EP0792742B2 - Sheet transport device and method for guiding sheetlike material in a printing machine, specially in an offset rotary printing machine for sheets - Google Patents
Sheet transport device and method for guiding sheetlike material in a printing machine, specially in an offset rotary printing machine for sheets Download PDFInfo
- Publication number
- EP0792742B2 EP0792742B2 EP96118243A EP96118243A EP0792742B2 EP 0792742 B2 EP0792742 B2 EP 0792742B2 EP 96118243 A EP96118243 A EP 96118243A EP 96118243 A EP96118243 A EP 96118243A EP 0792742 B2 EP0792742 B2 EP 0792742B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzles
- zone
- guide surface
- zones
- blowing
- 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
Links
- 238000007639 printing Methods 0.000 title claims description 36
- 238000000034 method Methods 0.000 title claims description 4
- 238000007664 blowing Methods 0.000 claims description 39
- 238000007645 offset printing Methods 0.000 claims description 4
- 230000032258 transport Effects 0.000 description 11
- 238000005339 levitation Methods 0.000 description 5
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F21/00—Devices for conveying sheets through printing apparatus or machines
-
- 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
- B65H29/24—Delivering or advancing articles from machines; Advancing articles to or into piles by air blast or suction apparatus
- B65H29/245—Air blast devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/22—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device
- B65H5/228—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by air-blast devices
-
- 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
-
- 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
- B65H2406/113—Details of the part distributing the air cushion
- B65H2406/1132—Multiple nozzles arrangement
-
- 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 sheet transport device and a method of guiding arcuate Material in a printing press, in particular a sheet-fed rotary offset printing machine, according to the preamble of claims 1, 2 and 11.
- DE-OS 44 06 844 is a device for hovering sheets in a rotary printing machine known in the case of a guide surface in three in the direction of the sheet guide, arranged across the width of the sheet guide surface Zones are let in, both in the beautiful as well as in the beautiful and reverse printing of Blowing air must always be applied to the press and a reliable levitation of the bow in to ensure the two operating modes.
- nozzles have a blowing direction that essentially to the side and to the rear edge of the sheet is directed so that both a lateral tightening of the Bow, as well as a tightening of the bow in the longitudinal direction of the bow in these lateral guide zones.
- the scripture gives no indication of the blowing direction of the nozzles in the middle zone in the sheet transport direction and in the middle zone arranged nozzles in the perfecting mode to be blown with air and this in straight printing off.
- WO / A / 92/05467 describes a transport device for photographic films, which one Transport surface with rows of nozzles running in the longitudinal direction which has a total of three each Longitudinally assigned nozzle rows assigned Blow boxes are charged with blown air.
- the blowing direction of the in the middle of the film material Zone arranged blowing nozzles points in Film transport direction, whereas that on the side edges arranged on the transport surface Have blowing direction that the sheet transport direction is opposite.
- the object of the invention is to be achieved to create an apparatus and method with those during the perfecting operation a reliable levitation of the bilateral printed sheet is guaranteed and with which in straight printing at high printing speeds extremely short set-up times, as well also a reliable and effective tightening of the bow let achieve. It is also a task of Invention, the energy requirement and the device effort for sheet guiding in straight printing reduce.
- the invention has the particular advantage on that with her switching the sheet guide between straight printing and face and reverse printing the printing press without complex adjustment work is possible. Furthermore, the invention Device the advantage that they are particularly without problems in the area of dry sections, in which there is high heat development and in which the use of switchable in their direction of rotation Axial fans or axial fans are not possible is, can be used.
- the device 1 shown in Fig. 1 for Guiding sheet material 2 in a printing press has a guide surface 4, over the the bow 2 into the one marked by the arrow A. Sheet guiding direction is moved away.
- the leadership area 4 points in the preferred embodiment of the invention as shown in FIG. 1 and FIG. 2 as a whole three are in the longitudinal direction of the guide surface 4 extending zones 6, 8, 10, of which the zone 6 in the middle of the guide surface 4 and zones 8 and 10 corresponding to the side edges of the guide surface 4 are arranged.
- zones 6, 8, 10 are Blown air nozzles 12, 14, 16 arranged, which in the figures are shown only schematically and their blowing directions are indicated by associated arrows.
- the blowing direction in the middle or first zone 6 arranged blowing nozzles 12 points in the preferred Embodiment of the invention essentially in the transport direction A of the sheet 2, however, can also a component in the direction of Have sides of the sheet guide surface 4.
- the blowing direction which in the right or second zone 8 of Fig. 1 and 2 arranged on the right side of the guide surface 4 Blow nozzles 14 essentially have in Direction of the right side edge of the guide surface 4, and the blowing direction in the left or third zone 10 arranged blowing nozzles 16 essentially has to the left edge of the guide surface 4.
- the blowing direction the nozzles 14 and 16 preferably run at an angle of 90 ° to the transport direction A, can, however, also be in a range from 30 to 120 °.
- the nozzles 12, 14, 16 can each have any shape of nozzle and are preferred in the Embodiment of the invention by im State of the art, for example in the an existing guide surface 4 punched into a flat sheet Slot nozzles with preferably diverging Blown air jets formed.
- the blowing direction in relation on the guide surface 4 is at least in the lateral Nozzles 14, 16, as shown in FIGS. 3 and 4, essentially directed tangentially, but can also a component in the direction of the surface normal have the guide surface 4.
- the blowing direction of this lateral nozzles 14 and 16 is shown in Fig. 3 shown.
- the blowing direction in the middle zone 6 nozzles 12 is arranged with respect to the guide surface 4 preferably also essentially tangential directed, but can in the same way as in the nozzles 14 and 16 also have a vertical component to the guide surface 4. Furthermore, it can be provided be that to produce an improved Levitation around the nozzles 12 of the middle zone 6 around, not shown in the figures, by a round opening in the central zone 6 blow nozzles formed are provided, the blowing direction of which is only one Component in the direction of the surface normal of the Has guide surface 4.
- the distribution of the nozzles 14 and 16 over the side edge zones 8 and 10 is at preferred embodiment of the invention chosen such that the blowing jets of the near the middle zone 6 arranged nozzles between run through the outermost nozzles and not directly to the center of the farther outside lying nozzles are directed.
- This allows one uniform essentially vortex free flow of achieve side nozzles 14 and 16, which at Transport of a sheet 2 over the guide surface 4 for a lateral tightening of the arch both in the Schönals also ensures beautiful and reverse printing.
- the Occupancy density at nozzles in zones 6, 8 and 10 can be both homogeneous and uniform in one zone, as well as inhomogeneous, e.g. B. from the center of the guide surface 4 decreasing towards the side edges, his
- Fig. 1 As shown in Fig. 1 are below the zones 6, 8, 10 separate blow boxes 18, 20 assigned to them and 22 arranged, the unspecified Lines with associated fans 24, 26 and 28 in terms of flow are connected and the blow boxes 18, 20 and 22 during the perfecting mode supply blown air to the press.
- these Embodiments of the invention will be any blow box supplied by its own fan 24, 26, 28. The required amount of air is preferred by a correspondingly variable speed of the Blower 24, 26, 28 reached because of the effort for corresponding throttle valves.
- blowers 24, 26 and 28 can also be operated with throttle valves 30, 32 and 34 with the blow boxes 18, 20 and 22 be connected. The amount of air over the Throttle position of valves 30, 32 and 34 set.
- the blowing air generates in perfect and reverse printing mode under sheet 2 a constant air cushion on which the sheet 2 is secure and at a constant distance from the guide surface 4 passed over the guide surface 4 is, in which case the printed sheet underside does not come into contact with the guide surface 4.
- the fan speed accordingly or the valves
- the floating state between the sheet 2 and the guide surface 4 in the Zones 6, 8, 10 are adjusted accordingly, whereby depending on the production speed the printing press in perfecting mode reliable and trouble-free sheet guidance can be achieved.
- blow boxes 120 and 122 in terms of flow connected and are about a common fan 128 and an associated one Flow throttle 132 is charged with blown air. In this Traps are only two fans for the device 124, 128 sufficient.
- blow boxes 18, 118, 20, 120 and 22, 122 by only a, shown in Fig. 2 in dashed lines Blower 200 and corresponding flow restrictors 210 and 212 can be supplied with blown air.
- a Shut-off valve 214 included, with which the blown air supply interrupt to the middle blow box 18, 118 leaves, so that the blown air supply of the middle Blow box 18, 118 is turned off while the side Blow boxes 20, 120 and 22, 122 through the blower 200 continue to be blown with air.
- the shut-off function is also through Combination of valves 210 and 214 in a common Unity possible.
- the Lowering the arch 2 in the central zone 6 is based on the so-called ejector effect, which thereby is caused that the outward air flow the side nozzles 14 and 16 between the arch 2 and the guide surface 4 in the middle Zone 6 entrains air and transports it outside, so that this area is evacuated and a Vacuum occurs when the fan is off 24, 124 or closed shut-off valve 214 none or only a little air flows through the nozzles 12.
- the Sheet 2 is therefore with its underside in the area of Zone 6 sucked on the guide surface 4 and slides on this, which makes a
- the arch 2 is tightened in the longitudinal direction of the arch, which together with that through the outside directed air flow in the lateral zones 8 and 10 lateral tightening of the arch 2 in Fine printing operation of the printing press a trouble-free Guaranteed sheet travel.
- blowing air on or off in the middle zone 6 can thus be easier and more convenient Way between the perfecting and reverse printing the printing press, in which the blowing air is switched on and a clean levitation guide shown in Fig. 3 of the bow, and that shown in FIG. 4 Face printing, in which the unprinted Lower edge of the sheet in the area of the middle zone 6 slides on the guide surface 4, can be switched.
- the blowing air for a safe sheet run set once in perfecting mode the printer can switch between the two operating modes Face printing and perfecting through single and single Switch off the blown air in zone 6 inside switch over in the shortest possible time without further adjustments of air volumes and air routing.
- there is the advantage that for Sucking the sheet in zone 6 in straight printing no suction fan is required and therefore the equipment and the energy requirement of the invention Device 1 in the straight printing mode can be greatly reduced.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Description
Die Erfindung betrifft eine Bogentransport Vorrichtung und ein Verfahren zur Führung von bogenförmiges Material in einer Druckmaschine, insbesondere einer Bogenrotations-Offsetdruckmaschine, gemäß dem Oberbegriff von Anspruch 1, 2 und 11.The invention relates to a sheet transport device and a method of guiding arcuate Material in a printing press, in particular a sheet-fed rotary offset printing machine, according to the preamble of claims 1, 2 and 11.
Beim Transport von bogenförmigem Material durch eine Druckmaschine, insbesondere Bogenrotations-Offsetdruckmaschine, ist es in der Regel erforderlich, die Bogen über bestimmte Strecken flatterfrei und in möglichst gestrafftem Zustand ohne Verwerfungen zu führen. Hierzu werden im allgemeinen Führungsflächen mit darin angeordneten Luftdüsen verwendet, welche die Bogen auf ihrer Unterseite mit Blasluft beaufschlagen, so daß eine Schwebeführung der Bogen über der Führungsfläche erfolgt.When transporting sheet material by a printing machine, in particular sheet-fed offset printing machine, it is usually necessary the sheets flutter-free over certain distances and as tight as possible without warping to lead. For this purpose, guide surfaces are generally used with air nozzles arranged therein, which blow air on the underside, so that the arch is suspended above the Leading surface takes place.
Aus der DE-OS 44 06 844 ist eine Vorrichtung zum schwebenden Führen von Bogen in einer Rotationsdruckmaschine bekannt, bei der auf einer Führungsfläche in drei in Bogenführungsrichtung verlaufenden, quer über die Breite der Bogenführungsfläche angeordneten Zonen Blasdüsen eingelassen sind, die sowohl im Schön- als auch im Schön- und Widerdruck der Druckmaschine stets mit Blasluft beaufschlagt werden und ein zuverlässige Schwebeführung des Bogens in den beiden Betriebsarten sicherstellen sollen. Um gleichzeitig neben der Schwebeführung eine Straffung des Bogens zu erhalten, weisen die im Bereich des Zentrums entlang der Längsachse der Bogenführungsfläche angeordneten Düsen eine Blasrichtung auf, die im wesentlichen entgegen der Bewegung des Bogens zu dessen Hinterkante hin gerichtet ist. Hierdurch soll eine Straffung des Bogens in Bogenlängsrichtung erfolgen. Die in den anderen beiden, seitlichen Zonen angeordneten Düsen besitzen hingegen eine Blasrichtung, die im wesentlichen zur Seite und zur Bogenhinterkante hin gerichtet ist, so daß sowohl eine seitliche Straffung des Bogens, als auch eine Straffung des Bogens in Bogenlängsrichtung in diesen seitlichen Führungszonen erfolgt. Die Schrift gibt keinen Hinweis darauf, die Blasrichtung der Düsen in der mittleren Zone in Bogentransportrichtung vorzusehen und die in der mittleren Zone angeordneten Düsen im Schön- und Widerdruckbetrieb mit Blasluft zu beaufschlagen und diese im Schöndruckbetrieb abzuschalten.DE-OS 44 06 844 is a device for hovering sheets in a rotary printing machine known in the case of a guide surface in three in the direction of the sheet guide, arranged across the width of the sheet guide surface Zones are let in, both in the beautiful as well as in the beautiful and reverse printing of Blowing air must always be applied to the press and a reliable levitation of the bow in to ensure the two operating modes. Around at the same time a tightening in addition to the levitation to get the arch point in the area of the center along the longitudinal axis of the sheet guide surface arranged nozzles on a blowing direction, which in essentially against the movement of the bow the rear edge of which is directed. This is supposed to Tighten the arch in the longitudinal direction of the arch. Those arranged in the other two side zones In contrast, nozzles have a blowing direction that essentially to the side and to the rear edge of the sheet is directed so that both a lateral tightening of the Bow, as well as a tightening of the bow in the longitudinal direction of the bow in these lateral guide zones. The scripture gives no indication of the blowing direction of the nozzles in the middle zone in the sheet transport direction and in the middle zone arranged nozzles in the perfecting mode to be blown with air and this in straight printing off.
Die WO/A/92/05467 beschreibt eine Transportvorrichtung für fotografische Filme, welche eine Transportfläche mit in Längsrichtung verlaufenden Düsenreihen aufweist, die über insgesamt drei den jeweiligen Düsenreihen zugeordnete, in Längsrichtung verlaufende Blaskästen mit Blasluft beaufschlagt werden. Die Blasrichtung der in der Mitte des Filmmaterials verlaufenden Zone angeordneten Blasdüsen weist dabei in Filmtransportrichtung, wohingegen die an den Seitenrändern der Transportfläche angeordneten Düsen eine Blasrichtung aufweisen, die der Bogentransportrichtung entgegengerichtet ist.WO / A / 92/05467 describes a transport device for photographic films, which one Transport surface with rows of nozzles running in the longitudinal direction which has a total of three each Longitudinally assigned nozzle rows assigned Blow boxes are charged with blown air. The blowing direction of the in the middle of the film material Zone arranged blowing nozzles points in Film transport direction, whereas that on the side edges arranged on the transport surface Have blowing direction that the sheet transport direction is opposite.
Durch die Erfindung soll die Aufgabe gelöst werden, eine Vorrichtung und ein Verfahren zu schaffen, mit denen während des Schön- und Widerdruckbetriebes eine zuverlässige Schwebeführung der beidseitig bedruckten Bogen gewährleistet wird und mit welchen sich im Schöndruckbetrieb bei hohen Druckgeschwindigkeiten sowohl äußerst kurze Einrichtungszeiten, als auch eine zuverlässige und effektive Straffung der Bogen erzielen lassen. Weiterhin ist es eine Aufgabe der Erfindung, den Energiebedarf sowie den Vorrichtungsaufwand für die Bogenführung im Schöndruckbetrieb zu verringern.The object of the invention is to be achieved to create an apparatus and method with those during the perfecting operation a reliable levitation of the bilateral printed sheet is guaranteed and with which in straight printing at high printing speeds extremely short set-up times, as well also a reliable and effective tightening of the bow let achieve. It is also a task of Invention, the energy requirement and the device effort for sheet guiding in straight printing reduce.
Diese Aufgabe wird gemäß der Erfindung durch die Merkmale von Anspruch 1, 2 und 11 gelöst.This object is achieved according to the invention solved by the features of claim 1, 2 and 11.
Weitere Merkmale der Erfindung sind in den Unteransprüchen enthalten.Further features of the invention are in the Subclaims included.
Die Erfindung weist insbesondere den Vorteil auf, daß mit ihr ein Umschalten der Bogenführung zwischen dem Schöndruck und dem Schön- und Widerdruckbetrieb der Druckmaschine ohne aufwendige Einstellarbeiten möglich ist. Weiterhin besitzt die erfindungsgemäße Vorrichtung den Vorteil, daß sie sich insbesondere problemlos im Bereich von Trockenstrecken, in denen eine hohe Hitzeentwicklung besteht und in denen der Einsatz von in ihrer Drehrichtung umschaltbaren Axialventilatoren oder Axialgebläsen nicht möglich ist, einsetzen läßt.The invention has the particular advantage on that with her switching the sheet guide between straight printing and face and reverse printing the printing press without complex adjustment work is possible. Furthermore, the invention Device the advantage that they are particularly without problems in the area of dry sections, in which there is high heat development and in which the use of switchable in their direction of rotation Axial fans or axial fans are not possible is, can be used.
Die Erfindung wird nachfolgend mit Bezug auf die Zeichnungen anhand bevorzugter Ausführungsformen beschrieben.The invention is described below with reference to the drawings based on preferred embodiments described.
In den Zeichnungen zeigen:
- Fig. 1
- eine perspektivische, abgebrochene Darstellung einer erfindungsgemäßen Vorrichtung zur Führung von bogenförmigem Material mit drei separat mit Blasluft beaufschlagbaren Zonen,
- Fig. 2
- eine weitere Auslührungsform der erfindungsgemäßen Vorrichtung nach Fig. 1, bei der die seitlichen Zonen miteinander in Strömungsverbindung stehen und die mittlere Zone sowie die beiden äußeren Zonen über Gebläse mit Blasluft beaufschlagbar sind,
- Fig. 3
- einen Schnitt durch die erfindungsgemäße Vorrichtung von Anspruch 1 während des Schön- und Widerdruckbetriebes,
- Fig. 4
- eine schematische Querschnittsansicht der Vorrichtung nach Fig. 1 im Schöndruckbetrieb.
- Fig. 1
- 2 shows a perspective, broken-away representation of a device according to the invention for guiding sheet material with three zones which can be acted upon separately with blown air,
- Fig. 2
- 1, in which the lateral zones are in flow connection with one another and the middle zone and the two outer zones can be blown with blown air,
- Fig. 3
- 2 shows a section through the device according to the invention of claim 1 during the perfecting operation,
- Fig. 4
- is a schematic cross-sectional view of the device of FIG. 1 in straight printing.
Die in Fig. 1 dargestellte Vorrichtung 1 zum
Führen von bogenförmigem Material 2 in einer Druckmaschine,
beispielsweise einer Bogenrotations-Offsetdruckmaschine,
besitzt eine Führungsfläche 4, über die
der Bogen 2 in die durch den Pfeil A gekennzeichnete
Bogenführungsrichtung hinweg bewegt wird. Die Führungsfläche
4 weist bei der bevorzugten Ausführungsform
der Erfindung, wie in Fig. 1 und Fig. 2 gezeigt, insgesamt
drei sich in Längsrichtung der Führungsfläche
4 erstreckende Zonen 6, 8, 10 auf, von denen die Zone
6 in der Mitte der Führungsfläche 4 und die Zonen 8 und
10 entsprechend an den Seitenrändern der Führungsfläche
4 angeordnet sind. In den Zonen 6, 8, 10 sind
Blasluftdüsen 12, 14, 16 angeordnet, welche in den Figuren
nur schematisch dargestellt sind und deren Blasrichtungen
durch zugehörige Pfeile angedeutet sind.
Die Blasrichtung der in der mittleren oder ersten Zone
6 angeordneten Blasdüsen 12 weist bei der bevorzugten
Ausführungsform der Erfindung im wesentlichen in
die Transportrichtung A des Bogens 2, kann jedoch
ebenfalls zusätzlich eine Komponente in Richtung der
Seiten der Bogenführungsfläche 4 aufweisen. Die Blasrichtung
der in der rechten oder zweiten Zone 8 von Fig.
1 und 2 auf der rechten Seite der Führungsfläche 4 angeordneten
Blasdüsen 14 weist im wesentlichen in
Richtung des rechten Seitenrandes der Führungsfläche
4, und die Blasrichtung der in der linken oder dritten Zone
10 angeordneten Blasdüsen 16 weist im wesentlichen
zum linken Rand der Führungsfläche 4. Die Blasrichtung
der Düsen 14 und 16 verläuft dabei vorzugsweise
in einen Winkel von 90° zur Transportrichtung A,
kann jedoch auch in einem Bereich von 30 bis 120° liegen.The device 1 shown in Fig. 1 for
Guiding sheet material 2 in a printing press,
for example a sheet-fed offset printing press,
has a guide surface 4, over the
the bow 2 into the one marked by the arrow A.
Sheet guiding direction is moved away. The leadership area
4 points in the preferred embodiment
of the invention as shown in FIG. 1 and FIG. 2 as a whole
three are in the longitudinal direction of the guide surface
4 extending
Die Düsen 12, 14, 16 können prinzipiell jede
beliebige Düsenform aufweisen und werden bei der bevorzugten
Ausführungsform der Erfindung durch im
Stand der Technik bekannte, beispielsweise in die aus
einem ebenen Blech bestehende Führungsfläche 4 eingestanzte
Schlitzdüsen mit vorzugsweise divergierenden
Blasluftstrahlen gebildet. Die Blasrichtung in Bezug
auf die Führungsfläche 4 ist zumindest bei den seitlichen
Düsen 14, 16, wie in Fig. 3 und Fig. 4 dargestellt,
im wesentlichen tangential gerichtet, kann jedoch auch
eine Komponente in Richtung der Oberflächennormalen
der Führungsfläche 4 besitzen. Die Blasrichtung dieser
seitlichen Düsen 14 und 16 ist beispielsweise in Fig.
3 dargestellt. Die Blasrichtung der in der mittleren Zone
6 angeordneten Düsen 12 ist in Bezugauf die Führungsfläche
4 vorzugsweise ebenfalls im wesentlichen tangential
gerichtet, kann jedoch in gleicher Weise wie bei
den Düsen 14 und 16 auch eine vertikale Komponente
zur Führungsfläche 4 aufweisen. Weiterhin kann es vorgesehen
sein, daß zur Erzeugung eines verbesserten
Schwebezustandes um die Düsen 12 der mittleren Zone
6 herum in den Figuren nicht dargestellte, durch eine
runde Öffnung in der mittleren Zone 6 gebildete Blasdüsen
vorgesehen sind, deren Blasrichtung lediglich eine
Komponente in Richtung der Oberflächennormalen der
Führungsfläche 4 aufweist. Die Verteilung der Düsen 14
und 16 über die seitlichen Randzonen 8 und 10 ist bei
der bevorzugten Ausführungsform der Erfindung vorzugsweise
derart gewählt, daß die Blasstrahlen der nahe
der mittleren Zone 6 angeordneten Düsen zwischen
den weiter außen liegenden Düsen hindurch verlaufen
und nicht unmittelbar auf das Zentrum der weiter außen
liegenden Düsen gerichtet sind. Hierdurch läßt sich eine
gleichförmige im wesentlichen wirbelfreie Strömung der
seitlichen Düsen 14 und 16 erzielen, welche beim
Transport eines Bogens 2 über die Führungsfläche 4 für
eine seitliche Straffung des Bogens sowohl im Schönals
auch im Schön- und Widerdruckbetrieb sorgt. Die
Belegungsdichte an Düsen in den Zonen 6, 8 und 10
kann dabei in einer Zone sowohl homogen und gleichförmig,
als auch inhomogen, z. B. von der Mitte der Führungsfläche
4 zu den Seitenrändern hin abnehmend,
seinIn principle, the
Wie in Fig. 1 gezeigt sind unterhalb der Zonen
6, 8, 10 diesen zugeordnete separate Blaskästen 18, 20
und 22 angeordnet, die über nicht näher bezeichnete
Leitungen mit zugehörigen Gebläsen 24, 26 und 28 strömungsmäßig
verbunden sind und die den Blaskästen
18, 20 und 22 während des Schön- und Widerdruckbetriebes
der Druckmaschine Blasluft zuführen. Bei diesen
Ausführungsformen der Erfindung wird jeder Blaskasten
über ein eigenes Gebläse 24, 26, 28 versorgt.
Die geforderte Luftmenge wird dabei vorzugsweise
durch eine entsprechend veränderliche Drehzahl der
Gebläse 24, 26, 28 erreicht, weil dadurch der Aufwand
für entsprechende Drosselventile entfällt.As shown in Fig. 1 are below the
In einer weiteren Ausführungsform der Erfindung
können die Gebläse 24, 26 und 28 auch über Drosselventile
30, 32 und 34 mit den Blaskästen 18, 20 und
22 verbunden sein. Dabei wird die Luftmenge über die
Drosselstellung der Ventile 30, 32 und 34 eingestellt.In a further embodiment of the invention
the
Wie in Fig. 3 dargestellt, erzeugt die Blasluft
im Schön- und Widerdruckbetrieb unter dem Bogen 2
ein konstantes Luftpolster, auf welchem der Bogen 2 sicher
und in einem konstanten Abstand von der Führungsfläche
4 über die Führungsfläche 4 hinweggeführt
wird, wobei die in diesem Falle bedruckte Bogenunterseite
nicht mit der Führungsfläche 4 in Kontakt tritt.
Durch entsprechendes Verstellen der Gebläsedrehzahl
bzw. der Ventile, kann dabei der Schwebezustand zwischen
dem Bogen 2 und der Führungsfläche 4 in den
Zonen 6, 8, 10 entsprechend eingeregelt werden, wodurch
sich in Abhängigkeit von der Fortdruckgeschwindigkeit
der Druckmaschine im Schön- und Widerdruckbetrieb
eine zuverlässige und störungsfreie Bogenführung
erzielen läßt.As shown in Fig. 3, the blowing air generates
in perfect and reverse printing mode under sheet 2
a constant air cushion on which the sheet 2 is secure
and at a constant distance from the guide surface
4 passed over the guide surface 4
is, in which case the printed sheet underside
does not come into contact with the guide surface 4.
By adjusting the fan speed accordingly
or the valves, the floating state between
the sheet 2 and the guide surface 4 in the
Bei einer weiteren Ausführungsform der Erfindung,
welche beispielsweise in Fig. 2 dargestellt ist, sind
die äußeren seitlichen Blaskästen 120 und 122 strömungsmäßig
miteinander verbunden und werden über
ein gemeinsames Gebläse 128 und eine zugehörige
Strömungsdrossel 132 mit Blasluft beaufschlagt. In diesem
Falle sind für die Vorrichtung lediglich zwei Gebläse
124, 128 ausreichend. Weiterhin können bei den in Fig.
1 und2 dargestellten Ausführungsformen der Erfindung
die Blaskästen 18, 118, 20, 120 und 22, 122 durch lediglich
ein, in Fig. 2 in gestrichelten Linien dargestelltes
Gebläse 200 sowie entsprechende Strömungsdrosseln
210 und 212 mit Blasluft versorgt werden. Bei dieser
Ausführungsform der Erfindung ist in der Blasluftleitung
zur Versorgung des mittleren Blaskastens 18, 118 ein
Absperrventil 214 enthalten, mit welchem sich die Blasluftzufuhr
zum mittleren Blaskasten 18, 118 unterbrechen
läßt, so daß die Blasluftversorgung des mittleren
Blaskastens 18, 118 abgeschaltet ist, während die seitlichen
Blaskästen 20, 120 und 22, 122 durch das Gebläse
200 weiterhin mit Blasluft beaufschlagt werden.
Selbstverständlich ist die Absperrfunktion auch durch
Kombination der Ventile 210 und 214 in einer gemeinsamen
Einheit möglich.In a further embodiment of the invention,
which are shown for example in Fig. 2
the outer
Durch Abschalten der Blasluft für die Blasdüsen
12 des mittleren Blaskastens 18, 118 der mittleren
Zone 6 der Führungsfläche 4, welches entweder durch
Ausschalten des Gebläses 24 bzw. 124 oder aber bei
den lediglich ein Gebläse 200 aufweisenden Ausführungsformen
der Erfindung durch Sperren des Absperrventils
214 erfolgen kann, wird wie in Fig. 4 dargestellt,
der Bogen 2 im Bereich der mittleren Zone 6 gegenüber
der Führungsfläche 4 abgesenkt und berührt mit seiner
Unterkante die Oberseite der Führungsfläche 4. Das
Absenken des Bogens 2 in der mittleren Zone 6 beruht
auf der sogenannte Ejektorwirkung, welche dadurch
hervorgerufen wird, daß die nach außen gerichtete Luftströmung
der seitlichen Düsen 14 und 16 die zwischen
dem Bogen 2 und der Führungsfläche 4 in der mittleren
Zone 6 befindliche Luft mitreißt und nach außen transportiert,
so daß dieser Bereich evakuiert wird und ein
Unterdruck entsteht, wenn bei abgeschaltetem Gebläse
24, 124 bzw. geschlossenem Absperrventil 214 keine
oder nur wenig Luft durch die Düsen 12 nachströmt. Der
Bogen 2 wird daher mit seiner Unterseite im Bereich der
Zone 6 auf der Führungsfläche 4 angesaugt und gleitet
auf dieser, wodurch insbesondere beim Schöndruck eine
Straffung des Bogens 2 in Bogenlängsrichtung erfolgt,
welche zusammen mit der durch die nach außen
gerichtete Luftströmung in den seitlichen Zonen 8 und
10 erfolgenden seitlichen Straffung des Bogens 2 im
Schöndruckbetrieb der Druckmaschine einen störungsfreien
Bogenlauf gewährleistet.By switching off the blow air for the
Durch Ein- oder Ausschalten der Blasluft in der
mittleren Zone 6 kann somit in einfacher und bequemer
Weise zwischen dem Schön- und Widerdruckbetrieb
der Druckmaschine, bei welchem die Blasluft eingeschaltet
ist und eine in Fig. 3 gezeigte saubere Schwebeführung
des Bogens erfolgt, sowie dem in Fig. 4 gezeigten
Schöndruckbetrieb, bei welchem die unbedruckte
Bogenunterkante im Bereich der mittleren Zone
6 auf der Führungsfläche 4 gleitet, umgeschaltet werden.
Sofern also die Blasluft für einen sicheren Bogenlauf
im Schön- und Widerdruckbetrieb einmal eingestellt
ist, kann der Drucker zwischen den beiden Betriebsarten
Schöndruck und Schön- und Widerdruck durch Einund
Ausschalten der Blasluft in der Zone 6 innerhalb
kürzester Zeit umschalten, ohne weitere Anpassungen
der Luftmengen und Luftführung vornehmen zu müssen.
Darüberhinaus ergibt sich der Vorteil, daß für das
Ansaugen des Bogens in der Zone 6 im Schöndruckbetrieb
keinerlei Sauggebläse erforderlich ist und somit
der Geräteaufwand und der Energiebedarf der erfindungsgemäßen
Vorrichtung 1 in der Betriebsart Schöndruck
in hohem Maße reduziert werden kann.By switching the blowing air on or off in the
Claims (11)
- Sheet transport device for guiding sheet material in a printing press, the device having a guide surface (4) located below the sheet material and comprising nozzles (12, 14, 16) arranged in zones (6, 8, 10) within the guide surface (4), said zones including a first zone (6) extending along the longitudinal axis of the guide surface (4) and a second (8) and third zone (10) located at a respective side of the first zone (6), the nozzles (12) arranged in the first zone (6) being blowing nozzles having a blowing direction extending substantially in a sheet transport direction (A) and the nozzles (12) of the first zone (6) being suppliable with blown air independently of the nozzles (14, 16) of the second and third zones (8, 10)
characterized in that the nozzles (14, 16) arranged in the second and third zones (8, 10) are blowing nozzles having a blowing direction extending substantially away from the longitudinal axis of the guide surface (4) towards the lateral edges of the guide surface (4) and forming an angle of between 30° and 90° with the sheet transport direction,
that a blast box (18, 118) is associated with the first zone (16), said blast box supplying blown air to the nozzles (12) of the first zone (16),
that a first blower (24, 124, 200) associated with the blast box (18, 118) of the first zone (6) is provided, said first blower (24, 124, 200) supplying blown air to said blast box (18, 118), and
that means are provided for switching off the first blower (24, 124, 200) during operation in the straight printing mode of the printing press. - Sheet transport device for guiding sheet material in a printing press, the device having a guide surface (4) located below the sheet material and comprising nozzles (12, 14, 16) arranged in zones (6, 8, 10) within the guide surface (4), said zones including a first zone (6) extending along the longitudinal axis of the guide surface (4) and a second (8) and third zone (10) located at a respective side of the first zone (6), the nozzles (12) arranged in the first zone (6) being blowing nozzles having a blowing direction extending substantially in a sheet transport direction (A) and the nozzles (12) of the first zone (6) being suppliable with blown air independently of the nozzles (14, 16) of the second and third zones (8, 10)
characterized in that the nozzles (14, 16) arranged in the second and third zones (8, 10) are blowing nozzles having a blowing direction extending substantially away from the longitudinal axis of the guide surface (4) towards the lateral edges of the guide surface (4) and forming an angle of between 30° and 90° with the sheet transport direction, and
that means are provided by means of which the nozzles (12) of the first zone (6) are supplied with blown air via the associated blower (24, 124, 200) during operations in the perfecting mode, and by means of which the supply of blown air to the nozzles (12) of the first zone (6) via the corresponding blower (24, 124, 200) is interrupted during operation in the straight printing mode. - Device according to claim 2,
characterized in that the nozzles (12) arranged in the first zone (6) have a blowing direction comprising an additional component in the direction of the sides of the sheet guide surface (4). - Device according to one of the preceding claims,
characterized in that the nozzles (12) arranged in the first zone (6) have a blowing direction comprising a component in the direction of the surface normal of the guide surface (4). - Device according to one of the preceding claims,
characterized in that the nozzles (14, 16) arranged in the second and third zones (8, 10) have a blowing direction comprising a component in the direction of the surface normal of the guide surface. - Device according to one of the preceding claims,
characterized in that blowing nozzles are provided around the nozzles (12) in the first zone (6), said blowing nozzles having a blowing direction only comprising one component in the direction of the surface normal. - Device according to one of the preceding claims,
characterized in that a blast box (20, 22; 120, 122) is associated with the second and third zones (8, 10), the blast box (20, 22; 120, 122) supplying blown air to the nozzles (14, 16) arranged in the second and third zone (8, 10). - Device according to claim 7,
characterized in that the blast boxes (20, 22; 120, 122) of the second and third zones (8, 10) are supplied with blown air by a common blower (128) and/or by separate blowers (26, 28). - Device according to one of the preceding claims,
characterized in that means are provided via which, both during straight printing and perfecting operations of the printing press, the nozzles (14, 16) of the second and third zones (8, 10) are supplied with blown air by means of the associated blowers (26, 28, 200) - Device according to one of the preceding claims,
characterized in that the nozzles (12, 14, 16) of the zones (6, 8, 10) are formed as slit nozzles arranged in the guide surface (4). - Method for guiding sheets (2) in a sheet-fed rotary offset printing press which can be operated in both the straight printing mode and in the perfecting mode and in which the sheets (2) are transported at least in certain sections across a guide surface (4) having blowing nozzles (12, 14, 16) arranged in zones within the guide surface (4), with a first zone (6) extending along the longitudinal axis of the guide surface (4) and having nozzles (12) which blow air substantially in the sheet transport direction (A), and with a second (8) and third zone (10) located on both sides of the first zone (6) and having a blowing direction directed substantially away from the longitudinal axis of the guide surface,
characterized in that the nozzles (14, 16) of the second and third zones (8, 10) are supplied with blown air in both the straight printing and the perfecting mode, and that the nozzles (12) of the first zone (6) are supplied with blown air in the perfecting mode whereas the air supply to the nozzles (12) of the first zone (6) is interrupted in the straight printing mode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19607397A DE19607397A1 (en) | 1996-02-28 | 1996-02-28 | Device and method for guiding sheet material in a printing press, in particular in a sheet-fed offset printing press |
| DE19607397 | 1996-02-28 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0792742A1 EP0792742A1 (en) | 1997-09-03 |
| EP0792742B1 EP0792742B1 (en) | 2000-02-09 |
| EP0792742B2 true EP0792742B2 (en) | 2002-12-11 |
Family
ID=7786596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96118243A Expired - Lifetime EP0792742B2 (en) | 1996-02-28 | 1996-11-14 | Sheet transport device and method for guiding sheetlike material in a printing machine, specially in an offset rotary printing machine for sheets |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US5797327A (en) |
| EP (1) | EP0792742B2 (en) |
| JP (1) | JP3924343B2 (en) |
| DE (2) | DE19607397A1 (en) |
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- 1996-11-14 DE DE59604421T patent/DE59604421D1/en not_active Expired - Lifetime
-
1997
- 1997-02-26 JP JP04205497A patent/JP3924343B2/en not_active Expired - Fee Related
- 1997-02-28 US US08/808,783 patent/US5797327A/en not_active Expired - Lifetime
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1998
- 1998-05-15 US US09/079,585 patent/US5927203A/en not_active Expired - Lifetime
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Also Published As
| Publication number | Publication date |
|---|---|
| US5927203A (en) | 1999-07-27 |
| EP0792742A1 (en) | 1997-09-03 |
| US5797327A (en) | 1998-08-25 |
| EP0792742B1 (en) | 2000-02-09 |
| JP3924343B2 (en) | 2007-06-06 |
| JPH101238A (en) | 1998-01-06 |
| DE19607397A1 (en) | 1997-09-04 |
| DE59604421D1 (en) | 2000-03-16 |
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