EP0194617B1 - Printing unit for a rotary offset printing press - Google Patents

Printing unit for a rotary offset printing press Download PDF

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Publication number
EP0194617B1
EP0194617B1 EP86103095A EP86103095A EP0194617B1 EP 0194617 B1 EP0194617 B1 EP 0194617B1 EP 86103095 A EP86103095 A EP 86103095A EP 86103095 A EP86103095 A EP 86103095A EP 0194617 B1 EP0194617 B1 EP 0194617B1
Authority
EP
European Patent Office
Prior art keywords
printing unit
blanket
printing
cylinder
printed
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
EP86103095A
Other languages
German (de)
French (fr)
Other versions
EP0194617A3 (en
EP0194617A2 (en
Inventor
Ingo Köbler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0194617A2 publication Critical patent/EP0194617A2/en
Publication of EP0194617A3 publication Critical patent/EP0194617A3/en
Application granted granted Critical
Publication of EP0194617B1 publication Critical patent/EP0194617B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F30/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41F30/04—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to transfer cylinders

Definitions

  • the invention relates to a printing unit, in particular for an offset rotary printing machine with a blanket cylinder, the diameter of which is twice as large as the diameter of the associated plate cylinder, so that two printed images can be produced and can be stretched out on the blankets using documents.
  • Such a printing unit is known from the older, unpublished EP-A-0182156. From the specialist book by Welenski, "Introduction to offset printing", Eggen-Fachbuch series, 1975, pages 283 to 303, it is further known to underlay the rubber blankets to be clamped onto a blanket cylinder so that a certain diameter is reached.
  • the plate cylinder rolls twice on the blanket cylinder during one revolution of the blanket cylinder as a result of the predetermined diameter ratios, so that two identical print images are produced on one print carrier with one revolution of the rubber blanket cylinder.
  • Fig. 1 shows a printing unit which comprises two plate cylinders 1, and two blanket cylinders 3, 4.
  • the diameters of the blanket cylinders 3, 4 correspond to twice the value of the diameters of the plate cylinders 1 and 2.
  • the plate cylinders 1, 2 can be covered with offset printing plates and the blanket cylinders 3 and 4 can be covered with blankets, for which purpose the cylinder pits, which are not described in more detail, are provided with appropriate clamping means are.
  • a print carrier 11 can be printed on both sides between the blanket cylinders 3 and 4.
  • a conventional impression cylinder can also be used instead of the second blanket cylinder 4. Both webs and sheets can be processed with such pressure values.
  • the plate cylinders 1 and 2 each rotate twice, so that two identical printed images are formed on the circumference of each blanket cylinder 3 and 4, which are transferred to the printing medium 11.
  • the two printed images A and B which should have an identical appearance from a theoretical point of view, are not the same in practice.
  • blanket pads 5, 6 are used, the thickness of which, seen in the circumferential direction, differs from conventional practice.
  • the thickness of the portion of the rubber blanket underlay 5 and 6 receiving the second printed image B changes, while the area of the underlay 5 and 6 assigned to the first printed image A is formed uniformly, that is to say has a constant diameter.
  • FIG. 2a shows the areas 7 and 8 of the base 5 separated by X for one of the blanket cylinders 3 or 4. Accordingly, the diameter of the base 5 in the first area 7, which comes to lie below the printed image A, is uniform, while it is in the second Area 8 becomes increasingly thicker seen in the circumferential direction.
  • FIG. 2a shows the most preferred embodiment of the underlay 5 according to the invention, while FIG. 2b shows a further variant in which the area 9 under the first printed image A has a uniform thickness, while the area 10 below the printed image B decreases in the circumferential direction.
  • a wedge 12 extending over the entire circumference of the double-sized blanket cylinder 3 or 4 is used on a base 11.

Landscapes

  • Printing Plates And Materials Therefor (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Pens And Brushes (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)

Description

Druckwerk für eine Offset-RotationsdruckmaschinePrinting unit for an offset rotary printing machine

Die Erfindung betrifft ein Druckwerk, insbesondere für eine Offset-Rotationsdruckmaschine mit einem Gummituchzylinder, dessen Durchmesser doppelt so groß wie der Durchmesser des zugeordneten Plattenzylinders ist, so daß zwei Druckbilder hergestellt werden können und auf den Gummitücher unter Verwendung von Unterlagen auspannbar sind.The invention relates to a printing unit, in particular for an offset rotary printing machine with a blanket cylinder, the diameter of which is twice as large as the diameter of the associated plate cylinder, so that two printed images can be produced and can be stretched out on the blankets using documents.

Ein derartiges Druckwerk ist aus der älteren nicht vorveröffentlichen EP-A-0182156 bekannt. Aus dem Fachbuch von Welenski, "Einführung in den Offsetdruck", Eggen-Fachbuchreihe, 1975, Seiten 283 bis 303 ist es des weiteren bekannt, die auf einen Gummituchzylinder aufzuspannenden Gummitücher so zu unterlegen, daß ein bestimmter Durchmesser erreicht wird. Bei der gattungsgemäßen Maschine rollt der Plattenzylinder bei einer Umdrehung des Gummituchzylinders infolge der vorgegebenen Durchmesserverhältnisse zweimal auf letzterem ab, so daß bei einer Umdrehung des Gummituchzylinders auf einem Druckträger zwei identische Druckbilder entstehen. Es wurde festgestellt, daß es u.a. infolge des zunehmend entstehenden Gummituchwulstes qualitative Unterschiede zwischen diesen beiden Druckbildern gibt, die sich beispielsweise darin zeigen können, daß die Farbintensität des einen Druckbildes sich von der Farbintensität des anderen Druckbildes unterscheidet. Mittels einer Vertiefung im Zylinder oder einer Unterbrechung im Aufzug gemäß der EP-A-0 182 156 wird deshalb dem Gummituchwulst die Möglichkeit der Entspannung gegeben. Der schlagartige Abbau des Wulstes verhindert aber nicht die während seines Aufbaues entstehenden bzw. bereits entstandenen Druckbildunterschiede oder fertigungstoleranzbedingte Qualitätsverschlechterungen, z.B. infolge Toleranzen an den Zylindern, die sich während des Maschinenlaufes bemerkbar machen. Diese können auch nicht mit den entsprechend dem Druckbild aufquellbaren Folienunterlagen gemäß der DE-B-1 201 854 verhindert werden, da hierdurch die während des Druckens auftretenden bzw. feststellbaren Druckbildunterschiede nicht kompensierbar sind. Das gleiche gilt für die spiralförmigen Gummituchzylinder gemäß der FR-A-2 157 464, deren Umfangskontur bei der Fertigung einmalig festgelegt und somit nicht veränderbar ist.Such a printing unit is known from the older, unpublished EP-A-0182156. From the specialist book by Welenski, "Introduction to offset printing", Eggen-Fachbuch series, 1975, pages 283 to 303, it is further known to underlay the rubber blankets to be clamped onto a blanket cylinder so that a certain diameter is reached. In the generic machine, the plate cylinder rolls twice on the blanket cylinder during one revolution of the blanket cylinder as a result of the predetermined diameter ratios, so that two identical print images are produced on one print carrier with one revolution of the rubber blanket cylinder. It has been found that due to the increasingly emerging rubber blanket there are qualitative differences between these two printed images, which can be shown, for example, in that the color intensity of one print image differs from the color intensity of the other print image. By means of a depression in the cylinder or an interruption in the elevator according to EP-A-0 182 156, the rubber blanket bead is therefore given the opportunity to relax. The abrupt dismantling of the bead does not, however, prevent the differences in printed images that have arisen or have arisen during its construction or deteriorations in quality caused by manufacturing tolerances, e.g. due to tolerances on the cylinders that are noticeable while the machine is running. These can also not be prevented with the film documents according to DE-B-1 201 854 which can be swelled according to the printed image, since the printed image differences occurring or ascertainable during printing cannot thereby be compensated for. The same applies to the spiral-shaped rubber blanket cylinders according to FR-A-2 157 464, the circumferential contour of which is defined once during manufacture and therefore cannot be changed.

Aufgabe der Erfindung ist est, die gattungsgemäße Maschine so zu verbessern, daß die Qualität und somit das optische Aussehen der beiden Druckbilder aneinander auf einfache und flexible Weise angeglichen werden können. Diese Aufgabe wird durch die Anwendung der Merkmale des kennzeichnenden Teils des Patentanspruchs 1 gelöst. In einfacher und individueller Weise können somit durch entsprechende Wahl der Unterlagen die beiden Druckbilder aneinander angepaßt werden. Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus dem Unteranspruch sowie aus der Beschreibung in Verbindung mit den Zeichnungen. In diesen zeigen:

  • Fig. 1 eine schematische Darstellung eines Offset-Druckwerkes und
  • Fig. 2 erfindungsgemäße Ausbildungen der Gummituchunterlagen.
The object of the invention is to improve the generic machine so that the quality and thus the optical appearance of the two printed images can be matched to one another in a simple and flexible manner. This object is achieved by applying the features of the characterizing part of patent claim 1. The two printed images can thus be adapted to one another in a simple and individual manner by appropriate selection of the documents. Advantageous developments of the invention result from the subclaim and from the description in conjunction with the drawings. In these show:
  • Fig. 1 is a schematic representation of an offset printing unit and
  • Fig. 2 training of the blanket pads according to the invention.

Fig. 1 zeigt ein Druckwerk, das zwei Plattenzylinder 1, und zwei Gummituchzylinder 3, 4 umfaßt. Die Durchmesser der Gummituchzylinder 3, 4 entsprechen dem doppelten Wert der Durchmesser der Plattenzylinder 1 und 2. In üblicher Weise sind die Plattenzylinder 1, 2 mit Offsetdruckplatten und die Gummituchzylinder 3 und 4 mit Gummitüchern bespannbar, wofür die nicht näher bezeichneten Zylindergruben mit entsprechenden Spannmitteln vorgesehen sind. Zwischen den Gummituchzylindern 3 und 4 kann ein Druckträger 11 beidseitig bedruckt werden. Selbstverständlich kann anstelle des zweiten Gummituchzylinders 4 auch ein üblicher Gegendruckzylinder eingesetzt werden. Mit derartigen Druckwerten können sowohl Bahnen als auch Bogen bearbeitet werden.Fig. 1 shows a printing unit which comprises two plate cylinders 1, and two blanket cylinders 3, 4. The diameters of the blanket cylinders 3, 4 correspond to twice the value of the diameters of the plate cylinders 1 and 2. In the usual way, the plate cylinders 1, 2 can be covered with offset printing plates and the blanket cylinders 3 and 4 can be covered with blankets, for which purpose the cylinder pits, which are not described in more detail, are provided with appropriate clamping means are. A print carrier 11 can be printed on both sides between the blanket cylinders 3 and 4. Of course, a conventional impression cylinder can also be used instead of the second blanket cylinder 4. Both webs and sheets can be processed with such pressure values.

Bei einer Umdrehung der doppelt großen Gummituchzylinder 3 und 4 drehen sich jeweils die Plattenzylinder 1 und 2 zweimal, so daß auf dem Umfang eines jeden Gummituchzylinders 3 und 4 jeweils zwei identische Druckbilder entstehen, die auf den Druckträger 11 übertragen werden. Wie eingangs bereits erwähnt wurde, gleichen sich die beiden Druckbilder A und B, die von der theoretischen Betrachtung her ein identisches Aussehen haben müßten, in der Praxis nicht.With one revolution of the double-sized blanket cylinders 3 and 4, the plate cylinders 1 and 2 each rotate twice, so that two identical printed images are formed on the circumference of each blanket cylinder 3 and 4, which are transferred to the printing medium 11. As already mentioned at the beginning, the two printed images A and B, which should have an identical appearance from a theoretical point of view, are not the same in practice.

Erfindungsgemäß werden Gummituchunterlagen 5, 6 verwendet, deren Dicke in Umfangsrichtung gesehen entgegen der herkömmlichen Praxis unterschiedlich ist. Vorzugsweise ändert sich jeweils nur die Dicke des das zweite Druckbild B aufnehmenden Abschnittes der Gummituchunterlage 5 und 6 während der dem ersten Druckbild A zugeordnete Bereich der Unterlagen 5 und 6 gleichmäßig ausgebildet ist, das heißt etwa einen konstanten Durchmesser aufweist.According to the invention, blanket pads 5, 6 are used, the thickness of which, seen in the circumferential direction, differs from conventional practice. Preferably, only the thickness of the portion of the rubber blanket underlay 5 and 6 receiving the second printed image B changes, while the area of the underlay 5 and 6 assigned to the first printed image A is formed uniformly, that is to say has a constant diameter.

Fig. 2a zeigt die durch X getrennten Bereiche 7 und 8 der Unterlage 5 für einen der Gummituchzylinder 3 oder 4. Demnach ist der Durchmeser der Unterlage 5 im ersten Bereich 7, der unterhalb des Druckbildes A zu liegen kommt, gleichmäßig, während er im zweiten Bereich 8 in Umfangsrichtung gesehen zunehmend dicker wird. Fig. 2a zeigt die bevorzugteste Ausführungsform der erfindungsgemäßen Unterlage 5, während Fig. 2b eine weitere Variante darstellt, bei der der Bereich 9 unter dem ersten Druckbild A eine gleichmäßige Dicke aufweist, während der unter dem Druckbild B liegende Bereich 10 in Umfangsrichtung abnimmt. Gemäß Fig. 2c wird ein sich über den gesamte Umfang des doppelt großen Gummituchzylinders 3 bzw. 4 erstreckender Keil 12 auf einer Unterlage 11 verwendet.2a shows the areas 7 and 8 of the base 5 separated by X for one of the blanket cylinders 3 or 4. Accordingly, the diameter of the base 5 in the first area 7, which comes to lie below the printed image A, is uniform, while it is in the second Area 8 becomes increasingly thicker seen in the circumferential direction. FIG. 2a shows the most preferred embodiment of the underlay 5 according to the invention, while FIG. 2b shows a further variant in which the area 9 under the first printed image A has a uniform thickness, while the area 10 below the printed image B decreases in the circumferential direction. According to FIG. 2c, a wedge 12 extending over the entire circumference of the double-sized blanket cylinder 3 or 4 is used on a base 11.

Durch die Verwendung der erfindungsgemäßen Unterlagen 5 und 6 läßt sich eine qualitative Verbesserung der Druckprodukte erreichen.By using the documents 5 and 6 according to the invention, a qualitative improvement of the printed products can be achieved.

Claims (2)

1. Printing unit, in particular for an offset rotary printing machine, having a rubber blanket cylinder (3, 4) whose diameter is twice as large as the diameter of the associated plate cylinder (1, 2), so that two printed images (A, B) can be produced and can be clamped on the rubber blankets using support layers (5, 6, 11), characterised in that at least the support layer (5) associated with one printed image (e.g. B) has a region (8 or 10) of a thickness which is an increasing or decreasing wedge-shape in the circumferential direction (Fig. 2a or 2b).
2. Printing unit according to claim 1, characterised in that the wedge-shaped regions (12) extend over the entire circumference of the rubber blanket cylinder (3, 4) (Fig. 2c).
EP86103095A 1985-03-14 1986-03-07 Printing unit for a rotary offset printing press Expired - Lifetime EP0194617B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3509044 1985-03-14
DE3509044 1985-03-14

Publications (3)

Publication Number Publication Date
EP0194617A2 EP0194617A2 (en) 1986-09-17
EP0194617A3 EP0194617A3 (en) 1987-10-07
EP0194617B1 true EP0194617B1 (en) 1990-08-29

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Application Number Title Priority Date Filing Date
EP86103095A Expired - Lifetime EP0194617B1 (en) 1985-03-14 1986-03-07 Printing unit for a rotary offset printing press

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EP (1) EP0194617B1 (en)
JP (1) JPS61263756A (en)
DE (1) DE3673668D1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115106863A (en) * 2022-08-25 2022-09-27 江苏盐城苏凌机械有限公司 Grinding device for metal case plane based on hardware product processing
CN117532483B (en) * 2023-12-26 2024-05-10 南通格冉泊精密模塑有限公司 Casting mold processing equipment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1201854B (en) * 1959-08-26 1965-09-30 Roland Offsetmaschf Process for finishing rubber cups in offset machines
IT966154B (en) * 1971-10-16 1974-02-11 Maschf Augsburg Nuernberg Ag IMPROVEMENT IN OFFSET PRINTING MACHINES
DE3441175C2 (en) * 1984-11-10 1987-01-22 Albert-Frankenthal Ag, 6710 Frankenthal Blanket cylinder for an offset printing machine

Also Published As

Publication number Publication date
EP0194617A3 (en) 1987-10-07
DE3673668D1 (en) 1990-10-04
EP0194617A2 (en) 1986-09-17
JPS61263756A (en) 1986-11-21

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