EP0748283B1 - Process for guiding freshly coated sheets - Google Patents

Process for guiding freshly coated sheets Download PDF

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Publication number
EP0748283B1
EP0748283B1 EP95910425A EP95910425A EP0748283B1 EP 0748283 B1 EP0748283 B1 EP 0748283B1 EP 95910425 A EP95910425 A EP 95910425A EP 95910425 A EP95910425 A EP 95910425A EP 0748283 B1 EP0748283 B1 EP 0748283B1
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EP
European Patent Office
Prior art keywords
air
supply box
fan
guide surface
supply
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
Application number
EP95910425A
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German (de)
French (fr)
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EP0748283A1 (en
Inventor
Jürgen Alfred Stiel
Volkmar Rolf Schwitzky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koenig and Bauer AG
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Koenig and Bauer Albert AG
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Publication date
Application filed by Koenig and Bauer Albert AG filed Critical Koenig and Bauer Albert AG
Publication of EP0748283A1 publication Critical patent/EP0748283A1/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0403—Drying webs
    • B41F23/0423—Drying webs by convection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations

Definitions

  • the invention relates to a device for guiding of arches over a continuous guide surface in a processing machine according to the preamble of Claim 1.
  • DE-PS 34 11 029 describes a continuous Guide surface with air nozzles that act as bores are trained.
  • the air nozzles are optionally available as Blow or suction nozzles can be operated.
  • a disadvantage of this Nozzle is that there is no suction effect in the blowing mode and no directional force to tighten the bow can be generated.
  • Neither version has one facility Bow by means of a second air cushion on one Clamped top and with a drying of the Can be done.
  • DE-PS 34 43 704 shows a conveyor device for sheets with two guide surfaces arranged one above the other. These guide surfaces are provided with bores which are used as air nozzles. The bow is clamped between two air cushions. The disadvantage here is that the sheet hovers in an undefined position between these air cushions and thus tends to flutter slightly. These air nozzles are supplied by a large number of fans, which requires a great deal of control and installation work.
  • DE-PS 14 49 656 describes a device for flutter-free guiding of flat material.
  • blow boxes provided with slot nozzles are provided for guiding flat material, and blow boxes with vertically emerging blowing jets are arranged opposite for drying.
  • the disadvantage here is that there is no continuous guide surface and thus the flat material tends to form waves.
  • the energy expenditure for guiding the sheets is high.
  • the invention is based on the object Device for guiding freshly coated sheets along a guide surface in a Processing machine, preferably Rotary printing machine, optionally with two operating modes to create, being in a first mode "Air and drying operation” Air supply box of the guide surface and a Air supply box for impact jet nozzles with compressed air can be applied and in a second Operating mode "suction air and drying mode" of the Energy requirements, and thus the operating costs, of Device according to the invention compared to the state of the Technology can be significantly reduced without that To influence drying significantly.
  • the advantages that can be achieved with the invention are, in particular, that in addition to a first mode of operation - the air and drying mode - a second mode of operation - the suction air and drying mode - of the device according to the invention is possible, in which the energy requirement of the device according to the invention compared to the first Operating mode and the state of the art is significantly reduced.
  • the air-operated mode is suitable for the floating guiding of sheets whose side facing the guide surface is printed or has a sensitive surface (e.g. aluminum-clad). If the side of the sheet facing the guide surface is of secondary importance (e.g. unprinted), the sheet is sucked against the guide surface in suction air mode. This eliminates the blown air requirement of the guide surface, which enables considerable energy savings.
  • the air volume for the blow box with its impact jet nozzles is changed only slightly.
  • the device according to the invention is in the drawing shown and is described in more detail below.
  • a processing machine e.g. B. Rotary printing machine
  • Fig. 1 sheet 1 or tracks along a closed guide surface 2 funded.
  • This closed guide surface 2 is an upper part of an air supply box 3 and with a variety of slot nozzles 4, one Guide surface 6 lowered obliquely into the guide surface 2 have provided (Fig. 2 and Fig. 3).
  • Will this Air supply box 3 supplied with blown air, see above generate these slot nozzles 4 each in the Wide divergent air jet 7, which along the Guide surface 2 runs, d. H. on the leadership surface 2 sweeps along.
  • Through these air jets 7 an air cushion 8 is generated on the guide surface 2, by means of simultaneous blowing / suction (hydrodynamic paradox) carries bow 1 and sucks.
  • After leaving a short blow-out duct 18 leads the fan 13 to the air supply box 11 of the impact jet nozzles 12 to keep the flow losses low, so that about 500 Pa to at the impact jet nozzles 12 2000 Pa are optionally available.
  • This Blow-out duct 18 branches off a supply duct 19 for the Air supply box 3 from the guide surface 2.
  • This Supply channel 19 is via a connecting channel 21 connected to the intake duct 17 of the fan 13.
  • the air supply box 3 for the slot nozzles 4 and the air supply box 11 for the impact jet nozzles 12 thus have a common air supply 20 from fan 13, intake duct 17, exhaust duct 18, Supply channel 19 and connecting channel 21.
  • a optionally adjustable throttle device 22 In the supply channel 19 is between the Connection channel 21 and the blow-out channel 18 a optionally adjustable throttle device 22.
  • One each further optionally adjustable throttle device 23, 24 is both in the connecting channel 21 and Intake duct 17 between the opening 16 and the Connection channel 21 arranged.
  • a first operating mode - the air and Drying operation - the device according to the invention the slot nozzles 4 of the guide surface 2 from below pressurized with compressed air and so the sheet 1 on one Air cushion 8 worn.
  • the supply channel 19 of the Air supply box 3 with the blow-out duct 18 of the Fan 13 connected and the connecting channel 21 to Intake duct 17 closed which by opening the Throttle device 22 and closing the Throttle device 23 happens.
  • the air pressure e.g. B. 200 Pa, in Air supply box 3 of the slot nozzles 4 changed.
  • the throttle device 24 in the intake duct 17 is complete open.
  • they are Throttle devices 22, 23, 24 as adjustable flaps are carried out and are not shown Pneumatic cylinder moves.
  • the open position will specified via an adjustable stop.
  • Air pressure in the air supply box 3 can be variable, can known positioning devices or Control devices such as servomotors, servo cylinders, the either move to a defined position or via a pressure sensor can be controlled.
  • a fan 13 is preferably used, whose characteristic curve is an almost constant pressure with a variable delivery rate.
  • the power consumption of the fan 13 proportional to the flow rate.
  • the device according to the invention is a fan 13 with a total pressure increase of 1000 - 3000 Pa suitable.
  • the properties are met Drum centrifugal fan.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Advancing Webs (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Führen von Bogen über eine durchgehende Führungsfläche in einer Verarbeitungsmaschine gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a device for guiding of arches over a continuous guide surface in a processing machine according to the preamble of Claim 1.

Aus der DE-PS 19 07 083 ist ein Blaskasten zum schwebenden Führen von Bogen bekannt, in dem Blasöffnungen mit einer abgesenkten Leitfläche angebracht sind. Durch aus diesen Blasöffnungen austretenden Luftstrahlen wird der Bogen auf einem Luftpolster geführt. Nachteilig ist hier, daß diese Einrichtung nicht mit Saugluft beaufschlagbar ist und daß mit diesen Düsen kein gerichteter Strahl erzeugt werden kann.From DE-PS 19 07 083 is a blow box for floating leading bow known in the Blow openings with a lowered guide surface are attached. Through from these blow holes escaping air jets the bow is on a Air cushion led. The disadvantage here is that this Device can not be acted upon with suction air and that no directed jet is produced with these nozzles can be.

Die DE-PS 34 11 029 beschreibt eine durchgehende Führungsflache mit Luftdüsen, die als Bohrungen ausgebildet sind. Die Luftdüsen sind wahlweise als Blas- oder Saugdüsen betreibar. Nachteilig an diesen Düsen ist, daß im Blasbetrieb keine Saugwirkung entsteht und keine gerichtete Kraft zum Straffen des Bogens erzeugt werden kann.DE-PS 34 11 029 describes a continuous Guide surface with air nozzles that act as bores are trained. The air nozzles are optionally available as Blow or suction nozzles can be operated. A disadvantage of this Nozzle is that there is no suction effect in the blowing mode and no directional force to tighten the bow can be generated.

Beide Ausführungen haben keine Einrichtung, die einen Bogen mittels eines zweiten Luftpolsters an einer Oberseite einspannt und mit der eine Trocknung des Bogens erfolgen kann.Neither version has one facility Bow by means of a second air cushion on one Clamped top and with a drying of the Can be done.

Eine Fördereinrichtung für Bogen mit zwei übereinander angeordneten Führungsflächen zeigt die DE-PS 34 43 704. Diese Führungsflächen sind mit Bohrungen versehen, die als Luftdüsen verwendet werden. Der Bogen wird zwischen zwei Luftpolstern eingespannt. Nachteilig ist hierbei, daß der Bogen in einer undefinierten Lage zwischen diesen Luftpolstern schwebt und somit leicht zum Flattern neigt.
Diese Luftdüsen werden über eine große Anzahl von Ventilatoren versorgt, was einen großen Regel- und Installationsaufwand bedingt.DE-PS 34 43 704 shows a conveyor device for sheets with two guide surfaces arranged one above the other. These guide surfaces are provided with bores which are used as air nozzles. The bow is clamped between two air cushions. The disadvantage here is that the sheet hovers in an undefined position between these air cushions and thus tends to flutter slightly.
These air nozzles are supplied by a large number of fans, which requires a great deal of control and installation work.

Die DE-PS 14 49 656 beschreibt eine Vorrichtung zum flatterfreien Führen von Flachmaterial. Hierbei sind mit Schlitzdüsen versehene Blaskästen zum Führen von Flachmaterial vorgesehen, denen gegenüberliegend Blaskästen mit senkrecht austretenden Blasstrahlen zum Trocknen angeordnet sind.
Nachteilig ist hierbei, daß keine durchgehende Führungsfläche vorhanden ist und somit das Flachmaterial zu Wellenbildung neigt. Zudem ist auch bei nur einseitig bedruckten Bogen der Energieaufwand zum Führen der Bogen hoch.DE-PS 14 49 656 describes a device for flutter-free guiding of flat material. In this case, blow boxes provided with slot nozzles are provided for guiding flat material, and blow boxes with vertically emerging blowing jets are arranged opposite for drying.
The disadvantage here is that there is no continuous guide surface and thus the flat material tends to form waves. In addition, even with sheets printed on only one side, the energy expenditure for guiding the sheets is high.

Der Erfindung liegt die Aufgabe zugrunde eine Vorrichtung zum Führen von frisch beschichteten Bogen entlang einer Führungsfläche in einer Verarbeitungsmaschine, vorzugsweise Rotationsdruckmaschine, mit wahlweise zwei Betriebsarten zu schaffen, wobei in einer ersten Betriebsart "Tragluft- und Trocknungsbetrieb" ein Luftversorgungskasten der Führungsfläche und ein Luftversorgungskasten für Prallstrahldüsen mit Druckluft beaufschlagt werden kann und wobei in einer zweiten Betriebsart "Saugluft- und Trocknungsbetrieb" der Energiebedarf, und damit die Betriebskosten, der erfindungsgemäßen Vorrichtung im Vergleich zum stand der Technik erheblich reduziert werden kann, ohne die Trocknung wesentlich zu beeinflussen.The invention is based on the object Device for guiding freshly coated sheets along a guide surface in a Processing machine, preferably Rotary printing machine, optionally with two operating modes to create, being in a first mode "Air and drying operation" Air supply box of the guide surface and a Air supply box for impact jet nozzles with compressed air can be applied and in a second Operating mode "suction air and drying mode" of the Energy requirements, and thus the operating costs, of Device according to the invention compared to the state of the Technology can be significantly reduced without that To influence drying significantly.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des kennzeichnenden Teils des Patentanspruches 1 gelöst.This object is achieved by the features of the characterizing part of claim 1 solved.

Die mit der Erfindung erzielbaren Vorteile bestehen insbesondere darin, daß zusätzlich zu einer ersten Betriebsart - dem Tragluft- und Trocknungsbetrieb - eine zweite Betriebsart - der Saugluft- und Trocknungsbetrieb - der erfindungsgemäßen Vorrichtung möglich ist, bei der der Energiebedarf der erfindungsgemäßen Vorrichtung im Vergleich zur ersten Betriebsart und zum Stand der Technik wesentlich verringert wird. Der Tragluftbetrieb ist zum schwebenden Führen von Bogen geeignet, deren der Führungsfläche zugewandte Seite bedruckt ist oder eine empfindliche Oberfläche (z. B aluminiumkaschiert) hat.
Hat die der Führungsfläche zugewandte Seite des Bogens untergeordnete Bedeutung (z. B. unbedruckt), wird im Saugluftbetrieb der Bogen gegen die Führungsfläche gesaugt. Hiermit entfällt der Blasluftbedarf der Führungsfläche, womit eine erhebliche Energieersparnis möglich ist.
Durch die Umschaltung zwischen den beiden Betriebsarten wird die Luftmenge für den Blaskasten mit seinen Prallstrahldüsen nur unwesentlich verändert.The advantages that can be achieved with the invention are, in particular, that in addition to a first mode of operation - the air and drying mode - a second mode of operation - the suction air and drying mode - of the device according to the invention is possible, in which the energy requirement of the device according to the invention compared to the first Operating mode and the state of the art is significantly reduced. The air-operated mode is suitable for the floating guiding of sheets whose side facing the guide surface is printed or has a sensitive surface (e.g. aluminum-clad).
If the side of the sheet facing the guide surface is of secondary importance (e.g. unprinted), the sheet is sucked against the guide surface in suction air mode. This eliminates the blown air requirement of the guide surface, which enables considerable energy savings.
By switching between the two operating modes, the air volume for the blow box with its impact jet nozzles is changed only slightly.

Durch die Kombination Schwebeführung und Blaskasten mit Prallstrahldüsen (Prallstrahltrockner) kann eine definierte Bogenführungsebene geschaffen werden, d. h. der Bogen kann im geringen Abstand zur Führungsfläche geführt werden. Es werden in vorteilhafter Weise Prallstrahldüsen eingesetzt, da diese auch in einer größeren Entfernung gute Trockenwirkung Zeigen. Dadurch ist es möglich, den Blaskasten mit den Prallstrahldüsen und die Führungsfläche in einem großen Abstand anzuordnen, daß die Bogen in vorteilhafter Weise mittels Kettenförderern bewegt werden können.Through the combination of hover guide and blow box with impact jet nozzles (impact jet dryer) defined sheet guiding plane are created, d. H. the arch can be a short distance from the guide surface be performed. It will be advantageous Impact jet nozzles are used because they are also in one Show good drying effect over longer distances. Thereby it is possible to blow the blow box with the baffle nozzles and the guide surface at a large distance to arrange that the bow in an advantageous manner Chain conveyors can be moved.

Die erfindungsgemäße Vorrichtung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.The device according to the invention is in the drawing shown and is described in more detail below.

Es zeigen

Fig. 1
eine schematische Ansicht der erfindungsgemäßen Vorrichtung längs der Förderrichtung,
Fig. 2
einen Ausschnitt einer Führungsfläche mit einer Schlitzdüse im Draufsicht,
Fig. 3
einen Schnitt des in Fig. 2 dargestellten Ausschnittes,
Fig. 4
einen schematischen Schnitt der erfindungsgemäßen Vorrichtung quer zur Förderrichtung im Tragluft- und Trocknungsbetrieb,
Fig. 5
den in Fig. 2 dargestellten Schnitt im Saugluft- und Trocknungsbetrieb.
Show it
Fig. 1
2 shows a schematic view of the device according to the invention along the conveying direction,
Fig. 2
a section of a guide surface with a slot nozzle in plan view,
Fig. 3
3 shows a section of the detail shown in FIG. 2,
Fig. 4
2 shows a schematic section of the device according to the invention transversely to the conveying direction in the air and drying mode
Fig. 5
the section shown in Fig. 2 in suction and drying mode.

In einer Verarbeitungsmaschine, z. B. Rotationsdruckmaschine, werden entsprechend Fig. 1 Bogen 1 oder Bahnen entlang einer geschlossenen Führungsfläche 2 gefördert. Diese geschlossene Führungsfläche 2 ist ein oberer Teil eines Luftversorgungskastens 3 und mit einer Vielzahl von Schlitzdüsen 4, die eine schräg in die Führungsfläche 2 abgesenkte Leitfläche 6 aufweisen, versehen (Fig. 2 und Fig. 3). Wird dieser Luftversorgungskasten 3 mit Blasluft versorgt, so erzeugen diese Schlitzdüsen 4 jeweils einen in die Breite divergierenden Luftstrahl 7, der entlang der Führungsfläche 2 verläuft, d. h. auf der Führungsfläche 2 entlangstreicht. Durch diese Luftstrahlen 7 wird ein Luftpolster 8 auf der Führungfläche 2 erzeugt, das mittels gleichzeitiger Blas- / Saugwirkung (hydrodynamisches Paradoxon) die Bogen 1 trägt und ansaugt. Jeweils einer frisch bedruckten Seite 9 der Bogen 1 zugewandt und der Führungsfläche 2 in einem Abstand a, z. B. 100 mm, gegenüberliegend, ist ein weiterer Luftversorgungskasten 11 angeordnet, der mit Prallstrahldüsen 12 versehen ist, deren Luftstrahl 10 annähernd senkrecht auf die frisch bedruckte Seite 9 der Bogen 1 treffen und diese trocknen. Die für diese beiden Luftversorgungskästen 3, 11 benötigte Luft wird von einem zentral angeordneten gemeinsamen Ventilator 13 beschleunigt. Diese beiden Luftversorgungskästen 3, 11 sind,- wie auch aus Fig. 2 ersichtlich -, in einem annähernd geschlossenen Raum 14 angeordnet, der nur jeweils stirnseitig Öffnungen für die Bogenpassage aufweist. An einer zentralen Stelle 16 des geschlossenen Raumes 14 - z. B. mittig in seiner linken Seite - wird über eine Öffnung 16 Luft für einen Ansaugkanal 17 des Ventilators 13 entnommen. Im Ventilator 13 wird die Luft derart beschleunigt, so daß nach Austritt aus dem Ventilator 13 ein Überdruck der Luft von wahlweise 500 Pa bis 2000 Pa entsteht. Nach dem Austritt aus dem Ventilator 13 führt ein kurzer Ausblaskanal 18 zu den Luftversorgungskasten 11 der Prallstrahldüsen 12, um die Strömungsverluste gering zuhalten, so daß an den Prallstrahldüsen 12 auch ungefähr 500 Pa bis 2000 Pa wahlweise zur Verfügung stehen. Von diesem Ausblaskanal 18 zweigt ein Versorgungskanal 19 für den Luftversorgungskasten 3 der Führungsfläche 2 ab. Dieser Versorgungskanal 19 ist über einen Verbindungskanal 21 mit dem Ansaugkanal 17 des Ventilators 13 verbunden. Der Luftversorgungskasten 3 für die Schlitzdüsen 4 und der Luftversorgungskasten 11 für die Prallstrahldüsen 12 haben somit eine gemeinsame Luftversorgung 20 bestehend aus Ventilator 13, Ansaugkanal 17, Ausblaskanal 18, Versorgungskanal 19 und Verbindungskanal 21.In a processing machine, e.g. B. Rotary printing machine, are according to Fig. 1 sheet 1 or tracks along a closed guide surface 2 funded. This closed guide surface 2 is an upper part of an air supply box 3 and with a variety of slot nozzles 4, one Guide surface 6 lowered obliquely into the guide surface 2 have provided (Fig. 2 and Fig. 3). Will this Air supply box 3 supplied with blown air, see above generate these slot nozzles 4 each in the Wide divergent air jet 7, which along the Guide surface 2 runs, d. H. on the leadership surface 2 sweeps along. Through these air jets 7 an air cushion 8 is generated on the guide surface 2, by means of simultaneous blowing / suction (hydrodynamic paradox) carries bow 1 and sucks. One freshly printed page 9 each Arch 1 facing and the guide surface 2 in one Distance a, z. B. 100 mm, opposite, is a another air supply box 11 arranged with Impact jet nozzles 12 is provided, the air jet 10th almost perpendicular to the freshly printed page 9 hit the sheet 1 and dry it. The one for this air supply boxes 3, 11 required air from a centrally located common fan 13 accelerates. These two air supply boxes 3, 11 are, as can also be seen from FIG. 2, in one arranged approximately closed space 14, the only Openings for the arc passage on each end having. At a central point 16 of the closed Room 14 - e.g. B. middle in his left side - air 16 for an intake duct via an opening 17 of the fan 13 removed. In the fan 13 the air accelerates so that after exiting the fan 13 an overpressure of the air of optional 500 Pa to 2000 Pa is created. After leaving a short blow-out duct 18 leads the fan 13 to the air supply box 11 of the impact jet nozzles 12 to keep the flow losses low, so that about 500 Pa to at the impact jet nozzles 12 2000 Pa are optionally available. Of this Blow-out duct 18 branches off a supply duct 19 for the Air supply box 3 from the guide surface 2. This Supply channel 19 is via a connecting channel 21 connected to the intake duct 17 of the fan 13. The air supply box 3 for the slot nozzles 4 and the air supply box 11 for the impact jet nozzles 12 thus have a common air supply 20 from fan 13, intake duct 17, exhaust duct 18, Supply channel 19 and connecting channel 21.

Im Versorgungskanal 19 befindet sich zwischen dem Verbindungskanal 21 und dem Ausblaskanal 18 eine wahlweise einstellbare Drosseleinrichtung 22. Je eine weitere wahlweise einstellbare Drosseleinrichtung 23, 24 ist sowohl im Verbindungskanal 21 als auch im Ansaugkanal 17 zwischen der Öffnung 16 und dem Verbindungskanal 21 angeordnet.In the supply channel 19 is between the Connection channel 21 and the blow-out channel 18 a optionally adjustable throttle device 22. One each further optionally adjustable throttle device 23, 24 is both in the connecting channel 21 and Intake duct 17 between the opening 16 and the Connection channel 21 arranged.

In einer ersten Betriebsart - dem Tragluft- und Trocknungsbetrieb - der erfindungsgemäßen Vorrichtung werden die Schlitzdüsen 4 der Führungsfläche 2 von unten mit Druckluft beaufschlagt und so die Bogen 1 auf einem Luftpolster 8 getragen. Hierzu wird der Versorgungskanal 19 des Luftversorgungskastens 3 mit dem Ausblaskanal 18 des Ventilators 13 verbunden und der Verbindungskanal 21 zum Ansaugkanal 17 verschlossen, was durch Öffnen der Drosseleinrichtung 22 und Schließen der Drosseleinrichtung 23 geschieht. Durch Variieren der geöffneten Stellung der Drosseleinrichtung 22 mittels nichtdargestellter, z. B. fernverstellbarer Postionierantriebe, mit z. B. elekromotorischen Antrieb, wird der Luftdruck, z. B. 200 Pa, im Luftversorgungskasten 3 der Schlitzdüsen 4 verändert. Die Drosseleinrichtung 24 im Ansaugkanal 17 ist ganz geöffnet. Im vorliegenden Beispiel sind die Drosseleinrichtungen 22, 23, 24 als verstellbare Klappen ausgeführt und werden über nichtdargestellte Pneumatikzylinder bewegt. Die geöffnete Stellung wird über einen einstellbaren Anschlag vorgegeben. Soll der Luftdruck im Luftversorgungskasten 3 variabel sein, können bekannte Positioniereinrichtungen oder Regeleinrichtungen wie Servomotore, Servozylinder, die entweder eine definierte Stellung anfahren oder über einen Drucksensor gesteuert werden, verwendet werden.In a first operating mode - the air and Drying operation - the device according to the invention the slot nozzles 4 of the guide surface 2 from below pressurized with compressed air and so the sheet 1 on one Air cushion 8 worn. For this purpose, the supply channel 19 of the Air supply box 3 with the blow-out duct 18 of the Fan 13 connected and the connecting channel 21 to Intake duct 17 closed, which by opening the Throttle device 22 and closing the Throttle device 23 happens. By varying the open position of the throttle device 22 by means of not shown, e.g. B. remotely adjustable Postionierantriebe, with z. B. electric drive, the air pressure, e.g. B. 200 Pa, in Air supply box 3 of the slot nozzles 4 changed. The throttle device 24 in the intake duct 17 is complete open. In the present example they are Throttle devices 22, 23, 24 as adjustable flaps are carried out and are not shown Pneumatic cylinder moves. The open position will specified via an adjustable stop. Should he Air pressure in the air supply box 3 can be variable, can known positioning devices or Control devices such as servomotors, servo cylinders, the either move to a defined position or via a pressure sensor can be controlled.

Werden in einer zweiten Betriebsart - dem Saugluft- und Trocknungsbetrieb - die Schlitzdüsen 4 der Führungsfläche 2 mit Saugluft, z. B. 50 Pa, beaufschlagt, wird der Versorgungskanal 19 mit dem Ansaugkanal 17 durch Öffnen der Drosseleinrichung 23 verbunden und die Verbindung zum Ausblaskanal 18 durch Schließen der Drosseleinrichtung 22 verschlossen, was über die beschriebenen Positionierantriebe erfolgt. Hierdurch wird die Fördermenge des Ventilators 13 um die Blasluftmenge der Schlitzdüsen 4 der Führungsfläche 2 im Vergleich zum Tragluft- und Trocknungsbetrieb verringert, so daß damit auch die Leistungsaufnahme des Ventilators 13 sinkt. Are in a second operating mode - the suction air and Drying operation - the slot nozzles 4 of the Guide surface 2 with suction air, for. B. 50 Pa, acted upon, the supply channel 19 with the Intake duct 17 by opening the throttle device 23 connected and the connection to the blow-out duct 18 through Closing the throttle device 22 closed what via the positioning drives described. As a result, the delivery rate of the fan 13 to the Blown air quantity of the slot nozzles 4 of the guide surface 2 in Comparison to air and drying operation reduced, so that the power consumption of the Fan 13 sinks.

Um die gewünschte Menge Blasluft der Prallstrahldüsen 12 sowohl im Tragluft- als auch im Saugluftbetrieb konstant zu halten, wird über die Drosseleinrichtung 23 des Verbindungskanals 21 der Unterdruck im Luftversorgungskasten 3 eingestellt und mittels der Drosseleinrichtung 24 die Luftmenge im Luftversorgungskasten 11 gesteuert. Damit bei der Steuerung der Luftmenge über Drosseleinrichtungen 22, 23, 24 der Luftdruck annähernd konstant bleibt, wird vorzugsweise ein Ventilator 13 verwendet, dessen Kennlinie einen annähernd konstanten Druck bei veränderlicher Fördermenge aufweist. Hierbei ist die Leistungsaufnahme des Ventilators 13 proportional der Fördermenge. Zum sicheren Betrieb der erfindungsgemäßen Vorrichtung ist ein Ventilator 13 mit einer Totaldruckerhöhung von 1000 - 3000 Pa geeignet. Die Eigenschaften erfüllt beispielsweise ein Trommelläuferradialventilator. To the desired amount of air blown from the impact jet nozzles 12 in both air and vacuum mode to keep constant is via the throttle device 23 of the connecting channel 21, the negative pressure in Air supply box 3 set and by means of the throttle device 24, the amount of air in Air supply box 11 controlled. So with the Control of the air volume via throttle devices 22, 23, 24 the air pressure remains approximately constant, a fan 13 is preferably used, whose characteristic curve is an almost constant pressure with a variable delivery rate. Here is the power consumption of the fan 13 proportional to the flow rate. For safe operation the device according to the invention is a fan 13 with a total pressure increase of 1000 - 3000 Pa suitable. For example, the properties are met Drum centrifugal fan.

TeilelisteParts list

11
Bogenbow
22nd
Führungsfläche, geschlosseneLeadership area, closed
33rd
Luftversorgungskasten (4)Air supply box (4)
44th
SchlitzdüsenSlot nozzles
55
LuftstrahlAir jet
66
Leitfläche (4)Guide surface (4)
77
Luftstrahl (4)Air jet (4)
88th
LuftpolsterAir cushion
99
Seite, frisch bedruckte (1)Page, freshly printed (1)
1010th
--
1111
Luftversorgungskasten (12)Air supply box (12)
1212th
PrallstrahldüsenImpact jet nozzles
1313
Ventilatorfan
1414
Raum, geschlossenRoom, closed
1515
--
1616
Öffnungopening
1717th
Ansaugkanal (13)Intake duct (13)
1818th
Ausblaskanal (13)Exhaust duct (13)
1919th
Versorgungskanal (3)Supply channel (3)
2020th
LuftversorgungAir supply
2121
VerbindungskanalConnecting channel
2222
Drosseleinrichtung (19)Throttle device (19)
2323
Drosseleinrichtung (21)Throttle device (21)
2424th
Drosseleinrichtung (17)Throttle device (17)
FF
Förderrichtung Direction of conveyance
aa
Abstanddistance

Claims (5)

  1. Device for guiding sheets in a processing machine, preferably a rotary printing machine, over a guide surface of a first air-supply box, which is provided with slot nozzles, which in each case have a bevelled guide face that is recessed into the guide surface, and a second air-supply box, which is located opposite the first air-supply box and has deflector-jet nozzles oriented in the direction of the guide surface, it being the case that, in a first mode of operation "carrying air and drying operation" for the non-contact guidance of sheets, a stable air cushion is formed between sheet and guide surface by applying compressed air to the first air-supply box, characterized in that, in a second mode of operation "suction air and drying operation", the first air-supply box (3) has suction applied to it, so that the slot nozzles (4) act as suction nozzles, in that the second air-supply box (11) and the first air-supply box (3) have a common air supply (20), in that the air supply (20) is provided by means of a fan (13), whose characteristic curve exhibits an approximately constant pressure with a variable volume flow and whose power uptake is approximately proportional to the delivery rate.
  2. Device according to Claim 1, characterized in that a supply duct (19) of the first air-supply box (3) is arranged so that it can optionally be connected to an intake or blowing duct (17, 18) of the fan (13).
  3. Device according to Claim 2, characterized in that throttling devices (22, 23, 24) in the supply and connecting ducts (19, 21) of the first air-supply box (3) of the slot nozzles (4) and in the intake duct (17) of the fan (13) are arranged so that they can be adjusted by means of positioning devices.
  4. Device according to Claim 1, characterized in that a throttling device (24) is arranged in the intake duct (17) of the fan (13).
  5. Device according to Claim 1, characterized in that the fan (13) is a drum-rotor radial fan.
EP95910425A 1994-03-03 1995-03-01 Process for guiding freshly coated sheets Expired - Lifetime EP0748283B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4406844 1994-03-03
DE4406844A DE4406844C2 (en) 1994-03-03 1994-03-03 Device for guiding freshly coated sheets
PCT/DE1995/000260 WO1995023701A1 (en) 1994-03-03 1995-03-01 Process for guiding freshly coated sheets

Publications (2)

Publication Number Publication Date
EP0748283A1 EP0748283A1 (en) 1996-12-18
EP0748283B1 true EP0748283B1 (en) 1998-09-02

Family

ID=6511632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95910425A Expired - Lifetime EP0748283B1 (en) 1994-03-03 1995-03-01 Process for guiding freshly coated sheets

Country Status (5)

Country Link
US (1) US5915304A (en)
EP (1) EP0748283B1 (en)
JP (1) JP2776990B2 (en)
DE (2) DE4406844C2 (en)
WO (1) WO1995023701A1 (en)

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Also Published As

Publication number Publication date
US5915304A (en) 1999-06-29
DE59503429D1 (en) 1998-10-08
JP2776990B2 (en) 1998-07-16
JPH09510408A (en) 1997-10-21
DE4406844A1 (en) 1995-09-07
DE4406844C2 (en) 1997-05-07
EP0748283A1 (en) 1996-12-18
WO1995023701A1 (en) 1995-09-08

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