EP0533043B1 - Arrangement for photoelectrically monitoring the movement of webs or sheets, in particular paper webs in rotary printing machines - Google Patents

Arrangement for photoelectrically monitoring the movement of webs or sheets, in particular paper webs in rotary printing machines Download PDF

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Publication number
EP0533043B1
EP0533043B1 EP92115396A EP92115396A EP0533043B1 EP 0533043 B1 EP0533043 B1 EP 0533043B1 EP 92115396 A EP92115396 A EP 92115396A EP 92115396 A EP92115396 A EP 92115396A EP 0533043 B1 EP0533043 B1 EP 0533043B1
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EP
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Prior art keywords
paper web
webs
arrangement according
sensor chip
ccd sensor
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EP92115396A
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German (de)
French (fr)
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EP0533043A1 (en
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Bruno Erhardt
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Manroland AG
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MAN Roland Druckmaschinen AG
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    • 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

Definitions

  • the invention relates to an arrangement for photoelectrical monitoring of the movement of webs or sheets, in particular paper webs in rotary printing presses with a light source and a scanning device comprising a light-sensitive receiver and an evaluation and control unit from which subsequent operations of the printing press can be derived.
  • Frequently used arrangements for the monitoring of running webs include diffuse sensors, ultrasonic sensors or video camera systems.
  • a photoelectric monitoring device in which cracks on the paper are detected by means of diffuse sensors, further processed by an evaluation device and signaled to derive subsequent operations of the printing press.
  • Diffuse sensors have the advantage of detecting height movements of the running web, but do not have the necessary resolution to detect even narrow web tears that are less than 10 mm in size. This also applies to ultrasonic sensors. In any case, it is therefore only possible to a limited extent to recognize total breaks announced in advance by small web breaks. Another disadvantage is the fact that such an arrangement is only very uncomfortably adaptable to product-dependent changes in web width.
  • the object of the present invention to provide a generic arrangement for the photoelectric monitoring of running webs or sheets, which is designed to save space in the area of the monitoring point and can also be arranged in the narrowest spaces and has sufficient resolution to also include web tears or holes that are less than 10 mm in size, so that errors can be displayed within a very short time and countermeasures can be taken to prevent damage to the machine.
  • a scanner is proposed according to the invention in an arrangement of the type mentioned, which has a glass fiber optic in which individual optical waveguides are arranged on the one hand transversely to the running paper web in an optical waveguide row which is wider than the paper web and on the other hand the optical waveguides in one Cross-sectional converters are bundled in such a way that a CCD sensor chip integrated in the scanning device can be illuminated in terms of picture elements.
  • the CCD sensor chip is connected to the image evaluation and control unit.
  • the light source is arranged opposite the glass fiber optics in the manner transverse to the running paper web, so that it is wider than the paper web, the paper web runs between the light source and the glass fiber optics, and thus the paper web can be projected onto the optical waveguide line.
  • Fig. 1 denotes the paper web running perpendicular to the plane of the drawing.
  • a scanning device 2 is arranged above the paper web 1 and has a glass fiber optic 3.
  • the individual optical fibers 4 of the glass fiber optics 3 are combined on the one hand transversely to the running paper web 1 in an optical fiber line 5 which is wider than the paper web 1 and thus has optical fibers 4 in the manner shown, which look left and right over the edges of the paper web 1 .
  • the optical fibers 4 are bundled in a cross-sectional converter 6 and illuminate a CCD sensor chip 7 integrated in the scanning device 2.
  • the optical fibers 4 are embedded in synthetic resin and the end face facing the paper web 1 is polished. This simplifies the cleaning of the optical fiber line 5 during operation of the printing press.
  • the cross-sectional converter 6 has the function of converting the positions 8 (1-N) of the optical waveguides 4 on the optical waveguide row 5 into a cross-section which corresponds to the area of the CCD sensor chip 7.
  • the CCD sensor chip 7 can be a line element, but also a surface element.
  • the CCD sensor chip 7 is connected in a manner known per se to the image evaluation and control unit 9, from which security systems of the printing press, e.g. a paper catch device 10 (FIG. 3) can be controlled.
  • security systems of the printing press e.g. a paper catch device 10 (FIG. 3) can be controlled.
  • a rod-shaped light source 12 is arranged transversely to this and parallel to the optical waveguide row 5.
  • the light source 12 has the same width as the optical waveguide row 5, so that the optical waveguides 4 protruding from the paper web 1 can be illuminated.
  • the optical waveguide row 5 is projected onto the optical waveguide row 5, ie in the case of an intact paper web only the optical waveguides 4 projecting beyond the edges of the paper web 1 are illuminated.
  • the number of non-illuminated optical waveguides 4 is a measure of whether the paper web is free of defects or has web tears or holes.
  • the distance between the glass fiber optics (3), ie the optical fiber line 5 to the paper web 1, is set so that a line resolution between 1 and 5 mm can be achieved.
  • the image evaluation and control unit 9 essentially comprises an image recording part and a microprocessor for image processing.
  • the assignment of the optical fiber positions 8 (1-N) to the pixels (1-M) of the CCD sensor chip 7 is made.
  • very special advantage of the measures according to the invention can be seen in the fact that complex optics and the resulting adjustment in the machine can be dispensed with in both cases.
  • the image evaluation and control unit 9 also has outputs 15, such as parallel outputs for the direct control of protective devices, such as e.g. a paper catch device 10 (FIG. 3) or a freely programmable controller or serial outputs for coupling to an existing system.
  • protective devices such as e.g. a paper catch device 10 (FIG. 3) or a freely programmable controller or serial outputs for coupling to an existing system.
  • Fig. 2 shows the arrangement according to the invention in its basic mechanical structure.
  • the light source 12, the fiber optic line 5, the cross-sectional converter 6 and a unit 14 with the CCD sensor chip 6 and the image evaluation and control unit 9 is installed in a space-saving manner, so that the arrangement can be hung anywhere on the printing press and the paper web 1 can be carried out between the light source 12 and the optical waveguide row 5 in the manner shown.
  • Diffuse sensors 11 can also be integrated in the frame 13.
  • the connection to the external control is made via the line 15. Since the adjustment of an optical system is not necessary, it is possible in a simple manner to fold away or even unhook the entire unit 5, 6, 11, 15 for maintenance work.
  • FIG. 3 shows an application example of an arrangement according to the invention.
  • an arrangement 23 according to the invention for monitoring the running of the paper web 1 is located at a short distance behind the cylinders 21, 22 of the printing unit 18 in the running direction of the paper web 1 the side walls of the printing unit 18 mounted.
  • the paper web 1 breaks in the dryer 19.

Description

Die Erfindung betrifft eine Anordnung zur lichtelektrischen Überwachung des Laufes von Bahnen oder Bogen, insbesondere Papierbahnen in Rotationsdruckmaschinen mit einer Lichtquelle und einem lichtempflindlichen Empfänger umfassende Abtasteinrichtung und einer Auswerte- und Steuereinheit, von der Folgeoperationen der Druckmaschine ableitbar sind.The invention relates to an arrangement for photoelectrical monitoring of the movement of webs or sheets, in particular paper webs in rotary printing presses with a light source and a scanning device comprising a light-sensitive receiver and an evaluation and control unit from which subsequent operations of the printing press can be derived.

Bei laufenden Bahnen, wie z.B. Papierbahnen beim Druckprozeß, ist es insbesondere im zuge der ständig höher gewordenen Bahngeschwindigkeiten, notwendig geworden, Fehler auf der Bahn wie Totalabrisse, schmale Abrisse am Rand oder in der Bahn oder Löcher über einer bestimmten Größe so früh wie möglich zu erkennen, um geeignete Maßnahmen einzuleiten, die Maschinenschäden verhindern.With running webs, e.g. Paper webs in the printing process, in particular in the course of the ever increasing web speeds, have become necessary to recognize defects on the web such as total breaks, narrow breaks at the edge or in the web or holes over a certain size as early as possible in order to take suitable measures that prevent machine damage.

Bekanntlich können Bahnrisse in Rotationsdruckmaschinen, falls die Maschine nicht schnell genug stillgesetzt wird, zu schweren Beschädigungen der Druckwerke aufgrund von sogenannten Wicklern führen, die nicht nur zu längeren Betriebsunterbrechungen zwingen, sondern auch erhebliche Kosten verursachen.As is well known, web breaks in rotary printing presses, if the machine is not shut down quickly enough, can lead to serious damage to the printing units due to what are known as winders, which not only force longer interruptions in operation, but also cause considerable costs.

Häufig verwendete Anordnungen zur Überwachung von laufenden Bahnen beinhalten Reflexlichttaster, Ultraschallsensoren oder Videokamerasysteme.Frequently used arrangements for the monitoring of running webs include diffuse sensors, ultrasonic sensors or video camera systems.

Videokamerasysteme haben jedoch Probleme mit der Höhenbewegung der laufenden Bahn, da diese scheinbare Bahnbreitenschwankungen signalisiert. Aus diesem Grunde muß die Videokamera auf großen Abstand zur Papierbahn montiert werden. Dies hat einen vergleichsweise großen Raumbedarf zur Folge und verhindert zudem, daß der Fehler möglichst nahe am Ort der Entstehung erkannt wird. Dadurch treten Verzögerungszeiten auf, die keine befriedigende Ansprechgeschwindigkeiten von effizienten Sicherungssystemen, wie z.B. eine Papierfangvorrichtung oder eine Abschaltung der Maschine, gewährleisten.However, video camera systems have problems with the vertical movement of the running web, since this signals apparent web width fluctuations. For this reason, the video camera must be mounted at a large distance from the paper web. This results in a comparatively large space requirement and also prevents the error from being recognized as close as possible to the point of origin. This results in delay times that do not guarantee satisfactory response speeds from efficient security systems, such as a paper catcher or a shutdown of the machine.

Aus der DE-PS 33 05 606 ist beispielsweise eine lichtelektrische Überwachungseinrichtung bekannt geworden, bei der mittels Reflexlichttaster Risse auf dem Papier festgestellt, von einer Auswerteeinrichtung weiterverarbeitet und zur Ableitung von Folgeoperationen der Druckmaschine signalisiert werden. Reflexlichttaster haben den Vorteil Höhenbewegungen der laufenden Bahn zu erkennen, weisen jedoch nicht die notwendige Auflösung auf, um auch schmale Bahneinrisse, die kleiner als 10 mm in der Ausdehnung sind, zu erkennen. Dies gilt auch für Ultraschallsensoren. Es ist somit jedenfalls nur bedingt möglich, durch kleine Bahnrisse angekündigte Totalabrisse rechtzeitig zu erkennen. Ein weiterer Nachteil ist darin zu sehen, daß eine derartige Anordnung auf produktabhängige Bahnbreitenänderungen nur sehr unbequem anzupassen ist.From DE-PS 33 05 606, for example, a photoelectric monitoring device has become known, in which cracks on the paper are detected by means of diffuse sensors, further processed by an evaluation device and signaled to derive subsequent operations of the printing press. Diffuse sensors have the advantage of detecting height movements of the running web, but do not have the necessary resolution to detect even narrow web tears that are less than 10 mm in size. This also applies to ultrasonic sensors. In any case, it is therefore only possible to a limited extent to recognize total breaks announced in advance by small web breaks. Another disadvantage is the fact that such an arrangement is only very uncomfortably adaptable to product-dependent changes in web width.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, eine gattungsgemäße Anordnung zur lichtelektrischen Überwachung von laufenden Bahnen oder Bogen zu schaffen, die im Bereich der Überwachungsstelle platzsparend ausgebildet ist und auch in engsten Räumen angeordnet werden kann und über eine ausreichende Auflösung verfügt um auch Bahneinrisse bzw. Löcher, die in ihrer Ausdehnung kleiner als 10 mm sind, zu erkennen, so daß innerhalb kürzester Zeit Fehler angezeigt und Gegenmaßnahmen zum Verhindern von Schäden an der Maschine getroffen werden können.Proceeding from this, it is therefore the object of the present invention to provide a generic arrangement for the photoelectric monitoring of running webs or sheets, which is designed to save space in the area of the monitoring point and can also be arranged in the narrowest spaces and has sufficient resolution to also include web tears or holes that are less than 10 mm in size, so that errors can be displayed within a very short time and countermeasures can be taken to prevent damage to the machine.

Zur Lösung dieser Aufgabe wird erfindungsgemäß bei einer Anordnung der genannten Art eine Abtasteinrichtung vorgeschlagen, die eine Glasfaseroptik aufweist, bei der einzelne Lichtwellenleiter einerseits quer zur laufenden Papierbahn in einer Lichtwellenleiter-Zeile angeordnet sind, die breiter als die Papierbahn ist und andererseits die Lichtwellenleiter in einem Querschnittswandler in der Weise gebündelt sind, so daß ein in die Abtasteinrichtung integrierter CCD-Sensor-Chip bildelementmäßig ausleuchtbar ist. Der CCD-Sensor-Chip ist mit der Bildauswerte- und Steuereinheit verbunden. Die Lichtquelle ist gegenüber der Glasfaseroptik in der Weise quer zur laufenden Papierbahn angeordnet, so daß sie breiter als die Papierbahn ist, die Papierbahn zwischen der Lichtquelle und der Glasfaseroptik läuft und somit die Papierbahn auf die Lichtwellenleiter-Zeile projezierbar ist.To achieve this object, a scanner is proposed according to the invention in an arrangement of the type mentioned, which has a glass fiber optic in which individual optical waveguides are arranged on the one hand transversely to the running paper web in an optical waveguide row which is wider than the paper web and on the other hand the optical waveguides in one Cross-sectional converters are bundled in such a way that a CCD sensor chip integrated in the scanning device can be illuminated in terms of picture elements. The CCD sensor chip is connected to the image evaluation and control unit. The light source is arranged opposite the glass fiber optics in the manner transverse to the running paper web, so that it is wider than the paper web, the paper web runs between the light source and the glass fiber optics, and thus the paper web can be projected onto the optical waveguide line.

Weitere zweckmäßige Ausgestaltungen und vorteilhafte Weiterbildungen der übergeordneten Maßnahmen ergeben sich aus der nachstehenden Beschreibung eines Ausführungsbeispiels anhand der Zeichnung, die schematisch zeigt:

Fig. 1
eine Prinzipdarstellung einer erfindungsgemäßen Anordnung,
Fig. 2
der prinzipielle mechanische Aufbau einer erfindungsgemäßen Anordnung und
Fig. 3
eine Gesamtdarstellung einer zu überwachenden Druckmaschine mit einer erfindungsgemäßen Anordnung.
Further expedient refinements and advantageous developments of the superordinate measures result from the following description of an exemplary embodiment with reference to the drawing, which shows schematically:
Fig. 1
a schematic diagram of an arrangement according to the invention,
Fig. 2
the basic mechanical structure of an arrangement according to the invention and
Fig. 3
an overall view of a printing press to be monitored with an arrangement according to the invention.

In der Fig. 1 ist mit 1 die senkrecht zur Zeichenebene laufende Papierbahn bezeichnet. Über der Papierbahn 1 ist eine Abtastvorrichtung 2 angeordnet, die eine Glasfaseroptik 3 aufweist. Die einzelnen Lichtwellenleiter 4 der Glasfaseroptik 3 sind einerseits quer zur laufenden Papierbahn 1 in einer Lichtwellenleiter-Zeile 5 zusammengefaßt, die breiter als die Papierbahn 1 ist und somit in der dargestellten Weise Lichtwellenleiter 4 aufweist, die links und rechts über die Ränder der Papierbahn 1 schauen. Andererseits sind die Lichtwellenleiter 4 in einem Querschnittswandler 6 gebündelt und leuchten ein in die Abtastvorrichtung 2 integrierten CCD-Sensor-Chip 7 aus.In Fig. 1, 1 denotes the paper web running perpendicular to the plane of the drawing. A scanning device 2 is arranged above the paper web 1 and has a glass fiber optic 3. The individual optical fibers 4 of the glass fiber optics 3 are combined on the one hand transversely to the running paper web 1 in an optical fiber line 5 which is wider than the paper web 1 and thus has optical fibers 4 in the manner shown, which look left and right over the edges of the paper web 1 . On the other hand, the optical fibers 4 are bundled in a cross-sectional converter 6 and illuminate a CCD sensor chip 7 integrated in the scanning device 2.

In vorteilhafter Weise sind die Lichtwellenleiter 4 in Kunstharz eingebettet und die der Papierbahn 1 zugekehrten Stirnfläche poliert. Dadurch wird die Reinigung der Lichtwellenleiter-Zeile 5 im Betrieb der Druckmaschine erleichtert.Advantageously, the optical fibers 4 are embedded in synthetic resin and the end face facing the paper web 1 is polished. This simplifies the cleaning of the optical fiber line 5 during operation of the printing press.

Der Querschnittswandler 6 hat die Funktion, die Positionen 8 (1-N) der Lichtwellenleiter 4 auf der Lichtwellenleiter-Zeile 5 in einen Querschnitt umzuwandeln, der der Fläche des CCD-Sensor-Chips 7 entspricht. Der CCD-Sensor-Chip 7 kann ein Linien-Element, aber auch ein Flächen-Element sein.The cross-sectional converter 6 has the function of converting the positions 8 (1-N) of the optical waveguides 4 on the optical waveguide row 5 into a cross-section which corresponds to the area of the CCD sensor chip 7. The CCD sensor chip 7 can be a line element, but also a surface element.

Der CCD-Sensor-Chip 7 ist in ansich bekannter Weise mit der Bildauswerte- und Steuereinheit 9 verbunden, von der aus Sicherungssysteme der Druckmaschine, wie z.B. eine Papierfangvorrichtung 10 (Fig. 3) ansteuerbar sind.The CCD sensor chip 7 is connected in a manner known per se to the image evaluation and control unit 9, from which security systems of the printing press, e.g. a paper catch device 10 (FIG. 3) can be controlled.

Eine vorteilhafte Weiterbildung und zweckmäßige Ausgestaltung der übergeordneten Vorrichtungsmaßnahmen ist darin zu sehen, daß, wie im Ausführungsbeispiel gezeigt ist, in die Abtasteinrichtung 2 mehrere Reflexlichttaster zur Erfassung einer Höhenbewegung der laufenden Papierbahn 1 integriert und ebenfalls mit der Bildauswerte- und Steuereinheit 9 eine Verbindung aufweist, so daß mittels dieser zusätzlichen Informationsquelle auch eine Höhenauslenkung der Papierbahn (z. B. nach Papierri im Trockner) sicher erkannt wird.An advantageous further development and expedient embodiment of the higher-level device measures is to be seen in the fact that, as shown in the exemplary embodiment, several reflective light scanners for detecting a height movement of the running paper web 1 are integrated in the scanning device 2 and also have a connection to the image evaluation and control unit 9, so that by means of this additional information source also a vertical deflection of the paper web (for example after paper paper in the dryer) is reliably recognized.

Auf der, der Lichtwellenleiter-Zeile 5 abgekehrten Seite der Papierbahn 1 ist quer zu dieser und parallel zu der Lichtwellenleiter-Zeile 5 eine stabförmige Lichtquelle 12 angeordnet. Die Lichtquelle 12 weist die gleiche Breite wie die Lichtwellenleiter-Zeile 5 auf, so daß die zur Papierbahn 1 überstehenden Lichtwellenleiter 4 beleuchtbar sind.On the side of the paper web 1 facing away from the optical waveguide row 5, a rod-shaped light source 12 is arranged transversely to this and parallel to the optical waveguide row 5. The light source 12 has the same width as the optical waveguide row 5, so that the optical waveguides 4 protruding from the paper web 1 can be illuminated.

So wird bei der Überwachung der laufenden Papierbahn 1 diese in ihrer Breite auf die Lichtwellenleiter-Zeile 5 projiziert, d.h. bei unversehrter Papierbahn werden nur die über die Ränder der Papierbahn 1 überstehenden Lichtwellenleiter 4 beleuchtet. Die Anzahl der unbeleuchteten Lichtwellenleiter 4 ist ein Maß dafür, ob die Papierbahn fehlerfrei ist, oder schon Bahnrisse bzw. Löcher aufweist. dabei ist der Abstand der Glasfaseroptik (3), d. h. der Lichtwellenleiter-Zeile 5 zur Papierbahn 1 so eingestellt, daß eine zeilenmäßige Auflösung zwischen 1 und 5 mm erreichbar ist.Thus, when monitoring the running paper web 1, its width is projected onto the optical waveguide row 5, ie in the case of an intact paper web only the optical waveguides 4 projecting beyond the edges of the paper web 1 are illuminated. The number of non-illuminated optical waveguides 4 is a measure of whether the paper web is free of defects or has web tears or holes. the distance between the glass fiber optics (3), ie the optical fiber line 5 to the paper web 1, is set so that a line resolution between 1 and 5 mm can be achieved.

Die Bildauswerte- und Steuereinheit 9 umfaßt im wesentlichen einen Bildaufnahmeteil und einen Mikroprozessor für die Bildverarbeitung. In einem einmaligen Eichprozeß wird die Zuordnung der Lichtwellenleiter-Positionen 8 (1-N) zu den Pixseln (1-M) des CCD-Sensor-Chips 7 getroffen. Es ist jedoch auch denkbar, die Lichtwellenleiter 4 beim Bündeln im Querschnittswandler 6 so zu sortieren, daß die Zuordnung fest vorgegeben ist. Somit ist ein weiterer, ganz besonderer Vorteil der erfindungsgemäßen Maßnahmen darin zu sehen, daß auf eine aufwendige Optik und eine daraus resultierende Justierung in der Maschine in beiden Fällen verzichtet werden kann.The image evaluation and control unit 9 essentially comprises an image recording part and a microprocessor for image processing. In a one-time calibration process, the assignment of the optical fiber positions 8 (1-N) to the pixels (1-M) of the CCD sensor chip 7 is made. However, it is also conceivable to sort the optical fibers 4 when bundling in the cross-sectional converter 6 so that the assignment is fixed. Thus, a further, very special advantage of the measures according to the invention can be seen in the fact that complex optics and the resulting adjustment in the machine can be dispensed with in both cases.

Die Bildauswerte- und Steuereinheit 9 weist außerdem Ausgänge 15, wie Parallelausgänge für die direkte Ansteuerung von Schutzeinrichtungen, wie z.B. eine Papierfangvorrichtung 10 (Fig. 3) oder einer frei programmierbaren Steuerung oder serielle Ausgänge zur Ankoppelung an ein bestehendes System auf.The image evaluation and control unit 9 also has outputs 15, such as parallel outputs for the direct control of protective devices, such as e.g. a paper catch device 10 (FIG. 3) or a freely programmable controller or serial outputs for coupling to an existing system.

Fig. 2 zeigt nochmals die erfindungsgemäße Anordnung in ihrem prinzipiellen mechanischen Aufbau. In einen Rahmen 13 ist die Lichtquelle 12, die Lichtwellenleiter-Zeile 5, der Querschnittswandler 6 und eine Einheit 14 mit dem CCD-Sensor-Chip 6 und der Bildauswerte- und Steuereinheit 9 platzsparend eingebaut, so daß die Anordnung an beliebiger Stelle der Druckmaschine einhängbar und die Papierbahn 1 zwischen der Lichtquelle 12 und der Lichtwellenleiter-Zeile 5 in der dargestellten Weise durchführbar ist. In den Rahmen 13 sind auch Reflexlichttaster 11 integrierbar. Der Anschluß an die externe Steuerung erfolgt über die Leitung 15. Da die Justage eines optischen Systems entfällt ist es in einfacher Weise möglich, die komplette Einheit 5,6,11-15 für Wartungsarbeiten wegzuklappen oder auch auszuhängen.Fig. 2 shows the arrangement according to the invention in its basic mechanical structure. In a frame 13, the light source 12, the fiber optic line 5, the cross-sectional converter 6 and a unit 14 with the CCD sensor chip 6 and the image evaluation and control unit 9 is installed in a space-saving manner, so that the arrangement can be hung anywhere on the printing press and the paper web 1 can be carried out between the light source 12 and the optical waveguide row 5 in the manner shown. Diffuse sensors 11 can also be integrated in the frame 13. The connection to the external control is made via the line 15. Since the adjustment of an optical system is not necessary, it is possible in a simple manner to fold away or even unhook the entire unit 5, 6, 11, 15 for maintenance work.

Fig. 3 zeigt ein Anwendungsbeispiel einer erfindungsgemäßen Anordnung. Bei einer mindestens eine Druckeinheit 18, eine Papierfangvorrichtung 10, einen Trockner 19 und ein Kühlwerk 20 aufweisende Druckmaschine ist in Laufrichtung der Papierbahn 1 in geringem Abstand hinter den Zylindern 21,22 der Druckeinheit 18 eine erfindungsgemäße Anordnung 23 zur Überwachung des Laufes der Papierbahn 1 zwischen die Seitenwände der Druckeinheit 18 eingehängt. Im gezeigten Beispiel tritt ein Bruch der Papierbahn 1 im Trockner 19 auf. Wie die Erfahrung gezeigt hat, äußert sich ein Bruch der Papierbahn durch das Spannungsloswerden am ehesten am Druckwerk selbst, in dem das Papier aus seiner geraden Laufbahn gerät und an einem Zylinder 21 oder 22 infolge der Zähflüssigkeit der Druckfarbe und wegen der zur Bahn schrägen Lage der Verbindungsebene der beiden Zylinderachsen haften bleibt, wobei das übergeschossene Ende sogar zurückgezogen wird. Durch das vorteilhafte Zusammenwirken der Reflexlichttaster 11 mit der Lichtwellenleiter-Zeile 5 wird dies ausreichend schnell erkannt und die Papierfangvorrichtung 10 aktiviert. Der grundsätzliche Aufbau und die Wirkungsweise einer Papierfangvorrichtung sind ansich bekannt und bedürfen daher im vorliegenden Zusammenhang keiner eingehenden Erläuterung mehr.3 shows an application example of an arrangement according to the invention. In the case of a printing machine having at least one printing unit 18, a paper catching device 10, a dryer 19 and a cooling unit 20, an arrangement 23 according to the invention for monitoring the running of the paper web 1 is located at a short distance behind the cylinders 21, 22 of the printing unit 18 in the running direction of the paper web 1 the side walls of the printing unit 18 mounted. In the example shown, the paper web 1 breaks in the dryer 19. As experience has shown, a break in the paper web is most likely manifested by the loss of tension in the printing unit itself, in which the paper gets out of its straight career and in a cylinder 21 or 22 as a result of the viscosity of the printing ink and because of the oblique position of the web Connection plane of the two cylinder axes remains stuck, with the overshot end even being pulled back. Due to the advantageous interaction of the diffuse sensors 11 with the optical fiber line 5, this is recognized sufficiently quickly and the paper catching device 10 is activated. The basic structure and the mode of operation of a paper catching device are known per se and therefore do not require any detailed explanation in the present context.

Claims (6)

  1. Arrangement for the photo-electric monitoring of the path of webs or sheets, in particular paper webs in rotary printing machines, having a scanning device including a light source and a light-sensitive receiver, and an evaluation and control unit from which consecutive operations of the printing machine can be deduced, characterised in that the scanning device (2) has a glass fibre optical system (3) in which individual waveguides (4) on the one hand are arranged tranversely to the moving paper web (1) in a waveguide row (5) which is wider than the paper web, and on the other hand the waveguides (4) are bundled in a cross-sectional transducer (6) in such a way that a CCD sensor chip (7) integrated into the scanning device can be illuminated by image-elements, the CCD sensor chip (7) is connected to the image evaluation and control unit (9), and in that the light source (12) is arranged with respect to the glass fibre optical system (3) transversely to the moving paper web (1) in such a way that it is wider than the paper web (1), the paper web (1) can be guided through between the light source (12) and the glass fibre optical system (3), and hence the paper web (1) can be completely projected onto the waveguide row (5).
  2. Arrangement according to claim 1, characterised in that the waveguides (4) are embedded in synthetic resin and the surface facing the paper web (1) is polished.
  3. Arrangement according to one of the preceding claims, characterised in that the distance of the glass fibre optical system (3) from the paper web (1) is adjusted so that a row resolution of between 1 and 5 mm can be achieved.
  4. Arrangement according to claim 1, characterised in that the CCD sensor chip (7) is a linear element.
  5. Arrangement according to claim 1, characterised in that the CCD sensor chip (7) is an area element.
  6. Arrangement according to claim 1, characterised in that reflection light sensors (11) are integrated into the scanning device (2) for detecting a height movement of the moving paper web (1).
EP92115396A 1991-09-14 1992-09-09 Arrangement for photoelectrically monitoring the movement of webs or sheets, in particular paper webs in rotary printing machines Expired - Lifetime EP0533043B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4130677 1991-09-14
DE4130677A DE4130677C2 (en) 1991-09-14 1991-09-14 Device for photoelectric monitoring of the run of webs in rotary printing machines

Publications (2)

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EP0533043A1 EP0533043A1 (en) 1993-03-24
EP0533043B1 true EP0533043B1 (en) 1996-03-06

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EP92115396A Expired - Lifetime EP0533043B1 (en) 1991-09-14 1992-09-09 Arrangement for photoelectrically monitoring the movement of webs or sheets, in particular paper webs in rotary printing machines

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US (1) US5395027A (en)
EP (1) EP0533043B1 (en)
JP (1) JPH05269974A (en)
CA (1) CA2077721C (en)
DE (2) DE4130677C2 (en)

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Also Published As

Publication number Publication date
CA2077721C (en) 1997-11-25
EP0533043A1 (en) 1993-03-24
US5395027A (en) 1995-03-07
DE59205558D1 (en) 1996-04-11
DE4130677C2 (en) 1995-11-23
CA2077721A1 (en) 1993-03-15
DE4130677A1 (en) 1993-03-18
JPH05269974A (en) 1993-10-19

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