EP0883493A1 - Impression cylinder of a sheet-fed machine - Google Patents

Impression cylinder of a sheet-fed machine

Info

Publication number
EP0883493A1
EP0883493A1 EP97902144A EP97902144A EP0883493A1 EP 0883493 A1 EP0883493 A1 EP 0883493A1 EP 97902144 A EP97902144 A EP 97902144A EP 97902144 A EP97902144 A EP 97902144A EP 0883493 A1 EP0883493 A1 EP 0883493A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
printing
sheet
cover
grippers
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.)
Granted
Application number
EP97902144A
Other languages
German (de)
French (fr)
Other versions
EP0883493B1 (en
Inventor
Johannes Georg Schaede
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.)
KBA Notasys SA
Original Assignee
De la Rue Giori SA
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 De la Rue Giori SA filed Critical De la Rue Giori SA
Publication of EP0883493A1 publication Critical patent/EP0883493A1/en
Application granted granted Critical
Publication of EP0883493B1 publication Critical patent/EP0883493B1/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
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers

Definitions

  • the invention relates to a printing cylinder of a sheet-fed printing machine, which has at least one cylinder pit in which sheet grippers are arranged.
  • Printing cylinders of this type have been known for a long time, in particular in indirectly printing printing units such as offset printing presses (for example GB patent specification 1138369), in directly printing printing units such as intaglio printing machines and also in screen printing machines.
  • the previously known printing cylinders have pressure saddles separated by cylinder pits, the circumferential length of the pressure saddle being adapted to the sheets to be printed and the cylinder pits lying in between are required to accommodate the sheet grippers.
  • This screen printing stencil is acted upon by a squeegee on the inside of the printing nip, which accumulates the ink bead required for the printing process in front of the printing nip.
  • the screen printing template When passing through a cylinder pit of the printing cylinder, the screen printing template can no longer be supported on the circumference of the printing cylinder and is more or less pressed into the cylinder pit under the effect of the doctor blade pressure, as a result of which it can be damaged.
  • the present invention is based on the object of designing a printing cylinder of a sheet-fed printing press in such a way that the effects and disadvantages associated with the presence of cylinder pits are avoided in a simple manner during the printing process.
  • the printing cylinder according to the invention is characterized in that the sheet grippers in their closed position do not protrude beyond the envelope of the cylindrical circumferential surface of the printing cylinder and that each cylinder pit is provided with a cover which can be adjusted by an adjusting mechanism which, in a first position, Completely covers the cylinder pit with the grippers located in its closed position and supplements the cylindrical peripheral surface of the pressure cylinder and which, in a second position, at least partially releases the cylinder pit in the area of the grippers.
  • the printing cylinder with its adjusting mechanism can be designed such that a cylinder pit is completely closed each time it passes through the printing nip during the printing operation, but is released so far from the cover during the sheet transfer to and from the printing cylinder that the grippers are released can take their open position and the sheet transfer can take place in the usual way. If transfer cylinders with sheet grippers are provided for sheet transfer to and from the printing cylinder, then a cylinder pit of the printing cylinder is opened so far during sheet transfer that the sheet grippers of the transfer cylinder in question can, as usual, dip somewhat into this cylinder pit.
  • the printing cylinder continuously rolls on the image-printing cylinder during the printing operation with a closed, practically continuous surface, which can in particular be a screen printing cylinder of a screen printing machine or a rubber cylinder of an offset printing machine.
  • the printing cylinder according to the invention can also be used in an embossing printing machine.
  • the structure and surface of the printing cylinder and its printing saddle are each adapted to the type of printing press.
  • the hard or sufficiently rigid surface of the cover preferably corresponds to that of the printing cylinder.
  • 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.
  • a pressure cylinder 1 acts with a Screen printing cylinder 2 together, the circumference of which is formed by a cylindrical, elastic screen printing stencil 2a and the interior of which is indicated by the ink bead 2c accumulated by a doctor blade 2b. Both cylinders, which rotate in the direction of the arrows, form between them the printing nip through which the sheets B are passed by the printing cylinder 1 for the purpose of printing.
  • the pressure cylinder 1 has only one cylinder pit 3 and therefore only one pressure saddle for receiving an arc B.
  • the pressure cylinder can also have two or more evenly distributed cylinder pits and pressure saddle for receiving two or more arcs, all of the cylinder pits being of the same design .
  • adjustable bow grippers 4 are mounted, which are adjustable in a known manner between an open position (FIG. 1) in which the gripper edges 4a project somewhat beyond the cylinder circumference and a closed position (FIG. 2) in which the grippers 4 do not protrude the circumference of the cylinder.
  • FIG. 1 In the closed position, the grippers 4, with their gripper edges 4a, print the front edge of a sheet B against a gripper support 6, which, starting from the circumferential surface of the printing cylinder, is inclined somewhat inwards.
  • the cylinder pit is also provided with an adjustable cover 7 which is adjustable about a shaft 8 between a closed position (FIG. 2) and an opening position partially releasing the cylinder pit (FIG. 1).
  • the adjusting mechanism consists of a control lever in the form an angle lever 9, one end of which is fixedly connected to the cover 7 in the area of the shaft 8 and the other end of which carries a cam roller 10, from a stationary control cam 11 which, when the pressure cylinder 1 rotates, 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 circumference of the cam 11 printing spring 12 which is attached to the rotating pressure cylinder 1.
  • the control cam 11 has a circumferential region 11a concentric to the axis of the printing cylinder 1 and two outwardly projecting circumferential regions, which are located in the areas of sheet transfer to the printing cylinder and the sheet transfer from the printing cylinder and of which in the figures only the outwardly curved circumferential region Ilb im Area of the sheet transfer can be seen.
  • the arrangement is such that the cover 7 closes the cylinder pit 3 completely as long as the cam roller 10 rolls on the peripheral region 11a of the control cam 11, and the cover 7 is partially opened when the cam roller 10 moves the outwardly curved peripheral regions 11b of the control cam 11 happens.
  • the cover 7 is thus opened by partially opening it in the side where the grippers 4 are arranged.
  • the cover 7 is curved in exactly the same way as the printing cylinder surface, so that in its closed position (FIG. 2) the printing cylinder 1 has a continuously closed surface.
  • the material of the cover 7 corresponds to the material of the printing cylinder surface and therefore has the same Hard like this; in the example considered, it is preferably a metallic material.
  • an elastic support 13 is attached to the side of the cylinder pit 3 facing away from the sheet grippers 4, as an extension of the circumferential surface of the cylinder. on the underside of which there is a somewhat inwardly displaced end piece 7a of the cover 7 in the closed position, as shown in FIG.
  • the cover 7 is therefore adjusted as follows during the printing operation:
  • the cover 7, as shown in FIG. 1 is partially opened so far that the sheet grippers 4 take their open position and the sheet grippers of the transfer cylinder, which hold the front edge of the sheet, can plunge sufficiently into the cylinder pit 3.
  • these grippers are adjusted to their closed position in a known manner, as a result of which the sheet edge released by the grippers of the transfer cylinder is clamped between the gripper edges 4a and the gripper support 6.
  • the cam roller 10 reaches the peripheral zone 11a of the control cam 11 and thereby causes the cover 7 to be closed, which completely covers the cylinder pit with the closed sheet grippers 4.
  • the end of the cover 7 lying above the grippers 4 overlaps the leading edge of the sheet.
  • the rigid cover 7 passes the printing nip (FIG. 2), serving as a fixed support for the squeegee 2b printing against the screen printing stencil 2a, so that the screen printing stencil cannot be damaged. It is therefore not necessary to lift the squeegee.
  • the closed cover 7 has just passed completely through the printing nip, and printing on the sheet B begins.
  • the cam roller 10 in the area of the sheet transfer, then rolls on the not shown area corresponding to the curved area 11b of the control curve 11, the cover 7 returns to its open position, so that the sheet gripper 4 can open and release the sheet edge, which of the transfer device transporting the sheet further, in particular a transfer cylinder with sheet grippers, is taken over.
  • the cover 7 assumes its opening position only in the area of the sheet transfer and the sheet transfer.
  • the arrangement can also be made so that the opening position between the transfer of a printed sheet and the transfer of an incoming sheet is maintained. It is essential that the Cover 7 assumes its closed position while a cylinder pit passes the pressure gap.
  • the shock excitation is eliminated when printing, which not only avoids impairment of the printing quality, but also higher printing speeds than previously can be achieved.
  • the invention is not limited to the exemplary embodiment described, but includes various other possibilities, in particular with regard to the adjusting mechanism.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Screen Printers (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Soil Working Implements (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Making Paper Articles (AREA)

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

Druckzylinder einer BogendruckmaschinePrinting cylinder of a sheet printing machine
Die Erfindung bezieht sich auf einen Druckzylinder einer Bogendruckmaschine, der wenigstens eine Zylindergrube aufweist, in der Bogengreifer angeordnet sind.The invention relates to a printing cylinder of a sheet-fed printing machine, which has at least one cylinder pit in which sheet grippers are arranged.
Druckzylinder dieser Art sind seit langem bekannt, insbesondere in indirekt druckenden Druckwerken wie Offsetdruckmaschmen (zum Beispiel GB-Patentschrift 1138369) , in direkt druckenden Druckwerken wie Stichtiefdruckmaschinen sowie auch in Siebdruckmaschinen. In allen Fallen haben die bisher bekannten Druckzylinder durch Zylindergruben getrennte Drucksattel, wobei die Umfangslange der Drucksattel den zu druckenden Bogen angepasst ist und die dazwischen liegenden Zylindergruben zur Unterbringung der Bogengreifer erforderlich sind.Printing cylinders of this type have been known for a long time, in particular in indirectly printing printing units such as offset printing presses (for example GB patent specification 1138369), in directly printing printing units such as intaglio printing machines and also in screen printing machines. In all cases, the previously known printing cylinders have pressure saddles separated by cylinder pits, the circumferential length of the pressure saddle being adapted to the sheets to be printed and the cylinder pits lying in between are required to accommodate the sheet grippers.
Diese Druckzylmderausbildung mit durch Zylindergruben unterbrochener Umfangsfläche fuhrt 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 Qualltat 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 Lange grösser als der Durchmesser ist, können infolge der ungenügenden Steifigkeit der Zylinder und durch die Stossanregung unerwünschte Schwingungsstreifen entstehen. Ein besonderes Problem besteht bei Rotations- Siebdruckmaschmen, 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 Druckzylmders abstutzen und wird unter der Wirkung des Rakeldrucks mehr oder weniger in die Zylindergrube hineingedruckt, wodurch sie beschädigt werden kann. Um diese Gefahr zu vermeiden, wurde bereits in der alteren europaischen Patentanmeldung Nr. 96810043.8 der gleichen Anmelderm vorgeschlagen, die Rakel im Innern des Siebdruckzylinders verstellbar zu montieren, so dass sie durch den Stellmechanismus jedesmal von der Siebdruckschablone abgehoben wird, wenn eine Zylindergrube des Druckzylinders den Druckspalt passiert.This formation of a printing cylinder with a circumferential surface interrupted by cylinder pits leads to problems in various printing processes. Every time a print is used, i.e. when a pressure saddle suddenly comes into contact with the interacting cylinder that prints the image, there is an impact excitation that can impair the quality of the print. In offset printing, changes in the compressive stress between the blanket cylinder and the impression cylinder can also occur. In the case of slim cylinders, in which the length is greater than the diameter, undesirable vibration stripes can occur due to the insufficient rigidity of the cylinders and the shock excitation. There is a particular problem with rotary screen printing machines in which an elastically flexible screen printing stencil is stretched over the circumference of the forme cylinder. This screen printing stencil is acted upon by a squeegee on the inside of the printing nip, which accumulates the ink bead required for the printing process in front of the printing nip. When passing through a cylinder pit of the printing cylinder, the screen printing template can no longer be supported on the circumference of the printing cylinder and is more or less pressed into the cylinder pit under the effect of the doctor blade pressure, as a result of which it can be damaged. In order to avoid this danger, it was already proposed in the older European patent application No. 96810043.8 by the same applicant to adjustably mount the squeegee inside the screen printing cylinder so that it is lifted from the screen printing stencil by the adjusting mechanism whenever a cylinder pit of the printing cylinder denies the Pressure gap happens.
Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, einen Druckzylinder einer Bogendruckmaschine so auszubilden, dass die mit dem Vorhandensein von Zylindergruben zusammenhangenden Effekte und Nachteile beim Druckvorgang auf einfache Weise vermieden werden.The present invention is based on the object of designing a printing cylinder of a sheet-fed printing press in such a way that the effects and disadvantages associated with the presence of cylinder pits are avoided in a simple manner during the printing process.
Zur Losung 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 m ihrer Schliesstellung befindlichen Greifern vollständig abdeckt und die zylindrische Umfangsfläche des Druckzylinders ergänzt und welche in einer zweiten Stellung die Zylindergrube im Bereich der Greifer wenigstens teilweise freigibt.To solve this problem, the printing cylinder according to the invention is characterized in that the sheet grippers in their closed position do not protrude beyond the envelope of the cylindrical circumferential surface of the printing cylinder and that each cylinder pit is provided with a cover which can be adjusted by an adjusting mechanism which, in a first position, Completely covers the cylinder pit with the grippers located in its closed position and supplements the cylindrical peripheral surface of the pressure cylinder and which, in a second position, at least partially releases the cylinder pit in the area of the grippers.
Auf diese Weise lasst sich der Druckzylinder mit seinem Stellmechanismus so ausbilden, dass eine Zylindergrube jedes Mal vollständig geschlossen ist, wenn sie wahrend des Druckbetriebs den Druckspalt passiert, jedoch wahrend 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 with its adjusting mechanism can be designed such that a cylinder pit is completely closed each time it passes through the printing nip during the printing operation, but is released so far from the cover during the sheet transfer to and from the printing cylinder that the grippers are released can take their open position and the sheet transfer can take place in the usual way. If transfer cylinders with sheet grippers are provided for sheet transfer to and from the printing cylinder, then a cylinder pit of the printing cylinder is opened so far during sheet transfer that the sheet grippers of the transfer cylinder in question can, as usual, dip somewhat into this cylinder pit.
Durch die Erfindung wird erreicht, dass der Druckzylinder beim Druckbetrieb mit einer geschlossenen, praktisch kontinuierlichen Oberflache 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 Pragedruckmaschine verwendet werden. Aufbau und Oberflache des Druckzylinders und seiner Drucksattel sind jeweils dem Druckmaschinentyp angepasst. Vorzugsweise entspricht die harte oder hinreichend starre Oberflache der Abdeckung der des Druckzylinders.It is achieved by the invention that the printing cylinder continuously rolls on the image-printing cylinder during the printing operation with a closed, practically continuous surface, which can in particular be a screen printing cylinder of a screen printing machine or a rubber cylinder of an offset printing machine. The printing cylinder according to the invention can also be used in an embossing printing machine. The structure and surface of the printing cylinder and its printing saddle are each adapted to the type of printing press. The hard or sufficiently rigid surface of the cover preferably corresponds to that of the printing 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 hineingedruckt und beschädigt wird. Auch im Falle einer sogenannten "gapless" Bogenoffsetdruckmaschine, bei der Plattenzylinder und Gummizylinder kontinuierlich geschlossene Umfangsflachen 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, there is the particular advantage that no additional means have to be provided which prevent the elastic screen printing stencil from being pressed into the cylinder pit of the printing cylinder and being damaged during the printing process by the doctor blade lying inside. Even in the case of a so-called "gapless" sheet-fed offset printing machine, in which the plate cylinder and blanket cylinder have continuously closed peripheral surfaces, a printing cylinder according to the invention with a closed peripheral surface during the printing process is very advantageous because it effectively prevents impacts and changes in the compressive stress between the blanket cylinder and the impression cylinder.
Zweckmassige Ausgestaltungen der Erfindung ergeben sich aus den abhangigen Ansprüchen.Appropriate embodiments of the invention result from the dependent claims.
Die Erfindung wird anhand der Zeichnung an einem Ausfuhrungsbeispiel naher erläutert.The invention is explained in more detail with reference to the drawing using an exemplary embodiment.
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.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.
Figur 2 zeigt die beiden Zylinder nach Figur 1 in derjenigen Stellung, in welcher die vollständig geschlossene Zylindergrube gerade den Druckspalt passiert hat.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 m 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 hindurchgefuhrt werden.In the illustration according to the figures, a pressure cylinder 1 according to the invention acts with a Screen printing cylinder 2 together, the circumference of which is formed by a cylindrical, elastic screen printing stencil 2a and the interior of which is indicated by the ink bead 2c accumulated by a doctor blade 2b. Both cylinders, which rotate in the direction of the arrows, form between them the printing nip through which the sheets B are passed by the printing cylinder 1 for the purpose of printing.
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 Drucksattel zur Aufnahme von zwei oder mehr Bogen haben, wobei alle Zylindergruben gleich ausgebildet sind.In the example considered, the pressure cylinder 1 has only one cylinder pit 3 and therefore only one pressure saddle for receiving an arc B. Of course, the pressure cylinder can also have two or more evenly distributed cylinder pits and pressure saddle for receiving two or more arcs, all of the cylinder pits being 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 drucken 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 around a gripper shaft 5 adjustable bow grippers 4 are mounted, which are adjustable in a known manner between an open position (FIG. 1) in which the gripper edges 4a project somewhat beyond the cylinder circumference and a closed position (FIG. 2) in which the grippers 4 do not protrude the circumference of the cylinder. In the closed position, the grippers 4, with their gripper edges 4a, print the front edge of a sheet B against a gripper support 6, which, starting from the circumferential surface of the printing cylinder, is inclined somewhat 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 Stellmechanismus besteht aus einem Steuerhebel in Form eines Winkelhebels 9, dessen eines Ende im Bereich der Welle 8 fest mit der Abdeckung 7 verbunden ist und dessen anderes Ende eine Nockenrolle 10 tragt, aus einer stationären Steuerkurve 11, welche bei Drehung des Druckzylinders 1 die Nockenrolle 10 und damit den Winkelhebel 9 mit der Abdeckung 7 fuhrt, und aus einer den Winkelhebel 9 mit seiner Nockenrolle 10 gegen den Umfang der Steuerkurve 11 druckenden Feder 12, die am rotierenden Druckzylinder 1 angebracht ist .The cylinder pit is also provided with an adjustable cover 7 which is adjustable about a shaft 8 between a closed position (FIG. 2) and an opening position partially releasing the cylinder pit (FIG. 1). The adjusting mechanism consists of a control lever in the form an angle lever 9, one end of which is fixedly connected to the cover 7 in the area of the shaft 8 and the other end of which carries a cam roller 10, from a stationary control cam 11 which, when the pressure cylinder 1 rotates, 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 circumference of the cam 11 printing spring 12 which is attached to the rotating pressure cylinder 1.
Die Steuerkurve 11 hat einen zur Achse des Druckzylinders 1 konzentrischen Umfangsbereich lla und zwei nach aussen vorspringende Umfangsbereiche, die sich jeweils in den Bereichen der Bogenubernahme zum Druckzylinder und der Bogenubergabe vom Druckzylinder befinden und von denen in den Figuren nur der nach aussen gewölbte Umfangsbereich Ilb im Bereich der Bogenubernahme zu sehen ist. Die Anordnung ist so getroffen, dass die Abdeckung 7 die Zylindergrube 3 vollständig schliesst, solange die Nockenrolle 10 auf dem Umfangsbereich lla der Steuerkurve 11 abrollt, und die Abdeckung 7 teilweise geöffnet wird, wenn die Nockenrolle 10 die nach aussen gewölbten Umfangsbereiche Ilb 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 cam 11 has a circumferential region 11a concentric to the axis of the printing cylinder 1 and two outwardly projecting circumferential regions, which are located in the areas of sheet transfer to the printing cylinder and the sheet transfer from the printing cylinder and of which in the figures only the outwardly curved circumferential region Ilb im Area of the sheet transfer can be seen. The arrangement is such that the cover 7 closes the cylinder pit 3 completely as long as the cam roller 10 rolls on the peripheral region 11a of the control cam 11, and the cover 7 is partially opened when the cam roller 10 moves the outwardly curved peripheral regions 11b of the control cam 11 happens. The cover 7 is thus opened by partially opening it in the side where the grippers 4 are arranged.
Die Abdeckung 7 ist genau so gekrümmt wie die Druckzylinderoberflache, so dass in ihrer Schliesstellung (Figur 2) der Druckzylinder 1 eine kontinuierlich geschlossene Oberflache hat. Ausserdem entspricht das Material der Abdeckung 7 dem Material der Druckzylinderoberflache und hat also die gleiche Harte wie diese ; im betrachteten Beispiel handelt es sich vorzugsweise um ein metallisches Material.The cover 7 is curved in exactly the same way as the printing cylinder surface, so that in its closed position (FIG. 2) the printing cylinder 1 has a continuously closed surface. In addition, the material of the cover 7 corresponds to the material of the printing cylinder surface and therefore has the same Hard like this; in the example considered, it 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 Druckzylinderoberflache möglichst nahtlos zu überbrücken, ist an der den Bogengreifern 4 abgewandten Seite der Zylindergrube 3, in Verlängerung der Zylmderumfangsflache, eine elastische Auflage 13 angebracht, an deren Unterseite ein etwas nach innen versetztes Endstuck 7a der Abdeckung 7 in der Schliesstellung anliegt, wie in Figur 2 gezeigt.In order to bridge the gap between the end of the cover 7 facing away from the sheet grippers 4 and the adjacent pressure cylinder surface as seamlessly as possible in the closed position of the cover, an elastic support 13 is attached to the side of the cylinder pit 3 facing away from the sheet grippers 4, as an extension of the circumferential surface of the cylinder. on the underside of which there is a somewhat inwardly displaced end piece 7a of the cover 7 in the closed position, as shown in FIG.
Die Abdeckung 7 wird also wahrend des Druckbetriebs wie folgt verstellt:The cover 7 is therefore adjusted as follows during the printing operation:
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 lla 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 Abstutzung für die gegen die Siebdruckschablone 2a druckende 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, which is to be transferred, for example, from the sheet grippers of a transfer cylinder, not shown, to the sheet grippers 4 in the cylinder pit 3 of the printing cylinder 1, the cover 7, as shown in FIG. 1, is partially opened so far that the sheet grippers 4 take their open position and the sheet grippers of the transfer cylinder, which hold the front edge of the sheet, can plunge sufficiently into the cylinder pit 3. As soon as the front edge of the incoming sheet has come under the gripper edges 4a of the sheet grippers 4, these grippers are adjusted to their closed position in a known manner, as a result of which the sheet edge released by the grippers of the transfer cylinder is clamped between the gripper edges 4a and the gripper support 6. As the pressure cylinder 1 continues to rotate, the cam roller 10 reaches the peripheral zone 11a of the control cam 11 and thereby causes the cover 7 to be closed, which completely covers the cylinder pit with the closed sheet grippers 4. The end of the cover 7 lying above the grippers 4 overlaps the leading edge of the sheet. In this closed position, the rigid cover 7 passes the printing nip (FIG. 2), serving as a fixed support for the squeegee 2b printing against the screen printing stencil 2a, so that the screen printing stencil cannot be damaged. It is therefore not necessary to lift the squeegee.
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 Bogenubergabe, auf dem nicht dargestellten, dem gewölbten Bereich Ilb der Steuerkurve 11 entprechenden gewölbten Bereich abrollt, nimmt die Abdeckung 7 wieder ihre Oeffnungsstellung ein, sodass die Bogengreifer 4 offnen und die Bogenkante freigeben können, welche von der den Bogen weitertransportierenden Transfervornchtung, insbesondere einem Transferzylinder mit Bogengreifern, übernommen wird.In the illustration according to FIG. 2, the closed cover 7 has just passed completely through the printing nip, and printing on the sheet B begins. As soon as the cam roller 10, in the area of the sheet transfer, then rolls on the not shown area corresponding to the curved area 11b of the control curve 11, the cover 7 returns to its open position, so that the sheet gripper 4 can open and release the sheet edge, which of the transfer device transporting the sheet further, in particular a transfer cylinder with sheet grippers, is taken over.
Im betrachteten Beispiel nimmt die Abdeckung 7 lediglich im Bereich der Bogenubernahme und der Bogenubergabe 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, wahrend eine Zylindergrube den Druckspalt passiert.In the example under consideration, the cover 7 assumes its opening position only in the area of the sheet transfer and the sheet transfer. However, the arrangement can also be made so that the opening position between the transfer of a printed sheet and the transfer of an incoming sheet 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 Pragedruckmaschinen, entfallt bei Verwendung eines Druckzylinders nach der Erfindung die Stossanregung beim Druckeinsatz, wodurch nicht nur eine Beeinträchtigung der Druckgualitat vermieden wird, sondern auch höhere Druckgeschwindigkeiten als bisher erzielt werden können.In other types of sheet-fed printing presses, such as offset printing and embossing printing presses, when using a printing cylinder according to the invention, the shock excitation is eliminated when printing, which not only avoids impairment of the printing quality, but also higher printing speeds than previously can be achieved.
Die Erfindung ist nicht auf das beschriebene Ausfuhrungsbeispiel beschrankt, sondern schliesst insbesondere hinsichtlich des Stellmechanismus mannigfache andere Möglichkeiten ein. The invention is not limited to the exemplary embodiment described, but includes various other possibilities, in particular with regard to the adjusting mechanism.

Claims

PATENTANSPRUECHE PATENT CLAIMS
1. Druckzylinder einer Bogendruckmaschine, der wenigstens eine Zylindergrube (3) aufweist, in der Bogengreifer (4) angeordnet sind, dadurch gekennzeichnet, dass die Bogengreifer (4) in ihrer Schliessstellung die Einhüllende der zylindrischen Umfangsfläche des Druckzylinders (1) nicht überragen und dass jede Zylindergrube (3) mit einer durch einen Stellmechanismus (9-12) verstellbaren Abdeckung (7) versehen ist, die in einer ersten Stellung die Zylindergrube (3) mit den in ihrer Schliessstellung befindlichen Greifern (4) vollständig abdeckt und die zylindrische Umfangsfläche des Druckzylinders (1) ergänzt und welche in einer zweiten Stellung die Zylindergrube (3) im Bereich der Greifer (4) wenigstens teilweise freigibt.1. Printing cylinder of a sheet-fed printing machine, which has at least one cylinder pit (3) in which sheet grippers (4) are arranged, characterized in that the sheet grippers (4) do not protrude beyond the envelope of the cylindrical peripheral surface of the printing cylinder (1) in their closed position and that Each cylinder pit (3) is provided with a cover (7) which can be adjusted by means of an adjusting mechanism (9-12), which in a first position completely covers the cylinder pit (3) with the grippers (4) in its closed position and the cylindrical peripheral surface of the Printing cylinder (1) added and which in a second position at least partially releases the cylinder pit (3) in the area of the grippers (4).
2. Druckzylinder nach Anspruch 1, dadurch gekennzeichnet, dass die Abdeckung (7) um eine in der Zylindergrube (3) angeordnete Welle (8) schwenkbar gelagert ist.2. Printing cylinder according to claim 1, characterized in that the cover (7) is pivotally mounted about a shaft (8) arranged in the cylinder pit (3).
3. Druckzylinder nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Abdeckung (7) in ihrer geschlossenen Stellung an der den Greifern (4) entgegengesetzten Seite der Zylindergrube (3) an einer elastischen Auflage (13) anliegt, welche den Spalt zwischen dem betreffenden Ende der Abdeckung (7) und der benachbarten Druckzylinderoberflache überbrückt.3. Printing cylinder according to claim 1 or 2, characterized in that the cover (7) in its closed position on the grippers (4) opposite side of the cylinder pit (3) rests on an elastic support (13) which covers the gap between the bridges the relevant end of the cover (7) and the adjacent surface of the impression cylinder.
4. Druckzylinder nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Stellmechanismus eine ortsfeste Steuerkurve (11) aufweist. 4. Printing cylinder according to one of claims 1 to 3, characterized in that the adjusting mechanism has a fixed control cam (11).
5. Druckzylinder nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Material der Abdeckung (7) dem der Druckzylinderoberfläche entspricht. 5. Printing cylinder according to one of claims 1 to 4, characterized in that the material of the cover (7) corresponds to that of the printing cylinder surface.
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
CH429/96 1996-02-19
CH42996 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

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

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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)
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WO (1) WO1997029912A1 (en)

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CN1211214A (en) 1999-03-17
AU1588197A (en) 1997-09-02
KR100438111B1 (en) 2004-07-16
JP2000504643A (en) 2000-04-18
JP4023629B2 (en) 2007-12-19
RU2170177C2 (en) 2001-07-10
EP0883493B1 (en) 1999-12-22
KR19990082466A (en) 1999-11-25
CA2241973A1 (en) 1997-08-21
CN1097511C (en) 2003-01-01
AU713139B2 (en) 1999-11-25
CA2241973C (en) 2004-12-07
US5960716A (en) 1999-10-05
ATE187928T1 (en) 2000-01-15
DE59700889D1 (en) 2000-01-27
UA53644C2 (en) 2003-02-17
WO1997029912A1 (en) 1997-08-21

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