EP0146917B1 - Device for detecting the presence of material to be conveyed on the lateral area of a rotating carrier - Google Patents

Device for detecting the presence of material to be conveyed on the lateral area of a rotating carrier Download PDF

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Publication number
EP0146917B1
EP0146917B1 EP84115799A EP84115799A EP0146917B1 EP 0146917 B1 EP0146917 B1 EP 0146917B1 EP 84115799 A EP84115799 A EP 84115799A EP 84115799 A EP84115799 A EP 84115799A EP 0146917 B1 EP0146917 B1 EP 0146917B1
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EP
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Prior art keywords
optical
light
equipment according
conductors
receiver
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EP84115799A
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German (de)
French (fr)
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EP0146917A3 (en
EP0146917A2 (en
Inventor
Günther Stiefelmeyer
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Leuze Electronic GmbH and Co KG
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Leuze Electronic GmbH and Co KG
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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
    • B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
    • B65H43/08—Photoelectric devices

Definitions

  • the invention relates to a device for detecting the presence of goods to be transported on the outer surface of a rotating transport body with the aid of a light-electric unit containing a light transmitter and a light receiver, and a circuit arrangement for signal evaluation, the light transmitter and the light receiver being arranged in a stationary manner and the transmission of the light emitted by the light transmitter Beam of light to the light receiver takes place by means of light guides which open out at one end into the scanning zone of the rotating transport body and are led out at the other end in the axial direction from the transport body to the light receiver.
  • Such a device is known from FR-A-2 240 108.
  • the photoelectric monitoring device used here works with ambient light or with an additional, exposed external light source assigned to the cylinder jacket surface and accordingly with at least two one-way light barriers which have to be offset from one another in the circumferential direction of the cylinder.
  • the problem of the stationary arrangement of the light transmitter and the light receiver on one side, as is required in reflection light barriers with a light guide for the transmitted light beam and a light guide for the reflected light beam, both of which circulate with the transport body, does not occur in the device in question . Apart from this, due to the inevitable fluctuations in the light intensity in buildings and due to the influence of the light source by extraneous light, dust, etc., there is also a noticeable risk of impairing the signal evaluation.
  • DE-A-2 539 481 shows and describes a device for reflection scanning of markings for measuring and regulating on movable mechanical processes, in particular on rotary printing presses, in which at least one flexible optical fiber cable is used as the scanning element.
  • the light guide cable forms with its front end in the area of the web to be scanned a touch surface that can be set up for a signal point and is connected at its other end, which lies outside the web area, to a light transmitter and light receiver which is firmly attached to the machine housing.
  • the light guide cable or the light guide cables are mounted in a holder on a support part in the form of a rod running transversely to the direction of web movement and approximately parallel to the web plane. This rod is attached to the machine frame.
  • the photoelectric unit works on the reflection principle and the ends of the light guide serving to transmit the transmitted light beam and the reflected light beam are led out of the transport body in such a way that the end of the light channel embodying the transmitted light channel is centrally located in a bore in the stub shaft of the transport body is arranged and the end of the reflection light channel with the light guide is accommodated in a hole eccentrically to the central axis of the stub shaft, the stub shaft being rotatably mounted in a component containing the light transmitter and the light receiver and the end of a light guide with the light transmitter and the end of the other light guide interacts with the light receiver.
  • the goods to be transported 1 are in the form of a paper or web of fabric fed to the upper rotating body 2 and, after deflection, transferred to the lower body 3 and transported further by the latter.
  • the rotating bodies 2, 3 are designed here as hollow rollers.
  • the jacket 5 is provided with two openings 6, 7 designed as through bores, each of which receives the end 8 ', 9' of a light guide 8, 9.
  • the light guide ends are spatially defined and arranged in a fixed manner, optionally using a special receiving part attached to the inside of the jacket 5.
  • the end faces of the light guides for example in the form of glass fibers or glass fiber bundles, are exposed on the material web side, so that the emitted light beam can exit to the outside and, in the presence of transport goods, the reflected portion of the emitted light can penetrate unhindered into the associated light guide.
  • the light guide designated 8 is provided for the transmission of the beam of rays emanating from the light transmitter, the light guide 9 for the return of the reflected light portion to the receiver. It is readily possible to arrange a plurality of such scanning zones on the circumference of the hollow roller 2, which, if necessary, can also be spatially offset from one another in order, for example, to be able to detect inclined positions of the goods to be transported.
  • the light guide 8 is guided in the interior of the hollow roller 2 from the scanning point into a central bore 10 in the end face of the roller, which is embodied here by a flange 13 provided with a stub shaft 12.
  • the flange 13 containing the stub shaft is fastened by means of two screws 14 to the annular end face 15 of the hollow roller and is provided for this purpose with two circumferential longitudinal slots 16, which also allow the flange to be rotated, see also FIGS. 2 and 3 the light guide 9 is inserted into a further bore 17 in the flange 13, which runs axially parallel to the bore 10 and is arranged eccentrically to the latter.
  • the bore 17 is in the same plane as the bore 10; however, it could also be offset from the bore 10 by any angle.
  • the two flange-side end regions of the two light guides are fixed in the bores 10 and 17 by means of sleeves 30, 31.
  • the receiving bores 10 and 17 continue axially as tapered bore sections 10 'and 17' in the stub shaft 12 and receive the ends 8 "and 9" of the two light guides 8 and 9.
  • the light guide ends 8 ′′ and 9 ′′ extend so far forward in the bore sections 10 ′ and 17 ′ that their end faces are at least approximately flush with the end face 12 ′ of the stub shaft 12.
  • the stub shaft 12 is rotatably supported by a roller bearing 18 in a stationary component 19 in which the light transmitter 20 and the light receiver 21 are accommodated.
  • the optical coupling of the light transmitter 20 and the light receiver 21 with the light guide 8 and the light guide 9 takes place via the air gap 23 which is necessarily present between the end face 12 'of the stub shaft 12 and the end face 22 of the component 19 lying opposite it, which is for example of the order of 0 , 1 to 0.3 mm.
  • the light transmitter can be approximately flush with the end face 22 of the component 19, as can the light receiver.
  • continuation light channels 24, 25 are to be provided in the fixed component 19, which lead to the light transmitter and light receiver located correspondingly far within the component 19.
  • the continuation light channels can also be embodied by light guides.
  • the continuation light channel 24 can also extend partially into the bore 10 'of the shaft end 12, a relative movement between this section of the light guide 24 and the shaft end 12 having to be ensured, since the latter is rotating.
  • the evaluation circuit arrangement 26 can also be accommodated in the spatially fixed component 19. However, there is also the possibility of providing the evaluation circuit arrangement elsewhere in a control center or the like. Likewise, the light transmitter 20 and the light receiver 21 can also be installed at another location and can be coupled by means of light guides to the light guides 8 and 9 rotating with the hollow roller 2 in the manner described.
  • the device described works as follows: If the scanning zone 4 is covered by a transport item 1, for example a paper web, the bundle of light rays emitted by the light transmitter 20 and guided via the light guides 24 and 8 to the scanning zone 4 of the hollow roller 2 will depend on the paper web 1 the quality of which reflects to a greater or lesser extent and reaches the light guide 9, which reflects the reflected light back to the light receiver 21 via the stationary light guide 25 which interacts with it at a certain angle of rotation.
  • the relay 27 controlled by the evaluation switching arrangement 26 does not respond in this case and the system remains in the ready state, which can be identified by an optical signal if necessary. If there is no signal at the scheduled time due to the lack of reflected light radiation because there is no transport goods in the area of the scanning zone 4, the relay 27 responds and expediently shuts down the system with simultaneous optical and / or acoustic signaling.
  • the system can conversely continue to operate if the reflected light beam is not present stay and only be switched off when there is a transport good.
  • the ends 8 'and 9' of the two light guides 8 and 9 lying in the scanning zone 4 can also be arranged coaxially to one another.
  • the two ends of the said light guides are coaxially combined in a sleeve 28 and optically shielded from one another by means of an intermediate layer 29.
  • the angular position of the light guide end 9 '' relative to the stationary light guide 25 (FIGS. 3 and 4) can be changed and thus the reflection light channel can be activated at another angular position which is deemed necessary or expedient.

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  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Description

Die Erfindung betrifft eine Einrichtung zum Erkennen des Vorhandenseins von Transportgut auf der Mantelfläche eines rotierenden Transportkörpers mit Hilfe einer einen Lichtsender und einen Lichtempfänger sowie eine Schaltungsanordnung zur Signalauswertung enthaltenden lichtelektrischen Einheit, wobei der Lichtsender und der Lichtempfänger stationär angeordnet sind und die Übertragung des vom Lichtsender abgestrahlten Lichtstrahlenbündels zum Lichtempfänger mittels Lichtleiter erfolgt, die mit ihrem einen Ende in die Abtastzone des rotierenden Transportkörpers frei ausmünden und mit ihrem anderen Ende in axialer Richtung aus dem Transportkörper zum Lichtempfänger herausgeführt sind.The invention relates to a device for detecting the presence of goods to be transported on the outer surface of a rotating transport body with the aid of a light-electric unit containing a light transmitter and a light receiver, and a circuit arrangement for signal evaluation, the light transmitter and the light receiver being arranged in a stationary manner and the transmission of the light emitted by the light transmitter Beam of light to the light receiver takes place by means of light guides which open out at one end into the scanning zone of the rotating transport body and are led out at the other end in the axial direction from the transport body to the light receiver.

Eine derartige Einrichtung ist durch die FR-A-2 240 108 bekannt. Die hierbei benutzte lichtelektrische Überwachungseinrichtung arbeitet mit Umgebungslicht bzw. mit einer zusätzlichen, der Zylindermantelfläche zugeordneten freiliegenden äußeren Lichtquelle und demgemäß mit wenigstens zwei Einweg-Lichtschranken, die in Umfangsrichtung des Zylinders gegeneinander versetzt sein müssen. Das Problem der stationären Anordnung des Lichtsenders und des Lichtempfängers auf einer Seite, wie es bei Reflexionslichtschranken mit einem Lichtleiter für das Sendelichtstrahlenbündel und einem Lichtleiter für das Reflexionslichtstrahlenbündel, die beide mit dem Transportkörper umlaufen, erforderlich ist, tritt bei der in Rede stehenden Einrichtung nicht auf. Abgesehen davon besteht hierbei wegen der unvermeidlichen Schwankungen der Lichtintensität in Gebäuden sowie infolge der Beeinflussung der Lichtquelle durch Fremdlicht, Verstaubung etc. auch die nennenswerte Gefahr einer Beeinträchtigung der Signalauswertung.Such a device is known from FR-A-2 240 108. The photoelectric monitoring device used here works with ambient light or with an additional, exposed external light source assigned to the cylinder jacket surface and accordingly with at least two one-way light barriers which have to be offset from one another in the circumferential direction of the cylinder. The problem of the stationary arrangement of the light transmitter and the light receiver on one side, as is required in reflection light barriers with a light guide for the transmitted light beam and a light guide for the reflected light beam, both of which circulate with the transport body, does not occur in the device in question . Apart from this, due to the inevitable fluctuations in the light intensity in buildings and due to the influence of the light source by extraneous light, dust, etc., there is also a noticeable risk of impairing the signal evaluation.

In der DE-A-2 539 481 ist eine Vorrichtung zur Reflexionsabtastung von Markierungen zum Messen und Regeln an beweglichen mechanischen Abläufen, insbesondere an Rotationsdruckmaschinen, dargestellt und beschrieben, bei der als Tastorgan mindestens ein flexibles Lichtleiterkabel verwendet wird. Das Lichtleiterkabel bildet dabei mit seinem im Bereich der abzutastenden Bahn liegenden Stirnende eine auf einen Signalpunkt einrichtbare Tastfläche und ist mit seinem anderen Ende, das außerhalb des Bahnbereichs liegt, mit einem Lichtgeber und Lichtempfänger verbunden, der fest am Maschinengehäuse angebracht ist. Das Lichtleiterkabel bzw. die Lichtleiterkabel sind in einem Halter an einem Trägerteil in Form einer quer zur Bahn-Bewegungsrichtung und etwa parallel zur Bahnebene verlaufenden Stange gelagert. Diese Stange ist am Maschinengestell befestigt.DE-A-2 539 481 shows and describes a device for reflection scanning of markings for measuring and regulating on movable mechanical processes, in particular on rotary printing presses, in which at least one flexible optical fiber cable is used as the scanning element. The light guide cable forms with its front end in the area of the web to be scanned a touch surface that can be set up for a signal point and is connected at its other end, which lies outside the web area, to a light transmitter and light receiver which is firmly attached to the machine housing. The light guide cable or the light guide cables are mounted in a holder on a support part in the form of a rod running transversely to the direction of web movement and approximately parallel to the web plane. This rod is attached to the machine frame.

Lichtempfänger und Lichtsender sowie die Tastorgane sind bei dieser Vorrichtung zur Reflexionsabtastung bezogen auf die durchlaufende Bahn ruhend angeordnet. Daher kann der Abtastvorgang während der Dauer einer Teilumdrehung eines rotierenden zylindrischen Körpers nicht aufrechterhalten werden. Voraussetzung für die Funktionsfähigkeit einer solchen Vorrichtung ist eine Relativbewegung der mit Markierungen versehenen Materialbahn zu den Tastorganen sowie eine Bewegung der Materialbahn zumindest in einer im wesentlichen senkrecht zur Fläche der Abtastorgane liegenden Ebene. Abgesehen davon ist eine derartige Reflexionsabtastung wegen der langen, frei liegenden Verbindungsleitungen insbesondere auch in mechanischer Hinsicht störanfällig.In this device for reflection scanning, light receivers and light transmitters as well as the sensing elements are arranged in a stationary manner in relation to the continuous path. Therefore, the scanning operation cannot be maintained for the duration of a partial revolution of a rotating cylindrical body. A prerequisite for the functionality of such a device is a relative movement of the material web provided with markings to the sensing elements and a movement of the material web at least in a plane lying essentially perpendicular to the surface of the scanning elements. Apart from this, such reflection scanning is particularly susceptible to faults in mechanical terms because of the long, exposed connecting lines.

Es ist Aufgabe der Erfindung, eine lichtelektrische Einrichtung der gattungsgemäßen Art zu schaffen, die während der Dauer der Anlage der Transportgutbahn am Transportkörper je Transportkörperumdrehung eine zuverlässige Signalauswertung bei einem hohen Wirkungsgrad gewährleistet, wobei der Aufwand nur sehr gering ist und Störeinflüsse weitestgehend ausgeschaltet sind.It is an object of the invention to provide a photoelectric device of the generic type, which ensures reliable signal evaluation with a high degree of efficiency for the duration of the transport web on the transport body per transport body revolution, the effort being very low and interference being largely eliminated.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß die lichtelektrische Einheit nach dem Reflexionsprinzip arbeitet und die Enden der zur Übertragung des Sendelichtstrahlenbündels und des Reflexionslichtstrahlenbündels dienenden Lichtleiter so aus dem Transportkörper herausgeführt sind, daß das Ende des den Sendelichtkanal mit verkörpernden Lichtleiters zentral in einer Bohrung im Wellenstumpf des Transportkörpers angeordnet ist und das Ende des den Reflexionslichtkanal mit verkörpernden Lichtleiters in einer exzentrisch zur Mittelachse des Wellenstumpfs liegenden Bohrung untergebracht ist, wobei der Wellenstumpf drehbar in einem den Lichtsender und den Lichtempfänger enthaltenden Bauteil gelagert ist und das Ende des einen Lichtleiters mit dem Lichtsender und das Ende des anderen Lichtleiters mit dem Lichtempfänger zusammenwirkt.This object is achieved in that the photoelectric unit works on the reflection principle and the ends of the light guide serving to transmit the transmitted light beam and the reflected light beam are led out of the transport body in such a way that the end of the light channel embodying the transmitted light channel is centrally located in a bore in the stub shaft of the transport body is arranged and the end of the reflection light channel with the light guide is accommodated in a hole eccentrically to the central axis of the stub shaft, the stub shaft being rotatably mounted in a component containing the light transmitter and the light receiver and the end of a light guide with the light transmitter and the end of the other light guide interacts with the light receiver.

Weiterbildungen und zweckmäßige Ausgestaltungen des Gegeustandes der Erfindung sind in den Unteransprüchen angegeben.Further developments and expedient refinements of the state of the invention are specified in the subclaims.

Der Gegeustand der wird im nachstehenden anhand der Zeichnung, die eine beispielsweise Ausführungsform der Einrichtung zum Erkennen des Transportguts auf der Mantelfläche einer Hohlwalze veranschaulicht, erläutert.The state of the is explained below with reference to the drawing, which illustrates an example embodiment of the device for recognizing the goods to be transported on the lateral surface of a hollow roller.

Es zeigen:

  • Fig. 1 eine perspektivische Ansicht eines zwei zylindrische Hohlwalzen als Transportkörper umfassenden Abschnitts einer Anlage zum Transport von Papierbahnen,
  • Fig. 2 einen Teillängsschnitt durch die in Fig. 1 oben dargestellte Hohlwalze mit der lichtelektrischen Einheit,
  • Fig. 3 eine Ansicht der Hohlwalze gemäß Fig. 2 in Richtung A-B,
  • Fig. 4 eine Ansicht der in Fig. 2 stationär angeordneten Einheit in Richtung C-D,
  • Fig. 5 die Abtastzone im Schnitt mit koaxial zueinanderliegenden Mündungen der beiden Lichtleiter.
Show it:
  • 1 is a perspective view of a section of a system for transporting paper webs comprising two cylindrical hollow rollers as the transport body,
  • 2 shows a partial longitudinal section through the hollow roller shown in FIG. 1 with the photoelectric unit,
  • 3 is a view of the hollow roller according to FIG. 2 in the direction AB,
  • 4 shows a view of the unit arranged in a stationary manner in FIG. 2 in the direction of CD,
  • Fig. 5 shows the scanning zone in section with coaxial mutually mouths of the two light guides.

Bei dem in Fig. 1 veranschaulichten Abschnitt einer Walzenstraße, wie sie im Prinzip beispielsweise Kalander oder Farbdruckwerke aufweisen, wird das Transportgut 1 in Form einer Papier-oder Gewebebahn dem oberen rotierenden Körper 2 zugeführt und nach Umlenkung dem unteren Körper 3 übergeben und von diesem weitertransportiert. Die rotierenden Körper 2, 3 sind hier als Hohlwalzen ausgebildet.In the section of a roller train illustrated in FIG. 1, as in principle they have, for example, calenders or color printing units, the goods to be transported 1 are in the form of a paper or web of fabric fed to the upper rotating body 2 and, after deflection, transferred to the lower body 3 and transported further by the latter. The rotating bodies 2, 3 are designed here as hollow rollers.

In der Abtastzone 4 der oberen Hohlwalze 2 ist deren Mantel 5 mit zwei als Durchgangsbohrungen ausgebildeten Durchbrechungen 6, 7 versehen, von denen jede das Ende 8', 9' eines Lichtleiters 8, 9 aufnimmt. Die Lichtleiterenden sind dabei räumlich definiert und fest angeordnet, gegebenenfalls unter Verwendung eines besonderen, an der Innenseite des Mantels 5 angebrachten Aufnahmeteils. Die Stirnflächen der beispielsweise als Glasfasern oder Glasfaserbündel ausgebildeten Lichtleiter liegen materialbahnseitig frei, so daß das ausgesandte Lichtstrahlenbündel nach außen austreten kann und der beim Vorhandensein von Transportgut von diesem reflektierte Anteil des ausgestrahlten Lichtes ungehindert in den diesem zugeordneten Lichtleiter eindringen kann. Beim Ausführungsbeispiel ist der mit 8 bezeichnete Lichtleiter für die Übertragung des vom Lichtsender ausgehenden Strahlenbündels vorgesehen, der Lichtleiter 9 für die Rückführung des reflektierten Lichtanteils zum Empfänger. Es ist ohne weiteres möglich, mehrere solche Abtastzonen am Umfang der Hohlwalze 2 anzuordnen, die erforderlichenfalls auch räumlich gegeneinander versetzt sein können, um beispielsweise auch Schräglagen des Transportgutes erfassen zu können.In the scanning zone 4 of the upper hollow roller 2, its jacket 5 is provided with two openings 6, 7 designed as through bores, each of which receives the end 8 ', 9' of a light guide 8, 9. The light guide ends are spatially defined and arranged in a fixed manner, optionally using a special receiving part attached to the inside of the jacket 5. The end faces of the light guides, for example in the form of glass fibers or glass fiber bundles, are exposed on the material web side, so that the emitted light beam can exit to the outside and, in the presence of transport goods, the reflected portion of the emitted light can penetrate unhindered into the associated light guide. In the exemplary embodiment, the light guide designated 8 is provided for the transmission of the beam of rays emanating from the light transmitter, the light guide 9 for the return of the reflected light portion to the receiver. It is readily possible to arrange a plurality of such scanning zones on the circumference of the hollow roller 2, which, if necessary, can also be spatially offset from one another in order, for example, to be able to detect inclined positions of the goods to be transported.

Der Lichtleiter 8 ist im Innenraum der Hohlwalze 2 von der Abtaststelle in eine zentrale Bohrung 10 in der Stirnseite der Walze geführt, die hier durch einen mit einem Wellenstumpf 12 versehenen Flansch 13 verkörpert ist. Der den Wellenstumpf enthaltene Flansch 13 ist dabei mittels zweier Schrauben 14 am kreisringförmigen Stirnseitenansatz 15 der Hohlwalze befestigt und zu diesem Zweck mit zwei in Umfangsrichtung verlaufenden Längsschlitzen 16 versehen, die auch ein Verdrehen des Flansches ermöglichen, vergleiche hierzu auch die Figuren 2 und 3. Desgleichen ist der Lichtleiter 9 in eine weitere Bohrung 17 im Flansch 13 eingeführt, die achsparallel zur Bohrung 10 verläuft und exzentrisch zu dieser angeordnet ist. Darüber hinaus liegt die Bohrung 17 in derselben Ebene wie die Bohrung 10; sie könnte indesssen auch um einen beliebigen Winkel gegen die Bohrung 10 versetzt sein.The light guide 8 is guided in the interior of the hollow roller 2 from the scanning point into a central bore 10 in the end face of the roller, which is embodied here by a flange 13 provided with a stub shaft 12. The flange 13 containing the stub shaft is fastened by means of two screws 14 to the annular end face 15 of the hollow roller and is provided for this purpose with two circumferential longitudinal slots 16, which also allow the flange to be rotated, see also FIGS. 2 and 3 the light guide 9 is inserted into a further bore 17 in the flange 13, which runs axially parallel to the bore 10 and is arranged eccentrically to the latter. In addition, the bore 17 is in the same plane as the bore 10; however, it could also be offset from the bore 10 by any angle.

Wie insbesondere aus Fig. 2 ersichtlich ist, sind die beiden flanschseitigen Endbereiche der beiden Lichtleiter mittels Hülsen 30, 31 in den Bohrungen 10 und 17 fixiert. Die Aufnahmebohrungen 10 und 17 setzen sich als im Durchmesser verjüngte Bohrungsabschnitte 10' und 17' im Wellenstumpf 12 axial fort und nehmen die Enden 8" und 9" der beiden Lichtleiter 8 und 9 auf. Die Lichtleiterenden 8" und 9" erstrecken sich in den Bohrungsabschnitten 10' und 17' soweit nach vorne, daß ihre Stirnflächen wenigstens angenähert bündig sind mit der Stirnfläche 12' des Wellenstumpfs 12.As can be seen in particular from FIG. 2, the two flange-side end regions of the two light guides are fixed in the bores 10 and 17 by means of sleeves 30, 31. The receiving bores 10 and 17 continue axially as tapered bore sections 10 'and 17' in the stub shaft 12 and receive the ends 8 "and 9" of the two light guides 8 and 9. The light guide ends 8 ″ and 9 ″ extend so far forward in the bore sections 10 ′ and 17 ′ that their end faces are at least approximately flush with the end face 12 ′ of the stub shaft 12.

Der Wellenstumpf 12 ist mittels eines Wälzlagers 18 drehbar in einem stationären Bauteil 19 gelagert, in dem der Lichtsender 20 und der Lichtempfänger 21 untergebracht sind. Die optische Kopplung des Lichtsenders 20 und des Lichtempfängers 21 mit dem Lichtleiter 8 und dem Lichtleiter 9 erfolgt über den zwischen der Stirnfläche 12' des Wellenstumpfes 12 und der dieser gegenüberliegenden Stirnfläche 22 des Bauteils 19 notwendigerweise vorhandenen Luftspalt 23, der beispielsweise in der Größenordnung von 0,1 bis 0,3 mm liegt. Dabei kann der Lichtsender etwa bündig mit der Stirnfläche 22 des Bauteiles 19 abschließen, desgleichen der Lichtempfänger. Im andern Fall sind im feststehenden Bauteil 19 Fortsetzungslichtkanäle 24, 25 vorzusehen, die zum entsprechend weit innerhalb des Bauteiles 19 liegenden Lichtsender und Lichtempfänger führen. Die Fortsetzungslichtkanäle können dabei ebenfalls durch Lichtleiter verkörpert sein. Im Falle des zentral liegenden Lichtleiterendes 8" kann sich der Fortsetzungslichtkanal 24 auch noch zum Teil in die Bohrung 10' des Wellenstumpfes 12 hineinerstrecken, wobei eine Relativbewegung zwischen diesem Teilstück des Lichtleiters 24 und dem Wellenstumpf 12 gewährleistet sein muß, da der letztere ja rotiert.The stub shaft 12 is rotatably supported by a roller bearing 18 in a stationary component 19 in which the light transmitter 20 and the light receiver 21 are accommodated. The optical coupling of the light transmitter 20 and the light receiver 21 with the light guide 8 and the light guide 9 takes place via the air gap 23 which is necessarily present between the end face 12 'of the stub shaft 12 and the end face 22 of the component 19 lying opposite it, which is for example of the order of 0 , 1 to 0.3 mm. The light transmitter can be approximately flush with the end face 22 of the component 19, as can the light receiver. In the other case, continuation light channels 24, 25 are to be provided in the fixed component 19, which lead to the light transmitter and light receiver located correspondingly far within the component 19. The continuation light channels can also be embodied by light guides. In the case of the centrally located light guide end 8 ", the continuation light channel 24 can also extend partially into the bore 10 'of the shaft end 12, a relative movement between this section of the light guide 24 and the shaft end 12 having to be ensured, since the latter is rotating.

Im räumlich fest angeordneten Bauteil 19 kann auch die Auswerteschaltungsanordnung 26 untergebracht sein. Es besteht jedoch auch die Möglichkeit, die Auswerteschaltungsanordnung andernorts in einer Schaltzentrale oder dgl. vorzusehen. Ebensogut können auch der Lichtsender 20 und der Lichtempfänger 21 an einem anderen Ort installiert sein und mittels Lichtleiter an die mit der Hohlwalze 2 umlaufenden Lichtleiter 8 und 9 in der beschriebenen Weise angekoppelt sein.The evaluation circuit arrangement 26 can also be accommodated in the spatially fixed component 19. However, there is also the possibility of providing the evaluation circuit arrangement elsewhere in a control center or the like. Likewise, the light transmitter 20 and the light receiver 21 can also be installed at another location and can be coupled by means of light guides to the light guides 8 and 9 rotating with the hollow roller 2 in the manner described.

Die beschriebene Einrichtung arbeitet wie folgt: Wird die Abtastzone 4 von einem Transportgut 1, beispielsweise einer Papierbahn, überdeckt, so wird das von Lichtsender 20 emittierte und über die Lichtleiter 24 und 8 zur Abtastzone 4 der Hohlwalze 2 geleitete Lichtstrahlenbündel von der Papierbahn 1 je nach deren Beschaffenheit zu einem größeren oder kleineren Teil reflektiert und gelangt in den Lichtleiter 9, der das reflektierte Licht über den mit ihm zu einem bestimmten Drehwinkel zusammenwirkenden, stationären Lichtleiter 25 zum Lichtempfänger 21 zurückstrahlt. Das über die Auswerteschaltanordnung 26 gesteuerte Relais 27 spricht in diesem Fall nicht an und die Anlage bleibt im betriebsbereiten Zustand, der gegebenenfalls durch ein optisches Signal erkennbar gemacht sein kann. Bleibt zum vorgesehenen Zeitpunkt eine Signalgabe infolge Fehlens einer Reflexionslichtstrahlung aus, weil sich kein Transportgut im Bereich der Abtastzone 4 befindet, so spricht das Relais 27 an und veranlaßt das Stillsetzen der Anlage zweckmäßigerweise mit gleichzeitiger optischer und/oder akustischer Signalgabe.The device described works as follows: If the scanning zone 4 is covered by a transport item 1, for example a paper web, the bundle of light rays emitted by the light transmitter 20 and guided via the light guides 24 and 8 to the scanning zone 4 of the hollow roller 2 will depend on the paper web 1 the quality of which reflects to a greater or lesser extent and reaches the light guide 9, which reflects the reflected light back to the light receiver 21 via the stationary light guide 25 which interacts with it at a certain angle of rotation. The relay 27 controlled by the evaluation switching arrangement 26 does not respond in this case and the system remains in the ready state, which can be identified by an optical signal if necessary. If there is no signal at the scheduled time due to the lack of reflected light radiation because there is no transport goods in the area of the scanning zone 4, the relay 27 responds and expediently shuts down the system with simultaneous optical and / or acoustic signaling.

Soll sich zu einem vorgegebenen Zeitpunkt kein Transportgut im Bereich der Abtastzone 4 befinden, so kann umgekehrt bei nicht vorhandenem Reflexionslichtstrahl die Anlage weiter in Betrieb bleiben und erst beim Vorhandensein eines Transportgutes abgeschaltet werden.If no transport goods are to be located in the area of the scanning zone 4 at a predetermined point in time, the system can conversely continue to operate if the reflected light beam is not present stay and only be switched off when there is a transport good.

Infolge der zentralen Anordnung der den Lichtsendekanal verkörpernden Lichtleiter 24 und 8 wird in der Abtastzone ständig Licht ausgestrahlt, sofern die Einrichtung in Betrieb genommen ist. Hingegen wird wegen der exzentrischen Anordnung der den Reflexionslichtkanal bildenden Lichtleiter 25 und 9 je Umdrehung der Hohlwalze 2 nur einmal Deckungsgleichheit zwischen dem Lichtleiterende 9" und dem Lichtleiter 25 erzielt (vergl. Fig. 3 und Fig. 4), so daß je Walzenumdrehung nur einmal ein Reflexlichtstrahl zum Lichtempfänger 21 gelangen kann. Es ist jedoch auch möglich, mehrere stationäre Reflexionslichtkanäle vorzusehen, die mit dem umlaufenden Ende 9" des Lichtleiters 9 zusammenwirken. Des weiteren besteht die Möglichkeit, die das Reflexlicht übertragenden Lichtleiter 9 und 25 koaxial zu den das Sendelichtstrahlenbündel übertragenden Lichtleitern 8 und 24 anzuordnen. Dementsprechend können auch die in der Abtastzone 4 liegenden Enden 8' und 9' der beiden Lichtleiter 8 und 9 koaxial zueinanderliegend angeordnet werden.As a result of the central arrangement of the light guides 24 and 8 embodying the light transmission channel, light is continuously emitted in the scanning zone if the device is put into operation. On the other hand, because of the eccentric arrangement of the light guide 25 and 9 forming the reflection light channel, only one congruence between the light guide end 9 "and the light guide 25 is achieved per revolution of the hollow roller 2 (see FIGS. 3 and 4), so that only one revolution per roller revolution a reflected light beam can reach the light receiver 21. However, it is also possible to provide a plurality of stationary reflected light channels which interact with the circumferential end 9 ″ of the light guide 9. Furthermore, there is the possibility of arranging the light guides 9 and 25 which transmit the reflected light coaxially to the light guides 8 and 24 which transmit the transmitted light beam. Accordingly, the ends 8 'and 9' of the two light guides 8 and 9 lying in the scanning zone 4 can also be arranged coaxially to one another.

Wie Fig. 5 zeigt, sind hier die beiden Enden der besagten Lichtleiter in einer Hülse 28 koaxial zusammengefaßt und mittels einer Zwischenlage 29 optisch gegeneinander abgeschirmt.As shown in FIG. 5, the two ends of the said light guides are coaxially combined in a sleeve 28 and optically shielded from one another by means of an intermediate layer 29.

Durch Verschwenken des Flansches 13 nach Lösen der Schrauben 14 läßt sich die Winkellage des Lichtleiterendes 9'" bezogen auf den stationären Lichtleiter 25 (Fig. 3 und 4) verändern und somit der Reflexionslichtkanal bei einer anderen, als notwendig oder zweckmäßig erachteten Winkellage aktivieren.By pivoting the flange 13 after loosening the screws 14, the angular position of the light guide end 9 '' relative to the stationary light guide 25 (FIGS. 3 and 4) can be changed and thus the reflection light channel can be activated at another angular position which is deemed necessary or expedient.

Aus Gründen der Betriebssicherheit empfiehlt es sich, den Übergangsbereich zwischen dem umlaufenden Wellenstumpf 12 und dem diesem gegenüberliegenden feststehenden Bauteil (19) mittels einer Dichtung optisch gegen äußeren Lichteinfall sowie auch gegen das Eindringen von Öl und Staub abzuschirmen.For reasons of operational safety, it is advisable to optically shield the transition area between the circumferential stub shaft 12 and the fixed component (19) opposite it by means of a seal against external light and also against the ingress of oil and dust.

Claims (10)

1. Equipment for recognising the presence of stock to be transported on the shell surface of a rotating transport body (2) with the aid of an opti-electrical unit containing an optical transmitter (20) and an optical receiver (21) as well as a circuit arrangement for signal evaluation, wherein the optical transmitter (20) and the optical receiver (21) are arranged to be stationary and the transmission of the light beam bundle emitted by the optical transmitter to the optical receiver takes place by means of optical conductors (8,9), which by their one end (8', 9') open freely into the scanning zone (4) of the rotating transport body (2) and by their other end (8", 9") are led in axial direction out of the transport body (2) to the optical receiver (21), characterised thereby, that the opti-electrical unit operates on the reflection principle and the ends (8", 9") of the optical conductors (8, 9), which serve for the transmission of the transmitted light beam bundle and of the reflected light beam bundle, are so led out of the transport body (2) that the end (8") of the optical conductor (8) also embodying the transmitted light channel is arranged centrally in a bore (10) in the shaft stub (12) of the transport body (2) and the end (9") of the optical conductor (9) also embodying the reflected light channel is housed in a bore (17) lying eccentrically of the central axis of the shaft stub (12), wherein the shaft stub (12) is borne to be rotatable in a component (19) containing the optical transmitter (20) and the optical receiver (21) and the end (8") of the optical conductor (8) cooperates with the optical transmitter (20) and the end (9") of the optical conductor (9) co-operates with the optical receiver (21).
2. Equipment according to claim 1, characterised thereby, that the ends (8", 9") of the optical conductors (8, 9) co-operate by way of further optical conductors (24, 25) with the optical transmitter (20) and the optical receiver (21), wherein the optical conductor (24) leading to the optical transmitter is led in the stationary component (19) co-axially with the end (8") of the optical conductor (8) and the optical conductor (25) corresponding with the optical receiver (21) is so arranged in the component (19) that it is bringable into congruencywith the end (9") of the optical conductor (9).
3. Equipment according to the claims 1 and 2, characterised thereby, that the shaft stub (12) is borne to be rotatable in the stationary component (19) by means of a rolling bearing (18) or the like.
4. Equipment according to claims 1 to 3, characterised thereby, that the shaft stub (12) is component of a flange (13), which is rotatable relative to the transport body (2) by means of screws (14) and elongate slots (16) extending in circumferential direction.
5. Equipment according to the claims 1 to 4, characterised thereby, that several optical reception channels lying on the same radius are provided in the stationary component (19).
6. Equipment according to one of the claims 1 to 5, characterised thereby, that the ends (8', 9') at the scanning end of the optical conductors (8, 9) and/or their ends (8", 9") at the shaft stub end are so combined that they lie one co-axially with the other and are one optically screened from the other.
7. Equipment according to the claims 1 to 6, characterised thereby, that the transition region between the rotating shaft stub (12) and the stationary component (19) opposite thereto is screened against incidence of external light.
8. Equipment according to the claims 1 to 7, characterised thereby, that glass fibres or bundles of glass fibres are used as optical conductors.
9. Equipment according to the claims 1 to 7, characterised thereby, that synthetic material fibres or bundles of synthetic material fibres are used as optical conductors.
10. Equipment according to one of the claims 1 to 9, characterised thereby, that in the case of the optical transmitter (20) and the optical receiver (21) being arranged to be spatially separate from the component (19), they are coupled to the optical conductors (8, 9) by means of the appropriately prolonged optical conductors (24, 25).
EP84115799A 1983-12-22 1984-12-19 Device for detecting the presence of material to be conveyed on the lateral area of a rotating carrier Expired - Lifetime EP0146917B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3346347 1983-12-22
DE19833346347 DE3346347A1 (en) 1983-12-22 1983-12-22 METHOD FOR DETECTING THE EXISTENCE OF TRANSPORT GOODS ON THE SHEET SURFACE OF A ROTATING TRANSPORT BODY

Publications (3)

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EP0146917A2 EP0146917A2 (en) 1985-07-03
EP0146917A3 EP0146917A3 (en) 1987-04-15
EP0146917B1 true EP0146917B1 (en) 1990-03-14

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EP84115799A Expired - Lifetime EP0146917B1 (en) 1983-12-22 1984-12-19 Device for detecting the presence of material to be conveyed on the lateral area of a rotating carrier

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EP (1) EP0146917B1 (en)
DE (2) DE3346347A1 (en)

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CN103726286B (en) * 2014-01-03 2015-11-25 成都瑞克西自动化技术有限公司 Ribbon specification changes recognition device

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Also Published As

Publication number Publication date
EP0146917A3 (en) 1987-04-15
DE3481604D1 (en) 1990-04-19
DE3346347A1 (en) 1985-07-18
EP0146917A2 (en) 1985-07-03
DE3346347C2 (en) 1989-12-07

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