EP0142129B1 - Device for monitoring and controlling webs in packaging machines - Google Patents

Device for monitoring and controlling webs in packaging machines Download PDF

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Publication number
EP0142129B1
EP0142129B1 EP84113469A EP84113469A EP0142129B1 EP 0142129 B1 EP0142129 B1 EP 0142129B1 EP 84113469 A EP84113469 A EP 84113469A EP 84113469 A EP84113469 A EP 84113469A EP 0142129 B1 EP0142129 B1 EP 0142129B1
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EP
European Patent Office
Prior art keywords
web
housing
arrangement according
receivers
slit
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
Application number
EP84113469A
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German (de)
French (fr)
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EP0142129A3 (en
EP0142129A2 (en
Inventor
Heinz Focke
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Focke and Co GmbH and Co KG
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Focke and Co GmbH and Co KG
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Publication of EP0142129A2 publication Critical patent/EP0142129A2/en
Publication of EP0142129A3 publication Critical patent/EP0142129A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/0204—Sensing transverse register of web
    • B65H23/0216—Sensing transverse register of web with an element utilising photoelectric effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/02—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages
    • 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

Definitions

  • the invention relates to a device for monitoring and controlling webs of packaging material or the like.
  • the webs for the detection of material defects, such as cracks, material thickening or the like, are monitored with a first sensor and the relative position with a second sensor.
  • a first sensor is monitored with a first sensor and the relative position with a second sensor.
  • a second sensor is known from EP-A-43 723.
  • packaging material used which is delivered in rolls, has already been checked, it can always happen that either faulty batches are delivered or that web sections are damaged during transport or in the packaging machine. Packaging that consists of such damaged material must of course be discarded.
  • EP-A-43 723 a device which comprises two mutually independent detector stations: one for monitoring material defects, one for monitoring the registration of the web.
  • both detector units are linked to one another by a common control unit in such a way that in the event of an error signal either one of the detector units or the other detector unit is given a control signal to a differential speed control unit. Accordingly, the detector units do not trigger different control processes.
  • the detector unit to determine the Registerhaltigke i t extremely complicated, which occur especially when using transparent packaging material great difficulties in border surveillance.
  • a monitoring and control unit shown in the drawings is particularly suitable in connection with packaging machines, preferably cigarette packing machines.
  • a web 10 continuously running towards the packaging machine or a packaging unit (for example a film apparatus), for example made of a plastic film, is to be scanned in relation to the relative position, errors, etc.
  • the defects include irregularities in the material properties of the web 10 (holes, cracks, undesired thickening), but also transverse adhesive strips 11 for connecting the ends of successive webs 10.
  • the monitoring device consists of or is completely housed in a separate housing 12.
  • This unit which is approximately rectangular or cuboid in the present case, can be completely installed in or on the packaging machine and, if necessary, replaced.
  • the housing 12 forms a slot 13 which is eccentric here and is open at one edge. This gives the housing 12 an essentially U-shaped shape with legs 14 and 15 and a web 16 connecting them to one side.
  • the web 10 runs transversely to extend the housing 12 through the slot 13, preferably in the horizontal plane.
  • the monitoring elements namely optical or photoelectric sensors and display elements and the electronic and electrotechnical devices, are accommodated in the housing 12, which is formed with the slot 13 open on one side.
  • the main carrier of these organs is a U-shaped or with a slot 13 formed board 17. At the edge thereof, namely following the contours, a circumferential transverse wall 18 is formed. This also limits the slot 13 on both sides of the same.
  • top walls 19 are expediently attached, which are part of the closed housing 12.
  • the web 10 is scanned for any material defects by a first monitoring system, which consists of a Transmitter 20 on one side and a receiver 21 on the other side of slot 13 and thus web 10.
  • a test medium is emitted from the transmitter 20, preferably pulsating infrared light, which is received by the receiver 21 after passing through the web 10. Changes in the radiation or light intensity lead to a corresponding evaluation by evaluation electronics arranged downstream of the receiver 21 and possibly to the generation of an error signal.
  • the infrared light is guided in the area of the (upper and lower) transverse wall 18 through a respective plan window 22 and 23 inside the same.
  • An amplifier 24 is connected downstream of the receiver 21
  • a material strip is monitored independently of the web 10, namely a tear strip 25 which is attached (off-center) to the web 10.
  • a tear strip 25 is common in the outer wrapping of packaging, especially in the outer foil wrapping of cigarette packs.
  • the web 10 is provided with imaginary cross dividing lines 26, which are defined by blanks 27 to be separated from the web 10, each for a pack.
  • the tear strip 26 extends over the full length of the blanks 27 and thus over the web 10.
  • Pre-punched tabs 28 are marked at the ends for gripping the tear strip 25 when the packages are opened.
  • the presence and the exact position of the tear strip 25 is monitored by an independent system which consists of a common transmitter 29 and two receivers 30 and 31 which are arranged at a distance from one another.
  • the receivers 30 and 31 are arranged at a distance from one another (for example approx. 1 mm) which is somewhat smaller than the width of the tear strip 25. As a result, when the tear strip 25 is arranged in the normal position, both receivers 30, 31 are through it or covers the light beam. In the event of a deviation from the normal position, one or the other receiver 30, 31 is immediately exposed to infrared light, as a result of which an error signal is triggered and a correction movement with regard to the feeding of the tear strip 25 is initiated.
  • the two monitoring systems 20, 21 on the one hand and 29, 30, 31 on the other hand can be assigned optical display elements 33 and 34, which here protrude from the housing 12 in the region of an end wall 35 thereof. Any errors are made visible (in addition) by the display elements 33, 34.
  • the monitoring system with transmitter 29, receiver 30, and 31 fulfills a double function in the present case.
  • the tear strip 25 is provided with a (color) identifier 36, in the embodiment of FIG. 4 in the area of the grip tab 28.
  • This is used in the present device as an additional monitoring aid, specifically for the exact relative position of the Web 10 to be cut blank 27 with respect to the package to be wrapped (not shown).
  • the (color) identifier 36 is scanned by the transmitter 29 or the receiver 30, 31. The result is evaluated in such a way that, in the event of a determined difference in relation to the relative position, the conveying movement of the web 10 and thus the relative position of the blanks 27 are changed.
  • the sensitivity can be set differently depending on the monitoring target.
  • the connected actuating devices of the packaging machine can be set up and adjusted separately with regard to the speed, the size and the direction of the actuating values.
  • the transmitters generate the infrared light in cycles (2-5 kHz) in order to largely eliminate the influence of extraneous light.
  • the relative position of the organs can be selected so that the receivers 30, 31 are each half covered by the tear strip 25, that is to say deliver about half their possible output.
  • the output values are set in the case of a central tear strip 25 so that they are approximately the same and the output signals still do not report an error. (Threshold value setting depending on the permitted tolerance deviation in the lateral direction).
  • the signals can be evaluated in various ways. If one of the amplifiers 32 or both emits an error signal, this can be passed on to the output as an error via an AND link.
  • each amplifier 32 can emit a different signal, e.g. B. plus voltage on the one hand and minus voltage on the other hand. Both signals are given to a sum amplifier, the output of which is zero when the tear strip 25 is running properly.
  • the permissible deviation of the tear strip 25 from the zero position can be set by means of hysteresis, which can be adjusted with a potentiometer, according to plus and minus values at the output. At the same time, these plus and minus values can be used to readjust the position of the tear strip using a correction actuator.
  • the signals are derived here to separate out the incorrect packs or to stop the packaging machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Wrapping Of Specific Fragile Articles (AREA)
  • Making Paper Articles (AREA)

Description

Die Erfindung betrifft eine Einrichtung zur Überwachung und Steuerung von Bahnen aus Verpackungsmaterial oder dgl., wobei die Bahnen zur Erkennung von Materialfehlern, wie Rissen, Materialverdickungen oder dgl., mit einem ersten Sensor und die Relativstellung mit einem zweiten Sensor überwacht werden. Eine derartige Einrichtung ist aus der EP-A-43 723 bekannt.The invention relates to a device for monitoring and controlling webs of packaging material or the like. The webs for the detection of material defects, such as cracks, material thickening or the like, are monitored with a first sensor and the relative position with a second sensor. Such a device is known from EP-A-43 723.

Beim Herstellen von Verpackungen in Verpackungsmaschinen wird heutzutage mit sehr hohen Geschwindigkeiten gearbeitet. Obwohl das verwendete Verpackungsmaterial, das in Rollen angeliefert wird, bereits kontrolliert ist, kann es immer wieder vorkommen, das entweder fehlerhafte Chargen ausgeliefert werden oder aber auf dem Transport oder in der Verpackungsmaschine Bahnabschnitte beschädigt werden. Verpackungen, die aus derartig beschädigtem Material bestehen, müssen selbstverständlich ausgesondert werden.Nowadays, very high speeds are used to manufacture packaging in packaging machines. Although the packaging material used, which is delivered in rolls, has already been checked, it can always happen that either faulty batches are delivered or that web sections are damaged during transport or in the packaging machine. Packaging that consists of such damaged material must of course be discarded.

Bei der hohen Arbeitsgeschwindigkeit, die heute gefordert wird, ist es weiterhin unbedingt notwendig, die Lage der Bahn relativ zur Verpackungsmaschine exakt zu kontrollieren. Insbesondere dann, wenn das Verpackungsmaterial durchsichtig ist, bereitet dies große Schwierigkeiten, da bei der Überwachung eines (oder zweier) Bahnrandes (Bahnränder) eine von einem Sender detektierte Positionsabweichung entweder einen Materialfehler oder aber tatsächlich ein Wandern der Bahn zur Ursache haben kann.With the high speed of work that is required today, it is still absolutely necessary to precisely control the position of the web relative to the packaging machine. In particular, when the packaging material is transparent, this presents great difficulties, since in the monitoring of one (or two) web edge (web edges) a detected from a transmitter pos i tion deviation either a material or was in fact a walking of the web can have cause.

In der EP-A-43 723 wird eine Einrichtung vorgeschlagen, die zwei voneinander unabhängige Detektorstationen umfaßt : Eine zur Überwachung von Materialfehlern, eine zur Überwachung der Registerhaltigkeit der Bahn. Beide Detektoreinheiten sind jedoch durch eine gemeinsame Steuereinheit miteinander verknüpft dahingehend, daß bei einem Fehlersignal entweder der einen Detektoreinheit oder der anderen Detektoreinheit jeweils ein Steuersignal an eine Differenz-Geschwindigkeitssteuereinheit abgegeben wird. Dementsprechend lösen die Detektoreinheiten nicht unterschiedliche Steuervorgänge aus. Darüberhinaus ist die Detektoreinheit zur Feststellung der Registerhaltigkeit äußerst kompliziert, wobei insbesondere bei Verwendung von durchsichtigem Verpackungsmaterial große Schwierigkeiten bei der Randüberwachung auftreten.In EP-A-43 723 a device is proposed which comprises two mutually independent detector stations: one for monitoring material defects, one for monitoring the registration of the web. However, both detector units are linked to one another by a common control unit in such a way that in the event of an error signal either one of the detector units or the other detector unit is given a control signal to a differential speed control unit. Accordingly, the detector units do not trigger different control processes. Moreover, the detector unit to determine the Registerhaltigke i t extremely complicated, which occur especially when using transparent packaging material great difficulties in border surveillance.

Ausgehend von diesem Stand der Technik ist es Aufgabe der vorliegenden Erfindung, eine Einrichtung der eingangs genannten Art dahingehend weiterzubilden, daß neben der Überwachung von Materialfehlern eine exakte Lageermittlung der Bahn mit einfachen Mitteln durchführbar ist.Starting from this prior art, it is an object of the present invention to further develop a device of the type mentioned in the introduction such that, in addition to monitoring material defects, an exact position determination of the web can be carried out with simple means.

Diese Aufgabe wird in überraschend einfacher Weise durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst..This object is achieved in a surprisingly simple manner by the characterizing features of patent claim 1.

Dadurch nämlich, daß man einen ohnehin notwendigen Materialstreifen, also nicht die gesamte Bahn, überwacht, ist es möglich, mit einer einfachen Sensoranordnung ein exaktes Signal zu generieren, daß der Lage der Bahn entspricht.By monitoring an already necessary strip of material, ie not the entire web, it is possible to generate an exact signal with a simple sensor arrangement that corresponds to the position of the web.

Vorteilhafte Details der Erfindung sind in den Unteransprüchen beschrieben.Advantageous details of the invention are described in the subclaims.

Nachstehend werden Ausführungsbeispiele der Erfindung anhand der beigefügten Zeichnung näher erläutert. Es zeigen :

  • Figur 1 eine Einrichtung zur Überwachung von Bahnen in Seitenansicht mit schematisch dargestellten Überwachungsorganen,
  • Figur 2 die Einrichtung gemäß Fig. in Stirnansicht mit Bahn in verkleinertem Maßstab,
  • Figur 3 einen Grundriß zu Fig. 2, und
  • Figur 4 eine Darstellung entsprechend Fig. 3 eines anderen Ausführungsbeispiels.
Exemplary embodiments of the invention are explained in more detail below with reference to the attached drawing. Show it :
  • FIG. 1 shows a device for monitoring webs in a side view with schematically represented monitoring elements,
  • FIG. 2 shows the device according to FIG. 1 in a front view with the web on a reduced scale,
  • Figure 3 is a plan of Fig. 2, and
  • Figure 4 is an illustration corresponding to Fig. 3 of another embodiment.

Das in den Zeichnungen dargestellte Ausführungsbeispiel einer Überwachungs- und SteuerEinheit ist besonders geeignet in Verbindung mit Verpackungsmaschinen, vorzugsweise Zigarettenpackmaschinen. Eine fortlaufend der Verpackungsmaschine bzw. einem Verpackungsaggregat (z. B. Folienapparat) zulaufende Bahn 10, beispielsweise aus einer Kunststoff-Folie, ist in bezug auf Relativstellung, Fehler etc. abzutasten. Zu den Fehlern gehören Unregelmäßigkeiten in der Materialbeschaffenheit der Bahn 10 (Löcher, Risse, unerwünschte Verdickungen), aber auch querlaufende Klebestreifen 11 zum Verbinden der Enden aufeinanderfolgender Bahnen 10.The embodiment of a monitoring and control unit shown in the drawings is particularly suitable in connection with packaging machines, preferably cigarette packing machines. A web 10 continuously running towards the packaging machine or a packaging unit (for example a film apparatus), for example made of a plastic film, is to be scanned in relation to the relative position, errors, etc. The defects include irregularities in the material properties of the web 10 (holes, cracks, undesired thickening), but also transverse adhesive strips 11 for connecting the ends of successive webs 10.

Die Überwachungs-Einrichtung besteht aus bzw. ist in einem separaten Gehäuse 12 komplett untergebracht. Diese im vorliegenden Fall etwa rechteckige bzw. quaderförmige Einheit kann komplett in bzw. an der Verpackungsmaschine installiert und erforderlichenfalls ausgewechselt werden.The monitoring device consists of or is completely housed in a separate housing 12. This unit, which is approximately rectangular or cuboid in the present case, can be completely installed in or on the packaging machine and, if necessary, replaced.

Das Gehäuse 12 bildet einen hier außermittig liegenden, an einem Rand offenen Schlitz 13. Durch diesen erhält das Gehäuse 12 eine im wesentlichen U-förmige Gestalt mit Schenkeln 14 und 15 und einem diese an einer Seite miteinander verbindenden Steg 16. Die Bahn 10 läuft quer zur Längerstreckung des Gehäuses 12 durch den Schlitz 13 hindurch, vorzugsweise in horizontaler Ebene. In dem U-förmigen bzw. mit dem einseitig offenen Schlitz 13 ausgebildeten Gehäuse 12 sind die Überwachungsorgane, nämlich optische bzw. photoelektrische Sensoren sowie Anzeigeorgane und die elektronischen sowie elektrotechnischen Einrichtungen untergebracht. Hauptträger dieser Organe ist eine U-förmig bzw. mit einem Schlitz 13 ausgebildete Platine 17. Am Rand derselben, nämlich den Konturen folgend, ist eine ringsherumlaufende Querwand 18 gebildet. Diese begrenzt auch den Schlitz 13 zu beiden Seiten desselben. Außen sind zweckmäßigerweise Deckwandungen 19 angebracht, die Teil des geschlossenen Gehäuses 12 sind.The housing 12 forms a slot 13 which is eccentric here and is open at one edge. This gives the housing 12 an essentially U-shaped shape with legs 14 and 15 and a web 16 connecting them to one side. The web 10 runs transversely to extend the housing 12 through the slot 13, preferably in the horizontal plane. The monitoring elements, namely optical or photoelectric sensors and display elements and the electronic and electrotechnical devices, are accommodated in the housing 12, which is formed with the slot 13 open on one side. The main carrier of these organs is a U-shaped or with a slot 13 formed board 17. At the edge thereof, namely following the contours, a circumferential transverse wall 18 is formed. This also limits the slot 13 on both sides of the same. On the outside, top walls 19 are expediently attached, which are part of the closed housing 12.

Bei den hier gezeigten, bevorzugten Ausführungsbeispielen wird die Bahn 10 hinsichtlich etwaiger Materialfehler durch ein erstes Überwachungssystem abgetastet, welches aus einem Sender 20 auf der einen und einem Empfänger 21 auf der anderen Seite des Schlitzes 13 und damit der Bahn 10 besteht. Von dem Sender 20 wird ein Prüfmedium ausgesendet, vorzugsweise pulsierendes Infrarotlicht, welches nach Durchtritt durch die Bahn 10 von dem Empfänger 21 aufgenommen wird. Veränderungen der Strahlungs- bzw. Lichtintensität führen zu einer entsprechenden Auswertung durch eine dem Empfänger 21 nachgeordnete Auswertungselektronik und ggf. zur Erzeugung eines Fehlersignals. Das Infrarotlicht wird im Bereich der (oberen und unteren) Querwand 18 durch jeweils ein Planfenster 22 und 23 innerhalb derselben hindurchgeleitet. Dem Empfänger 21 ist ein Verstärker 24 nachgeschaltetIn the preferred exemplary embodiments shown here, the web 10 is scanned for any material defects by a first monitoring system, which consists of a Transmitter 20 on one side and a receiver 21 on the other side of slot 13 and thus web 10. A test medium is emitted from the transmitter 20, preferably pulsating infrared light, which is received by the receiver 21 after passing through the web 10. Changes in the radiation or light intensity lead to a corresponding evaluation by evaluation electronics arranged downstream of the receiver 21 and possibly to the generation of an error signal. The infrared light is guided in the area of the (upper and lower) transverse wall 18 through a respective plan window 22 and 23 inside the same. An amplifier 24 is connected downstream of the receiver 21

Bei dem. vorliegenden Ausführungsbeispiel wird unabhängig von der Bahn 10 ein Materialstreifen überwacht, nämlich ein Aufreißstreifen 25, der (außermittig) auf der Bahn 10 angebracht ist. Ein derartiger Aufreißstreifen 25 ist bei Außenumhüllungen von Verpackungen üblich, insbesondere bei der äußeren Folienumhüllung von Zigaretten-Packungen. Die Bahn 10 ist zur Verdeutlichung bei den Darstellungen in Fig. 3 und 4 mit gedachten Quertrennlinien 26 versehen, die durch später von der Bahn 10 abzutrennende Zuschnitte 27, je für eine Packung, definiert sind. Der Aufreißstreifen 26 erstreckt sich über die volle Länge der Zuschnitte 27 und damit über die Bahn 10. An den Enden sind jeweils vorgestanzte Grifflaschen 28 zum Erfassen des Aufreißstreifens 25 beim Öffnen der Packungen markiert.In which. In the present exemplary embodiment, a material strip is monitored independently of the web 10, namely a tear strip 25 which is attached (off-center) to the web 10. Such a tear strip 25 is common in the outer wrapping of packaging, especially in the outer foil wrapping of cigarette packs. 3 and 4, the web 10 is provided with imaginary cross dividing lines 26, which are defined by blanks 27 to be separated from the web 10, each for a pack. The tear strip 26 extends over the full length of the blanks 27 and thus over the web 10. Pre-punched tabs 28 are marked at the ends for gripping the tear strip 25 when the packages are opened.

Das Vorhandensein sowie die exakte Reiativla-" ge des Aufreißstreifens 25 wird bei dem gezeigten Ausführungsbeispiel durch ein unabhängiges System überwacht, welches aus einem gemeinsamen Sender 29 und zwei im Abstand voneinander angeordneten Empfängern 30 und 31 besteht. Letzteren sind jeweils Verstärker 32 nachgeordnet.In the exemplary embodiment shown, the presence and the exact position of the tear strip 25 is monitored by an independent system which consists of a common transmitter 29 and two receivers 30 and 31 which are arranged at a distance from one another.

Die Empfänger 30 und 31 sind in einem Abstand voneinander angeordnet (z. B. ca. 1 mm), der etwas kleiner ist als die Breite des Aufreißstreifens 25. Dadurch sind bei Anordnung des Aufreißstreifens 25 in der Normalstellung beide Empfänger 30, 31 durch diesen bzw. das Lichtstrahlenbündel überdeckt. Bei einer Abweichung von der Normalstellung wird der eine oder andere Empfänger 30, 31 unmittelbar mit Infrarotlicht beaufschlagt, wodurch ein Fehlersignal ausgelöst und eine Korrekturbewegung hinsichtlich der Zuführung des Aufreißstreifens 25 eingeleitet wird.The receivers 30 and 31 are arranged at a distance from one another (for example approx. 1 mm) which is somewhat smaller than the width of the tear strip 25. As a result, when the tear strip 25 is arranged in the normal position, both receivers 30, 31 are through it or covers the light beam. In the event of a deviation from the normal position, one or the other receiver 30, 31 is immediately exposed to infrared light, as a result of which an error signal is triggered and a correction movement with regard to the feeding of the tear strip 25 is initiated.

Den beiden Überwachungssystemen 20, 21 einerseits sowie 29, 30, 31 andererseits können optische Anzeigeorgane 33 und 34 zugeordnet sein, die hier im Bereich einer Stirnwand 35 des Gehäuses 12 aus diesem herausragen. Durch die Anzeigeorgane 33. 34 wird (zusätzlich) ein etwaiger Fehler sichtbar gemacht.The two monitoring systems 20, 21 on the one hand and 29, 30, 31 on the other hand can be assigned optical display elements 33 and 34, which here protrude from the housing 12 in the region of an end wall 35 thereof. Any errors are made visible (in addition) by the display elements 33, 34.

Das Überwachungssystem mit Sender 29, Empfänger 30, und 31 erfüllt im vorliegenden Falle eine Doppelfunktion. Der Aufreißstreifen 25 ist zu diesem Zweck mit einem (Farb-) Kennzeichen 36 versehen, bei dem Ausführungsbeispiel der Fig. 4 im Bereich der Grifflasche 28. Dieses wird bei der vorliegenden Einrichtung als zusätzliches Überwachungshilfsmittel herangezogen, und zwar für die exakte Relativstellung des von der Bahn 10 abzutrennenden Zuschnitts 27 in bezug auf die einzuhüllende Packung (nicht gezeigt). Zu diesem Zweck wird das (Farb-) Kennzeichen 36 durch den Sender 29 bzw. die Empfänger 30, 31 abgetastet. Das Ergebnis wird dahingehend ausgewertet, daß im Falle einer festgestellten Differenz in bezug auf die Relativlage die Förderbewegung der Bahn 10 und damit die Relativstellung der Zuschnitte 27 verändert wird.The monitoring system with transmitter 29, receiver 30, and 31 fulfills a double function in the present case. For this purpose, the tear strip 25 is provided with a (color) identifier 36, in the embodiment of FIG. 4 in the area of the grip tab 28. This is used in the present device as an additional monitoring aid, specifically for the exact relative position of the Web 10 to be cut blank 27 with respect to the package to be wrapped (not shown). For this purpose, the (color) identifier 36 is scanned by the transmitter 29 or the receiver 30, 31. The result is evaluated in such a way that, in the event of a determined difference in relation to the relative position, the conveying movement of the web 10 and thus the relative position of the blanks 27 are changed.

Durch die Trennung der Überwachungssysteme voneinander ist eine unterschiedliche Einstellung der Empfindlichkeit derselben je nach dem Überwachungsziel möglich. Des weiteren können die angeschlossenen Stelleinrichtungen der Verpakkungsmaschine hinsichtlich der Schnelligkeit, der Größe und Richtung der Stellwerte getrennt eingerichtet und justiert werden.By separating the monitoring systems from one another, the sensitivity can be set differently depending on the monitoring target. Furthermore, the connected actuating devices of the packaging machine can be set up and adjusted separately with regard to the speed, the size and the direction of the actuating values.

Das Infrarotlicht wird taktweise von den Sendern erzeugt (2-5 kHz), um Fremdlichteinflüsse weitgehend auszuschalten. Bei der Abtastung des Aufreißstreifens 25 kann die Relativstellung der Organe so gewählt werden, daß die Empfänger 30, 31 je zur Hälfte durch den Aufreißstreifen 25 überdeckt sind, also etwa ihre halbe mögliche Leistung liefern. Durch die jedem Empfänger 30, 31 nachgeschalteten, getrennten Verstärker 32 werden bei mittig verlaufendem Aufreißstreifen 25 die Ausgangswerte so eingestellt, daß sie annähernd gleich sind und die Ausgangssignale noch keinen Fehler melden. (Schwellenwert-Einstellung je nach zugelasssener Toleranzabweichung in seitlicher Richtung).The transmitters generate the infrared light in cycles (2-5 kHz) in order to largely eliminate the influence of extraneous light. When scanning the tear strip 25, the relative position of the organs can be selected so that the receivers 30, 31 are each half covered by the tear strip 25, that is to say deliver about half their possible output. With the separate amplifiers 32 connected downstream of each receiver 30, 31, the output values are set in the case of a central tear strip 25 so that they are approximately the same and the output signals still do not report an error. (Threshold value setting depending on the permitted tolerance deviation in the lateral direction).

Die Auswertung der Signale kann bei dieser Anordnung in verschiedener Weise erfolgen. Wenn einer der Verstärker 32 oder beide ein Fehlersignal abgeben, kann dieses über eine UND-Verknüpfung an den Ausgang als Fehler weitergegeben werden. Alternativ kann jeder Verstärker 32 ein unterschiedliches Signal abgeben, z. B. Plus-Spannung einerseits und Minus-Spannung andererseits. Beide Signale werden auf einen Summenverstärker gegeben, dessen Ausgang bei ordnungsgemäß laufendem Aufreißstreifen 25 Null ist. Durch mit Potentiometer einstellbare Hysteresen nach Plus- und Minuswerten am Ausgang kann die zulässige abweichung des Aufreißstreifens 25 aus der Null-Lage eingestellt werden. Zugleich können diese Plus- und Minuswerte dazu dienen, über ein Korrekturstellglied die Lage des Aufreißstreifens wieder zu justieren. Des weiteren werden hier die Signale abgeleitet, um die Fehlpackungen auszusondern bzw. die Verpackungsmaschine anzuhalten.With this arrangement, the signals can be evaluated in various ways. If one of the amplifiers 32 or both emits an error signal, this can be passed on to the output as an error via an AND link. Alternatively, each amplifier 32 can emit a different signal, e.g. B. plus voltage on the one hand and minus voltage on the other hand. Both signals are given to a sum amplifier, the output of which is zero when the tear strip 25 is running properly. The permissible deviation of the tear strip 25 from the zero position can be set by means of hysteresis, which can be adjusted with a potentiometer, according to plus and minus values at the output. At the same time, these plus and minus values can be used to readjust the position of the tear strip using a correction actuator. Furthermore, the signals are derived here to separate out the incorrect packs or to stop the packaging machine.

Claims (8)

1. Arrangement for monitoring and controlling webs (10) of packaging material or the like, the webs (10) being monitored for the detection of material defects, such as tears, thickenings of material or the like, by means of a first sensor (20, 21) and the relative position of the web (10) being monitored by means of a second sensor (29, 30, 31), characterised in that the sensor (29, 30, 31) for monitoring the relative position of the web (10) senses open strip (25), applied to the web (10) and comprises a transmitter (29) and two receivers (30, 31) arranged at a distance from one another on the opposite side of the web (10), and the distance between the receivers (30, 31) is less than the width of the strip of material, especially tear-open strip (25), so that a positional defect of the web (10) can be determined from the output signal of these sensors.
2. Arrangement according to Claim 1, characterised in that a (coloured) distinguishing mark (36) is made on the tear-open strip (25) for the sensing of the latter.
3. Arrangement according to Claim 1 or 2, characterised in that the receivers (21, 30, 31) of both the first and the second sensor respond to a change of light intensity, especially of pulsating infrared light.
4. Arrangement according to one of Claims 1 to 3, characterised in that all the transmitters (20, 29) and receivers -(21, 30, 31) are arranged on a common holder, especially in a common housing (12), which is made approximately U-shaped by means of a continuous slit (13) open on one side and extending in a longitudinal direction, and the web (10) can be conveyed through between housing legs (14, 15) in the region of the slit (13).
5. Arrangement according to Claim 4, characterised in that the transmitters (20, 29) of both the first and the second sensor are respectively arranged on one side of the slit (13), especially in the region of the upper housing leg (14), and the receivers (21, 30, 31) assigned to the transmitters (20, 29) are respectively arranged in the region of the other housing leg (15).
6. Arrangement according to Claim 4 or 5, characterised in that the transmitters (20, 29) and receivers (21, 30, 31) and further electrical or electronic switching and control members are arranged on a U-shaped board (17) within the housing (12), the board (17) being provided with the slit (13) according to the shape of the housing (12).
7. Arrangement according to one of Claims 4 to 6, characterised in that optical indicator members (33, 34) for indicating error signals as a result of the sensing carried out by the two sensors (20, 21. 29, 30, 31) are arranged on the outside of the housing (12), especially on a narrow end wall (35).
8. Arrangement according to one of Claims 4 to 7, characterised in that plane windows (22, 23) are arranged on both sides of the slit (13) in the region of the exit and entry of the infrared light, especially in a transverse wall (18) limiting the slit (13).
EP84113469A 1983-11-17 1984-11-08 Device for monitoring and controlling webs in packaging machines Expired EP0142129B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833341539 DE3341539A1 (en) 1983-11-17 1983-11-17 DEVICE FOR MONITORING AND CONTROLLING RAILWAYS IN PACKAGING MACHINES
DE3341539 1983-11-17

Publications (3)

Publication Number Publication Date
EP0142129A2 EP0142129A2 (en) 1985-05-22
EP0142129A3 EP0142129A3 (en) 1985-07-03
EP0142129B1 true EP0142129B1 (en) 1988-09-28

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EP84113469A Expired EP0142129B1 (en) 1983-11-17 1984-11-08 Device for monitoring and controlling webs in packaging machines

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US (1) US4682038A (en)
EP (1) EP0142129B1 (en)
JP (1) JPS60123329A (en)
BR (1) BR8405859A (en)
CA (1) CA1253230A (en)
DE (2) DE3341539A1 (en)

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Also Published As

Publication number Publication date
CA1253230A (en) 1989-04-25
US4682038A (en) 1987-07-21
EP0142129A3 (en) 1985-07-03
EP0142129A2 (en) 1985-05-22
JPH0317706B2 (en) 1991-03-08
DE3341539A1 (en) 1985-05-30
BR8405859A (en) 1985-09-17
JPS60123329A (en) 1985-07-02
DE3474281D1 (en) 1988-11-03
DE3341539C2 (en) 1991-03-28

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