is designed on the one hand to compensate for drive torques of the same size via the two sub-drives for the pin wheels and on the other hand - if a limit value of these aforementioned drive torques is exceeded - to initiate a requirement adjusted additional torque via the additional drive of the support cylinder on the endless belt.

Die Erfindung geht von der Erkenntnis aus, darauf hinzuwirken, daß über beide Stifträder im wesentlichen jeweils gleich große Antriebsteile auf die beiden Perforationen des Endlosbandes übertragen werden. Sobald das über das eine Stiftrad auf die eine Perforation des Endlosbandes infolge unsymmetrisch zur vertikalen Längsmittelebene der Flexodruckmaschine anfallender und zu überwindender Formänderungsarbeit auf Kosten des über das andere Stiftrad zu übertragenden Antriebsmomentes ansteigt, erfolgt eine Ausregelung derart, daß das größere Antriebsmoment verkleinert und das kleinere Antriebsmoment vergrößert wird, um die beiden rechts und links übertragenen Antriebsmomente möglichst schnell wieder auf einen gleich großen Wert zu bringen. Dieser gleich große Wert kann und wird im Laufe des Durchtrittes eines Klischees durch den Druckspalt schwanken, also selbst zeitlich größer und kleiner werden. Das insgesamt über die Stifträder zu übertragende Antriebsmoment wird insoweit auf zwei Teilantriebsmomente aufgeteilt, so daß bei einem Anwachsen des Gesamtantriebsmomentes der Stifträder jedes Teilantriebsmoment nur um den halben Betrag anwächst. Dies erbringt den Vorteil, daß der Grenzwert, bei dem die Stifträder an den Perforationen überspringen, bei ansteigender Formänderungsarbeit sehr viel später erst erreicht wird. Die Gefahr des Überspringens der Stifträder ist damit erheblich gemindert. Voraussetzung für diese Arbeitsweise ist natürlich, daß die beiden Stifträder nicht mehr wie bisher mechanisch durch einen gemeinsamen Antrieb gekoppelt sind, sondern daß zwei separat steuerbare Teilantriebe, jeweils für nur eines der beiden Stifträder vorgesehen sind. Über die Meßeinrichtung werden die momentanen Winkellagen der beiden Stifträder zueinander kontinuierlich überwacht. Eine unsymmetrisch zur vertikalen Längsmittelebene auftretende Formänderungsarbeit äußert sich in einer Abweichung der momentanen Winkellagen der beiden Stifträder zueinander. In der Folge würden sich unterschiedliche Antriebsmomente der beiden Teilantriebe einstellen. Die Regeleinrichtung sorgt jedoch dafür, daß dem entgegengewirkt wird, bis die beiden Antriebsmomente über die beiden Teilantriebe für die Stifträder wiederum gleich groß sind. Da das Endlosband mit dem aufgebrachten Klischee als ein quasielastischer Körper anzusehen ist, ist diese Ausregelung möglich, und es ergeben sich gleichmäßige Belastungen im Bereich der Perforationen an den Stifträdern rechts und links. Der Lochlaibungsdruck rechts und links ist gleich, und auch der Verschleiß wird sich gleichmäßig einstellen, so daß sich insgesamt auch eine wesentlich erhöhte Lebensdauer des Endlosbandes mit dem Klischee ergibt. Erstaunlich und signifikant ist dabei jedoch vor allen Dingen die Verbesserung der Passergenauigkeit. Änderungen der Winkellagen rechts und links zueinander werden immer wieder ausgeglichen und beseitigt, so daß sich diese nicht negativ als Passerverschlechterung auf die nachfolgenden Druckwerke auswirken können. Es resultiert eine bessere Druckqualität. Durch die Maßnahme, den Lochlaibungsdruck hinsichtlich eines Grenzwertes bei den Antriebsmomenten rechts und links nicht zu überschreiben und ein angepaßtes Zusatzmoment, also jeweils entsprechend den Erfordernissen, über den Zusatzantrieb des Stützzylinders auf das Endlosband einzubringen, wird eine erhebliche Sicherheitsschwelle eingehalten.The invention is based on the knowledge of working to ensure that essentially the same drive parts are transmitted to the two perforations of the endless belt via both pin wheels. As soon as that via the pin wheel on the one perforation of the endless belt due to asymmetrical The vertical longitudinal center plane of the flexographic printing machine to be overcome and the deformation work to be overcome increases at the expense of the drive torque to be transmitted via the other pinwheel, the adjustment is carried out in such a way that the larger drive torque is reduced and the smaller drive torque is increased by the two drive torques transmitted on the right and left again as quickly as possible to bring an equal value. This equally large value can and will fluctuate in the course of the passage of a cliché through the pressure gap, that is, it can become larger and smaller in time. The total drive torque to be transmitted via the pin wheels is divided into two partial drive moments so that each partial drive torque increases by only half the amount when the total drive torque of the pin wheels increases. This has the advantage that the limit value at which the pin wheels skip at the perforations is only reached much later with increasing work on the shape change. The risk of the pin wheels skipping is thus considerably reduced. A prerequisite for this mode of operation is, of course, that the two pin wheels are no longer mechanically coupled as before by a common drive, but that two separately controllable partial drives are each provided for only one of the two pin wheels. The instantaneous angular positions of the two pin wheels relative to one another are continuously monitored via the measuring device. A work of deformation occurring asymmetrically to the vertical longitudinal center plane manifests itself in a deviation of the instantaneous angular positions of the two pin wheels from one another. As a result, different drive torques of the two partial drives would occur. However, the control device ensures that this is counteracted until the two drive torques on the two partial drives for the pin wheels are again the same size. Since the endless belt with the applied cliché is to be regarded as a quasi-elastic body, this regulation is possible, and there are even loads in the area of the perforations on the pin wheels on the right and left. The perforation reveal pressure on the right and left is the same, and so is that Wear will occur evenly, so that overall there is a significantly increased lifespan of the endless belt with the cliché. Above all, however, the improvement in register accuracy is astonishing and significant. Changes in the angular positions to the right and left to one another are always compensated for and eliminated, so that these cannot have a negative effect on the subsequent printing units as a deterioration in the register. The result is better print quality. As a result of the measure not to overwrite the perforation reveal pressure with regard to a limit value for the drive torques on the right and left and to introduce an adapted additional torque, that is, in each case according to the requirements, via the additional drive of the support cylinder onto the endless belt, a considerable safety threshold is maintained.

Die beiden Teilantriebe zur Synchronisation der momentanen Winkellagen der beiden Stifträder können durch eine elektrische Welle miteinander verbunden sein, wie sie auch in der Drucktechnik bekannt ist. Damit stehen die beiden Stifträder drehwinkelsynchron miteinander in Verbindung. Eine mechanische Kopplung zwischen den beiden Stifträdern kommt vorteilhaft in Fortfall.The two partial drives for synchronizing the current angular positions of the two pin wheels can be connected to one another by an electrical shaft, as is also known in printing technology. This means that the two pin wheels are connected to each other at a rotational angle. A mechanical coupling between the two pin wheels is advantageously eliminated.

Die beiden Teilantriebe können jeweils einen Elektromotor aufweisen, mit dem jeweils ein Drehgeber als Bestandteil der Meßeinrichtung zur Feststellung der momentanen Winkellagen der beiden Stifträder verbunden ist. Bei diesen Elektromotoren handelt es sich insbesondere um digital gesteuerte Einzelmotore, die auch untereinander je Druckwerk über elektrische Wellen drehwinkelsynchron in Verbindung stehen können. Die neue Antriebskonzeption eliminiert das gesamte aufwendige und störanfällige System aus dem Stand der Technik. Mit der neuen Meßeinrichtung werden die momentanen Antriebsmomente der beiden Stifträder über je eine Einrichtung zum Messen der momentanen Stromaufnahme jedes der beiden Elektromotore unmittelbar gemessen. Die Stromaufnahme ist proportional zu dem Antriebsmoment und kann insoweit unmittelbar gemessen und für Regelzwecke weiterverarbeitet werden. Das jeweilige Antriebsmoment entspricht dem Teilmoment, welches über das Stiftrad auf die jeweilige Perforation des Endlosbandes übertragen wird. Auch die Regeleinrichtung ist digital ausgebildet. Sie regelt den Elektromotor für das rechte Stiftrad und den Elektromotor für das linke Stiftrad in ihrer relativen Winkellage zueinander so aus, bis eine gleichgewichtige Momentenaufteilung erreicht ist.The two partial drives can each have an electric motor, to each of which a rotary encoder is connected as part of the measuring device for determining the instantaneous angular positions of the two pin wheels. These electric motors are, in particular, digitally controlled individual motors, which can also be connected to one another per printing unit via electrical shafts in synchronism with the angle of rotation. The new drive concept eliminates the entire complex and fault-prone state-of-the-art system. With the new measuring device, the instantaneous drive torques of the two pinwheels are measured directly via a device for measuring the instantaneous current consumption of each of the two electric motors. The current consumption is proportional to the drive torque and can be immediately measured and processed for control purposes. The respective drive torque corresponds to the partial torque which is transmitted to the respective perforation of the endless belt via the pin wheel. The control device is also digital. It regulates the electric motor for the right pinwheel and the electric motor for the left pinwheel in their relative angular position to each other until an equal moment distribution is achieved.

Einer der beiden Teilantriebe für die beiden Stifträder ist als Führungsantrieb für die Regeleinrichtung vorgesehen, während der andere Teilantrieb als Nachfolgeantrieb ausgebildet ist. Bei Abweichungen voneinander werden die beiden Antriebe immer gegenläufig gerichtet. Es ist an sich gleichgültig, welchen der beiden Teilantriebe man als Führungsantrieb benutzt und welchen als Nachfolgeantrieb. Sinnvoll ist es jedoch, daß der als Führungsantrieb dienende Teilantrieb koaxial zu der gemeinsamen Achse der Stifträder und des Stützzylinders angeordnet ist, damit ein möglichst kurzer Antriebsweg für den Führungsantrieb genutzt werden kann.One of the two partial drives for the two pin wheels is provided as a guide drive for the control device, while the other partial drive is designed as a follow-up drive. In the event of deviations from one another, the two drives are always directed in opposite directions. It is in itself irrelevant which of the two partial drives is used as a guide drive and which as a follow-up drive. However, it makes sense that the partial drive serving as the guide drive is arranged coaxially with the common axis of the pin wheels and the support cylinder, so that the shortest possible drive path can be used for the guide drive.

Der Zusatzantrieb für den Stützzylinder kann koaxial zu der gemeinsamen Achse der Stifträder und des Stützzylinders vorgesehen sein und einen Elektromotor aufweisen, mit dem als Bestandteil der Meßeinrichtung ein Drehgeber verbunden ist, wobei der als Nachfolgeantrieb dienende Teilantrieb versetzt zur gemeinsamen Achse der Stifträder und des Stützzylinders vorgesehen ist. An sich könnte man die Lage und den Ansatzpunkt des Zusatzantriebes und des Nachfolgeantriebes, die auf der gleichen Seite der Maschine angeordnet sind, gegeneinander auch vertauschen, um eine besonders schnelle Eingriffsmöglichkeit für den Zusatzantrieb zu haben, der ja das Überspringen der Stifträder verhindern soll, erscheint es sinnvoll, den Zusatzantrieb koaxial anzuordnen und hinsichtlich des Nachfolgeantriebes eine zusätzliche Übertragungsstufe zur Überbrückung der parallelen Achsen vorzusehen.The additional drive for the support cylinder can be provided coaxially to the common axis of the pin wheels and the support cylinder and have an electric motor to which a rotary encoder is connected as a component of the measuring device, the partial drive serving as the follower drive being offset from the common axis of the pin wheels and the support cylinder is. As such, the position and the starting point of the additional drive and the subsequent drive, which are arranged on the same side of the machine, could also be exchanged for one another in order to have a particularly rapid intervention possibility for the additional drive, which is intended to prevent the pin wheels from jumping over it makes sense to arrange the additional drive coaxially and to provide an additional transmission stage for bridging the parallel axes with regard to the subsequent drive.

Der Stützzylinder und/oder der Spannzylinder kann zur Verringerung des Durchmessers und des Massenträgheitsmomentes im wesentlichen aus einem Kohlefaserverbundwerkstoff bestehen. Damit verringert sich das Massenträgheitsmoment um etwa 80 %, was die Grundlage für eine raschere Regelung ist. Die Verringerung des Durchmessers führt auch zur Herabsetzung der minimalen Länge des Endlosbandes und damit vielfach zur Reduzierung der Klischeekosten bei Mehrfach-Drucknutzen in Laufrichtung des Druckwerks.The support cylinder and / or the clamping cylinder can essentially consist of a carbon fiber composite material in order to reduce the diameter and the moment of inertia. This reduces the moment of inertia by about 80%, which is the basis for faster control. The reduction in the diameter also leads to a reduction in the minimum length of the endless belt and thus in many cases to a reduction in printing plate costs in the case of multiple printing in the direction of the printing unit.

Für mehrere Druckwerke, wie sie üblicherweise bei einer Flexodruckmaschine für Mehrfarbendruck vorkommen, ist eine übergeordnete weitere Regeleinrichtung vorgesehen, über die die Drehgeber der als Führungsantriebe dienenden Teilantriebe der Druckwerke miteinander, die Drehgeber der als Nachfolgeantriebe dienenden Teilantriebe der Druckwerke miteinander und die Drehgeber der Zusatzantriebe der Druckwerke miteinander verbunden sind.For several printing units, as is usually the case with a flexographic printing machine for multi-color printing, a higher-level control device is provided, via which the rotary encoders of the partial drives of the printing units serving as guide drives, the rotary encoders of the partial drives of the printing units serving as follow-up drives, and the rotary encoders of the additional drives Printing units are interconnected.

Die Erfindung wird anhand eines bevorzugten Ausführungsbeispieles weiter erläutert und beschrieben. Es zeigen:

Figur 1
die Darstellung der wesentlichen Teile eines Druckwerkes, teilweise geschnitten,
Figur 2
die beispielsweise rechte Seite eines Druckwerks in vergrößernder Darstellung,
Figur 3
die beispielsweise linke Seite eines Druckwerkes in vergrößernder Darstellung,
Figur 4
einen Vertikalschnitt durch ein Druckwerk mit seinen wesentlichen Teilen und
Figur 5
die wesentlichen Elemente einer Regeleinrichtung eines Druckwerkes sowie der Flexodruckmaschine.
The invention is further explained and described on the basis of a preferred exemplary embodiment. Show it:
Figure 1
the representation of the essential parts of a printing unit, partially cut,
Figure 2
the right side of a printing unit, for example, in an enlarged view,
Figure 3
the left side of a printing unit, for example, in an enlarged view,
Figure 4
a vertical section through a printing unit with its essential parts and
Figure 5
the essential elements of a control device of a printing unit and the flexographic printing machine.

Figur 1 läßt schematisch einen Maschinenrahmen 1 eines Druckwerks 2 erkennen. Im Maschinenrahmen 1 ist ein Stützzylinder 3 in zu Anstellzwecken verschiebbaren Lagern drehbar gelagert. Der Stützzylinder 3 weist eine der Arbeitsbreite des Druckwerkes 2 bzw. der Flexodruckmaschine entsprechende Breite auf. Links von dem Stützzylinder 3 ist ein Stiftrad 4 und rechts von dem Zylinder 3 ein Stiftrad 5 vorgesehen. Die Stifträder 4 und 5 sind sowohl gegeneinander wie auch gegenüber dem Stützzylinder 3 drehbar.Figure 1 shows schematically a machine frame 1 of a printing unit 2. In the machine frame 1, a support cylinder 3 is rotatably mounted in bearings which can be displaced for adjustment purposes. The support cylinder 3 has a width corresponding to the working width of the printing unit 2 or the flexographic printing press. A pin wheel 4 is provided to the left of the support cylinder 3 and a pin wheel 5 is provided to the right of the cylinder 3. The pin wheels 4 and 5 are rotatable with respect to each other as well as with respect to the support cylinder 3.

Wie Figur 4 erkennen läßt, ist dem Stützzylinder 3 ein Gegendruckzylinder 6 zugeordnet, der in vorzugsweise ortsfest im Maschinenrahmen 1 angeordneten Lagern aufgenommen ist. Um Umlenkrollen 7 und den Gegendruckzylinder 6 ist die zu bedruckende Bahn 8 geführt, die gemäß Pfeil 9 durch das Druckwerk läuft. Dem Stützzylinder 3 und den Stifträdern 4 und 5 ist ein Spannzylinder 10 zugeordnet. Um den Stützzylinder 3 und die Stifträder 4 und 5 einerseits sowie um den Spannzylinder 10 andererseits ist ein Endlosband 11 geschlungen, welches mit Klischees in einfachem oder mit mehrfachem Nutzen besetzt ist. Je nach der Länge des Endlosbandes 11 ist der Spannzylinder 10 auf einen entsprechenden Abstand zum Stützzylinder 3 verfahrbar bzw. einstellbar. In strichpunktierter Linienführung ist der Spannzylinder 10' dargestellt, wie er bei einem Endlosband 11 minimaler Länge eingestellt wird. Da der Gegendruckzylinder 6 vorzugsweise ortsfest im Maschinenrahmen 1 gelagert ist, ist die Einheit aus Stützzylinder 3, Stifträdern 4, 5 und Spannzylinder 10 über eine Trageinrichtung 12 gehalten und zu Anstellzwecken etwa um das Maß e verschiebbar. Jedes Druckwerk besitzt eine Farbübertragungseinrichtung 13 mit einer Rasterwalze 14 und einem Rakel 15. Eine zweite Rasterwalze 16 kann auf einem Schwenkarm 17 gelagert sein.As can be seen in FIG. 4, the back-up cylinder 3 is assigned a counter-pressure cylinder 6, which is accommodated in bearings which are preferably arranged fixed in the machine frame 1. The web 8 to be printed is guided around deflection rollers 7 and the impression cylinder 6 and runs through the printing unit according to arrow 9. A clamping cylinder 10 is assigned to the support cylinder 3 and the pin wheels 4 and 5. An endless belt 11 is looped around the support cylinder 3 and the pin wheels 4 and 5 on the one hand and around the tension cylinder 10 on the other hand, which is filled with clichés in single or multiple uses. Depending on the length of the endless belt 11, the tensioning cylinder 10 can be moved or adjusted to a corresponding distance from the support cylinder 3. In dash-dotted lines, the tensioning cylinder 10 'is shown as it is set with an endless belt 11 of minimal length. Since the impression cylinder 6 is preferably mounted fixed in the machine frame 1, the unit comprising the support cylinder 3, pin wheels 4, 5 and tensioning cylinder 10 is held by a carrying device 12 and can be displaced by the dimension e for adjustment purposes. Each printing unit has an ink transfer device 13 with an anilox roller 14 and a doctor blade 15. A second anilox roller 16 can be mounted on a swivel arm 17.

Dem z. B. rechts angeordneten Stiftrad 5 (Figur 1) ist ein erster Teilantrieb 18 zugeordnet, der separat steuer- bzw. regelbar ausgebildet ist. Der Teilantrieb 18 dient nur zum Antrieb des Stiftrades 5. Der Teilantrieb 18 weist einen Elektromotor 19 und einen Drehgeber 20 auf, der die Winkellage des Stiftrades 5 überwacht. Der Drehgeber 20 ist Bestandteil einer Meßeinrichtung 21 zur Feststellung der momentanen Winkellage des Stiftrades 5. Weiterhin ist eine Meßeinrichtung 22 für das momentane Antriebsmoment des Stiftrades 5 vorgesehen. Der Teilantrieb 18 ist hier als Führungsantrieb vorgesehen, weil er koaxial zu der gemeinsamen Achse 23 des Stützzylinders 3 und der Stifträder 4, 5 vorgesehen ist.The z. B. right-hand pin wheel 5 (Figure 1) is assigned a first partial drive 18 which is separately controllable or adjustable. The partial drive 18 is used only for Drive of the pin wheel 5. The partial drive 18 has an electric motor 19 and a rotary encoder 20 which monitors the angular position of the pin wheel 5. The rotary encoder 20 is part of a measuring device 21 for determining the current angular position of the pin wheel 5. Furthermore, a measuring device 22 is provided for the current drive torque of the pin wheel 5. The partial drive 18 is provided here as a guide drive because it is provided coaxially with the common axis 23 of the support cylinder 3 and the pin wheels 4, 5.

Ebenso wie der Teilantrieb 18 dem Stiftrad 5 zugeordnet ist, ist ein Teilantrieb 24 für das Stiftrad 4 vorgesehen. Der Teilantrieb 24 weist wiederum einen Elektromotor 25 und einen Drehgeber 26 auf. Dem Teilantrieb 24 ist eine Meßeinrichtung 27 zur Feststellung der momentanen Winkellage des Stiftrades 4 sowie eine Meßeinrichtung 28 für das momentane Antriebsmoment des Stiftrades 5 zugeordnet. Die Achse 29 des Teilantriebes 24 ist versetzt zur Achse 23 vorgesehen. Um den Teilantrieb 24 auf das Stiftrad 4 zu bringen, ist eine Getriebestufe 30, die einen Riemen 31 aufweisen kann, in der aus den Figuren 1 und 3 ersichtlichen Weise vorgesehen.Just as the partial drive 18 is assigned to the pin wheel 5, a partial drive 24 is provided for the pin wheel 4. The partial drive 24 in turn has an electric motor 25 and a rotary encoder 26. A measuring device 27 for determining the current angular position of the pin wheel 4 and a measuring device 28 for the current drive torque of the pin wheel 5 are assigned to the partial drive 24. The axis 29 of the partial drive 24 is provided offset to the axis 23. In order to bring the partial drive 24 onto the pin wheel 4, a gear stage 30, which can have a belt 31, is provided in the manner shown in FIGS. 1 and 3.

Koaxial zur Achse 23 ist ein Zusatzantrieb 32 vorgesehen, der ausschließlich dem Stützzylinder 3 zugeordnet ist. Der Zusatzantrieb 32 weist einen Elektromotor 33 und einen Drehgeber 34 auf. Auch der Zusatzantrieb 32 verfügt über eine Meßeinrichtung 35 zur Feststellung des momentanen Zusatzdrehmomentes des Stützzylinders 3. Eine weitere Meßeinrichtung 36 an dem Zusatzantrieb 32 dient zur Erfassung des momentanen Antriebsmomentes, welches über den Stützzylinder 3 auf das Endlosband 11 übertragen wird.An additional drive 32 is provided coaxially to the axis 23 and is assigned exclusively to the support cylinder 3. The auxiliary drive 32 has an electric motor 33 and a rotary encoder 34. The additional drive 32 also has a measuring device 35 for determining the instantaneous additional torque of the support cylinder 3. Another measuring device 36 on the additional drive 32 serves to record the instantaneous drive torque which is transmitted to the endless belt 11 via the support cylinder 3.

Figur 5 läßt erkennen, wie die Elektromotore 25, 33 des Teilantriebes 24 und des Zusatzantriebes 32 mit einer Regeleinrichtung 37 verbunden sind, die dem einzelnen Druckwerk Zugeordnet ist. Von den Meßeinrichtungen 21 und 22 des als Führungsantrieb ausgebildeten Teilantriebes 18 führt eine elektrische Leitung 38 zur Regeleinrichtung 37, von der aus die Nachregelung des Teilantriebes 24 und des Zusatzantriebes 32 erfolgt. Eine elektrische Leitung 39 führt von einer übergeordneten Regeleinrichtung 40 für die gesamte Flexodruckmaschine zu dem Elektromotor 19 des Teilantriebes 18. Es versteht sich, daß die Teilantriebe 18 und 24 auch ihre Funktion tauschen können. Es ist jedoch sinnvoll, den genaueren Teilantrieb als Führungsantrieb zu wählen, nämlich den Teilantrieb, der nicht über eine Getriebestufe zur Überbrückung einer Anordnung mit versetzten Achsen erforderlich ist. Eine Leitung 41 führt von den Meßeinrichtungen 21 und 22 des Teilantriebes 18 zu der übergeordneten Regeleinrichtung 40. Die Meßeinrichtungen 21, 22, 27, 28, 35, 36 dienen zum Erfassen der jeweiligen Winkellagen bzw. der jeweiligen Drehmomente. Die Regeleinrichtung 37 jedes Druckwerkes regelt diese Winkellagen und Drehmomente relativ zueinander. Die übergeordnete Regeleinrichtung 40 regelt nicht nur die relativen Winkellagen und die Drehmomente untereinander, sondern auch noch die Druckgeschwindigkeit durch die gesamte Flexodruckmaschine. Zur Verdeutlichung eines zweiten Druckwerkes sind nur die Leitungen 39' und 41' angedeutet. Es versteht sich, daß die übrigen Bestandteile ebenso vorgesehen sind, wie es anhand der Regeleinrichtung und Anordnung für das erste Druckwerk beschrieben worden ist. Weitere Druckwerke, z. B. 2', sind entsprechend der Anzahl der Druckwerke an die übergeordnete Regeleinrichtung 40 angeschlossen, wie dies in Figur 5 angedeutet ist.FIG. 5 shows how the electric motors 25, 33 of the partial drive 24 and the additional drive 32 are connected to a control device 37 which is assigned to the individual printing unit. An electrical line 38 leads from the measuring devices 21 and 22 of the partial drive 18 designed as a guide drive to the control device 37, from which the partial drive 24 and the auxiliary drive 32 are readjusted. An electrical line 39 leads from a higher-level control device 40 for the entire flexographic printing machine to the electric motor 19 of the partial drive 18. It goes without saying that the partial drives 18 and 24 can also exchange their function. However, it makes sense to choose the more precise partial drive as the guide drive, namely the partial drive, which is not required via a gear stage to bridge an arrangement with offset axes. A line 41 leads from the measuring devices 21 and 22 of the partial drive 18 to the higher-level control device 40. The measuring devices 21, 22, 27, 28, 35, 36 are used to detect the respective angular positions or the respective torques. The control device 37 of each printing unit controls these angular positions and torques relative to one another. The higher-level control device 40 not only controls the relative angular positions and the torques with one another, but also the printing speed through the entire flexographic printing machine. Only lines 39 'and 41' are indicated to illustrate a second printing unit. It goes without saying that the remaining components are also provided, as has been described with reference to the control device and arrangement for the first printing unit. Other printing units, e.g. B. 2 ', are connected to the higher-level control device 40 according to the number of printing units, as indicated in Figure 5.

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

11
- Maschinenrahmen- machine frame
22nd
- Druckwerk- printing unit
33rd
- Stützzylinder- support cylinder
44th
- Stiftrad- pin wheel
55
- Stiftrad- pin wheel
66
- Gegendruckzylinder- Impression cylinder
77
- Umlenkrolle- pulley
88th
- Bahn- Train
99
- Pfeil- arrow
1010th
- Spannzylinder- clamping cylinder
1111
- Endlosband- endless belt
1212th
- Trageinrichtung- carrying device
1313
- Farbübertragungseinrichtung- ink transfer device
1414
- Rasterwalze- Anilox roller
1515
- Rakel- Squeegee
1616
- Rasterwalze- Anilox roller
1717th
- Schwenkarm- swivel arm
1818th
- Teilantrieb- Partial drive
1919th
- Elektromotor- electric motor
2020th
- Drehgeber- encoder
2121
- Meßeinrichtung- measuring device
2222
- Meßeinrichtung- measuring device
2323
- Achse- axis
2424th
- Teilantrieb- Partial drive
2525th
- Elektromotor- electric motor
2626
- Drehgeber- encoder
2727
- Meßeinrichtung- measuring device
2828
- Meßeinrichtung- measuring device
2929
- Achse- axis
3030th
- Getriebestufe- gear stage
3131
- Riemen- straps
3232
- Zusatzantrieb- Additional drive
3333
- Elektromotor- electric motor
3434
- Drehgeber- encoder
3535
- Meßeinrichtung- measuring device
3636
- Meßeinrichtung- measuring device
3737
- Regeleinrichtung- control device
3838
- Leitung- Management
3939
- Leitung- Management
4040
- Regeleinrichtung- control device
4141
- Leitung- Management

Claims (9)

Flexodruckmaschine, insbesondere für Mehrfarbendruck, mit mindestens einem Druckwerk (2), das einen Maschinenrahmen (1), darin gelagerte Umlenkrollen (7), einen in vorzugsweise ortsfest im Maschinenrahmen (1) angeordneten Lagern aufgenommenen Gegendruckzylinder (6) zur Führung der zu bedruckenden Bahn (8), einen Stützzylinder (3), zwei dazu koaxial vorgesehene Stifträder (4, 5) und mindestens einen Spannzylinder (10) aufweist, um die ein mindestens ein Klischee tragendes und mit Perforationen für die Stifträder (4, 5) versehenes Endlosband (11) geführt ist, wobei eine dem Klischee des Endlosbandes (11) zugeordnete Farbübertragungseinrichtung (13), ein über die Stifträder (4, 5) auf das Endlosband (11) einwirkender Antrieb und ein über den gegenüber den Stifträdern frei drehbaren Stützzylinder (3) auf das Endlosband (11) einwirkender Zusatzantrieb (32) zum Verhindern des Überspringens der Perforationen des Endlosbandes (11) gegenüber den Stifträdern (4, 5) vorgesehen sind, dadurch gekennzeichnet, daß die beiden Stifträder (4, 5) frei gegeneinander verdrehbar gelagert sind, daß der Antrieb für die beiden Stifträder (5, 4) in zwei separat steuerbare Teilantriebe (18, 24) aufgeteilt ist, daß eine Meßeinrichtung (21, 27, 22, 28) für die momentanen Winkellagen der beiden Stifträder (5, 4) zueinander und die momentanen Antriebsmomente der beiden Teilantriebe (18, 24) zueinander vorgesehen ist, und daß eine Regeleinrichtung (37) vorgesehen ist, die einerseits zum Ausregeln gleich großer Antriebsmomente über die beiden Teilantriebe (18, 24) für die Stifträder (5, 4) ausgebildet ist und andererseits - bei Überschreitung eines Grenzwertes dieser vorgenannten Antriebsmomente - zum Einleiten eines an die Erfordernisse angepassten Zusatzmomentes über den Zusatzantrieb (32) des Stützzylinders (3) auf das Endlosband (11) dient.Flexographic printing machine, in particular for multi-color printing, with at least one printing unit (2), which has a machine frame (1), deflection rollers (7) mounted therein, a counter-pressure cylinder (6) accommodated in bearings which are preferably fixed in the machine frame (1) for guiding the web to be printed (8), a support cylinder (3), two pin wheels (4, 5) provided coaxially therewith and at least one tension cylinder (10) around which an endless belt (at least one cliché and provided with perforations for the pin wheels (4, 5)) 11), an ink transfer device (13) assigned to the cliché of the endless belt (11), a drive acting on the endless belt (11) via the pin wheels (4, 5) and a support cylinder (3) which can be freely rotated relative to the pin wheels. additional drive (32) acting on the endless belt (11) to prevent the perforations of the endless belt (11) from jumping over the pin wheels (4, 5) nd, characterized in that the two pin wheels (4, 5) are freely rotatable relative to one another, that the drive for the two pin wheels (5, 4) is divided into two separately controllable partial drives (18, 24), that a measuring device (21 , 27, 22, 28) for the current angular positions of the two pinwheels (5, 4) to one another and the current drive torques of the two sub-drives (18, 24) to one another, and that a control device (37) is provided, which on the one hand is used to regulate drive torques of the same size are formed for the pin wheels (5, 4) via the two partial drives (18, 24) and, on the other hand - if a limit value of these aforementioned drive torques is exceeded - for initiating an additional torque adapted to the requirements via the additional drive (32) of the support cylinder ( 3) on the endless belt (11). Flexodruckmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die beiden Teilantriebe (18, 24) zur Synchronisation der momentanen Winkellagen der beiden Stifträder (5, 4) durch eine elektrische Welle miteinander verbunden sind.Flexographic printing machine according to claim 1, characterized in that the two partial drives (18, 24) for synchronizing the instantaneous angular positions of the two pin wheels (5, 4) are connected to one another by an electrical shaft. Flexodruckmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die beiden Teilantriebe (18, 24) jeweils einen Elektromotor (19, 25) aufweisen, mit dem jeweils ein Drehgeber (20, 26) als Bestandteil der Meßeinrichtung (21, 27) zur Feststellung der momentanen Winkellagen der beiden Stifträder (5, 4) verbunden ist.Flexographic printing machine according to claim 1 or 2, characterized in that the two partial drives (18, 24) each have an electric motor (19, 25), with each of which an encoder (20, 26) as part of the measuring device (21, 27) for detection the current angular positions of the two pin wheels (5, 4) is connected. Flexodruckmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß als Meßeinrichtung (22, 28) für die momentanen Antriebsmomente der beiden Stifträder (5, 4) je eine Einrichtung zum Messen der momentanen Stromaufnahme jedes der beiden Elektromotore (19, 25) vorgesehen ist.Flexographic printing machine according to one of claims 1 to 3, characterized in that a device for measuring the instantaneous current consumption of each of the two electric motors (19, 25) is provided as the measuring device (22, 28) for the instantaneous drive torques of the two pin wheels (5, 4) is. Flexodruckmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß einer (18) der beiden Teilantriebe (18, 24) für die beiden Stifträder (5, 4) als Führungsantrieb für die Regeleinrichtung (37) vorgesehen ist, während der andere Teilantrieb (24) als Nachfolgeantrieb ausgebildet ist.Flexographic printing machine according to one of claims 1 to 4, characterized in that one (18) of the two partial drives (18, 24) for the two pin wheels (5, 4) is provided as a guide drive for the control device (37), while the other partial drive ( 24) is designed as a follow-up drive. Flexodruckmaschine nach Anspruch 5, dadurch gekennzeichnet, daß der als Führungsantrieb dienende Teilantrieb (18) koaxial zu der gemeinsamen Achse (23) der Stifträder (4, 5) und des Stützzylinders (3) angeordnet ist.Flexographic printing machine according to claim 5, characterized in that the partial drive (18) serving as a guide drive is arranged coaxially to the common axis (23) of the pin wheels (4, 5) and the support cylinder (3). Flexodruckmaschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Zusatzantrieb (32) für den Stützzylinder (3) koaxial zu der gemeinsamen Achse (23) der Stifträder (4, 5) und des Stützzylinders (3) vorgesehen ist und einen Elektromotor (33) aufweist, mit dem als Bestandteil der Meßeinrichtung (35) ein Drehgeber (34) verbunden ist, und daß der als Nachfolgeantrieb dienende Teilantrieb (24) versetzt zur gemeinsamen Achse (23) der Stifträder (4, 5) und des Stützzylinders (3) vorgesehen ist.Flexographic printing machine according to one of claims 1 to 6, characterized in that the additional drive (32) for the support cylinder (3) is provided coaxially with the common axis (23) of the pin wheels (4, 5) and the support cylinder (3) and an electric motor (33), to which a rotary encoder (34) is connected as part of the measuring device (35), and that as a follower drive serving partial drive (24) offset to the common axis (23) of the pin wheels (4, 5) and the support cylinder (3) is provided. Flexodruckmaschine nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Stützzylinder (3) und/oder der Spannzylinder (10) zur Verringerung des Durchmessers und des Massenträgheitsmomentes im wesentlichen aus einem Kohlefaserverbundwerkstoff besteht.Flexographic printing machine according to one of claims 1 to 7, characterized in that the support cylinder (3) and / or the clamping cylinder (10) consists essentially of a carbon fiber composite material in order to reduce the diameter and the moment of inertia. Flexodruckmaschine nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß für mehrere Druckwerke (2) eine übergeordnete weitere Regeleinrichtung (40) vorgesehen ist, über die die Drehgeber (20) der als Führungsantriebe dienenden Teilantriebe (18) der Druckwerke (2) miteinander, die Drehgeber (26) der als Nachfolgeantriebe dienenden Teilantriebe (24) der Druckwerke (2) miteinander und die Drehgeber (34) der Zusatzantriebe (32) der Druckwerke miteinander verbunden sind.Flexographic printing machine according to one of claims 1 to 8, characterized in that a superordinate further control device (40) is provided for a plurality of printing units (2), via which the rotary encoders (20) of the partial drives (18) of the printing units (2) serving as guide drives are interconnected , The rotary encoders (26) of the partial drives (24) of the printing units (2) serving as follow-up drives are connected to one another and the rotary encoders (34) of the additional drives (32) of the printing units are connected to one another.
EP95103735A 1994-03-24 1995-03-15 Flexographic printing machine particularly for multicolour printing Expired - Lifetime EP0676284B1 (en)

Applications Claiming Priority (2)

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DE4410132A DE4410132C2 (en) 1994-03-24 1994-03-24 Flexographic printing machine, in particular for multi-color printing
DE4410132 1994-03-24

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AT (1) ATE159458T1 (en)
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GB2345465B (en) * 1998-09-22 2002-11-06 Euramex Packaging Ltd In-line belt type printing apparatus
DE19850274C1 (en) * 1998-10-31 2000-05-25 Csat Computer Systeme Device for printing a label-free continuous film
DE10300502A1 (en) 2003-01-08 2004-07-29 Rosenberg Gmbh & Co Printing machine and method for printing on a printing web
FR2934199B1 (en) * 2008-07-25 2011-07-15 Cuir Ccm PRINTING MACHINE EQUIPPED WITH REMOVABLE FRAME CYLINDER
US20100089264A1 (en) * 2008-10-10 2010-04-15 Alrick Vincent Warner Absorbent Articles Having Distinct Graphics And Apparatus And Method For Printing Such Absorbent Articles
JP5389769B2 (en) * 2010-11-04 2014-01-15 有限会社 みさとみらい二十一 Printing apparatus using endless belt-shaped printing plate, printing method therefor, and method for mounting belt-shaped printing plate
DE102014101435B4 (en) 2014-02-05 2015-09-03 CONPRINTA GmbH & Co. KG Printing unit for a flexographic printing machine
CN110027329B (en) * 2019-05-10 2024-07-09 深圳市沃尔核材股份有限公司 Thermal printing apparatus and processing apparatus

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EP0308367A1 (en) * 1987-09-10 1989-03-22 Conprinta Ltd. Flexographic printing machine, particularly for preliminary printing
DE4100871A1 (en) * 1991-01-14 1992-07-16 Conprinta Ltd Flexographic printing press - has block belt tensioning cylinder forming auxiliary driving roller

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GR3025241T3 (en) 1998-02-27
CA2145137A1 (en) 1995-09-25
DE4410132A1 (en) 1995-09-28
ATE159458T1 (en) 1997-11-15
US5479855A (en) 1996-01-02
ES2110796T3 (en) 1998-02-16
JPH0839756A (en) 1996-02-13
EP0676284B1 (en) 1997-10-22
CA2145137C (en) 2004-05-04
DE4410132C2 (en) 1996-07-25
JP3140653B2 (en) 2001-03-05
DK0676284T3 (en) 1998-01-12
DE59500826D1 (en) 1997-11-27

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