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EP0337241B1 - Device for driving draw rolls of a web-fed printing press - Google Patents

Device for driving draw rolls of a web-fed printing press Download PDF

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Publication number
EP0337241B1
EP0337241B1 EP89105839A EP89105839A EP0337241B1 EP 0337241 B1 EP0337241 B1 EP 0337241B1 EP 89105839 A EP89105839 A EP 89105839A EP 89105839 A EP89105839 A EP 89105839A EP 0337241 B1 EP0337241 B1 EP 0337241B1
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EP
European Patent Office
Prior art keywords
speed
rotation
web
longitudinal shaft
driven
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.)
Expired - Lifetime
Application number
EP89105839A
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German (de)
French (fr)
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EP0337241A2 (en
EP0337241A3 (en
Inventor
Arnold Niedermaier
Anton Weis
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Albert Frankenthal AG
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Albert Frankenthal AG
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Publication date
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Publication of EP0337241A3 publication Critical patent/EP0337241A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/004—Electric or hydraulic features of drives
    • B41F13/0045—Electric driving devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/10—Constitutive elements of driving devices
    • B41P2213/20—Gearings
    • B41P2213/208—Harmonic drive

Definitions

  • the invention relates to a device for driving train roller pairs of a web-fed rotary printing press according to the preamble of claim 1.
  • a device of this kind is from Siemens / Energy & Automation vol. IX, no. 4, 1987, Berlin DE page 22.
  • the one input of the differential gear which is driven at a speed corresponding to the longitudinal shaft speed, is drivingly connected to the longitudinal shaft by means of a mechanical drive train indicated by a shaft.
  • the mechanical drive train mentioned is provided with a step gear. This must be adjusted each time the diameter of the forme cylinder changes, which can mean a high level of operating effort.
  • Another disadvantage is, of course, the structural outlay associated with a mechanical drive train of this type, including a step transmission.
  • FR-A 2 460 425 shows a drive device for a windable or windable web with two pulling devices, each of which has a differential gear with an output connected to the element to be driven and two inputs, one of which has a main motor for accomplishing the drive and one is connected to an auxiliary motor for regulating the web tension.
  • the two main motors are linked together in a cascade. However, no longitudinal shaft is used for this. Rather, the known arrangement is based on a constant drive of the main motors.
  • the auxiliary motors are only regulated depending on the web tension. Arrangements of this type can, however, prove to be very sluggish, so that there is a high risk of web breaks.
  • the drawing shows a block diagram of the drive device according to the invention assigned to a pull roller.
  • the pair of pull rollers 1 each comprises a driven roller and a non-driven roller rolling thereon.
  • a main motor 3 and a smaller auxiliary motor 4 are provided for driving the driven roller of the pair of draw rollers 1.
  • the main motor 3 has an output of about 25 kW, the auxiliary motor 4 of about 1 kW.
  • the main motor 3 and the auxiliary motor 4 are connected to the driven roller of the pair of pulling rollers 1 via a differential gear 5.
  • the main motor 3 and the auxiliary motor 4 are designed as DC motors, the speed of which is adapted to the speed of the longitudinal shaft 6, from which the drive of the printing units and the folder is derived.
  • the speed of the auxiliary motor 4 is also from the train, d. H. the tension of the paper web to be printed, depending.
  • the speed of the longitudinal shaft 6 is recorded by a pulse generator 7 driven by the latter.
  • the pulse generator 7 supplies pulse signals, which facilitates digital control of the motors 3, 4, the actual speed values of which can also be recorded by pulse generators.
  • the output signal of the pulse generator 7 forms the setpoint for a speed control loop 8 assigned to the main motor 3 and a speed control loop 9 assigned to the auxiliary motor 4.
  • the corresponding speed setpoint input of the control loop 8 or 9 is designated 10 or 11.
  • the speeds of the main motor 3 and the auxiliary motor 4 are also assigned by a respective Pulse generator 12 and 13 included, the output signals of which form the actual speed values for the control loops 8 and 9, respectively.
  • the corresponding actual value inputs of control loops 8 and 9 are designated 14 and 15, respectively.
  • the control circuit 8 assigned to the main motor 3 contains a speed controller 16, on which the speed setpoint input 10 and the speed actual value input 14 are located. Downstream of the speed controller 16 is a thyristor 17, which influences the energy supply to the main motor 3, as indicated by the signal line 18.
  • the thyristor 17 is a digitally controllable actuator. In the event of a deviation of the actual value entered into the controller 16 via the input 14 from the setpoint entered via the input 10 into the controller 16, the current supply to the main motor 3 is changed so that the deviation disappears.
  • the speed control circuit 9 assigned to the auxiliary motor 4 also contains a speed controller 19 which is followed by a thyristor 20 which influences the current supply to the auxiliary motor 4 via the signal line 21.
  • the speed controller 19 of the control circuit 9 has a third input 22, by means of which the speed setpoint value which can be input at the input 11 can be varied depending on the tension of the paper web to be printed.
  • the input 22 of the control loop 9 is accordingly the output of a web tension control loop 23 superordinate to the speed control loop 9. This results in a cascade control with an inner speed control loop and an outer, higher-level web tension control loop.
  • the web tension is recorded by means of a dancer roller 24 and a measuring element 25 assigned to it, the output of which is at the voltage actual value input 26 of a voltage regulator 27.
  • the voltage setpoint is specified by means of an adjustable potentiometer 28, the output of which is at the voltage setpoint input 29 of the voltage regulator 27.
  • the output of the voltage regulator 27 is located at the second setpoint input 22 of the speed regulator 19 of the subordinate speed control circuit 9. As already indicated above, this causes a voltage-dependent variation of the speed setpoint of the subordinate speed control circuit 9, which results in high accuracy and high security against web break etc.
  • the differential gear 5 connecting the main motor 3 and the auxiliary motor 4 with the driven roller of the pair of pulling rollers 1 is designed as a harmonic drive gear.
  • This contains, in a manner known per se, two rotating circular splines 30, 31, which are bridged by a so-called flex spline 32, which is received on a driven, oval wave generator 33.
  • the drive shaft 34 of the wave generator 33 is drivingly connected to the auxiliary motor 4 via a countershaft 35.
  • the circular spline 30 on the input side is connected to the main motor 3 via a flanged sleeve housing 36 and a shaft coupling 37.
  • a drive wheel 38 is flanged to the output-side circular spline 31, which meshes with a drive wheel 40 which is wedged onto the bearing journal 39 of the driven roller of the pair of pulling rollers 1.
  • the drive device shown of the pair of pulling rollers 1 via the speed-controlled main motor 3 and the speed and web voltage-controlled auxiliary motor 4 makes a mechanical connection of the pair of pulling rollers 1 with the longitudinal shaft 6 unnecessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Control Of Multiple Motors (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Description

Die Erfindung betrifft eine Einrichtung zum Antrieb von Zugwalzenpaarungen einer Rollenrotationsdruckmaschine gemäß dem Gattungsbegriff des Anspruchs 1.The invention relates to a device for driving train roller pairs of a web-fed rotary printing press according to the preamble of claim 1.

Eine Einrichtung dieser Art ist aus Siemens/Energy & Automation vol. IX, no. 4, 1987, Berlin DE Seite 22, bekannt. Bei dieser bekannten Anordnung ist der eine Eingang des Differentialgetriebes, der mit einer mit der Längswellendrehzahl korrespondierenden Drehzahl angetrieben wird, mittels eines durch eine Welle angedeuteten, mechanischen Antriebszugs antriebsmäßig mit der Längswelle verbunden. Um mit unterschiedlichen Formzylinderdurchmessern arbeiten zu können, ist der genannte mechanische Antriebszug mit einem Stufengetriebe versehen. Dieses muß bei jeder Durchmesseränderung des Formzylinders verstellt werden, was einen hohen Bedienungsaufwand bedeuten kann. Nachteilig ist natürlich auch der mit einem mechanischen Antriebszug hier vorliegender Art einschließlich Stufengetriebe verbundene, bauliche Aufwand. Zudem erweisen sich Anordnungen hier vorliegender Art mit mechanischem Antriebszug zwischen Zugwalze und Längswelle als starke Lärmquelle. Hinzu kommt, daß der mechanische Antriebszug einschließlich vorgesehenem Stufengetriebe einen hohen Wartungsaufwand erforderlich macht. Ein ganz besonderer Nachteil ist jedoch in dem hohen Platzbedarf des Antriebszugs zwischen Längswelle und Zugwalze zu sehen, der die Zugänglichkeit der Druckmaschine beeinträchtigen kann. Die Erfahrung hat zudem gezeigt, daß ein derartiger Antriebszug auch nicht beliebig gestaltet werden kann, so daß die örtliche Plazierung der Zugwalzen nicht frei gewählt werden kann, sondern starken, durch den Antriebszug vorgegebenen Einschränkungen unterliegt.A device of this kind is from Siemens / Energy & Automation vol. IX, no. 4, 1987, Berlin DE page 22. In this known arrangement, the one input of the differential gear, which is driven at a speed corresponding to the longitudinal shaft speed, is drivingly connected to the longitudinal shaft by means of a mechanical drive train indicated by a shaft. In order to be able to work with different forme cylinder diameters, the mechanical drive train mentioned is provided with a step gear. This must be adjusted each time the diameter of the forme cylinder changes, which can mean a high level of operating effort. Another disadvantage is, of course, the structural outlay associated with a mechanical drive train of this type, including a step transmission. In addition, arrangements of the present type with a mechanical drive train between the drawing roller and the longitudinal shaft have proven to be a strong source of noise. In addition, the mechanical drive train, including the provided step gear, requires a high level of maintenance. A very particular disadvantage, however, can be seen in the high space requirement of the drive train between the longitudinal shaft and the drawing roller, which impair the accessibility of the printing press can. Experience has also shown that such a drive train cannot be designed arbitrarily, so that the location of the pull rollers cannot be freely chosen, but is subject to strong restrictions imposed by the drive train.

In der genannten Entgegenhaltung ist zwar auch davon die Rede, daß in manchen Maschinen die am Falzapparat vorgesehenen Zugwalzen nicht mechanisch mit der Längswelle verbunden sind, sondern direkt mittels eines DC-Motors angetrieben werden. In diesem Zusammenhang ist allerdings nur von einer Anpassung der Geschwindigkeit an unterschiedliche Formzylinderdurchmesser die Rede.In the cited document it is also mentioned that in some machines the pulling rollers provided on the folder are not mechanically connected to the longitudinal shaft, but are driven directly by means of a DC motor. In this context, however, we are only talking about adapting the speed to different forme cylinder diameters.

Die FR-A 2 460 425 zeigt eine Antriebseinrichtung für eine ab- bzw. aufwickelbare Bahn mit zwei Zugeinrichtungen, die jeweils ein Differentialgetriebe mit einem mit dem anzutreibenden Element verbundenen Ausgang und zwei Eingängen aufweisen, von denen einer mit einem Hauptmotor zur Bewerkstelligung des Antriebs und einer mit einem Hilfsmotor zur Regulierung der Bahnspannung verbunden ist. Die beiden Hauptmotoren sind kaskadenartig miteinander verknüpft. Hierzu dient jedoch keine Längswelle. Vielmehr stellt die bekannte Anordnung auf einen konstanten Antrieb der Hauptmotoren ab. Die Hilfsmotoren werden lediglich in Abhängigkeit von der Bahnspannung geregelt. Anordnungen dieser Art können sich jedoch als sehr träge erweisen, so daß eine hohe Gefahr von Bahnrissen besteht.FR-A 2 460 425 shows a drive device for a windable or windable web with two pulling devices, each of which has a differential gear with an output connected to the element to be driven and two inputs, one of which has a main motor for accomplishing the drive and one is connected to an auxiliary motor for regulating the web tension. The two main motors are linked together in a cascade. However, no longitudinal shaft is used for this. Rather, the known arrangement is based on a constant drive of the main motors. The auxiliary motors are only regulated depending on the web tension. Arrangements of this type can, however, prove to be very sluggish, so that there is a high risk of web breaks.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, eine Anordnung gattungsgemäßer Art mit einfachen und kostengünstigen Mitteln so zu verbessern, daß nicht nur eine einfache, wartungsarme Bauweise erreicht wird, sondern gleichzeitig auch eine gute Zugänglichkeit der Druckmaschine sowie hohe Freizügigkeit hinsichtlich der räumlichen Anordnung der Zugwalzen erreicht werden, und daß dennoch eine hohe Genauigkeit und Sicherheit gewährleistet werden.Proceeding from this, it is therefore the object of the present invention to provide an arrangement of the generic type To improve simple and inexpensive means so that not only a simple, low-maintenance design is achieved, but at the same time good accessibility to the printing press and high freedom of movement with regard to the spatial arrangement of the drawing rollers are achieved, and yet high accuracy and security are guaranteed.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Maßnahmen des Anspruchs 1 gelöst.This object is achieved by the characterizing measures of claim 1.

Mit diesen Maßnahmen werden die eingangs geschilderten Nachteile des gattungsgemäßen Standes der Technik vollständig vermieden. Dadurch, daß eine mechanische Verbindung der Zugwalzen mit der Längswelle entfällt, entfällt auch der bisher benötigte mechanische Antriebszug, was abgesehen von der Vereinfachung der Bauweise auch die Zugänglichkeit der Druckmaschine verbessert und bezüglich des Standorts der Zugwalzen völlige Unabhängigkeit von mechanischen Gegebenheiten gewährleistet. Gleichzeitig gewährleistet der Wegfall eines mechanischen Antriebszugs auch eine hohe Wartungsfreundlichkeit und Lärmreduzierung. Dadurch, daß ein in Abhängigkeit von der Drehzahl der Längswelle regelbarer Hauptmotor mit einem in Abhängigkeit von der Drehzahl der Längswelle und in Abhängigkeit vom Bahnzug regelbaren Hilfsmotor zusammenwirkt, ergibt sich zudem eine hohe Feinfühligkeit und hohe Ansprechgeschwindigkeit der Bahngeschwindigkeitsregelung und damit eine hohe Sicherheit gegen Bahnriß. Außerdem ermöglicht die erfindungsgemäße Kombination auch eine einfache Anpassung der Bahngeschwindigkeit an jeden Formzylinder, ohne daß ein Stufengetriebe benötigt wird.With these measures, the disadvantages of the generic prior art described at the outset are completely avoided. The fact that a mechanical connection of the traction rollers to the longitudinal shaft is eliminated also eliminates the mechanical drive train previously required, which apart from the simplification of the construction also improves the accessibility of the printing press and ensures complete independence from mechanical conditions with regard to the location of the traction rollers. At the same time, the elimination of a mechanical drive train also ensures a high level of maintenance friendliness and noise reduction. The fact that a main motor that can be regulated as a function of the speed of the longitudinal shaft interacts with an auxiliary motor that can be regulated as a function of the speed of the longitudinal shaft and as a function of the web train also results in a high level of sensitivity and high response speed of the web speed control and thus a high level of security against web breakage. In addition, the combination according to the invention also enables simple adaptation of the web speed to each forme cylinder without the need for a stepped gear.

Vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den Unteransprüchen angegeben.Advantageous refinements and appropriate further training of the higher-level measures are specified in the subclaims.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. Die Zeichnung zeigt ein Blockschaltbild der einer Zugwalze zugeordneten, erfindungsgemäßen Antriebseinrichtung.An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. The drawing shows a block diagram of the drive device according to the invention assigned to a pull roller.

Der Aufbau und die Funktionsweise von Rollenrotationsdruckmaschinen, wie Rollenrotationstiefdruckmaschinen, sind an sich bekannt und bedürfen daher im vorliegenden Zusammenhang keiner näheren Erläuterung mehr. Derartige Anordnungen bestehen in der Regel aus mehreren, hintereinander angeordneten Druckeinheiten sowie einem vorgeordneten Rollenträger und einem nachgeordneten Falzapparat. Im Bereich zwischen dem Rollenträger und der ersten Druckeinheit sowie zwischen der letzten Druckeinheit und dem Falzapparat sind jeweils Zugwalzenpaarungen vorgesehen, welche die zu bedruckende Papierbahn von der auf dem Rollenträger aufgenommenen Rolle abziehen und im Bereich der Druckeinheiten auf Spannung halten. Die den Druckeinheiten nachgeordnete Zugwalzenpaarung, im Bereich der eine hohe Genauigkeit hinsichtlich der Geschwindigkeit gefordert wird, liegt der Zeichnung zugrunde.The structure and mode of operation of web-fed rotary printing presses, such as web-fed rotogravure printing presses, are known per se and therefore do not require any further explanation in the present context. Such arrangements usually consist of several printing units arranged one behind the other as well as an upstream roller carrier and a downstream folding unit. In the area between the roll carrier and the first printing unit and between the last printing unit and the folder, pairs of pulling rollers are provided, which pull the paper web to be printed off the roll taken up on the roll carrier and hold tension in the area of the printing units. The drawing roller pairing downstream of the printing units, in the area where high speed accuracy is required, is the basis of the drawing.

Zur Aufnahme dieser Zugwalzenpaarung 1 ist ein durch zwei einander gegenüberliegende Seitenwände gebildeter Zugwalzenständer 2 vorgesehen, der hier in nicht näher dargestellter Weise an den Falzapparatüberbau angebaut sein kann. Die Zugwalzenpaarung 1 umfaßt jeweils eine angetriebene Walze und eine auf dieser abrollende, nicht angetriebene Walze.To accommodate this pair of pulling rollers 1, one is formed by two opposite side walls Pull roll stand 2 is provided, which can be attached to the folder superstructure here in a manner not shown. The pair of pull rollers 1 each comprises a driven roller and a non-driven roller rolling thereon.

Zum Antrieb der angetriebenen Walze der Zugwalzenpaarung 1 sind ein Hauptmotor 3 und ein demgegenüber kleinerer Hilfsmotor 4 vorgesehen. Der Hauptmotor 3 besitzt eine Leistung von etwa 25 kW,der Hilfsmotor 4 von etwa 1 kW. Der Hauptmotor 3 und der Hilfsmotor 4 sind über ein Differentialgetriebe 5 mit der angetriebenen Walze der Zugwalzenpaarung 1 verbunden. Der Hauptmotor 3 und der Hilfsmotor 4 sind als Gleichstrommotoren ausgebildet, deren Drehzahl der Drehzahl der Längswelle 6 angepaßt ist, von welcher der Antrieb der Druckeinheiten und des Falzapparats abgeleitet wird. Die Drehzahl des Hilfsmotors 4 ist zusätzlich noch vom Bahnzug, d. h. der Spannung der zu bedruckenden Papierbahn, abhängig.A main motor 3 and a smaller auxiliary motor 4 are provided for driving the driven roller of the pair of draw rollers 1. The main motor 3 has an output of about 25 kW, the auxiliary motor 4 of about 1 kW. The main motor 3 and the auxiliary motor 4 are connected to the driven roller of the pair of pulling rollers 1 via a differential gear 5. The main motor 3 and the auxiliary motor 4 are designed as DC motors, the speed of which is adapted to the speed of the longitudinal shaft 6, from which the drive of the printing units and the folder is derived. The speed of the auxiliary motor 4 is also from the train, d. H. the tension of the paper web to be printed, depending.

Die Drehzahl der Längswelle 6 wird durch einen von dieser angetriebenen Impulsgenerator 7 aufgenommen. Der Impulsgenerator 7 liefert Impulssignale, was eine digitale Regelung der Motoren 3, 4 erleichtert, deren Drehzahl-Istwerte ebenfalls durch Impulsgeneratoren aufnehmbar sind. Das Ausgangssignal des Impulsgenerators 7 bildet den Sollwert für einen dem Hauptmotor 3 zugeordneten Drehzahlregelkreis 8 und einen dem Hilfsmotor 4 zugeordneten Drehzahlregelkreis 9. Der entsprechende Drehzahl-Sollwert-Eingang des Regelkreises 8 bzw. 9 ist mit 10 bzw. 11 bezeichnet. Die Drehzahlen des Hauptmotors 3 bzw. des Hilfsmotors 4 werden ebenfalls durch einen jeweils zugeordneten Impulsgenerator 12 bzw. 13 aufgenommen, deren Ausgangssignale die Drehzahl-Istwerte für die Regelkreise 8 bzw. 9 bilden. Die entsprechenden Istwert-Eingänge der Regelkreise 8 bzw. 9 sind mit 14 bzw. 15 bezeichnet. Der dem Hauptmotor 3 zugeordnete Regelkreis 8 enthält einen Drehzahlregler 16, an dem der Drehzahl-Sollwert-Eingang 10 und der Drehzahl-Istwert-Eingang 14 liegen. Dem Drehzahlregler 16 ist ein Thyristor 17 nachgeordnet, der die Energiezufuhr zum Hauptmotor 3 beeinflußt, wie durch die Signalleitung 18 angedeutet ist. Der Thyristor 17 stellt ein digital ansteuerbares Stellglied dar. Im Falle einer Abweichung des über den Eingang 14 in den Regler 16 eingegebenen Istwerts vom über den Eingang 10 in den Regler 16 eingegebenen Sollwert wird die Stromzufuhr zum Hauptmotor 3 so verändert, daß die Abweichung verschwindet.The speed of the longitudinal shaft 6 is recorded by a pulse generator 7 driven by the latter. The pulse generator 7 supplies pulse signals, which facilitates digital control of the motors 3, 4, the actual speed values of which can also be recorded by pulse generators. The output signal of the pulse generator 7 forms the setpoint for a speed control loop 8 assigned to the main motor 3 and a speed control loop 9 assigned to the auxiliary motor 4. The corresponding speed setpoint input of the control loop 8 or 9 is designated 10 or 11. The speeds of the main motor 3 and the auxiliary motor 4 are also assigned by a respective Pulse generator 12 and 13 included, the output signals of which form the actual speed values for the control loops 8 and 9, respectively. The corresponding actual value inputs of control loops 8 and 9 are designated 14 and 15, respectively. The control circuit 8 assigned to the main motor 3 contains a speed controller 16, on which the speed setpoint input 10 and the speed actual value input 14 are located. Downstream of the speed controller 16 is a thyristor 17, which influences the energy supply to the main motor 3, as indicated by the signal line 18. The thyristor 17 is a digitally controllable actuator. In the event of a deviation of the actual value entered into the controller 16 via the input 14 from the setpoint entered via the input 10 into the controller 16, the current supply to the main motor 3 is changed so that the deviation disappears.

Der dem Hilfsmotor 4 zugeordnete Drehzahlregelkreis 9 enthält ebenfalls einen Drehzahlregler 19, dem ein Thyristor 20 nachgeordnet ist, der über die Signalleitung 21 die Stromzufuhr zum Hilfsmotor 4 beeinflußt. Der Drehzahlregler 19 des Regelkreises 9 besitzt neben den Eingängen 11 und 15 einen dritten Eingang 22, durch den der am Eingang 11 eingebbare Drehzahl-Sollwert in Abhängigkeit von der Spannung der zu bedruckenden Papierbahn variierbar ist. Der Eingang 22 des Regelkreises 9 ist dementsprechend der Ausgang eines dem Drehzahlregelkreis 9 übergeordneten Bahnzugregelkreises 23. Es ergibt sich dementsprechend eine Kaskadenregelung mit einem inneren Drehzahlregelkreis und einem äußeren, übergeordneten Bahnzugregelkreis.The speed control circuit 9 assigned to the auxiliary motor 4 also contains a speed controller 19 which is followed by a thyristor 20 which influences the current supply to the auxiliary motor 4 via the signal line 21. In addition to the inputs 11 and 15, the speed controller 19 of the control circuit 9 has a third input 22, by means of which the speed setpoint value which can be input at the input 11 can be varied depending on the tension of the paper web to be printed. The input 22 of the control loop 9 is accordingly the output of a web tension control loop 23 superordinate to the speed control loop 9. This results in a cascade control with an inner speed control loop and an outer, higher-level web tension control loop.

Der Bahnzug wird mittels einer Tänzerwalze 24 und einem dieser zugeordneten Meßglied 25 aufgenommen, dessen Ausgang am Spannungs-Istwert-Eingang 26 eines Spannungsreglers 27 liegt. Der Spannungs-Sollwert wird mittels eines einstellbaren Potentiometers 28 vorgegeben, dessen Ausgang am Spannungs-Sollwert-Eingang 29 des Spannungsreglers 27 liegt. Der Ausgang des Spannungsreglers 27 liegt am zweiten Sollwert-Eingang 22 des Drehzahlreglers 19 des untergeordneten Drehzahlregelkreises 9. Hierdurch wird, wie oben schon angedeutet wurde, eine spannungsabhängige Variation des Drehzahl-Sollwerts des untergeordneten Drehzahlregelkreises 9 bewirkt, was eine hohe Genauigkeit und eine hohe Sicherheit gegen Bahnriß etc. ergibt.The web tension is recorded by means of a dancer roller 24 and a measuring element 25 assigned to it, the output of which is at the voltage actual value input 26 of a voltage regulator 27. The voltage setpoint is specified by means of an adjustable potentiometer 28, the output of which is at the voltage setpoint input 29 of the voltage regulator 27. The output of the voltage regulator 27 is located at the second setpoint input 22 of the speed regulator 19 of the subordinate speed control circuit 9. As already indicated above, this causes a voltage-dependent variation of the speed setpoint of the subordinate speed control circuit 9, which results in high accuracy and high security against web break etc.

Das den Hauptmotor 3 und den Hilfsmotor 4 mit der angetriebenen Walze der Zugwalzenpaarung 1 verbindende Differentialgetriebe 5 ist als Harmonic-Drive-Getriebe ausgebildet. Dieses enthält in an sich bekannter Weise zwei umlaufende Circularsplines 30, 31, die durch einen sogenannten Flexspline 32 überbrückt werden, der auf einem angetriebenen, ovalen Wave-Generator 33 aufgenommen ist. Die Antriebswelle 34 des Wave-Generators 33 ist über ein Vorgelege 35 mit dem Hilfsmotor 4 antriebsmäßig verbunden. Der eingangsseitige Circularspline 30 ist über ein angeflanschtes Muffengehäuse 36 und eine Wellenkupplung 37 mit dem Hauptmotor 3 verbunden. An den ausgangsseitigen Circularspline 31 ist ein Antriebsrad 38 angeflanscht, das mit einem auf den Lagerzapfen 39 der angetriebenen Walze der Zugwalzenpaarung 1 aufgekeilten Antriebsrad 40 kämmt. Hierbei erfolgt ersichtlich eine starke Untersetzung der Drehzahl des Hilfsmotors 4, so daß dieser vergleichsweise leicht dimensioniert sein kann. Gleichzeitig ergibt sich eine sehr sanfte Änderung der Zugwalzendrehzahl in Abhängigkeit von Änderungen der Bahnspannung.The differential gear 5 connecting the main motor 3 and the auxiliary motor 4 with the driven roller of the pair of pulling rollers 1 is designed as a harmonic drive gear. This contains, in a manner known per se, two rotating circular splines 30, 31, which are bridged by a so-called flex spline 32, which is received on a driven, oval wave generator 33. The drive shaft 34 of the wave generator 33 is drivingly connected to the auxiliary motor 4 via a countershaft 35. The circular spline 30 on the input side is connected to the main motor 3 via a flanged sleeve housing 36 and a shaft coupling 37. A drive wheel 38 is flanged to the output-side circular spline 31, which meshes with a drive wheel 40 which is wedged onto the bearing journal 39 of the driven roller of the pair of pulling rollers 1. This clearly shows a strong reduction in the speed of the auxiliary motor 4, so that it can be of comparatively light dimensions. At the same time, there is a very gentle change in the speed of the drawing roller as a function of changes in the web tension.

Die dargestellte Antriebseinrichtung der Zugwalzenpaarung 1 über den drehzahlgeregelten Hauptmotor 3 und den drehzahl- und bahnspannungsgeregelten Hilfsmotor 4 macht eine mechanische Verbindung der Zugwalzenpaarung 1 mit der Längswelle 6 entbehrlich.The drive device shown of the pair of pulling rollers 1 via the speed-controlled main motor 3 and the speed and web voltage-controlled auxiliary motor 4 makes a mechanical connection of the pair of pulling rollers 1 with the longitudinal shaft 6 unnecessary.

Claims (7)

  1. A device for driving pairs (1) of draw rolls of a web feed rotary printing press provided with a longitudinal shaft (6) for driving the printing units, more particularly a gravure web feed rotary printing press, in the case of which each pair (1) of draw rolls has an associated differential transmission (5), which has an output drivingly connected with the associated pair (1) of draw rolls and two inputs able to be driven at the speed differential corresponding to the output speed, of which one is able to be driven with a speed of rotation corresponding to the speed of rotation of the longitudinal shaft (6) and the other is connected with an auxiliary motor (4), whose speed of rotation is able to be regulated in a manner dependent on the speed of rotation of the longitudinal shaft and on the tension of the web to be printed, characterized in that the input, which is able to be driven at a speed of rotation corresponding to the speed of rotation of the longitudinal shaft (6), of the differential transmission (5) is able to be driven by means of a main motor (3), which is separate from the longitudinal shaft drive and whose speed of rotation is able to be regulated in a manner dependent on the speed of rotation of the longitudinal shaft (6).
  2. The device as claimed in claim 1, characterized in that the main motor (3) and the auxiliary motor (4) are respectively in the form of a D.C. motor.
  3. The device as claimed in either of the preceding claims, characterized in that the differential transmission (5) is designed in the form of a harmonic drive, whose wave generator (33) is connected with the auxiliary motor (4), whose input circular splined member (30) is connected with the main motor (3) and whose output circular splined member (31) is connected with the driven roll of the associated pair (1) of draw rolls.
  4. The device as claimed in any one of the preceding claims, characterized in that the speed of rotation regulation means of the auxiliary motor (4) comprises a cascade with two regulation circuits (9 and 23), the regulation circuit (23) responding to the web tension being acted upon by the regulation circuit (9) responding to the speed of rotation of the longitudinal shaft (6).
  5. The device as claimed in any one of the preceding claims, characterized in that the desired and actual speed of rotation values in the form of the speeds of rotation of the longitudinal shaft (6), of the main motor (3) and of the auxiliary motor (4) are able to be sensed by a pulse generator (7, 12 or, respectively, 13) driven respectively thereby.
  6. The device as claimed in any one of the preceding claims, characterized in that the desired value of the basic web regulation circuit is able to be produced by means of a potentiometer (28) and the actual value is able to be produced by means of a dandy roll (24) responsive to the web and having a following measuring member (25).
  7. The device as claimed in any one of the preceding claims, characterized in that a respective digitally controlled thyristor (17 or, respectively, 20) is provided following the speed of rotation regulator (16 or, respectively, 19) of the speed of rotation regulation circuit (8 or, respectively, 9) associated with the main motor (3) and, respectively, auxiliary motor (4).
EP89105839A 1988-04-13 1989-04-04 Device for driving draw rolls of a web-fed printing press Expired - Lifetime EP0337241B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3812295 1988-04-13
DE3812295A DE3812295C1 (en) 1988-04-13 1988-04-13

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EP0337241A2 EP0337241A2 (en) 1989-10-18
EP0337241A3 EP0337241A3 (en) 1990-07-18
EP0337241B1 true EP0337241B1 (en) 1993-08-04

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EP89105839A Expired - Lifetime EP0337241B1 (en) 1988-04-13 1989-04-04 Device for driving draw rolls of a web-fed printing press

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EP (1) EP0337241B1 (en)
JP (1) JP2798414B2 (en)
DE (2) DE3812295C1 (en)

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Also Published As

Publication number Publication date
JPH01314170A (en) 1989-12-19
DE3812295C1 (en) 1989-07-06
US4919049A (en) 1990-04-24
EP0337241A2 (en) 1989-10-18
JP2798414B2 (en) 1998-09-17
DE58905092D1 (en) 1993-09-09
EP0337241A3 (en) 1990-07-18

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