EP0194618B1 - Blanket cylinder for web-fed offset rotary printing machines - Google Patents

Blanket cylinder for web-fed offset rotary printing machines Download PDF

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Publication number
EP0194618B1
EP0194618B1 EP86103096A EP86103096A EP0194618B1 EP 0194618 B1 EP0194618 B1 EP 0194618B1 EP 86103096 A EP86103096 A EP 86103096A EP 86103096 A EP86103096 A EP 86103096A EP 0194618 B1 EP0194618 B1 EP 0194618B1
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EP
European Patent Office
Prior art keywords
rubber blanket
prominence
cylinder
groove
blanket
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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
Application number
EP86103096A
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German (de)
French (fr)
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EP0194618A3 (en
EP0194618A2 (en
Inventor
Albert Engl
Herbert Stöckl
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Manroland AG
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MAN Roland Druckmaschinen AG
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Publication of EP0194618A2 publication Critical patent/EP0194618A2/en
Publication of EP0194618A3 publication Critical patent/EP0194618A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/18—Impression cylinders

Definitions

  • the invention relates to a blanket cylinder for web-fed rotary offset printing presses with a narrow tensioning channel that extends in the axial direction, according to the preamble of claim 1.
  • the rubber blanket cylinders migrate towards one another when entering the tensioning channel and then lose the rubber blanket contact when they roll over the tensioning channel over a certain circumferential angle range, that is to say the blanket line force becomes 0.
  • the blanket cylinders then oscillate within the circumferential angle range about their equilibrium position, that they take without a blanket contact.
  • the blanket forces are suddenly rebuilt after a certain time, when the neighboring cylinders meet again after rolling over the tensioning channels. This is the so-called "interventional thrust".
  • interventional thrust For the resulting bending dynamics of the cylinders, the point in time at which this engagement shock takes place is of great importance.
  • Fig. 1 shows schematically the pit areas of two known blanket cylinders 1, 2, which, as already mentioned, so far have flats 5 and 6 on both sides of the tensioning channels 3, 4 on one side and 7 and 8 on the other side.
  • the blanket contact between the two blanket cylinders 1 and 2 is interrupted.
  • the blanket line force approaches 0 before reaching the pits and remains at 0 for a relatively long period of time.
  • the mean blanket line force is the force which is present outside the tensioning channels during the rolling of the two blanket cylinders 1 and 2.
  • Fig. 2 shows the inventive design of the areas on both sides of the clamping channels 13, 14 of two blanket cylinders 11, 12.
  • a profile increase with a progressive increase based on the circular cylindrical jacket contour provided, as indicated at 15, 16, 17, 18.
  • Fig. 3 shows schematically enlarged Profile increase 16, 18 on the blanket cylinder 12.
  • the progressive increase in the profile increases 16, 18 can follow a mathematical function, for example an exponential function, a parabola, a hyperbola or a clothoid. It is essential that the start of the profile elevations 16, 18 is the tangent to the circular arc.
  • the end of the profile elevations 16, 18 is shown quite pointedly, in practice, however, a radius of the order of 2/10 to 3/10 mm should be observed in order to damage the rubber blanket, which is known to be in the Clamping channels 13, 14 is pinched to avoid.
  • the profile elevations 16, 18 are matched to the width of the tensioning channels 13, 14 in such a way that the rubber blanket line contact is maintained when the channels are rolled over.
  • the blanket cylinders 11, 12 cannot collapse over the tensioning channels 13, 14, as a result of which the dynamic vibration behavior was adversely affected.
  • the blanket cylinders 11, 12 are first pushed apart before the tension channels 13, 14 are reached by the profile elevations 17 and 18, that is to say the blanket line force is thereby based on the average blanket line force elevated.
  • the blanket line force does not decrease to 0 over the stretching channel area, as is the case in known devices over a long period of time. If, however, this is not possible at all speeds, the increase in the blanket line force to 0 takes place during the profile increase according to the invention only during a very short period when the cylinder pit 14 is rolled over.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Description

Die Erfindung betrifft einen Gummituchzylinder für Rollen-Rotationsoffsetdruckmaschinen mit einem schmalen, sich in Achsrichtung erstreckenden Spannkanal, gemäß dem Oberbegriff des Anspruch 1.The invention relates to a blanket cylinder for web-fed rotary offset printing presses with a narrow tensioning channel that extends in the axial direction, according to the preamble of claim 1.

Alle bisher bekannten Maßnahmen zur Reduzierung bzw. Unterdrückung von Biegeschwingungen an den Kanaleinlauf-und/oder -auslaufbereichen an Gummituchzylindern liefen darauf hinaus, die Mantelkontur des Gummituchzylinders zum Kanal hin, bezogen auf das kreiszylindrische Mantelprofil, zurückzunehmen, um einen möglichst sanften Kraftanstieg beim Wiederaufbau der Gummituchlinienkraft beim Aufeinantertreffen der beiden Gummituchzylinder nach dem Überrollen des Kanals zu erreichen (siehe beispielsweise DE-AS-1 193 516, DD-PS-101 335).All previously known measures for reducing or suppressing bending vibrations at the channel inlet and / or outlet areas on rubber blanket cylinders resulted in reducing the jacket contour of the rubber blanket cylinder towards the channel, based on the circular cylindrical jacket profile, in order to increase the force as gently as possible when rebuilding the To achieve blanket line force when the two blanket cylinders meet after rolling over the channel (see for example DE-AS-1 193 516, DD-PS-101 335).

Bei einer derartigen Abflachung der Mantelkontur wandern die Gummituchzylinder beim Einlaufen in den Spannkanal aufeinander zu und verlieren dann beim Überrollen des Spannkanals über einen bestimmten Umfangswinkelbereich den Gummituchkontakt, das heißt, die Gummituchlinienkraft wird zu 0. Die Gummituchzylinder schwingen dann innerhalb des Umfangswinkelbereiches um ihre Gleichgewichtslage, die sie ohne Gummituchkontakt einnehmen. In Abhängigkeit von der Drehzahl der Druckmaschine, die heutzutage etwa 35 000 bis 45 000 Umdrehungen pro Stunde betragen kann, erfolgt nach einer bestimmten Zeit der schlagartige Wiederaufbau der Gummituchkräfte, wenn nach dem Überrollen der Spannkanäle die benachbarten Zylinder wieder gegeneinander treffen. Dies ist der sogenannte "Eingriffsstoß". Für die sich damit einstellende Biegedynamik der Zylinder ist der Zeitpunkt, zu dem dieser Eingriffsstoß erfolgt, von großer Bedeutung. So ergibt sich die größte Biegedynamik, wenn der Eingriffsstoß genau in dein unteren Umkehrpunkt der Zylinderschwingungen auftritt. Bei Rollen-Offsetdruckmaschinen mit Zylinderdurchmessern von ca. 200 mm und der üblichen Kanalbreite von 6 bis 8 mm ergeben sich die maximalen Schwingungsausschläge gerade im häufig gefahrenen oberen Betriebs-Drehzahlbereich von etwa 40 000 bis 45 000 Umdrehungen in der Stunde. Infolge der Schwingungen der Zylinder nach dem Eingriffsstoß ergeben sich mehr oder weniger stark sichtbare unerwünschte Streifen auf den Druckprodukten.With such a flattening of the jacket contour, the rubber blanket cylinders migrate towards one another when entering the tensioning channel and then lose the rubber blanket contact when they roll over the tensioning channel over a certain circumferential angle range, that is to say the blanket line force becomes 0. The blanket cylinders then oscillate within the circumferential angle range about their equilibrium position, that they take without a blanket contact. Depending on the speed of the printing press, which can now be about 35,000 to 45,000 revolutions per hour, the blanket forces are suddenly rebuilt after a certain time, when the neighboring cylinders meet again after rolling over the tensioning channels. This is the so-called "interventional thrust". For the resulting bending dynamics of the cylinders, the point in time at which this engagement shock takes place is of great importance. This results in the greatest bending dynamics when the engagement shock occurs exactly in your lower reversal point of the cylinder vibrations. With web offset printing presses with cylinder diameters of approx. 200 mm and the usual channel width of 6 to 8 mm, the maximum vibration deflections result in the frequently used upper operating speed range of around 40,000 to 45,000 revolutions per hour. As a result of the vibrations of the cylinders after the engagement impact, undesirable stripes are more or less visible on the printed products.

Aus der DE-B-2 945 280 ist es auch bekannt, zwecks Linearisierung des Kraftanstieges beidseitig des Kanals eine Überhöhung mit einer sich daran anschließenden Rücknahme vorzusehen. Dadurch wird ein gewollter plötzlich auftretender Kraftanstieg erzeugt. Die Steigung der Kraftanstiegkurve ist jedoch niedriger und die Schwingdämpfung verbessert, gegenüber anderen bekannten Anordnungen ohne diese Ausbildung. Es hat sich gezeigt, daß für Rollenrotationsdruckmaschinen mit ihren schmalen Kanälen diese Ausbildung nicht den gewünschten Erfolg bringt.From DE-B-2 945 280 it is also known to provide an elevation with a subsequent withdrawal for linearization of the increase in force on both sides of the channel. This creates an intentional sudden increase in force. However, the slope of the force increase curve is lower and the vibration damping is improved compared to other known arrangements without this design. It has been shown that this training does not bring the desired success for web-fed rotary printing presses with their narrow channels.

Aufgabe der Erfindung ist es, die Biegedynamik der Gummituchzylinder von Rollen-Rotationsoffsetdruckmaschinen beim Überrollen der Spannkanäle zu reduzieren, um die durch Zylinderschwingungen hervorgerufenen Druckstreifen auf den Druckprodukten zu vermeiden oder zumindest in ihrer Intensität wesentlich zu mindern. Diese Aufgabe wird durch die Anwendung des kennzeichnenden Teils des Anspruchs 1 gelöst. Es zeigen:

  • Fig. 1 bekannte Konturen an den Spannkanälen von Gummituchzylindern und
  • Fig. 2 die erfindungsgemäßen Konturen an den Spannkanälen von Gummituchzylindern,
  • Fig. 3 und 4 eine vergrößerte schematische Darstellung der erfindungsgemäßen Überhöhungen an den Spannkanälen von Zylindern,
  • Fig. 5 und 6 Gummituchlinienkräfte und Schwingwege bei bekannter und der erfindungsgemäßen Kanalausbildung und
  • Fig. 7 und 8 Gummituchlinienkräfte und Schwingwege bei bekannter und der erfindungsgemäßen Kanalausbildung bei einer quasi statischen Betrachtung.
The object of the invention is to reduce the bending dynamics of the blanket cylinders of web-fed rotary offset printing machines when the tensioning channels are rolled over, in order to avoid the print strips caused by cylinder vibrations on the printed products or at least to significantly reduce their intensity. This object is achieved by the application of the characterizing part of claim 1. Show it:
  • Fig. 1 known contours on the clamping channels of blanket cylinders and
  • 2 the contours according to the invention on the tensioning channels of blanket cylinders,
  • 3 and 4 is an enlarged schematic representation of the elevations according to the invention on the clamping channels of cylinders,
  • 5 and 6 blanket line forces and vibration paths in known and the channel training according to the invention and
  • 7 and 8 blanket line forces and vibration paths in known and the channel design according to the invention in a quasi-static view.

Fig. 1 zeigt schematisch die Grubenbereiche zweier bekannter Gummituchzylinder 1, 2, die, wie bereits erwähnt wurde, bisher beiderseits der Spannkanäle 3, 4 Abflachungen 5 und 6 an der einen Seite bzw. 7 und 8 an der anderen Seite aufweisen. Wie Fig. 1 erkennen läßt, wird bei einer Abflachung der An- und Auslaufbereiche 5 bis 8 an den Spannkanälen 3,4 der Gummituchkontakt zwischen den beiden Gummituchzylindern 1 und 2 unterbrochen. Je nach Ausbildung der Abflachungen 5, 7, bzw. 6, 8 geht die Gummituchlinienkraft schon vor dem Erreichen der Gruben gegen 0 und bleibt für einen verhältnismäßig langen Zeitraum auf 0. Nach dem Überrollen der Spannkanäle 3, 4 treffen schlagartig die Gummizylinder 1, 2 wieder gegeneinander, so daß bei 9 und 10 eine Extreme Erhöhung der Gummituchlinienkraft gegenüber der mittleren Gummituchlinienkraft auftritt. Die mittlere Gummituchlinienkraft ist diejenige Kraft, die während des Abrollens der beiden Gummituchzylinder 1 und 2 außerhalb der Spannkanäle vorhanden ist.Fig. 1 shows schematically the pit areas of two known blanket cylinders 1, 2, which, as already mentioned, so far have flats 5 and 6 on both sides of the tensioning channels 3, 4 on one side and 7 and 8 on the other side. As can be seen in FIG. 1, when the inlet and outlet areas 5 to 8 are flattened at the tensioning channels 3, 4, the blanket contact between the two blanket cylinders 1 and 2 is interrupted. Depending on the design of the flats 5, 7 or 6, 8, the blanket line force approaches 0 before reaching the pits and remains at 0 for a relatively long period of time. After the tensioning channels 3, 4 have been rolled over, the rubber cylinders 1, 2 suddenly hit again against each other, so that at 9 and 10 there is an extreme increase in the blanket line force compared to the mean blanket line force. The mean blanket line force is the force which is present outside the tensioning channels during the rolling of the two blanket cylinders 1 and 2.

Fig. 2 zeigt die erfindungsgemäße Ausbildung der Bereiche beiderseits der Spannkanäle 13, 14 zweier Gummituchzylinder 11, 12. Erfindungsgemäß wird, zumindest auf einer Seite eines jeden der Zylinder 11, 12, vorzugsweise jedoch beiderseits eine Profilerhöhung mit progressivem Anstieg, bezogen auf die kreiszylindrische Mantelkontur vorgesehen, wie bei 15, 16, 17, 18 angedeutet ist.Fig. 2 shows the inventive design of the areas on both sides of the clamping channels 13, 14 of two blanket cylinders 11, 12. According to the invention, at least on one side of each of the cylinders 11, 12, but preferably on both sides, a profile increase with a progressive increase, based on the circular cylindrical jacket contour provided, as indicated at 15, 16, 17, 18.

Fig. 3 zeigt schematisch vergrößert die Profilerhöhung 16, 18 am Gummituchzylinder 12. Der progressive Anstieg der Profilerhöhungen 16, 18 kann einer mathematischen Funktion folgen, beispielsweise einer Exponentialfunktion, einer Parabel, einer Hyperbel oder einer Klothoide. Wesentlich ist es daß der Beginn der Profilerhöhungen 16, 18 die Tangente an den Kreisbogen ist. In den Figuren 3 und 4 ist das Ende der Profilerhöhungen 16, 18 ziemlich spitz dargestellt, in der Praxis sollte jedoch ein Radius in der Größenordnung von 2/10 bis 3/10 mm eingehalten werden, um eine Beschädigung des Gummituches, das bekanntlich in die Spannkanäle 13, 14 eingeklemmt wird, zu vermeiden.Fig. 3 shows schematically enlarged Profile increase 16, 18 on the blanket cylinder 12. The progressive increase in the profile increases 16, 18 can follow a mathematical function, for example an exponential function, a parabola, a hyperbola or a clothoid. It is essential that the start of the profile elevations 16, 18 is the tangent to the circular arc. In Figures 3 and 4, the end of the profile elevations 16, 18 is shown quite pointedly, in practice, however, a radius of the order of 2/10 to 3/10 mm should be observed in order to damage the rubber blanket, which is known to be in the Clamping channels 13, 14 is pinched to avoid.

Erfindungswesentlich ist es, daß die Profilüberhöhungen 16, 18 so auf die Breite der Spannkanäle 13,14 abgestimmt sind, daß beim Überrollen der Kanäle der Gummituchlinienkontakt erhalten bleibt. Dadurch können zum einen die Gummituchzylinder 11, 12 über den Spannkanälen 13, 14 nicht ineinanderfallen, wodurch das dynamische Schwingungsverhalten ungünstig beeinflußt wurde. Im Gegensatz zu den bekannten Spannkanalausbildungen wird bei der erfindungsgemäßen Profilerhöhung erreicht, daß die Gummituchzylinder 11, 12 vor dem Erreichen der Spannkanäle 13, 14 durch die Profilerhöhungen 17 und 18 zunächst auseinandergedrückt werden, das heißt, die Gummituchlinienkraft wird dadurch, bezogen auf die mittlere Gummituchlinienkraft erhöht. Anschließend erfolgt über den Spannkanalbereich ein Rückgang der Gummituchlinienkraft nicht auf 0, wie dies bei bekannten Vorrichtungen über einen langen Zeitraum der Fall ist. Falls dies jedoch nicht bei allen Drehzahlen möglich ist, so erfolgt bei der erfindungsgemäßen Profilerhöhung der Rückgang der Gummituchlinienkraft auf 0 nur während eines sehr kurzen Zeitraums beim Überrollen der Zylindergrube 14.It is essential to the invention that the profile elevations 16, 18 are matched to the width of the tensioning channels 13, 14 in such a way that the rubber blanket line contact is maintained when the channels are rolled over. As a result, on the one hand, the blanket cylinders 11, 12 cannot collapse over the tensioning channels 13, 14, as a result of which the dynamic vibration behavior was adversely affected. In contrast to the known tension channel designs, it is achieved with the profile elevation according to the invention that the blanket cylinders 11, 12 are first pushed apart before the tension channels 13, 14 are reached by the profile elevations 17 and 18, that is to say the blanket line force is thereby based on the average blanket line force elevated. Subsequently, the blanket line force does not decrease to 0 over the stretching channel area, as is the case in known devices over a long period of time. If, however, this is not possible at all speeds, the increase in the blanket line force to 0 takes place during the profile increase according to the invention only during a very short period when the cylinder pit 14 is rolled over.

Auf der Ordinate ist bei den Darstellungen gemäß Fig. 5 bis 8 jeweils die Gummituchlinienkraft in N/cm bzw. der Schwingweg in Metern und auf der Abszisse die Zeit in Sekunden aufgetragen.

  • Fig. 5 zeigt den Verlauf der Gummituchlinienkraft in Newton pro cm beim Überrollen der Zylindergrube 14 und nach dem Wiederzusammentreffen der Gummituchzylinder 11 und 12 bei einer Umdrehung von 30 000 Umdrehungen pro Stunde.
  • Fig. 5 zeigt, daß beim Erreichen der Zylindergrube 14 bei einem normalen Kanalprofil die Gummituchlinienkraft zu 0 wird und über dem ganzen Kanalbereich auf 0 bleibt. Dies ist die dünn ausgezogene Linie A. Nach dem Überrollen der Zylindergrube 14 erfolgt dabei eine Erhöhung der Gummituchzylinderkraft, wonach sie sich in Form einer gedämpften Schwingung wieder langsam verringert. Die dick ausgezogene Kurve zeigt den Verlauf der Gummituchlinienkraft bei dem erfindungsgemäßen Kanal mit der Profilerhöhung 16 bzw. 18. Diese Kurve läßt erkennen, daß kurz vor dem Erreichen der Zylindergrube 14 die Gummituchlinienkraft zunächst erhöht wird und anschließend nur für eine kurze Zeit gegen 0 geht, wonach wiederum eine Starke Erhöhung auftritt. Nach einem nochmaligen kurzen Abfall wird sich dann die Gummituchkraft nach dem Überlaufen der Grube nur noch nach einer Kurve mit sehr geringenen Amplituden ändern. Die starken Ausschläge beim Überlaufen der Grube bei der erfindungsgemäßen Profilüberhöhung sind nicht störend, da während dieser Zeit nicht gedruckt wird.
  • Fig. 6 zeigt den Schwingwegverlauf des Gummituchzylinders 12 beim Überlaufen der Grube 14 und danach beim Verlauf der Gummituchlinienkräfte gemäß Fig.5. Die dünn ausgezogene Linie zeigt wiederum einen bekannten Spannkanal und die dick ausgezogene Linie den erfindungsgemäßen Spannkanal 14 mit Profilüberhöhung. Eindeutig lassen die Kurven a, b erkennen, daß bei der erfindungsgemäßen Ausbildung das dynamische Verhalten sowohl beim Überlaufen der Grube 14 als auch nach dem Überlaufen der Grube 14 wesentlich günstiger als bei den herkömmlichen Spannkanälen ohne Profilüberhöhung ist. Die Schwingungen nach dem Überlaufen der Zylindergrube 14 bei der erfindungsgemäßen Profilüberhöhung sind nicht mehr störend, das heißt sie machen sich nicht mehr als Druckstreifen auf den Druckexemplaren bemerkbar.
  • Die Figuren 7 und 8 stellen, ähnlich wie Fig. 5 und 6, nochmal die Gummituchlinienkräfte und die Schwingwege der erfindungsgemäßen (B) und der herkömmlichen Kanalausbildung (A) bei einem quasi statischen Zustand, gegenüber der etwa einer Drehzahl von 720 pro Stunde entspricht und bei dem der Anstieg ziemlich konstant verläuft.
  • Die Schwingwege des Gummituchzylinder zeigt Figur 8. Wie die Kurve A für die bekannte Kanalausbildung zeigt, geht hier der Zylinder in eine Richtung, bleibt dann auf einem bestimmten Niveau und erreicht nach ca. 0,2 sek. wieder die alte Lage. Bei der erfindungsgemäßen Kanalausführung (Kurve B) wir der Zylinder zunächst angehoben, geht dann in die andere Richtung, wird nochmals angehoben und erreicht bereits nach 0,12 sek. seine Ausgangslage. Die gesamte Wegänderung beträgt bei der erfindungsgemäßen Kanalprofilierung nur ca. 50 % der herkömmlichen Kanalausbildung.
  • Fig. 4 zeigt die erfindungsgemäße Profilerhöhung an Profilschienen 19 und 20, die beiderseits des Spannkanals 14 am Gummituchzylinder 12 befestigt, beispielsweise aufgeklebt oder angeschraubt sind. Anstelle der Verwendung von derartigen Profilschienen 19, 20 ist es auch möglich, die Profilerhöhungen direkt aus dem Zylindervollmaterial zu arbeiten.
5 to 8, the blanket line force in N / cm or the oscillation path in meters and the time in seconds are plotted on the ordinate.
  • Fig. 5 shows the curve of the blanket line force in Newtons per cm when rolling over the cylinder pit 14 and after the rubber blanket cylinders 11 and 12 meet again at a rotation of 30,000 revolutions per hour.
  • Fig. 5 shows that when reaching the cylinder pit 14 with a normal channel profile, the blanket line force becomes 0 and remains at 0 over the entire channel area. This is the thin solid line A. After rolling over the cylinder pit 14 there is an increase in the blanket cylinder force, after which it slowly decreases again in the form of a damped oscillation. The bold curve shows the curve of the blanket line force in the channel according to the invention with the profile elevation 16 or 18. This curve shows that shortly before reaching the cylinder pit 14 the blanket line force is initially increased and then only goes towards 0 for a short time, after which a sharp increase occurs. After another brief drop, the blanket force will only change after the pit has overflowed after a curve with very low amplitudes. The strong swings when the pit is overrun in the profile elevation according to the invention are not disturbing, since no printing takes place during this time.
  • FIG. 6 shows the oscillation path of the rubber blanket cylinder 12 when the pit 14 overflows and then during the rubber blanket line forces according to FIG. 5. The thin solid line in turn shows a known tension channel and the thick solid line shows the tension channel 14 according to the invention with profile elevation. Curves a, b clearly show that, in the embodiment according to the invention, the dynamic behavior both when the pit 14 is overrun and after the pit 14 is overrun is considerably more favorable than in the conventional tensioning channels without profile elevation. The vibrations after the cylinder pit 14 overflows during the profile elevation according to the invention are no longer disturbing, that is to say they no longer make themselves felt as print strips on the printed copies.
  • FIGS. 7 and 8 represent, similar to FIGS. 5 and 6, the blanket line forces and the oscillation paths of the (B) and the conventional channel design (A) according to the invention in a quasi-static state, which corresponds to a speed of 720 per hour and where the rise is fairly constant.
  • The vibration paths of the rubber blanket cylinder are shown in FIG. 8. As curve A shows for the known channel design, the cylinder moves in one direction here, then remains at a certain level and reaches after about 0.2 seconds. the old situation again. In the case of the duct design according to the invention (curve B), the cylinder is first raised, then goes in the other direction, is raised again and already reaches after 0.12 seconds. his starting point. The total path change in the channel profiling according to the invention is only about 50% of the conventional channel design.
  • Fig. 4 shows the profile elevation according to the invention on profile rails 19 and 20, which are attached to the blanket cylinder 12 on both sides of the tensioning channel 14, for example are glued or screwed on. Instead of using profile rails 19, 20 of this type, it is also possible to work the profile elevations directly from the solid cylinder material.

Claims (4)

1. Rubber blanket cylinder for web-fed offset rotary printing machines having a narrow clamping groove extending in the axial direction (4), the run-in- and/or run-out-area of which has a contour deviating from the circular shape of the rest of the cylinder circumference, the deviation being a radial prominence (15, 17; 16,18) for affecting the force exchange behaviour at the clamping groove transition point, characterised in that the prominence increases progressively according to an exponential function (e.g. parabola, clothoid), in that the direct transition from the cylinder circumference arc to the rise of the prominence (15, 17; 16, 18) begins with the tangent on the arc and in that the amount (Y) of the prominence, based on the circular cylinder casing contour, is adapted to the width (X) of the clamping groove (14) so that when there is a run- over of the clamping grooves (13, 14) of two adjacent rubber blanket cylinders (11, 12) over the clamping grooves (13, 14) at the operational speed of the printing machine the rubber blanket line contact (Fig. 5 A) is interrupted only for a short time.
2. Rubber blanket cylinder according to claim 1, characterised in that the prominences (Fig. 4, 15, 16,17,18) are arranged on strips (19, 20) which are secured on one or both sides of the groove (14) on the rubber blanket cylinder (12).
3. Rubber blanket cylinder according to claim 1, characterised in that the prominences (15, 17; 16, 18) are arranged on both sides of the clamping grooves (13, 14) of two adjacent rubber blanket cylinders (11, 12) and have the same shape.
4. Rubber blanket cylinder according to one of the preceding claims, characterised in that with a diameter of the blanket cylinders (11, 12) of 200 mm and a groove width (X) of approximately 5 to 7 mm with a print-free zone of 12 mm over the groove area the beginning (T) of the prominence (15, 17; 16, 18) lies 3mm away from the groove wall and has an amount (Y) of prominence (15, 17; 16, 18) of 1/10 mm and the end of the prominence (18) opens into the clamping groove with a radius between 0.2 and 0.3 mm.
EP86103096A 1985-03-14 1986-03-07 Blanket cylinder for web-fed offset rotary printing machines Expired EP0194618B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3509046 1985-03-14
DE3509046 1985-03-14

Publications (3)

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EP0194618A2 EP0194618A2 (en) 1986-09-17
EP0194618A3 EP0194618A3 (en) 1987-10-14
EP0194618B1 true EP0194618B1 (en) 1989-05-10

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EP86103096A Expired EP0194618B1 (en) 1985-03-14 1986-03-07 Blanket cylinder for web-fed offset rotary printing machines

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US (1) US4738200A (en)
EP (1) EP0194618B1 (en)
JP (1) JPS61213157A (en)
DE (1) DE3663232D1 (en)

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DE10253997C1 (en) * 2002-07-19 2003-12-11 Koenig & Bauer Ag Vibration reduction method, for rotating components in rolling contact, involves using radial projection in mantle surface of one component with variable radial height and/or peripheral position
WO2004016431A1 (en) 2002-07-19 2004-02-26 Koenig & Bauer Aktiengesellschaft Method and device for reducing vibrations on rotating parts, and vibration-damped rotating part

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Also Published As

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DE3663232D1 (en) 1989-06-15
EP0194618A3 (en) 1987-10-14
US4738200A (en) 1988-04-19
JPS61213157A (en) 1986-09-22
EP0194618A2 (en) 1986-09-17

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