EP0429970B1 - Web break switch - Google Patents

Web break switch Download PDF

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Publication number
EP0429970B1
EP0429970B1 EP90121858A EP90121858A EP0429970B1 EP 0429970 B1 EP0429970 B1 EP 0429970B1 EP 90121858 A EP90121858 A EP 90121858A EP 90121858 A EP90121858 A EP 90121858A EP 0429970 B1 EP0429970 B1 EP 0429970B1
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EP
European Patent Office
Prior art keywords
web
deflection
break detector
longitudinal edge
plane
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
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EP90121858A
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German (de)
French (fr)
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EP0429970A2 (en
EP0429970A3 (en
Inventor
Werner Dipl.-Ing. Kettl (Fh)
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Grafotec Kotterer GmbH
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Grafotec Kotterer GmbH
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Publication of EP0429970A3 publication Critical patent/EP0429970A3/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H26/00Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
    • B65H26/02Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs
    • B65H26/025Warning 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

Definitions

  • the invention relates to a web break switch for web processing machines, in particular web-fed rotary printing presses, with at least one scanning device assigned to the web, preferably in the form of a light barrier that can be interrupted by the web and by means of which a signal can be generated in the event of an impermissible change in location of the web.
  • the scanning device here consists of light barriers provided above and below the normal path level, the transmitters and receivers of which are each arranged in the region of opposite longitudinal edges of the path in such a way that the light beam between the transmitter and receiver does not collide with the path during normal operation and in the event of an impermissible deflection the path is interrupted by this.
  • the deflection of the web in the event of a web break caused by a web break is said to be due to the cylinders of the last, before the break point passed printing unit.
  • the light barriers are arranged at a short distance behind these cylinders. It is true that the web rises when the web tension is eliminated due to the adhesive effect of the paint on one of the cylinders.
  • a web catching device which has a suction roller arranged a short distance below the web and a nozzle bar arranged above the web, the nozzles of which are blown with air, by means of which the web is pressed against the suction roller when the web tension is eliminated becomes.
  • the vacuum generated in the suction roll is registered by a pressure-voltage converter and converted into electrical signals for machine and unit control.
  • the suction roller provided here must be driven. A drive train branched off from the main machine drive is therefore required. This often makes retrofitting existing machines with such a device impossible or at least difficult, not to mention the required energy requirement.
  • each scanning device which is arranged in the region of a longitudinal edge of the web, is assigned a deflection device, by means of which a permanently on the area of the assigned Longitudinal edge of the web acting deflection force which can be overcome by the web train in the case of trouble-free operation can be generated, by means of which the longitudinal web edge can be deflected with respect to the web plane in the case of trouble-free operation and can be moved relative to the scanning device when the web train is omitted.
  • the arrangement according to the invention is advantageously location-independent. This enables the web break switch according to the invention to be arranged precisely where monitoring of the web is particularly appropriate, that is to say in experience in areas particularly prone to breakage, for example in the area of a dryer downstream of the last printing unit, and where access to other units is not impeded.
  • Decisive for the achievable, advantageous location independence is not only the deflection device assigned to each scanning device, but also its arrangement such that only one web edge has to be monitored and deflected. In the area of the web edge, the instability is felt the greatest and fastest when the web train ceases to exist, which ensures high reliability and particularly short dead times.
  • the fact that only the web edge is monitored results in not only a very compact arrangement, but also a highly simple and inexpensive construction.
  • no drive is advantageously required. As a result of the location independence achieved and the simple and compact, in particular drive-less design, it is therefore also easy to retrofit existing machines with the invention Web break switches possible.
  • the deflection device has an air nozzle, preferably a blowing nozzle, which is connected to a pressure difference generating device, preferably to a compressed air source, and is set up for a flow direction directed in the deflection direction, preferably arranged opposite the web surface at the rear in the deflection direction.
  • a blowing nozzle can be particularly advantageous because the compressed air source required here is usually already available in the form of a compressed air network.
  • the air jet that can be achieved with a blowing nozzle can be precisely aligned to the desired area of the longitudinal edge of the web and the force that can be generated in this way can be adjusted in a simple manner.
  • the use of a suction nozzle is advantageously associated with a certain vacuum cleaner effect.
  • a further advantageous measure can consist in that the scanning device is arranged with an axis inclined to the direction of force of the deflection device and extending within a plane running transversely to the longitudinal direction of the web.
  • the deflection device can expediently be arranged with a force direction running approximately perpendicular to the path plane and the scanning device with the axis intersecting the path plane at an acute angle. As a result of the direction of force perpendicular to the path plane, this results in a powerful, reliable deflection of the path.
  • a further, particularly advantageous measure can consist in the fact that the axis of the scanning device passed by a longitudinal edge of the web extends in the deflection direction of the web to the outside. This ensures that the deflected longitudinal edge of the web is brought out of engagement with the scanning device.
  • This can therefore simply be designed as a light barrier which scans the longitudinal edge of the web and is interrupted by the longitudinal edge of the web during normal operation, with a transmitter or receiver arranged above or below the web. In normal operation, the light beam between the transmitter and receiver is interrupted. In the event of a web break, the light beam is released between the transmitter and the receiver, producing the desired signal. Since no continuous signal is generated here, a simple circuit advantageously results.
  • the direction of force can the deflection device is directed vertically from top to bottom and the element of the scanning device arranged below the plane of the web is offset to the outside with respect to the assigned upper element, preferably arranged outside the longitudinal edge of the web.
  • Particularly short response times are to be expected here, since the fully effective deflection force is supported by gravity and since the longitudinal edge of the web is already brought out of engagement with the scanning device with a comparatively small deflection.
  • the paper web 1 on which FIG. 1 is based is printed in a printing machine indicated by its last printing unit 2 and then dried in a dryer 3.
  • the area of the dryer 3 belongs to the areas in which the paper web 1 is particularly at risk of pressure.
  • a web catching device 5 is provided upstream of the danger zone, here the dryer 3, which is activated in the event of a web break.
  • the web catching device 5 is simply designed as a web clamping device. Instead of such a clamping device, other designs are of course also conceivable, for example winding devices or web-cutting devices etc. Simultaneously with the activation of the web-catching device 5, the drive of the printing press 2 is stopped.
  • one or more web break switches 6 are provided in the danger zone, which monitor the position of the web and emit a signal in the event of an impermissible change in the location of the web.
  • corresponding web break switches 6 are provided in the area of the inlet and outlet of the dryer 3. These can each be received on a holder 7 attached to the housing of the dryer 3.
  • web break switches and web catch devices which can be activated thereby can also be provided in other endangered areas, for example in the area between two successive printing units.
  • the web break switches 6 each contain a light barrier, which consists of a transmitter 8 and a receiver 9, scanning an associated web longitudinal edge, the elements of which are arranged opposite one another with respect to the web level maintained during normal operation, that is to say above and below the normal web level.
  • the transmitter 8 is located above the web level and the receiver 9 below the web level.
  • the optical axis 10 of the light barriers indicated by a dash-dotted line in FIG. 2 corresponds to the beam path of the light beam between the transmitter and the assigned receiver.
  • the optical axis 10 of the light barriers of the web break switches 6 arranged in the region of the web longitudinal edges is cut by the respectively assigned longitudinal edge of the web 1, as can be clearly seen from FIG.
  • the light beam between the transmitter 8 and the receiver 9 is interrupted by the longitudinal edge of the paper web 1 immersed between the transmitter 8 and the receiver 9.
  • the light barrier containing the transmitter 8 and the receiver 9 accordingly emits no signal.
  • the longitudinal edge of the paper web 1 which dips into the light barrier can be deflected relative to the normal web plane to such an extent that the intersection between the optical Axis 10 and the paper web 1 and thus the interruption of the beam path between the transmitter 8 and the receiver 9 omitted.
  • the light beam emitted by the transmitter 8 strikes the receiver 9, as a result of which the receiver generates a signal which can be used to activate the web catching device 5 and to stop the printing press 2, as in FIG. 1 through the signal line 11 with the web break switches 6 outgoing inputs 12 and the web guiding device 5 and the printing machine 2 leading outputs 13 is indicated.
  • each scanning device here in the form of a light barrier, is assigned a deflection device, which in the exemplary embodiment shown is simply as in the area of the assigned scanning device the top of the longitudinal edge of the paper web 1 directed blowing nozzle 14 is formed, which can be acted upon with compressed air.
  • the blowing nozzles are connected to a compressed air source, here in the form of an internal compressed air network 15, as indicated in FIG. 1 by spur lines 16.
  • blowing nozzles 14 are directed approximately perpendicular to the normal transport plane of the paper web 1 onto the region of the longitudinal edge of the paper web 1 which engages in the light barrier, here towards the longitudinal edge region lying outside the intersection between the optical axis 10 and the paper web 1.
  • Force indicated by the arrow 17 are set so that the longitudinal edge of the paper web 1 is not deflected when the web is present, that is to say during normal operation. In normal operation, the force indicated by arrow 17 is accordingly overcome by the train. Only when the web tension is omitted as a result of a web break that has occurred does the blowing nozzle 14 cause the deflection of the associated longitudinal edge of the paper web 1, indicated by a broken line in FIG. 2, as a result of which the switching process described above is brought about.
  • the blowing nozzle 14 directed perpendicularly to the longitudinal edge region of the paper web 1 brings about a downward deflection of the lateral edge region of the paper web 1.
  • the optical axis 10 of the light barrier forming the scanning device is arranged parallel to a plane running transversely to the longitudinal direction of the paper web 1 and inclined relative to the normal transport plane of the paper web so that it is in the deflection direction, that is to say from top to bottom , runs outwards.
  • the receiver 9 of the light barrier arranged below the normal transport plane of the paper web 1 is accordingly offset from the outside relative to the transmitter 8 arranged above the normal transport plane of the paper web 1.
  • the optical axis 10 is inclined at an acute angle of 45 ° with respect to the normal paper web plane, which is a wide offset between Transmitter 8 and receiver 9 enables.
  • the element of the scanning device here the receiver 9, which is arranged below the plane of the paper web
  • the element of the scanning device here the receiver 9, which is arranged below the plane of the paper web
  • the upper element that is to say the rear element in the deflection direction, here the transmitter 8, can be arranged within the paper web 1 without further notice.
  • a suction nozzle could also be provided, through which the associated edge region of the paper web 1 is sucked in as soon as it is unstable enough.
  • a suction nozzle would have to be arranged below the normal paper web plane.
  • the light barrier which acts as a scanning device, in such a way that a normal signal is generated during normal operation, which signal is interrupted in the event of a deflection of the paper web.
  • only the optical axis 10 would have to be rotated by 90 ° and moved outwards to such an extent that no collision between axis 10 and paper web 1 takes place during normal operation.
  • FIG. 2 two web break switches 6 which are opposite one another and are arranged symmetrically with respect to a web with a longitudinal plane are indicated.
  • a high level of safety and particularly short dead times are achieved, since the tear of a paper web is always on one longitudinal edge begins and ends at the other longitudinal edge. If both longitudinal edges are monitored, it is ensured that the desired switching process takes place at the start of a crack.
  • the light barrier on which the above-described example is based to form the scanning device represents a particularly simple, inexpensive and robust component.
  • electrical switches for scanning the longitudinal edges of the web expediently in the form of so-called capacitive switches. This would also make it possible to achieve contactless path scanning.

Landscapes

  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Sheets Or Webs (AREA)

Description

Die Erfindung betrifft einen Bahnreißschalter für bahnverarbeitende Maschinen, insbesondere Rollenrotationsdruckmaschinen, mit wenigstens einer der Bahn zugeordneten Abtasteinrichtung, vorzugsweise in Form einer von der Bahn unterbrechbaren Lichtschranke, durch die im Falle einer unzulässigen Ortsveränderung der Bahn ein Signal erzeugbar ist.The invention relates to a web break switch for web processing machines, in particular web-fed rotary printing presses, with at least one scanning device assigned to the web, preferably in the form of a light barrier that can be interrupted by the web and by means of which a signal can be generated in the event of an impermissible change in location of the web.

Eine Anordnung dieser Art ist aus der DE-B 21 56 506 bekannt. Die Abtasteinrichtung besteht hier aus oberhalb und unterhalb der normalen Bahnebene vorgesehenen Lichtschranken, deren Sender und Empfänger jeweils im Bereich einander gegenüberliegender Längskanten der Bahn so angeordnet sind, daß der Lichtstrahl zwischen Sender und Empfänger bei Normalbetrieb mit der Bahn nicht kollidiert und im Falle einer unzulässigen Auslenkung der Bahn von dieser unterbrochen wird. Die Auslenkung der Bahn im Falle eines durch einen Bahnriß verursachten Wegfalls des Bahnzugs soll dabei durch die Zylinder des letzten, vor der Bruchstelle durchlaufenen Druckwerks bewirkt werden. Dementsprechend sind die Lichtschranken hier in geringem Abstand hinter diesen Zylindern angeordnet. Es ist zwar richtig, daß die Bahn bei wegfallendem Bahnzug aufgrund der Adhäsionswirkung der Farbe an einem der Zylinder hochsteigt. Dieser Auslenkung der Bahn wirkt jedoch die Trägheit der Bahn entgegen, so daß der Auslenkvorgang vergleichsweise langsam verläuft. Es kann daher bei der bekannten Anordnung vergleichsweise lange dauern, bis ein Signal, z.B. zum Stillsetzen der Maschine, ausgelöst wird. In der Zeit zwischen Bahnriß und Maschinenstillstand wird jedoch Makulatur produziert, was sich ungünstig auf die Materialkosten und die Umweltverträglichkeit auswirkt. Hinzu kommt, daß die Lichtschranken bei der bekannten Anordnung in geringem Abstand von den Zylindern des Druckwerks und dementsprechend in einem Bereich angeordnet sein müssen, in welchem Farbnebel etc. nicht vermeidbar sind, was zu einer Verschmutzung der Elemente der Lichtschranken und damit zu Funktionsstörungen führen kann. Außerdem wird durch die mit geringem Abstand hinter den Zylindern angeordneten Lichtschranken die Zugänglichkeit zu den Zylindern des Druckwerks beeinträchtigt, was sich ungünstig auf die Bedienungsfreundlichkeit auswirken kann.An arrangement of this type is known from DE-B 21 56 506. The scanning device here consists of light barriers provided above and below the normal path level, the transmitters and receivers of which are each arranged in the region of opposite longitudinal edges of the path in such a way that the light beam between the transmitter and receiver does not collide with the path during normal operation and in the event of an impermissible deflection the path is interrupted by this. The deflection of the web in the event of a web break caused by a web break is said to be due to the cylinders of the last, before the break point passed printing unit. Accordingly, the light barriers are arranged at a short distance behind these cylinders. It is true that the web rises when the web tension is eliminated due to the adhesive effect of the paint on one of the cylinders. However, this deflection of the web counteracts the inertia of the web, so that the deflection process is comparatively slow. In the known arrangement, it can therefore take a comparatively long time for a signal to be triggered, for example to stop the machine. However, waste is produced in the period between the web break and the machine downtime, which has an unfavorable effect on material costs and environmental compatibility. In addition, the light barriers in the known arrangement must be arranged at a short distance from the cylinders of the printing unit and accordingly in an area in which ink mist etc. cannot be avoided, which can lead to contamination of the elements of the light barriers and thus to malfunctions . In addition, the accessibility to the cylinders of the printing unit is impaired by the light barriers arranged at a short distance behind the cylinders, which can have an unfavorable effect on the ease of use.

Aus der DE-A 37 35 330 ist eine Bahnfangvorrichtung bekannt, die eine mit geringem Abstand unterhalb der Bahn angeordnete Saugwalze und einen oberhalb der Bahn angeordneten Düsenbalken aufweist, deren Düsen mit Blasluft beaufschlagt werden, durch welche die Bahn bei entfallendem Bahnzug an die Saugwalze angedrückt wird. Der dabei in der Saugwalze entstehende Unterdruck wird von einem Druck-Spannungswandler registriert und in elektrische Signale zur Maschinen- und Aggregatesteuerung umgewandelt. Die hier vorgesehene Saugwalze muß angetrieben werden. Es ist daher ein vom Maschinenhauptantrieb abgezweigter Antriebszug erforderlich. Dies macht vielfach eine Nachrüstung vorhandener Maschinen mit einer derartigen Einrichtung unmöglich oder jedenfalls schwierig, von dem erforderlichen Energiebedarf einmal ganz abgesehen. Außerdem ist bei der bekannten Anordnung ein über die Breite der Bahn durchgehender Düsenbalken mit einer größeren Anzahl von Düsen erforderlich. Es ergibt sich daher auch ein hoher Luftverbrauch. Die bekannte Anordnung erfordert daher vergleichsweise hohe Betriebskosten und einen vergleichsweise hohen baulichen Aufwand. Ein besonderer Nachteil der bekannten Anordnung ist aber darin zu sehen, daß die Bahn hier auf ihrer ganzen Breite ausgelenkt und an die Saugwalze angedrückt werden muß, was infolge der starken Trägkeit der Bahn hohe Kräfte erfordert und daher zu einer nicht unbeträchtlichen Verzögerung führen kann.From DE-A 37 35 330 a web catching device is known which has a suction roller arranged a short distance below the web and a nozzle bar arranged above the web, the nozzles of which are blown with air, by means of which the web is pressed against the suction roller when the web tension is eliminated becomes. The one there The vacuum generated in the suction roll is registered by a pressure-voltage converter and converted into electrical signals for machine and unit control. The suction roller provided here must be driven. A drive train branched off from the main machine drive is therefore required. This often makes retrofitting existing machines with such a device impossible or at least difficult, not to mention the required energy requirement. In addition, in the known arrangement, a continuous nozzle bar with a larger number of nozzles is required over the width of the web. There is therefore also a high air consumption. The known arrangement therefore requires comparatively high operating costs and a comparatively high structural outlay. A particular disadvantage of the known arrangement is to be seen in the fact that the web has to be deflected over its entire width and pressed onto the suction roll, which requires high forces due to the strong inertia of the web and can therefore lead to a not inconsiderable delay.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, eine Vorrichtung eingangs erwähnter Art so zu verbessern, daß die Nachteile der bekannten Anordnungen vermieden werden.Proceeding from this, it is therefore the object of the present invention to improve a device of the type mentioned at the outset in such a way that the disadvantages of the known arrangements are avoided.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß jeder Abtasteinrichtung, die im Bereich einer Bahnlängskante angeordnet ist, eine Auslenkeinrichtung zugeordnet ist, mittels der eine permanent auf den Bereich der zugeordneten Längskante der Bahn wirkende, bei störungsfreiem Betrieb vom Bahnzug überwindbare Auslenkkraft erzeugbar ist, durch welche die Bahnlängskante bei wegfallendem Bahnzug gegenüber der Bahnebene bei störungsfreiem Betrieb auslenkbar und gegenüber der Abtasteinrichtung bewegbar ist.This object is achieved in that each scanning device, which is arranged in the region of a longitudinal edge of the web, is assigned a deflection device, by means of which a permanently on the area of the assigned Longitudinal edge of the web acting deflection force which can be overcome by the web train in the case of trouble-free operation can be generated, by means of which the longitudinal web edge can be deflected with respect to the web plane in the case of trouble-free operation and can be moved relative to the scanning device when the web train is omitted.

Die erfindungsgemäße Anordnung ist in vorteilhafter Weise standortunabhängig. Dies ermöglicht eine Anordnung des erfindungsgemäßen Bahnreißschalters genau da, wo eine Überwachung der Bahn besonders angebracht ist, das heißt in erfahrungsgemäß besonders bruchgefährdeten Bereichen, z.B. im Bereich eines des letzten Druckwerk nachgeordneten Trockners, und wo die Zugänglichkeit zu anderen Aggregaten nicht behindert wird. Maßgebend für die erreichbare, vorteilhafte Standortunabhängigkeit ist dabei nicht nur die jeder Abtasteinrichtung zugeordnete Auslenkeinrichtung, sondern auch deren Anordnung derart, daß lediglich eine Bahnkante überwacht und ausgelenkt werden muß. Im Bereich der Bahnkante ist nämlich die Labilität bei wegfallendem Bahnzug am größten und am schnellsten zu spüren, was eine hohe Zuverlässigkeit und besonders geringe Totzeiten gewährleistet. Dadurch, daß nur die Bahnkante überwacht wird, ergibt sich auch nicht nur eine sehr kompakte Anordnung, sondern auch eine höchst einfache und kostengünstige Bauweise. In vorteilhafter Weise wird bei der erfindungsgemäßen Anordnung kein Antrieb benötigt. Infolge der erreichten Standortunabhängigkeit und der einfachen und kompakten, insbesondere antriebslosen Bauweise ist daher auch eine einfache Nachrüstung vorhandener Maschinen mit erfindungsgemäßen Bahnreißschaltern möglich.The arrangement according to the invention is advantageously location-independent. This enables the web break switch according to the invention to be arranged precisely where monitoring of the web is particularly appropriate, that is to say in experience in areas particularly prone to breakage, for example in the area of a dryer downstream of the last printing unit, and where access to other units is not impeded. Decisive for the achievable, advantageous location independence is not only the deflection device assigned to each scanning device, but also its arrangement such that only one web edge has to be monitored and deflected. In the area of the web edge, the instability is felt the greatest and fastest when the web train ceases to exist, which ensures high reliability and particularly short dead times. The fact that only the web edge is monitored results in not only a very compact arrangement, but also a highly simple and inexpensive construction. In the arrangement according to the invention, no drive is advantageously required. As a result of the location independence achieved and the simple and compact, in particular drive-less design, it is therefore also easy to retrofit existing machines with the invention Web break switches possible.

Vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den Unteransprüchen angegeben. So kann es besonders vorteilhaft sein, wenn die Auslenkeinrichtung eine Luftdüse, vorzugsweise eine Blasdüse, aufweist, die an eine Druckdifferenzerzeugungseinrichtung, vorzugsweise an eine Druckluftquelle, angeschlossen und für eine in Auslenkrichtung gerichtete Durchströmrichtung eingerichtet, vorzugsweise der in Auslenkrichtung hinteren Bahnoberfläche gegenüberliegend angeordnet ist. Diese Maßnahmen ergeben in vorteilhafter Weise eine berührungslos arbeitende Auslenkeinrichtung. Die Verwendung einer Blasdüse kann dabei besonders vorteilhaft sein, weil die hier benötigte Druckluftquelle in der Regel in Form eines Druckluftnetzes bereits zur Verfügung steht. Zudem lassen sich der mit einer Blasdüse erzielbare Luftstrahl genau auf den gewünschten Bereich der Bahnlängskante ausrichten und die hiermit erzeugbare Kraft auf einfache Weise justieren. Die Verwendung einer Saugdüse ist demgegenüber in vorteilhafter Weise mit einem gewissen Staubsaugereffekt verbunden.Advantageous refinements and appropriate further training of the higher-level measures are specified in the subclaims. It can be particularly advantageous if the deflection device has an air nozzle, preferably a blowing nozzle, which is connected to a pressure difference generating device, preferably to a compressed air source, and is set up for a flow direction directed in the deflection direction, preferably arranged opposite the web surface at the rear in the deflection direction. These measures advantageously result in a contactless deflection device. The use of a blowing nozzle can be particularly advantageous because the compressed air source required here is usually already available in the form of a compressed air network. In addition, the air jet that can be achieved with a blowing nozzle can be precisely aligned to the desired area of the longitudinal edge of the web and the force that can be generated in this way can be adjusted in a simple manner. In contrast, the use of a suction nozzle is advantageously associated with a certain vacuum cleaner effect.

Eine weitere vorteilhafte Maßnahme kann darin bestehen, daß die Abtasteinrichtung mit zur Kraftrichtung der Auslenkeinrichtung geneigter, innerhalb einer quer zur Bahnlängsrichtung verlaufenden Ebene sich erstreckender Achse angeordnet ist. Infolge der hier vorgesehenen Neigung der Abtastrichtung zur Auslenkrichtung wird sichergestellt, daß die überwachte Bahnlängskante im Falle einer Auslenkung schnell und zuverlässig in beziehungsweise außer Wirkeingriff mit der Abtasteinrichtung gebracht werden kann.A further advantageous measure can consist in that the scanning device is arranged with an axis inclined to the direction of force of the deflection device and extending within a plane running transversely to the longitudinal direction of the web. As a result of the inclination of the scanning direction to the deflection direction provided here, it is ensured that the monitored longitudinal edge of the web in the event of a Deflection can be brought quickly and reliably into or out of operative engagement with the scanning device.

Zweckmäßig können dabei die Auslenkeinrichtung mit etwa lotrecht zur Bahnebene verlaufender Kraftrichtung und die Abtasteinrichtung mit die Bahnebene unter einem spitzen Winkel schneidender Achse angeordnet sein. Infolge der zur Bahnebene lotrechten Kraftrichtung ergibt sich hierbei eine kraftvolle, zuverlässige Auslenkung der Bahn.The deflection device can expediently be arranged with a force direction running approximately perpendicular to the path plane and the scanning device with the axis intersecting the path plane at an acute angle. As a result of the direction of force perpendicular to the path plane, this results in a powerful, reliable deflection of the path.

Eine weitere, besonders vorteilhafte Maßnahme kann darin bestehen, daß die Achse der von einer Bahnlängskante passierten Abtasteinrichtung in Auslenkrichtung der Bahn nach außen verläuft. Hierdurch wird sichergestellt, daß die ausgelenkte Bahnlängskante außer Eingriff mit der Abtasteinrichtung gebracht wird. Diese kann daher einfach als die Bahnlängskante abtastende, bei Normalbetrieb von der Bahnlängskante unterbrochene Lichtschranke mit oberhalb bzw. unterhalb der Bahn angeordnetem Sender bzw. Empfänger ausgebildet sein. Bei Normalbetrieb ist dabei der Lichtstrahl zwischen Sender und Empfänger unterbrochen. Im Falle eines Bahnrisses wird der Lichtstrahl zwischen Sender und Empfänger freigegeben, wodurch das gewünschte Signal erzeugt wird. Da hier kein Dauersignal erzeugt wird, ergibt sich in vorteilhafter Weise eine einfache Schaltung.A further, particularly advantageous measure can consist in the fact that the axis of the scanning device passed by a longitudinal edge of the web extends in the deflection direction of the web to the outside. This ensures that the deflected longitudinal edge of the web is brought out of engagement with the scanning device. This can therefore simply be designed as a light barrier which scans the longitudinal edge of the web and is interrupted by the longitudinal edge of the web during normal operation, with a transmitter or receiver arranged above or below the web. In normal operation, the light beam between the transmitter and receiver is interrupted. In the event of a web break, the light beam is released between the transmitter and the receiver, producing the desired signal. Since no continuous signal is generated here, a simple circuit advantageously results.

In weiterer, besonders zu bevorzugender Ausgestaltung der übergeordneten Maßnahmen können die Kraftrichtung der Auslenkeinrichtung senkrecht von oben nach unten gerichtet und das unterhalb der Bahnebene angeordnete Element der Abtasteinrichtung gegenüber dem zugeordneten, oberen Element nach außen versetzt, vorzugsweise außerhalb der Bahnlängskante angeordnet sein. Hierbei sind besonders kurze Ansprechzeiten zu erwarten, da die voll zur Wirkung kommende Auslenkkraft durch die Schwerkraft unterstützt wird und da die Bahnlängskante bereits bei vergleichsweise geringer Auslenkung außer Wirkeingriff mit der Abtasteinrichtung gebracht wird.In a further, particularly preferred embodiment of the higher-level measures, the direction of force can the deflection device is directed vertically from top to bottom and the element of the scanning device arranged below the plane of the web is offset to the outside with respect to the assigned upper element, preferably arranged outside the longitudinal edge of the web. Particularly short response times are to be expected here, since the fully effective deflection force is supported by gravity and since the longitudinal edge of the web is already brought out of engagement with the scanning device with a comparatively small deflection.

Weitere vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den restlichen Unteransprüchen angegeben.Further advantageous refinements and expedient further training of the superordinate measures are specified in the remaining subclaims.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert.An exemplary embodiment of the invention is explained in more detail below with reference to the drawing.

In der Zeichnung zeigen:

Figur 1
eine schematische Seitenansicht einer Rollenrotationsdruckmaschine und
Figur 2
eine in Bahnlängsrichtung gesehene, schematische Ansicht des erfindungsgemäßen Bahnreißschalters.
The drawing shows:
Figure 1
is a schematic side view of a web-fed rotary printing press and
Figure 2
a seen in the longitudinal direction, schematic view of the web break switch according to the invention.

Die der Figur 1 zugrundeliegende Papierbahn 1 wird in einer durch ihr letztes Druckwerk 2 angedeuteten Druckmaschine bedruckt und anschließend in einem Trockner 3 getrocknet. Der Bereich des Trockners 3 gehört erfahrungsgemäß zu den Bereichen, in denen die Papierbahn 1 besonders druckgefährdet ist. Um im Falle eines Bahnrisses einen sogenannten Wickler zu vermeiden, bei dem sich die Papierbahn 1 auf einen der Zylinder 4 des Druckwerks 2 aufwickelt, ist eine dem Gefahrbereich, hier dem Trockner 3, vorgeordnete Bahnfangvorrichtung 5 vorgesehen, die im Falle eines Bahnrisses aktiviert wird. Die Bahnfangvorrichtung 5 ist im dargestellten Ausführungsbeispiel einfach als Bahnklemmvorrichtung ausgebildet. Anstelle einer derartigen Klemmvorrichtung sind selbstverständlich auch andere Ausführungen denkbar, beispielsweise Aufwickeleinrichtungen bzw. Bahnabschlageinrichtungen etc.. Gleichzeitig mit der Aktivierung der Bahnfangvorrichtung 5 wird der Antrieb der Druckmaschine 2 gestoppt.The paper web 1 on which FIG. 1 is based is printed in a printing machine indicated by its last printing unit 2 and then dried in a dryer 3. Experience has shown that the area of the dryer 3 belongs to the areas in which the paper web 1 is particularly at risk of pressure. In order to avoid a so-called winder in the event of a web break, in which the paper web 1 winds onto one of the cylinders 4 of the printing unit 2, a web catching device 5 is provided upstream of the danger zone, here the dryer 3, which is activated in the event of a web break. In the exemplary embodiment shown, the web catching device 5 is simply designed as a web clamping device. Instead of such a clamping device, other designs are of course also conceivable, for example winding devices or web-cutting devices etc. Simultaneously with the activation of the web-catching device 5, the drive of the printing press 2 is stopped.

Zur Erzeugung des zum Aktivieren der Bahnfangvorrichtung 5 und zum Stoppen der Druckmaschine 2 notwendigen Signals sind im Gefahrbereich ein oder mehrere Bahnreißschalter 6 vorgesehen, welche die Lage der Bahn überwachen und im Falle einer unzulässigen Ortsveränderung der Bahn ein Signal abgeben. Im dargestellten Ausführungsbeispiels mit dem Trockner 3 als Gefahrbereich sind im Bereich des Ein- und Ausgangs des Trockners 3 entsprechende Bahnreißschalter 6 vorgesehen. Diese können jeweils auf einem am Gehäuse des Trockners 3 befestigten Halter 7 aufgenommen sein. Selbstverständlich können auch in anderen gefährdeten Bereichen, beispielsweise im Bereich zwischen zwei aufeinanderfolgenden Druckwerken, Bahnreißschalter und hiervon aktivierbare Bahnfangvorrichtungen vorgesehen sein.To generate the signal required to activate the web catching device 5 and to stop the printing press 2, one or more web break switches 6 are provided in the danger zone, which monitor the position of the web and emit a signal in the event of an impermissible change in the location of the web. In the illustrated embodiment with the dryer 3 as a hazardous area, corresponding web break switches 6 are provided in the area of the inlet and outlet of the dryer 3. These can each be received on a holder 7 attached to the housing of the dryer 3. Of course, web break switches and web catch devices which can be activated thereby can also be provided in other endangered areas, for example in the area between two successive printing units.

Die Bahnreißschalter 6 enthalten jeweils eine eine zugeordnete Bahnlängskante abtastende, aus Sender 8 und Empfänger 9 bestehende Lichtschranke, deren Elemente bezüglich der bei Normalbetrieb eingehaltenen Bahnebene einander gegenüberliegend, das heißt oberhalb und unterhalb der normalen Bahnebene, angeordnet sind. Im dargestellten Ausführungsbeispiel befinden sich jeweils der Sender 8 oberhalb der Bahnebene und der Empfänger 9 unterhalb der Bahnebene.The web break switches 6 each contain a light barrier, which consists of a transmitter 8 and a receiver 9, scanning an associated web longitudinal edge, the elements of which are arranged opposite one another with respect to the web level maintained during normal operation, that is to say above and below the normal web level. In the illustrated embodiment, the transmitter 8 is located above the web level and the receiver 9 below the web level.

Die in Figur 2 durch eine strichpunktierte Linie angedeutete, optische Achse 10 der Lichtschranken entspricht dem Strahlverlauf des Lichtstrahls zwischen Sender und zugeordnetem Empfänger. Bei Normalbetrieb, das heißt bei gespannter Papierbahn 1, wird die optische Achse 10 der Lichtschranken der im Bereich der Bahnlängskanten angeordneten Bahnreißschalter 6 von der jeweils zugeordneten Längskante der Bahn 1 geschnitten, wie aus Figur 2 anschaulich erkennbar ist. In diesem Fall wird der Lichtstrahl zwischen Sender 8 und Empfänger 9 durch die zwischen Sender 8 und Empfänger 9 eintauchende Längskante der Papierbahn 1 unterbrochen. Die den Sender 8 und den Empfänger 9 enthaltende Lichtschranke gibt dementsprechend kein Signal ab. Im Falle eines Bruchs der Papierbahn 1, das heißt bei wegfallendem Bahnzug, kann die in die Lichtschranke eintauchende Längskante der Papierbahn 1, wie in Figur 2 durch eine gestrichelte Linie angedeutet ist, gegenüber der normalen Bahnebene soweit ausgelenkt werden, daß die Verschneidung zwischen der optischen Achse 10 und der Papierbahn 1 und damit die Unterbrechung des Strahlwegs zwischen Sender 8 und Empfänger 9 entfällt. In einem derartigen Fall trifft der vom Sender 8 ausgesandte Lichtstrahl auf den Empfänger 9, wodurch dieser ein Signal erzeugt, das zum Aktivieren der Bahnfangvorrichtung 5 und zum Stoppen der Druckmaschine 2 verwendbar ist, wie in Figur 1 durch die Signalleitung 11 mit von den Bahnreißschaltern 6 abgehenden Eingängen 12 und zur Bahnfangvorrichtung 5 und zur Druckmaschine 2 führenden Ausgängen 13 angedeutet ist.The optical axis 10 of the light barriers indicated by a dash-dotted line in FIG. 2 corresponds to the beam path of the light beam between the transmitter and the assigned receiver. In normal operation, that is to say when the paper web 1 is tensioned, the optical axis 10 of the light barriers of the web break switches 6 arranged in the region of the web longitudinal edges is cut by the respectively assigned longitudinal edge of the web 1, as can be clearly seen from FIG. In this case, the light beam between the transmitter 8 and the receiver 9 is interrupted by the longitudinal edge of the paper web 1 immersed between the transmitter 8 and the receiver 9. The light barrier containing the transmitter 8 and the receiver 9 accordingly emits no signal. In the event of a break in the paper web 1, that is to say when the web train ceases to exist, the longitudinal edge of the paper web 1 which dips into the light barrier, as indicated by a dashed line in FIG. 2, can be deflected relative to the normal web plane to such an extent that the intersection between the optical Axis 10 and the paper web 1 and thus the interruption of the beam path between the transmitter 8 and the receiver 9 omitted. In such a case, the light beam emitted by the transmitter 8 strikes the receiver 9, as a result of which the receiver generates a signal which can be used to activate the web catching device 5 and to stop the printing press 2, as in FIG. 1 through the signal line 11 with the web break switches 6 outgoing inputs 12 and the web guiding device 5 and the printing machine 2 leading outputs 13 is indicated.

Um eine zuverlässige Auslenkung der in den Bereich zwischen Sender 8 und Empfänger 9 einer als Abtasteinrichtung fungierenden Lichtschranke eintauchenden Bahnlängskante zu gewährleisten, ist jeder Abtasteinrichtung, hier in Form einer Lichtschranke, eine Auslenkeinrichtung zugeordnet, die im dargestellten Ausführungsbeispiel einfach als im Bereich der zugeordneten Abtasteinrichtung auf die Oberseite der Längskante der Papierbahn 1 gerichtete Blasdüse 14 ausgebildet ist, die mit Druckluft beaufschlagbar ist. Hierzu sind die Blasdüsen an eine Druckluftquelle, hier in Form eines betriebsinternen Druckluftnetzes 15, angeschlossen, wie in Figur 1 durch Stichleitungen 16 angedeutet ist. Die Blasdüsen 14 sind im dargestellten Ausführungsbeispiel etwa lotrecht zur normalen Transportebene der Papierbahn 1 auf den in die Lichtschranke eingreifenden Bereich der Längskante der Papierbahn 1, hier auf den außerhalb der Verschneidungsstelle zwischen optischer Achse 10 und Papierbahn 1 liegenden Längskantenbereich, gerichtet.In order to ensure a reliable deflection of the longitudinal edge of the web that dips into the area between the transmitter 8 and the receiver 9 of a light barrier functioning as a scanning device, each scanning device, here in the form of a light barrier, is assigned a deflection device, which in the exemplary embodiment shown is simply as in the area of the assigned scanning device the top of the longitudinal edge of the paper web 1 directed blowing nozzle 14 is formed, which can be acted upon with compressed air. For this purpose, the blowing nozzles are connected to a compressed air source, here in the form of an internal compressed air network 15, as indicated in FIG. 1 by spur lines 16. In the exemplary embodiment shown, the blowing nozzles 14 are directed approximately perpendicular to the normal transport plane of the paper web 1 onto the region of the longitudinal edge of the paper web 1 which engages in the light barrier, here towards the longitudinal edge region lying outside the intersection between the optical axis 10 and the paper web 1.

Der mit Hilfe einer Blasdüse 4 erzeugbare Luftstrahl bzw. die hiervon bewirkte, auf die Bahnlängskante wirkende, durch den Pfeil 17 angedeutete Kraft sind so eingestellt, daß die Längskante der Papierbahn 1 bei vorhandenem Bahnzug, das heißt bei Normalbetrieb, nicht ausgelenkt wird. Bei Normalbetrieb wird dementsprechend die durch den Pfeil 17 angedeutete Kraft durch den Bahnzug überwunden. Erst wenn der Bahnzug infolge eines stattgefundenen Bahnrisses entfällt, bewirkt die Blasdüse 14 die in Figur 2 durch eine gestrichelte Linie angedeutete Auslenkung der zugeordneten Längskante der Papierbahn 1, wodurch der oben geschilderte Schaltvorgang bewirkt wird.The air jet that can be generated with the aid of a blowing nozzle 4 or the air jet that is caused thereby and acts on the longitudinal edge of the web. Force indicated by the arrow 17 are set so that the longitudinal edge of the paper web 1 is not deflected when the web is present, that is to say during normal operation. In normal operation, the force indicated by arrow 17 is accordingly overcome by the train. Only when the web tension is omitted as a result of a web break that has occurred does the blowing nozzle 14 cause the deflection of the associated longitudinal edge of the paper web 1, indicated by a broken line in FIG. 2, as a result of which the switching process described above is brought about.

Die senkrecht auf den Längskantenbereich der Papierbahn 1 gerichtete Blasdüse 14 bewirkt eine nach unten gerichtete Auslenkung des seitlichen Randbereichs der Papierbahn 1. Um sicherzustellen, daß die Papierbahn 1 mit ihrer ausgelenkten Randkante dabei zuverlässig aus dem Bereich zwischen Sender 8 und Empfänger 9, das heißt aus der Abtasteinrichtung, austaucht, ist die optische Achse 10 der hier die Abtasteinrichtung bildenden Lichtschranke parallel zu einer quer zur Längsrichtung der Papierbahn 1 verlaufenden Ebene angeordnet und gegenüber der normalen Transportebene der Papierbahn so geneigt, daß sie in Auslenkrichtung, das heißt hier von oben nach unten, nach außen verläuft. Der unterhalb der normalen Transportebene der Papierbahn 1 angeordnete Empfänger 9 der Lichtschranke ist dementsprechend gegenüber dem oberhalb der normalen Transportebene der Papierbahn 1 angeordneten Sender 8 nach außen versetzt. Im dargestellten Ausführungsbeispiel ist die optische Achse 10 unter einem spitzen Winkel von 45° gegenüber der normalen Papierbahnebene geneigt, was einen weiten Versatz zwischen Sender 8 und Empfänger 9 ermöglicht. Infolge der Neigung der optischen Achse 10 kann das unterhalb der Papierbahnebene angeordnete Element der Abtasteinrichtung, hier der Empfänger 9, auch ganz außerhalb der zu überwachenden Längskante der Papierbahn angeordnet sein, was eine ungehinderte Auslenkung des seitlichen Randbereichs der Papierbahn 1 ermöglicht, wie Figur 2 anschaulich erkennen läßt. Das obere, das heißt das in Auslenkrichtung hintere Element, hier der Sender 8, kann ohne weiteres innerhalb der Papierbahn 1 angeordnet sein.The blowing nozzle 14 directed perpendicularly to the longitudinal edge region of the paper web 1 brings about a downward deflection of the lateral edge region of the paper web 1. In order to ensure that the paper web 1 with its deflected edge edge thereby reliably leaves the region between the transmitter 8 and receiver 9, that is to say from the scanning device, the optical axis 10 of the light barrier forming the scanning device here is arranged parallel to a plane running transversely to the longitudinal direction of the paper web 1 and inclined relative to the normal transport plane of the paper web so that it is in the deflection direction, that is to say from top to bottom , runs outwards. The receiver 9 of the light barrier arranged below the normal transport plane of the paper web 1 is accordingly offset from the outside relative to the transmitter 8 arranged above the normal transport plane of the paper web 1. In the illustrated embodiment, the optical axis 10 is inclined at an acute angle of 45 ° with respect to the normal paper web plane, which is a wide offset between Transmitter 8 and receiver 9 enables. As a result of the inclination of the optical axis 10, the element of the scanning device, here the receiver 9, which is arranged below the plane of the paper web, can also be arranged completely outside the longitudinal edge of the paper web to be monitored, which enables an unimpeded deflection of the lateral edge region of the paper web 1, as shown in FIG. 2 reveals. The upper element, that is to say the rear element in the deflection direction, here the transmitter 8, can be arranged within the paper web 1 without further notice.

Anstelle einer Blasdüse könnte auch eine Saugdüse vorgesehen sein, durch die der zugeordnete Randbereich der Papierbahn 1 angesaugt wird, sobald dieser labil genug ist. Im dargestellten Ausführungsbeispiel mit nach unten gehender Auslenkrichtung müßte eine derartige Saugdüse unterhalb der normalen Papierbahnebene angeordnet sein. Ebenso wäre es denkbar, die als Abtasteinrichtung fungierende Lichtschranke etc. so anzuordnen, daß beim Normalbetrieb ein Dauersignal erzeugt wird, das im Falle einer Auslenkung der Papierbahn unterbrochen wird. Im dargestellten Ausführungsbeispiel müßte hierzu lediglich die optische Achse 10 um 90° verdreht und soweit nach außen gerückt sein, daß bei Normalbetrieb keine Kollision zwischen Achse 10 und Papierbahn 1 stattfindet.Instead of a blowing nozzle, a suction nozzle could also be provided, through which the associated edge region of the paper web 1 is sucked in as soon as it is unstable enough. In the illustrated embodiment with a downward deflection direction, such a suction nozzle would have to be arranged below the normal paper web plane. It would also be conceivable to arrange the light barrier, which acts as a scanning device, in such a way that a normal signal is generated during normal operation, which signal is interrupted in the event of a deflection of the paper web. In the exemplary embodiment shown, only the optical axis 10 would have to be rotated by 90 ° and moved outwards to such an extent that no collision between axis 10 and paper web 1 takes place during normal operation.

In Figur 2 sind zwei einander gegenüberliegende, bezüglich einer Bahn mit Längsebene symmetrisch angeordnete Bahnreißschalter 6 angedeutet. Hierdurch werden eine hohe Sicherheit und besonders kurze Totzeiten erreicht, da der Riß einer Papierbahn immer an einer Längskante beginnt und an der anderen Längskante endet. Sofern beide Längskanten überwacht werden, ist sichergestellt, daß bereits beim Beginn eines Anrisses der gewünschte Schaltvorgang erfolgt.In FIG. 2, two web break switches 6 which are opposite one another and are arranged symmetrically with respect to a web with a longitudinal plane are indicated. As a result, a high level of safety and particularly short dead times are achieved, since the tear of a paper web is always on one longitudinal edge begins and ends at the other longitudinal edge. If both longitudinal edges are monitored, it is ensured that the desired switching process takes place at the start of a crack.

Die dem oben beschriebenen Beispiel zugrundeliegende Lichtschranke zur Bildung der Abtasteinrichtung stellt ein besonders einfaches, kostengünstiges und robustes Bauelement dar. Selbstverständlich wäre es aber auch denkbar, zur Abtastung der Bahnlängskanten elektrische Schalter, zweckmäßig in Form sogenannter kapazitiver Schalter, vorzusehen. Auch hiermit ließe sich eine berührungslose Bahnabtastung erreichen.The light barrier on which the above-described example is based to form the scanning device represents a particularly simple, inexpensive and robust component. Of course, it would of course also be conceivable to provide electrical switches for scanning the longitudinal edges of the web, expediently in the form of so-called capacitive switches. This would also make it possible to achieve contactless path scanning.

Claims (10)

  1. A web break detector for web processing machines, more particularly web feed rotary printing presses, comprising at least one sensing means, associated with the web (1), preferably in the form of a photoelectric detecting means (8, 9 and 10) responsive to the web (1), by which in the case of an impermissible change in the position of the web a signal may be produced, characterized in that a deflection device (14) is associated with such at least one one sensing device (8, 9 and 10), which is arranged adjacent to a longitudinal edge of the web (1), and by means of such deflection device a deflection force (17) may be produced, which acts constantly in the zone of the associated longitudinal edge of the web (1) and during regular operation may be overcome by the web tension such deflection force being able to deflect the longitudinal edge of the web (1) if the web tension is reduced and is able to be moved in relation to the sensing device (8, 9 and 10).
  2. The web break detector as claimed in claim 1, characterized in that the deflection device comprises at least one air nozzle (14), which is connected with an air pressure difference producing device and is adapted for a flow-through direction pointing in the direction of deflection.
  3. The web break detector as claimed in claim 2, characterized in that the deflection device possesses at least one blowing nozzle (14) connected with a source (15) of compressed air and which is arranged opposite to the surface of the web (1) which is to the rear in the direction of deflection.
  4. The web break detector as claimed in any one of the preceding claims, characterized in that the sensing device (8, 9 and 10) is arranged with its axis (10) extending at a slope in relation to the direction of the force of the deflection device (14) and within a plane extending transversely in relation to the longitudinal direction of the web.
  5. The web break detector as claimed in claim 4, characterized in that the sensing device (8, 9 and 10) is arranged with its axis (10) intersecting the plane of the web at an acute angle of preferably 45°.
  6. The web break detector as claimed in any one of the preceding claims, characterized in that the deflection device (14) is arranged with a force direction generally perpendicular to the plane of the web.
  7. The web break detector as claimed in any one of the preceding claims 4 through 6, characterized in that the axis (10) of the sensing device (8, 9 and 10) swept by a longitudinal edge of the web (1) extends outward in the direction of deflection of the web (1).
  8. The web break detector as claimed in claim 7, characterized in that in the case of a two-part sensing device, preferably in the form of a photoelectric detecting means, with two elements, which are arranged on an axis (10) intersecting the plane of the web (1), and placed opposite to one another on either side of the web (1), and preferably in the form of a transmitter (8) and a receiver (9), the element (9), which is to the fore in the direction of deflection, is offset outward in relation to the element (8) which is to the rear in the direction of deflection.
  9. The web break detector as claimed in claim 8, characterized in that the element (9), which is to the fore in the direction of deflection, is arranged outside the associated longitudinal edge of the web (1) and the element (8), which is to the rear in the direction of deflection is arranged inside the same.
  10. The web break detector as claimed in any one of the claims 6 through 9, characterized in that the direction of the force of the deflection device (14) extends perpendicularly from above and in that the element (9), arranged underneath the normal web plane, of the sensing device (8, 9 and 10) is offset outward in relation to the upper element (8) thereof, preferably outside the longitudinal edge of the web.
EP90121858A 1989-11-28 1990-11-15 Web break switch Expired - Lifetime EP0429970B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3939226A DE3939226A1 (en) 1989-11-28 1989-11-28 RAIL RIP SWITCH
DE3939226 1989-11-28

Publications (3)

Publication Number Publication Date
EP0429970A2 EP0429970A2 (en) 1991-06-05
EP0429970A3 EP0429970A3 (en) 1991-09-11
EP0429970B1 true EP0429970B1 (en) 1994-10-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90121858A Expired - Lifetime EP0429970B1 (en) 1989-11-28 1990-11-15 Web break switch

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Country Link
US (1) US5130557A (en)
EP (1) EP0429970B1 (en)
JP (1) JP2884014B2 (en)
DE (2) DE3939226A1 (en)

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US4224824A (en) * 1978-03-24 1980-09-30 Giampiero Giusti Detecting device for breaks or tears and for the end of the strip in a strip of any material during its advance
JPS5882107A (en) * 1981-10-27 1983-05-17 ドウ・ラ・リユ・システムズ・リミテイド Method and device for detecting state of sheet
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DD255913A1 (en) * 1986-11-10 1988-04-20 Polygraph Leipzig SAFETY DEVICE FOR RESPONDING TO RAIL, INS. FOR ROLLER ROTATION OFFSET PRINTING MACHINES
US4891528A (en) * 1989-03-23 1990-01-02 Crosfield Ebway, Inc. Microprocessor-controlled apparatus for detecting and guiding a web wherein right and left eyespots are formed to determine right and left edges

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109250559A (en) * 2018-08-14 2019-01-22 安徽新网讯科技发展有限公司 A kind of strap production warning device of winding device
CN109250559B (en) * 2018-08-14 2020-05-19 安徽新网讯科技发展有限公司 Alarm device of winding equipment for packaging tape production

Also Published As

Publication number Publication date
JPH03180347A (en) 1991-08-06
EP0429970A2 (en) 1991-06-05
US5130557A (en) 1992-07-14
JP2884014B2 (en) 1999-04-19
EP0429970A3 (en) 1991-09-11
DE3939226A1 (en) 1991-05-29
DE59007504D1 (en) 1994-11-24

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