EP3543013B1 - Web printer - Google Patents
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- Publication number
- EP3543013B1 EP3543013B1 EP18163065.8A EP18163065A EP3543013B1 EP 3543013 B1 EP3543013 B1 EP 3543013B1 EP 18163065 A EP18163065 A EP 18163065A EP 3543013 B1 EP3543013 B1 EP 3543013B1
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- EP
- European Patent Office
- Prior art keywords
- web
- roll
- printing machine
- machine according
- openings
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/02—Conveying or guiding webs through presses or machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/02—Platens
- B41J11/04—Roller platens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
- B41J15/005—Forming loops or sags in webs, e.g. for slackening a web or for compensating variations of the amount of conveyed web material (by arranging a "dancing roller" in a sag of the web material)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
- B41J15/02—Web rolls or spindles; Attaching webs to cores or spindles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
- B41J15/04—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/30—Orientation, displacement, position of the handled material
- B65H2301/31—Features of transport path
- B65H2301/311—Features of transport path for transport path in plane of handled material, e.g. geometry
- B65H2301/31122—Omega-shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/15—Digital printing machines
Definitions
- the present invention relates to a printing machine for printing on a web, comprising a first roll and a second roll, between which the web forms a loop.
- a web printing machine comprising a system of driven axes for feeding a web to processing stations and for guiding the web in at least one compensating loop forming a material store.
- the object of the invention is to create a printing machine in which the web is guided gently.
- a printing machine for printing a web comprising a first roll and a second roll, between which the web forms a loop, characterized in that between the first roll and the second roll a simply curved shell is arranged with suction openings and / or blow openings for the pneumatic guidance of the loop which is equidistant with respect to a predominant length of curvature of the shell.
- the printing machine can be a digital printing machine, preferably for inkjet printing.
- the shell can have suction openings and blow openings for the contactless guiding of the loop.
- the suction openings and blowing openings can be active at the same time in order to keep the web at a defined distance from the tray.
- the suction openings can be grooves which run in the transport or running direction of the web or at an angle to it.
- the grooves can preferably run parallel to one another or diverge from one another in the machine direction, for example in order to tighten the web in the transverse direction.
- the blow openings can form rows of nozzles which are arranged alternately with the suction openings.
- the rows of nozzles can consist of bores, for example, which eject the blown air in a radial direction with respect to the nozzle surface of the shell.
- the shell can be arranged on the outside of the loop and a support roller can be arranged on the inside of the loop, which is out of contact with the web in the trouble-free printing operation.
- the strength of the suction air of the suction openings and the blowing air of the blowing openings can be balanced in such a way that the web runs floating between the two without contact with the shell and the support roller.
- the support roller only needs to support the web when the suction air of the tray is not active, e.g. if the vacuum generator to which the tray is connected fails or is switched off, e.g. when the web is being fed in or during another set-up process.
- An inner peripheral surface of the shell and an outer peripheral surface of the support roller can be parallel to each other.
- the shell and support roller can delimit a semicircular gap between them through which the web runs without contact during printing.
- a format setting device for setting the suction openings to the respective width of the web can be present.
- the same format setting device or an additional format setting device can be used to adjust the blow openings to the respective width of the web.
- Each format setting device can be a valve with a gate valve.
- the blower openings can be throttle nozzles in which the air flow is throttled by a filter insert or a channel labyrinth.
- the filter insert can be a Be a piece of foam that sits in the nozzle bore.
- the channel labyrinth can be a perforated plate labyrinth which forms a channel for connecting the blow openings to a blower air generator.
- the first roller and / or the second roller can be a cooling roller for cooling the web, the cooling roller having a cooling fluid flowing through it.
- each cooling roller can be integrated into a circuit through which the cooling fluid is circulated with a pump.
- the first roller, the second roller and the tray can be arranged along a transport path of the web between a drying or pinning device and at least one subsequent inkjet print head.
- the web guide, to which the two rollers and the tray belong can be arranged after a primer or primer coating device, e.g. for opaque white, and in front of a device for multi-color inkjet printing, e.g. with four or more pressure bars.
- Figure 1 shows a digital printing machine through which a web B of printing material runs in a direction R indicated by the arrow.
- a primer or a primer is applied to the web B with a coating device 10, which is designed as an inkjet print head.
- the applied primer or the applied primer is dried with a pinning device 8.
- one or more inkjet print heads 9 are used to print a print image on the primer or the primer.
- a first roller 1 and a second roller 2 are arranged along the path B between the pinning device 8 and the inkjet printing head 9, and a tray 3 and a support roller 6 are arranged between the two rollers 1, 2. Between the two rolls 1, 2, the web B forms a loop or loop S.
- the shell 3 is on the same side of the web B as the rolls 1, 2, namely the back of the web B which is not coated by the coating device 10 the opposite side, namely the front side of the web B coated by the coating device 10, is the support roller 6.
- the shell 3 ensures that the loop S is stable, so that the web B wraps around the rolls 1, 2 over a maximized circumferential angle.
- the area of contact between the web B and the roller 1 or 2 is large and the heat transfer from the web B to the respective roller 1 or 2 is also correspondingly large.
- the web B When the web B is treated with the pinning device 8, the web B is heated in an undesirable manner, which is an unavoidable side effect. This heating of the web B would be detrimental to the print quality when printing the web B with the inkjet print head 9 if no countermeasures are taken. Without a countermeasure, longitudinal folds would occur in the web B, which would be visible in the print image of the inkjet print head 9.
- the countermeasure consists in cooling the web B by means of one or preferably both rollers 1, 2, for which purpose these are designed as cooling rollers.
- the roles 1, 2 are traversed by a coolant, for example cooling water, and bring about a lowering of the temperature of the web B to a value at which the longitudinal folds do not occur and the subsequent inkjet printing is not impaired.
- Figure 2 shows that the shell 3 has a length of curvature L which, in the present case of the ideally circular-arc-shaped shell 3, is a circular arc length.
- L the length of curvature
- the distance a is constant along almost the entire length of the curvature L. Only in the two end sections of the length of curvature L, namely the inlet area and outlet area of the web B, the distance a can be different, for example smaller, than in the main section of the length of curvature L lying in between, due to special pneumatic features.
- Figure 3 shows the shell 3 as an individual part in a developed view with a view of the nozzle surface of the shell 3, which faces the web B.
- the one-dimensionally curved guide surface or nozzle surface of the shell 3 has the geometric axis of rotation of the support roller 6 as its center of curvature.
- the inner peripheral surface or guide surface of the shell 3 thus runs concentrically with the outer peripheral surface of the support roller 6 - cf. Figure 2 .
- Suction openings 4 and blow openings 5 are made in the guide surface or nozzle surface.
- the suction openings 4 are connected via a format setting device 7 to a vacuum generator, not shown in detail, and the blow openings 5 are connected via the format setting device 7 to a compressed air source not shown in detail.
- the blow openings 5 are designed as throttle nozzles and are arranged in rows which run parallel to the running direction R of the web B.
- the suction openings 4 are designed as grooves which also run parallel to the direction R of travel. Viewed transversely to the direction of travel R, the suction openings 4 are arranged alternating with the blow openings 5.
- Deviating from the in Figure 3 The pattern shown can also run several rows of throttle nozzles between two suction grooves and / or several suction grooves can also run between two rows of throttle nozzles.
- the suction openings 4 and / or blowing openings 5 lying outside the format width of the web B and not covered by it can be deactivated.
- the strength of the vacuum applied to the suction openings 4 and the strength of the blown air ejected from the vacuum openings 5 are balanced to one another so that the air drawn in through the suction openings 4 and at the same time carried by the blow openings 5 on an air cushion Web B without contact with the shell 3 and also without contact with the support roller 6 runs floating between the two as long as the printing operation is free of disruptions.
- the web B can contact the support roller 6 and cling to it during a fault in the printing operation or during a foreseen or unforeseen interruption in printing. If the web B continues to run during the disturbance or printing interruption, the web B can drive the support roller 6 around which it wraps by means of circumferential surface friction. The support roller 6 can run along with the web B without its own drive.
- Figure 4 shows a modification which differs from the example in Figure 3 only differs in that the grooves (suction openings 4) and the rows of throttle nozzles (Blowing openings 5) run obliquely at a preferably acute angle relative to the running direction R of the web B.
Description
Vorliegende Erfindung betrifft eine Druckmaschine zum Bedrucken einer Bahn, die eine erste Rolle und eine zweite Rolle umfasst, zwischen denen die Bahn eine Schlinge bildet.The present invention relates to a printing machine for printing on a web, comprising a first roll and a second roll, between which the web forms a loop.
In
In
Aufgabe der Erfindung ist, eine Druckmaschine zu schaffen, bei der die Bahn schonend geführt wird.The object of the invention is to create a printing machine in which the web is guided gently.
Die Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst, nämlich durch eine Druckmaschine zum Bedrucken einer Bahn, umfassend eine erste Rolle und eine zweite Rolle, zwischen denen die Bahn eine Schlinge bildet, dadurch gekennzeichnet, dass zwischen der ersten Rolle und der zweiten Rolle eine einfach gekrümmte Schale mit Saugöffnungen und/oder Blasöffnungen zum pneumatischen und bezüglich einer überwiegenden Krümmungslänge der Schale äquidistanten Führen der Schlinge angeordnet ist.The object is achieved according to the invention by the features of claim 1, namely by a printing machine for printing a web, comprising a first roll and a second roll, between which the web forms a loop, characterized in that between the first roll and the second roll a simply curved shell is arranged with suction openings and / or blow openings for the pneumatic guidance of the loop which is equidistant with respect to a predominant length of curvature of the shell.
Es sind verschiedene Weiterbildungen möglich:
Die Druckmaschine kann eine Digitaldruckmaschine sein, vorzugsweise für Inkjetdruck.Various training courses are possible:
The printing machine can be a digital printing machine, preferably for inkjet printing.
Die Schale kann Saugöffnungen und Blasöffhungen zum kontaktlosen Führen der Schlinge haben. Die Saugöffnungen und Blasöffhungen können gleichzeitig aktiv sein, um die Bahn in definiertem Abstand zur Schale zu halten.The shell can have suction openings and blow openings for the contactless guiding of the loop. The suction openings and blowing openings can be active at the same time in order to keep the web at a defined distance from the tray.
Die Saugöffnungen können Nuten sein, die in Transport- oder Laufrichtung der Bahn oder dazu schräg verlaufen. Die Nuten können vorzugsweise miteinander parallel verlaufen oder in Laufrichtung voneinander divergieren, z.B. um die Bahn in Querrichtung zu straffen.The suction openings can be grooves which run in the transport or running direction of the web or at an angle to it. The grooves can preferably run parallel to one another or diverge from one another in the machine direction, for example in order to tighten the web in the transverse direction.
Die Blasöffnungen können Düsenreihen bilden, die im Wechsel mit den Saugöffnungen angeordnet sind. Die Düsenreihen können z.B. aus Bohrungen bestehen, die bezüglich der Düsenfläche der Schale die Blasluft in Radialrichtung ausstoßen.The blow openings can form rows of nozzles which are arranged alternately with the suction openings. The rows of nozzles can consist of bores, for example, which eject the blown air in a radial direction with respect to the nozzle surface of the shell.
Die Schale kann auf der Außenseite der Schlinge angeordnet sein und auf der Innenseite der Schlinge kann eine Stützrolle angeordnet sein, die im störungsfrei laufenden Druckbetrieb außer Kontakt mit der Bahn steht. Die Stärke der Saugluft der Saugöffnungen und der Blasluft der Blasöffnungen können so ausbalanciert sein, dass die Bahn ohne Kontakt mit der Schale und der Stützrolle zwischen beiden schwebend läuft. Die Stützrolle braucht die Bahn nur zu stützen, wenn die Saugluft der Schale nicht aktiv ist, z.B. bei einem Ausfall oder einer Abschaltung des Vakuumerzeugers, an den die Schale angeschlossen ist, z.B. einer Abschaltung beim Einfädeln der Bahn oder einem anderen Rüstprozess.The shell can be arranged on the outside of the loop and a support roller can be arranged on the inside of the loop, which is out of contact with the web in the trouble-free printing operation. The strength of the suction air of the suction openings and the blowing air of the blowing openings can be balanced in such a way that the web runs floating between the two without contact with the shell and the support roller. The support roller only needs to support the web when the suction air of the tray is not active, e.g. if the vacuum generator to which the tray is connected fails or is switched off, e.g. when the web is being fed in or during another set-up process.
Eine Innenumfangsfläche der Schale und eine Außenumfangsfläche der Stützrolle können miteinander parallel verlaufen. Die Schale und Stützrolle können zwischen sich einen halbringförmigen Spalt begrenzen, durch den im Druckbetrieb die Bahn kontaktlos läuft.An inner peripheral surface of the shell and an outer peripheral surface of the support roller can be parallel to each other. The shell and support roller can delimit a semicircular gap between them through which the web runs without contact during printing.
Eine Formateinstelleinrichtung zum Einstellen der Saugöffnungen auf die jeweilige Breite der Bahn kann vorhanden sein. Zum Einstellen der Blasöffhungen auf die jeweilige Breite der Bahn kann dieselbe Formateinstelleinrichtung oder eine zusätzliche Formateinstelleinrichtung verwendet werden. Jede Formateinstelleinrichtung kann ein Ventil mit Sperrschieber sein.A format setting device for setting the suction openings to the respective width of the web can be present. The same format setting device or an additional format setting device can be used to adjust the blow openings to the respective width of the web. Each format setting device can be a valve with a gate valve.
Die Blasöffhungen können Drosseldüsen sein, bei denen der Luftstrom durch einen Filtereinsatz oder ein Kanallabyrinth gedrosselt wird. Der Filtereinsatz kann ein Schaumstoffstück sein, das in der Düsenbohrung sitzt. Das Kanallabyrinth kann ein Lochplattenlabyrinth sein, das einen Kanal zum Anschluss der Blasöffhungen an einen Blaslufterzeuger bildet.The blower openings can be throttle nozzles in which the air flow is throttled by a filter insert or a channel labyrinth. The filter insert can be a Be a piece of foam that sits in the nozzle bore. The channel labyrinth can be a perforated plate labyrinth which forms a channel for connecting the blow openings to a blower air generator.
Die erste Rolle und/oder die zweite Rolle kann eine Kühlwalze zum Kühlen der Bahn sein, wobei die Kühlwalze von einem Kühlfluid durchströmt ist. Hierbei kann jede Kühlwalze in einen Kreislauf integriert sein, durch den das Kühlfluid mit einer Pumpe zirkuliert wird.The first roller and / or the second roller can be a cooling roller for cooling the web, the cooling roller having a cooling fluid flowing through it. Here, each cooling roller can be integrated into a circuit through which the cooling fluid is circulated with a pump.
Die erste Rolle, die zweite Rolle und die Schale können entlang eines Transportpfads der Bahn zwischen einer Trocknungs- oder Pinning-Einrichtung und mindestens einem nachfolgenden Inkjet-Druckkopf angeordnet sein. Die Bahnführung, zu der die beiden Rollen und die Schale gehören, kann nach einer Grundierungs- oder Primer-Beschichtungseinrichtung, z.B. für Deckweiß, und vor einer Einrichtung für den mehrfarbigen Inkjet-Druck, z.B. mit vier oder mehr Druckbalken, angeordnet sein.The first roller, the second roller and the tray can be arranged along a transport path of the web between a drying or pinning device and at least one subsequent inkjet print head. The web guide, to which the two rollers and the tray belong, can be arranged after a primer or primer coating device, e.g. for opaque white, and in front of a device for multi-color inkjet printing, e.g. with four or more pressure bars.
Weiterbildungen ergeben sich auch aus der folgenden Beschreibung eines Ausführungsbeispiels und der zugehörigen Zeichnung, worin zeigt:
- Figur 1:
- eine Digitaldruckmaschine mit einer Schale zum Führen einer Bedruckstoffbahn in schematischer Darstellung,
- Figur 2:
- die Führungsschale zusammen mit einer Stützrolle in räumlicher Darstellung,
- Figur 3:
- eine Draufsicht auf eine Düsenfläche der Führungsschale und
- Figur 4:
- eine Modifikation der Düsenfläche.
- Figure 1:
- a digital printing machine with a shell for guiding a substrate web in a schematic representation,
- Figure 2:
- the guide shell together with a support roller in a spatial representation,
- Figure 3:
- a plan view of a nozzle surface of the guide shell and
- Figure 4:
- a modification of the nozzle area.
In den
Entlang der Bahn B zwischen der Pinning-Einrichtung 8 und dem Inkjet-Druckkopf 9 sind eine erste Rolle 1 und eine zweite Rolle 2 angeordnet und sind zwischen den beiden Rollen 1, 2 eine Schale 3 und Stützrolle 6 angeordnet. Zwischen den beiden Rollen 1, 2 bildet die Bahn B eine Schlaufe oder Schlinge S. Die Schale 3 befindet sich auf der gleichen Seite der Bahn B wie die Rollen 1, 2, nämlich der durch die Beschichtungseinrichtung 10 nicht beschichteten Rückseite der Bahn B. Auf der entgegengesetzten Seite, nämlich der durch die Beschichtungseinrichtung 10 beschichteten Vorderseite der Bahn B, befindet sich die Stützrolle 6.A first roller 1 and a
Die Schale 3 sorgt im Druckbetrieb dafür, dass die Schlinge S stabil ist, so dass die Bahn B die Rollen 1, 2 jeweils über einen maximierten Umfangswinkel hinweg umschlingt. Dadurch ist die Fläche des Kontaktes zwischen der Bahn B und der Rolle 1 bzw. 2 groß und ist die Wärmeübertragung von der Bahn B auf die jeweilige Rolle 1 bzw. 2 auch dementsprechend groß.In the printing operation, the
Bei der Behandlung der Bahn B mit der Pinning-Einrichtung 8 wird die Bahn B in unerwünschter Weise erwärmt, was ein unvermeidlicher Nebeneffekt ist. Diese Erwärmung der Bahn B würde der Druckqualität beim Bedrucken der Bahn B mit dem Inkjet-Druckkopf 9 abträglich sein, wenn keine Gegenmaßnahme getroffen wird. Ohne Gegenmaßnahme würden in der Bahn B Längsfalten auftreten, die im Druckbild des Inkjet-Druckkopfs 9 sichtbar wären.When the web B is treated with the
Die Gegenmaßnahme besteht in einem Kühlen der Bahn B mittels einer der oder vorzugsweise beider Rollen 1, 2, wozu diese als Kühlrollen ausgebildet sind. Die Rollen 1, 2 werden von einem Kühlmittel, z.B. Kühlwasser, durchflossen und bewirken eine Absenkung der Temperatur der Bahn B auf einen Wert, bei dem die Längsfalten nicht auftreten und der nachfolgende Inkjet-Druck nicht beeinträchtigt ist.The countermeasure consists in cooling the web B by means of one or preferably both
In die Führungsfläche bzw. Düsenfläche sind Saugöffnungen 4 und Blasöffnungen 5 eingebracht. Die Saugöffnungen 4 sind über eine Formateinstelleinrichtung 7 an einen nicht näher dargestellten Vakuumerzeuger angeschlossen und die Blasöffnungen 5 sind über die Formateinstelleinrichtung 7 an eine nicht näher dargestellte Druckluftquelle angeschlossen.
Die Blasöffnungen 5 sind als Drosseldüsen ausgebildet und in Reihen angeordnet, die mit der Laufrichtung R der Bahn B parallel verlaufen. Die Saugöffnungen 4 sind als Nuten ausgebildet, welche ebenfalls mit der Laufrichtung R parallel verlaufen. Quer zur Laufrichtung R gesehen sind die Saugöffnungen 4 im Wechsel mit den Blasöffnungen 5 angeordnet.The
Abweichend von dem in
Mit der Formateinstelleinrichtung 7, welche nur schematisch angedeutet ist, können die außerhalb der Formatbreite der Bahn B liegenden und von dieser nicht überdeckten Saugöffnungen 4 und/oder Blasöffhungen 5 deaktiviert werden.With the
Durch entsprechende Einstellungen des Vakuumerzeugers und der Druckluftquelle ist die Stärke des an den Saugöffnungen 4 anliegenden Vakuums und die Stärke der aus den Vakuumöffnungen 5 ausgestoßenen Blasluft zueinander so ausbalanciert, dass die durch die Saugöffnungen 4 angesaugte und dabei gleichzeitig durch die Blasöffnungen 5 auf einem Luftpolster getragene Bahn B ohne Kontakt mit der Schale 3 und ebenfalls ohne Kontakt mit der Stützrolle 6 zwischen beiden schwebend läuft, solange der Druckbetrieb störungsfrei ist.By appropriate settings of the vacuum generator and the compressed air source, the strength of the vacuum applied to the
Die Bahn B kann die Stützrolle 6 kontaktieren und sich an diese anschmiegen, während einer Störung im Druckbetrieb oder während einer vorhergesehenen oder unvorhergesehenen Druckunterbrechung. Wenn die Bahn B während der Störung oder Druckunterbrechung weiterläuft, kann die Bahn B die von ihr umschlungene Stützrolle 6 über Umfangsflächenreibung antreiben. Die Stützrolle 6 kann hierbei ohne Eigenantrieb mit der Bahn B mitlaufen.The web B can contact the
Im störungsfreien Druckbetrieb ist sichergestellt, dass das durch die Pinning-Einrichtung 8 noch nicht vollständig getrocknete oder gehärtete Druckbild der Beschichtungseinrichtung 10 vor Beschädigungen geschützt ist, weil dieses Druckbild mit der Stützrolle 6 nicht in Kontakt kommt. Durch die die Bahn B berührungslos führende Schale 3 ist eine sehr schonende Bahnführung gewährleistet.In the trouble-free printing operation, it is ensured that the print image of the
- 11
- erste Rollefirst role
- 22
- zweite Rollesecond role
- 33
- SchaleBowl
- 44th
- SaugöffnungSuction opening
- 55
- BlasöffnungBlow hole
- 66th
- StützrolleSupport roller
- 77th
- FormateinstelleinrichtungFormat setting device
- 88th
- Pinning-EinrichtungPinning facility
- 99
- Inkjet-DruckkopfInkjet printhead
- 1010
- BeschichtungseinrichtungCoating device
- aa
- Abstanddistance
- BB.
- Bahntrain
- LL.
- KrümmungslängeCurvature length
- RR.
- LaufrichtungRunning direction
- SS.
- Schlingeloop
Claims (10)
- Printing machine for printing on a web (B), the machine comprising a first roll (1) and a second roll (2) between which the web (B) forms a loop (S),
characterized
in that a single-curve cup (3) with suction openings (4) and/or blower openings (5) is disposed between the first roll (1) and the second roll (2) to pneumatically guide the loop (S) without contact and equidistantly relative to a major part of the length of curvature (L) of the cup (3). - Printing machine according to claim 1,
characterized
in that the cup (3) has suction openings (4) and blower openings (5) for guiding the loop (S) without contact. - Printing machine according to claim 2,
characterized
in that the suction openings (4) are grooves either extending in parallel with the direction (R) of travel of the web (B) or at an oblique angle relative to the direction (R) of travel. - Printing machine according to claim 2 or 3,
characterized
in that the blower openings (5) form nozzle rows arranged to alternate with the suction openings (4). - Printing machine according to any one of claims 1 to 4,
characterized
in that the cup (3) is disposed on the outer side of the loop (S) and in that a support roll (6) that is out of contact with the web (B) during a printing operation without disturbance is disposed on the inner side of the loop (S). - Printing machine according to claim 5,
characterized
in that an inner circumferential surface of the cup (3) and an outer circumferential surface of the support roll (6) extend in parallel with one another. - Printing machine according to any one of claims 2 to 6,
characterized
in that a format adjustment device (7) for adapting the suction openings (4) to the respective width of the web (B) is provided, - Printing machine according to any one of claims 2 to 7,
characterized
in that the blower openings (5) are throttle nozzles whose air flow is throttled by a filter insert or a channel labyrinth. - Printing machine according to any one of claims 1 to 8,
characterized
in that the first roll (1) and/or the second roll (2) is a cooling roll for cooling the web (B) and in that a coolant fluid passes through said cooling roll. - Printing machine according to any one of claims 1 to 9,
characterized
in that the first roll (1), the second roll (2) and the cup (3) are disposed between a drying or pinning device (8) and at least one downstream inkjet printing head (9) along a path of transport of the web (B).
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18163065.8A EP3543013B1 (en) | 2018-03-21 | 2018-03-21 | Web printer |
CN201910187797.3A CN110293773B (en) | 2018-03-21 | 2019-03-13 | Web printing machine |
JP2019052737A JP7222769B2 (en) | 2018-03-21 | 2019-03-20 | web printing machine |
US16/360,241 US10717301B2 (en) | 2018-03-21 | 2019-03-21 | Web-fed printing machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18163065.8A EP3543013B1 (en) | 2018-03-21 | 2018-03-21 | Web printer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3543013A1 EP3543013A1 (en) | 2019-09-25 |
EP3543013B1 true EP3543013B1 (en) | 2021-06-09 |
Family
ID=61731677
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18163065.8A Active EP3543013B1 (en) | 2018-03-21 | 2018-03-21 | Web printer |
Country Status (4)
Country | Link |
---|---|
US (1) | US10717301B2 (en) |
EP (1) | EP3543013B1 (en) |
JP (1) | JP7222769B2 (en) |
CN (1) | CN110293773B (en) |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3061159A (en) * | 1958-09-15 | 1962-10-30 | A C T Inc | Air actuated self-energizing tensioning system |
DE1951002C3 (en) * | 1969-10-09 | 1974-02-07 | Vits-Maschinenbau Gmbh, 4018 Langenfeld | Device for contactless stabilization of a web of material that is stretched and moved in its longitudinal direction |
US3807612A (en) * | 1973-05-15 | 1974-04-30 | Fmc Corp | Web feeding apparatus for blank making machine |
DE2365668C3 (en) * | 1973-08-27 | 1979-10-25 | Juergen 1000 Berlin Schulz | Device for processing web-like material with a rotary printing unit |
DD228795A1 (en) * | 1984-11-19 | 1985-10-23 | Polygraph Leipzig | ARC DIRECTION IN THE OUTLET DRIVE AREA OF PRINTING MACHINES |
JP2001301301A (en) * | 2000-04-26 | 2001-10-31 | Riso Kagaku Corp | Stencil printing equipment |
DE10032675B4 (en) * | 2000-07-05 | 2006-06-14 | Aradex Ag | Web-processing machine |
JP2005305794A (en) * | 2004-04-21 | 2005-11-04 | Komori Corp | Dryer for sheet-like object |
DE102007034246B4 (en) | 2007-07-23 | 2010-10-28 | OCé PRINTING SYSTEMS GMBH | Device with a Vorzentriervorrichtung and a buffer device for the supply of a printing material web to a printing device |
JP4963683B2 (en) * | 2008-03-31 | 2012-06-27 | 富士フイルム株式会社 | Inkjet recording device |
JP5885335B2 (en) * | 2012-01-06 | 2016-03-15 | 東レエンジニアリング株式会社 | Air dancer |
JP2014101159A (en) * | 2012-11-16 | 2014-06-05 | Bellmatic Ltd | Transport device |
KR102023581B1 (en) * | 2012-11-23 | 2019-09-24 | 해성디에스 주식회사 | Reel-to-Reel inspection apparatus and inspection method using the same |
CN103465621B (en) * | 2013-09-11 | 2015-07-08 | 上海美声服饰辅料有限公司 | Air floating drying system and method for screen print |
CN204894762U (en) * | 2015-07-27 | 2015-12-23 | 天津中荣印刷科技有限公司 | Printing machine drying device |
-
2018
- 2018-03-21 EP EP18163065.8A patent/EP3543013B1/en active Active
-
2019
- 2019-03-13 CN CN201910187797.3A patent/CN110293773B/en active Active
- 2019-03-20 JP JP2019052737A patent/JP7222769B2/en active Active
- 2019-03-21 US US16/360,241 patent/US10717301B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US10717301B2 (en) | 2020-07-21 |
JP2019167245A (en) | 2019-10-03 |
EP3543013A1 (en) | 2019-09-25 |
CN110293773B (en) | 2021-04-09 |
CN110293773A (en) | 2019-10-01 |
US20190291470A1 (en) | 2019-09-26 |
JP7222769B2 (en) | 2023-02-15 |
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