EP0883493B1 - Impression cylinder of a sheet-fed machine - Google Patents

Impression cylinder of a sheet-fed machine Download PDF

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Publication number
EP0883493B1
EP0883493B1 EP97902144A EP97902144A EP0883493B1 EP 0883493 B1 EP0883493 B1 EP 0883493B1 EP 97902144 A EP97902144 A EP 97902144A EP 97902144 A EP97902144 A EP 97902144A EP 0883493 B1 EP0883493 B1 EP 0883493B1
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EP
European Patent Office
Prior art keywords
cylinder
sheet
cover
printing
impression cylinder
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EP97902144A
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German (de)
French (fr)
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EP0883493A1 (en
Inventor
Johannes Georg Schaede
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KBA Notasys SA
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De la Rue Giori SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers

Definitions

  • the invention relates to an impression cylinder a sheet-fed printing machine that has at least one Has cylinder pit, arranged in the bow gripper are.
  • Printing cylinders of this type have long been known especially in indirect printing units such as Offset printing machines (e.g. GB patent 1138369), in direct printing units such as Intaglio printing machines as well as in Screen printing machines. In all cases they have so far known pressure cylinder separated by cylinder pits Pressure calipers, the circumferential length of the pressure calipers sheet to be printed is adjusted and the in between lying cylinder pits to accommodate the Bow grabs are required.
  • the object of the present invention is to achieve Basically, a printing cylinder of a sheetfed press like this train that with the presence of Cylinder pits related effects and disadvantages can be avoided in a simple manner during the printing process.
  • the printing cylinder is used to solve this task characterized in that the Bow gripper in its closed position the envelope the cylindrical peripheral surface of the impression cylinder do not protrude and that each cylinder pit with a adjustable cover by an adjusting mechanism is provided, which in a first position Cylinder pit with the in their closed position located grippers completely and the cylindrical circumferential surface of the impression cylinder added and which in a second position the cylinder pit at least partially releases in the area of the gripper.
  • the printing cylinder can be used train its adjusting mechanism so that a Cylinder pit is completely closed every time if the print nip during printing happens, but during the sheet transfer to and from Printing cylinder released from the cover so far is that the grippers take up their open position can and the sheet transfer in the usual way can take place.
  • a cylinder pit of the Printing cylinder opened so wide during sheet transfer, that the bow grab of the concerned Transfer cylinders, as usual, something in this Can immerse the cylinder pit.
  • the Printing cylinder when printing with a closed, practically continuous surface rolls continuously on the cylinder printing the image, at which is particularly a screen printing cylinder a screen printing machine or a blanket cylinder Offset printing machine can act.
  • the impression cylinder according to the invention can also in a Embossing printing machine can be used. Construction and Surface of the impression cylinder and its saddles are each adapted to the press type. Preferably, the hard or adequate rigid surface of the cover of that of the impression cylinder.
  • the printing cylinder 1 has in the example considered only one cylinder pit 3 and therefore only one Pressure saddle for receiving a sheet B.
  • the impression cylinder also two or more evenly Distributed cylinder pits and pressure saddles for admission of two or more sheets, all Cylinder pits are of the same design.
  • the cylinder pit is also with a adjustable cover 7, which by a Shaft 8 between a closed position ( Figure 2) and one partially releasing the cylinder pit Open position ( Figure 1) is adjustable.
  • a control lever in the form an angle lift 9, one end of which in the area of Shaft 8 is firmly connected to the cover 7 and the other end of which carries a cam roller 10 a stationary cam 11, which when rotating of the pressure cylinder 1, the cam roller 10 and thus the Angle lever 9 with the cover 7 leads, and from a the angle lever 9 with its cam roller 10 against the Scope of the cam 11 pressing spring 12, which on rotating printing cylinder 1 is attached.
  • the control curve 11 has one to the axis of the Printing cylinder 1 concentric peripheral region 11a and two outwardly projecting peripheral areas, the each in the areas of the bow transfer to Printing cylinder and sheet transfer from the printing cylinder are located and of which in the figures only after outside curved peripheral area 11b in the area of Arch acceptance can be seen.
  • the arrangement is like this hit that the cover 7 the cylinder pit 3rd closes completely as long as the cam roller 10 the peripheral portion 11a of the cam 11 rolls, and the cover 7 is partially opened when the Cam roller 10 which are curved outwards Circumferential regions 11b of the control cam 11 pass.
  • the cover 7 is thus opened by partial Unfold in the side where the grippers 4 are arranged are.
  • the cover 7 is as curved as that Impression cylinder surface so that in their Closed position ( Figure 2) of the pressure cylinder 1 a continuously closed surface. Furthermore the material of the cover 7 corresponds to the material of the impression cylinder surface and therefore has the same Hardness like this; in the example considered it is is preferably a metallic material.
  • the cover 7 is so during Printing operation adjusted as follows:
  • the cover 7 only in the area of sheet acceptance and Sheet delivery their opening position.
  • the order can, however, also be made so that the opening position between delivery of a printed sheet and takeover of an incoming Bow is maintained. It is essential that the Cover 7 assumes its closed position while a Cylinder pit passes the pressure gap.

Abstract

PCT No. PCT/CH97/00061 Sec. 371 Date Aug. 12, 1998 Sec. 102(e) Date Aug. 12, 1998 PCT Filed Feb. 18, 1997 PCT Pub. No. WO97/29912 PCT Pub. Date Aug. 21, 1997The invention relates to an impression cylinder (1) intended for a sheet-fed machine and having at least one cylinder gap (3) in which sheet grippers (4) are arranged in such a manner that, when closed, they do not project over the envelope of the peripheral area of the impression cylinder (1). The cylinder gap (3) is provided with a cover (7) which can be adjusted by a controlling unit (9, 10, 11, 12) and is subsequently always in its closed position in which it completely covers the cylinder gap (3), when said gap (3) passes through the nip. Consequently, the impression cylinder rolls with a continuous, closed peripheral area on the cylinder printing the image. In the zones where the sheet is transferred to and from the impression cylinder (1), the cover (7) (preferably controlled by a fixed cam (11) while the cylinder is rotating) is opened to such an extent that the sheet grippers (4) can move into the open position thereof to pick up or release a sheet.

Description

Die Erfindung bezieht sich auf einen Druckzylinder einer Bogendruckmaschine, der wenigstens eine Zylindergrube aufweist, in der Bogengreifer angeordnet sind.The invention relates to an impression cylinder a sheet-fed printing machine that has at least one Has cylinder pit, arranged in the bow gripper are.

Druckzylinder dieser Art sind seit langem bekannt, insbesondere in indirekt druckenden Druckwerken wie Offsetdruckmaschinen (zum Beispiel GB-Patentschrift 1138369), in direkt druckenden Druckwerken wie Stichtiefdruckmaschinen sowie auch in Siebdruckmaschinen. In allen Fällen haben die bisher bekannten Druckzylinder durch Zylindergruben getrennte Drucksättel, wobei die Umfangslänge der Drucksättel den zu druckenden Bogen angepasst ist und die dazwischen liegenden Zylindergruben zur Unterbringung der Bogengreifer erforderlich sind.Printing cylinders of this type have long been known especially in indirect printing units such as Offset printing machines (e.g. GB patent 1138369), in direct printing units such as Intaglio printing machines as well as in Screen printing machines. In all cases they have so far known pressure cylinder separated by cylinder pits Pressure calipers, the circumferential length of the pressure calipers sheet to be printed is adjusted and the in between lying cylinder pits to accommodate the Bow grabs are required.

Diese Druckzylinderausbildung mit durch Zylindergruben unterbrochener Umfangsfläche führt bei verschiedenen Druckverfahren zu Problemen. Bei jedem Druckeinsatz, wenn also ein Drucksattel schlagartig mit dem zusammenwirkenden, das Bild druckenden Zylinder in Kontakt kommt, findet eine Stossanregung statt, die die Qualität des Drucks beeinträchtigen kann. Beim Offsetdruck können ausserdem Veränderungen der Druckspannung zwischen dem Gummizylinder und dem Druckzylinder auftreten. Im Falle schlanker Zylinder, bei denen also die Länge grösser als der Durchmesser ist, können infolge der ungenügenden Steifigkeit der Zylinder und durch die Stossanregung unerwünschte Schwingungsstreifen entstehen. This pressure cylinder training with through Cylinder pits of interrupted circumferential surface lead to different printing methods to problems. With everyone Use of pressure, if suddenly a pressure caliper with the cooperating cylinder printing the image in If there is contact, there is a stimulus that the Print quality. At the Offset printing can also change the Compressive stress between the rubber cylinder and the Impression cylinders occur. In the case of slim cylinders, where the length is greater than the diameter is, due to the insufficient rigidity of the Cylinder and undesirable due to the shock excitation Vibration stripes arise.

Ein besonderes Problem besteht bei Rotations-Siebdruckmaschinen, bei denen auf dem Umfang des Formzylinders eine elastisch nachgiebige Siebdruckschablone aufgespannt ist. Diese Siebdruckschablone wird am Druckspalt innen von einer Rakel beaufschlagt, welche den für den Druckvorgang erforderlichen Farbwulst vor dem Druckspalt anhäuft. Beim Passieren einer Zylindergrube des Druckzylinders kann sich die Siebdruckschablone nicht mehr auf dem Umfang des Druckzylinders abstützen und wird unter der Wirkung des Rakeldrucks mehr oder weniger in die Zylindergrube hineingedrückt, wodurch sie beschädigt werden kann. Um diese Gefahr zu vermeiden, wurde bereits in der älteren europäischen Patentanmeldung Nr. 96810043.8 der gleichen Anmelderin vorgeschlagen, die Rakel im Innern des Siebdruckzylinders verstellbar zu montieren, so dass sie durch den Steilmechanismus jedesmal von der Siebdruckschablone abgehoben wird, wenn eine Zylindergrube des Druckzylinders den Druckspalt passiert.There is a particular problem with rotary screen printing machines, where on the scope of the Forme cylinder an elastically compliant Screen printing template is stretched. This Screen printing stencil is on the inside of a printing nip Squeegee which is used for the printing process required bead of paint in front of the printing nip. When passing through a cylinder pit of the impression cylinder can the screen printing stencil no longer on the Support the circumference of the printing cylinder and is under the Effect of squeegee pressure more or less in the Cylinder pit pushed in, causing damage can be. To avoid this danger, already in the older European patent application no. 96810043.8 to the same applicant, which Squeegee adjustable inside the screen printing cylinder assemble so that it through the steep mechanism is lifted off the screen printing stencil each time, if a cylinder pit of the impression cylinder den Pressure gap happens.

Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, einen Druckzylinder einer Bogendruckmaschine so auszubilden, dass die mit dem Vorhandensein von Zylindergruben zusammenhängenden Effekte und Nachteile beim Druckvorgang auf einfache Weise vermieden werden.The object of the present invention is to achieve Basically, a printing cylinder of a sheetfed press like this train that with the presence of Cylinder pits related effects and disadvantages can be avoided in a simple manner during the printing process.

Zur Lösung dieser Aufgabe ist der Druckzylinder nach der Erfindung dadurch gekennzeichnet, dass die Bogengreifer in ihrer Schliesstellung die Einhüllende der zylindrischen Umfangsfläche des Druckzylinders nicht überragen und dass jede Zylindergrube mit einer durch einen Stellmechanismus verstellbaren Abdeckung versehen ist, die in einer ersten Stellung die Zylindergrube mit den in ihrer Schliesstellung befindlichen Greifern vollständig abdeckt und die zylindrische Umtangsfläche des Druckzylinders ergänzt und welche in einer zweiten Stellung die Zylindergrube im Bereich der Greifer wenigstens teilweise freigibt.The printing cylinder is used to solve this task characterized in that the Bow gripper in its closed position the envelope the cylindrical peripheral surface of the impression cylinder do not protrude and that each cylinder pit with a adjustable cover by an adjusting mechanism is provided, which in a first position Cylinder pit with the in their closed position located grippers completely and the cylindrical circumferential surface of the impression cylinder added and which in a second position the cylinder pit at least partially releases in the area of the gripper.

Auf diese Weise lässt sich der Druckzylinder mit seinem Stellmechanismus so ausbilden, dass eine Zylindergrube jedes Mal vollständig geschlossen ist, wenn sie während des Druckbetriebs den Druckspalt passiert, jedoch während des Bogentransfers zum und vom Druckzylinder von der Abdeckung so weit freigegeben wird, dass die Greifer ihre Oeffnungsstellung einnehmen können und der Bogentransfer in üblicher Weise stattfinden kann. Wenn zum Bogentransfer zum und vom Druckzylinder Transferzylinder mit Bogengreifern vorgesehen sind, dann wird eine Zylindergrube des Druckzylinders beim Bogentransfer so weit geöffnet, dass die Bogengreifer des betreffenden Transferzylinders, wie üblich, etwas in diese Zylindergrube eintauchen können.In this way, the printing cylinder can be used train its adjusting mechanism so that a Cylinder pit is completely closed every time if the print nip during printing happens, but during the sheet transfer to and from Printing cylinder released from the cover so far is that the grippers take up their open position can and the sheet transfer in the usual way can take place. When transferring sheets to and from Printing cylinder transfer cylinder with sheet grippers are provided, then a cylinder pit of the Printing cylinder opened so wide during sheet transfer, that the bow grab of the concerned Transfer cylinders, as usual, something in this Can immerse the cylinder pit.

Durch die Erfindung wird erreicht, dass der Druckzylinder beim Druckbetrieb mit einer geschlossenen, praktisch kontinuierlichen Oberfläche stetig an dem das Bild druckenden Zylinder abrollt, bei dem es sich insbesondere um einen Siebdruckzylinder einer Siebdruckmaschine oder einen Gummizylinder einer Offsetdruckmaschine handeln kann. Der Druckzylinder nach der Erfindung kann auch in einer Prägedruckmaschine verwendet werden. Aufbau und Oberfläche des Druckzylinders und seiner Drucksättel sind jeweils dem Druckmaschinentyp angepasst. Vorzugsweise entspricht die harte oder hinreichend starre Oberfläche der Abdeckung der des Druckzylinders.It is achieved by the invention that the Printing cylinder when printing with a closed, practically continuous surface rolls continuously on the cylinder printing the image, at which is particularly a screen printing cylinder a screen printing machine or a blanket cylinder Offset printing machine can act. The impression cylinder according to the invention can also in a Embossing printing machine can be used. Construction and Surface of the impression cylinder and its saddles are each adapted to the press type. Preferably, the hard or adequate rigid surface of the cover of that of the impression cylinder.

Im Falle einer Siebdruckmaschine ergibt sich der besondere Vorteil, dass keine zusätzlichen Mittel vorgesehen werden müssen, die verhindern, dass die elastische Siebdruckschablone beim Druckvorgang durch die innen anliegende Rakel in eine Zylindergrube des Druckzylinders hineingedrückt und beschädigt wird. Auch im Falle einer sogenannten "gapless" Bogenoffsetdruckmaschine, bei der Plattenzylinder und Gummizylinder kontinuierlich geschlossene Umfangsflächen haben, ist ein Druckzylinder nach der Erfindung mit beim Druckvorgang geschlossener Umfangsfläche sehr vorteilhaft, weil er Stossanregungen und Veränderungen der Druckspannung zwischen Gummizylinder und Druckzylinder wirksam verhindert.In the case of a screen printing machine, the result is special advantage that no additional funds must be provided to prevent the elastic screen printing stencil during the printing process the squeegee inside into a cylinder pit of the Printing cylinder is pushed in and damaged. Also in the case of a so-called "gapless" Sheetfed offset printing machine, in the plate cylinder and Rubber cylinder continuously closed Have circumferential surfaces, is a pressure cylinder after the Invention with closed during printing Circumferential surface very advantageous because it stimulates impacts and changes in compressive stress between Rubber cylinder and impression cylinder effectively prevented.

Zweckmässige Ausgestaltungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.Appropriate embodiments of the invention result themselves from the dependent claims.

Die Erfindung wird anhand der Zeichnung an einem Ausführungsbeispiel näher erläutert.

  • Figur 1 zeigt einen mit einem Siebdruckzylinder zusammenwirkenden Druckzylinder nach der Erfindung in derjenigen relativen Stellung, in welcher sich eine teilweise offene Zylindergrube etwa eine Vierteldrehung vor dem Druckspalt befindet, wobei beide Zylinder nur teilweise dargestellt sind.
  • Figur 2 zeigt die beiden Zylinder nach Figur 1 in derjenigen Stellung, in welcher die vollständig geschlossene Zylindergrube gerade den Druckspalt passiert hat.
    • The invention is explained in more detail with reference to the drawing using an exemplary embodiment.
  • Figure 1 shows a printing cylinder cooperating with a screen printing cylinder according to the invention in the relative position in which a partially open cylinder pit is located about a quarter of a turn in front of the printing nip, both cylinders being shown only partially.
  • FIG. 2 shows the two cylinders according to FIG. 1 in the position in which the completely closed cylinder pit has just passed the pressure gap.

    • In der Darstellung nach den Figuren wirkt ein Druckzylinder 1 nach der Erfindung mit einem Siebdruckzylinder 2 zusammen, dessen Umfang von einer zylindrischen, elastischen Siebdruckschablone 2a gebildet wird und in dessem Innern der von einer Rakel 2b angehäufte Farbwulst 2c angedeutet ist. Beide Zylinder, die sich im Sinne der Pfeile drehen, bilden zwischen sich den Druckspalt, durch den die Bogen B vom Druckzylinder 1 zwecks Bedruckung hindurchgeführt werden.In the illustration according to the figures there is an effect Printing cylinder 1 according to the invention with a Screen printing cylinder 2 together, the scope of one cylindrical, elastic screen printing stencil 2a is formed and inside that by a doctor 2b accumulated paint bead 2c is indicated. Both Form cylinders that rotate in the direction of the arrows between them the pressure gap through which the sheet B from Printing cylinder 1 passed through for printing become.

    Der Druckzylinder 1 hat im betrachteten Beispiel nur eine Zylindergrube 3 und daher nur einen Drucksattel zur Aufnahme eines Bogens B. Natürlich kann der Druckzylinder auch zwei oder mehr gleichmässig verteilte Zylindergruben und Drucksättel zur Aufnahme von zwei oder mehr Bogen haben, wobei alle Zylindergruben gleich ausgebildet sind.The printing cylinder 1 has in the example considered only one cylinder pit 3 and therefore only one Pressure saddle for receiving a sheet B. Of course it can the impression cylinder also two or more evenly Distributed cylinder pits and pressure saddles for admission of two or more sheets, all Cylinder pits are of the same design.

    In der Zylindergrube 3 sind um eine Greiferwelle 5 verstellbare Bogengreifer 4 montiert, die in bekannter Weise zwischen einer Oeffnungsstellung (Figur 1), in welcher die Greiferkanten 4a den Zylinderumfang etwas überragen, und einer Schliesstellung (Figur 2) verstellbar sind, in welcher die Greifer 4 den Zylinderumfang nicht überragen. In der Schliesstellung drücken die Greifer 4 mit ihren Greiferkanten 4a die Vorderkante eines Bogens B gegen eine Greiferauflage 6, welche, ausgehend von der Umfangsfläche des Druckzylinders, etwas nach innen geneigt ist.In the cylinder pit 3 are around a gripper shaft 5 adjustable bow gripper 4 mounted in known Way between an open position (Figure 1), in which the gripper edges 4a somewhat the cylinder circumference protrude, and a closed position (Figure 2) are adjustable, in which the gripper 4 Do not exceed cylinder circumference. In the closed position press the grippers 4 with their gripper edges 4a Leading edge of a sheet B against a gripper pad 6, which, starting from the peripheral surface of the Pressure cylinder, is slightly inclined inwards.

    Die Zylindergrube ist ferner mit einer verstellbaren Abdeckung 7 versehen, welche um eine Welle 8 zwischen einer geschlossenen Stellung (Figur 2) und einer die Zylindergrube teilweise freigebenden Oeffnungsstellung (Figur 1) verstellbar ist. Der Steilmechanismus besteht aus einem Steuerhebel in Form eines Winkelhebeis 9, dessen eines Ende im Bereich der Welle 8 fest mit der Abdeckung 7 verbunden ist und dessen anderes Ende eine Nockenrolle 10 trägt, aus einer stationären Steuerkurve 11, welche bei Drehung des Druckzylinders 1 die Nockenrolle 10 und damit den Winkelhebel 9 mit der Abdeckung 7 führt, und aus einer den Winkelhebel 9 mit seiner Nockenrolle 10 gegen den Umfang der Steuerkurve 11 drückenden Feder 12, die am rotierenden Druckzylinder 1 angebracht ist.The cylinder pit is also with a adjustable cover 7, which by a Shaft 8 between a closed position (Figure 2) and one partially releasing the cylinder pit Open position (Figure 1) is adjustable. Of the Steep mechanism consists of a control lever in the form an angle lift 9, one end of which in the area of Shaft 8 is firmly connected to the cover 7 and the other end of which carries a cam roller 10 a stationary cam 11, which when rotating of the pressure cylinder 1, the cam roller 10 and thus the Angle lever 9 with the cover 7 leads, and from a the angle lever 9 with its cam roller 10 against the Scope of the cam 11 pressing spring 12, which on rotating printing cylinder 1 is attached.

    Die Steuerkurve 11 hat einen zur Achse des Druckzylinders 1 konzentrischen Umfangsbereich 11a und zwei nach aussen vorspringende Umfangsbereiche, die sich jeweils in den Bereichen der Bogenübernahme zum Druekzylinder und der Bogenübergabe vom Druckzylinder befinden und von denen in den Figuren nur der nach aussen gewölbte Umfangsbereich 11b im Bereich der Bogenübernahme zu sehen ist. Die Anordnung ist so getroffen, dass die Abdeckung 7 die Zylindergrube 3 vollständig schliesst, solange die Nockenrolle 10 auf dem Umfangsbereich 11a der Steuerkurve 11 abrollt, und die Abdeckung 7 teilweise geöffnet wird, wenn die Nockenrolle 10 die nach aussen gewölbten Umfangsbereiche 11b der Steuerkurve 11 passiert. Das Oeffnen der Abdeckung 7 erfolgt also durch teilweises Aufklappen in der Seite, wo die Greifer 4 angeordnet sind.The control curve 11 has one to the axis of the Printing cylinder 1 concentric peripheral region 11a and two outwardly projecting peripheral areas, the each in the areas of the bow transfer to Printing cylinder and sheet transfer from the printing cylinder are located and of which in the figures only after outside curved peripheral area 11b in the area of Arch acceptance can be seen. The arrangement is like this hit that the cover 7 the cylinder pit 3rd closes completely as long as the cam roller 10 the peripheral portion 11a of the cam 11 rolls, and the cover 7 is partially opened when the Cam roller 10 which are curved outwards Circumferential regions 11b of the control cam 11 pass. The The cover 7 is thus opened by partial Unfold in the side where the grippers 4 are arranged are.

    Die Abdeckung 7 ist genau so gekrümmt wie die Druckzylinderoberfläche, so dass in ihrer Schliesstellung (Figur 2) der Druckzylinder 1 eine kontinuierlich geschlossene Oberfläche hat. Ausserdem entspricht das Material der Abdeckung 7 dem Material der Druckzylinderoberfläche und hat also die gleiche Härte wie diese ; im betrachteten Beispiel handelt es sich vorzugsweise um ein metallisches Material.The cover 7 is as curved as that Impression cylinder surface so that in their Closed position (Figure 2) of the pressure cylinder 1 a continuously closed surface. Furthermore the material of the cover 7 corresponds to the material of the impression cylinder surface and therefore has the same Hardness like this; in the example considered it is is preferably a metallic material.

    Um in der Schliesstellung der Abdeckung den Spalt zwischen dem den Bogengreifern 4 abgewandten Ende der Abdeckung 7 und der benachbarten Druckzylinderoberfläche möglichst nahtlos zu überbrücken, ist an der den Bogengreifern 4 abgewandten Seite der Zylindergrube 3, in Verlängerung der Zylinderumfangsfläche, eine elastische Auflage 13 angebracht, an deren Unterseite ein etwas nach innen versetztes Endstück 7a der Abdeckung 7 in der Schliesstellung anliegt, wie in Figur 2 gezeigt.To the gap in the closed position of the cover between the end facing away from the bow grippers 4 Cover 7 and the neighboring one Printing cylinder surface as seamlessly as possible bridge, is on the bow grippers 4 facing away Side of the cylinder pit 3, in extension of the Cylinder peripheral surface, an elastic pad 13 attached, on the underside of which a little inward offset end piece 7a of the cover 7 in the Close position is present, as shown in Figure 2.

    Die Abdeckung 7 wird also während des Druckbetriebs wie folgt verstellt:The cover 7 is so during Printing operation adjusted as follows:

    Zur Uebernahme eines ankommenden Bogen, der beispielsweise von den Bogengreifern eines nicht dargestellten Transferzylinders an die Bogengreifer 4 in der Zylindergrube 3 des Druckzylinders 1 zu übergeben ist, wird die Abdeckung 7, wie in Figur 1 dargestellt, teilweise so weit geöffnet, dass die Bogengreifer 4 ihre Oeffnungsstellung einnehmen und die Bogengreifer des Transferzylinders, welche die Voderkante des Bogens halten, hinreichend in die Zylindergrube 3 eintauchen können. Sobald die vordere Kante des ankommenden Bogens unter die Greiferkanten 4a der Bogengreifer 4 gelangt ist, werden diese Greifer in bekannter Weise in ihre Schliesstellung verstellt, wodurch die von den Greifern des Transferzylinders freigegebene Bogenkante zwischen den Greiferkanten 4a und der Greiferauflage 6 eingeklemmt wird. Bei Weiterdrehung des Druckzylinders 1 gelangt die Nockenrolle 10 auf die Umfangszone 11a der Steuerkurve 11 und bewirkt dadurch das Schliessen der Abdeckung 7, welche die Zylindergrube mit den geschlossenen Bogengreifern 4 vollständig abdeckt. Dabei übergreift das über den Greifern 4 liegende Ende der Abdeckung 7 die Bogenvorderkante. In dieser geschlossenen Stellung passiert die starr ausgebildete Abdeckung 7 den Druckspalt (Figur 2), wobei sie als feste Abstützung für die gegen die Siebdruckschablone 2a drückende Rakel 2b dient, so dass die Siebdruckschablone nicht beschädigt werden kann. Eine Abhebung der Rakel ist also nicht erforderlich.To take over an incoming sheet, the For example, one of the bow grabbers does not shown transfer cylinder to the sheet gripper 4th in the cylinder pit 3 of the impression cylinder 1 is transferred, the cover 7, as in Figure 1 shown, partially so wide that the Bow grab 4 take their open position and the Bow gripper of the transfer cylinder, which the Hold the front edge of the sheet sufficiently into the Can dip cylinder pit 3. Once the front Edge of the incoming sheet under the gripper edges 4a the bow gripper 4 has reached, these grippers are in adjusted to its closed position in a known manner, which means that of the grippers of the transfer cylinder released sheet edge between the gripper edges 4a and the gripper pad 6 is clamped. At Further rotation of the printing cylinder 1 arrives Cam roller 10 on the peripheral zone 11a of the cam 11 and thereby causes the cover 7 to close, which the cylinder pit with the closed Bow grippers 4 completely covers. This spills over the end of the cover 7 lying above the grippers 4 the leading edge of the sheet. In this closed position passes the rigid cover 7 den Pressure gap (Figure 2), being a fixed support for the squeegee pressing against the screen printing stencil 2a 2b serves so that the screen printing stencil is not can be damaged. The squeegee is lifted off so not necessary.

    In der Darstellung nach Figur 2 hat die geschlossene Abdeckung 7 gerade den Druckspalt vollständig passiert, und die Bedruckung des Bogens B beginnt. Sobald anschliessend die Nockenrolle 10, im Bereich der Bogenübergabe, auf dem nicht dargestellten, dem gewölbten Bereich 11b der Steuerkurve 11 entprechenden gewölbten Bereich abrollt, nimmt die Abdeckung 7 wieder ihre Oeffnungsstellung ein, sodass die Bogengreifer 4 öffnen und die Bogenkante freigeben können, welche von der den Bogen weitertransportierenden Transfervorrichtung, insbesondere einem Transferzylinder mit Bogengreifern, übernommen wird.In the illustration according to FIG. 2, the closed cover 7 just the printing nip completely happened, and the printing of sheet B begins. As soon as the cam roller 10, in Area of the sheet transfer, on the not shown, the curved area 11b of the control curve 11 corresponding domed area rolls, the Cover 7 again in its open position so that open the sheet gripper 4 and release the sheet edge can which of the the bow onward transfer device, especially a transfer cylinder with sheet grippers, is taken over.

    Im betrachteten Beispiel nimmt die Abdeckung 7 lediglich im Bereich der Bogenübernahme und der Bogenübergabe ihre Oeffnungsstellung ein. Die Anordnung kann jedoch ohne weiteres auch so getroffen sein, dass die Oeffnungsstellung zwischen Uebergabe eines bedruckten Bogens und Uebernahme eines ankommenden Bogens beibehalten wird. Wesentlich ist, dass die Abdeckung 7 ihre Schliesstellung einnimmt, während eine Zylindergrube den Druckspalt passiert.In the example considered, the cover 7 only in the area of sheet acceptance and Sheet delivery their opening position. The order can, however, also be made so that the opening position between delivery of a printed sheet and takeover of an incoming Bow is maintained. It is essential that the Cover 7 assumes its closed position while a Cylinder pit passes the pressure gap.

    Bei anderen Typen von Bogendruckmaschinen, wie Offsetdruck- und Prägedruckmaschinen, entfällt bei Verwendung eines Druckzylinders nach der Erfindung die Stossanregung beim Druckeinsatz, wodurch nicht nur eine Beeinträchtigung der Druckgualität vermieden wird, sondern auch höhere Druckgeschwindigkeiten als bisher erzielt werden können.In other types of sheet printing machines, such as Offset printing and embossing printing machines are not necessary for Use of a printing cylinder according to the invention Impact excitation when printing, which means not only one Impairment of printing quality is avoided, but also higher printing speeds than before can be achieved.

    Claims (5)

    1. Impression cylinder for a sheet printing machine, having at least one cylinder pit (3) in which sheet grippers (4) are arranged, characterised in that the sheet grippers (4), when in closed position, do not rise above the peripheral surface of the cylinder (1) and in that each cylinder pit (3) is provided with a cover (7) which is movable by an adjusting mechanism (9-12) in a first position in which the cover (7) completely covers the cylinder pit (3) with the grippers (4) in closed position thereby completing the peripheral surface of the impression cylinder (1), and in a second position in which the cover (7) opens at least partially the pit (3) in the region of the grippers (4).
    2. Impression cylinder as claimed in claim 1, characterised in that the cover (7) is movable around a spindle (8) placed inside the cylinder pit (3).
    3. Impression cylinder as claimed in claim 1 or 2, characterised in that the cover (7), when in closed position, applies on an elastic strip (13) at the end of the pit (13) opposed to the grippers (4), said strip filling the gap between said end of the cover and the surface of the impression cylinder.
    4. Impression cylinder as claimed in any of claims 1 to 3, characterised in that the adjusting mechanism comprises a fixed radial cam (11).
    5. Impression cylinder as claimed in any of claims 1 to 4, characterised in that the material of the cover (7) corresponds to the material of the surface of the impression cylinder.
    EP97902144A 1996-02-19 1997-02-18 Impression cylinder of a sheet-fed machine Expired - Lifetime EP0883493B1 (en)

    Applications Claiming Priority (4)

    Application Number Priority Date Filing Date Title
    CH42996 1996-02-19
    CH429/96 1996-02-19
    CH42996 1996-02-19
    PCT/CH1997/000061 WO1997029912A1 (en) 1996-02-19 1997-02-18 Impression cylinder of a sheet-fed machine

    Publications (2)

    Publication Number Publication Date
    EP0883493A1 EP0883493A1 (en) 1998-12-16
    EP0883493B1 true EP0883493B1 (en) 1999-12-22

    Family

    ID=4186824

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97902144A Expired - Lifetime EP0883493B1 (en) 1996-02-19 1997-02-18 Impression cylinder of a sheet-fed machine

    Country Status (12)

    Country Link
    US (1) US5960716A (en)
    EP (1) EP0883493B1 (en)
    JP (1) JP4023629B2 (en)
    KR (1) KR100438111B1 (en)
    CN (1) CN1097511C (en)
    AT (1) ATE187928T1 (en)
    AU (1) AU713139B2 (en)
    CA (1) CA2241973C (en)
    DE (1) DE59700889D1 (en)
    RU (1) RU2170177C2 (en)
    UA (1) UA53644C2 (en)
    WO (1) WO1997029912A1 (en)

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    Also Published As

    Publication number Publication date
    JP2000504643A (en) 2000-04-18
    CA2241973C (en) 2004-12-07
    CN1211214A (en) 1999-03-17
    DE59700889D1 (en) 2000-01-27
    CN1097511C (en) 2003-01-01
    AU713139B2 (en) 1999-11-25
    EP0883493A1 (en) 1998-12-16
    RU2170177C2 (en) 2001-07-10
    ATE187928T1 (en) 2000-01-15
    CA2241973A1 (en) 1997-08-21
    JP4023629B2 (en) 2007-12-19
    US5960716A (en) 1999-10-05
    WO1997029912A1 (en) 1997-08-21
    KR19990082466A (en) 1999-11-25
    KR100438111B1 (en) 2004-07-16
    UA53644C2 (en) 2003-02-17
    AU1588197A (en) 1997-09-02

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