EP0296393B1 - Damping unit for an offset printing machine - Google Patents

Damping unit for an offset printing machine Download PDF

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Publication number
EP0296393B1
EP0296393B1 EP88108848A EP88108848A EP0296393B1 EP 0296393 B1 EP0296393 B1 EP 0296393B1 EP 88108848 A EP88108848 A EP 88108848A EP 88108848 A EP88108848 A EP 88108848A EP 0296393 B1 EP0296393 B1 EP 0296393B1
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EP
European Patent Office
Prior art keywords
roller
plate cylinder
contact zone
forme
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
EP88108848A
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German (de)
French (fr)
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EP0296393A3 (en
EP0296393A2 (en
Inventor
Walter Dipl.-Ing. D'heureuse
Hans-Jürgen Kusch
Gerhard Heppenstiel
Rudi Stellberger
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Priority to AT88108848T priority Critical patent/ATE73047T1/en
Publication of EP0296393A2 publication Critical patent/EP0296393A2/en
Publication of EP0296393A3 publication Critical patent/EP0296393A3/en
Application granted granted Critical
Publication of EP0296393B1 publication Critical patent/EP0296393B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/26—Damping devices using transfer rollers

Definitions

  • the invention relates to a dampening unit for an offset printing machine with a pair of rollers, consisting of an applicator roller for applying dampening solution to a plate cylinder and a metering roller, a first contact zone formed by mutual pressing of the metering roller and the application roller along axially parallel surface lines of the roller pair in contact, with a gear mechanism for driving the pair of rollers with the circumferential speeds of the metering roller and the application roller essentially pointing downward in the region of the first contact zone and with a reservoir for dampening solution formed above the first contact zone and formed by the lateral surfaces of the pair of rollers and sealing means at its ends .
  • Such a dampening system is known from DE-OS 22 06 498.
  • the applicator roller for the dampening solution is driven via a gear wheel connected to it by a meshing gear wheel connected to the plate cylinder.
  • This type of drive harbors the risk of the formation of so-called “toothed strips” on the printed material, which can be caused by backlash.
  • the object of the present invention is to propose a generic dampening system with which a clean printed image can be achieved, which is in particular free of "toothed strips”.
  • the applicator roller is driven exclusively by friction.
  • the generally elastic coating of the application roller alleviates any vibrations resulting from the gear drive of the metering roller, so that the undesired appearance of so-called “toothed strips” is counteracted.
  • the operation of the dampening system according to the invention with the specified slip between the plate cylinder and applicator roller also has the further advantage of an extremely stable damp film on the printing plate, which does not tear off easily.
  • Another advantage of the slip mentioned is that it counteracts the oxidation of the printing plate.
  • the Dampening unit comprises a metering roller 3 and an applicator roller 4 for the dampening solution.
  • the metering roller 3 is supported by a shaft 6, which is received on both sides in the machine's fixed bearings.
  • a bearing plate 7 is arranged on each shaft journal of the shaft 6 so as to be pivotable about the latter.
  • the two bearing plates 7 are connected to one another by means of crossbeams 8.
  • the applicator roller 4 is supported with its ends in a slide shoe 9, which in turn slides on straight guide surfaces 10 incorporated into the bearing plates 7. These guide surfaces 10 are substantially parallel to the direction of a tangent to the plate cylinder 2 in the second contact zone 34.
  • the respective sliding shoe 9 is connected to a shaft 11 which is threaded at the free end and runs in the direction of the guide surfaces 10 and from the respective one Bearing plate 7 is guided.
  • a compression spring 12 supported on the bearing plate 7 acts on the respective sliding shoe 9 in the direction of “releasing the contact with the metering roller”.
  • the shaft 11 also penetrates a recess 13 in the respective bearing plate 7, in each of which an actuator for the respective sliding block 9 is provided.
  • the respective actuator is formed from a slidably arranged on the shaft 11 and against a screwed onto the thread of the shaft 11 an adjusting sleeve 18 and a rack 17 (not shown) meshing with the rack 17 and 16 coaxial with a worm gear.
  • the gearwheels (not shown) for adjusting the respective toothed rack 17 are fastened together on an adjusting shaft 19.
  • the worm wheel 16, which is in engagement with a worm 15, is also fastened on this adjusting shaft 19, so that the adjusting shaft 19 can be rotated by means of an actuating part 14 arranged on the worm 15.
  • the dampening solution In the upper gusset between the metering roller 3 and the application roller 4 is the dampening solution, which is enclosed here by suitable sealing means (not shown) on the end faces of these rollers.
  • An amount of dampening solution which can be adjusted by the mutual pressing of these rollers with the aid of the actuating part 14 is conveyed through the first contact zone 20 of these rollers over the lateral surface of the application roller 4 located under this contact zone 20 to the plate cylinder 2.
  • the dampening unit has a gear drive for driving the pair of rollers formed from the metering roller 3 and the applicator roller 4, with the circumferential speeds of the pair of rollers pointing downward in the region of the contact zone 20.
  • This gear transmission drives the metering roller 3 at an increased peripheral speed compared to the peripheral speed of the plate cylinder 2. This is done via a drive wheel 21 of the gear transmission, which meshes with a gear 22 which is arranged on the shaft 6 and is connected to the latter via a freewheel (not shown).
  • a trough 32 serves to collect dampening solution residues from the storage space 33 when the metering roller 3 and the application roller 4 are separated from one another at the first contact point 20, if necessary for cleaning purposes, by means of the actuating part 14.
  • the application roller 4 is driven in the second position shown in the drawing by friction in the first contact zone 20 and in the second contact zone 34, while driving the application roller 4 in the first position, not shown, in which the application roller 4 is lifted off the plate cylinder 2 , exclusively by friction in the first contact zone 20.
  • the dampening unit 1 in the drawing is in its second position, set against the plate cylinder 2 shown. To switch off the dampening unit, it can be pivoted counterclockwise into its first position by pivoting the bearing plates 7 about the shaft journal of the shaft 6.
  • Damping rollers of dampening systems are generally carried out with a soft surface.
  • a braking torque acts on the pair of rollers as a result of the flexing work, which is to be applied when the metering roller 3 and applicator roller 4 are pressed together.
  • Added to this are the braking torques due to bearing friction and, in the case of generic dampening units, additional braking torques which result from the friction of the sealing means at the ends of the pair of rollers.
  • these frictional moments are deliberately exploited and compensated by driving the metering roller 3 at a higher speed than the plate cylinder 2 so that the application roller 4 rotates in the second position at a peripheral speed of the order of 0.5-2 % is less than the peripheral speed of the plate cylinder 2.
  • the size of the braking torque exerted by the sealing means on the application roller 4 can be influenced within certain limits by the sealing force exerted by the sealing means.
  • the increased peripheral speed of the metering roller 3 is achieved in that the outer diameter of the metering roller 3 is made larger than the pitch circle of the gear wheel 22 driving it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Coating Apparatus (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)
  • Screen Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Motor Or Generator Frames (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Discharge By Other Means (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

In order to achieve a clear printed image which is, in particular, free from so-called "gear marks", the metering roller in a damping mechanism for an offset printing machine having a pair of rollers comprising an applicator roller and a metering roller driven is driven by a gear wheel which engages with a driving gear in a gear train, the applicator roller being driven exclusively by friction and braking moments acting on the applicator roller being compensated to such an extent by such a high circumferential speed of the metering roller relative to an associated plate cylinder that the applicator roller, in a continuous printing position of the damping mechanism, rotates with a circumferential speed which is in the order of 0.5 to 2.0% lower than the circumferential speed of the plate cylinder.

Description

Die Erfindung betrifft ein Feuchtwerk für eine Offset-Druckmaschine mit einem Walzenpaar, bestehend aus einer Auftragwalze zum Auftrag von Feuchtmittel auf einen Plattenzylinder und aus einer Dosierwalze, einer unter gegenseitiger Pressung der Dosierwalze und der Auftragwalze gebildeten ersten Kontaktzone entlang sich berührender achsparalleler Mantellinien des Walzenpaares, mit einem Zahnradgetriebe zum Antrieb des Walzenpaares mit im Bereich der ersten Kontaktzone im wesentlichen nach unten weisender Richtung der Umfangsgeschwindigkeiten der Dosierwalze und der Auftragwalze und mit einem oberhalb der ersten Kontaktzone befindlichen, von den Mantelflächen des Walzenpaares und von Abdichtmitteln an dessen Enden gebildeten Vorratsraum für Feuchtmittel.The invention relates to a dampening unit for an offset printing machine with a pair of rollers, consisting of an applicator roller for applying dampening solution to a plate cylinder and a metering roller, a first contact zone formed by mutual pressing of the metering roller and the application roller along axially parallel surface lines of the roller pair in contact, with a gear mechanism for driving the pair of rollers with the circumferential speeds of the metering roller and the application roller essentially pointing downward in the region of the first contact zone and with a reservoir for dampening solution formed above the first contact zone and formed by the lateral surfaces of the pair of rollers and sealing means at its ends .

Ein derartiges Feuchtwerk ist aus der DE-OS 22 06 498 bekannt. Hierbei ist die Auftragwalze für das Feuchtmittel über ein mit ihr verbundenes Zahnrad von einem damit kämmenden, mit dem Plattenzylinder verbundenen Zahnrad angetrieben. Diese Art des Antriebs birgt die Gefahr der Bildung sogenannter "Zahnstreifen" auf dem Druckgut, welche durch Zahnflankenspiel hervorgerufen werden können.Such a dampening system is known from DE-OS 22 06 498. Here, the applicator roller for the dampening solution is driven via a gear wheel connected to it by a meshing gear wheel connected to the plate cylinder. This type of drive harbors the risk of the formation of so-called "toothed strips" on the printed material, which can be caused by backlash.

In jüngerer Zeit wurde bei ähnlichen Feuchtwerkssystemen der drucktechnisch nachteilige Zahnradantrieb an der Auftragwalze noch immer beibehalten (siehe US-PS 4,455,938).More recently the similarly disadvantageous gear drive on the applicator roller has been retained in similar dampening systems (see US Pat. No. 4,455,938).

Die Aufgabe der vorliegenden Erfindung besteht darin, ein gattungsgemäßes Feuchtwerk vorzuschlagen, mit dem ein sauberes Druckbild erzielbar ist, das insbesondere frei von "Zahnstreifen" ist.The object of the present invention is to propose a generic dampening system with which a clean printed image can be achieved, which is in particular free of "toothed strips".

Diese Aufgabe wird gelöst mit einem Feuchtwerk gemäß dem Patentanspruch.This object is achieved with a dampening system according to the patent claim.

Bei der erfindungsgemäßen Ausgestaltung eines gattungsgemäßen Feuchtwerks wird die Auftragwalze ausschließlich durch Friktion angetrieben. Hierbei lindert die im allgemeinen elastische Beschichtung der Auftragwalze eventuelle vom Zahnradantrieb der Dosierwalze herrührende Vibrationen, so daß der drucktechnisch unerwünschten Erscheinung sogenannter "Zahnstreifen" entgegengewirkt wird.In the embodiment of a generic dampening system according to the invention, the applicator roller is driven exclusively by friction. Here, the generally elastic coating of the application roller alleviates any vibrations resulting from the gear drive of the metering roller, so that the undesired appearance of so-called "toothed strips" is counteracted.

Infolge einer, gemäß der Erfindung in der Größenordnung von 0,5 - 2% kleineren Umfangsgeschwindigkeit der Auftragwalze gegenüber dem Plattenzylinder tritt am Plattenzylinder ein Wischeffekt auf, welcher verhindert, daß sich Feststoffe aus der Druckfarbe oder aus dem Druckgut auf der Druckplatte des Plattenzylinders festsetzen, so daß auch ein von Verunreinigungen freies Druckbild erhalten wird.As a result of a circumferential speed of the applicator roller which is in the order of magnitude of 0.5-2% lower than that of the plate cylinder, a wiping effect occurs on the plate cylinder, which prevents solids from the printing ink or from the print material from adhering to the printing plate of the plate cylinder. so that a print image free of impurities is also obtained.

Der Betrieb des erfindungsgemäßen Feuchtwerks mit dem angegebenen Schlupf zwischen Plattenzylinder und Auftragwalze erbringt als weiteren Vorteil auch einen äußerst stabilen Feuchtfilm auf der Druckplatte, der nicht so leicht abreißt.The operation of the dampening system according to the invention with the specified slip between the plate cylinder and applicator roller also has the further advantage of an extremely stable damp film on the printing plate, which does not tear off easily.

Ein weiterer Vorteil ergibt sich durch diesen Schlupf insofern, als er dem Auftreten von Wasserschlieren entgegenwirkt.A further advantage results from this slip in that it counteracts the appearance of water streaks.

Ein weiterer Vorteil des genannten Schlupfes besteht darin, daß er der Oxydation der Druckplatte entgegenwirkt.Another advantage of the slip mentioned is that it counteracts the oxidation of the printing plate.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt.In the drawing, an embodiment of the invention is shown schematically.

Hierin ist das Feuchtwerk 1 in seiner zweiten an den Plattenzylinder 2 angestellten Lage dargestellt. Das Feuchtwerk umfaßt eine Dosierwalze 3 und eine Auftragwalze 4 für das Feuchtmittel. Die Dosierwalze 3 wird von einer Welle 6 getragen, die beiderseits in ortsfesten Lagerungen der Maschine aufgenommen ist. An den Stirnseiten der Dosierwalze 3 ist je eine Lagerplatte 7 auf je einem Wellenzapfen der Welle 6 um diese schwenkbar angeordnet. Die beiden Lagerplatten 7 sind mittels Traversen 8 miteinander verbunden. Die Auftragwalze 4 ist mit ihren Enden in je einem Gleitschuh 9 gelagert, der seinerseits an in die Lagerplatten 7 eingearbeiteten geradlinigen Führungsflächen 10 gleitet. Diese Führungsflächen 10 sind im wesentlichen parallel zu der Richtung einer Tangente an den Plattenzylinder 2 in der zweiten Kontaktzone 34. Der jeweilige Gleitschuh 9 ist mit einem am freien Ende mit Gewinde versehenen Schaft 11 verbunden, der in Richtung der Führungsflächen 10 verläuft und von der jeweiligen Lagerplatte 7 geführt ist. Je eine an der Lagerplatte 7 abgestützte Druckfeder 12 beaufschlagt den jeweiligen Gleitschuh 9 in Richtung "Lösen des Kontakts mit der Dosierwalze". Der Schaft 11 durchdringt weiterhin eine Aussparung 13 in der jeweiligen Lagerplatte 7, in der jeweils ein Stellantrieb für den jeweiligen Gleitschuh 9 vorgesehen ist. Der jeweilige Stellantrieb ist gebildet aus einer gleitbar auf dem Schaft 11 angeordneten und gegen eine auf das Gewinde des Schaftes 11 aufgeschraubte Stellhülse 18 angestellten Zahnstange 17 und einem (nicht dargestellten) mit der Zahnstange 17 kämmenden und mit einem Schneckenrad 16 koaxialen Zahnrad. Die (nicht dargestellten) Zahnräder zur Verstellung der jeweiligen Zahnstange 17 sind gemeinsam auf einer Stellwelle 19 befestigt. Auf dieser Stellwelle 19 ist weiterhin das mit einer Schnecke 15 in Eingriff stehende Schneckenrad 16 befestigt, so daß die Stellwelle 19 mittels eines an der Schnecke 15 angeordneten Betätigungsteils 14 verdrehbar ist.This shows the dampening unit 1 in its second position on the plate cylinder 2. The Dampening unit comprises a metering roller 3 and an applicator roller 4 for the dampening solution. The metering roller 3 is supported by a shaft 6, which is received on both sides in the machine's fixed bearings. On the end faces of the metering roller 3, a bearing plate 7 is arranged on each shaft journal of the shaft 6 so as to be pivotable about the latter. The two bearing plates 7 are connected to one another by means of crossbeams 8. The applicator roller 4 is supported with its ends in a slide shoe 9, which in turn slides on straight guide surfaces 10 incorporated into the bearing plates 7. These guide surfaces 10 are substantially parallel to the direction of a tangent to the plate cylinder 2 in the second contact zone 34. The respective sliding shoe 9 is connected to a shaft 11 which is threaded at the free end and runs in the direction of the guide surfaces 10 and from the respective one Bearing plate 7 is guided. A compression spring 12 supported on the bearing plate 7 acts on the respective sliding shoe 9 in the direction of “releasing the contact with the metering roller”. The shaft 11 also penetrates a recess 13 in the respective bearing plate 7, in each of which an actuator for the respective sliding block 9 is provided. The respective actuator is formed from a slidably arranged on the shaft 11 and against a screwed onto the thread of the shaft 11 an adjusting sleeve 18 and a rack 17 (not shown) meshing with the rack 17 and 16 coaxial with a worm gear. The gearwheels (not shown) for adjusting the respective toothed rack 17 are fastened together on an adjusting shaft 19. The worm wheel 16, which is in engagement with a worm 15, is also fastened on this adjusting shaft 19, so that the adjusting shaft 19 can be rotated by means of an actuating part 14 arranged on the worm 15.

Im oberen Zwickel zwischen der Dosierwalze 3 und der Auftragwalze 4 befindet sich das Feuchtmittel, das hierin durch geeignete, (nicht dargestellte) Abdichtmittel an den Stirnseiten dieser Walzen eingeschlossen ist. Eine durch die gegenseitige Pressung dieser Walzen mit Hilfe des Betätigungsteils 14 einstellbare Feuchtmittelmenge wird durch die erste Kontaktzone 20 dieser Walzen über die unter dieser Kontaktzone 20 befindliche Mantelfläche der Auftragwalze 4 zum Plattenzylinder 2 befördert. Hierzu besitzt das Feuchtwerk ein Zahnradgetriebe zum Antrieb des aus der Dosierwalze 3 und der Auftragwalze 4 gebildeten Walzenpaares mit im Bereich der Kontaktzone 20 nach unten weisender Richtung der Umfangsgeschwindigkeiten des Walzenpaares. Dieses Zahnradgetriebe treibt die Dosierwalze 3 mit einer gegenüber der Umfangsgeschwindigkeit des Plattenzylinders 2 erhöhten Umfangsgeschwindigkeit an. Dies geschieht über ein Triebrad 21 des Zahnradgetriebes, das mit einem Zahnrad 22 kämmt, welches auf der Welle 6 angeordnet und mit dieser über einen (nicht dargestellten) Freilauf verbunden ist.In the upper gusset between the metering roller 3 and the application roller 4 is the dampening solution, which is enclosed here by suitable sealing means (not shown) on the end faces of these rollers. An amount of dampening solution which can be adjusted by the mutual pressing of these rollers with the aid of the actuating part 14 is conveyed through the first contact zone 20 of these rollers over the lateral surface of the application roller 4 located under this contact zone 20 to the plate cylinder 2. For this purpose, the dampening unit has a gear drive for driving the pair of rollers formed from the metering roller 3 and the applicator roller 4, with the circumferential speeds of the pair of rollers pointing downward in the region of the contact zone 20. This gear transmission drives the metering roller 3 at an increased peripheral speed compared to the peripheral speed of the plate cylinder 2. This is done via a drive wheel 21 of the gear transmission, which meshes with a gear 22 which is arranged on the shaft 6 and is connected to the latter via a freewheel (not shown).

Ein Trog 32 dient dazu, Feuchtmittelreste aus dem Vorratsraum 33 aufzufangen, wenn die Dosierwalze 3 und die Auftragwalze 4 an der ersten Kontaktstelle 20 gegebenenfalls zu Reinigungszwecken mittels des Betätigungsteils 14 voneinander getrennt werden.A trough 32 serves to collect dampening solution residues from the storage space 33 when the metering roller 3 and the application roller 4 are separated from one another at the first contact point 20, if necessary for cleaning purposes, by means of the actuating part 14.

Die Auftragwalze 4 wird in der in der Zeichnung dargestellten zweiten Lage durch Friktion in der ersten Kontaktzone 20 und in der zweiten Kontaktzone 34 angetrieben, während ein Antrieb der Auftragwalze 4 in der nicht dargestellten ersten Lage, in der die Auftragwalze 4 vom Plattenzylinder 2 abgehoben ist, ausschließlich durch Friktion in der ersten Kontaktzone 20 erfolgt.The application roller 4 is driven in the second position shown in the drawing by friction in the first contact zone 20 and in the second contact zone 34, while driving the application roller 4 in the first position, not shown, in which the application roller 4 is lifted off the plate cylinder 2 , exclusively by friction in the first contact zone 20.

Wie erwähnt, ist das Feuchtwerk 1 in der Zeichnung in seiner zweiten, an den Plattenzylinder 2 angestellten Lage dargestellt. Zum Abstellen des Feuchtwerks ist dieses durch Schwenkung der Lagerplatten 7 um die Wellenzapfen der Welle 6 entgegen dem Uhrzeigersinn in seine erste Lage schwenkbar.As mentioned, the dampening unit 1 in the drawing is in its second position, set against the plate cylinder 2 shown. To switch off the dampening unit, it can be pivoted counterclockwise into its first position by pivoting the bearing plates 7 about the shaft journal of the shaft 6.

Auftragwalzen von Feuchtwerken werden im allgemeinen mit einer weichen Oberfläche ausgeführt. Dadurch wirkt auf das Walzenpaar ein Bremsmoment infolge der Walkarbeit, die bei gegenseitiger Pressung von Dosierwalze 3 und Auftragwalze 4 aufzubringen ist. Hinzu kommen die Bremsmomente infolge Lagerreibung und, bei gattungsgemäßen Feuchtwerken, zusätzliche Bremsmomente, die von der Reibung der Abdichtmittel an den Enden des Walzenpaares herrühren.Damping rollers of dampening systems are generally carried out with a soft surface. As a result, a braking torque acts on the pair of rollers as a result of the flexing work, which is to be applied when the metering roller 3 and applicator roller 4 are pressed together. Added to this are the braking torques due to bearing friction and, in the case of generic dampening units, additional braking torques which result from the friction of the sealing means at the ends of the pair of rollers.

Bei der vorliegenden Erfindung werden diese Reibmomente bewußt ausgenutzt und durch den Antrieb der Dosierwalze 3 mit einer gegenüber dem Plattenzylinder 2 erhöhten Drehzahl soweit kompensiert, daß die Auftragwalze 4 in der zweiten Lage mit einer Umfangsgeschwindigkeit rotiert, die in der Größenordnung von 0,5 - 2% kleiner ist als die Umfangsgeschwindigkeit des Plattenzylinders 2.In the present invention, these frictional moments are deliberately exploited and compensated by driving the metering roller 3 at a higher speed than the plate cylinder 2 so that the application roller 4 rotates in the second position at a peripheral speed of the order of 0.5-2 % is less than the peripheral speed of the plate cylinder 2.

Die Größe des von den Abdichtmitteln auf die Auftragwalze 4 ausgeübten Bremsmomentes kann durch die von den Abdichtmitteln ausgeübte Dichtkraft in gewissen Grenzen beeinflußt werden.The size of the braking torque exerted by the sealing means on the application roller 4 can be influenced within certain limits by the sealing force exerted by the sealing means.

Bei dem in der Zeichnung dargestellten Ausführungsbeispiel wird die erhöhte Umfangsgeschwindigkeit der Dosierwalze 3 dadurch erreicht, daß der Außendurchmesser der Dosierwalze 3 gegenüber dem Teilkreis des diese antreibenden Zahnrades 22 größer ausgeführt ist.In the embodiment shown in the drawing, the increased peripheral speed of the metering roller 3 is achieved in that the outer diameter of the metering roller 3 is made larger than the pitch circle of the gear wheel 22 driving it.

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

11
FeuchtwerkDampening system
22nd
PlattenzylinderPlate cylinder
33rd
DosierwalzeDosing roller
44th
AuftragwalzeApplicator roller
66
Wellewave
77
LagerplatteBearing plate
88th
TraversenTrusses
99
GleitschuhSliding shoe
1010th
FührungsflächenGuide surfaces
1111
Schaftshaft
1212
DruckfederCompression spring
1313
AussparungRecess
1414
BetätigungsteilActuator
1515
Schneckeslug
1616
SchneckenradWorm wheel
1717th
ZahnstangeRack
1818th
StellhülseAdjusting sleeve
1919th
StellwelleControl shaft
2020th
KontaktzoneContact zone
2121
TriebradDrive wheel
2222
Zahnradgear
3232
Trogtrough
3333
VorratsraumPantry
3434
KontaktzoneContact zone

Claims (1)

  1. Dampening unit for an offset printing machine comprising a roller pair consisting of a forme roller for applying dampening medium onto a plate cylinder, and of a metering roller, said metering roller and said forme roller being in mutually pressing engagement, thus forming a first contact zone along respective outer surface lines of said rollers extending axially parallel and contacting each other, a gear drive for driving said roller pair at circumferential speeds, said circumferential speeds of said metering roller and said forme roller being substantially in a downward direction in the region of said first contact zone, and comprising a storage space for dampening medium located above said first contact zone and formed by the outer surfaces of said roller pair and by sealing means at the ends thereof,
    characterized in
    that only said metering roller (3) of said roller pair is driven by a gearwheel (22) meshing with a drive gear (21) of said gear drive (21, 22), that in said first contact zone (20) said forme roller (4) is driven, via frictional contact, in a first position in which said forme roller (4) is disengaged from said plate cylinder (2), that in said first contact zone (20) said forme roller is driven, via frictional contact, in a second position in which said frome roller (4) is engaged at said plate cylinder (2), and that said forme roller (4) is driven in a second contact zone (34) formed between said forme roller (4) and said plate cylinder (2), and that braking moments acting on said forme roller (4) are compensated for by a circumferential speed of said metering roller (3) which is increased over that of said plate cylinder (2) to such an extent that, in its second position, said forme roller (4) rotates at a circumferential speed which is lower by an order of magnitude of 0.5 to 2 percent than the circumferential speed of said plate cylinder (2).
EP88108848A 1987-06-25 1988-06-03 Damping unit for an offset printing machine Expired - Lifetime EP0296393B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88108848T ATE73047T1 (en) 1987-06-25 1988-06-03 DAMPENING UNIT FOR AN OFFSET PRINTING PRESS.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3720986 1987-06-25
DE3720986 1987-06-25
DE3813829 1988-04-23
DE3813829A DE3813829A1 (en) 1987-06-25 1988-04-23 DAMPING UNIT FOR AN OFFSET PRINTING MACHINE

Publications (3)

Publication Number Publication Date
EP0296393A2 EP0296393A2 (en) 1988-12-28
EP0296393A3 EP0296393A3 (en) 1990-02-07
EP0296393B1 true EP0296393B1 (en) 1992-03-04

Family

ID=25856935

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88108848A Expired - Lifetime EP0296393B1 (en) 1987-06-25 1988-06-03 Damping unit for an offset printing machine

Country Status (9)

Country Link
US (1) US4962705A (en)
EP (1) EP0296393B1 (en)
JP (1) JP2616965B2 (en)
AT (1) ATE73047T1 (en)
AU (2) AU597835B2 (en)
CA (1) CA1316041C (en)
DE (2) DE3813829A1 (en)
DK (1) DK329288A (en)
ES (1) ES2030461T3 (en)

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EP0345716A3 (en) * 1988-06-06 1990-12-19 Varn Products Company, Inc. Dampening apparatus for lithographic press
US6211761B1 (en) 1997-09-10 2001-04-03 Takamisawa Electric Co., Ltd. Electromagnetic relay, joining structure for hinge spring and yoke in the electromagnetic relay, and flux penetration preventing structure
DE10361055A1 (en) * 2003-12-22 2005-07-21 Eap Lachnit Gmbh Method for surface coating of regular/irregular components with flat surfaces with material application prepared for full width of outlet, but applied to surfaces only, and residue returned
CN104261082B (en) * 2014-10-23 2016-04-27 湖州科尼物流设备有限公司 Drive mechanism between a kind of adjacent conveyor roller

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US3673959A (en) * 1970-04-22 1972-07-04 North American Rockwell Dampening system for lithographic printing press
US3769909A (en) * 1971-03-10 1973-11-06 Rockwell International Corp Wet nip dampener
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DE2301879A1 (en) * 1973-01-16 1974-07-18 Maschf Augsburg Nuernberg Ag DAMPING UNIT FOR A REVERSIBLE ROTARY OFFSET PRINTING MACHINE
US4127067A (en) * 1974-02-15 1978-11-28 Dahlgren Harold P Method for inking printing plates
JPS5828743B2 (en) * 1977-09-02 1983-06-17 株式会社日立製作所 Thyristor valve for high voltage
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Publication number Publication date
JP2616965B2 (en) 1997-06-04
DK329288A (en) 1988-12-26
AU4010389A (en) 1990-04-05
DE3868709D1 (en) 1992-04-09
DK329288D0 (en) 1988-06-16
US4962705A (en) 1990-10-16
AU620905B2 (en) 1992-02-27
EP0296393A3 (en) 1990-02-07
AU1841588A (en) 1989-01-05
CA1316041C (en) 1993-04-13
ES2030461T3 (en) 1992-11-01
JPS6434737A (en) 1989-02-06
EP0296393A2 (en) 1988-12-28
DE3813829C2 (en) 1992-03-12
DE3813829A1 (en) 1989-01-05
AU597835B2 (en) 1990-06-07
ATE73047T1 (en) 1992-03-15

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