EP0408972B1 - Offset-printing group - Google Patents

Offset-printing group Download PDF

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Publication number
EP0408972B1
EP0408972B1 EP90112640A EP90112640A EP0408972B1 EP 0408972 B1 EP0408972 B1 EP 0408972B1 EP 90112640 A EP90112640 A EP 90112640A EP 90112640 A EP90112640 A EP 90112640A EP 0408972 B1 EP0408972 B1 EP 0408972B1
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EP
European Patent Office
Prior art keywords
cylinder
diameter
inking
plate cylinder
shaft
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Application number
EP90112640A
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German (de)
French (fr)
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EP0408972A2 (en
EP0408972A3 (en
Inventor
Thomas John
Georg Bock
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Manroland AG
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MAN Roland Druckmaschinen AG
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Publication of EP0408972A2 publication Critical patent/EP0408972A2/en
Publication of EP0408972A3 publication Critical patent/EP0408972A3/en
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Publication of EP0408972B1 publication Critical patent/EP0408972B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F31/00Inking arrangements or devices
    • B41F31/004Driving means for ink rollers

Definitions

  • the invention relates to an offset printing unit with a blanket cylinder, a plate cylinder and a resilient work surface having inking cylinder, each supported by a shaft, and driven at the same speed and roll on each other under pressure.
  • the inking cylinder has a diameter corresponding to the effective working diameter of the printing form, that is to say the plate cylinder covered with one or more plates, and rotates at the same surface speed and in the area of the contact point with the same direction of rotation.
  • the invention has for its object to provide a printing unit of the type mentioned, in which a grinding movement between the plate cylinder and the Ink application cylinder is avoided even with larger axis distance changes.
  • a blanket cylinder 1 is provided, which is mounted between side walls 3 and 4 by means of a shaft 2.
  • a plate cylinder 5 interacts with the blanket cylinder 1 and is mounted in the side walls 3, 4 by means of a shaft 6.
  • the plate cylinder 5 is supplied with ink by means of an inking cylinder 7, which is also mounted on the side walls 3, 4 by means of a shaft 8.
  • an anilox roller 10, which is mounted on the side walls 3, 4 by means of a shaft 9, is provided, which guides the ink from an ink supply device (not shown) to the inking cylinder 7.
  • the blanket cylinder 1 and the inking cylinder 7 are each mounted in eccentric bearings 11, 12 so that these parts can be placed against one another under pressure.
  • the eccentric bearings 11 and 12 are expediently designed as double eccentric bearings.
  • a drive gear 14 is placed, the pitch circle diameter equal to the pitch circle diameter one with it Intermeshing, on the while 6 mounted drive gear 15 is dimensioned.
  • the drive gear 14 is driven via two bevel gears 22, 23 by a shaft 24, which is not connected to a drive motor for the printing unit.
  • the blanket cylinder 1 is covered with a compressible blanket.
  • the diameter of this cylinder is therefore to be dimensioned such that it is slightly smaller than the pitch circle diameter of the gearwheel 14 after the rubber blanket has been placed on it - that is to say in the operational state.
  • the diameter of the plate cylinder 5 with the plate placed thereon is slightly larger than the pitch circle diameter of the drive gear 15.
  • the differences in diameter of the two ready-to-use cylinders 1 and 5 are generally of an order of magnitude which permit direct engagement of the drive gears 14, 15, the teeth of which are designed to be shifted in profile.
  • a drive gear 16 is placed, which is laterally offset from the drive gear 15 so that both gears do not mesh with each other.
  • the drive gear 16 is again of the same pitch circle diameter as the drive gears 14 and 15.
  • the intermediate gear 17 meshes with a further intermediate gear 18, the teeth of which mesh with the teeth of the drive gear 15 in the intermediate gear 17.
  • the intermediate gear 18 is in engagement with the drive gear 16 of the inking cylinder 7.
  • the inking cylinder 7 is covered with a thick, resilient pad 19, for example a rubber layer made of an incompressible material, its diameter when ready for operation must be noticeably smaller than the diameter of the plate cylinder 5 are to be carried out if the surfaces of the two cylinders are to move at the same speed at the point of contact.
  • the center distance a between the plate cylinder 5 and the inking cylinder 7 is therefore in the Operating position in which the two cylinders are placed against each other under pressure, so small that an engagement of equally large, meshing drive gears on the shafts 6 and 8 is no longer possible. Due to the offset arrangement of the drive gears 15 and 16, any center distance a can be provided.
  • the support 19 can be fixed or exchangeable on the inking cylinder 7.
  • a further drive gear 20 is firmly attached to the shaft 9. This meshes with a gear 21 which is loosely placed on the shaft 8 next to the drive gear 16 and which is still in engagement with the drive gear 15, that is to say has a smaller pitch circle diameter than the drive gear 16.
  • Other elements of the printing unit such as an ink pump, can be driven from the drive gear 20.
  • a blanket cylinder 30, a plate cylinder 31, an inking cylinder 32 and an anilox roller 33 are again provided, which are supported by means of shafts 34, 35, 36, 37 between side walls 38, 39 of the printing unit.
  • a drive gear 40 and a bevel gear 41 are fixedly mounted on the shaft 34.
  • the bevel gear 41 meshes with a further bevel gear 42 which is driven by a shaft 43 from the main drive of the printing unit.
  • a drive gear 44 meshes with the drive gear 40 and sits firmly on the shaft 35 of the plate cylinder. Both gears have the same pitch circle diameter, while the cylinders 30, 31, as in the previous exemplary embodiment, have different diameters.
  • the inking cylinder 32 is covered in this embodiment with a pad 48 made of a compressible material, for example layers of rubber, one of which contains air bubbles.
  • the diameter of the ready-to-use ink application cylinder 32 is larger than that of the ready-to-use plate cylinder 31 so that no grinding movement occurs during operation to get at the point of contact.
  • the shaft 36 of the inking cylinder 32 is fixedly connected to a drive electric motor 45. This motor is adjustable so that the inking cylinder 32 can be driven at the same speed as the cylinders 30, 31.
  • a gear 46 is loosely rotatable, which meshes on the one hand with the drive gear 44 and on the other hand with a drive gear 47 on the shaft 37 of the anilox roller 33.
  • the gear 46 has a larger pitch circle diameter than the drive gear 44 in order to bridge the center distance b, which is so large that it no longer enables a direct engagement of two intermediate gears placed on the shafts 35, 36 of the same pitch circle diameter. This in turn ensures that the drive gear chain can also easily drive the anilox roller 33 and any downstream elements of the printing unit.

Description

Die Erfindung betrifft ein Offsetdruckwerk mit einem Gummituchzylinder, einem Plattenzylinder und einem eine nachgiebige Arbeitsoberfläche aufweisenden Farbauftragzylinder, die mittels je einer Welle gelagert, und mit gleicher Drehzahl angetrieben sind sowie unter gegenseitigem Andruck aufeinander abrollen.The invention relates to an offset printing unit with a blanket cylinder, a plate cylinder and a resilient work surface having inking cylinder, each supported by a shaft, and driven at the same speed and roll on each other under pressure.

Eine derartige Anordnung ist aus der DE-PS 31 17 341 bekannt. Bei dieser Anordnung weist der Farbauftragzylinder einen dem wirksamen Arbeitsdurchmessers der Druckform, also des mit einer oder mehreren Platten belegten Plattenzylinders, entsprechenden Durchmesser auf und läuft mit gleicher Oberflächengeschwindigkeit und im Bereich der Berührungsstelle mit gleicher Drehrichtung um.Such an arrangement is known from DE-PS 31 17 341. In this arrangement, the inking cylinder has a diameter corresponding to the effective working diameter of the printing form, that is to say the plate cylinder covered with one or more plates, and rotates at the same surface speed and in the area of the contact point with the same direction of rotation.

Bedingt durch die Eindrückung der nachgiebigen Oberfläche des Farbauftragszylinders infolge des erforderlichen gegenseitigen Andrucks zwischen diesem Zylinder und dem Plattenzylinder tritt eine Schleifbewegung der Oberflächen beider Zylinder im Betrieb auf. Diese Schleifbewegung bewirkt einen höheren Plattenverschleiß, eine stärkere Erwärmung der Zylinder und Probleme mit der Feuchtmittelführung. Die Erwärmung führt zu einer Volumendehnung der Arbeitsoberfläche des Farbauftragzylinders, damit zu anderen Anstellverhältnissen zwischen den Zylindern, was die Schleifbewegung verstärkt. Durch diese Schleifbewegung wird im Spalt zwischen den beiden Zylindern mehr Feuchtmittel in die Farbe einemulgiert. Dieses Feuchtmittel steht dann nicht mehr auf der Oberfläche der Platte zum Freihalten der nicht druckenden Stellen zur Verfügung. Die Folge ist ein Tonen. Dem könnte zwar durch erhöhte Feuchtmittelführung entgegengewirkt werden. Da die meisten Farben aber nur bis zu einem bestimmten Grenzwert Feuchtmittel emulgieren können, treten bei zu hoher Feuchtmittelführung Waschmarken im Druck auf. Zudem wird bei vielen Farben durch einen zu großen Anteil emulgierten Feuchtmittels die Fließfähigkeit beeinträchtigt.Due to the indentation of the resilient surface of the inking cylinder as a result of the necessary mutual pressure between this cylinder and the plate cylinder, a grinding movement of the surfaces of both cylinders occurs during operation. This grinding movement causes higher plate wear, more heating of the cylinders and problems with the dampening solution. The heating leads to a volume expansion of the working surface of the inking cylinder, and thus to different employment relationships between the cylinders, which increases the grinding movement. This grinding movement emulsifies more dampening solution into the ink in the gap between the two cylinders. This dampening solution is then no longer available on the surface of the plate to keep the non-printing areas free. The result is a toning. This could be counteracted by increased dampening solution management. However, since most inks can only emulsify dampening solution up to a certain limit, wash marks appear in the print if the dampening solution supply is too high. In addition, the flowability of many inks is impaired by too much emulsified dampening solution.

Es ist aus der DE-PS 625 327 bzw. der US-PS 2 036 835 bekannt, daß zwischen dem Plattenzylinder und dem Gummituchzylinder einer Offsetdruckmaschine eine Schleifbewegung auftritt, wenn beide Zylinder mit gleich großen Arbeitsdurchmessern ausgeführt werden. Zur Abhilfe ist vorgesehen, daß der Durchmesser des Plattenzylinders vergrößert und der Durchmesser des Gummituchzylinders verkleinert wird. Diese Maßnahme führt bei Verwendung sogenannter inkompressibler Gummitücher zur Vermeidung der Schleifbewegung. Inkompressibel sind Gummitücher, wenn sie sich zwar verformen, nicht aber zusammendrücken, so daß beim Eindrücken durch den Plattenzylinder eine Wulstbildung auftritt.It is known from DE-PS 625 327 and US-PS 2 036 835 that a grinding movement occurs between the plate cylinder and the blanket cylinder of an offset printing machine if both cylinders are designed with the same working diameters. To remedy this, it is provided that the diameter of the plate cylinder is increased and the diameter of the blanket cylinder is reduced. This measure leads to the avoidance of the grinding movement when using so-called incompressible rubber blankets. Rubber blankets are incompressible if they deform, but do not compress, so that when the plate cylinder is pressed in, bulges occur.

Es wurde weiterhin festgestellt, daß diese Maßnahme bei Einsatz sogenannter kompressibler Gummitücher, also Gummitücher die beim Eindrücken durch den Plattenzylinder eine echte Volumenverminderung erfahren, nicht brauchbar ist. Hier führt die angegebene Durchmesserveränderung nicht zu einer Beseitigung der Schleifbewegung.It was also found that this measure cannot be used when using so-called compressible rubber blankets, ie rubber blankets which experience a real volume reduction when pressed in by the plate cylinder. Here the specified change in diameter does not remove the grinding movement.

Eine gegenläufige Änderung der Durchmesser von Plattenzylinder und Farbauftragzylinder ist nicht möglich, da der Arbeitsdurchmesser des Plattenzylinders bereits durch die Durchmesserabstimmung zwischen diesem Zylinder und dem Gummituchzylinder festliegt. Ein Antrieb des Farbauftragzylinders mit einer von der Drehzahl des Plattenzylinders abweichenden Drehzahl scheidet ebenfalls aus, da sonst ein Schablonieren auftritt. Die gesamte erforderliche Durchmesseränderung muß also am Farbauftragzylinder vorgenommen werden. Infolgedessen ändert sich der Achsabstand vom Plattenzylinder zum Farbauftragzylinder. Da aber wegen der erforderlichen 1:1 Übersetzung auf den Wellen beider Zylinder gleich große Zahnräder sitzen müssen, sind nur sehr geringe Achsabstandsänderungen durch Profilverschiebungen und Zahnkopfkürzungen realisierbar.It is not possible to change the diameter of the plate cylinder and inking cylinder in opposite directions, since the working diameter of the plate cylinder is already determined by the diameter adjustment between this cylinder and the blanket cylinder. Driving the inking cylinder at a speed different from the speed of the plate cylinder is also ruled out, otherwise stenciling will occur. The entire required change in diameter must therefore be made on the inking cylinder. As a result, the center distance changes from the plate cylinder to the inking cylinder. However, since gear wheels of the same size have to sit on the shafts of both cylinders due to the required 1: 1 ratio, only very small changes in the center distance can be achieved through profile shifts and tooth head shortenings.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein Druckwerk der eingangs genannten Gattung zu schaffen, bei dem eine Schleifbewegung zwischen dem Plattenzylinder und dem Farbauftragzylinder auch bei größeren Achsabstandsänderungen vermieden ist.Proceeding from this, the invention has for its object to provide a printing unit of the type mentioned, in which a grinding movement between the plate cylinder and the Ink application cylinder is avoided even with larger axis distance changes.

Erfindungsgemäß wird dies durch Anwendung der Maßnahmen des Kennzeichens des Anspruchs 1 oder 2 gelöst.According to the invention this is solved by applying the measures of the characterizing part of claim 1 or 2.

Auf der Zeichnung sind zwei Ausführungsbeispiele der Erfindung wiedergegeben. Es zeigt

Fig. 1
die erfindungsgemäß wesentlichen Teile eines Druckwerkes in einer Seitenansicht, teilweise aufgeschnitten,
Fig. 2
eine Ansicht der Anordnung gemäß Fig. 1 in Richtung des Pfeiles a und
Fig. 3
ein zweites Ausführungsbeispiel in einer der Fig. 1 entsprechenden Wiedergabe.
Two exemplary embodiments of the invention are shown in the drawing. It shows
Fig. 1
the essential parts of a printing unit according to the invention in a side view, partially cut away,
Fig. 2
a view of the arrangement of FIG. 1 in the direction of arrow a and
Fig. 3
a second embodiment in a representation corresponding to FIG. 1.

Beim Ausführungsbeispiel gemäß Fig. 1 ist ein Gummituchzylinder 1 vorgesehen, der mittels einer Welle 2 zwischen Seitenwänden 3 und 4 gelagert ist. Mit dem Gummituchzylinder 1 wirkt ein Plattenzylinder 5 zusammen, der mittels einer Welle 6 in den Seitenwänden 3, 4 gelagert ist. Dem Plattenzylinder 5 wird Farbe mittels eines Farbauftragzylinders 7 zugeführt, der ebenfalls mittels einer Welle 8 an den Seitenwänden 3, 4 gelagert ist. Weiterhin ist eine mittels einer Welle 9 an den Seitenwänden 3, 4 gelagerte Rasterwalze 10 vorgesehen, die die Farbe von einer nicht dargestellten Farbzuführeinrichtung zum Farbauftragzylinder 7 führt.In the embodiment shown in FIG. 1, a blanket cylinder 1 is provided, which is mounted between side walls 3 and 4 by means of a shaft 2. A plate cylinder 5 interacts with the blanket cylinder 1 and is mounted in the side walls 3, 4 by means of a shaft 6. The plate cylinder 5 is supplied with ink by means of an inking cylinder 7, which is also mounted on the side walls 3, 4 by means of a shaft 8. Furthermore, an anilox roller 10, which is mounted on the side walls 3, 4 by means of a shaft 9, is provided, which guides the ink from an ink supply device (not shown) to the inking cylinder 7.

Der Gummituchzylinder 1 und der Farbauftragzylinder 7 sind jeweils in Exzenterlagern 11, 12 gelagert, so daß diese Teile unter Druck gegeneinander angestellt werden können. Zweckmäßig sind die Exzenterlager 11 und 12 als Doppelexzenterlager ausgeführt.The blanket cylinder 1 and the inking cylinder 7 are each mounted in eccentric bearings 11, 12 so that these parts can be placed against one another under pressure. The eccentric bearings 11 and 12 are expediently designed as double eccentric bearings.

Auf die Welle 2 ist ein Antriebszahnrad 14 aufgesetzt, dessen Teilkreisdurchmesser gleich dem Teilkreisdurchmesser eines mit ihm kämmenden, auf die Weile 6 aufgesetzten Antriebszahnrades 15 bemessen ist. Das Antriebszahnrad 14 wird über zwei Kegel-Zahnräder 22, 23 von einer einem nicht dargestellten Antriebsmotor für das Druckwerk in Verbindung stehenden Welle 24 angetrieben. Beim Ausführungsbeispiel wird davon ausgegangen, daß der Gummituchzylinder 1 mit einem kompressiblen Gummituch belegt wird. Der Durchmesser dieses Zylinders ist daher so zu bemessen, daß er nach Auflage des Gummituchs - also in betriebsbereitem Zustand - geringfügig kleiner als der Teilkreisdurchmesser des Zahnrades 14 ist. Gleichzeitig ist der Durchmesser des Plattenzylinders 5 mit aufgelegter Platte geringfügig größer als der Teilkreisdurchmesser des Antriebszahnrades 15 ausgeführt. Die Durchmesserdifferenzen der beiden betriebsbereiten Zylinder 1 und 5 liegen in der Regel in einer Größenordnung, die einen unmittelbarem Eingriff der Antriebszahnräder 14, 15, deren Verzahnungen profilverschoben ausgeführt sind, gestatten.On the shaft 2, a drive gear 14 is placed, the pitch circle diameter equal to the pitch circle diameter one with it Intermeshing, on the while 6 mounted drive gear 15 is dimensioned. The drive gear 14 is driven via two bevel gears 22, 23 by a shaft 24, which is not connected to a drive motor for the printing unit. In the embodiment it is assumed that the blanket cylinder 1 is covered with a compressible blanket. The diameter of this cylinder is therefore to be dimensioned such that it is slightly smaller than the pitch circle diameter of the gearwheel 14 after the rubber blanket has been placed on it - that is to say in the operational state. At the same time, the diameter of the plate cylinder 5 with the plate placed thereon is slightly larger than the pitch circle diameter of the drive gear 15. The differences in diameter of the two ready-to-use cylinders 1 and 5 are generally of an order of magnitude which permit direct engagement of the drive gears 14, 15, the teeth of which are designed to be shifted in profile.

Auf die Welle 8 des Farbauftragzylinders 7 ist ein Antriebszahnrad 16 aufgesetzt, das gegenüber dem Antriebszahnrad 15 seitlich versetzt ist, so daß beide Zahnräder nicht miteinander kämmen. Das Antriebszahnrad 16 ist wiederum mit gleichem Teilkreisdurchmesser, wie die Antriebszahnräder 14 und 15 ausgeführt. Seitlich neben dem Antriebszahnrad 15 ist ein Zwischenzahnrad 17 angeordnet, das mit dem Antriebszahnrad 15 kämmt und dessen Zähne breiter als die Zähne des Antriebszahnrades 15 bemessen sind. Das Zwischenzahnrad 17 kämmt mit einem weiteren Zwischenzahnrad 18, dessen Zähne neben den Zähnen des Antriebszahnrades 15 in das Zwischenzahnrad 17 eingreifen. Das Zwischenzahnrad 18 steht in Eingriff mit dem Antriebszahnrad 16 des Farbauftragzylinders 7. Wenn der Farbauftragzylinder 7 mit einer dicken nachgiebigen Auflage 19, beispielsweise einer Gummischicht aus einem inkompressiblen Material, belegt ist, so muß sein Durchmesser in betriebsbereitem Zustand merklich kleiner als der Durchmesser des Plattenzylinders 5 ausgeführt werden, wenn an der Berührungsstelle der beiden Zylinder deren Oberflächen sich mit gleicher Geschwindigkeit bewegen sollen. Der Achsabstand a zwischen dem Plattenzylinder 5 und dem Farbauftragzylinder 7 ist daher in der Betriebsstellung, in der die beiden Zylinder unter Druck aneinander angestellt sind, so klein, daß ein Eingriff von, gleich großen, miteinander kämmenden Antriebszahnrädern auf den Wellen 6 und 8 nicht mehr möglich ist. Durch die versetzte Anordnung der Antriebszahnräder 15 und 16 kann aber jeder beliebige Achsabstand a vorgesehen werden. Die Auflage 19 kann fest oder auswechselbar auf den Farbauftragzylinder 7 aufgebracht sein.On the shaft 8 of the inking cylinder 7, a drive gear 16 is placed, which is laterally offset from the drive gear 15 so that both gears do not mesh with each other. The drive gear 16 is again of the same pitch circle diameter as the drive gears 14 and 15. To the side of the drive gear 15 there is an intermediate gear 17 which meshes with the drive gear 15 and whose teeth are wider than the teeth of the drive gear 15. The intermediate gear 17 meshes with a further intermediate gear 18, the teeth of which mesh with the teeth of the drive gear 15 in the intermediate gear 17. The intermediate gear 18 is in engagement with the drive gear 16 of the inking cylinder 7. If the inking cylinder 7 is covered with a thick, resilient pad 19, for example a rubber layer made of an incompressible material, its diameter when ready for operation must be noticeably smaller than the diameter of the plate cylinder 5 are to be carried out if the surfaces of the two cylinders are to move at the same speed at the point of contact. The center distance a between the plate cylinder 5 and the inking cylinder 7 is therefore in the Operating position in which the two cylinders are placed against each other under pressure, so small that an engagement of equally large, meshing drive gears on the shafts 6 and 8 is no longer possible. Due to the offset arrangement of the drive gears 15 and 16, any center distance a can be provided. The support 19 can be fixed or exchangeable on the inking cylinder 7.

Um auch noch die Rasterwalze 10 von der Antriebsgetriebekette des Druckwerkes antreiben zu können, ist auf die Welle 9 ein weiteres Antriebszahnrad 20 fest aufgesetzt. Dieses kämmt mit einem lose auf die Welle 8 neben dem Antriebszahnrad 16 aufgesetzten Zahnrad 21, das weiterhin in Eingriff mit dem Antriebszahnrad 15 steht, also einen kleineren Teilkreisdurchmesser als das Antriebszahnrad 16 hat. Vom Antriebszahnrad 20 aus können noch weitere Elemente des Druckwerkes, wie beispielsweise eine Farbpumpe, angetrieben werden.In order to also be able to drive the anilox roller 10 from the drive gear chain of the printing unit, a further drive gear 20 is firmly attached to the shaft 9. This meshes with a gear 21 which is loosely placed on the shaft 8 next to the drive gear 16 and which is still in engagement with the drive gear 15, that is to say has a smaller pitch circle diameter than the drive gear 16. Other elements of the printing unit, such as an ink pump, can be driven from the drive gear 20.

Beim Ausführungsbeispiel gemäß Fig. 3 sind wiederum ein Gummituchzylinder 30, ein Plattenzylinder 31, ein Farbauftragzylinder 32 und eine Rasterwalze 33 vorgesehen, die mittels Wellen 34, 35, 36, 37 zwischen Seitenwänden 38, 39 des Druckwerkes gelagert sind. Auf die Welle 34 ist fest ein Antriebszahnrad 40 und ein Kegelzahnrad 41 aufgesetzt. Das Kegelzahnrad 41 kämmt mit einem weiteren Kegelzahnrad 42, das über eine Welle 43 vom Hauptantrieb des Druckwerks angetrieben wird.In the exemplary embodiment according to FIG. 3, a blanket cylinder 30, a plate cylinder 31, an inking cylinder 32 and an anilox roller 33 are again provided, which are supported by means of shafts 34, 35, 36, 37 between side walls 38, 39 of the printing unit. A drive gear 40 and a bevel gear 41 are fixedly mounted on the shaft 34. The bevel gear 41 meshes with a further bevel gear 42 which is driven by a shaft 43 from the main drive of the printing unit.

Mit dem Antriebszahnrad 40 kämmt ein Antriebszahnrad 44, das fest auf der Welle 35 des Plattenzylinders sitzt. Beide Zahnräder haben den gleichen Teilkreisdurchmesser, während die Zylinder 30, 31, wie beim vorhergehenden Ausführungsbeispiel abweichende Durchmesser aufweisen. Der Farbauftragzylinder 32 ist bei diesem Ausführungsbeispiel mit einer Auflage 48 aus einem kompressiblen Material belegt, also beispielsweise aus Gummi schichten, von denen eine Luftbläschen enthält. Der Durchmesser des betriebsbereiten Farbauftragzylinders 32 ist größer als der des betriebsbereiten Plattenzylinders 31 zu bemessen, um im Betrieb keine Schleifbewegung an der Berührungsstelle zu bekommen. Die Welle 36 des Farbauftragzylinders 32 ist fest mit einem Antriebselektromotor 45 verbunden. Dieser Motor ist regelbar, so daß der Farbauftragzylinder 32 mit derselben Drehzahl wie die Zylinder 30, 31 angetrieben werden kann. Auf die Welle 36 ist weiterhin lose drehbar ein Zahnrad 46 aufgesetzt, das einerseits mit dem Antriebszahnrad 44 und andererseits mit einem Antriebszahnrad 47 auf der Welle 37 der Rasterwalze 33 kämmt. Das Zahnrad 46 weist dabei einen größeren Teilkreisdurchmesser als das Antriebszahnrad 44 auf, um den Achsabstand b zu überbrücken, der so groß ist, daß er einen unmittelbaren Eingriff zweier auf die Wellen 35, 36 aufgesetzter Zwischenräder gleichen Teilkreisdurchmessers nicht mehr ermöglicht. Hierdurch ist wiederum sichergestellt, daß die Antriebsgetriebekette in einfacher Weise auch die Rasterwalze 33, sowie ggf. nachgeschaltete Elemente des Druckwerkes antreiben kann.A drive gear 44 meshes with the drive gear 40 and sits firmly on the shaft 35 of the plate cylinder. Both gears have the same pitch circle diameter, while the cylinders 30, 31, as in the previous exemplary embodiment, have different diameters. The inking cylinder 32 is covered in this embodiment with a pad 48 made of a compressible material, for example layers of rubber, one of which contains air bubbles. The diameter of the ready-to-use ink application cylinder 32 is larger than that of the ready-to-use plate cylinder 31 so that no grinding movement occurs during operation to get at the point of contact. The shaft 36 of the inking cylinder 32 is fixedly connected to a drive electric motor 45. This motor is adjustable so that the inking cylinder 32 can be driven at the same speed as the cylinders 30, 31. On the shaft 36 a gear 46 is loosely rotatable, which meshes on the one hand with the drive gear 44 and on the other hand with a drive gear 47 on the shaft 37 of the anilox roller 33. The gear 46 has a larger pitch circle diameter than the drive gear 44 in order to bridge the center distance b, which is so large that it no longer enables a direct engagement of two intermediate gears placed on the shafts 35, 36 of the same pitch circle diameter. This in turn ensures that the drive gear chain can also easily drive the anilox roller 33 and any downstream elements of the printing unit.

Claims (4)

  1. An offset printing unit with a rubber blanket cylinder, a plate cylinder and an inking cylinder having a flexible working surface, which are carried by means of a respective shaft and driven at the same speed and roll off over each other under mutual contact pressure, characterised in that the diameter of the inking cylinder (7) is proportioned so as to differ from the diameter of the plate cylinder (5) in its operational state, in such a way that the surfaces of both cylinders at the contact point move at the same peripheral speed, in that a driving toothed wheel (16) of the drive gear chain (22. 23. 24) of the printing unit, placed in a fixed manner on the shaft (8) of the inking cylinder (7), is arranged in an offset manner laterally relative to a driving toothed wheel (15) placed in a fixed manner on the shaft of the plate cylinder (5), and in that the two driving toothed wheels (15, 16) are in driving connection with each other by way of two intermediate toothed wheels (17, 18).
  2. An offset printing unit with a rubber blanket cylinder, a plate cylinder and an inking cylinder having a flexible working surface, which are carried by means of a respective shaft and roll off over each other under mutual contact pressure at the same speed, characterised in that the diameter of the inking cylinder (32) is proportioned so as to differ from the diameter of the plate cylinder (31) in its operational state, in such a way that the surfaces of both cylinders at the contact point move at the same speed, and in that one of the two cylinders (31) is connected in a fixed manner to a driving toothed wheel (44) of the drive gear chain (41, 42, 43) of the printing machine, whilst the other cylinder (32) is coupled with a controllable drive electric motor (45).
  3. An offset printing unit according to claim 1 or 2, characterized in that a further toothed wheel (21, 46) is carried in a freely rotatable manner on the shaft of the inking cylinder (7, 32) which wheel engages, on the one hand, with the driving toothed wheel (15, 44) of the plate cylinder (5, 32) and, on the other hand, with a toothed wheel (20, 47) for driving a further element (10, 33) of the printing machine.
  4. An offset printing unit according to one of the preceding claims, characterized in that when using an inking cylinder (32), the flexible surface of which consists of a layer (48) which can be deformed with a change of volume, the diameter of the inking cylinder (32) in its operational state is greater than the outer diameter of the plate cylinder (31), in its operational state.
EP90112640A 1989-07-08 1990-07-03 Offset-printing group Expired - Lifetime EP0408972B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3922559A DE3922559C2 (en) 1989-07-08 1989-07-08 Offset printing unit
DE3922559 1989-07-08

Publications (3)

Publication Number Publication Date
EP0408972A2 EP0408972A2 (en) 1991-01-23
EP0408972A3 EP0408972A3 (en) 1991-07-24
EP0408972B1 true EP0408972B1 (en) 1994-03-30

Family

ID=6384617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90112640A Expired - Lifetime EP0408972B1 (en) 1989-07-08 1990-07-03 Offset-printing group

Country Status (5)

Country Link
US (1) US5009158A (en)
EP (1) EP0408972B1 (en)
JP (1) JPH0342247A (en)
CA (1) CA2020083C (en)
DE (2) DE3922559C2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8908243U1 (en) * 1989-07-06 1989-08-17 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
US5429048A (en) * 1989-10-05 1995-07-04 Gaffney; John M. Offset lithographic printing press
US6374734B1 (en) 1989-10-05 2002-04-23 Heidelberger Druckmaschinen Ag Tubular printing blanket
JPH0755556B2 (en) * 1991-11-16 1995-06-14 株式会社東京機械製作所 BB type printing machine having a split plate cylinder
US5345865A (en) * 1993-04-07 1994-09-13 Dahlgren Usa, Inc. Hickey removal system
DE19519141A1 (en) * 1995-05-30 1996-12-05 Fischer & Krecke Gmbh & Co Flexo printing machine with variable print length
DE10144563A1 (en) * 2001-09-11 2003-03-27 Heidelberger Druckmasch Ag Printing press and method for operating an inking unit
CN110962440A (en) * 2019-12-06 2020-04-07 海盐国宏印刷有限公司 Printing press with reduced blank gap
CN112339426A (en) * 2020-10-28 2021-02-09 广水市众诚机械有限公司 Ink station power system for curved surface offset press

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2036835A (en) * 1933-12-08 1936-04-07 Miehle Printing Press & Mfg Transfer method and means
US2136683A (en) * 1936-03-21 1938-11-15 Egry Register Co Printing machine
US2301379A (en) * 1941-04-16 1942-11-10 Willis G Davis Indexing or synchronizing apparatus
US2573090A (en) * 1947-06-06 1951-10-30 Beasley French & Company Ltd Pivotal frame structure for rotary printing machine elements
US3026798A (en) * 1960-03-15 1962-03-27 George O Frostad Printing apparatus
US3139826A (en) * 1961-06-19 1964-07-07 Phillips Petroleum Co Inking roller for printing machines
US3163109A (en) * 1963-01-21 1964-12-29 Faustel Inc Interchangeable gear drive means for rotary printing mechanism
US3191531A (en) * 1963-05-24 1965-06-29 Wood Newspaper Mach Corp Press drive means
FR1548329A (en) * 1967-06-23 1968-12-06
US3585932A (en) * 1968-06-07 1971-06-22 Wallace H Granger Automatic inking system for rotary newspaper printing press
US3724047A (en) * 1969-03-12 1973-04-03 Minnesota Mining & Mfg Inking sleeve
US3590735A (en) * 1969-08-26 1971-07-06 Harris Intertype Corp Ductor roll accelerating mechanism
US3587463A (en) * 1970-05-18 1971-06-28 Wallace H Granger Simplified circulating inking system for rotary newspaper printing press
US3774537A (en) * 1970-07-15 1973-11-27 Stevens Corp Rotary offset printing press with removable plate cylinder unit
US4000242A (en) * 1972-07-26 1976-12-28 Crown Zellerbach Corporation Web material treating system including an inflatable platen roller
CA1029240A (en) * 1973-08-01 1978-04-11 Harris Corporation Printing press drive system
US3910186A (en) * 1973-10-15 1975-10-07 American Bank Note Co Ink supply apparatus for intaglio printing press
US3930446A (en) * 1974-08-23 1976-01-06 Edmund W. Nulton Duplicator with web master
US4223603A (en) * 1979-01-10 1980-09-23 Didde-Glaser, Inc. Planetary inker for offset printing press
DE3117341C2 (en) * 1981-05-02 1988-07-07 Albert-Frankenthal Ag, 6710 Frankenthal Inking unit
DE3232780C2 (en) * 1981-10-31 1986-02-06 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Inking unit for offset printing machines
US4445433A (en) * 1982-04-02 1984-05-01 Menashe Navi Method and apparatus for variable density inking
US4428288A (en) * 1982-04-26 1984-01-31 Harper Corporation Of America Adjustable drive system for matching surface speeds of a transfer roll and plate roll and method thereof
JPS59204558A (en) * 1983-05-09 1984-11-19 Tokyo Kikai Seisakusho:Kk Mesh roll for planorgaphic printing

Also Published As

Publication number Publication date
CA2020083C (en) 1992-04-28
JPH0342247A (en) 1991-02-22
DE3922559A1 (en) 1991-01-17
US5009158A (en) 1991-04-23
CA2020083A1 (en) 1991-01-09
EP0408972A2 (en) 1991-01-23
DE3922559C2 (en) 1994-03-24
DE59005163D1 (en) 1994-05-05
EP0408972A3 (en) 1991-07-24

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