EP0895860B1 - Device for preventing damages of a printing unit - Google Patents

Device for preventing damages of a printing unit Download PDF

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Publication number
EP0895860B1
EP0895860B1 EP98113629A EP98113629A EP0895860B1 EP 0895860 B1 EP0895860 B1 EP 0895860B1 EP 98113629 A EP98113629 A EP 98113629A EP 98113629 A EP98113629 A EP 98113629A EP 0895860 B1 EP0895860 B1 EP 0895860B1
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EP
European Patent Office
Prior art keywords
web
proceding
monitors
controller
deflection
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
EP98113629A
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German (de)
French (fr)
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EP0895860A2 (en
EP0895860A3 (en
Inventor
Andreas Birkenfeld
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Baldwin Germany GmbH
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Baldwin Germany GmbH
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Publication date
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Publication of EP0895860A3 publication Critical patent/EP0895860A3/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
    • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
    • B65H26/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs
    • B65H26/025—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs responsive to web breakage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/18—Web break detection
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
    • B65H2553/41—Photoelectric detectors

Definitions

  • the invention relates to a device for the detection of Web defects to prevent damage to the printing unit in a web-fed rotary printing press that is one of a roll that fed on a reel changer, fed web printed, in which an error detection device is provided, which each have a deflection device in the area of both web edges, by means of one with trouble-free operation of the train surmountable, acting transversely to the transport level of the train Deflection force can be generated, and one change each Detecting observation device, the optical Axis essentially opposite to the transport plane of the train perpendicular direction of the deflection force at least in the longitudinal direction the web is tilted, the two observation devices the error detection device as fiber optic sensors are trained.
  • Such a device is known from US-A 5 389 795. at this known arrangement is the observation device practically designed as a light barrier, in which a between Transmitter and receiver, linear light beam is produced. This is from an undamaged track interrupted and intervenes in the event of a train damage Transmitter and receiver through. The known arrangement is therefore able to generate a yes-no signal.
  • the transmitters and receivers of the fiber optic sensors in one that can be pressurized with compressed air, with a small nozzle-shaped opening provided the housing of each assigned deflection device arranged.
  • DE-A 36 40 101 shows a device for preventing Damage to printing unit in a web-fed rotary printing press with an error detection device that before the first Printing unit is arranged.
  • the Fault detection device in front of the first printing unit Rotary printing press is arranged that the fiber-optic sensors of the error detection device Output a signal dependent on the shadowing caused by the web and that the the transmitter and receiver of the fiber optic Optical fiber fibers forming sensors each inform of elongated Rows of fibers in a slot facing one of the web provided, own housing, the end with compressed air is acted upon as at the ends of the fiber rows Flushing purge air escapes through the slot.
  • the Design of the elements of the fiber optic according to the invention Sensors advantageously results in a wide band of light that the web is more or less shadowed.
  • the flushing of the fiber ends of transmitter and receiver arranged in rows the fiber optic sensors with compressed air, which with the for Deflection of the web used compressed air has nothing to do enables reliable flushing and keeping the Fiber ends so that the width of the light band even with robust Operating conditions due to pollution etc. not can be affected. From the degree of shadowing wide strips of light through the web is therefore the size of everyone relevant, lateral web defects and in particular also the Previously very feared glue errors can be recorded directly in terms of amount.
  • the measures according to the invention accordingly offer in advantageously guarantee that not only found is that there is an error at all, but also which one Errors, so that the initiation is more appropriate in each individual case Remedial action is possible. Since the invention Measures depending on the degree of shadowing, i.e. a can generate an amount-dependent signal in an advantageous manner a tolerance band can also be permitted within which Fluctuations are tolerated. Since the detection device according to the invention even before the first Printing unit is arranged and web defects, which are usually in the amount of the first pressure wave could lead to side winders recognizes, can be traced back to this Avoid damage to the printing unit reliably.
  • the structure and mode of operation of web-fed rotary printing presses as well as this parent Role changers are known per se and therefore require in no further explanation in the present context.
  • the Figure 1 shows a first printing unit 1 Web-fed rotary printing press, one of which is unwound from a roll 2 Lane 3 is fed. The roll 2 is taken up on a roll changer 4, which enables an automatic roll change to be carried out.
  • the first printing unit 1 is a web 3 run through Fault detection device 5 upstream. This is as close as possible to the reel changer 4, arranged approximately in the area of the exit of the reel changer 4, so that between the passage of a web defect through the fault detection device and the entry of this defect into the first printing unit 1 as much time as possible stands to initiate appropriate measures. If a defect in web 3 is detected the cylinders of all printing units of the web-fed rotary printing press are Brought printing off, so that the faulty location of the web 3 without cylinder contact passes.
  • Detection units 6 are provided in the area of both web edges, which according to FIG in each case an observation device 7 and a deflection device assigned to it 8 included.
  • the deflection device 8 consists of two in the example shown arranged above or below the web 3, in the longitudinal direction of the web 3 offset organs. These are here to be acted upon with compressed air Blower nozzles designed to provide a non-contact deflection of a voltage-free Enable web area. The use of suction nozzles would also be conceivable.
  • the blowing nozzles forming the deflection device 8 are perpendicular to the Transport plane of the web 3 extending axis arranged. By in the longitudinal direction the web offset arrangement are overlapping web ends that have no fixed mutual connection, reliably stand out, is clearly shown in Figure 1. This creates a gap 9 through which the observation device 7 can look through.
  • the observation device 7 is designed as an optical sensor, which in each case consists of two elements arranged above or below the web 3 inform of the transmitter 7a and receiver 7b.
  • the optical axis a of the observation device 7 optical sensor is at least in the longitudinal direction of the web opposite the to the web plane essentially perpendicular to the direction through the deflection device 8 generated deflection force tilted, as Figure 1 clearly shows.
  • a tilt angle of 60 ° has proven to be useful in experiments.
  • a Tilt can be provided in the direction of the width of the web.
  • the optical axis a Provided when changing roles the new sheet is glued to the old sheet from the bottom is the optical axis a with its upper area against the running direction of the web tipped back and vice versa.
  • the arrangement tilted in the longitudinal direction of the web 3 of the sensor forming the observation device 7 ensures that the optical Axis a is a gap 9 opened by the deflection device 8 between one another can penetrate overlapping web ends, as Figure 1 clearly shows.
  • the optical axis a would run in a plane perpendicular to the orbital plane, the Gap 9 may not be penetrated due to overlap still present.
  • the optical sensors provided to form the observation device 7 are designed as fiber optic sensors, their transmitters or receivers are arranged at the end of a light guide 10 formed by a fiber bundle, as can be seen from Figure 3.
  • the elements of the observation device 7 are over its light guide 10, as shown in FIG. 2, is connected to a control device 11 which those for generating the emitted light and for processing the received Contains light required electrical and electronic equipment.
  • the Control device 11, a computer for processing the incoming signals has sufficient distance from the web 3 so that electrostatic discharges do not cause interference to the electrical and electronic elements can.
  • the fiber bundle forming the light guide 10 runs, as shown in FIG. 3, in a housing 12 having a slot 13 facing the web 3, which as Light exit slit or light entry slit acts.
  • the housing ends of the Optical fibers are inform a single or multi-line, the slot 13 assigned Row 14 arranged so that 13 emits light through the slot or can be received.
  • the chamber 15 delimited by the housing 12 is, as can be seen from FIG. 4, with provided with a compressed air connection 16 and pressurized with compressed air. This exits through the slot 13, being purge air at the ends of the row 14 forming optical fibers flow past and keep them clean. Resulting from this high functional reliability and maintenance-free operation.
  • the fiber rows 14 of the transmitter and receiver of the sensors are exactly on top of each other aligned.
  • the receiver is through the path 3 partially covered and therefore only receives part of that from the assigned transmitter emitted light.
  • the basic setting of the detection units 6 is such that in the area of the two web edges in each case 50% of the light is shadowed.
  • the sled 17 are useful mechanically adjustable, such as by a motor 18 and one driven therefrom indicated in engagement with the associated carriage 17 spindle drive 19 is.
  • the motors 18 can be controlled by means of the control device 11.
  • the positioning the detection units 6 take place when the printing press is already running, useful during the start-up phase. After positioning, the Evaluation of the sensor signals released. This can be done manually from Control panel 20 of the printing press can be initiated, such as through a signal line 21 is indicated. But also an automatic release after positioning is completed could be possible.
  • the commands formed by evaluating the sensor signals to initiate the processes already described above, such as "printing from” etc., are transferred from the control device 11 to the printing press control, as indicated by the signal line 22.
  • the control device 11 is also assigned a memory 23, by means of which the temporal signal curve logged and thus recorded in a traceable manner.
  • FIG. 5 shows the course of the intensity I of the sensors S1 or S2 generated signals over time t, the signal curves in three columns I, II, III of three selected cases are shown below each Signal curve are indicated.
  • Column I is based on a normal web run.
  • the sensors S1, S2 assigned to the two web edges remain here emitted signals within the set tolerance band 24.
  • the width of the tolerance band 24 is dependent on individual boundary conditions, e.g. machine-dependent, adjustable. Also different widths in the area both machine sides are conceivable in this context.
  • the column III of FIG. 5 is the case for one one-sided defect of the web 3. This can be an incomplete one Adhesion in the area of the joint between two successive webs or around a minor lateral crack etc., which can be attributed to transport damage etc. is act. In this case, only the signal of the person detecting the defect moves Sensor S1 out of the tolerance band 24, which also triggers of an order.
  • the error detection device 5 is continuous from the release until it is switched off active. Accordingly, the ones forming the observation devices 7 Sensors are permanently exposed to light and which form the deflection devices 8 Compressed air permanently applied to nozzles. The one exerted by the compressed air Of course, the pressure is at a level that none with normal train trains Deflection results.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Detektion von Bahndefekten zur Verhinderung von Druckwerksbeschädigungen bei einer Rollenrotationsdruckmaschine, die eine von einer Rolle, die auf einem Rollenwechsler aufgenommen ist, gespeiste Bahn bedruckt, bei der eine Fehlerdetektionseinrichtung vorgesehen ist, die im Bereich beider Bahnkanten jeweils eine Auslenkeinrichtung, mittels der eine bei störungsfreiem Betrieb vom Bahnzug überwindbare, quer zur Transportebene der Bahn wirkende Auslenkkraft erzeugbar ist, und jeweils eine Veränderungen feststellende Beobachtungseinrichtung aufweist, deren optische Achse gegenüber der zur Transportebene der Bahn im wesentlichen lotrechten Richtung der Auslenkkraft zumindest in Längsrichtung der Bahn gekippt ist, wobei die beiden Beobachtungseinrichtungen der Fehlerdetektionseinrichtung als faseroptische Sensoren ausgebildet sind.The invention relates to a device for the detection of Web defects to prevent damage to the printing unit in a web-fed rotary printing press that is one of a roll that fed on a reel changer, fed web printed, in which an error detection device is provided, which each have a deflection device in the area of both web edges, by means of one with trouble-free operation of the train surmountable, acting transversely to the transport level of the train Deflection force can be generated, and one change each Detecting observation device, the optical Axis essentially opposite to the transport plane of the train perpendicular direction of the deflection force at least in the longitudinal direction the web is tilted, the two observation devices the error detection device as fiber optic sensors are trained.

Eine derartige Vorrichtung ist aus der US-A 5 389 795 bekannt. Bei dieser bekannten Anordnung ist die Beobachtungseinrichtung praktisch als Lichtschranke ausgebildet, bei der ein zwischen Sender und Empfänger verlaufender, linienförmiger Lichtstrahl erzeugt wird. Dieser wird von einer nicht beschädigten Bahn unterbrochen und geht im Falle einer Bahnbeschädigung zwischen Sender und Empfänger durch. Die bekannte Anordnung ist daher in der Lage, ein Ja-Nein-Signal zu erzeugen. Bei der bekannten Anordnung sind die Sender und Empfänger der faseroptischen Sensoren in einem mit Druckluft beaufschlagbaren, mit einer kleinen, düsenförmigen Öffnung versehenen Gehäuse der jeweils zugeordneten Auslenkeinrichtung angeordnet.Such a device is known from US-A 5 389 795. at this known arrangement is the observation device practically designed as a light barrier, in which a between Transmitter and receiver, linear light beam is produced. This is from an undamaged track interrupted and intervenes in the event of a train damage Transmitter and receiver through. The known arrangement is therefore able to generate a yes-no signal. In the known arrangement are the transmitters and receivers of the fiber optic sensors in one that can be pressurized with compressed air, with a small nozzle-shaped opening provided the housing of each assigned deflection device arranged.

Die DE-A 36 40 101 zeigt eine Vorrichtung zur Verhinderung von Druckwerksbeschädigungen bei einer Rollenrotationsdruckmaschine mit einer Fehlerdetektionseinrichtung, die vor dem ersten Druckwerk angeordnet ist.DE-A 36 40 101 shows a device for preventing Damage to printing unit in a web-fed rotary printing press with an error detection device that before the first Printing unit is arranged.

Hiervon ausgehend ist es die Aufgabe der vorliegenden Erfindung, eine Vorrichtung gattungsgemäßer Art mit einfachen und kostengünstigen Mitteln so zu verbessern, dass mit ihrer Hilfe auf Fehler beim Rollenwechsel und/oder Transportbeschädigungen der Bahnkanten und dergleichen zurückzuführende Druckwerksbeschädigungen zuverlässig verhindert werden.Proceeding from this, it is the object of the present invention a device of the generic type with simple and to improve cost-effective means so that with their help Errors when changing roles and / or transport damage to the Damage to web edges and the like caused by printing unit damage can be reliably prevented.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Fehlerdetektionseinrichtung vor dem ersten Druckwerk der Rollenrotationsdruckmaschine angeordnet ist, dass die faseroptischen Sensoren der Fehlerdetektionseinrichtung jeweils ein von der Abschattung durch die Bahn abhängiges Signal ausgeben und dass die die Sender und Empfänger der faseroptischen Sensoren bildenden Lichtleiterfasern jeweils inform von länglichen Faserreihen in einem mit einem der Bahn zugewandten Schlitz versehenen, eigenen Gehäuse enden, das mit Druckluft beaufschlagbar ist, die als an den Enden der Faserreihen vorbeiströmende Spülluft über den Schlitz entweicht. This object is achieved in that the Fault detection device in front of the first printing unit Rotary printing press is arranged that the fiber-optic sensors of the error detection device Output a signal dependent on the shadowing caused by the web and that the the transmitter and receiver of the fiber optic Optical fiber fibers forming sensors each inform of elongated Rows of fibers in a slot facing one of the web provided, own housing, the end with compressed air is acted upon as at the ends of the fiber rows Flushing purge air escapes through the slot.

Mit diesen Maßnahmen werden die Nachteile des gattungsgemäßen Standes der Technik vollständig beseitigt. Die erfindungsgemäße Ausbildung der Elemente der faseroptischen Sensoren ergibt in vorteilhafter Weise ein breites Lichtband, das von der Bahn mehr oder weniger abgeschattet wird. Die Spülung der reihenförmig angeordneten Faserenden von Sender und Empfänger der faseroptischen Sensoren mit Druckluft, die mit der zur Auslenkung der Bahn verwendeten Druckluft nichts zu tun hat, ermöglicht eine zuverlässige Spülung und Reinhaltung der Faserenden, so dass die Breite des Lichtbands auch bei robusten Betriebsverhältnissen durch Verschmutzung etc. nicht beeinträchtigt werden kann. Aus dem Grad der Abschattung der breiten Lichtbänder durch die Bahn ist daher die Größe aller relevanten, seitlichen Bahndefekte und insbesondere auch der bisher sehr gefürchteten Klebefehler direkt betragsmäßig erfassbar. Die erfindungsgemäßen Maßnahmen bieten dementsprechend in vorteilhafter Weise die Gewähr dafür, dass nicht nur festgestellt wird, dass überhaupt ein Fehler vorliegt, sondern auch welcher Fehler, so dass in jedem Einzelfall die Einleitung geeigneter Abhilfemaßnahmen möglich ist. Da die erfindungsgemäßen Maßnahmen ein vom Grad der Abschattung abhängiges, also ein betragsabhängiges Signal erzeugen, kann in vorteilhafter Weise auch ein Toleranzband zugelassen werden, innerhalb dessen Schwankungen toleriert werden. Da die erfindungsgemäße Detektionseinrichtung bereits vor dem ersten Druckwerk angeordnet ist und Bahndefekte, die in der Regel im ersten Druckwelle zu Seitenwicklern führen könnten, betragsmäßig erkennt, lassen sich hierauf zurückzuführende Druckwerksbeschädigungen zuverlässig vermeiden. With these measures, the disadvantages of generic prior art completely eliminated. The Design of the elements of the fiber optic according to the invention Sensors advantageously results in a wide band of light that the web is more or less shadowed. The flushing of the fiber ends of transmitter and receiver arranged in rows the fiber optic sensors with compressed air, which with the for Deflection of the web used compressed air has nothing to do enables reliable flushing and keeping the Fiber ends so that the width of the light band even with robust Operating conditions due to pollution etc. not can be affected. From the degree of shadowing wide strips of light through the web is therefore the size of everyone relevant, lateral web defects and in particular also the Previously very feared glue errors can be recorded directly in terms of amount. The measures according to the invention accordingly offer in advantageously guarantee that not only found is that there is an error at all, but also which one Errors, so that the initiation is more appropriate in each individual case Remedial action is possible. Since the invention Measures depending on the degree of shadowing, i.e. a can generate an amount-dependent signal in an advantageous manner a tolerance band can also be permitted within which Fluctuations are tolerated. Since the detection device according to the invention even before the first Printing unit is arranged and web defects, which are usually in the amount of the first pressure wave could lead to side winders recognizes, can be traced back to this Avoid damage to the printing unit reliably.

Vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den Unteransprüchen angegeben.Advantageous refinements and practical training of overriding measures are in the subclaims specified.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher beschrieben.An embodiment of the invention is described below the drawing described in more detail.

In der Zeichnung zeigen:

Figur 1
eine schematische Ansicht einer Rollenrotationsdruckmaschine mit einer erfindungsgemäßen Vorrichtung,
Figur 2
eine schematische Ansicht der erfindungsgemäßen Vorrichtung mit quergeschnittener Bahn,
Figur 3
eine Draufsicht auf einen faseroptischen Sensor der erfindungsgemäßen Vorrichtung,
Figur 4
einen Schnitt entlang der Linie IV/IV in Figur 3 und
Figur 5
eine Übersicht über den zeitlichen Verlauf der Sensorsignale bei drei verschiedenen Fällen.
The drawing shows:
Figure 1
1 shows a schematic view of a web-fed rotary printing press with a device according to the invention,
Figure 2
2 shows a schematic view of the device according to the invention with a cross-sectional web,
Figure 3
a plan view of a fiber optic sensor of the device according to the invention,
Figure 4
a section along the line IV / IV in Figure 3 and
Figure 5
an overview of the time course of the sensor signals in three different cases.

Der Aufbau und die Wirkungsweise von Rollenrotationsdruckmaschinen sowie diesen vorgeordneten Rollenwechslern sind an sich bekannt und bedürfen daher im vorliegenden Zusammenhang keiner näheren Erläuterung mehr. Die Figur 1 zeigt ein erstes Druckwerk 1 einer Rollenrotationsdruckmaschine, der eine von einer Rolle 2 abgewickelte Bahn 3 zugeführt wird. Die Rolle 2 ist auf einem Rollenwechsler 4 aufgenommen, der die Durchführung eines automatischen Rollenwechsels ermöglicht.The structure and mode of operation of web-fed rotary printing presses as well as this parent Role changers are known per se and therefore require in no further explanation in the present context. The Figure 1 shows a first printing unit 1 Web-fed rotary printing press, one of which is unwound from a roll 2 Lane 3 is fed. The roll 2 is taken up on a roll changer 4, which enables an automatic roll change to be carried out.

Beim Rollenwechsel kann es vorkommen, daß die miteinander zu verbindenden Bahnenden mit seitlichem Versatz aneinander angeklebt werden, wie in Figur 5, Spalte II, unten angedeutet ist, oder daß die Klebung im Bereich der Bahnkanten nicht vollständig ist, wie in Figur 5, Spalte III, unten angedeutet ist. Fehler dieser Art und andere seitliche Defekte, wie Risse, ergeben jeweils ein spannungsloses seitliches Ohr. Dieses kann infolge der klebenden Wirkung der Druckfarbe an einem die Bahn 3 bedruckenden Zylinder des Druckwerks 1 haften bleiben und zu einem seitlichen Wickler führen. Diese Gefahr wird dadurch noch verstärkt, daß erfahrungsgemäß im Bereich des Druckbildbands ein Farbaufbau vorhanden ist.When changing rolls, it can happen that the web ends to be connected to each other are glued to one another with a lateral offset, as in FIG. 5, column II, is indicated below, or that the gluing in the area of the web edges is not complete is, as indicated in Figure 5, column III, below. Mistakes of this kind and others Lateral defects, such as cracks, each result in a tension-free lateral ear. This can due to the adhesive effect of the printing ink on a web 3 printing Cylinders of printing unit 1 stick and lead to a side winder. This danger is exacerbated by the fact that experience in the area of A color build-up is present in the printed image strip.

Um Wicklern oben genannter Art und den damit verbundenen Druckwerksbeschädigungen vorzubeugen, ist dem ersten Druckwerk 1 eine von der Bahn 3 durchlaufene Fehlerdetektionseinrichtung 5 vorgeordnet. Diese ist möglichst nahe am Rollenwechsler 4, etwa im Bereich des Ausgangs des Rollenwechslers 4, angeordnet, so daß zwischen dem Durchgang eines Bahndefekts durch die Fehlerdetektionseinrichtung und dem Einlauf dieses Defekts in das erste Druckwerk 1 möglichst viel Zeit zur Verfügung steht, um geeignete Maßnahmen einzuleiten. Wenn ein Defekt der Bahn 3 detektiert wird, werden die Zylinder aller Druckwerke der Rollenrotationsdruckmaschine in Druckabstellung gebracht, so daß die fehlerhafte Stelle der Bahn 3 ohne Zylinderkontakt durchläuft. Sofern im Bereich eines der Rollenrotationsdruckmaschine in der Regel nachgeordneten Falzapparats eine Makulaturweiche vorgesehen ist, wird diese so geöffnet, daß der den Defekt enthaltende Bahnbereich ausgesondert wird. Sofern die Rollenrotationsdruckmaschine für das sogenannte Fortdruckwaschen eingerichtet ist, bei dem die Waschflüssigkeit und die von dieser gelöste Farbe durch die Bahn abtransportiert werden, wird die Durchführung eines derartigen Waschvorgangs während eines Fehlerdurchlaufs verhindert. Sofern eine Bahnfangvorrichtung vorgesehen ist, die in der Regel zwischen dem letzten Druckwerk und dem nachgeordneten Trockner angeordnet ist, und sofern der zur Aktivierung der Fangvorrichtung vorgesehene Bahnreißschalter so ausgebildet ist, daß er beim Durchgang eines Bahndefekts oben erwähnter Art ansprechen würde, wird auch dieses Ansprechen unterdrückt. Zur Bildung der Fehlerdetektionseinrichtung 5 sind, wie aus Figur 2 entnehmbar ist, im Bereich beider Bahnkanten Detektionseinheiten 6 vorgesehen, die gemäß Figur 2 jeweils eine Beobachtungseinrichtung 7 und eine dieser zugeordnete Auslenkeinrichtung 8 enthalten. Die Auslenkeinrichtung 8 besteht im dargestellten Beispiel aus zwei oberhalb bzw. unterhalb der Bahn 3 angeordneten, in Längsrichtung der Bahn 3 gegeneinander versetzten Auslenkorganen. Diese sind hier als mit Druckluft beaufschlagbare Blasdüsen ausgebildet, die eine berührungslose Auslenkung eines spannungslosen Bahnbereichs ermöglichen. Auch die Verwendung von Saugdüsen wäre denkbar. Die die Auslenkeinrichtung 8 bildenden Blasdüsen sind mit senkrecht zur Transportebene der Bahn 3 verlaufender Achse angeordnet. Durch die in Längsrichtung der Bahn versetzte Anordnung werden einander überlappende Bahnenden, die keine feste gegenseitige Verbindung haben, zuverlässig voneinander abgehoben, wie in Figur 1 anschaulich dargestellt ist. Auf diese Weise entsteht ein Spalt 9, durch den die Beobachtungseinrichtung 7 hindurchblicken kann.About winders of the type mentioned above and the damage to the printing unit associated with them to prevent, the first printing unit 1 is a web 3 run through Fault detection device 5 upstream. This is as close as possible to the reel changer 4, arranged approximately in the area of the exit of the reel changer 4, so that between the passage of a web defect through the fault detection device and the entry of this defect into the first printing unit 1 as much time as possible stands to initiate appropriate measures. If a defect in web 3 is detected the cylinders of all printing units of the web-fed rotary printing press are Brought printing off, so that the faulty location of the web 3 without cylinder contact passes. If in the area of one of the web-fed rotary printing press in the As a rule, a waste gate is provided for the downstream folder, this will be opened so that the web area containing the defect is discarded. Provided set up the web-fed rotary printing press for so-called continuous printing washing is where the washing liquid and the paint detached from it through the web are carried away, the implementation of such a washing process prevented during an error run. If a web safety device is provided which is usually between the last printing unit and the subordinate one Dryer is arranged, and provided that the activation of the safety gear Web break switch is designed so that it passes through a web defect would address the above mentioned type, this response is also suppressed. To form the error detection device 5, as can be seen from FIG. 2, Detection units 6 are provided in the area of both web edges, which according to FIG in each case an observation device 7 and a deflection device assigned to it 8 included. The deflection device 8 consists of two in the example shown arranged above or below the web 3, in the longitudinal direction of the web 3 offset organs. These are here to be acted upon with compressed air Blower nozzles designed to provide a non-contact deflection of a voltage-free Enable web area. The use of suction nozzles would also be conceivable. The blowing nozzles forming the deflection device 8 are perpendicular to the Transport plane of the web 3 extending axis arranged. By in the longitudinal direction the web offset arrangement are overlapping web ends that have no fixed mutual connection, reliably stand out, is clearly shown in Figure 1. This creates a gap 9 through which the observation device 7 can look through.

Die Beobachtungseinrichtung 7 ist als optischer Sensor ausgebildet, der jeweils aus zwei oberhalb bzw. unterhalb der Bahn 3 angeordneten Elementen inform von Sender 7a und Empfänger 7b besteht. Die optische Achse a des die Beobachtungseinrichtung 7 bildenden optischen Sensors ist zumindest in Längsrichtung der Bahn gegenüber der zur Bahnebene im wesentlichen lotrechten Richtung der durch die Auslenkeinrichtung 8 erzeugten Auslenkkraft gekippt, wie Figur 1 anschaulich zeigt. Ein Kippwinkel von 60° hat sich bei Versuchen als zweckmäßig erwiesen. Zusätzlich kann auch eine Kippung in Richtung der Breite der Bahn vorgesehen sein. Sofern beim Rollenwechsel die neue Bahn mit ihrem Anfang von unten an die alte Bahn angeklebt wird, ist die optische Achse a mit ihrem oberen Bereich entgegen der Laufrichtung der Bahn zurückgekippt und umgekehrt. Die in Längsrichtung der Bahn 3 gekippte Anordnung des die Beobachtungeinrichtung 7 bildenden Sensors stellt sicher, daß die optische Achse a einen durch die Auslenkeinrichtung 8 geöffneten Spalt 9 zwischen einander überlappenden Bahnenden durchdringen kann, wie Figur 1 anschaulich zeigt. Sofern die optische Achse a in einer zur Bahnebene lotrechten Ebene verliefe, würde der Spalt 9 infolge noch vorhandener Überdeckung unter Umständen nicht durchdrungen. The observation device 7 is designed as an optical sensor, which in each case consists of two elements arranged above or below the web 3 inform of the transmitter 7a and receiver 7b. The optical axis a of the observation device 7 optical sensor is at least in the longitudinal direction of the web opposite the to the web plane essentially perpendicular to the direction through the deflection device 8 generated deflection force tilted, as Figure 1 clearly shows. A tilt angle of 60 ° has proven to be useful in experiments. In addition, a Tilt can be provided in the direction of the width of the web. Provided when changing roles the new sheet is glued to the old sheet from the bottom is the optical axis a with its upper area against the running direction of the web tipped back and vice versa. The arrangement tilted in the longitudinal direction of the web 3 of the sensor forming the observation device 7 ensures that the optical Axis a is a gap 9 opened by the deflection device 8 between one another can penetrate overlapping web ends, as Figure 1 clearly shows. Provided the optical axis a would run in a plane perpendicular to the orbital plane, the Gap 9 may not be penetrated due to overlap still present.

Die zur Bildung der Beobachtungseinrichtung 7 vorgesehenen optischen Sensoren sind als faseroptische Sensoren ausgebildet, deren Sender bzw. Empfänger am Ende eines durch ein Faserbündel gebildeten Lichtleiters 10 angeordnet sind, wie aus Figur 3 erkennbar ist. Die Elemente der Beobachtungseinrichtung 7 sind über ihre Lichtleiter 10, wie Figur 2 zeigt, mit einer Steuereinrichtung 11 verbunden, welche die zur Erzeugung des ausgesendeten Lichts und zur Verarbeitung des empfangenen Lichts benötigten elektrischen und elektronischen Einrichtungen enthält. Die Steuereinrichtung 11, die einen Rechner zur Verarbeitung der ankommenden Signale aufweist, hat ausreichend Abstand von der Bahn 3, so daß elektrostatische Entladungen keine Störungen der elektrischen und elektronischen Elemente bewirken können. Das den Lichtleiter 10 bildende Faserbündel läuft, wie Figur 3 weiter zeigt, in ein Gehäuse 12 ein, das einen der Bahn 3 zugewandten Schlitz 13 aufweist, der als Lichtaustrittsschlitz bzw. Lichteintrittsschlitz fungiert. Die gehäuseseitigen Enden der Lichtleiterfasern sind dabei inform einer ein- oder mehrzeiligen, dem Schlitz 13 zugeordneten Reihe 14 angeordnet, so daß über den Schlitz 13 Licht ausgesendet bzw. empfangen werden kann.The optical sensors provided to form the observation device 7 are designed as fiber optic sensors, their transmitters or receivers are arranged at the end of a light guide 10 formed by a fiber bundle, as can be seen from Figure 3. The elements of the observation device 7 are over its light guide 10, as shown in FIG. 2, is connected to a control device 11 which those for generating the emitted light and for processing the received Contains light required electrical and electronic equipment. The Control device 11, a computer for processing the incoming signals has sufficient distance from the web 3 so that electrostatic discharges do not cause interference to the electrical and electronic elements can. The fiber bundle forming the light guide 10 runs, as shown in FIG. 3, in a housing 12 having a slot 13 facing the web 3, which as Light exit slit or light entry slit acts. The housing ends of the Optical fibers are inform a single or multi-line, the slot 13 assigned Row 14 arranged so that 13 emits light through the slot or can be received.

Die vom Gehäuse 12 begrenzte Kammer 15 ist, wie aus Figur 4 erkennbar ist, mit einem Druckluftanschluß 16 versehen und hierüber mit Druckluft beaufschlagbar. Diese tritt über den Schlitz 13 aus, wobei sie als Spülluft an den Enden der die Reihe 14 bildenden Lichtleiterfasern vorbeiströmt und diese sauber hält. Hierdurch ergeben sich eine hohe Funktionssicherheit sowie ein wartungsfreier Betrieb.The chamber 15 delimited by the housing 12 is, as can be seen from FIG. 4, with provided with a compressed air connection 16 and pressurized with compressed air. This exits through the slot 13, being purge air at the ends of the row 14 forming optical fibers flow past and keep them clean. Resulting from this high functional reliability and maintenance-free operation.

Die Faserreihen 14 von Sender und Empfänger der Sensoren sind exakt aufeinander ausgerichtet. Der Empfänger ist dabei, wie aus Figur 2 erkennbar ist, durch die Bahn 3 teilweise abgedeckt und empfängt daher nur einen Teil des vom zugeordneten Sender ausgesandten Lichts. Je mehr die Bahn 3 abdeckt ist, um so weniger Licht kommt durch. Die Verarbeitung des durchkommenden Lichts ergibt dementsprechend ein mit der durch die Bahn bewirkten Abschattung korrespondierendes Signal. Die Grundeinstellung der Detektionseinheiten 6 ist so, daß im Bereich der beiden Bahnkanten jeweils 50 % des Lichts abgeschattet wird.The fiber rows 14 of the transmitter and receiver of the sensors are exactly on top of each other aligned. As can be seen from FIG. 2, the receiver is through the path 3 partially covered and therefore only receives part of that from the assigned transmitter emitted light. The more the web 3 is covered, the less light comes by. The processing of the light coming through accordingly results in a the corresponding shadowing caused by the web. The basic setting of the detection units 6 is such that in the area of the two web edges in each case 50% of the light is shadowed.

Zur Erleichterung der seitlichen Einstellung der jeweils eine Beobachtungseinrichtung 7 und die dieser zugeordnete Auslenkeinrichtung 8 enthaltenden Detektionseinheiten 6 sind diese, wie aus Figur 2 entnehmbar ist, auf einem jeweils zugeordneten, seitlich verfahrbar angeordneten Schlitten 17 aufgenommen. Die Schlitten 17 sind zweckmäßig maschinell verstellbar, wie durch einen Motor 18 und einen hiervon angetriebenen im Eingriff mit dem zugeordneten Schlitten 17 stehenden Spindeltrieb 19 angedeutet ist. Die Motoren 18 sind mittels der Steuereinrichtung 11 steuerbar. Die Positionierung der Detektionseinheiten 6 erfolgt bei bereits laufender Druckmaschine, zweckmäßig während der Anlaufphase. Nach erfolgter Positionierung wird die Auswertung der Sensorsignale freigegeben. Dieser Vorgang kann manuell vom Steuerpult 20 der Druckmaschine aus eingeleitet werden, wie durch eine Signalleitung 21 angedeutet ist. Aber auch eine automatische Freigabe nach Beendigung der Positionierung wäre möglich. Die durch Auswertung der Sensorsignale gebildeten Befehle zur Einleitung der weiter oben bereits geschilderten Vorgänge, wie "Druck ab" etc., werden von der Steuereinrichtung 11 an die Druckmaschinensteuerung übergeben, wie durch die Signalleitung 22 angedeutet ist. Im dargestellten Beispiel ist der Steuereinrichtung 11 noch ein Speicher 23 zugeordnet, mittels dessen der zeitliche Signalverlauf protokolliert und damit nachvollziehbar festgehalten wird.To facilitate the lateral adjustment of each observation device 7 and the detection units containing this associated deflection device 8 6, as can be seen from FIG. 2, these are on an associated side movably arranged carriage 17 added. The sled 17 are useful mechanically adjustable, such as by a motor 18 and one driven therefrom indicated in engagement with the associated carriage 17 spindle drive 19 is. The motors 18 can be controlled by means of the control device 11. The positioning the detection units 6 take place when the printing press is already running, useful during the start-up phase. After positioning, the Evaluation of the sensor signals released. This can be done manually from Control panel 20 of the printing press can be initiated, such as through a signal line 21 is indicated. But also an automatic release after positioning is completed could be possible. The commands formed by evaluating the sensor signals to initiate the processes already described above, such as "printing from" etc., are transferred from the control device 11 to the printing press control, as indicated by the signal line 22. In the example shown is the control device 11 is also assigned a memory 23, by means of which the temporal signal curve logged and thus recorded in a traceable manner.

Die bei normalem Bahnlauf zu erwartende, seitliche Verschiebung der Bahn 3 wird der Steuereinrichtung 11 als Toleranzband vorgegeben, wie in Figur 5 bei 24 angedeutet ist. Die Figur 5 zeigt den Verlauf der Intensität I der von den Sensoren S1 bzw. S2 erzeugten Signale über der Zeit t, wobei in drei Spalten I,II,III die Signalverläufe von drei ausgewählten Fällen dargestellt sind, die unterhalb des jeweiligen Signalverlaufs angedeutet sind. Der Spalte I liegt ein normaler Bahnlauf zugrunde. Hierbei bleiben die von den den beiden Bahnkanten zugeordneten Sensoren S1, S2 abgegebenen Signale innerhalb des eingestellten Toleranzbands 24.The lateral displacement of the web 3 to be expected in the normal web run becomes the control device 11 as a tolerance band, as indicated at 24 in FIG is. FIG. 5 shows the course of the intensity I of the sensors S1 or S2 generated signals over time t, the signal curves in three columns I, II, III of three selected cases are shown below each Signal curve are indicated. Column I is based on a normal web run. The sensors S1, S2 assigned to the two web edges remain here emitted signals within the set tolerance band 24.

Die Breite des Toleranzbands 24 ist in Abhängigkeit von individuellen Randbedingungen, z.B. maschinenabhängig, einstellbar. Auch unterschiedliche Breiten im Bereich beider Maschinenseiten sind in diesem Zusammenhang denkbar.The width of the tolerance band 24 is dependent on individual boundary conditions, e.g. machine-dependent, adjustable. Also different widths in the area both machine sides are conceivable in this context.

Sofern die Randkanten aneinander angeschlossener Bahnen 3a,b seitlich gegeneinander versetzt sind, wie in Spalte II von Figur 5 unten angedeutet ist, treten die Signale der Sensoren S1,S2 sprunghaft in entgegengesetzten Richtungen aus dem Toleranzband 24 heraus, wie in Spalte II von Figur 5 oben gezeigt ist. Dies führt zur Auslösung eines entsprechenden Befehls. Der Spalte III der Figur 5 liegt der Fall eines einseitigen Defekts der Bahn 3 zugrunde. Dabei kann es sich um eine unvollständige Klebung im Bereich der Stoßstelle zwischen zwei einander folgenden Bahnen oder um einen kleineren seitlichen Riß etc., der auf eine Transportbeschädigung etc. zurückzuführen ist, handeln. In diesem Fall wandert nur das Signal des den Defekt erfassenden Sensors S1 aus dem Toleranzband 24 heraus, was ebenfalls zur Auslösung eines Befehls führt.If the edges of interconnected tracks 3a, b laterally against each other are offset, as indicated in column II of Figure 5 below, the signals occur the sensors S1, S2 jump in opposite directions from the tolerance band 24, as shown in column II of Figure 5 above. This leads to triggering an appropriate command. The column III of FIG. 5 is the case for one one-sided defect of the web 3. This can be an incomplete one Adhesion in the area of the joint between two successive webs or around a minor lateral crack etc., which can be attributed to transport damage etc. is act. In this case, only the signal of the person detecting the defect moves Sensor S1 out of the tolerance band 24, which also triggers of an order.

Die Fehlerdetektionseinrichtung 5 ist ab der Freigabe ununterbrochen bis zur Abschaltung aktiv. Dementsprechend werden die die Beobachtungseinrichtungen 7 bildenden Sensoren permanent mit Licht beaufschlagt und die die Auslenkeinrichtungen 8 bildenden Düsen permanent mit Druckluft beaufschlagt. Der von der Druckluft ausgeübte Druck liegt selbstverständlich auf einem Niveau, das bei normalem Bahnzug keine Auslenkung ergibt.The error detection device 5 is continuous from the release until it is switched off active. Accordingly, the ones forming the observation devices 7 Sensors are permanently exposed to light and which form the deflection devices 8 Compressed air permanently applied to nozzles. The one exerted by the compressed air Of course, the pressure is at a level that none with normal train trains Deflection results.

Claims (10)

  1. Device to detect faults of the web to prevent damage to printing groups of web-fed rotary presses that print webs (3) fed by a cylinder (2) which is placed on a reel changer, whereby a fault detector is (5) provided that has a deflection device next to both web edges that can create a deflective force transverse to the plane of web (3) transport which can be overcome by the tension of the web during normal operation, and a monitor (7) is provided that detects changes and whose optical axis (a) is tilted in the lengthwise direction of the web (3) in relation to the direction of the deflection force that is essentially perpendicular to the transport plane of the web (3), whereby the monitors (7) are designed as fiberoptic sensors (S1, S2) characterised in that the fault detection device (5) is located before the first printing group (1) of the web-fed rotary press,that each of the fiberoptic sensors (S1, S2) of the fault detection device (5) emits a signal (I) which depends on its interruption by the web (3), and that the light guide fibers forming the transmitters and receivers of the fiberoptic sensors (S1, S2) end in the form of elongated fiber rows (14) in an own housing (12) that has a slot (13) facing the web (3) and that can be supplied with compressed air which exits via slot (13) and serves as cleaning air passing by the ends of the fiber rows (14) and each of the two monitors (7) of the fault detector (5) is designed as an optical sensor.
  2. A device according to claim 1, characterized in that the fault detector (5) is close to the reel changer (4) and preferably at the outlet of the reel changer (4).
  3. A device according to one of the proceding claims, characterized in that the deflection device. (8) has at least two deflecting elements on different sides of the web (3) that are offset from each other in the lengthwise direction of the web (3) whereby the deflecting elements are designed preferably as air nozzles that can be provided with compressed air.
  4. A device according to one of the proceding claims, characterized in that the signal emitted by the monitor (7) is an analog signal.
  5. A device according to one of the proceding claims, characterized in that the elements of the monitors (7) are connected to a controller (11)by a fiber bundle (10) and that the controller (11) has a computer to process the arriving signals.
  6. A device according to one of the proceding claims, characterized in that the angle of tilt of the optical axis (a) of the monitor (7) is 60°.
  7. A device according to one of the proceding claims, characterized in that the transmission and receiving elemnts of the monitors (7) are set so that in the case of undisturbed running of the web (3) a part of the light emitted by the transmittor, preferably 50% of this light, is shaded.
  8. A device according to one of the proceding claims, characterized in that the monitors (7) form a detection unit (6) with the assigned deflection device (8), whereby the detection units (6) preferably are supposed on laterally-adjustable slides (17) that are preferably motor-driven and controlled by the controller (11).
  9. A device according to one of the proceding claims, characterized in that a control command generated by at least one sensor signal (I) is sent to the printer from the controller (11) when a preferably settable tolerance range (24) has been exceeded; the signal puts the printing groups in "stop printing" position at the time the fault passes through, and/or a waste paper shunt is activated and/or a continuous washing system is suppressed, and/or the activation of a web catching device is suppressed.
  10. A device according to one of the proceding claims, characterized in that the defects detected by the fault detector (5) are preferably recordable by a memory (23) assigned to the controller (11).
EP98113629A 1997-08-07 1998-07-22 Device for preventing damages of a printing unit Expired - Lifetime EP0895860B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19734137A DE19734137C2 (en) 1997-08-07 1997-08-07 Device for preventing printing unit damage
DE19734137 1997-08-07

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EP0895860A2 EP0895860A2 (en) 1999-02-10
EP0895860A3 EP0895860A3 (en) 1999-06-16
EP0895860B1 true EP0895860B1 (en) 2002-10-23

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EP (1) EP0895860B1 (en)
JP (1) JPH11115161A (en)
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DE (2) DE19734137C2 (en)

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EP1760019A2 (en) 2005-09-03 2007-03-07 Baldwin Germany GmbH Monitoring system for web breaks in a rotary printing press

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DE102004017676A1 (en) * 2004-04-10 2005-11-03 Baldwin Germany Gmbh Error detecting device for roll rotation printing machine, has evaluation unit processing actual positions of edge detectors at edges based on comparative algorithm, and outputting warn signal if processing result fulfills error criteria
DE102004017676B4 (en) * 2004-04-10 2008-09-11 Baldwin Germany Gmbh Error detection device of a web-fed rotary printing press
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DE102005041919B4 (en) * 2005-09-03 2008-05-29 Baldwin Germany Gmbh Web break monitoring device for web-fed rotary presses

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DE59806021D1 (en) 2002-11-28
DE19734137A1 (en) 1999-02-18
CN1089688C (en) 2002-08-28
DE19734137C2 (en) 2001-07-12
EP0895860A2 (en) 1999-02-10
EP0895860A3 (en) 1999-06-16
US5947024A (en) 1999-09-07
CN1210072A (en) 1999-03-10
JPH11115161A (en) 1999-04-27

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