EP0331777B1 - Tensioning device for securing a cover to the cylinder of a rotary printing machine - Google Patents
Tensioning device for securing a cover to the cylinder of a rotary printing machine Download PDFInfo
- Publication number
- EP0331777B1 EP0331777B1 EP19880103685 EP88103685A EP0331777B1 EP 0331777 B1 EP0331777 B1 EP 0331777B1 EP 19880103685 EP19880103685 EP 19880103685 EP 88103685 A EP88103685 A EP 88103685A EP 0331777 B1 EP0331777 B1 EP 0331777B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tensioning
- cylinder
- tensioning device
- pistons
- groove
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F27/00—Devices for attaching printing elements or formes to supports
- B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
- B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
- B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
- B41F27/1237—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by translatory motion substantially perpendicular to support surface
-
- 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 tensioning device for fastening an elevator to the cylinder of a rotary printing press - preferably blanket tensioning device to the blanket cylinder of a web offset rotary printing press - according to the preamble of claim 1.
- Such a clamping device is known from US Pat. No. 2,209,127 for the attachment of printing plates to a plate cylinder.
- this tensioning device both ends of a support carrying the actual pressure plates are inserted into two recesses of the same height in a tensioning bar.
- the clamping bar is then moved in the direction of the center of the cylinder by screwing in screws which are anchored through it and anchored in the bottom of a cylinder pit.
- This device has the disadvantage that in order to achieve a uniform tension in the elevator, a uniform movement of the numerous screws distributed over the length of a pit is required. Such a uniform screwing in of the screws can be achieved either only with increased expenditure on operating personnel or with a complex device.
- the invention is based on the object of developing a generic tensioning device in such a way that it enables uniform tensioning of the elevator over the entire cylinder length with simple operation from a single point.
- a pit 2 with a rectangular cross section is machined parallel to its axis. From the bottom 3 of this pit 2, blind-hole-like bores are made at regular intervals towards the center of the cylinder, which serve as working cylinders 4 for pistons 5 which are axially movable therein.
- the working cylinders 4 are closed to the pit floor 3 by cover plates 6.
- the cover plates 6 fastened in the pit floor 3 by means of screws 7 each have a central passage bore 8.
- a piston rod 9 fastened to the piston 5 is led upwards out of the working cylinder 4.
- the free end of the guided out piston rod 9 is provided with a thread which is screwed into a blind hole thread 10 on the underside of a clamping bar 11.
- a lock nut 12 arranged on the thread of the piston rod 9 allows the distance between the piston 5 and the clamping bar 11 to be adjusted.
- the clamping bar 11 has a width in its lower part which corresponds approximately to that of the pit 2. In the upper part, the clamping bar 11 is reduced in width on both sides by two recesses 13 and 14 which are rectangular in cross section. The recesses 13 and 14 are delimited at the top by two laterally projecting shoulders 15 and 16 at the outer end of the tensioning strip 11.
- a feed channel 18 opens out at the side, the other end of which is connected to a pressure storage space 19 provided inside the blanket cylinder 1.
- the pressure storage space 19 can be filled with a pressurized fluid via a check valve 21 inserted into a side wall 20 of the blanket cylinder 1.
- the pressure storage space 19 is filled with a pressurized fluid, for example compressed air.
- a pressurized fluid for example compressed air.
- the fluid reaches the working spaces of the working cylinders 4 via the supply channels 18 above the pistons 5 17 exceeds, the pistons 5 are moved downward and the clamping bar 11 is slowly pulled down over the piston rods 9. Due to the controlled increase in pressure, the blanket 24 can be subjected to a precisely defined tension, regardless of slight length differences.
- the pressure storage space 19 is simply relieved of the storage pressure via the valve 21 or a special relief valve (not shown).
- the spring 17 ⁇ is arranged above the piston 5 in the working cylinder 4.
- the clamping bar 11 holds its compressive force in the basic position in the pit 2.
- the feed channel 18 ⁇ opens into the lower part of the working cylinder 4. Accordingly, energy is applied to the piston 5 only to extend the tensioning strip 11 for a change of the rubber blanket 24.
- the pressure storage space 19 in the interior of the cylinder is relieved of pressure.
Landscapes
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
Description
Die Erfindung betrifft eine Spannvorrichtung zur Befestigung eines Aufzuges am Zylinder einer Rotationsdruckmaschine - vorzugsweise Gummituch-Spannvorrichtung am Gummituchzylinder einer Rollenoffset-Rotationsdruckmaschine - gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a tensioning device for fastening an elevator to the cylinder of a rotary printing press - preferably blanket tensioning device to the blanket cylinder of a web offset rotary printing press - according to the preamble of claim 1.
Eine solche Spannvorrichtung ist aus der US-PS 2 209 127 für die Befestigung von Druckplatten auf einem Plattenzylinder bekannt. Bei dieser Spannvorrichtung werden beide Enden einer die eigentlichen Druckplatten tragenden Unterlage in zwei höhengleiche Ausnehmungen einer Spannleiste eingeführt. Daraufhin wird die Spannleiste durch Eindrehen von durch sie hindurchgeführten, im Boden einer Zylindergrube verankerten Schrauben in Richtung zur Zylindermitte bewegt. Bei dieser Vorrichtung ist nachteilig, daß zur Erreichung einer gleichmäßigen Spannung des Aufzuges eine gleichmäßige Bewegung der zahlreichen über die Länge einer Grube verteilten Schrauben erforderlich ist. Ein solch gleichmäßiges Eindrehen der Schrauben ist entweder nur mit einem erhöhten Aufwand an Bedienungspersonal oder mit einer aufwendigen Vorrichtung erreichbar.Such a clamping device is known from US Pat. No. 2,209,127 for the attachment of printing plates to a plate cylinder. In this tensioning device, both ends of a support carrying the actual pressure plates are inserted into two recesses of the same height in a tensioning bar. The clamping bar is then moved in the direction of the center of the cylinder by screwing in screws which are anchored through it and anchored in the bottom of a cylinder pit. This device has the disadvantage that in order to achieve a uniform tension in the elevator, a uniform movement of the numerous screws distributed over the length of a pit is required. Such a uniform screwing in of the screws can be achieved either only with increased expenditure on operating personnel or with a complex device.
Die Erfindung geht von der Aufgabe aus, eine gattungsgemäße Spannvorrichtung derart weiterzubilden, daß diese bei einfacher Bedienung von einer einzigen Stelle aus eine gleichmäßige Spannung des Aufzuges über die gesamte Zylinderlänge ermöglicht.The invention is based on the object of developing a generic tensioning device in such a way that it enables uniform tensioning of the elevator over the entire cylinder length with simple operation from a single point.
Diese Aufgabe wird durch die Anwendung der Merkmale des Kennzeichens des Patentanspruches 1 gelöst. Das Vorsehen von Arbeitszylindern und darin beweglichen Kolben, die mit der Spannleiste verbunden sind, ermöglicht durch eine gleichzeitige gleichmäßige Energiezufuhr zu diesen Arbeitszylindern, eine gleichmäßige Spannung bei einfachster Bedienung von einem einzigen Punkt aus.This object is achieved by applying the features of the characterizing part of patent claim 1. The provision of working cylinders and pistons movable therein, which are connected to the clamping bar, enables uniform tensioning with simultaneous energy supply to these working cylinders, uniform clamping with simple operation from a single point.
Ein Ausführungsbeispiel der Erfindung ist nachstehend anhand der Fig. beschrieben. Dabei zeigt
- Fig. 1
- einen Teilquerschnitt durch einen Gummituchzylinder im Bereich der Grube,
- Fig. 2
- einen Teillängsschnitt durch eine erfindungsgemäße Spannvorrichtung.
- Fig. 3
- einen Teillängsschnitt durch eine Variante einer erfindungsgemäßen Spannvorrichtung.
- Fig. 1
- a partial cross section through a blanket cylinder in the area of the pit,
- Fig. 2
- a partial longitudinal section through a tensioning device according to the invention.
- Fig. 3
- a partial longitudinal section through a variant of a clamping device according to the invention.
In die Mantelfläche eines Gummituchzylinders 1 ist parallel zu dessen Achse eine Grube 2 mit rechteckigem Querschnitt eingearbeitet. Vom Boden 3 dieser Grube 2 aus sind in gleichmäßigen Abständen sacklochartige Bohrungen in Richtung zur Zylindermitte hin eingebracht, die als Arbeitszylinder 4 für darin axial bewegliche Kolben 5 dienen. Die Arbeitszylinder 4 sind zum Grubenboden 3 hin durch Abdeckplatten 6 verschlossen. Die mittels Schrauben 7 im Grubenboden 3 befestigten Abdeckplatten 6 weisen jeweils eine zentrale Durchlaßbohrung 8 auf. Durch diese ist eine am Kolben 5 befestigte Kolbenstange 9 nach oben aus dem Arbeitszylinder 4 herausgeführt. Das freie Ende der herausgeführten Kolbenstange 9 ist mit einem Gewinde versehen, welches in ein Sacklochgewinde 10 an der Unterseite einer Spannleiste 11 eingeschraubt ist. Eine auf dem Gewinde der Kolbenstange 9 angeordnete Kontermutter 12 erlaubt eine Einstellung des Abstandes zwischen Kolben 5 und Spannleiste 11.In the outer surface of a blanket cylinder 1, a pit 2 with a rectangular cross section is machined parallel to its axis. From the bottom 3 of this pit 2, blind-hole-like bores are made at regular intervals towards the center of the cylinder, which serve as working
Die Spannleiste 11 weist in ihrem unteren Teil eine Breite auf, die der der Grube 2 in etwa entspricht. Im oberen Teil ist die Spannleiste 11 durch zwei im Querschnitt rechteckige Aussparungen 13 und 14 zu beiden Seiten in ihrer Breite vermindert. Die Aussparungen 13 und 14 werden nach oben durch zwei seitlich vorspringende Schultern 15 und 16 am äußeren Ende der Spannleiste 11 begrenzt.The
In den Arbeitszylindern 4 befinden sich unterhalb der Kolben 5 Federn 17, die die Kolben 5 in Grundstellung nach oben drücken. In den oberen Teil der Arbeitszylinder 4 mündet seitlich jeweils ein Zufuhrkanal 18 ein, der mit seinem anderen Ende an einem im Inneren des Gummituchzylinders 1 vorgesehenen Druckspeicherraum 19 angeschlossen ist.In the working
Der Druckspeicherraum 19 ist über ein in eine Seitenwand 20 des Gummituchzylinders 1 eingesetztes Rückschlagventil 21 mit einem unter Druck stehenden Fluid füllbar.The
Ausgehend von der Grundstellung, in der der Druckspeicherraum 19 druckentlastet ist und die Kolben 5 durch die Kraft der Federn 17 nach oben gedrückt sind, soll nunmehr das Zusammenwirken der Teile bei einem Spannvorgang beschrieben werden. Durch die obere Totpunktlage der Kolben 5 ist die Spannleiste 11 über die Kolbenstange 9 ebenfalls angehoben. Ihr äußeres, die Schultern 15 und 16 tragendes Ende ragt dabei soweit aus dem Gummituchzylinder 1 heraus, daß die beiden Ausnehmungen 13 und 14 bequem von der Seite her zugänglich sind. In die Ausnehmungen 13 und 14 werden die beiden verstärkten Enden 22 und 23 eines um den Gummituchzylinder 1 herumgelegten Gummituches 24 eingelegt.Starting from the basic position, in which the
Über das Rückschlagventil 21 wird der Druckspeicherraum 19 mit einem unter Druck stehenden Fluid - beispielsweise Druckluft - gefüllt. Das Fluid gelangt über die Zufuhrkanäle 18 in die oberhalb der Kolben 5 gelegenen Arbeitsräume der Arbeitszylinder 4. Wenn die Kraft, die das Produkt aus Fluiddruck und Kreisringsfläche an der Oberseite der Kolben 5 ergibt (bei Vernachlässigung des Eigengewichtes der bewegten Teile) die Druckkraft der Federn 17 übersteigt, werden die Kolben 5 nach unten bewegt und die Spannleiste 11 wird über die Kolbenstangen 9 langsam nach unten gezogen. Durch die gesteuerte Drucksteigerung kann das Gummituch 24 - unabhängig von geringfügigen Längendifferenzen - mit einer genau definierten Spannung beaufschlagt werden.Via the
Zur Entfernung des Gummituches wird einfach der Druckspeicherraum 19 über das Ventil 21 oder ein spezielles, nicht dargestelltes Entlastungsventil vom Speicherdruck entlastet.To remove the rubber blanket, the
Bei einer anderen, in Fig. 3 dargestellten Variante, ist die Feder 17ʹ oberhalb des Kolbens 5 im Arbeitszylinder 4 angeordnet. Ihre Druckkraft hält die Spannleiste 11 in Grundstellung in der Grube 2. Der Zufuhrkanal 18ʹ mündet in den unteren Teil des Arbeitszylinders 4 ein. Eine Beaufschlagung des Kolbens 5 mit Energie erfolgt dementsprechend nur zum Ausfahren der Spannleiste 11 für einen Wechsel des Gummituches 24. Während des Betriebes ist der Druckspeicherraum 19 im Zylinderinneren dagegen druckentlastet.In another variant, shown in FIG. 3, the spring 17ʹ is arranged above the
Statt Druckluft ist ebenso die Anwendung von Drucköl denkbar. Als Energie für die Betätigung der Kolben 5 käme jedoch auch die elektromagnetische Kraft einer stromdurchflossenen Spule in Frage, die beispielsweise im unteren Teil des Arbeitszylinders den Kolben umgeben könnte.Instead of compressed air, the use of compressed oil is also conceivable. However, the electromagnetic force of a current-carrying coil, which could surround the piston, for example, in the lower part of the working cylinder, could also be considered as energy for actuating the
Claims (5)
- Tensioning device for securing a cover to the cylinder of a rotary printing machine - preferably a rubber blanket tensioning device on the rubber blanket cylinder of a web offset rotary printing machine - having a groove extending axially parallel in the cylinder casing and a tensioning bar which can be moved radially inwards within this groove during the tensioning operation, the outward-facing upper part of which tensioning bar has a recess in each of the two sides at the same height for receiving the ends of the cover, and having tensioning means fastened in the base of the groove and secured to the tensioning bar, characterised in that the tensioning means consist of several working cylinders (4) arranged with uniform spacing in the groove base (3) and pistons (5) capable of moving axially within these working cylinders (4), to which pistons (5) there can be applied simultaneously, at least during the tensioning operation, an energy which can be supplied by way of the inside of the cylinder.
- Tensioning device according to claim 1, characterised in that the piston (5) can be moved during the tensioning operation against the force of a spring (17, 17') arranged in each working cylinder (4)
- Tensioning device according to claim 1 or 2, characterised in that the working cylinders (4) are formed by blind-holes which extend radially inwards from the groove base (3) and are respectively sealed at the groove base (3) by a covering plate (6) provided with a central through-bore (8).
- Tensioning device according to one of claims 1 to 3, characterised in that the pistons (5) are connected to the tensioning bar (11) by means of piston rods (9) passing through the through-bores (8).
- Tensioning device according to one of claims 1 to 4, characterised in that, as energy, a fluid under pressure is used, which fluid can be supplied to the working cylinder (4) by way of supply channels (18, 18') from a pressure reservoir (19) arranged inside the cylinder.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873707066 DE3707066A1 (en) | 1987-03-05 | 1987-03-05 | Clamping device for attaching a dressing to the cylinder of a rotary printing machine |
EP19880103685 EP0331777B1 (en) | 1988-03-09 | 1988-03-09 | Tensioning device for securing a cover to the cylinder of a rotary printing machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19880103685 EP0331777B1 (en) | 1988-03-09 | 1988-03-09 | Tensioning device for securing a cover to the cylinder of a rotary printing machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0331777A1 EP0331777A1 (en) | 1989-09-13 |
EP0331777B1 true EP0331777B1 (en) | 1991-09-04 |
Family
ID=8198788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880103685 Expired - Lifetime EP0331777B1 (en) | 1987-03-05 | 1988-03-09 | Tensioning device for securing a cover to the cylinder of a rotary printing machine |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0331777B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3934334C1 (en) * | 1989-10-14 | 1991-04-11 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg, De | |
DE4326251C2 (en) * | 1993-08-05 | 1997-08-28 | Koenig & Bauer Albert Ag | Rubber / blanket cylinder |
US5735211A (en) * | 1996-06-13 | 1998-04-07 | Mark Andy, Inc. | Clamping and tensioning device for printing plates |
US6073558A (en) * | 1998-07-20 | 2000-06-13 | Heidelberger Druckmaschinen Ag | Printing press having blanket cylinder with filler bar and blanket |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2555037A1 (en) * | 1975-12-06 | 1977-06-08 | Philips Patentverwaltung | Rotatable drum scanning unit holding recording sheet - has sheet at its edges and inserted into longitudinal slot in drum |
FR2527520A1 (en) * | 1982-05-27 | 1983-12-02 | Cuir Jean Pierre | DEVICE FOR FIXING A PLATE ON A CYLINDER |
DE3707066A1 (en) * | 1987-03-05 | 1988-09-15 | Roland Man Druckmasch | Clamping device for attaching a dressing to the cylinder of a rotary printing machine |
-
1988
- 1988-03-09 EP EP19880103685 patent/EP0331777B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0331777A1 (en) | 1989-09-13 |
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