EP0780332A2 - Device for acting on sheets in a sheet delivery apparatus - Google Patents

Device for acting on sheets in a sheet delivery apparatus Download PDF

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Publication number
EP0780332A2
EP0780332A2 EP96117816A EP96117816A EP0780332A2 EP 0780332 A2 EP0780332 A2 EP 0780332A2 EP 96117816 A EP96117816 A EP 96117816A EP 96117816 A EP96117816 A EP 96117816A EP 0780332 A2 EP0780332 A2 EP 0780332A2
Authority
EP
European Patent Office
Prior art keywords
sheet
air
acting
tensioner
deformation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96117816A
Other languages
German (de)
French (fr)
Other versions
EP0780332A3 (en
EP0780332B1 (en
Inventor
Richard Mack
Bernhard Waltenberger
Bernd Stephan
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0780332A2 publication Critical patent/EP0780332A2/en
Publication of EP0780332A3 publication Critical patent/EP0780332A3/en
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Publication of EP0780332B1 publication Critical patent/EP0780332B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/68—Reducing the speed of articles as they advance
    • B65H29/686—Pneumatic brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/52—Stationary guides or smoothers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
    • 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
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • the invention relates to a device for acting on sheets in a sheet delivery of a printing press, in which sheets can be printed either on one side or on both sides.
  • a sheet straightener is provided for removing curls from the sheets when printing on one side and a guiding device for contact-free guidance of the sheets when printing on both sides.
  • the sheet straightener is fixed in place on the machine frame in a position set back with respect to the guide path of the guide device, and a guide element in the form of a plate is provided which is used to cover the sheet straightener on both sides. Pressure in the space between sheet guide plate and sheet straightener is movable.
  • the invention has for its object a sheet smoothing device integrated into the sheet conveying plane train that this can be easily brought into the cleaning position and do not smear the sheets in straight printing and in perfecting.
  • the integration of the surface of the sheet tensioner in the sheet conveying plane enables largely trouble-free sheet transport in one-sided and two-sided printing.
  • the flushing in of an air cushion ensures that the sheet is guided without lubrication, without peripherally mounted cover elements first having to be pivoted into the conveying plane.
  • the storage of the sheet tensioner with snap locks at four points guarantees problem-free pivoting or removal of the sheet tensioner in just a few steps.
  • the air is advantageously flushed in from one of the adjacent guide plates of the sheet conveying plane.
  • the adjacent baffles on the sheet conveying level are pressurized with compressed air at a low pressure level.
  • the bow tensioner according to the invention comprises domed deformation regions which are designed opposite one another.
  • the deformation areas can be provided with individual air nozzles, which extend in rows across the width of the sheet boom.
  • One of the deformation areas of the sheet tensioner is acted upon by suction air, while the opposite second deformation area can be acted upon by compressed air.
  • the pressure level for suction or blown air for the two deformation areas mentioned on the sheet tensioner is somewhat higher than the pressure level in the sheet conveying plane.
  • the air nozzles which are arranged in a row next to one another, are provided in the lower region of the first deformation region of the sheet tensioner, while the row of air nozzles in the second deformation region is designed to be somewhat higher in this region.
  • the bow tensioner is equipped with snap locks, with which it can be locked in or removed from the side walls in a few simple steps.
  • the first deformation area of the sheet tensioner seen in the sheet travel direction is acted upon by suction air, while the second deformation area of the sheet tensioner viewed in the sheet travel direction is subjected to blowing air.
  • a sheet tensioner 6 which is received in the sheet conveying plane, the guide plates 1 and 2.
  • the parts of the sheet conveying plane 1 or 2 are provided with a large number of air jets 3 which guide air jets in different directions and are formed from individual profiles 14 which delimit cavities 4 and 5, respectively.
  • a sheet tensioner 6 is mounted between an edge 15 of the sheet conveying plane 1 and the opposite edge of the sheet conveying plane 2. This is mounted by means of 7 and 8 designated locking pins or brackets in side walls, not shown here, of the sheet delivery of the printing press.
  • the sheet tensioner 6 comprises a first deformation area 11, as seen in the sheet running direction 18, and a second deformation area 12, both of which have a curved surface.
  • the bow tensioner 6 is laterally delimited by two boundary walls 10.
  • Reference number 9 denotes a connection for the air supply to the sheet tensioner.
  • a gap has remained between the downwardly tapering surfaces of the deformation regions 11 and 12, through which the deformation regions 11 and 12 are separated from one another.
  • FIG. 2 shows a top view of the sheet tensioner 6 received between the guide plates 1 and 2.
  • the baffles 1 and 2 which are also locked here only schematically with bearings in the side walls 17, are provided with a large number of air nozzles 3.
  • the individual nozzles are arranged symmetrically to the center of the conveying plane 21.
  • Reference number 3 denotes a nozzle group from which air jets emerge oriented in the lateral direction.
  • the air nozzles can be arranged perpendicular to the center of the conveying plane 21 or in a 15 °, 30 °, 45 ° orientation or any blowing angle orientation steps, gradually rotated relative to one another. With 20 a group of air nozzles is designated, which generates strictly laterally oriented air jets.
  • a first row of nozzles 16 opposite the first deformation area 11 of the sheet tensioner 6 is formed on the front edge of the guide plate 1.
  • the air flow which flushes in the air cushion over the deformation areas 11 and 12 of the sheet tensioner 6, can emerge from the latter in the case of pure face printing and in the perfecting mode, ie if the contact of the already printed underside with the stationary surfaces of the sheet tensioner 6 is to be avoided. Since cornering can also result in greasing when the printing is face-up, flushing in an air cushion is also useful in this operating mode.
  • the air cushion which is generated by the first row of nozzles 16, reaches up to the guide plate 2, on which the laterally blowing nozzles 19, which are subjected to blowing air of a lower pressure level, exert a laterally tightening effect on the sheets 13 to be conveyed becomes.
  • the deformation areas 11 and 12 are shown viewed from above. These are each with two brackets 7 and 8 in the side walls 17 of the sheet delivery of the printing press stored.
  • the brackets can be provided with spring locking bolts, with the tensioner 6 being released by simply pulling the bolts inwards.
  • the sheet tensioner 6 could also be held in position by the brackets 7 and 8 and released by pressing from the operating side onto the opposite pair of brackets 7 and 8 on the operating side and then simply unhooked thereafter; it is also possible to pivot the sheet tensioner 6 after pulling only two brackets 7 and 8.
  • the two sheet guide plates 1 and 2 are provided with a large number of air nozzles 3 oriented in different directions.
  • Both baffles 1 and 2 are each provided with a blower 26 or 29, whereby low-pressure air of a pressure level, for example between 5 and 20 mbar, is introduced into the cavities below these baffles.
  • the deformation areas 11, 12 of the sheet tensioner 6 are acted upon by blowing or suction air of a higher pressure level.
  • the first deformation area 11, seen in the direction of sheet travel 18, is subjected to suction air with a negative pressure of, for example, approximately 80 mbar and is provided with a row of suction nozzles 23 in its lower area.
  • the second deformation region 12 opposite the first deformation region 11 is provided with a row of blowing nozzles 22 and is supplied with blowing air at a pressure level between 100 and 250 mbar.
  • the first deformation region 11 is consequently connected to a vacuum source 28, the second deformation region 12 to a blower.
  • this gusset is bridged between the two deformation areas 11 and 12, so that the already printed underside of the sheet 13 does not come into contact with the surfaces of the sheet tensioner 6 during perfecting and printing.
  • an air cushion carrying the sheet 13 can be produced by the sheet guide plates 1 and 2 before it passes the sheet tensioner 6.
  • the sheet is then smoothed by the action of blown air 25 on its upper side above the gap 24, contact of the sheet 13 with the surfaces of the deformation regions 11 and 12 being less critical, but turning the sheet 13 there and thus lubricating it can come.
  • Fig. 4 the process of bow tightening when passing the bow tightener is shown schematically.
  • an air cushion 31 is created under the straight area of the curve 13 above the guide plates 1 and 2.
  • the arch 13 is tightened by deforming the arch 13 by blowing air 25 from above when it is above the gusset of the gap 24.
  • the arch 13 conforms to the contour of the first and second deformation areas 11, 12 of the arch tensioner 6. The action of blowing and suction air on the rows of nozzles 22 and 23 prevents the arc 13 from being immersed by generating an opposing air flow into the gap 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Advancing Webs (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Discharge By Other Means (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Abstract

The equipment is for a press printing sheets on one or both sides. he sheet-stretching mechanism (6) has a top surface in the plane in which adjacent sheet-conveyors (1, 2) work, also holders (7, 8) for printing on one or both sides. Its surface is flushed by an air cushion generated by adjacent jet nozzles (3). The latter can be in the adjacent conveyor surfaces. The latter can be exposed to low-pressure air, and the stretching mechanism can incorporate distortion areas (11, 12) opposite each other.

Description

Die Erfindung betrifft eine Vorrichtung zur Einwirkung auf Bogen in einem Bogenausleger einer Druckmaschine, in der Bogen wahlweise einseitig oder zweiseitig bedruckt werden können.The invention relates to a device for acting on sheets in a sheet delivery of a printing press, in which sheets can be printed either on one side or on both sides.

DE 44 27 897 C1 offenbart bereits eine Vorrichtung zur Einwirkung auf einen Bogen. Es ist ein Bogenglätter zur Entwellung der Bogen bei einseitigem Druck und eine Leitvorrichtung zur berührungsfreien Führung der Bogen bei beidseitigem Druck vorgesehen. Der Bogenglätter ist ortsfest am Maschinengestell in einer in Bezug auf die Führungsbahn der Leitvorrichtung zurückgesetzten Position angebracht und es ist ein Leitelement in Form einer Platte vorgesehen, die zur Abdeckung des Bogenglätters bei beidseitige. Druck in den Freiraum zwischen Bogenleitblech und Bogenglätter bewegbar ist.DE 44 27 897 C1 already discloses a device for acting on an arch. A sheet straightener is provided for removing curls from the sheets when printing on one side and a guiding device for contact-free guidance of the sheets when printing on both sides. The sheet straightener is fixed in place on the machine frame in a position set back with respect to the guide path of the guide device, and a guide element in the form of a plate is provided which is used to cover the sheet straightener on both sides. Pressure in the space between sheet guide plate and sheet straightener is movable.

Zum Verschwenken der Platte, die den Bogenglätter bei beidseitigem Druck abdeckt, ist eine Stellzylindereinheit erforderlich, der die Auswechselbarkeit des Bogenglätters - etwa zu Reinigungszwecken - behindert. Ferner ist nur bei beidseitigem Druck eine ebene Bogenförderfläche gegeben, bei einseitigem Druck bildet der Bogenglätter eine Vertiefung, eine Mulde in der Bogenförderebene, die für die Gleichmäßigkeit der Bogenförderung nicht von Vorteil ist.To pivot the plate, which covers the sheet straightener when printing on both sides, an actuating cylinder unit is required, which hinders the interchangeability of the sheet straightener - for cleaning purposes, for example. Furthermore, only with double-sided printing there is a flat sheet conveying surface, with single-sided printing the sheet straightener forms a depression, a depression in the sheet conveying plane, which is not advantageous for the uniformity of sheet conveying.

Der Erfindung liegt die Aufgabe zugrunde, eine in die Bogenförderebene integrierte Bogenglättvorrichtung so auszubilden, daß diese einfach in Reinigungsstellung gebracht werden kann und die Bogen im Schöndruck und im Schön- und Widerdruckbetrieb nicht abschmieren.The invention has for its object a sheet smoothing device integrated into the sheet conveying plane train that this can be easily brought into the cleaning position and do not smear the sheets in straight printing and in perfecting.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Patentanspruches 1 gelöst.According to the invention, this object is achieved by the features of patent claim 1.

Die Integration der Oberfläche des Bogenstraffers in die Bogenförderebene ermöglicht einen weitgehend störungsfreien Bogentransport im einseitigen wie im zweiseitigen Druckbetrieb. Bei Widerdruckbetrieb kann durch die Einspülung eines Luftpolsters eine abschmierfreie Bogenführung gewährleistet werden, ohne daß peripher gelagerte Abdeckelemente zunächst in die Förderebene hineingeschwenkt werden müßten. Ferner garantiert die an vier Hattepunkten erfolgte Lagerung des Bogenstraffers mit Schnappverschlüssen einen problemloses Abschwenken oder Ausbauen des Bogenstraffers mit wenigen Handgriffen.The integration of the surface of the sheet tensioner in the sheet conveying plane enables largely trouble-free sheet transport in one-sided and two-sided printing. In reverse pressure operation, the flushing in of an air cushion ensures that the sheet is guided without lubrication, without peripherally mounted cover elements first having to be pivoted into the conveying plane. In addition, the storage of the sheet tensioner with snap locks at four points guarantees problem-free pivoting or removal of the sheet tensioner in just a few steps.

In vorteilhafter Weise erfolgt die Einspülung der Luft zum Aufbau eines Luftpolsters von einer der angrenzenden Leitbleche der Bogenförderebene aus. Die angrenzenden Leitbleche der Bogenförderebene sind mit Druckluft von niedrigem Druckniveau beaufschlagt.In order to build up an air cushion, the air is advantageously flushed in from one of the adjacent guide plates of the sheet conveying plane. The adjacent baffles on the sheet conveying level are pressurized with compressed air at a low pressure level.

Der erfindungsgemäße Bogenstraffer umfaßt gewölbt ausgeführte Verformungsbereiche, die einander gegenüberliegend ausgeführt sind. Die Verformungsbereiche können mit einzelnen Luftdüsen versehen sein, die sich reihenförmig über die Breite des Bogenauslegers erstrecken. Einer der Verformungsbereiche des Bogenstraffers ist mit Saugluft beaufschlagt, während der gegenüberliegende zweite Verformungsbereich mit Druckluft beaufschlagbar ist. Das Druckniveau für Saug- bzw. Blasluft für die beiden erwähnten Verformungsbereiche am Bogenstraffer liegt dabei etwas höher als das Druckniveau in der Bogenförderebene.The bow tensioner according to the invention comprises domed deformation regions which are designed opposite one another. The deformation areas can be provided with individual air nozzles, which extend in rows across the width of the sheet boom. One of the deformation areas of the sheet tensioner is acted upon by suction air, while the opposite second deformation area can be acted upon by compressed air. The pressure level for suction or blown air for the two deformation areas mentioned on the sheet tensioner is somewhat higher than the pressure level in the sheet conveying plane.

In vorteilhafter Ausgestaltung des der Erfindung zugrundeliegenden Gedankens sind die Luftdüsen, die in Reihe nebeneinander liegend ausgeführt sind, im unteren Bereich des ersten Verformungsbereiches des Bogenstraffers vorgesehen, während die Reihe von Luftdüsen im zweiten Verformungsbereich etwas höher in diesem liegend ausgeführt ist. Bei Beaufschlagung der Verformungsbereiche mit Saug- bzw. Blasluft läßt sich dadurch eine gegenläufige Luftströmung aufbauen, so daß diese im Abschmierbereich sowohl im reinen Schöndruck als auch im Schön- und Widerdruckbetrieb einen Kontakt der bereits bedruckten Bogenseite mit den Oberflächen des Bogenstraffers verhindert.In an advantageous embodiment of the idea on which the invention is based, the air nozzles, which are arranged in a row next to one another, are provided in the lower region of the first deformation region of the sheet tensioner, while the row of air nozzles in the second deformation region is designed to be somewhat higher in this region. When the deformation areas are acted upon by suction or blown air, an opposing air flow can be built up, so that this prevents a contact of the already printed sheet side with the surfaces of the sheet tensioner in the lubrication area, both in straight printing and in perfecting operation.

Zur leichteren Auswechselbarkeit ist der Bogenstraffer mit Schnappverschlüssen ausgerüstet, mit denen er mit wenigen Handgriffen in den Seitenwänden arretierbar bzw. aus diesen entnehmbar ist.To make it easier to replace, the bow tensioner is equipped with snap locks, with which it can be locked in or removed from the side walls in a few simple steps.

Zur Erzeugung der gegenläufigen Luftströmung im Abschmierbereich des Bogenstraffers wird der in Bogenlaufrichtung gesehen erste Verformungsbereich des Bogenstraffers mit Saugluft beaufschlagt, während der in Bogenlaufrichtung gesehen zweite Verformungsbereich des Bogenstraffers mit Blasluft beaufschlagt wird.In order to generate the opposing air flow in the lubrication area of the sheet tensioner, the first deformation area of the sheet tensioner seen in the sheet travel direction is acted upon by suction air, while the second deformation area of the sheet tensioner viewed in the sheet travel direction is subjected to blowing air.

Anhand einer Zeichnung sei die Erfindung nachstehend detaillierter erläutert.The invention will be explained in more detail below with reference to a drawing.

Es zeigen:

Fig. 1
eine Seitenansicht des Bogenstraffers, integriert in die Bogenförderebene,
Fig. 2
eine Draufsicht auf die Verformungsbereiche des Bogenstraffers zwischen den die Bogenförderebene bildenden Leitblechen,
Fig. 3
eine Luftströmungsverteilung im Bogenstraffer mit Ausbildung einer gegenläufigen Luftströmung im Abschmierbereich und
Fig. 4
die schematisch skizzierte Verformung eines den Bogenstraffer passierenden Bogens.
Show it:
Fig. 1
a side view of the sheet tensioner, integrated into the sheet conveying plane,
Fig. 2
2 shows a plan view of the deformation areas of the sheet tensioner between the guide plates forming the sheet conveying plane,
Fig. 3
an air flow distribution in the sheet tensioner with formation of an opposing air flow in the lubrication area and
Fig. 4
the schematically sketched deformation of a bow passing the bow tensioner.

Die Darstellung gemäß Fig. 1 zeigt einen Bogenstraffer 6, der in der Bogenförderebene, den Leitblechen 1 und 2 aufgenommen ist. Die Teile der Bogenförderebene 1 bzw. 2 sind mit einer Vielzahl Luftstrahlen in verschiedene Richtungen leitende Luftdüsen 3 versehen und aus einzelnen Profilen 14 gebildet, die Hohlräume 4 bzw. 5 begrenzen. Zwischen einer Kante 15 der Bogenförderebene 1 und der gegenüberliegenden Kante der Bogenförderebene 2 ist ein Bogenstraffer 6 gelagert. Dieser ist mittels mit 7 und 8 bezeichneten Rastbolzen oder Halterungen in hier nicht dargestellten Seitenwänden des Bogenauslegers der Druckmaschine gelagert.1 shows a sheet tensioner 6, which is received in the sheet conveying plane, the guide plates 1 and 2. The parts of the sheet conveying plane 1 or 2 are provided with a large number of air jets 3 which guide air jets in different directions and are formed from individual profiles 14 which delimit cavities 4 and 5, respectively. A sheet tensioner 6 is mounted between an edge 15 of the sheet conveying plane 1 and the opposite edge of the sheet conveying plane 2. This is mounted by means of 7 and 8 designated locking pins or brackets in side walls, not shown here, of the sheet delivery of the printing press.

Der Bogenstraffer 6 umfaßt einen in Bogenlaufrichtung 18 gesehen ersten Verformungsbereich 11 sowie einen zweiten Verformungsbereich 12, die beide eine gewölbte Oberfläche aufweisen. Der Bogenstraffer 6 wird von zwei Begrenzungswänden 10 seitlich begrenzt. Mit Bezugszeichen 9 ist ein Anschluß für die Luftversorgung des Bogenstraffers bezeichnet. Zwischen den nach unten auslaufenden Oberflächen der Verformungsbereiche 11 und 12 ist ein Spalt verblieben, durch den die Verformungsbereiche 11 und 12 voneinander getrennt sind.The sheet tensioner 6 comprises a first deformation area 11, as seen in the sheet running direction 18, and a second deformation area 12, both of which have a curved surface. The bow tensioner 6 is laterally delimited by two boundary walls 10. Reference number 9 denotes a connection for the air supply to the sheet tensioner. A gap has remained between the downwardly tapering surfaces of the deformation regions 11 and 12, through which the deformation regions 11 and 12 are separated from one another.

In Fig. 2 ist eine Draufsicht auf den zwischen den Leitblechen 1 und 2 aufgenommenen Bogenstraffer 6 gezeigt.2 shows a top view of the sheet tensioner 6 received between the guide plates 1 and 2.

Die ebenfalls mit hier lediglich schematisch dargestellten Lagerungen in den Seitenwänden 17 arretierten Leitbleche 1 und 2 sind mit einer Vielzahl von Luftdüsen 3 versehen. Im in Bogenlaufrichtung 18 gesehen ersten Leitblech 1 sind die einzelnen Düsen symmetrisch zur Förderebenenmitte 21 angeordnet. Mit Bezugszeichen 3 ist eine Düsengruppe bezeichnet, aus der Luftstrahlen in seitlicher Richtung orientiert austreten. Die Luftdüsen können senkrecht zur Förderebenenmitte 21 oder in 15°, 30°, 45°-Orientierung oder beliebigen Blaswinkel-Orientierungsschritten graduell verdreht zueinander angeordnet sein. Mit 20 ist eine Gruppe von Luftdüsen bezeichnet, die streng seitlich orientierte Luftstrahlen erzeugt. An der vorderen Kante des Leitbleches 1 ist eine dem ersten Verformungsbereich 11 des Bogenstraffers 6 gegenüberliegende erste Düsenreihe 16 ausgebildet. Aus dieser kann bei reinem Schöndruck und bei Schön- und Widerdruckbetrieb - wenn also der Kontakt der bereits bedruckten Unterseite mit den stationären Oberflächen des Bogenstraffers 6 vermieden werden soll - die Luftströmung austreten, die das Luftpolster über den Verformungsbereichen 11 und 12 des Bogenstraffers 6 einspült. Da es durch Eckenumschlagen bei Schöndruck auch zum Abschmieren kommen kann, ist das Einspülen eines Luftpolsters auch in dieser Betriebsart von Nutzen.The baffles 1 and 2, which are also locked here only schematically with bearings in the side walls 17, are provided with a large number of air nozzles 3. In the first guide plate 1 seen in the sheet running direction 18, the individual nozzles are arranged symmetrically to the center of the conveying plane 21. Reference number 3 denotes a nozzle group from which air jets emerge oriented in the lateral direction. The air nozzles can be arranged perpendicular to the center of the conveying plane 21 or in a 15 °, 30 °, 45 ° orientation or any blowing angle orientation steps, gradually rotated relative to one another. With 20 a group of air nozzles is designated, which generates strictly laterally oriented air jets. A first row of nozzles 16 opposite the first deformation area 11 of the sheet tensioner 6 is formed on the front edge of the guide plate 1. The air flow, which flushes in the air cushion over the deformation areas 11 and 12 of the sheet tensioner 6, can emerge from the latter in the case of pure face printing and in the perfecting mode, ie if the contact of the already printed underside with the stationary surfaces of the sheet tensioner 6 is to be avoided. Since cornering can also result in greasing when the printing is face-up, flushing in an air cushion is also useful in this operating mode.

Das Luftpolster, welches durch die erste Düsenreihe 16 erzeugt wird, reicht bis an das Leitblech 2 heran, auf dem durch die seitlich blasenden Düsen 19, die dort mit Blasluft eines niedrigeren Druckniveaus beaufschlagt sind, ein seitlich straffender Effekt auf die zu fördernden Bogen 13 ausgeübt wird. An dem zwischen den Kanten der Bogenleitbleche 1 und 2 aufgenommenen Bogenstraffer 6 sind die Verformungsbereiche 11 und 12 von oben gesehen dargestellt. Diese sind mit jeweils zwei Halterungen 7 bzw. 8 in den Seitenwänden 17 des Bogenauslegers der Druckmaschine gelagert. Die Halterungen können mit Federrastbolzen versehen sein, wobei durch einfaches Ziehen der Bolzen nach innen eine Freigabe des Bogenstraffers 6 erfolgt. Andererseits könnte der Bogenstraffer 6 auch durch die Halterungen 7 bzw. 8 in seiner Lage gehalten werden und durch Drücken von der Bedienseite auf das gegenüberliegende Paar der Halterungen 7 und 8 an der Bedienseite freigegeben und dann anschließend einfach ausgehangen werden; auch ein Abschwenken des Bogenstraffers 6 nach Ziehen von lediglich zwei Halterungen 7 bzw. 8 ist möglich.The air cushion, which is generated by the first row of nozzles 16, reaches up to the guide plate 2, on which the laterally blowing nozzles 19, which are subjected to blowing air of a lower pressure level, exert a laterally tightening effect on the sheets 13 to be conveyed becomes. On the sheet tensioner 6 received between the edges of the sheet guide plates 1 and 2, the deformation areas 11 and 12 are shown viewed from above. These are each with two brackets 7 and 8 in the side walls 17 of the sheet delivery of the printing press stored. The brackets can be provided with spring locking bolts, with the tensioner 6 being released by simply pulling the bolts inwards. On the other hand, the sheet tensioner 6 could also be held in position by the brackets 7 and 8 and released by pressing from the operating side onto the opposite pair of brackets 7 and 8 on the operating side and then simply unhooked thereafter; it is also possible to pivot the sheet tensioner 6 after pulling only two brackets 7 and 8.

In der Darstellung gemäß Fig. 3 sind die Strömungsverhältnisse im Bogenstraffer 6 und in den angrenzenden Bogenleitblechen 1 und 2 gezeigt.3, the flow conditions in the sheet tensioner 6 and in the adjacent sheet guide plates 1 and 2 are shown.

Die beiden Bogenleitbleche 1 und 2 sind mit einer Vielzahl in unterschiedliche Richtungen orientierte Luftdüsen 3 versehen. Beide Leitbleche 1 und 2 sind mit je einem Gebläse 26 bzw. 29 versehen, wodurch in die Hohlräume unterhalb dieser Leitbleche Niederdruckluft eines Druckniveaus beispielsweise zwischen 5 und 20 mbar eingebracht wird. Demgegenüber sind die Verformungsbereiche 11, 12 des Bogenstraffers 6 mit Blas- bzw. Saugluft eines höheren Druckniveaus beaufschlagt. Der in Bogenlaufrichtung 18 gesehen liegende erste Verformungsbereich 11 wird mit Saugluft mit einem Unterdruck von beispielsweise etwa 80 mbar beaufschlagt und ist in seinem unteren Bereich mit einer Saugdüsenreihe 23 versehen. Der dem ersten Verformungsbereich 11 gegenüberliegende zweite Verformungsbereich 12 ist mit einer Blasdüsenreihe 22 versehen und mit Blasluft eines Druckniveaus zwischen 100 und 250 mbar beaufschlagt. Der erste Verformungsbereich 11 ist demzufolge mit einer Unterdruckquelle 28, der zweite Verformungsbereich 12 mit einem Gebläse verbunden.The two sheet guide plates 1 and 2 are provided with a large number of air nozzles 3 oriented in different directions. Both baffles 1 and 2 are each provided with a blower 26 or 29, whereby low-pressure air of a pressure level, for example between 5 and 20 mbar, is introduced into the cavities below these baffles. In contrast, the deformation areas 11, 12 of the sheet tensioner 6 are acted upon by blowing or suction air of a higher pressure level. The first deformation area 11, seen in the direction of sheet travel 18, is subjected to suction air with a negative pressure of, for example, approximately 80 mbar and is provided with a row of suction nozzles 23 in its lower area. The second deformation region 12 opposite the first deformation region 11 is provided with a row of blowing nozzles 22 and is supplied with blowing air at a pressure level between 100 and 250 mbar. The first deformation region 11 is consequently connected to a vacuum source 28, the second deformation region 12 to a blower.

Durch Einspülen eines Luftpolsters von der in Fig. 2 gezeigten unteren ersten Düsenreihe 16 des Leitbleches 2 aus, wird dieser Zwickel zwischen den beiden Verformungsbereichen 11 und 12 überbrückt, so daß bei Schön- und Widerdruckbetrieb die bereits bedruckte Unterseite des Bogens 13 nicht mit den Oberflächen des Bogenstraffers 6 in Berührung kommt. Bei reinem Schöndruck, also lediglich einseitigem Bedrucken des Bogens 13 kann durch die Bogenleitbleche 1 und 2 ein den Bogen 13 tragendes Luftpolster erzeugt werden, bevor dieser den Bogenstraffer 6 passiert. Dort wird der Bogen dann durch die Einwirkung von Blasluft 25 auf seine Oberseite oberhalb des Spaltes 24 geglättet, wobei eine Berührung des Bogens 13 mit den Oberflächen der Verformungsbereiche 11 und 12 weniger kritisch ist, aber es dort zu Eckenumschlagen des Bogens 13 und damit zum Abschmieren kommen kann.By flushing in an air cushion from the lower first nozzle row 16 of the guide plate 2 shown in FIG. 2, this gusset is bridged between the two deformation areas 11 and 12, so that the already printed underside of the sheet 13 does not come into contact with the surfaces of the sheet tensioner 6 during perfecting and printing. With pure straight printing, that is to say only one-sided printing of the sheet 13, an air cushion carrying the sheet 13 can be produced by the sheet guide plates 1 and 2 before it passes the sheet tensioner 6. There, the sheet is then smoothed by the action of blown air 25 on its upper side above the gap 24, contact of the sheet 13 with the surfaces of the deformation regions 11 and 12 being less critical, but turning the sheet 13 there and thus lubricating it can come.

Im Gegensatz dazu muß bei Widerdruckbetrieb eine Berührung der frisch bedruckten Unterseite des Bogens 13 mit den Oberflächen der Verformungsbereiche 11 und 12 bei der Passage des Bogenstraffers 6 ausgeschlossen werden, ohne dessen Wirksamkeit einzuschränken. Dazu wird durch die erste Düsenreihe 16 des Leitbleches 1 ein Luftpolster unter dem zu fördernden Bogen 13 erzeugt, welches sich über beide Verformungsbereiche 11 und 12 erstreckt. Zusätzlich wird durch die Blasluftbeaufschlagung der Düsenreihe 22 des zweiten Verformungsbereiches 12 und die Saugluftbeaufschlagung der Saugdüsenreihe 23 im ersten Verformungsbereich 11 eine gegenläufige Luftströmung im Spalt 24 erreicht, die das Eintauchen des Bogens 13 im Widerdruckbetrieb in den Spalt 24 und damit dessen Berührung verhindert. Damit tritt auch keine Berührung der bedruckten Unterseite des sich bewegenden Bogens 13 mit einer stationären Oberfläche des Bogenstraffers 6 auf, die Gefahr des Abschmierens der Unterseite des bedruckten Bogens 13 ist gebannt.In contrast, a contact of the freshly printed underside of the sheet 13 with the surfaces of the deformation areas 11 and 12 must be excluded during the passage of the sheet tensioner 6 without limiting its effectiveness. For this purpose, an air cushion is generated under the sheet 13 to be conveyed by the first row of nozzles 16 of the guide plate 1 and extends over both deformation areas 11 and 12. In addition, due to the blowing air acting on the nozzle row 22 of the second deformation area 12 and the suction air acting on the suction nozzle row 23 in the first deformation area 11, an opposing air flow is achieved in the gap 24, which prevents the arc 13 from immersing in the gap 24 and thus its contact. This also means that there is no contact between the printed underside of the moving sheet 13 and a stationary surface of the sheet tensioner 6, and the risk of the underside of the printed sheet 13 being smeared is averted.

Die Beaufschlagung der Düsenreihe 22 bzw. 23 im reinen Schöndruckbetrieb mit Blas- bzw. Saugluft ist nicht zwingend erforderlich, kann aber, falls gewünscht, vorgenommen werden, um bei kritischen Grammaturen, ein Abschmieren - sollte es zu Eckenumschlagen kommen - zu vermeiden.It is not absolutely necessary to pressurize the row of nozzles 22 or 23 with pure or vacuum air in straight-face printing mode, but can, if desired, be carried out in order to avoid greasing in the case of critical grammages - should the corner turn over.

In Fig. 4 ist in schematischer Weise der Vorgang des Bogenstraffens bei Passage des Bogenstraffers gezeigt.In Fig. 4, the process of bow tightening when passing the bow tightener is shown schematically.

Im hier gezeigten Stadium wird ein Luftpolster 31 unter den geraden Bereich des Bogens 13 über den Leitblechen 1 und 2 erzeugt. Das Straffen des Bogens 13 erfolgt durch Verformung des Bogens 13 durch Blasluft 25 von oben, wenn dieser sich oberhalb des Zwickels des Spaltes 24 befindet. Der Bogen 13 schmiegt sich an die Kontur des ersten und zweiten Verformungsbereiches 11, 12 des Bogenstraffers 6 an. Dabei wird durch Beaufschlagung der Düsenreihen 22 und 23 mit Blas- bzw. Saugluft das Eintauchen des Bogens 13 durch Erzeugung einer gegenläufigen Luftströmung in den Spalt 24 verhindert.In the stage shown here, an air cushion 31 is created under the straight area of the curve 13 above the guide plates 1 and 2. The arch 13 is tightened by deforming the arch 13 by blowing air 25 from above when it is above the gusset of the gap 24. The arch 13 conforms to the contour of the first and second deformation areas 11, 12 of the arch tensioner 6. The action of blowing and suction air on the rows of nozzles 22 and 23 prevents the arc 13 from being immersed by generating an opposing air flow into the gap 24.

BezugszeichenlisteReference list

11
LeitblechBaffle
22nd
LeitblechBaffle
33rd
DüsenNozzles
44th
Hohlraumcavity
55
Hohlraumcavity
66
BogenstrafferBow tensioner
77
Halterungbracket
88th
Halterungbracket
99
LuftversorgungAir supply
1010th
Seitliche BegrenzungswandLateral boundary wall
1111
erster Verformungsbereichfirst deformation area
1212th
zweiter Verformungsbereichsecond deformation area
1313
Bogenbow
1414
Profilprofile
1515
KanteEdge
1616
erste Düsenreihefirst row of nozzles
1717th
SeitenwandSide wall
1818th
BogenlaufrichtungDirection of sheet travel
1919th
seitlich blasende Düsenside blowing nozzles
2020th
bogenspannende Luftdüsenarcing air nozzles
2121
FörderebenemitteFunding level center
2222
BlasdüsenreiheBlow nozzle row
2323
SaudüsenreiheLine of nozzles
2424th
Spaltgap
2525th
Blasluft von obenBlown air from above
2626
Gebläsefan
2727
Gebläsefan
2828
UnterdruckquelleVacuum source
2929
Gebläsefan
3030th
gegenläufiger Luftstromopposite air flow
3131
LuftpolsterAir cushion

Claims (13)

Vorrichtung zur Einwirkung auf Bogen in einem Bogenausleger einer Druckmaschine, in der Bogen wahlweise einseitig oder zweiseitig bedruckt werden können,
dadurch gekennzeichnet,
daß ein mit seiner Oberfläche in die angrenzende Bogenförderebene (1, 2) integrierter Bogenstraffer (6) mit Halterungen (7, 8) bei Schöndruck und Schön- und Widerdruckbetrieb von angrenzenden Luftdüsen (16) mit einem Luftpolster (31) überspült wird.Device for acting on sheets in a sheet delivery of a printing press, in which sheets can be printed on one side or on both sides,
characterized by
that an integrated with its surface in the adjacent sheet conveying plane (1, 2) sheet tensioner (6) with brackets (7, 8) in straight printing and perfecting operation of adjacent air nozzles (16) is flushed with an air cushion (31). Vorrichtung zur Einwirkung auf Bogen nach Anspruch 1,
dadurch gekennzeichnet,
daß die angrenzenden Bogenförderebenen (1, 2) mit Luftdüsen (3, 16, 19, 20) versehen sind.Device for acting on sheets according to claim 1,
characterized by
that the adjacent sheet conveying planes (1, 2) are provided with air nozzles (3, 16, 19, 20). Vorrichtung zur Einwirkung auf Bogen nach Anspruch 2,
dadurch gekennzeichnet,
daß die angrenzenden Bogenförderebenen (1, 2) mit Niederdruckluft beaufschlagbar sind.Device for acting on sheets according to claim 2,
characterized by
that the adjacent sheet conveying planes (1, 2) can be acted upon by low-pressure air. Vorrichtung zur Einwirkung auf Bogen nach Anspruch 1,
dadurch gekennzeichnet,
daß der Bogenstraffer (6) Verformungsbereiche (11, 12) umfaßt.Device for acting on sheets according to claim 1,
characterized by
that the sheet tensioner (6) comprises deformation areas (11, 12). Vorrichtung zur Einwirkung auf Bogen nach Anspruch 4,
dadurch gekennzeichnet,
daß die Verformungsbereiche (11, 12) einander gegenüber liegen.Device for acting on sheets according to claim 4,
characterized by
that the deformation areas (11, 12) face each other. Vorrichtung zur Einwirkung auf Bogen nach Anspruch 4,
dadurch gekennzeichnet,
daß die Verformungsbereiche (11, 12) mit Luftdüsen (22, 23) ausgestattet sind.Device for acting on sheets according to claim 4,
characterized by
that the deformation areas (11, 12) are equipped with air nozzles (22, 23). Vorrichtung zur Einwirkung auf Bogen nach Anspruch 4,
dadurch gekennzeichnet,
daß ein erster Verformungsbereich (11) des Bogenstraffers (6) mit Saugluft und der zweite Verformungsbereich (12) des Bogenstraffers (6) mit Druckluft beaufschlagt ist.Device for acting on sheets according to claim 4,
characterized by
that a first deformation area (11) of the sheet tensioner (6) is acted upon by suction air and the second deformation area (12) of the sheet tensioner (6) is pressurized with compressed air. Vorrichtung zur Einwirkung auf Bogen nach Anspruch 3 und Anspruch 7,
dadurch gekennzeichnet,
daß das Druckniveau in den Bogenförderebenen (1, 2) niedriger liegt als die Druckniveaus für Blasluft im ersten Verformungsbereich (11) bzw. für Saugluft im zweiten Verformungsbereich (12).Device for acting on sheets according to claim 3 and claim 7,
characterized by
that the pressure level in the sheet conveying planes (1, 2) is lower than the pressure levels for blowing air in the first deformation area (11) or for suction air in the second deformation area (12). Vorrichtung zur Einwirkung auf Bogen nach Anspruch 6,
dadurch gekennzeichnet,
daß die Luftdüsen (23) im unteren Bereich des ersten Verformungsbereiches (11) des Bogenstraffers (6) vorgesehen sind.Device for acting on sheets according to claim 6,
characterized by
that the air nozzles (23) are provided in the lower region of the first deformation region (11) of the sheet tensioner (6). Vorrichtung zur Einwirkung auf Bogen nach Anspruch 1,
dadurch gekennzeichnet,
daß die Halterungen federbelastete Schnappverschlüsse (7, 8) sind, mit welchen der Bogenstraffer (6) in Seitenwänden (17) der Druckmaschine arretierbar ist.Device for acting on sheets according to claim 1,
characterized by
that the brackets are spring-loaded snap locks (7, 8) with which the sheet tensioner (6) can be locked in side walls (17) of the printing press. Vorrichtung zur Einwirkung auf Bogen nach Anspruch 1,
dadurch gekennzeichnet,
daß bei Schöndruck und Schön- und Widerdruckbetrieb im Bogenstraffer (6) zwischen den Verformungsbereichen (11, 12) durch die Beaufschlagung der Luftdüsenreihen (22, 23) mit Saug- bzw. Blasluft eine gegenläufige Luftströmung erzeugt wird.Device for acting on sheets according to claim 1,
characterized by
that in reverse printing and perfecting operation in the sheet tensioner (6) between the deformation areas (11, 12) by acting on the air nozzle rows (22, 23) with suction or blown air, an opposing air flow is generated. Vorrichtung zur Einwirkung auf Bogen nach Anspruch 7,
dadurch gekennzeichnet,
daß der in Bogenförderrichtung (18) gesehen erste Verformungsbereich (11) mit Saugluft beaufschlagt und der in Bogenförderrichtung (18) zweite Verformungsbereich (12) mit Blasluft beaufschlagt wird.Device for acting on sheets according to claim 7,
characterized by
that the first deformation area (11) seen in the sheet conveying direction (18) is acted upon by suction air and the second deformation area (12) in the sheet conveying direction (18) is acted upon by blown air. Verwendung einer Vorrichtung zur Einwirkung auf Bogen in einem Bogenausleger einer Druckmaschine, in der Bogen wahlweise einseitig oder zweiseitig bedruckt werden können mit einem mit seiner Oberfläche in die angrenzende Bogenförderebene (1, 2) integrierten Bogenstraffer (6) mit Halterungen (7, 8), der bei Schöndruck und Schön- und Widerdruckbetrieb von angrenzenden Luftdüsen (16) mit einem Luftpolster überspült wird.Use of a device for acting on sheets in a sheet delivery of a printing press, in which sheets can be printed either on one or two sides with a sheet tensioner (6) with holders (7, 8) integrated with its surface in the adjacent sheet conveying plane (1, 2), which is flushed with an air cushion by adjacent air nozzles (16) during straight printing and perfecting operation.
EP96117816A 1995-12-20 1996-11-07 Device for acting on sheets in a sheet delivery apparatus Expired - Lifetime EP0780332B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19547546A DE19547546A1 (en) 1995-12-20 1995-12-20 Device for acting on sheets in a sheet delivery
DE19547546 1995-12-20

Publications (3)

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EP0780332A2 true EP0780332A2 (en) 1997-06-25
EP0780332A3 EP0780332A3 (en) 1998-03-25
EP0780332B1 EP0780332B1 (en) 1999-09-15

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ID=7780636

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Country Status (5)

Country Link
US (1) US5832826A (en)
EP (1) EP0780332B1 (en)
JP (1) JPH09174816A (en)
AT (1) ATE184570T1 (en)
DE (2) DE19547546A1 (en)

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Also Published As

Publication number Publication date
US5832826A (en) 1998-11-10
ATE184570T1 (en) 1999-10-15
JPH09174816A (en) 1997-07-08
DE19547546A1 (en) 1997-07-03
EP0780332A3 (en) 1998-03-25
EP0780332B1 (en) 1999-09-15
DE59603062D1 (en) 1999-10-21

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