EP0405166B1 - Device for smoothing the sheets on the impression cylinder of a sheet-fed rotary printing machine - Google Patents

Device for smoothing the sheets on the impression cylinder of a sheet-fed rotary printing machine Download PDF

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Publication number
EP0405166B1
EP0405166B1 EP90110278A EP90110278A EP0405166B1 EP 0405166 B1 EP0405166 B1 EP 0405166B1 EP 90110278 A EP90110278 A EP 90110278A EP 90110278 A EP90110278 A EP 90110278A EP 0405166 B1 EP0405166 B1 EP 0405166B1
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EP
European Patent Office
Prior art keywords
sheet
printing
impression cylinder
nozzle
blower nozzle
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
EP90110278A
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German (de)
French (fr)
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EP0405166A3 (en
EP0405166A2 (en
Inventor
Arno Wirz
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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
Priority to AT90110278T priority Critical patent/ATE102546T1/en
Publication of EP0405166A2 publication Critical patent/EP0405166A2/en
Publication of EP0405166A3 publication Critical patent/EP0405166A3/en
Application granted granted Critical
Publication of EP0405166B1 publication Critical patent/EP0405166B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F25/00—Devices for pressing sheets or webs against cylinders, e.g. for smoothing purposes
    • 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
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/12—Means using fluid made only for exhausting gaseous medium producing gas blast
    • B65H2406/122—Nozzles
    • B65H2406/1222—Nozzles adjustable impact angle

Definitions

  • the invention relates to a device for smooth application of printing sheets to the printing cylinder in front of the printing nip of a sheet-fed rotary printing press with generic features according to the preamble of patent claim 1.
  • EP-A-0 306 684 describes a device for sheet smoothing in a multicolor sheet-fed rotary printing press, which is arranged behind the printing nip above the printing cylinder of a printing unit and has blowing fingers which are arranged in a rotationally fixed manner on a blast finger tube over the width of the printing cylinder with a uniform spacing from one another , so that the blowing fingers in their lower area, which are provided with air outlet openings, have an air outlet surface adapted to the outer contour of the printing cylinder, which is guided up to the tangent point between a downstream arc-turning cylinder and the printing cylinder, the blowing fingers together with the blowing finger tube by means of an adjustment device in the straight printing from the direction Tangent point can be lifted off and stored on fixed machine parts in perfecting in the direction of the tangent point.
  • This device is thus effective behind the printing nip to smoothly apply the sheet printed in face-to-face printing in the area in front of the tangent point between a sheet turning cylinder and the upstream printing cylinder to the closed surface of the printing cylinder until the sheet end is detected by the sheet turning cylinder due to the action of flowing air.
  • this publication it also belongs to the prior art that axially parallel blow strips are distributed in front of the printing zone above a printing cylinder are arranged so that the sheet is smoothly spread on the surface of the impression cylinder by means of blowing air.
  • a device with a blowpipe and nozzles that can be adjusted in the blowing direction for blowing a printing sheet against a feed drum in a multi-color sheet-fed rotary printing press is known from DE-OS 25 50 721. However, it is not intended to smooth the printing sheet on the circumference of the printing cylinder.
  • DE-PS 1 061 798 arranged in front of the printing nip, smooth brushes which are effective against the circumference of the printing cylinder, are lifted off when passing the leading edge of the sheet and smoothly sweep the sheet against the printing cylinder after its leading edge has passed.
  • the invention solves this problem by training features according to the characterizing part of patent claim 1.
  • a particularly advantageous effect of the features of the invention is seen in connection with a sword nozzle effective as an air knife, the nozzle opening of which extends over a substantial part of the width of the printing cylinder, preferably over its entire width, and which is at a distance in front of the printing nip the circumference of the impression cylinder is directed.
  • the swivel angle with air outlet from the sword nozzle can be brought more or less close to the normal through the swivel axis of the blow nozzle onto the circumference of the printing cylinder. Closer to stiffer types of paper than thinner types of paper.
  • the sword nozzle swivels out of the air, possibly via the tangent to the pressure cylinder, through the pivot axis of the sword nozzle.
  • a swivel position can be achieved in which no air flow is effective on the printed sheet. When the sheet leading edge passes by, there is no blowing effect on the sheet, so that underblowing of the sheet is prevented.
  • This can be achieved in that the sword nozzle is swung into a tangent to the pressure cylinder through the pivot axis of the sword nozzle when the sheet leading edge passes, or in that an air control interrupts the blown air as the sheet leading edge passes.
  • a lever mechanism with cam control is suitable for driving the oscillating oscillating movement of the sword nozzle in the machine's work cycle.
  • a plurality of oscillating smoothing nozzles with the above-described training features can be arranged one behind the other in the circumferential direction of the printing cylinder. It is also possible to arrange an oscillating smoothing nozzle in connection with a blowing nozzle which may be adjustable in the blowing direction but is fixed during operation in front of the pressure gap or behind the pressure gap.
  • FIG. 1 shows schematically a side view of a printing unit of a multi-color sheet-fed rotary printing press.
  • the printed sheet 1 taken over from a preceding printing unit is from a transfer drum 2 to the printing cylinder 3 of a subsequent printing unit.
  • the sheet grippers 4 grip the printing sheet 1 at the tangent point between the transfer drum 2 and the printing cylinder 3 and pull the printing sheet 1 through the printing gap 5 between the printing cylinder 3 and the blanket cylinder 6. Behind the printing gap 5, the printing sheet 1 is fed to a further transfer drum 7 which passes the printed sheet 1 to another printing unit.
  • a blowing nozzle 8 is directed against the circumference of the printing cylinder 3 at a certain distance in front of the printing gap 5 and is mounted such that it can oscillate about a pendulum axis 9 and can be coupled to a drive that drives the Blowing nozzle 8 moves back and forth in the machine's working cycle, swinging in the direction of travel of the sheet.
  • the blowing nozzle 8 is particularly advantageously designed as a sword nozzle according to the illustration in FIG. 2, the nozzle opening of which extends at least over a substantial part of the width of the printing cylinder 3, advantageously over its entire width.
  • the angular range for the oscillating movement of the blowing nozzle 8 is adjustable, in such a way that both the angle of attack alpha (FIGS. 5 and 6) of the blowing direction with respect to the normal 10 through the pendulum axis 9 on the circumference of the printing cylinder 3 and the pivoting angle beta ( 1 and 4) are adjustable.
  • the blowing nozzle 8 is fastened to a tube 11 which is adjustable in the circumferential direction thereof and which is mounted in the frame 12 of the machine so that it can swing about its longitudinal axis.
  • a lever mechanism 13 with a cam control or the like is suitable for driving the pendulum movement of the blowing nozzle 8, and in the case of the example intended.
  • the blow nozzle 8 is pushed with a tubular housing 17 onto the jacket of a valve collar 14, which is adjustable relative to a frame part 15 by means of a screw 16.
  • the valve collar 14 is guided laterally by a driver 18.
  • a radially directed connection 19 for the air line passes through the housing 17 and is fastened with the inner end in the valve collar 14.
  • this connection can be moved radially in a range corresponding to the setting angle range.
  • an adjustment can be made to change the angle of attack alpha relative to the normal 10.
  • the pivot angle beta is set in the selected embodiment by the lever gear 13.
  • the air control for the blower nozzle takes place by covering radial openings in the tube 11 with the inner end of the connection 19 or the passage in the housing 17 to the blower nozzle 8. At the smallest angle of attack alpha, the air flow from the blower nozzle 8 is almost perpendicular to the outer surface of the printing cylinder 3 directional.
  • the center of the pendulum movements of the blowing nozzle 8 lies approximately on the tangent to the printing cylinder 3, which is defined by the pendulum axis 9, so that the blowing nozzle 8 comes out of a pivoted-back zero position without air supply, which is shown in FIG. 3 with full lines and in FIG. 4 with dashed lines is oscillating until it reaches a front position, which is shown in FIG. 4 with solid lines.
  • This has the advantage that, especially when processing cardboard sheets in machines with bypass drums without a cover sheet in the swiveling angle range beta 1, an air stream can be directed onto the rear end of the sheet in order to press it away from the shaft of the bypass drum 2 and thus prevent signs of smearing.
  • the air pushes out of the Blower nozzle 8 against the circumference of the printing cylinder 3.
  • the swiveling movement of the blowing nozzle 8 advantageously takes place against the running direction of the sheet 1 on the circumference of the printing cylinder 3.
  • the air flow from the blowing nozzle 8 can be interrupted when the leading edge of the printing sheet 1 runs past, or the blowing nozzle can be in a swivel position which prevents the passing printing sheet from blowing on its leading edge.
  • the blower nozzle 8 can advantageously be fixed in the swiveled-back end position, as is shown, for example, in FIG. 4 with dashed lines, or can be uncoupled from the drive in order to enable a shutdown when the blower nozzle is not required for printing processes.
  • a further pendulum nozzle 20 is indicated schematically, which can be coupled to the tube 11 or the lever gear 13 by a further lever gear 21.
  • the pendulum angle of the nozzle 20 can deviate from the pendulum angle of the nozzle 8 and the set angle of attack can also be different.
  • an adjustable nozzle that is stationary during operation can also be provided at this point.

Abstract

A device for smoothly applying a sheet for printing onto an impression cylinder upstream of a printing gap of a sheet-fed rotary offset printing machine in travel direction of the sheet through the printing machine and including at least one jet nozzle capable of being directed towards the circumference of the impression cylinder for pressing the sheet by blowing air force against the circumference, comprising drive means for swingingly reciprocating the jet nozzle in travel direction of the sheet during an operating cycle of the printing machine, the jet nozzle being mounted at a spaced distance and upstream from a printing gap and being swingable in a pendular manner about a pendulum axis extending parallel to an axis of the impression cylinder, the jet nozzle being couplable with the drive means.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum glatten Anlegen von Druckbogen am Druckzylinder vor dem Druckspalt einer Bogenrotationsdruckmaschine mit Gattungsmerkmalen nach dem Oberbegriff des Patentanspruches 1.The invention relates to a device for smooth application of printing sheets to the printing cylinder in front of the printing nip of a sheet-fed rotary printing press with generic features according to the preamble of patent claim 1.

Die EP-A-0 306 684 beschreibt eine Vorrichtung zur Bogenglättung in einer Mehrfarben-Bogenrotationsdruckmaschine, die hinter dem Druckspalt oberhalb des Druckzylinders eines Druckwerkes angeordnet ist und Blasfinger aufweist, die über die Breite des Druckzylinders mit gleichmäßigem Abstand voneinander an einem Blasfingerrohr drehfest angeordnet sind, so daß die Blasfinger in ihrem unteren, mit Luftaustrittsöffnungen versehenen Bereich eine der Außenkontur des Druckzylinders angepaßte Luftaustrittsfläche aufweisen, die bis zum Tangentenpunkt zwischen einem nachgeordneten Bogenwendezylinder und dem Druckzylinder geführt ist, wobei die Blasfinger zusammen mit dem Blasfingerrohr mittels einer Verstelleinrichtung im Schöndruck aus Richtung Tangentenpunkt abhebbar sowie im Schön- und Widerdruck in Richtung Tangentenpunkt absenkbar an festen Maschinenteilen gelagert sind. Diese Vorrichtung ist somit hinter dem Druckspalt wirksam, um den im Schöndruck bedruckten Bogen im Bereich vor dem Tangentenpunkt zwischen einem Bogenwendezylinder und dem vorgeordneten Druckzylinder an die geschlossene Oberfläche des Druckzylinders bis zum Erfassen des Bogenendes durch den Bogenwendezylinder durch die Wirkung strömender Luft glatt anzulegen. Zum Stand der Technik gehört es nach dieser Druckschrift jedoch auch, daß achsparallele Blasleisten vor der Druckzone oberhalb eines Druckzylinders verteilt angeordnet sind, so daß der Bogen auf der Oberfläche des Druckzylinders mittels Blasluft glatt aufgestrichen wird.EP-A-0 306 684 describes a device for sheet smoothing in a multicolor sheet-fed rotary printing press, which is arranged behind the printing nip above the printing cylinder of a printing unit and has blowing fingers which are arranged in a rotationally fixed manner on a blast finger tube over the width of the printing cylinder with a uniform spacing from one another , so that the blowing fingers in their lower area, which are provided with air outlet openings, have an air outlet surface adapted to the outer contour of the printing cylinder, which is guided up to the tangent point between a downstream arc-turning cylinder and the printing cylinder, the blowing fingers together with the blowing finger tube by means of an adjustment device in the straight printing from the direction Tangent point can be lifted off and stored on fixed machine parts in perfecting in the direction of the tangent point. This device is thus effective behind the printing nip to smoothly apply the sheet printed in face-to-face printing in the area in front of the tangent point between a sheet turning cylinder and the upstream printing cylinder to the closed surface of the printing cylinder until the sheet end is detected by the sheet turning cylinder due to the action of flowing air. According to this publication, however, it also belongs to the prior art that axially parallel blow strips are distributed in front of the printing zone above a printing cylinder are arranged so that the sheet is smoothly spread on the surface of the impression cylinder by means of blowing air.

Eine Vorrichtung mit einem Blasrohr und daran in der Blasrichtung einstellbaren Düsen zum Anblasen eines Druckbogens gegen eine Zuführtrommel in einer Mehrfarben-Bogenrotationsdruckmaschine ist aus der DE-OS 25 50 721 bekannt. Sie ist jedoch nicht zum Glattstreichen des Druckbogens am Umfang des Druckzylinders bestimmt.A device with a blowpipe and nozzles that can be adjusted in the blowing direction for blowing a printing sheet against a feed drum in a multi-color sheet-fed rotary printing press is known from DE-OS 25 50 721. However, it is not intended to smooth the printing sheet on the circumference of the printing cylinder.

Die Steuerung der Blasluft für Vorrichtungen nach dem Stande der Technik ist aus der DE-OS 36 35 089 bekannt. Schließlich beschreibt die DE-PS 1 061 798 vor dem Druckspalt angeordnete, gegen den Umfang des Druckzylinders wirksame Glattstreichbürsten, die beim Passieren der Bogenvorderkante abgehoben sind und den Bogen, nachdem dessen Vorderkante vorbeigelaufen ist, glatt gegen den Druckzylinder streichen.The control of the blown air for devices according to the prior art is known from DE-OS 36 35 089. Finally, DE-PS 1 061 798, arranged in front of the printing nip, smooth brushes which are effective against the circumference of the printing cylinder, are lifted off when passing the leading edge of the sheet and smoothly sweep the sheet against the printing cylinder after its leading edge has passed.

Es ist Aufgabe der Erfindung, eine Vorrichtung zum Bogenglätten am Umfang des Druckzylinders vor dem Druckspalt einer Bogenrotationsdruckmaschine in der Weise zu verbessern, daß ein sicheres, sattes Auflegen des Druckbogens auf dem Druckzylinder, unabhängig von der Papiersorte des Druckbogens, vor dessen Einlauf in den Druckspalt und eine größere Sicherheit für einen dublierfreien und abschmierfreien Druck auch bei höheren Druckgeschwindigkeiten erreicht wird.It is an object of the invention to improve a device for sheet smoothing on the circumference of the printing cylinder in front of the printing nip of a sheet-fed rotary printing press in such a way that a secure, full placement of the printing sheet on the printing cylinder, regardless of the type of paper of the printing sheet, before it enters the printing nip and greater security for duplication-free and smear-free printing is achieved even at higher printing speeds.

Die Erfindung löst diese Aufgabe durch Ausbildungsmerkmale nach dem Kennzeichen des Patentanspruches 1.The invention solves this problem by training features according to the characterizing part of patent claim 1.

Diese Ausbildungsmerkmale vermehren die Möglichkeiten zur berührungslosen Einwirkung auf den Druckbogen zum Zwecke der Erzielung einer sicheren und satten Anlage am Druckzylinder vor dem Einlauf des Druckbogens in den Druckspalt und verbessert die Möglichkeiten der Einflußnahme gegenüber bekannten Einrichtungen.These training features increase the possibilities for contactless action on the printing sheet for the purpose of achieving a safe and full contact with the printing cylinder before the entry of the printed sheet into the printing nip and improves the possibilities of exerting influence over known devices.

In weiterer Ausgestaltung der Erfindung wird eine besonders vorteilhafte Wirkung der Erfindungsmerkmale in Verbindung mit einer als Luftrakel wirksamen Schwertdüse gesehen, deren Düsenöffnung sich über einen wesentlichen Teil der Breite des Druckzylinders, vorzugsweise über seine gesamte Breite, erstreckt und die mit einem Abstand vor dem Druckspalt gegen den Umfang des Druckzylinders gerichtet ist.In a further embodiment of the invention, a particularly advantageous effect of the features of the invention is seen in connection with a sword nozzle effective as an air knife, the nozzle opening of which extends over a substantial part of the width of the printing cylinder, preferably over its entire width, and which is at a distance in front of the printing nip the circumference of the impression cylinder is directed.

Der Schwenkwinkel mit Luftaustritt aus der Schwertdüse kann in Abhängigkeit von der zu bedruckenden Papiersorte mehr oder weniger nahe an die Normale durch die Schwenkachse der Blasdüse auf den Umfang des Druckzylinders herangeführt werden. Bei steiferen Papiersorten näher als bei dünneren Papiersorten. In der Gegenrichtung schwenkt die Schwertdüse unter Luftaustritt über die Tangente an den Druckzylinder durch die Schwenkachse der Schwertdüse gegebenenfalls hinaus. Dabei kann eine Schwenkposition erreicht werden, in der kein Luftstrom mehr auf den Druckbogen wirksam ist. Beim Vorbeilaufen der Bogenvorderkante erfolgt keine Blaswirkung auf den Bogen, so daß ein Unterblasen des Bogens verhindert wird. Dies kann dadurch erreicht werden, daß die Schwertdüse beim Vorbeilaufen der Bogenvorderkante in eine über die Tangente an den Druckzylinder durch die Schwenkachse der Schwertdüse hinausgeschwenkt ist, oder dadurch, daß eine Luftsteuerung die Blasluft beim Vorbeilaufen der Bogenvorderkante unterbricht.Depending on the type of paper to be printed, the swivel angle with air outlet from the sword nozzle can be brought more or less close to the normal through the swivel axis of the blow nozzle onto the circumference of the printing cylinder. Closer to stiffer types of paper than thinner types of paper. In the opposite direction, the sword nozzle swivels out of the air, possibly via the tangent to the pressure cylinder, through the pivot axis of the sword nozzle. A swivel position can be achieved in which no air flow is effective on the printed sheet. When the sheet leading edge passes by, there is no blowing effect on the sheet, so that underblowing of the sheet is prevented. This can be achieved in that the sword nozzle is swung into a tangent to the pressure cylinder through the pivot axis of the sword nozzle when the sheet leading edge passes, or in that an air control interrupts the blown air as the sheet leading edge passes.

Für den Antrieb der schwingenden Pendelbewegung der Schwertdüse im Arbeitstakt der Maschine ist beispielsweise ein Hebelgetrieb mit einer Kurvensteuerung geeignet.For example, a lever mechanism with cam control is suitable for driving the oscillating oscillating movement of the sword nozzle in the machine's work cycle.

Gegebenenfalls können mehrere schwingend bewegte Glattstreichdüsen mit vorbeschriebenen Ausbildungsmerkmalen in Umfangsrichtung des Druckzylinders hintereinander angeordnet sein. Auch die Anordnung einer schwingenden Glattstreichdüse in Verbindung mit einer gegebenenfalls in der Blasrichtung einstellbaren, im Betrieb jedoch feststehenden Blasdüse vor dem Druckspalt oder hinter dem Druckspalt ist möglich.If necessary, a plurality of oscillating smoothing nozzles with the above-described training features can be arranged one behind the other in the circumferential direction of the printing cylinder. It is also possible to arrange an oscillating smoothing nozzle in connection with a blowing nozzle which may be adjustable in the blowing direction but is fixed during operation in front of the pressure gap or behind the pressure gap.

Die Unteransprüche 3 bis 7 betreffen vorteilhafte Gestaltungsmerkmale der Erfindung.The subclaims 3 to 7 relate to advantageous design features of the invention.

Auf der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt.In the drawing, an embodiment of the invention is shown schematically.

Es zeigen:

Figur 1
eine Seitenansicht eines Druckwerks,
Figur 2
eine im Maßstab gegenüber Figur 1 vergrößerte Ansicht der Glattstreichdüse in Laufrichtung des Druckbogens,
Figuren 3 und 4
Querschnitte durch die Anordnung entsprechend Figur 2 in zwei einstellbaren, jedoch unterschiedlichen Endpositionen,
Figuren 5 und 6
unterschiedliche Anstellwinkel der Blasrichtung in Abhängigkeit von der Qualität des zu bedruckenden Papiers.
Show it:
Figure 1
a side view of a printing unit,
Figure 2
2 shows an enlarged view of the smoothing nozzle in the running direction of the printed sheet, on a scale compared to FIG. 1,
Figures 3 and 4
Cross sections through the arrangement according to Figure 2 in two adjustable, but different end positions,
Figures 5 and 6
different angles of attack of the blowing direction depending on the quality of the paper to be printed.

Das Ausführungsbeispiel der Figur 1 zeigt schematisch eine Seitenansicht eines Druckwerks einer Mehrfarben-Bogenrotationsdruckmaschine. Der von einem vorausgehenden Druckwerk übernommene Druckbogen 1 wird von einer Überführungstrommel 2 dem Druckzylinder 3 eines nachfolgenden Druckwerks übergeben. Die Bogengreifer 4 erfassen den Druckbogen 1 im Tangentenpunkt zwischen der Überführungstrommel 2 und dem Druckzylinder 3 und ziehen den Druckbogen 1 durch den Druckspalt 5 zwischen dem Druckzylinder 3 und dem Gummituchzylinder 6. Hinter dem Druckspalt 5 wird der Druckbogen 1 einer weiteren Überführungstrommel 7 zugeführt, die den Druckbogen 1 an ein weiteres Druckwerk übergibt.The embodiment of Figure 1 shows schematically a side view of a printing unit of a multi-color sheet-fed rotary printing press. The printed sheet 1 taken over from a preceding printing unit is from a transfer drum 2 to the printing cylinder 3 of a subsequent printing unit. The sheet grippers 4 grip the printing sheet 1 at the tangent point between the transfer drum 2 and the printing cylinder 3 and pull the printing sheet 1 through the printing gap 5 between the printing cylinder 3 and the blanket cylinder 6. Behind the printing gap 5, the printing sheet 1 is fed to a further transfer drum 7 which passes the printed sheet 1 to another printing unit.

Zur Erzielung einer sicheren und satten Anlage des Druckbogens 1 an den Umfang des Druckzylinders 3 ist mit einem gewissen Abstand vor dem Druckspalt 5 eine Blasdüse 8 gegen den Umfang des Druckzylinders 3 gerichtet und um eine Pendelachse 9 pendelbar gelagert sowie mit einem Antrieb kuppelbar, der die Blasdüse 8 im Arbeitstakt der Maschine schwingend in Laufrichtung des Bogens vor- und zurückbewegt. Die Blasdüse 8 wird mit besonderem Vorteil als eine Schwertdüse entsprechend der Darstellung in Figur 2 ausgebildet, deren Düsenöffnung sich wenigstens über einen wesentllchen Teil der Breite des Druckzylinders 3, vorteilhaft über dessen gesamte Breite, erstreckt. Der Winkelbereich für die schwingende Bewegung der Blasdüse 8 ist einstellbar, und zwar so, daß sowohl der Anstellwinkel alpha (Fig. 5 und 6) der Blasrichtung gegenüber der Normalen 10 durch die Pendelachse 9 auf den Umfang des Druckzylinders 3 als auch der Schwenkwinkel beta (Fig. 1 und 4) einstellbar sind.In order to achieve a secure and full contact of the printing sheet 1 with the circumference of the printing cylinder 3, a blowing nozzle 8 is directed against the circumference of the printing cylinder 3 at a certain distance in front of the printing gap 5 and is mounted such that it can oscillate about a pendulum axis 9 and can be coupled to a drive that drives the Blowing nozzle 8 moves back and forth in the machine's working cycle, swinging in the direction of travel of the sheet. The blowing nozzle 8 is particularly advantageously designed as a sword nozzle according to the illustration in FIG. 2, the nozzle opening of which extends at least over a substantial part of the width of the printing cylinder 3, advantageously over its entire width. The angular range for the oscillating movement of the blowing nozzle 8 is adjustable, in such a way that both the angle of attack alpha (FIGS. 5 and 6) of the blowing direction with respect to the normal 10 through the pendulum axis 9 on the circumference of the printing cylinder 3 and the pivoting angle beta ( 1 and 4) are adjustable.

Die Blasdüse 8 ist dazu an einem Rohr 11 in dessen Umfangsrichtung verstellbar befestigt, welches um seine Längsachse schwingend pendelbar im Gestell 12 der Maschine gelagert ist. Für den Antrieb der Pendelbewegung der Blasdüse 8 ist ein Hebelgetriebe 13 mit einer Kurvensteuerung oder dergleichen geeignet und im Falle des Beispieles vorgesehen. Die Blasdüse 8 ist mit einem rohrförmigen Gehäuse 17 auf den Mantel eines Ventilstellringes 14 aufgeschoben, der gegenüber einem Gestellteil 15 mittels einer Schraube 16 einstellbar ist. Der Ventilstellring 14 ist durch einen Mitnehmer 18 seitlich geführt. Ein radial gerichteter Anschluß 19 für die auf der Zeichnung nicht dargestellte Luftleitung durchgreift das Gehäuse 17 und ist mit dem inneren Ende in dem Ventilstellring 14 befestigt. Zum Zwecke der Einstellung ist dieser Anschluß radial in einem dem Einstellwinkelbereich entsprechenden Bereich beweglich. Nach dem Lösen der Schraube 16 und des Mitnehmers 18 kann eine Verstellung zur Änderung des Anstellwinkels alpha gegenüber der Normalen 10 vorgenommen werden. Der Schwenkwinkel beta wird bei dem gewählten Ausführungsbeispiel durch das Hebelgetriebe 13 eingestellt. Die Luftsteuerung für die Blasdüse erfolgt durch die Überdeckung radialer Öffnungen im Rohr 11 mit dem inneren Ende des Anschlusses 19 bzw. des Durchganges in dem Gehäuse 17 zu der Blasdüse 8. Im kleinsten Anstellwinkel alpha ist der Luftstrom aus der Blasdüse 8 nahezu senkrecht auf die Mantelfläche des Druckzylinders 3 richtbar. Die Mitte der Pendelbewegungen der Blasdüse 8 liegt etwa auf der durch die Pendelachse 9 gelegten Tangente an den Druckzylinder 3, so daß die Blasdüse 8 aus einer zurückgeschwenkten Nullage heraus ohne Luftzufuhr, die in Figur 3 mit vollen Linien und in Figur 4 mit gestrichelten Linien dargestellt ist, bis in eine vordere Position, die in Figur 4 mit vollen Linien dargestellt ist, sich pendelnd bewegt. Dies hat den Vorteil, daß insbesondere bei der Verarbeitung von Kartonbögen in Maschinen mit Umführungstrommeln ohne Mantelblech in dem Schwenkwinkelbereich beta 1 ein Luftstrom auf das hintere Ende des Bogens gerichtet werden kann, um dieses von der Welle der Umführungstrommel 2 wegzudrücken und so Abschmiererscheinungen zu verhindern. Im vorderen Schwenkwinkelbereich beta 2 drückt die Luft aus der Blasdüse 8 den Bogen gegen den Umfang des Druckzylinders 3. Die Schwenkbewegung der Blasdüse 8 erfolgt dabei vorteilhaft entgegen der Laufrichtung des Bogens 1 auf dem Umfang des Druckzylinders 3.For this purpose, the blowing nozzle 8 is fastened to a tube 11 which is adjustable in the circumferential direction thereof and which is mounted in the frame 12 of the machine so that it can swing about its longitudinal axis. A lever mechanism 13 with a cam control or the like is suitable for driving the pendulum movement of the blowing nozzle 8, and in the case of the example intended. The blow nozzle 8 is pushed with a tubular housing 17 onto the jacket of a valve collar 14, which is adjustable relative to a frame part 15 by means of a screw 16. The valve collar 14 is guided laterally by a driver 18. A radially directed connection 19 for the air line, not shown in the drawing, passes through the housing 17 and is fastened with the inner end in the valve collar 14. For the purpose of setting, this connection can be moved radially in a range corresponding to the setting angle range. After loosening the screw 16 and the driver 18, an adjustment can be made to change the angle of attack alpha relative to the normal 10. The pivot angle beta is set in the selected embodiment by the lever gear 13. The air control for the blower nozzle takes place by covering radial openings in the tube 11 with the inner end of the connection 19 or the passage in the housing 17 to the blower nozzle 8. At the smallest angle of attack alpha, the air flow from the blower nozzle 8 is almost perpendicular to the outer surface of the printing cylinder 3 directional. The center of the pendulum movements of the blowing nozzle 8 lies approximately on the tangent to the printing cylinder 3, which is defined by the pendulum axis 9, so that the blowing nozzle 8 comes out of a pivoted-back zero position without air supply, which is shown in FIG. 3 with full lines and in FIG. 4 with dashed lines is oscillating until it reaches a front position, which is shown in FIG. 4 with solid lines. This has the advantage that, especially when processing cardboard sheets in machines with bypass drums without a cover sheet in the swiveling angle range beta 1, an air stream can be directed onto the rear end of the sheet in order to press it away from the shaft of the bypass drum 2 and thus prevent signs of smearing. In the front swivel angle range beta 2 the air pushes out of the Blower nozzle 8 against the circumference of the printing cylinder 3. The swiveling movement of the blowing nozzle 8 advantageously takes place against the running direction of the sheet 1 on the circumference of the printing cylinder 3.

Zur Vermeidung des Unterblasens des Druckbogens kann der Luftstrom aus der Blasdüse 8 beim Vorbeilaufen der Vorderkante des Druckbogens 1 unterbrochen sein oder die Blasdüse sich in einer Schwenklage befinden, die ein Unterblasen des vorbeilaufenden Druckbogens an seiner Vorderkante verhindert.In order to avoid the blowing of the printing sheet, the air flow from the blowing nozzle 8 can be interrupted when the leading edge of the printing sheet 1 runs past, or the blowing nozzle can be in a swivel position which prevents the passing printing sheet from blowing on its leading edge.

Die Blasdüse 8 ist in der zurückgeschwenkten Endlage, wie sie beispielsweise in der Figur 4 mit gestrichelten Linien dargestellt ist, vorteilhaft festsetzbar oder vom Antrieb abkuppelbar, um eine Abschaltung zu ermöglichen, wenn die Blasdüse für Druckvorgänge nicht benötigt wird.The blower nozzle 8 can advantageously be fixed in the swiveled-back end position, as is shown, for example, in FIG. 4 with dashed lines, or can be uncoupled from the drive in order to enable a shutdown when the blower nozzle is not required for printing processes.

Anstelle der beschriebenen Steuerung der Luftzufuhr zu der Blasdüse 8 durch die Pendelbewegung der Blasdüse selbst können auch andere an sich bekannte Einrichtungen verwendet werden.Instead of the described control of the air supply to the blow nozzle 8 by the pendulum movement of the blow nozzle itself, other devices known per se can also be used.

In der Figur 1 ist schematisch die Möglichkeit der Anordnung einer weiteren Pendeldüse 20 angedeutet, die durch ein weiteres Hebelgetriebe 21 mit dem Rohr 11 bzw. dem Hebelgetriebe 13 kuppelbar ist. Dabei kann der Pendelwinkel der Düse 20 von dem Pendelwinkel der Düse 8 abweichen und ebenso der eingestellte Anstellwinkel unterschiedlich sein. Anstelle einer Pendeldüse 20 kann an dieser Stelle auch eine zwar einstellbare, im Betrieb jedoch feststehende Düse vorgesehen sein. BEZUGSZEICHENLISTE 1 Druckbogen 10 Normale 2 Überführungstrommel 11 Rohr 3 Druckzylinder 12 Gestell der Maschine 4 Bogengreifer 13 Hebelgetriebe 5 Druckspalt 14 Ventilstellring 6 Gummituchzylinder 15 Gestellteil 7 Überführungstrommel 16 Schraube 8 Blasdüse 17 Gehäuse 9 Pendelachse 18 Mitnehmer 19 Anschluß für Luft 20 Pendeldüse 21 Hebelgetriebe In Figure 1, the possibility of arranging a further pendulum nozzle 20 is indicated schematically, which can be coupled to the tube 11 or the lever gear 13 by a further lever gear 21. The pendulum angle of the nozzle 20 can deviate from the pendulum angle of the nozzle 8 and the set angle of attack can also be different. Instead of an oscillating nozzle 20, an adjustable nozzle that is stationary during operation can also be provided at this point. REFERENCE SIGN LIST 1 Printed sheet 10th Normal 2nd Transfer drum 11 pipe 3rd Impression cylinder 12th Frame of the machine 4th Bow grab 13 Lever gear 5 Pressure gap 14 Valve collar 6 Blanket cylinder 15 Frame part 7 Transfer drum 16 screw 8th Blow nozzle 17th casing 9 Swing axle 18th Carrier 19th Connection for air 20th Pendulum nozzle 21 Lever gear

Claims (7)

  1. Device for placing printing sheets (1) smoothly against the impression cylinder (3) ahead of the nip (5) of a sheet-fed rotary offset printing machine, in which at least one blower nozzle (8) is provided, which can be directed against the circumference of the impression cylinder (3) for pressing on the sheet (1) by the dynamic effect of flowing air, characterized in that the blower nozzle (8) is mounted with spacing ahead of the nip (5) so as to be able to oscillate about a full floating axle (9) lying parallel to the axis of the impression cylinder (3) and can be coupled to a drive which moves the blower nozzle (8) back and forth, oscillating in the running direction of the printing sheet (1), in the operating cycle of the machine.
  2. Device according to Claim 1, characterized in that a lance nozzle acting as an air doctor blade is directed onto the circumference of the impression cylinder (3) in the running direction of the printing sheet (1) ahead of the nip (5), the nozzle aperture of said lance nozzle extending over a substantial part of the width, preferably over the entire width, of the impression cylinder (3).
  3. Device according to Claims 1 and 2, characterized in that the blower nozzle (8) can be pivoted with its blowing direction counter to the running direction of the printing sheet (1) into a position beyond the tangent running through its full floating axle (9) onto the circumference of the impression cylinder (3).
  4. Device according to the preceding claims, characterized in that the blower nozzle (8) can be driven with oscillating movement in the running direction of the printing sheet (1) into a position approximately perpendicular to the circumferential direction of the impression cylinder (3).
  5. Device according to one of the preceding claims, characterized in that the air flow of the blower nozzle (8) which can be driven in oscillation can be controlled and regulated by the oscillating movement of the blower nozzle (8) in the operating cycle of the machine.
  6. Device according to one of the preceding claims, characterized in that the blower nozzle (8) which can be driven with oscillating movement can be fixed in a pivoted-back rest position.
  7. Device according to one of the preceding claims, characterized in that, in addition to a blower nozzle (8) which can be driven in oscillation, at least one further blower nozzle of fixed arrangement is directed against the circumference of the impression cylinder (3) and can be regulated in its air flow.
EP90110278A 1989-06-24 1990-05-30 Device for smoothing the sheets on the impression cylinder of a sheet-fed rotary printing machine Expired - Lifetime EP0405166B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90110278T ATE102546T1 (en) 1989-06-24 1990-05-30 DEVICE FOR SHEET STRAIGHTENING ON THE PRINTING CYLINDER IN A SHEET-FED ROTARY PRINTING PRESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3920730A DE3920730A1 (en) 1989-06-24 1989-06-24 DEVICE FOR ARC SMOOTHING ON THE PRINT CYLINDER IN AN ARC ROTATION PRINTING MACHINE
DE3920730 1989-06-24

Publications (3)

Publication Number Publication Date
EP0405166A2 EP0405166A2 (en) 1991-01-02
EP0405166A3 EP0405166A3 (en) 1991-07-31
EP0405166B1 true EP0405166B1 (en) 1994-03-09

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EP90110278A Expired - Lifetime EP0405166B1 (en) 1989-06-24 1990-05-30 Device for smoothing the sheets on the impression cylinder of a sheet-fed rotary printing machine

Country Status (7)

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US (1) US5086698A (en)
EP (1) EP0405166B1 (en)
JP (1) JPH0336033A (en)
CN (1) CN1017034B (en)
AT (1) ATE102546T1 (en)
CA (1) CA2015948C (en)
DE (2) DE3920730A1 (en)

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Also Published As

Publication number Publication date
DE59004865D1 (en) 1994-04-14
DE3920730A1 (en) 1991-01-10
CN1048353A (en) 1991-01-09
DE3920730C2 (en) 1991-10-10
EP0405166A3 (en) 1991-07-31
ATE102546T1 (en) 1994-03-15
JPH0336033A (en) 1991-02-15
CA2015948C (en) 1995-01-17
CN1017034B (en) 1992-06-17
CA2015948A1 (en) 1990-12-24
EP0405166A2 (en) 1991-01-02
US5086698A (en) 1992-02-11

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