EP0723864B1 - Rotary screen printing machine for sheet printing - Google Patents

Rotary screen printing machine for sheet printing Download PDF

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Publication number
EP0723864B1
EP0723864B1 EP96810043A EP96810043A EP0723864B1 EP 0723864 B1 EP0723864 B1 EP 0723864B1 EP 96810043 A EP96810043 A EP 96810043A EP 96810043 A EP96810043 A EP 96810043A EP 0723864 B1 EP0723864 B1 EP 0723864B1
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EP
European Patent Office
Prior art keywords
cylinder
screen printing
printing
pit
doctor
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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EP96810043A
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German (de)
French (fr)
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EP0723864A1 (en
Inventor
Johannes Georg Schaede
Hans Wyssmann
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KBA Notasys SA
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De la Rue Giori SA
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Publication of EP0723864A1 publication Critical patent/EP0723864A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0804—Machines for printing sheets
    • B41F15/0809—Machines for printing sheets with cylindrical or belt-like screens

Definitions

  • the invention relates to a rotary screen printing machine for sheetfed printing according to the generic term of claim 1.
  • Rotary screen printing machines work with one cylindrical, resilient screen printing stencil, the on the circumference of a forme cylinder is stretched and the inside is acted upon by a squeegee which is the one required for the printing process Bead builds up in front of the printing nip.
  • a squeegee which is the one required for the printing process Bead builds up in front of the printing nip.
  • the problem arises that when passing the screen printing template in a cylinder pit of the printing cylinder no support through this pressure cylinder learns which one for printing necessary squeegee pressure can absorb, so that Screen printing stencil pressed into the cylinder pit and can be damaged.
  • measures are provided such that the Passing the squeegee pressure in a cylinder pit Screen printing stencil not damaged and that at the same time the bead of color, which is necessary for printing is preserved.
  • a rotary screen printing machine in the preamble of claim 1 is described by the DE-A-39 03 721 known.
  • the pressure cylinder has no grippers; the bow will with the aid of conveyor roller pairs arranged near the pressure nip fed to the pressure nip.
  • the forme cylinder has a peripheral portion made of a mesh material and a screen printing stencil arranged above it, which with a along a generatrix of the Forme cylinder extending rail is attached.
  • the Impression cylinder has a cylinder pit adapted to this rail, so that this rail when passing the pressure gap can dip into this cylinder pit.
  • in the Inside the forme cylinder is one in the radial direction periodically adjustable doctor roll provided the inside of the mesh material and thus the screen printing template is present.
  • the distance between the Axes of the forme cylinder and the impression cylinder is like this chosen that it is slightly larger than the sum of the Radius of the impression cylinder and the radius of the Forme cylinder in the event that its screen printing template one concentric to the cylinder axis Takes position. Therefore, the impression cylinder and the Forme cylinder as long as the screen printing stencil is yours maintains a concentric position to the cylinder axis, one certain distance from each other that is a multiple of Bottom thickness is.
  • Doctor blade roll a radially outward pressure on the screen printing stencil so that this eccentrically curved outwards and thereby the Pressure gap is closed.
  • the screen printing stencil of the Forme cylinders must therefore periodically go out periodically deformed, which affects their lifespan and the achievable printing speed is obvious limited.
  • the object of the present invention is to achieve this to create a rotary screen printing machine in which the sheets in the usual way by grippers of the impression cylinder are transported and held and where the screen printing stencil as it passes a cylinder pit of the impression cylinder, while maintaining their cylindrical shape, from the pressure of the inner squeegee is relieved.
  • the screen printing machine according to the invention in sheet printing achieve normal printing speeds and any Eliminate the risk of damage to the screen printing stencil. Because to lift the squeegee from the screen printing stencil only a very small adjustment path is required is to relieve them of squeegee pressure, the bead of color necessary for printing remains before Pressure gap practically preserved. This guarantees that when lowering the squeegee onto the screen printing stencil after passing a cylinder pit the pressure after a very short run-up distance can. In addition, the adjustment mechanism stands out for the squeegee by constructive simplicity.
  • an adjustable partial cover of a cylinder pit of the impression cylinder and the ones inside Provide grippers This cover takes off before printing begins their cover position so that the squeegee of the Forme cylinders shortly before the point in time the gripper edge passes the pressure gap, lowered can be because the squeegee and the screen printing stencil experience support from this cover.
  • A is such a special design of the impression cylinder specified in dependent claim 7.
  • the rotary screen printing machine a forme cylinder 1 and an impression cylinder 2, which with the forme cylinder Printing gap forms the sheet B for printing pass through the forme cylinder 1.
  • the directions of rotation the cylinder is indicated by arrows.
  • the coat of the forme cylinder 1 consists only of one cylindrical, concentric to the cylinder axis Screen printing stencil 3, which is resilient and flexible on both sides of the forme cylinder 1 on ring flanges is attached.
  • these cylinder pits 4 are in Mounted adjustable on gripper shafts 20 in the usual way Bow gripper 5 housed, which with their Gripper edge the leading edge of a sheet B during its transport on the printing cylinder 2 and during the printing process ( Figure 1) by pressing against the Hold the gripper pad 21.
  • the grippers 5 are mounted that in its closed position it is printing Do not protrude the surface of the impression cylinder 2.
  • a doctor blade 6 is installed, which on the one hand the color inside the forme cylinder 1 directly before the printing nip to a colored bead F accumulates and on the other hand serves the screen printing stencil 3 against the inside during printing to press the pressure cylinder 2, that is against the lying on a printing zone of the printing cylinder 2 Sheet B ( Figure 1).
  • the squeegee 6 by a Control mechanism controlled, which in the considered Example a lever 7 in the form of an angle lever, a Control cam rotating in rotation with the forme cylinder 1 8 in the form of a cam disk and an actuating cylinder 9 having.
  • the lever 7 is in the middle, that is its angular corner, pivotable about a fixed axis 10 stored.
  • On the inside of the forme cylinder 1 the end of the lever 7, the squeegee 6 is attached, while the other end of the lever has a cam roller 11 carries, which cooperates with the control cam 8.
  • Lever 7 attacks the actuating cylinder 9 by one Fixed axis 12 is pivotally mounted and the Lever 7 with an adjustable force about the axis 10 counterclockwise according to Figure 1 to seeks to pivot, so that the squeegee 6 in the direction pressed onto the inside of the screen printing stencil 3 becomes.
  • the control cam 8 has a radially outward enlarged area 8a, the circumferential length of which Dimension of a cylinder pit 4 is adjusted.
  • This Area 8a of the control curve contains such a register arranged with the cylinder pits 4 and its radius is dimensioned such that whenever a cylinder pit 4 of the impression cylinder 2 the forme cylinder 1 happens, the doctor blade 6 by rolling the cam roller 11th on this area 8a pivoted inward and so from the screen printing stencil 3 is lifted off and separated ( Figure 2). The screen printing stencil 3 can on this Way not pressed into a cylinder pit 4 and to be damaged.
  • the radius of the remaining large circumferential section the control curve 8, outside the area 8a, is so small that the squeegee 6 under the effect of on the lever 7 pushing actuating cylinder 9 with predetermined force the screen printing stencil against one lying on a printing zone of the printing cylinder 2 Bow B presses ( Figure 1).
  • the doctor blade 6 is only subject to the force of the actuating cylinder 9, and the lever 7 with its cam roller 11 does not touch the control curve 8.
  • the adjustment of the Squeegee 6 in the separated from the screen printing stencil Position by the control curve 8 takes place against the effect of the actuating cylinder with constant force 9.
  • the measure described allows printing speeds which the in the sheet processing correspond to usual speeds. So that's it also possible the screen printing process with others Directly chain printing processes, so that personnel savings are possible without loss of production. So can in particular a screen printing machine according to the invention with another printing press, for example a downstream numbering machine or one downstream offset printing machine, combined in this way that are leaving the screen printing machine Arch through, without any interruptions appropriate transport system, especially a Chain gripper system, directly from the following printing machine are fed, which with the usual printing speed can be operated.
  • the lever 7 with provided a stop 16, behind which the pawl of Jack lever 14 in the last-mentioned position takes hold. In this blocking position, with the Squeegee 6, the lever 7 is always brought in when an interruption or at the end of printing of the Printing cylinder 2 is lifted from the forme cylinder 1.
  • a pivotable lever arm 22 is provided, the inner end around one near the pit floor below the gripper shaft 20 in the pressure cylinder 2 installed shaft 23 is pivotable and the other End is provided with a flat cover 24.
  • On the side facing the gripper shaft 20 has the Lever arm 22 adapted to this gripper shaft 20 Recess 25.
  • the gripper mechanism, the gripper pad 21 and in their closed position there with their gripper edge 5a resting gripper 5 are under the envelope of the printing cylinder surface lowered.
  • the arrangement is such that the Lever arm 22 between one completely inside the cylinder pit 4 lowered position ( Figure 4) and is pivotable in a position in which the cover 24 from the closed grippers 5 covers occupied area of the pit 4, in such a way that that the cylindrical peripheral surface of the one behind it Printing zone of the printing cylinder 2, on which an arch rests through the top of the cover 24 to about the middle of the cylinder pit 4 is extended ( Figure 3). So this cover 24 is executed so that they have space for the grippers 5 of the Printing cylinder 2 offers, this completely covers and with the subsequent printing segment of the printing cylinder 2 forms a closed surface.
  • the cylinder pit 4 becomes partially covered so that the squeegee 6 in the forme cylinder 1 can be lowered in front of the gripper edge 5a can and still receives support so that on the one hand, correct pressure is guaranteed and on the other hand, the screen printing stencil from being damaged is protected.
  • the cover 24 is so designed to fit seamlessly into the gripper edge Adjacent printing segment of the printing cylinder 2 passes over and the grippers 5 and the cylinder pit 4 with a Start-up curve via a screen printing process sufficiently long run-up distance to the pressure cylinder diameter can cover.
  • the control mechanism for the lever arm 22 with its cover 24 consists, for example, of a usual fixed cam disc or cam 28 and one that is under tension and unwinding Cam roller 26 at the end of one on the lever arm 22 attached arms 27 is mounted.
  • the control curve 28, which is only schematic in FIGS. 3 and 4 is indicated, is similar to the usual for Opening and closing of the gripper 5 serving control curve trained and designed so that during the Pressing the lever arm 22 with the cover 24 occupies the closed position shown in Figure 3.
  • Figures 5 and 6 is a schematic another embodiment of a screen printing machine of the invention, in which the cylinder pits, as described with reference to FIGS. 3 and 4, partially covered when passing the pressure gap and thereby the grippers in their closed position completely are covered.
  • the impression cylinder has 2 three, separated by three cylinder pits 4, 4 'and 4' ' Printing segments.
  • the adjusting mechanism for is of this type the squeegee 6 arranged differently, but consists in essentially from the figures 1 and 2 described parts, namely from the lever 7, which the squeegee 6 carries about the fixed axis 10 pivotable and is also provided with the cam roller 11 which rolls on the control curve 8 ', further from the 12th articulated actuator cylinder 9 through which Doctor blade 6 is subjected to a predetermined force, and from the only schematically indicated further adjusting mechanism 13 ', like parts 13, 14 and 15 after Figures 1 and 2, a blockage of the doctor blade 6 in allowed their off-hook position.
  • the control curve 8 ' has in the areas of the three cylinder pits 4, 4 ', 4' ' each have a radially projecting zone 8a 'through which the Cam roller 11 adjusted with the lever 7 and so the Squeegee 6 every time the open area of a cylinder pit passes the pressure gap, briefly from the Screen printing stencil 3 is lifted as shown in the Figures 1 and 2 described.
  • FIGs 5 and 6 are schematically a Sheets on the transfer cylinder 2 transfer cylinder 30 and the printed sheets from the impression cylinder 2 decreasing transfer cylinder 31 shown.
  • the arrangement is such that the cover 24, which when they pass the pressure gap their closed position takes, then, before reaching the Transfer cylinder 31, adjusted to its lowered position and will keep it until the other Transfer cylinder 30 has been passed. Subsequently, before reaching the pressure gap, the cover is then removed 24 closed again.
  • the control curve 28 a radially outwardly projecting zone 28a which cover the areas of the two transfer cylinders 30 and 31 includes and which ensures that, so long a cam roller 26 rolls on this zone 28a, the cover 24 in question is its lowered, open Takes position. Therefore, the grippers of the transfer cylinder 30 and 31 for handing over a sheet to the open gripper 5 of the pressure cylinder 2 or for takeover a sheet from the impression cylinder 2 in the relevant Intervene in cylinder pits.
  • the invention is not based on those described Embodiments of the adjusting mechanism for the squeegee 6 and the actuating mechanism for the cover 24 of the Printing cylinder 2 limited, but leaves manifold constructive variants too.

Abstract

The printing cylinder (2) has at least one groove and, with the form cylinder (1), forms the printing gap. A radially adjustable wiper (6) is installed near the printing gap. The printing cylinder in each groove has sheet grippers (5). The adjustable wiper has a control mechanism (7-9) so that the wiper is pressed against the inside of the screen printing stencil (3) during the printing process. The control mechanism has a pivot mounted lever (7) on one end of which the wiper is mounted and which is guided by a radial cam (8). The wiper is mechanically re-tensioned towards the stencil preferably by an adjusting cylinder (9).

Description

Die Erfindung bezieht sich auf eine Rotations-Siebdruckmaschine für den Bogendruck gemäss dem Oberbegriff des Anspruchs 1.The invention relates to a rotary screen printing machine for sheetfed printing according to the generic term of claim 1.

Bei schnellaufenden Bogendruckmaschinen werden die Bogen auf dem Druckzylinder mit Hilfe von Bogengreifern gehalten, welche in Zylindergruben des Druckzylinders untergebracht sind.With high-speed sheet-fed presses the sheets on the printing cylinder with the help of sheet grippers kept in cylinder pits of the impression cylinder are accommodated.

Rotations-Siebdruckmaschinen arbeiten mit einer zylindrischen, elastisch nachgiebigen Siebdruckschablone, die auf dem Umfang eines Formzylinders aufgespannt ist und die innen von einer Rakel beaufschlagt wird, welche den für den Druckvorgang erforderlichen Farbwulst vor dem Druckspalt anhäuft. Hierbei stellt sich das Problem, dass beim Passieren einer Zylindergrube des Druckzylinders die Siebdruckschablone durch diesen Druckzylinder keine Unterstützung erfährt, welche den für das Drucken notwendigen Rakeldruck aufnehmen kann, so dass die Siebdruckschablone in die Zylindergrube hineingedrückt wird und dadurch beschädigt werden kann. Es müssen daher Massnahmen derart vorgesehen werden, dass beim Passieren einer Zylindergrube der Rakeldruck die Siebdruckschablone nicht beschädigt und dass gleichzeitig der Farbwulst, welcher für das Drucken notwendig ist, erhalten bleibt.Rotary screen printing machines work with one cylindrical, resilient screen printing stencil, the on the circumference of a forme cylinder is stretched and the inside is acted upon by a squeegee which is the one required for the printing process Bead builds up in front of the printing nip. Here the problem arises that when passing the screen printing template in a cylinder pit of the printing cylinder no support through this pressure cylinder learns which one for printing necessary squeegee pressure can absorb, so that Screen printing stencil pressed into the cylinder pit and can be damaged. To have to therefore measures are provided such that the Passing the squeegee pressure in a cylinder pit Screen printing stencil not damaged and that at the same time the bead of color, which is necessary for printing is preserved.

Eine Rotations-Siebdruckmaschine der im Oberbegriff des Anspruchs 1 beschriebenen Art ist durch die DE-A-39 03 721 bekannt. Bei dieser Bogendruckmaschine hat der Druckzylinder keine Greifer; die Bogen werden mit Hilfe von in Druckspaltnähe angeordneten Förderrollenpaaren dem Druckspalt zugeführt. Der Formzylinder hat einen aus einem Netzmaterial bestehenden Umfangsabschnitt und eine darüber angeordnete Siebdruckschablone, welche mit einer sich längs einer Erzeugenden des Formzylinders erstreckenden Schiene befestigt ist. Der Druckzylinder hat eine dieser Schiene angepasste Zylindergrube, damit diese Schiene beim Passieren des Druckspalts in diese Zylindergrube eintauchen kann. Im Innern des Formzylinders ist eine in radialer Richtung periodisch verstellbare Rakelrolle vorgesehen, die an der Innenseite des Netzmaterials und damit der Siebdruckschablone anliegt. Der Abstand zwischen den Achsen des Formzylinders und des Druckzylinders ist so gewählt, dass er etwas grösser ist als die Summe des Radius des Druckzylinders und des Radius des Formzylinders für den Fall, dass dessen Siebdruckschablone eine zur Zylinderachse konzentrische Lage einnimmt. Daher haben der Druckzylinder und der Formzylinder, solange die Siebdruckschablone ihre konzentrische Lage zur Zylinderachse beibehält, einen bestimmten Abstand voneinander, der ein Mehrfaches der Bodendicke beträgt. Beim Druckvorgang übt die innere Rakelrolle einen radial nach aussen gerichteten Druck auf die Siebdruckschablone aus, so dass diese exzentrisch nach aussen gewölbt und dadurch der Druckspalt geschlossen wird. Die Siebdruckschablone des Formzylinders muss also ständig periodisch nach aussen verformt werden, was ihre Lebensdauer beeinträchtigt und die erzielbare Druckgeschwindigkeit offensichtlich begrenzt.A rotary screen printing machine in the preamble of claim 1 is described by the DE-A-39 03 721 known. With this sheet printing machine the pressure cylinder has no grippers; the bow will with the aid of conveyor roller pairs arranged near the pressure nip fed to the pressure nip. The forme cylinder has a peripheral portion made of a mesh material and a screen printing stencil arranged above it, which with a along a generatrix of the Forme cylinder extending rail is attached. Of the Impression cylinder has a cylinder pit adapted to this rail, so that this rail when passing the pressure gap can dip into this cylinder pit. in the Inside the forme cylinder is one in the radial direction periodically adjustable doctor roll provided the inside of the mesh material and thus the screen printing template is present. The distance between the Axes of the forme cylinder and the impression cylinder is like this chosen that it is slightly larger than the sum of the Radius of the impression cylinder and the radius of the Forme cylinder in the event that its screen printing template one concentric to the cylinder axis Takes position. Therefore, the impression cylinder and the Forme cylinder as long as the screen printing stencil is yours maintains a concentric position to the cylinder axis, one certain distance from each other that is a multiple of Bottom thickness is. The inner one practices during the printing process Doctor blade roll a radially outward pressure on the screen printing stencil so that this eccentrically curved outwards and thereby the Pressure gap is closed. The screen printing stencil of the Forme cylinders must therefore periodically go out periodically deformed, which affects their lifespan and the achievable printing speed is obvious limited.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Rotations-Siebdruckmaschine zu schaffen, bei welcher die Bogen in üblicher Weise durch Greifer des Druckzylinders transportiert und gehalten werden und bei welcher die Siebdruckschablone beim Passieren einer Zylindergrube des Druckzylinders, unter Beibehaltung ihrer zylindrischen Gestalt, vom Druck der inneren Rakel entlastet ist. The object of the present invention is to achieve this to create a rotary screen printing machine in which the sheets in the usual way by grippers of the impression cylinder are transported and held and where the screen printing stencil as it passes a cylinder pit of the impression cylinder, while maintaining their cylindrical shape, from the pressure of the inner squeegee is relieved.

Diese Aufgabe wird erfindungsgemäss durch die im kennzeichnenden Teil das Anspruchs 1 angegebenen Merkmale gelöst.This object is achieved by the im characterizing part of claim 1 specified features solved.

Auf diese Weise lassen sich mit der Siebdruckmaschine nach der Erfindung die beim Bogendruck üblichen Druckgeschwindigkeiten erzielen und jegliche Gefahr einer Beschädigung der Siebdruckschablone ausschliessen. Da zur Abhebung der Rakel von der Siebdruckschablone nur ein sehr kleiner Verstellweg erforderlich ist, um diese vom Rakeldruck zu entlasten, bleibt der für das Drucken notwendige Farbwulst vor dem Druckspalt praktisch erhalten. Damit ist garantiert, dass beim Absenken der Rakel auf die Siebdruckschablone nach dem Passieren einer Zylindergrube der Druck nach einer nur sehr kurzen Anlaufstrecke wieder einsetzen kann. Ausserdem zeichnet sich der Verstellmechanismus für die Rakel durch konstruktive Einfachheit aus.In this way, the screen printing machine according to the invention in sheet printing achieve normal printing speeds and any Eliminate the risk of damage to the screen printing stencil. Because to lift the squeegee from the screen printing stencil only a very small adjustment path is required is to relieve them of squeegee pressure, the bead of color necessary for printing remains before Pressure gap practically preserved. This guarantees that when lowering the squeegee onto the screen printing stencil after passing a cylinder pit the pressure after a very short run-up distance can. In addition, the adjustment mechanism stands out for the squeegee by constructive simplicity.

Wenn in speziellen Fällen der Druckbeginn sehr nahe an der Bogenvorderkante liegt, ist es vorteilhaft, eine verstellbare teilweise Abdeckung einer Zylindergrube des Druckzylinders und der darin befindlichen Greifer vorzusehen. Vor Druckbeginn nimmt diese Abdeckung ihre Abdeckstellung ein, so dass die Rakel des Formzylinders bereits kurz vor dem Zeitpunkt, an dem die Greiferkante den Druckspalt passiert, abgesenkt werden kann, da die Rakel und die Siebdruckschablone eine Abstützung durch diese Abdeckung erfahren. Eine derartige besondere Ausbildung des Druckzylinders ist im abhängigen Anspruch 7 angegeben. Durch eine solche Abdeckung der Zylindergrube und der Greifer wird also der Zylindermantel in Drehrichtung des Zylinders vollständig ergänzt, so dass im Bereich der Greifer keinerlei Löcher oder Kanten vorhanden sind, an denen das Sieb oder die abgesenkte Rakel beschädigt werden könnte. If in special cases the start of printing very much is close to the leading edge of the sheet, it is advantageous an adjustable partial cover of a cylinder pit of the impression cylinder and the ones inside Provide grippers. This cover takes off before printing begins their cover position so that the squeegee of the Forme cylinders shortly before the point in time the gripper edge passes the pressure gap, lowered can be because the squeegee and the screen printing stencil experience support from this cover. A is such a special design of the impression cylinder specified in dependent claim 7. By such Coverage of the cylinder pit and the gripper is thus the cylinder jacket completely in the direction of rotation of the cylinder added so that in the area of the gripper there are no holes or edges on which the sieve or the lowered doctor blade are damaged could.

Zweckmässige weitere Ausgestaltungen der Erfindung ergeben sich aus den übrigen abhängigen Ansprüchen.Appropriate further refinements of the invention result from the other dependent claims.

Die Erfindung wird anhand der Zeichnungen an Ausführungsbeispielen näher erläutert. Es zeigen:

  • Figur 1 die schematische Darstellung eines Ausführungsbeispiels einer Siebdruckmaschine nach der Erfindung, und zwar während der Bedruckung eines Bogens,
  • Figur 2 dieselbe Maschine in derjenigen Stellung der Zylinder, in welcher gerade eine Zylindergrube des Druckzylinders den Formzylinder passiert,
  • Figur 3 den vergrössert dargestellten Bereich einer Zylindergrube eines speziell ausgebildeten Druckzylinders einer zweiten Ausführungsform unmittelbar vor Beginn eines Druckvorgangs, mit einer verstellbaren Abdeckung der Zylindergrube, die in der Darstellung nach Figur 3 teilweise überdeckt ist,
  • Figur 4 die gleiche Anordnung wie in Figur 3, wobei jedoch die Abdeckung ihre ins Innere der Zylindergrube versenkte Ruhestellung einnimmt, und
  • Figuren 5 und 6 eine schematisch dargestellte dritte Ausführungsform einer Siebdruckmaschine, in zwei verschiedenen Stellungen.
    • The invention is explained in more detail with reference to the drawings of exemplary embodiments. Show it:
  • FIG. 1 shows a schematic representation of an embodiment of a screen printing machine according to the invention, specifically while printing on a sheet,
  • FIG. 2 shows the same machine in the position of the cylinders in which a cylinder pit of the impression cylinder is passing the forme cylinder,
  • 3 shows the enlarged area of a cylinder pit of a specially designed printing cylinder of a second embodiment immediately before the start of a printing process, with an adjustable cover of the cylinder pit, which is partially covered in the illustration according to FIG. 3,
  • FIG. 4 shows the same arrangement as in FIG. 3, but the cover assumes its rest position sunk into the interior of the cylinder pit, and
  • Figures 5 and 6 a schematically illustrated third embodiment of a screen printing machine, in two different positions.

    • Nach den Figuren 1 und 2 weist die Rotations-Siebdruckmaschine einen Formzylinder 1 und einen Druckzylinder 2 auf, welcher mit dem Formzylinder einen Druckspalt bildet, den die Bogen B zwecks Bedruckung durch den Formzylinder 1 passieren. Die Drehrichtungen der Zylinder sind durch Pfeile angedeutet. Der Mantel des Formzylinders 1 besteht lediglich aus einer zylindrischen, konzentrisch zur Zylinderachse liegenden Siebdruckschablone 3, welche elastisch nachgiebig und an beiden Seiten des Formzylinders 1 an Ringflanschen befestigt ist. According to Figures 1 and 2, the rotary screen printing machine a forme cylinder 1 and an impression cylinder 2, which with the forme cylinder Printing gap forms the sheet B for printing pass through the forme cylinder 1. The directions of rotation the cylinder is indicated by arrows. The coat of the forme cylinder 1 consists only of one cylindrical, concentric to the cylinder axis Screen printing stencil 3, which is resilient and flexible on both sides of the forme cylinder 1 on ring flanges is attached.

    Im betrachteten Ausführungsbeispiel ist der Durchmesser des Druckzylinders 2 doppelt so gross wie der des Formzylinders 1. Daher weist der Druckzylinder 2 zwei je einen Bogen B aufnehmende Drucksegmente auf, welche durch diametral gegenüberliegende Zylindergruben 4 getrennt sind. In diesen Zylindergruben 4 sind die in üblicher Weise auf Greiferwellen 20 verstellbar montierten Bogengreifer 5 untergebracht, welche mit ihrer Greiferkante die Vorderkante eines Bogens B während seines Transports auf dem Druckzylinder 2 und während des Druckvorgangs (Figur 1) durch Anpressung gegen die Greiferauflage 21 halten. Die Greifer 5 sind so montiert, dass sie in ihrer Schliessstellung die druckende Oberfläche des Druckzylinders 2 nicht überragen.In the exemplary embodiment under consideration, the Diameter of the impression cylinder 2 twice as large that of the forme cylinder 1. Therefore, the impression cylinder 2 two printing segments each receiving a sheet B, which by diametrically opposite cylinder pits 4 are separated. In these cylinder pits 4 are in Mounted adjustable on gripper shafts 20 in the usual way Bow gripper 5 housed, which with their Gripper edge the leading edge of a sheet B during its transport on the printing cylinder 2 and during the printing process (Figure 1) by pressing against the Hold the gripper pad 21. The grippers 5 are mounted that in its closed position it is printing Do not protrude the surface of the impression cylinder 2.

    Im Innern des Formzylinders 1, im Bereich vor dem Druckspalt, ist eine Rakel 6 installiert, welche einerseits die Farbe im Innern des Formzylinders 1 unmittelbar vor dem Druckspalt zu einem Farbwulst F anhäuft und andererseits dazu dient, die Siebdruckschablone 3 während des Druckvorgangs von innen gegen den Druckzylinder 2 zu drücken, das heisst gegen den auf einer Druckzone des Druckzylinders 2 liegenden Bogen B (Figur 1). Da jedoch beim Passieren einer Zylindergrube 4 die elastische Siebdruckschablone 3 durch den Druckzylinder 2 keine Abstützung erfährt, welche den für das Drucken notwendigen Rakeldruck aufnehmen kann und somit die Siebdruckschablone durch Eindrücken in die Zylindergrube zerstört würde, wird die Rakel 6 beim Passieren einer Zylindergrube 4 so weit von der Siebdruckschablone 3 abgehoben, dass der Rakeldruck die Siebdruckschablone nicht beschädigt, dabei aber der Farbwulst F, welcher für das Drucken notwendig ist, erhalten bleibt. Inside the forme cylinder 1, in the area in front the printing nip, a doctor blade 6 is installed, which on the one hand the color inside the forme cylinder 1 directly before the printing nip to a colored bead F accumulates and on the other hand serves the screen printing stencil 3 against the inside during printing to press the pressure cylinder 2, that is against the lying on a printing zone of the printing cylinder 2 Sheet B (Figure 1). However, when passing one Cylinder pit 4 the elastic screen printing template 3 is not supported by the pressure cylinder 2, which is the squeegee printing necessary for printing can accommodate and thus through the screen printing stencil Pushing into the cylinder pit would be destroyed the squeegee 6 when passing through a cylinder pit 4 so far removed from the screen printing stencil 3 that the Squeegee does not damage the screen printing stencil, but the color bead F, which for printing is necessary is preserved.

    Zu diesem Zwecke wird die Rakel 6 durch einen Stellmechanismus gesteuert, welcher im betrachteten Beispiel einen Hebel 7 in Form eines Winkelhebels, eine drehfest mit dem Formzylinder 1 rotierende Steuerkurve 8 in Form einer Nockenscheibe und einen Stellzylinder 9 aufweist. Der Hebel 7 ist in der Mitte, das heisst an seiner Winkelecke, um eine ortsfeste Achse 10 schwenkbar gelagert. An dem im Innern des Formzylinders 1 liegenden Ende des Hebels 7 ist die Rakel 6 befestigt, während das andere Ende des Hebels eine Nockenrolle 11 trägt, welche mit der Steuerkurve 8 zusammenwirkt. In der Nähe des die Nockenrolle 11 tragenden Endes des Hebels 7 greift der Stellzylinder 9 an, der um eine ortsfeste Achse 12 schwenkbar gelagert ist und den Hebel 7 mit einer einstellbaren Kraft um die Achse 10 entgegengesetzt zum Uhrzeigersinne nach Figur 1 zu schwenken sucht, so dass also die Rakel 6 in Richtung auf die Innenseite der Siebdruckschablone 3 gedrückt wird. Die Steuerkurve 8 hat einen radial nach aussen erweiterten Bereich 8a, dessen Umfangslänge der Abmessung einer Zylindergrube 4 angepasst ist. Dieser Bereich 8a der Steuerkurve ist derart registerhaltig mit den Zylindergruben 4 angeordnet und sein Radius ist derart bemessen, dass immer dann, wenn eine Zylindergrube 4 des Druckzylinders 2 den Formzylinder 1 passiert, die Rakel 6 durch Abrollen der Nockenrolle 11 auf diesem Bereich 8a nach innen verschwenkt und so von der Siebdruckschablone 3 abgehoben und getrennt wird (Figur 2). Die Siebdruckschablone 3 kann auf diese Weise nicht in eine Zylindergrube 4 hineingedrückt und beschädigt werden. For this purpose, the squeegee 6 by a Control mechanism controlled, which in the considered Example a lever 7 in the form of an angle lever, a Control cam rotating in rotation with the forme cylinder 1 8 in the form of a cam disk and an actuating cylinder 9 having. The lever 7 is in the middle, that is its angular corner, pivotable about a fixed axis 10 stored. On the inside of the forme cylinder 1 the end of the lever 7, the squeegee 6 is attached, while the other end of the lever has a cam roller 11 carries, which cooperates with the control cam 8. In close to the end of the cam roller 11 Lever 7 attacks the actuating cylinder 9 by one Fixed axis 12 is pivotally mounted and the Lever 7 with an adjustable force about the axis 10 counterclockwise according to Figure 1 to seeks to pivot, so that the squeegee 6 in the direction pressed onto the inside of the screen printing stencil 3 becomes. The control cam 8 has a radially outward enlarged area 8a, the circumferential length of which Dimension of a cylinder pit 4 is adjusted. This Area 8a of the control curve contains such a register arranged with the cylinder pits 4 and its radius is dimensioned such that whenever a cylinder pit 4 of the impression cylinder 2 the forme cylinder 1 happens, the doctor blade 6 by rolling the cam roller 11th on this area 8a pivoted inward and so from the screen printing stencil 3 is lifted off and separated (Figure 2). The screen printing stencil 3 can on this Way not pressed into a cylinder pit 4 and to be damaged.

    Der Radius des übrigen grossen Umfangsabschnitts der Steuerkurve 8, ausserhalb des Bereichs 8a, ist so klein bemessen, dass die Rakel 6 unter der Wirkung des auf den Hebel 7 drückenden Stellzylinders 9 mit vorbestimmter Kraft die Siebdruckschablone gegen einen auf einer Druckzone des Druckzylinders 2 liegenden Bogen B drückt (Figur 1). Während des Druckvorgangs unterliegt also die Rakel 6 nur der Kraft des Stellzylinders 9, und der Hebel 7 mit seiner Nockenrolle 11 berührt die Steuerkurve 8 nicht. Die Verstellung der Rakel 6 in die von der Siebdruckschablone getrennte Lage durch die Steuerkurve 8 erfolgt gegen die Wirkung des mit konstanter Kraft beaufschlagten Stellzylinders 9.The radius of the remaining large circumferential section the control curve 8, outside the area 8a, is so small that the squeegee 6 under the effect of on the lever 7 pushing actuating cylinder 9 with predetermined force the screen printing stencil against one lying on a printing zone of the printing cylinder 2 Bow B presses (Figure 1). During printing the doctor blade 6 is only subject to the force of the actuating cylinder 9, and the lever 7 with its cam roller 11 does not touch the control curve 8. The adjustment of the Squeegee 6 in the separated from the screen printing stencil Position by the control curve 8 takes place against the effect of the actuating cylinder with constant force 9.

    Um den für das Drucken erforderlichen Farbwulst F während der Abhebung der Rakel 6 so weit wie möglich beizubehalten, wird die Rakel nur geringfügig um eine kleine Strecke abgehoben, die zum Beispiel typischerweise grössenordnungsmässig 1 mm betragen kann und ausreicht, um die Siebdruckschablone vom Rakeldruck zu entlasten. Damit ist gewährleistet, dass beim Absenken der Rakel 6 auf die Siebdruckschablone 3 nach dem Passieren einer Zylindergrube der Druck nach einer sehr kurzen Anlaufstrecke wieder einsetzen kann und der Farbwulst praktisch erhalten bleibt oder rasch wieder vervollständigt wird.Around the color bead required for printing F while lifting the squeegee 6 as far as possible maintain the squeegee only slightly by one small distance lifted, which for example typically can be of the order of 1 mm and sufficient to remove the screen printing stencil from squeegee printing relieve. This ensures that when lowering the squeegee 6 on the screen printing stencil 3 after Passing a cylinder pit the pressure after a very short start-up distance and the Bead remains practically intact or quickly is completed.

    Die beschriebene Massnahme erlaubt Druckgeschwindigkeiten, welche den bei der Bogenverarbeitung üblichen Geschwindigkeiten entsprechen. Damit ist es auch möglich, das Siebdruckverfahren mit anderen Druckverfahren direkt zu verketten, so dass Personaleinsparungen ohne Produktionseinbusse möglich sind. So kann insbesondere eine Siebdruckmaschine nach der Erfindung mit einer anderen Druckmaschine, beispielsweise einer nachgeschalteten Numeriermaschine oder einer nachgeschalteten Offsetdruckmaschine, derart kombiniert werden, dass die die Siebdruckmaschine verlassenden Bogen, ohne irgendwelche Unterbrechungen, durch ein entsprechendes Transportsystem, insbesondere ein Kettengreifersystem, direkt der folgenden Druckmaschine zugeführt werden, welche mit der üblichen Druckgeschwindigkeit betrieben werden kann.The measure described allows printing speeds which the in the sheet processing correspond to usual speeds. So that's it also possible the screen printing process with others Directly chain printing processes, so that personnel savings are possible without loss of production. So can in particular a screen printing machine according to the invention with another printing press, for example a downstream numbering machine or one downstream offset printing machine, combined in this way that are leaving the screen printing machine Arch through, without any interruptions appropriate transport system, especially a Chain gripper system, directly from the following printing machine are fed, which with the usual printing speed can be operated.

    Im betrachteten Beispiel nach den Figuren 1 und 2 ist ein weiterer Stellmechanismus mit einem Stellzylinder 13 und einem Klinkenhebel 14 vorgesehen, der vom Stellzylinder 13 um eine ortsfeste Achse 15 zwischen zwei Stellungen verschwenkbar ist. In der einen, in den Figuren 1 und 2 dargestellten Stellung des Klinkenhebels 14 ist dieser vom Hebel 7 getrennt und hat keinerlei Einfluss auf die Funktion dieses Hebels 7. In der anderen Stellung ist der Klinkenhebel 14 entgegengesetzt zum Uhrzeigersinne in der Darstellung nach den Figuren so weit verschwenkt, dass seine am Ende angebrachte Klinke hinter das die Nockenrolle 11 tragende Ende des Hebels 7 greift und diesen Hebel 7 in einer unwirksamen Stellung derart ständig blockiert, dass die Rakel 6 ins Innere des Formzylinders 1 verschwenkt und von der Siebdruckschablone 3 abgehoben ist. Zu diesem Zwecke ist der Hebel 7 mit einem Anschlag 16 versehen, hinter den die Klinke des Klinkenhebels 14 in der zuletzt erwähnten Stellung greift. In diese Blockierungsstellung, mit abgehobener Rakel 6, wird der Hebel 7 immer dann gebracht, wenn bei einer Unterbrechung oder am Ende des Druckbetriebs der Druckzylinder 2 vom Formzylinder 1 abgehoben wird.In the considered example according to Figures 1 and 2 is another actuator mechanism with an actuator cylinder 13 and a ratchet lever 14 provided from the actuating cylinder 13 about a fixed axis 15 is pivotable between two positions. In the a position shown in Figures 1 and 2 of the ratchet lever 14, this is separated from the lever 7 and has no influence on the function of this Lever 7. In the other position is the ratchet lever 14 counterclockwise in the illustration according to the figures pivoted so far that his pawl attached at the end behind that the cam roller 11 supporting end of the lever 7 and this engages Lever 7 constantly in an inactive position blocks the squeegee 6 inside the forme cylinder 1 pivoted and from the screen printing template 3 is lifted off. For this purpose, the lever 7 with provided a stop 16, behind which the pawl of Jack lever 14 in the last-mentioned position takes hold. In this blocking position, with the Squeegee 6, the lever 7 is always brought in when an interruption or at the end of printing of the Printing cylinder 2 is lifted from the forme cylinder 1.

    In besonderen Fällen, in denen der Druckbeginn sehr nahe an der Bogenvorderkante anfängt, kann es vorkommen, dass das Absenken der Rakel auf die Innenseite der Siebdruckschablone zu spät erfolgt und somit kein vollständiger Druck stattfindet. Um das zu vermeiden, kann der Druckzylinder im Bereich seiner Zylindergrube bzw. seiner Zylindergruben mit einer verstellbaren Abdeckung ausgerüstet sein, welche den kritischen Bereich der Zylindergrube bei Druckbeginn über den geschlossenen Bogengreifern abdeckt und sowohl eine zylindrische Anlaufstrecke für die Siebdruckschablone beim Druckprozess bildet als auch Platz für die Greifer bietet. Eine derartige Ausführungsform eines Druckzylinders ist in den Figuren 3 und 4 dargestellt.In special cases where the start of printing starts very close to the leading edge of the sheet, it can happen that lowering the squeegee to the inside the screen printing stencil is too late and therefore no full pressure takes place. To avoid that, can the impression cylinder in the area of its cylinder pit or its cylinder pits with an adjustable cover be equipped which the critical area the cylinder pit at the start of printing over the closed one Grabs and both one cylindrical run-up section for the screen printing stencil forms space for the grippers during the printing process as well offers. Such an embodiment of a printing cylinder is shown in Figures 3 and 4.

    In einer Zylindergrube 4 des Druckzylinders 2 ist ausser den auf der Greiferwelle 20 sitzenden Greifern 5 ein schwenkbarer Hebelarm 22 vorgesehen, dessen inneres Ende um eine in der Nähe des Grubenbodens unterhalb der Greiferwelle 20 im Druckzylinder 2 installierte Welle 23 schwenkbar ist und dessen anderes Ende mit einer flachen Abdeckung 24 versehen ist. An der der Greiferwelle 20 zugewandten Seite hat der Hebelarm 22 eine dieser Greiferwelle 20 angepasste Ausnehmung 25. Der Greifermechanismus, die Greiferauflage 21 und die in ihrer Schliessstellung dort mit ihrer Greiferkante 5a aufliegenden Greifer 5 sind unter die Einhüllende der druckenden Druckzylinderoberfläche abgesenkt. Die Anordnung ist so getroffen, dass der Hebelarm 22 zwischen einer vollständig in das Innere der Zylindergrube 4 versenkten Stellung (Figur 4) und einer Stellung verschwenkbar ist, in welcher die Abdeckung 24 den von den geschlossenen Greifern 5 eingenommenen Bereich der Grube 4 abdeckt, und zwar so, dass die zylindrische Umfangsfläche der dahinterliegenden Druckzone des Druckzylinders 2, auf welcher ein Bogen aufliegt, durch die Oberseite der Abdeckung 24 bis etwa zur Mitte der Zylindergrube 4 hin verlängert wird (Figur 3). Diese Abdeckung 24 ist also so ausgeführt, dass sie Platz für die Greifer 5 des Druckzylinders 2 bietet, diese vollständig abdeckt und mit dem anschliessenden Drucksegment des Druckzylinders 2 eine geschlossene Oberfläche bildet.In a cylinder pit 4 of the impression cylinder 2 is in addition to the grippers seated on the gripper shaft 20 5, a pivotable lever arm 22 is provided, the inner end around one near the pit floor below the gripper shaft 20 in the pressure cylinder 2 installed shaft 23 is pivotable and the other End is provided with a flat cover 24. On the side facing the gripper shaft 20 has the Lever arm 22 adapted to this gripper shaft 20 Recess 25. The gripper mechanism, the gripper pad 21 and in their closed position there with their gripper edge 5a resting gripper 5 are under the envelope of the printing cylinder surface lowered. The arrangement is such that the Lever arm 22 between one completely inside the cylinder pit 4 lowered position (Figure 4) and is pivotable in a position in which the cover 24 from the closed grippers 5 covers occupied area of the pit 4, in such a way that that the cylindrical peripheral surface of the one behind it Printing zone of the printing cylinder 2, on which an arch rests through the top of the cover 24 to about the middle of the cylinder pit 4 is extended (Figure 3). So this cover 24 is executed so that they have space for the grippers 5 of the Printing cylinder 2 offers, this completely covers and with the subsequent printing segment of the printing cylinder 2 forms a closed surface.

    Wie Figur 3 zeigt, wird also die Zylindergrube 4 teilweise so abgedeckt, dass die Rakel 6 im Formzylinder 1 vor der Greiferkante 5a abgesenkt werden kann und trotzdem eine Abstützung erfährt, so dass einerseits ein korrekter Druck gewährleistet ist und andererseits die Siebdruckschablone vor einer Beschädigung geschützt wird. Die Abdeckung 24 ist also so gestaltet, dass sie nahtlos in das der Greiferkante benachbarte Drucksegment des Druckzylinders 2 übergeht und die Greifer 5 sowie die Zylindergrube 4 mit einer Anlaufkurve über eine dem Siebdruckprozess angepasste genügend lange Anlaufstrecke auf Druckzylinderdurchmesser abdecken kann.As FIG. 3 shows, the cylinder pit 4 becomes partially covered so that the squeegee 6 in the forme cylinder 1 can be lowered in front of the gripper edge 5a can and still receives support so that on the one hand, correct pressure is guaranteed and on the other hand, the screen printing stencil from being damaged is protected. The cover 24 is so designed to fit seamlessly into the gripper edge Adjacent printing segment of the printing cylinder 2 passes over and the grippers 5 and the cylinder pit 4 with a Start-up curve via a screen printing process sufficiently long run-up distance to the pressure cylinder diameter can cover.

    Der Steuermechanismus für den Hebelarm 22 mit seiner Abdeckung 24 besteht beispielsweise aus einer üblichen ortsfesten Nockenscheibe oder Steuerkurve 28 und einer daran unter Vorspannung anliegenden und abrollenden Nockenrolle 26, die am Ende eines am Hebelarm 22 befestigten Arms 27 gelagert ist. Die Steuerkurve 28, die nur schematisch in den Figuren 3 und 4 angedeutet ist, ist ähnlich wie die übliche, zum Oeffnen und Schliessen der Greifer 5 dienenden Steuerkurve ausgebildet und so gestaltet, dass während des Druckeinsatzes der Hebelarm 22 mit der Abdeckung 24 die in Figur 3 gezeigte geschlossene Stellung einnimmt. Bevor die Greifer 5 zur Uebergabe eines Bogens an einen Transferzylinder geöffnet werden bzw. einen Bogen von einem Transferzylinder übernehmen, wird der Hebelarm 22 mit der Abdeckung 24 durch die Steuerkurve 28 ins Innere der Zylindergrube 4 in die in Figur 4 gezeigte Stellung verschwenkt, damit die Gegengreifer des betreffenden Transferzylinders in die Zylindergrube des Druckzylinders 2 eintauchen können. Diese Stellung, in der die Nockenrolle 26 auf dem radial vorstehenden Bereich 28a der Steuerkurve 28 abrollt und der Hebelarm 22 an einem Anschlag 29 anliegt, wird so lange beibehalten, bis nach Weiterdrehung des Druckzylinders 2 die Greifer 5 einen neuen Bogen vom betreffenden Transferzylinder übernommen und ihre Schliessstellung eingenommen haben.The control mechanism for the lever arm 22 with its cover 24 consists, for example, of a usual fixed cam disc or cam 28 and one that is under tension and unwinding Cam roller 26 at the end of one on the lever arm 22 attached arms 27 is mounted. The control curve 28, which is only schematic in FIGS. 3 and 4 is indicated, is similar to the usual for Opening and closing of the gripper 5 serving control curve trained and designed so that during the Pressing the lever arm 22 with the cover 24 occupies the closed position shown in Figure 3. Before the gripper 5 for transferring a sheet to one Transfer cylinders are opened or an arc of take over a transfer cylinder, the lever arm 22 with the cover 24 through the control curve 28 ins Interior of the cylinder pit 4 in that shown in Figure 4 Position pivoted so that the counter-gripper of the concerned transfer cylinder in the cylinder pit of the Can immerse printing cylinder 2. This position, in which the cam roller 26 on the radially protruding Area 28a of the control cam 28 rolls and the lever arm 22 abuts a stop 29 is maintained as long as until after further rotation of the printing cylinder 2 the gripper 5 a new sheet from the concerned Transfer cylinder taken over and their closed position have taken.

    In der versenkten Stellung der Abdeckung 24 reicht also der frei zugängliche Raum der Zylindergrube aus, damit die Gegengreifer des den Bogen zuführenden und des den Bogen abführenden Transferzylinders in die Zylindergrube 4 eintauchen können.In the lowered position of the cover 24 the freely accessible space of the cylinder pit is sufficient so that the counter-grippers of the one feeding the sheet and the transfer cylinder removing the sheet into the Can dip cylinder pit 4.

    Während einer vollen Umdrehung des Druckzylinders 2 finden also, ausgehend von der in Figur 3 gezeigten Druckstellung, folgende Verstellungen statt: Nachdem die Zylindergrube den Formzylinder 1 passiert hat, wird durch die Steuerkurve 28 der Hebel 22 mit der Abdeckung 24 in die abgesenkte Stellung (Figur 4) verschwenkt, bevor die Greifer 5 den den Bogen übernehmenden Transferzylinder erreichen; bei Uebergabe des Bogens an diesen Transferzylinder werden die Greifer 5 in die Oeffnungsstellung verstellt (Figur 4), in der sie so lange bleiben, bis sie nach entsprechender Weiterdrehung des Druckzylinders 2 den die Bogen zuführenden Transferzylinder erreichen; dann werden die Greifer 5 zum Halten des neuen Bogens geschlossen, und anschliessend wird der Hebelarm 22 mit der Abdeckung 24 wieder in die in Figur 3 dargestellte Druckstellung verstellt, bevor der Bogen den Druckspalt erreicht.During one full revolution of the impression cylinder So find 2, starting from that in Figure 3 shown print position, the following adjustments take place: After the cylinder pit passes the forme cylinder 1 has, by the control curve 28, the lever 22 with the Cover 24 pivoted into the lowered position (FIG. 4), before the grippers 5 take over the bow Reach transfer cylinder; upon delivery of the The grippers 5 become the arc on this transfer cylinder adjusted to the open position (Figure 4), in the they stay until they are done Continued rotation of the impression cylinder 2 to feed the sheets Reach transfer cylinder; then the Gripper 5 closed to hold the new sheet, and then the lever arm 22 with the cover 24 again in the printing position shown in Figure 3 adjusted before the sheet reaches the printing nip.

    Während die zwischen der vorderen Kante der Zylindergrube 4 und der geschlossenen Abdeckung 24 gebildete Unterbrechung den Formzylinder 1 passiert, wird die Rakel 6 im Formzylinder 1 zur Entlastung der Siebdruckschablone 3 nach innen verschwenkt; sobald sich der in Drehrichtung vordere Bereich der Abdeckung 24 im Druckspalt befindet, wird die Rakel 6 wieder auf die Siebdruckschablone 3 abgesenkt, so dass sich ein stabiler Farbwulst bis zum Druckeinsatz auf dem Drucksegment des Druckzylinders 2 ausbilden kann.While the between the front edge of the Cylinder pit 4 and the closed cover 24 formed interruption passes the forme cylinder 1, the doctor blade 6 in the forme cylinder 1 to relieve the Screen printing template 3 swung inwards; as soon as the front of the cover in the direction of rotation 24 is in the printing nip, the squeegee 6 again the screen printing stencil 3 lowered so that a stable bead of ink until printing is started on the printing segment of the printing cylinder 2 can form.

    In den Figuren 5 und 6 ist schematisch eine weitere Ausführungsform einer Siebdruckmaschine nach der Erfindung dargestellt, bei welcher die Zylindergruben, wie anhand der Figuren 3 und 4 beschrieben, beim Passieren des Druckspalts teilweise abgedeckt und dadurch die Greifer in ihrer Schliessstellung völlig überdeckt sind. Bei diesem Beispiel hat der Druckzylinder 2 drei, durch drei Zylindergruben 4, 4' und 4'' getrennte Drucksegmente.In Figures 5 and 6 is a schematic another embodiment of a screen printing machine of the invention, in which the cylinder pits, as described with reference to FIGS. 3 and 4, partially covered when passing the pressure gap and thereby the grippers in their closed position completely are covered. In this example, the impression cylinder has 2 three, separated by three cylinder pits 4, 4 'and 4' ' Printing segments.

    Der Hauptunterschied zum Ausführungsbeispiel nach den Figuren 1 und 2 besteht jedoch darin, dass die Steuerkurve 8', welche das Abheben der Rakel 6 von der Innenseite der Siebdruckschablone 3 während des Passierens einer Zylindergrube 4 steuert, seitlich drehfest am Druckzylinder 2 befestigt ist und mit diesem umläuft. Dadurch wird vorteilhafterweise der Formzylinder vom Gewicht dieser Steuerkurve entlastet. Entsprechend dieser Bauart ist der Stellmechanismus für die Rakel 6 anders angeordnet, besteht jedoch im wesentlichen aus den anhand der Figuren 1 und 2 beschriebenen Teilen, nämlich aus dem Hebel 7, welcher die Rakel 6 trägt, um die ortsfeste Achse 10 schwenkbar und ausserdem mit der Nockenrolle 11 versehen ist, die auf der Steuerkurve 8' abrollt, ferner aus dem bei 12 gelenkig gelagerten Stellzylinder 9, durch den die Rakel 6 mit vorgebbarer Kraft beaufschlagt wird, und aus dem nur schematisch angedeuteten weiteren Stellmechanismus 13', der, wie die Teile 13, 14 und 15 nach den Figuren 1 und 2, eine Blockierung der Rakel 6 in ihrer abgehobenen Stellung erlaubt. Die Steuerkurve 8' hat in den Bereichen der drei Zylindergruben 4, 4', 4'' je eine radial vorstehende Zone 8a', durch die die Nockenrolle 11 mit dem Hebel 7 verstellt und so die Rakel 6 jedesmal, wenn der offene Bereich einer Zylindergrube den Druckspalt passiert, kurzzeitig von der Siebdruckschablone 3 abgehoben wird, wie anhand der Figuren 1 und 2 beschrieben.The main difference from the embodiment according to Figures 1 and 2, however, is that the Control curve 8 ', the lifting of the squeegee 6 from the Inside of the screen printing template 3 during the Passing a cylinder pit 4 controls, laterally is rotatably attached to the pressure cylinder 2 and with this circulates. As a result, the Forme cylinder relieved of the weight of this cam. The adjusting mechanism for is of this type the squeegee 6 arranged differently, but consists in essentially from the figures 1 and 2 described parts, namely from the lever 7, which the squeegee 6 carries about the fixed axis 10 pivotable and is also provided with the cam roller 11 which rolls on the control curve 8 ', further from the 12th articulated actuator cylinder 9 through which Doctor blade 6 is subjected to a predetermined force, and from the only schematically indicated further adjusting mechanism 13 ', like parts 13, 14 and 15 after Figures 1 and 2, a blockage of the doctor blade 6 in allowed their off-hook position. The control curve 8 ' has in the areas of the three cylinder pits 4, 4 ', 4' ' each have a radially projecting zone 8a 'through which the Cam roller 11 adjusted with the lever 7 and so the Squeegee 6 every time the open area of a cylinder pit passes the pressure gap, briefly from the Screen printing stencil 3 is lifted as shown in the Figures 1 and 2 described.

    In jeder Zylindergrube 4, 4', 4'' sind, wie im Beispiel nach den Figuren 3 und 4, um eine Greiferwelle 20 verstellbare Bogengreifer 5, eine Greiferauflage und eine Abdeckung 24 montiert, die an einem Hebelarm 22 befestigt ist; dieser Hebelarm 22 ist um die Welle 23 schwenkbar und trägt wiederum eine Nockenrolle 26, die unter mechanischer Vorspannung an einer ortsfesten Steuerkurve 28 anliegt und abrollt.In each cylinder pit 4, 4 ', 4' 'are, as in Example according to Figures 3 and 4, around a gripper shaft 20 adjustable bow grippers 5, a gripper pad and a cover 24 is mounted on a lever arm 22 is attached; this lever arm 22 is around the shaft 23 pivotable and in turn carries a cam roller 26, the under mechanical preload on a stationary Control curve 28 abuts and rolls.

    In den Figuren 5 und 6 sind schematisch ein die Bögen auf den Druckzylinder 2 übergebender Transferzylinder 30 und ein die bedruckten Bögen vom Druckzylinder 2 abnehmender Transferzylinder 31 dargestellt. Die Anordnung ist so getroffen, dass die Abdeckung 24, welche beim Passieren des Druckspalts ihre Schliessstellung einnimmt, anschliessend, vor Erreichen des Transferzylinders 31, in ihre abgesenkte Lage verstellt wird und diese so lange beibehält, bis der andere Transferzylinder 30 passiert worden ist. Anschliessend, vor Erreichen des Druckspalts, wird dann die Abdeckung 24 erneut geschlossen. Dementsprechend hat die Steuerkurve 28 eine radial nach aussen vorspringende Zone 28a, welche die Bereiche der beiden Transferzylinder 30 und 31 einschliesst und welche dafür sorgt, dass, so lange eine Nockenrolle 26 auf dieser Zone 28a abrollt, die betreffende Abdeckung 24 ihre abgesenkte, offene Stellung einnimmt. Daher können die Greifer der Transferzylinder 30 und 31 zur Uebergabe eines Bogens an die offenen Greifer 5 des Druckzylinders 2 bzw. zur Uebernahme eines Bogens vom Druckzylinder 2 in die betreffenden Zylindergruben eingreifen.In Figures 5 and 6 are schematically a Sheets on the transfer cylinder 2 transfer cylinder 30 and the printed sheets from the impression cylinder 2 decreasing transfer cylinder 31 shown. The arrangement is such that the cover 24, which when they pass the pressure gap their closed position takes, then, before reaching the Transfer cylinder 31, adjusted to its lowered position and will keep it until the other Transfer cylinder 30 has been passed. Subsequently, before reaching the pressure gap, the cover is then removed 24 closed again. Accordingly, the control curve 28 a radially outwardly projecting zone 28a, which cover the areas of the two transfer cylinders 30 and 31 includes and which ensures that, so long a cam roller 26 rolls on this zone 28a, the cover 24 in question is its lowered, open Takes position. Therefore, the grippers of the transfer cylinder 30 and 31 for handing over a sheet to the open gripper 5 of the pressure cylinder 2 or for takeover a sheet from the impression cylinder 2 in the relevant Intervene in cylinder pits.

    In der Darstellung nach Figur 5 hat die Zylindergrube 4 gerade den Bereich des Druckspalts passiert und ist noch teilweise durch die Abdeckung 24 abgedeckt, während sich die Abdeckung 24 in der Zylindergrube 4' in der abgesenkten Stellung und die Abdeckung 24 in der Zylindergrube 4'', nach Passierendes Transferzylinders 30, in der geschlossenen Stellung befindet. Die Rakel 6 nimmt noch ihre von der Siebdruckschablone 3 abgehobene Stellung ein. In der Darstellung nach Figur 6 hat sich der Druckzylinder 2 im Sinne des Pfeils etwas weitergedreht, und die Abdeckung 24 der Zylindergrube 4, die nun den Transferzylinder 31 passiert, hat sich in der Zwischenzeit abgesenkt, während sich die Stellung der Abdeckung in den beiden anderen Zylindergruben 4' und 4'' nicht geändert hat; die Rakel 6 nimmt wieder ihre an der Siebdruckschablone 3 anliegende Stellung ein.5 has the Cylinder pit 4 just the area of the pressure gap happened and is still partially through cover 24 covered while the cover 24 in the Cylinder pit 4 'in the lowered position and the Cover 24 in the cylinder pit 4 '' after passing Transfer cylinder 30, in the closed Position. The squeegee 6 still takes her from the Screen printing template 3 lifted off position. In the 6, the pressure cylinder 2 turned a little further in the direction of the arrow, and the Cover 24 of the cylinder pit 4, which is now the Transfer cylinder 31 has happened in the Meanwhile lowered while the position of the Cover in the other two cylinder pits 4 'and 4 '' has not changed; the squeegee 6 takes her again on the screen printing stencil 3.

    Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele des Stellmechanismus für die Rakel 6 und des Stellmechanismus für die Abdeckung 24 des Druckzylinders 2 beschränkt, sondern lässt mannigfache konstruktive Varianten zu.The invention is not based on those described Embodiments of the adjusting mechanism for the squeegee 6 and the actuating mechanism for the cover 24 of the Printing cylinder 2 limited, but leaves manifold constructive variants too.

    Claims (10)

    1. A rotary screen printing machine for sheet printing, with a form cylinder (1) which carries a screen printing stencil (3), with an impression cylinder (2) which has at least one cylinder pit (4) and which forms the printing nip with the form cylinder (1), and with a doctor (6) which can be adjusted radially inside the form cylinder (1) and which is installed in the region of the printing nip and pressed against the inside of the screen printing stencil (3) during a printing operation, characterised in that the impression cylinder (2) is provided, in each cylinder pit (4), with sheet grippers (5) which, in their closing position, do not project above the printing surface of the impression cylinder, and wherein the adjustable doctor (6) and an actuating mechanism (7,8,9) controlling this doctor are designed for adjusting said doctor into a position of rest lifted off from the inside of the screen printing stencil (3) when the open region of a cylinder pit (4) of the impression cylinder (2) passes the region of the printing nip.
    2. The screen printing machine as claimed in claim 1, characterised in that the actuating mechanism has a pivotably mounted lever (7), on the one end of which the doctor (6) is mounted and which is guided by a control cam (8,8') rotating simultaneously with the form cylinder (1), and wherein the doctor (6) is prestressed mechanically in the direction of the screen printing stencil (3), preferably by an actuating cylinder (9).
    3. The screen printing machine as claimed in claim 2, characterised in that the control cam (8) is connected to the form cylinder (1) fixedly in terms of relative rotation.
    4. The screen printing machine as claimed in claim 2, characterised in that the control cam (8') is connected to the impression cylinder (2) fixedly in terms of relative rotation.
    5. The screen printing machine as claimed in one of claims 1 to 4, characterised in that there is provided a further actuating mechanism (13,14;13') which is designed, during a rotation of the form cylinder (1), to hold said doctor (6) constantly in its position of rest lifted off from the screen printing stencil (3).
    6. The screen printing machine as claimed in one of claims 1 to 5, characterised in that, in the position of rest, the doctor (6) is lifted off from the screen printing stencil (3) by an order of magnitude of only 1 mm.
    7. The screen printing machine as claimed in one of claims 1 to 6, characterised in that each cylinder pit (4,4',4'') of the impression cylinder (2) can be covered partially by an adjustable covering (24) which, in the covering position, completely covers the closed sheet grippers (5) and which continuously extends that cylindrical circumferential surface of the impression cylinder (2) located in front of the cylinder pit in the cylinder direction of rotation, and wherein this covering (24) can be adjusted by means of an actuating mechanism (22,26,27,28) between a covering position during the passage of the form cylinder (1) and a position lowered into the interior of the cylinder pit (4).
    8. The screen printing machine as claimed in claim 7, characterised in that the actuating mechanism for the covering (24) has a fixed control cam (28).
    9. The screen printing machine as claimed in claim 7 or 8, characterised in that, during printing operation, even before the gripper edges (5a) holding the sheet arrive at the printing nip, the doctor (6) can be pressed out of its position of rest against the screen printing stencil (3) which, at the same time, is supported by the covering (24).
    10. The screen printing machine as claimed in one of claims 1 to 9, characterised in that the casing of the form cylinder (1) consists solely of the elastically flexible screen printing stencil (3) which is fastened to annular flanges provided on both sides of the form cylinder (1).
    EP96810043A 1995-01-24 1996-01-23 Rotary screen printing machine for sheet printing Expired - Lifetime EP0723864B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    CH19295 1995-01-24
    CH192/95 1995-01-24

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    EP0723864B1 true EP0723864B1 (en) 1998-08-19

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    US (1) US5671671A (en)
    EP (1) EP0723864B1 (en)
    JP (2) JP3708608B2 (en)
    CN (1) CN1063391C (en)
    AT (1) ATE169867T1 (en)
    AU (1) AU696709B2 (en)
    CA (1) CA2167765C (en)
    DE (1) DE59600440D1 (en)
    RU (1) RU2145548C1 (en)
    UA (1) UA41371C2 (en)

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    US6412407B1 (en) 1997-10-14 2002-07-02 Gallus Ferd Ruesch Ag Screen printing installation
    US6681690B2 (en) 2000-01-25 2004-01-27 Koenig & Bauer Aktiengesellschaft Sheet-fed printing press with screen-printing cylinder
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    Also Published As

    Publication number Publication date
    JP3708608B2 (en) 2005-10-19
    UA41371C2 (en) 2001-09-17
    JPH08230149A (en) 1996-09-10
    CA2167765A1 (en) 1996-07-25
    AU4204196A (en) 1996-08-01
    CN1063391C (en) 2001-03-21
    EP0723864A1 (en) 1996-07-31
    RU2145548C1 (en) 2000-02-20
    US5671671A (en) 1997-09-30
    ATE169867T1 (en) 1998-09-15
    CN1136497A (en) 1996-11-27
    AU696709B2 (en) 1998-09-17
    CA2167765C (en) 2008-09-16
    JP2005219509A (en) 2005-08-18
    DE59600440D1 (en) 1998-09-24

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