EP1375144A2 - Device for powdering sheets in a printing machine - Google Patents

Device for powdering sheets in a printing machine Download PDF

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Publication number
EP1375144A2
EP1375144A2 EP03008407A EP03008407A EP1375144A2 EP 1375144 A2 EP1375144 A2 EP 1375144A2 EP 03008407 A EP03008407 A EP 03008407A EP 03008407 A EP03008407 A EP 03008407A EP 1375144 A2 EP1375144 A2 EP 1375144A2
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EP
European Patent Office
Prior art keywords
powder
cylinder
printing
pressure cylinder
sheet
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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
EP03008407A
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German (de)
French (fr)
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EP1375144B1 (en
EP1375144A3 (en
Inventor
Albrecht Bolza-Schünemann
Tilo Steinborn
Volker Taschenberger
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Koenig and Bauer AG
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Koenig and Bauer AG
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Publication of EP1375144A2 publication Critical patent/EP1375144A2/en
Publication of EP1375144A3 publication Critical patent/EP1375144A3/en
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Publication of EP1375144B1 publication Critical patent/EP1375144B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F23/00Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/06Powdering devices, e.g. for preventing set-off

Definitions

  • the invention relates to an arrangement for powdering flat structures in a printing press and to create a separating layer between them, after the last paint application powder can be applied to the printed side of the fabric by means of a powder device is, and in the region of the sheet-guiding lateral surface of the printing cylinder, the powder device is arranged, and in the region of the non-curved surface of the printing cylinder a suction device is arranged.
  • powder in powder form based on starch or calcium Use powder in powder form based on starch or calcium.
  • the powder is applied using a powder pressure sprayer applied between the fabrics to be deposited, so that a distance between the fabrics when stacked on top of each other.
  • a device for applying powder on the Print carrier on offset rotary machines with at least one, a plate cylinder, one Rubber cylinders and a printing unit having a printing cylinder are known.
  • the powder device is the impression cylinder of the last one and / or - if there are several impression cylinders are possibly also assigned to a printing cylinder preceding the last printing cylinder.
  • the powder application device can work with an application roller or as a spray device be trained.
  • the pressure cylinder is included in the area of the non-curved surface Powder coated, so that the powder first on the outer surface of the printing cylinder and from this is applied to the back of the substrate. Only when it is placed on the The delivery stack thus fulfills its function.
  • a disadvantage of this device is that the powder is only indirectly via the pressure cylinder and reaches the printed image via the back of the sheet. This is an exact dosage of the required powder is not possible.
  • the sheet with the powder must travel a long way until the powder is effective becomes. With this device, an early influence of the powder on the printed is Side of the arch is not guaranteed.
  • the powder adheres to the paint only after the fabric has been deposited on the Stack. This means that a lot of powder is lost on the way from the impression cylinder to the delivery stack. The powder that has been lost must be suctioned off and the delivery also becomes dirty.
  • DE 44 45 457 describes a method and a printing press for applying a spacer material on a printed sheet.
  • a spacer fabric is used, which among other things with water and a water-soluble adhesive mixed and also applied directly to the sheet lying on the impression cylinder can. This spacer fabric forms a non-scraping separating layer between the sheets.
  • a disadvantage of this arrangement is that the housing surrounding the powder device is not can effectively prevent the strong swirling of the powder at high machine speed Residues of this, for example, in the pressure gap between the blanket cylinder and pressure cylinder arrive.
  • This object is achieved with an arrangement of the type mentioned, in which between the position of the last paint application / paint application and the powder device at least that adjacent printing unit shielding air curtain is set up.
  • this air curtain which is in the area of the sheet-guiding outer surface of the printing cylinder is set up between the powder device and the printing nip in the printing unit and in Axial direction of the printing cylinder can, in addition to that in the powder device according to state-of-the-art facilities, effective the penetration of swirled Powder in the printing unit can be avoided, since this is an area between the powder device and the printing unit and the area behind the powder device shields.
  • the powder device itself can essentially be the powder device according to the prior art Technique according to which the powder is applied to the fabric by means of spray nozzles becomes.
  • Suction nozzles are preferably provided on both sides of the spray nozzles should vacuum up the dusted / swirled powder, but due to strong air currents / air vortices, especially at high machine speeds caused by sheet transport themselves as well as caused by the spray and suction nozzles cannot be avoided that powder remains get into the vicinity of the adjacent printing / laughing unit.
  • the air curtain prevents which is preferably formed across the width of the printing cylinder to the side walls, the passage of powder through it and thus at least shields the adjacent one Printing / varnishing unit against the unwanted penetration of powder.
  • the suction device which is in the Area of the non-sheet-leading outer surface of the printing cylinder is arranged, at least a brush acting on the impression cylinder is arranged.
  • the air curtain prevents the sheet-guiding surface the penetration of powder into the printing unit and the other during the powdering process, brushes on the pressure cylinder simultaneously attack the loosen and brush off any adhering powder residues, thus for the suction device release and be suctioned off and discharged from it.
  • are two brushes or two rows of brushes arranged axially to the impression cylinder are provided, each with a brush / row of brushes on one side of the suction device, which also extends in the axial direction to the pressure cylinder, is formed.
  • the air curtain is formed by a blowing device, by means of which the pressure cylinder is acted upon by a blast air stream aligned with it becomes.
  • the air curtain is in terms of air pressure, air temperature and its angle of impact formed on the pressure cylinder such that an air exchange and thus an exchange of Particles contained in the air are avoided or prevented through the air curtain.
  • the blowing device extends and thus also the air curtain across the entire width of the impression cylinder. This can be done side by side arranged individual air nozzles take place or by means of a, a long air gap having device from which the blown air emerges. According to a preferred embodiment However, the air curtain extends beyond the width of the impression cylinder to Side walls and thus reliably prevents air turbulence on the side of the printing unit penetrate into the same.
  • the suction device has a funnel-shaped Inlet, which is aligned with its large opening on the impression cylinder and extends along the entire width of the impression cylinder.
  • the suction device with your at the inlet opening facing the pressure cylinder extends along its axial Length and thus forms a channel-shaped channel. With this shape the brushed can be Catch, vacuum and remove residual powder particularly well.
  • the brushes are directly on the suction device arranged and brushing along the entire printing cylinder.
  • the suction device thus forms on the non-sheet-guiding surface area together with the brushes, which are preferably arranged on both sides of the trigger device, a single one Assembly.
  • the figure shows a schematic representation of the printing cylinder 3 that preceded the printing cylinder 3 Sheet guiding cylinder 4 and the chain deflection wheel arranged downstream of the impression cylinder 3 5th
  • Sheet guide cylinder 4, impression cylinder 3 and the chain guide wheel 5 have a double size Diameter on.
  • the rubber and plate cylinders assigned to the printing cylinder 3 6.7 have a single-large diameter.
  • the device can also be used with a different machine configuration, for example when printing and sheet guiding cylinders 3.4 have a single-large diameter.
  • the impression cylinder 3 has the common tangent point T 1 with the rubber cylinder 6 and the common tangent point T 2 with the chain deflection wheel 5.
  • the powder device 10 is arranged between the tangent points T 1 , T 2 , specifically on the arc-guiding lateral surface of the printing cylinder 3.
  • the powder device 10 has the following structure:
  • a housing 12 On a crossbar 11, a housing 12 is attached, which over the width of the printing cylinder 3 and on both ends of the printing cylinder 3 under the periphery of the outer surface of the printing cylinder 3 is enough.
  • the spray nozzle 16 of the powder device 10 is assigned centrally to the housing 12.
  • One suction nozzle 13 is arranged upstream and downstream of the spray nozzle 16.
  • the suction nozzle 13 and the spray nozzle 16 are via supply lines, not shown, with suction air or
  • the housing 12 is designed in such a way that it is the powder device 10 essentially seals.
  • the air curtain 17, also referred to as a blowing sword, is set up;
  • This air curtain 17 is generated by a blowing device 18, which extends essentially over the entire axial length of the pressure cylinder 3 or beyond.
  • the blowing device 18 generates an air flow directed towards the pressure cylinder 3, the air curtain 17, which protects the pressure gap at the tangent point T 1 and the printing unit as a whole from soiling, that is, from the penetration of powder from the powder device 10 and of powder particles which are caused by air turbulence in the environment around the powder device 10 are shielded.
  • the powder is powder in powder form, which forms a dusty separating layer between the flat structures.
  • a further suction nozzle 19 is provided on the non-arc-guiding surface of the printing cylinder 3 (after the tangent point T 2 ).
  • Brushes 14 are formed on both sides of the suction opening of the suction nozzle 19 and also extend along the pressure cylinder 3. The brushes 14 attack the printing cylinder 3 while the machine is running and remove the powder residues adhering to it, which are collected and sucked off by the suction nozzle 19.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The powdering device (10) applies powder to the printed side of a flat picture. It is fitted in the region of the sheet-guide surface of the printing cylinder (3). there is a suction device (19) on the other surface of the cylinder. An air curtain (17) to protect at least the adjacent parts of the printing mechanism is fitted between the position of the last ink or lacquer application and the powdering device.

Description

Die Erfindung betrifft eine Anordnung zum Pudern von Flächengebilden in einer Druckmaschine und zum Erzeugen einer Trennschicht zwischen denselben, bei der nach dem letzten Farbauftrag mittels einer Pudereinrichtung Puder auf die bedruckte Seite des Flächengebildes auftragbar ist, und bei der im Bereich der bogenführenden Mantelfläche des Druckzylinders die Pudereinrichtung angeordnet ist, und im Bereich der nichtbogenführenden Mantelfläche des Druckzylinders eine Absaugeinrichtung angeordnet ist.The invention relates to an arrangement for powdering flat structures in a printing press and to create a separating layer between them, after the last paint application powder can be applied to the printed side of the fabric by means of a powder device is, and in the region of the sheet-guiding lateral surface of the printing cylinder, the powder device is arranged, and in the region of the non-curved surface of the printing cylinder a suction device is arranged.

Es ist bekannt, zur Vermeidung des Ablegens von Farbe der frisch bedruckten Flächengebilde Puder in Pulverform auf Stärke- oder Kalziumbasis einzusetzen. Das Puder wird mittels Puderdruckbestäuber zwischen den abzulegenden Flächengebilden aufgebracht, so dass ein Abstand zwischen den Flächengebilden bei deren Übereinanderstapeln entsteht.It is known to avoid discarding the color of the freshly printed fabrics Use powder in powder form based on starch or calcium. The powder is applied using a powder pressure sprayer applied between the fabrics to be deposited, so that a distance between the fabrics when stacked on top of each other.

Es ist weiterhin bekannt, Puder auf Flächengebilde im Bogenausleger aufzubringen. Dies hat den Nachteil, dass das Flächengebilde nur von den Greifern an der Vorderkante gehalten werden kann, ansonsten aber frei geführt wird und eine exakte gleichmäßige Beschichtung mit Puder nicht möglich ist. Außerdem müssen für die Anordnung zum Pudern die umlaufenden Greiferwagen berücksichtigt werden. Die Greiferwagen verursachen Verwirbelungen der Luft und damit auch des Puders und die rücklaufenden Greiferwagen nehmen Puder mit, das sich bis ins Druckwerk festsetzt. Eine Puderabsaugung mindert zwar die Verschmutzung in der Druckmaschine, aber kann diese nicht ganz vermeiden.It is also known to apply powder to fabrics in the sheet delivery. this has the disadvantage that the fabric is only held by the grippers on the front edge can, but otherwise is guided freely and an exact even coating with powder not possible. In addition, the rotating gripper carts must be used for the powdering arrangement be taken into account. The gripper carts cause turbulence in the air and with it also the powder and the returning gripper carriages take powder that can be Printing unit sticks. A powder suction reduces the pollution in the printing press, but cannot completely avoid them.

Aus der Druckschrift DE-OS 21 51 185 ist eine Vorrichtung zum Aufbringen von Puder auf dem Druckträger an Offset-Rotationsmaschinen mit wenigstens einem, einen Plattenzylinder, einen Gummizylinder und einen Druckzylinder aufweisenden Druckwerk bekannt. Die Pudereinrichtung ist dabei dem Druckzylinder des letzten und/oder - wenn mehrere Druckzylinder vorhanden sind - eventuell auch einem dem letzten Druckzylinder vorangestellten Druckzylinder zugeordnet.From the document DE-OS 21 51 185 a device for applying powder on the Print carrier on offset rotary machines with at least one, a plate cylinder, one Rubber cylinders and a printing unit having a printing cylinder are known. The powder device is the impression cylinder of the last one and / or - if there are several impression cylinders are possibly also assigned to a printing cylinder preceding the last printing cylinder.

Die Puderauftragsvorrichtung kann mit einer Auftragwalze arbeiten oder als Sprüheinrichtung ausgebildet sein. Dabei wird der Druckzylinder im Bereich der bogenfreien Mantelfläche mit Puder beschichtet, so dass das Puder zuerst auf die Mantelfläche des Druckzylinders und von dieser auf die Rückseite des Bedruckstoffes aufgetragen wird. Erst mit seiner Ablage auf dem Auslagestapel erfüllt das Puder somit seine Funktion. The powder application device can work with an application roller or as a spray device be trained. The pressure cylinder is included in the area of the non-curved surface Powder coated, so that the powder first on the outer surface of the printing cylinder and from this is applied to the back of the substrate. Only when it is placed on the The delivery stack thus fulfills its function.

Nachteilig an dieser Einrichtung ist, dass das Puder nur auf indirektem Wege über den Druckzylinder und über die Bogenrückseite auf das bedruckte Bild gelangt. Damit ist eine exakte Dosierung des benötigten Puders nicht möglich.A disadvantage of this device is that the powder is only indirectly via the pressure cylinder and reaches the printed image via the back of the sheet. This is an exact dosage of the required powder is not possible.

Außerdem muss der Bogen mit dem Puder einen weiten Weg zurücklegen, bis das Puder wirksam wird. Mit dieser Einrichtung ist somit ein frühes Einwirken des Puders auf die bedruckte Seite des Bogens nicht gewährleistet.In addition, the sheet with the powder must travel a long way until the powder is effective becomes. With this device, an early influence of the powder on the printed is Side of the arch is not guaranteed.

Außerdem haftet das Puder an der Farbe erst nach dem Ablegen des Flächengebildes auf den Stapel. Somit geht viel Puder auf dem Weg vom Druckzylinder bis zum Auslagestapel verloren. Das verlorengegangene Puder muss abgesaugt werden, außerdem verschmutzt die Auslage.In addition, the powder adheres to the paint only after the fabric has been deposited on the Stack. This means that a lot of powder is lost on the way from the impression cylinder to the delivery stack. The powder that has been lost must be suctioned off and the delivery also becomes dirty.

Durch die DE 44 45 457 sind ein Verfahren und eine Druckmaschine zum Aufbringen eines Abstandsstoffes auf einen Druckbogen bekannt geworden.DE 44 45 457 describes a method and a printing press for applying a spacer material on a printed sheet.

Dabei wird ein Abstandsstoff verwendet, der u.a. mit Wasser und einem wasserlöslichen Kleber vermischt und auch direkt auf den auf dem Druckzylinder liegenden Bogen aufgebracht werden kann. Dieser Abstandsstoff bildet zwischen den Bogen eine nichtschabende Trennschicht.A spacer fabric is used, which among other things with water and a water-soluble adhesive mixed and also applied directly to the sheet lying on the impression cylinder can. This spacer fabric forms a non-scraping separating layer between the sheets.

Ferner ist aus der DE-U 297 08 788 eine Anordnung bekannt, bei der das Puder direkt auf das auf dem Druckzylinder liegende Flächengebilde, dem glatt aufliegenden Bogen, aufgebracht wird, wodurch das Fördern des Bogens in der Maschine nicht beeinflusst wird. Mittels einer Sprühdüse, die nahe an das Flächengebilde herangeführt werden kann, kann das Puder mengenmäßig und über die Fläche exakt aufgetragen werden. Zu beiden Seiten der in einem Gehäuse aufgenommenen Sprühdüse sind Absaugdüsen angeordnet, die die überschüssige Pudermenge absaugen sollen. Das Gehäuse soll dabei so ausgebildet sein, dass es die Pudereinrichtung abdichtet. Ferner ist an der der Pudereinrichtung gegenüberliegenden Seite des Druckzylinders zusätzlich eine weitere Absaugdüse vorgesehen, die mit einer Blaseinrichtung zusammenwirkt. Nach dem letzten Farb-/Lackauftrag wird beim Durchlaufen der Pudereinrichtung aus der Sprühdüse Puder geblasen, das sich auf den frischen Druck setzt. Erst danach wird das Flächengebilde von der Bogenauslage übernommen und auf dem Auslagestapel abgelegt. Furthermore, from DE-U 297 08 788 an arrangement is known in which the powder directly on the flat structures lying on the impression cylinder, the smoothly resting sheet, applied which does not affect the feeding of the sheet in the machine. By means of a The spray nozzle, which can be brought close to the fabric, can measure the quantity of powder and exactly applied over the surface. On both sides of the one housing Ingested spray nozzle, suction nozzles are arranged, which contain the excess amount of powder should vacuum. The housing should be designed so that it is the powder device seals. Furthermore, on the opposite side of the powder device Printing cylinder additionally provided a further suction nozzle, which with a blowing device interacts. After the last coat of paint / varnish is passed through the powder device Powder blown from the spray nozzle, which sets itself on the fresh pressure. Only after the fabric is taken from the sheet delivery and placed on the delivery stack.

Nachteilig bei dieser Anordnung ist, dass das die Pudereinrichtung umgebende Gehäuse nicht wirksam verhindern kann, dass durch das starke Verwirbeln des Puders bei hoher Maschinengeschwindigkeit Rückstände dessen beispielsweise auch in den Druckspalt zwischen Gummizylinder und Druckzylinder gelangen.A disadvantage of this arrangement is that the housing surrounding the powder device is not can effectively prevent the strong swirling of the powder at high machine speed Residues of this, for example, in the pressure gap between the blanket cylinder and pressure cylinder arrive.

Ausgehend von den Nachteilen aus dem Stand der Technik ist es Aufgabe der Erfindung, eine Anordnung zum Pudern zu schaffen, mit der die frisch bedruckte Seite des Bogens unmittelbar nach dem letzten Farbauftrag mit einer Puderschicht versehen werden und bei der das Eindringen von Puder in das Druckwerk und damit in den Druckspalt weitestgehend vermieden werden kann.Based on the disadvantages of the prior art, it is an object of the invention to Arrangement for powdering, with which the freshly printed side of the sheet immediately after the last application of paint with a powder layer and where the penetration of powder in the printing unit and thus in the printing nip can be largely avoided can.

Diese Aufgabe wird gelöst mit einer Anordnung der eingangs genannten Art, bei der zwischen der Position des letzten Farbauftrags/Lackauftrags und der Pudereinrichtung ein zumindest das angrenzende Druckwerk abschirmender Luftschleier eingerichtet ist.This object is achieved with an arrangement of the type mentioned, in which between the position of the last paint application / paint application and the powder device at least that adjacent printing unit shielding air curtain is set up.

Mittels diesem Luftschleier, der im Bereich der bogenführenden Mantelfläche des Druckzylinders zwischen der Pudereinrichtung und dem Druckspalt im Druckwerk eingerichtet ist und in Achsrichtung des Druckzylinders verläuft, kann, zusätzlich zu den in der Pudereinrichtung gemäß dem Stand der Technik vorgesehenen Einrichtungen, wirksam das Eindringen von verwirbeltem Puder in das Druckwerk vermieden werden, da dieser eine Fläche zwischen der Pudereinrichtung und dem Druckwerk bildet und den hinter der Pudereinrichtung liegenden Bereich abschirmt.By means of this air curtain, which is in the area of the sheet-guiding outer surface of the printing cylinder is set up between the powder device and the printing nip in the printing unit and in Axial direction of the printing cylinder can, in addition to that in the powder device according to state-of-the-art facilities, effective the penetration of swirled Powder in the printing unit can be avoided, since this is an area between the powder device and the printing unit and the area behind the powder device shields.

Die Pudereinrichtung selbst kann im Wesentlichen der Pudereinrichtung nach dem Stand der Technik entsprechen, gemäß der das Puder mittels Sprühdüsen auf das Flächengebilde aufgetragen wird. Zwar sind vorzugsweise beidseitig der Sprühdüsen Absaugdüsen vorgesehen, die das aufgestäubte/verwirbelte Puder aufsaugen sollen, dennoch kann aufgrund von starken Luftströmen/Luftwirbeln, insbesondere bei hohen Maschinengeschwindigkeiten, die durch den Bogentransport selbst sowie durch die Sprüh- und Absaugdüsen verursacht werden, nicht vermieden werden, dass Puderüberreste in die Umgebung des angrenzenden Druck-/Lachwerkes gelangen. Jedoch verhindert der Luftschleier mit seiner vorbestimmten Abschirmfläche, welche vorzugsweise über die Breite des Druckzylinders hinaus bis zu den Seitenwänden gebildet ist, den Durchtritt von Puder durch denselben hindurch und schirmt somit zumindest das angrenzende Druck-/Lackwerk vor dem ungewollten Eindringen von Puder ab. The powder device itself can essentially be the powder device according to the prior art Technique according to which the powder is applied to the fabric by means of spray nozzles becomes. Suction nozzles are preferably provided on both sides of the spray nozzles should vacuum up the dusted / swirled powder, but due to strong air currents / air vortices, especially at high machine speeds caused by sheet transport themselves as well as caused by the spray and suction nozzles cannot be avoided that powder remains get into the vicinity of the adjacent printing / laughing unit. However, with its predetermined shielding surface, the air curtain prevents which is preferably formed across the width of the printing cylinder to the side walls, the passage of powder through it and thus at least shields the adjacent one Printing / varnishing unit against the unwanted penetration of powder.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist an der Absaugeinrichtung, die im Bereich der nichtbogenführenden Mantelfläche des Druckzylinders angeordnet ist, wenigstens eine am Druckzylinder angreifende Bürste angeordnet. Zum einen verhindert der Luftschleier an der bogenführenden Mantelfläche das Eindringen von Puder in das Druckwerk und zum andern greifen während des Pudervorganges gleichzeitig Bürsten an dem Druckzylinder an, welche die an diesem haftenden Puderrückstände lösen und abbürsten, damit für die Absaugeinrichtung freigeben und von dieser abgesaugt und abgeführt werden. Nach einer bevorzugten Ausführungsform sind zwei Bürsten bzw. zwei Reihen von Bürsten, die axial zum Druckzylinder angeordnet sind, vorgesehen, wobei jeweils eine Bürste/Bürstenreihe an einer Seite der Absaugeinrichtung, die sich ebenfalls in axialer Richtung zum Druckzylinder erstreckt, ausgebildet ist.According to a preferred embodiment of the invention, the suction device which is in the Area of the non-sheet-leading outer surface of the printing cylinder is arranged, at least a brush acting on the impression cylinder is arranged. First, the air curtain prevents the sheet-guiding surface the penetration of powder into the printing unit and the other during the powdering process, brushes on the pressure cylinder simultaneously attack the loosen and brush off any adhering powder residues, thus for the suction device release and be suctioned off and discharged from it. According to a preferred embodiment are two brushes or two rows of brushes arranged axially to the impression cylinder are provided, each with a brush / row of brushes on one side of the suction device, which also extends in the axial direction to the pressure cylinder, is formed.

Gemäß einer bevorzugten Ausführungsform ist der Luftschleier von einer Blaseinrichtung gebildet, mittels der der Druckzylinder mit einem auf diesen ausgerichteten Blasluftstrom beaufschlagt wird. Der Luftschleier ist hinsichtlich Luftdruck, Lufttemperatur und seines Auftreffwinkels auf den Druckzylinder derart gebildet, dass ein Luftaustausch und damit ein Austausch von in der Luft enthaltener Partikel durch den Luftschleier hindurch vermieden bzw. verhindert wird.According to a preferred embodiment, the air curtain is formed by a blowing device, by means of which the pressure cylinder is acted upon by a blast air stream aligned with it becomes. The air curtain is in terms of air pressure, air temperature and its angle of impact formed on the pressure cylinder such that an air exchange and thus an exchange of Particles contained in the air are avoided or prevented through the air curtain.

Gemäß einer Weiterbildung dieser Ausführungsform erstreckt sich die Blaseinrichtung und damit auch der Luftschleier über die gesamte Breite des Druckzylinders. Dies kann durch nebeneinander angeordnete einzelne Luftdüsen erfolgen oder mittels einer, einen langen Luftspalt aufweisenden Einrichtung, aus der die Blasluft austritt. Gemäß einer bevorzugten Ausführungsform erstreckt sich der Luftschleier jedoch über die Breite des Druckzylinders hinaus bis zu den Seitenwänden und verhindert damit zuverlässig, dass seitlich des Druckwerkes Luftverwirblungen in dasselbe eindringen.According to a development of this embodiment, the blowing device extends and thus also the air curtain across the entire width of the impression cylinder. This can be done side by side arranged individual air nozzles take place or by means of a, a long air gap having device from which the blown air emerges. According to a preferred embodiment However, the air curtain extends beyond the width of the impression cylinder to Side walls and thus reliably prevents air turbulence on the side of the printing unit penetrate into the same.

Gemäß einer weiteren Ausgestaltung der Erfindung weist die Absaugeinrichtung einen trichterförmigen Einlass auf, der mit seiner großen Öffnung auf den Druckzylinder ausgerichtet ist und sich entlang der gesamten Breite des Druckzylinders erstreckt. Die Absaugeinrichtung mit ihrer an dem Druckzylinder zugewandten Eingangsöffnung erstreckt sich entlang dessen axialer Länge und bildet so einen rinnenförmigen Kanal aus. Mit dieser Form lässt sich das abgebürstete Restpuder besonders gut auffangen, absaugen und abtransportieren. According to a further embodiment of the invention, the suction device has a funnel-shaped Inlet, which is aligned with its large opening on the impression cylinder and extends along the entire width of the impression cylinder. The suction device with your at the inlet opening facing the pressure cylinder extends along its axial Length and thus forms a channel-shaped channel. With this shape the brushed can be Catch, vacuum and remove residual powder particularly well.

Gemäß einer bevorzugten Ausgestaltung sind die Bürsten unmittelbar an der Absaugeinrichtung angeordnet und greifen entlang des gesamten Druckzylinders bürstend an diesem an. Damit bildet die Absaugeinrichtung an der nichtbogenführenden Mantelfläche samt den Bürsten, die vorzugsweise zu beiden Seiten der Abzugseinrichtung angeordnet sind, eine einzige Baugruppe.According to a preferred embodiment, the brushes are directly on the suction device arranged and brushing along the entire printing cylinder. The suction device thus forms on the non-sheet-guiding surface area together with the brushes, which are preferably arranged on both sides of the trigger device, a single one Assembly.

Anhand eines Ausführungsbeispieles soll nachfolgend die Erfindung näher beschrieben werden.The invention will be described in more detail below using an exemplary embodiment.

In der Zeichnung zeigt die

Fig.
eine schematische Darstellung eines Druckwerkes mit einer Anordnung zum Pudern eines Flächengebildes
In the drawing, the
FIG.
is a schematic representation of a printing unit with an arrangement for powdering a fabric

Die Fig. zeigt in schematischer Darstellung den Druckzylinder 3, den dem Druckzylinder 3 vorangestellten Bogenführungszylinder 4 und das dem Druckzylinder 3 nachgeordnete Kettenumlenkrad 5.The figure shows a schematic representation of the printing cylinder 3 that preceded the printing cylinder 3 Sheet guiding cylinder 4 and the chain deflection wheel arranged downstream of the impression cylinder 3 5th

Bogenführungszylinder 4, Druckzylinder 3 und das Kettenumlenkrad 5 weisen einen doppeltgroßen Durchmesser auf. Die dem Druckzylinder 3 zugeordneten Gummi- und Plattenzylinder 6,7 weisen einen einfach-großen Durchmesser auf. Die Einrichtung ist jedoch auch einsetzbar bei einer anderen Maschinenkonfiguration, wenn beispielsweise Druck- und Bogenführungszylinder 3,4 einen einfach-großen Durchmesser aufweisen.Sheet guide cylinder 4, impression cylinder 3 and the chain guide wheel 5 have a double size Diameter on. The rubber and plate cylinders assigned to the printing cylinder 3 6.7 have a single-large diameter. However, the device can also be used with a different machine configuration, for example when printing and sheet guiding cylinders 3.4 have a single-large diameter.

Der Druckzylinder 3 weist mit dem Gummizylinder 6 den gemeinsamen Tangentenpunkt T1 und mit dem Kettenumlenkrad 5 den gemeinsamen Tangentenpunkt T2 auf.The impression cylinder 3 has the common tangent point T 1 with the rubber cylinder 6 and the common tangent point T 2 with the chain deflection wheel 5.

Zwischen den Tangentenpunkten T1, T2, und zwar auf der bogenführenden Mantelfläche des Druckzylinders 3, ist die Pudereinrichtung 10 angeordnet.The powder device 10 is arranged between the tangent points T 1 , T 2 , specifically on the arc-guiding lateral surface of the printing cylinder 3.

Die Pudereinrichtung 10 hat im Einzelnen folgenden Aufbau:The powder device 10 has the following structure:

An einer Traverse 11 ist ein Gehäuse 12 befestigt, das über die Breite des Druckzylinders 3 und an beiden Stirnseiten des Druckzylinders 3 unter die Peripherie der Mantelfläche des Druckzylinders 3 reicht. Dem Gehäuse 12 ist mittig die Sprühdüse 16 der Pudereinrichtung 10 zugeordnet. Je eine Absaugdüse 13 ist dabei der Sprühdüse 16 vor- und nachgeordnet. Die Absaugdüse 13 und die Sprühdüse 16 sind über nichtdargestellte Versorgungsleitungen mit Saugluft bzw. On a crossbar 11, a housing 12 is attached, which over the width of the printing cylinder 3 and on both ends of the printing cylinder 3 under the periphery of the outer surface of the printing cylinder 3 is enough. The spray nozzle 16 of the powder device 10 is assigned centrally to the housing 12. One suction nozzle 13 is arranged upstream and downstream of the spray nozzle 16. The suction nozzle 13 and the spray nozzle 16 are via supply lines, not shown, with suction air or

Puder beaufschlagbar. Das Gehäuse 12 ist derart beschaffen, dass es die Pudereinrichtung 10 im Wesentlichen abdichtet.Powder can be applied. The housing 12 is designed in such a way that it is the powder device 10 essentially seals.

Auf dieser bogenführenden Seite des Druckzylinders 3 zwischen der Pudereinrichtung 10 und dem Gummizylinder 6 ist der Luftschleier 17, auch als Blasschwert bezeichnet, eingerichtet; Dieser Luftschleier 17 wird von einer Blaseinrichtung 18 erzeugt, welche sich im Wesentlichen über die gesamte axiale Länge des Druckzylinders 3 bzw. darüber hinaus erstreckt. Die Blaseinrichtung 18 erzeugt einen auf den Druckzylinder 3 gerichteten Luftstrom, den Luftschleier 17, der den Druckspalt im Tangentenpunkt T1 und das Druckwerk insgesamt vor Verschmutzungen, das heißt vor dem Eindringen von Puder aus der Pudereinrichtung 10 sowie von Puderpartikeln, die aufgrund von Luftverwirblungen in der Umgebung um die Pudereinrichtung 10 enthalten sind, abschirmt. Bei dem Puder handelt es sich um Puder in Pulverform, das eine staubende Trennschicht zwischen den Flächengebilden bildet.On this sheet-guiding side of the pressure cylinder 3 between the powder device 10 and the rubber cylinder 6, the air curtain 17, also referred to as a blowing sword, is set up; This air curtain 17 is generated by a blowing device 18, which extends essentially over the entire axial length of the pressure cylinder 3 or beyond. The blowing device 18 generates an air flow directed towards the pressure cylinder 3, the air curtain 17, which protects the pressure gap at the tangent point T 1 and the printing unit as a whole from soiling, that is, from the penetration of powder from the powder device 10 and of powder particles which are caused by air turbulence in the environment around the powder device 10 are shielded. The powder is powder in powder form, which forms a dusty separating layer between the flat structures.

Auf der nichtbogenführenden Fläche des Druckzylinders 3 (nach dem Tangentenpunkt T2) ist eine weitere Absaugdüse 19 vorgesehen. Die sich entlang des Druckzylinders 3 erstreckende Absaugdüse 19, die im Querschnitt trichterförmig ausgebildet ist, ist mit ihrer großen Saugöffnung auf den Druckzylinder 3 ausgerichtet. An beiden Seiten der Saugöffnung der Absaugdüse 19 sind Bürsten 14 ausgebildet, die sich ebenfalls entlang des Druckzylinders 3 erstrecken. Die Bürsten 14 greifen während des Maschinenlaufs an dem Druckzylinder 3 an und entfernen die an diesem anhaftenden Puderreste, die von der Absaugdüse 19 aufgefangen und abgesaugt werden.A further suction nozzle 19 is provided on the non-arc-guiding surface of the printing cylinder 3 (after the tangent point T 2 ). The suction nozzle 19, which extends along the pressure cylinder 3 and is funnel-shaped in cross section, is aligned with the large suction opening on the pressure cylinder 3. Brushes 14 are formed on both sides of the suction opening of the suction nozzle 19 and also extend along the pressure cylinder 3. The brushes 14 attack the printing cylinder 3 while the machine is running and remove the powder residues adhering to it, which are collected and sucked off by the suction nozzle 19.

Alternativ dazu könnte jedoch auch nur eine Bürstenreihe (nicht dargestellt) vorgesehen sein, die etwa mittig der Saugöffnung der Absaugdüse 19 angeordnet ist. Alternatively, however, only one row of brushes (not shown) could also be provided, which is arranged approximately in the middle of the suction opening of the suction nozzle 19.

BezugszeichenaufstellungREFERENCE NUMBERS

33
Druckzylinderpressure cylinder
44
BogenführungszylinderSheet guiding cylinder
55
Kettenumlenkradchain reversing wheel
66
Gummizylinderrubber cylinder
1010
Pudereinrichtungpowdering device
1111
Traversetraverse
1212
Gehäusecasing
1313
Absaugdüsesuction nozzle
T1 T 1
Tangentenpunkt Druckzylinder/GummizylinderTangent point pressure cylinder / rubber cylinder
T2 T 2
Tangentenpunkt Druckzylinder/KettenumlenkradTangent point pressure cylinder / chain deflection wheel
1414
Bürstebrush
1616
Saugdüsesuction nozzle
1717
Luftschleierair curtains
1818
Blaseinrichtungblower
1919
Absaugdüsesuction nozzle

Claims (6)

Anordnung zum Pudern von Flächengebilden in einer Druckmaschine und zum Erzeugen einer Trennschicht zwischen denselben, bei der nach dem letzten Farbauftrag mittels einer Pudereinrichtung (10) Puder auf die bedruckte Seite des Flächengebildes auftragbar ist, und bei der im Bereich der bogenführenden Mantelfläche des Druckzylinders (3) die Pudereinrichtung (10) angeordnet ist, und im Bereich der nichtbogenführenden Mantelfläche des Druckzylinder (3) eine Absaugeinrichtung (19) angeordnet ist, wobei zwischen der Position des letzten Farbauftrages (T1) und der Pudereinrichtung (10) ein zumindest das angrenzende Druckwerk abschirmender Luftschleier (17) eingerichtet ist.Arrangement for powdering flat structures in a printing machine and for producing a separating layer between them, in which powder can be applied to the printed side of the flat structure by means of a powder device (10) after the last color application, and in the area of the sheet-guiding lateral surface of the printing cylinder (3 ) the powder device (10) is arranged, and a suction device (19) is arranged in the region of the non-sheet-leading outer surface of the printing cylinder (3), with at least the adjacent printing unit between the position of the last ink application (T 1 ) and the powder device (10) shielding air curtain (17) is set up. Anordnung nach Anspruch 1, bei der an der Absaugeinrichtung (19) wenigstens eine am Druckzylinder (3) angreifende Bürste (14) angeordnet ist.Arrangement according to Claim 1, in which at least one on the suction device (19) Pressure cylinder (3) engaging brush (14) is arranged. Anordnung nach Anspruch 1 oder 2, bei der der Luftschleier (17) mittels einer den Druckzylinder (3) mit Blasluft beaufschlagenden Blaseinrichtung (18) gebildet ist.Arrangement according to claim 1 or 2, wherein the air curtain (17) by means of a Pressure cylinder (3) with blowing air blowing device (18) is formed. Anordnung nach Anspruch 3, bei der sich die Blaseinrichtung (18) entlang des gesamten Druckzylinders (3) erstreckt und die Blasluft einen dichten Luftschleier (17) bildet.Arrangement according to claim 3, wherein the blowing device (18) along the entire Pressure cylinder (3) extends and the blown air forms a tight air curtain (17). Anordnung nach einem der Ansprüche 1 bis 4, bei der die Absaugeinrichtung (19) einen trichterförmigen Einlass aufweist, der mit seiner großen Öffnung auf den Druckzylinder (3) ausgerichtet ist und sich entlang des gesamten Druckzylinders (3) erstreckt.Arrangement according to one of claims 1 to 4, wherein the suction device (19) one Has funnel-shaped inlet with its large opening on the pressure cylinder (3) is aligned and extends along the entire printing cylinder (3). Anordnung nach einem der Ansprüche 1 bis 4, bei der die Bürsten (14) unmittelbar an der Absaugeinrichtung (19) angeordnet sind und entlang des gesamten Druckzylinders (3) bürstend angreifen.Arrangement according to one of claims 1 to 4, wherein the brushes (14) directly on the suction device (19) are arranged and along the entire pressure cylinder (3) Brushing attack.
EP20030008407 2002-06-19 2003-04-11 Device for powdering sheets in a printing machine Expired - Fee Related EP1375144B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002127242 DE10227242A1 (en) 2002-06-19 2002-06-19 Arrangement for powdering fabrics in a printing press
DE10227242 2002-06-19

Publications (3)

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EP1375144A2 true EP1375144A2 (en) 2004-01-02
EP1375144A3 EP1375144A3 (en) 2004-06-30
EP1375144B1 EP1375144B1 (en) 2006-01-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1719937A2 (en) * 2005-04-13 2006-11-08 Komori Corporation Air flow adjusting apparatus
EP2228215A1 (en) * 2009-03-12 2010-09-15 manroland AG Sheet-fed treating machine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20070623A1 (en) 2007-09-13 2009-03-14 Marposs Spa EQUIPMENT FOR THE CONTROL OF MECHANICAL PARTS WITH OPTICAL DEVICES AND RELATIVE DEVICE AND PROTECTION METHOD
IT201700064533A1 (en) 2017-06-12 2018-12-12 Marposs Spa Optoelectronic equipment for the control of mechanical parts, and relative protection device

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Publication number Priority date Publication date Assignee Title
DE2151185A1 (en) 1971-10-14 1973-04-19 Maschf Augsburg Nuernberg Ag DEVICE FOR APPLYING POWDER TO THE PRINT CARRIER ON OFFSET ROTARY PRINTING MACHINES
DE4445457A1 (en) 1994-12-20 1996-07-04 Heidelberger Druckmasch Ag Method for applying a spacer material to a printing sheet and sheet printing machine equipped for carrying out the method
DE29708788U1 (en) 1997-05-17 1997-07-17 Kba Planeta Ag Device for powdering flat structures in printing machines

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DE19600075A1 (en) * 1996-01-03 1997-07-10 Hans Georg Platsch Device for powdering printed matter
DE19609438B4 (en) * 1996-03-11 2007-10-11 Platsch, Hans Georg Device for dusting printed products
WO1998052757A1 (en) * 1997-05-17 1998-11-26 Koenig & Bauer Ag Sheet feed device with two sheet drums and subsequent processing device
DE19859246A1 (en) * 1998-01-20 1999-07-22 Koch Hans Peter Sheet offset printing process
EP1066160B1 (en) * 1998-02-25 2003-01-08 Hans-Peter Koch Offset printing method and an offset printing machine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2151185A1 (en) 1971-10-14 1973-04-19 Maschf Augsburg Nuernberg Ag DEVICE FOR APPLYING POWDER TO THE PRINT CARRIER ON OFFSET ROTARY PRINTING MACHINES
DE4445457A1 (en) 1994-12-20 1996-07-04 Heidelberger Druckmasch Ag Method for applying a spacer material to a printing sheet and sheet printing machine equipped for carrying out the method
DE29708788U1 (en) 1997-05-17 1997-07-17 Kba Planeta Ag Device for powdering flat structures in printing machines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1719937A2 (en) * 2005-04-13 2006-11-08 Komori Corporation Air flow adjusting apparatus
EP1719937A3 (en) * 2005-04-13 2006-11-15 Komori Corporation Air flow adjusting apparatus
EP2228215A1 (en) * 2009-03-12 2010-09-15 manroland AG Sheet-fed treating machine

Also Published As

Publication number Publication date
DE50302151D1 (en) 2006-04-06
EP1375144B1 (en) 2006-01-11
EP1375144A3 (en) 2004-06-30
DE10227242A1 (en) 2004-02-05

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