EP1652806B1 - Dispositif pour détecter des units successives d'une bande sans fin - Google Patents

Dispositif pour détecter des units successives d'une bande sans fin Download PDF

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Publication number
EP1652806B1
EP1652806B1 EP05023184A EP05023184A EP1652806B1 EP 1652806 B1 EP1652806 B1 EP 1652806B1 EP 05023184 A EP05023184 A EP 05023184A EP 05023184 A EP05023184 A EP 05023184A EP 1652806 B1 EP1652806 B1 EP 1652806B1
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Prior art keywords
web
unit
sequence
variations
sensor
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Application number
EP05023184A
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German (de)
English (en)
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EP1652806A1 (fr
Inventor
Bahram Dr. Torabi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sick AG
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Sick AG
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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
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • 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
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B65H23/1882—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling longitudinal register of web

Definitions

  • the invention relates to an apparatus and a method for the detection of successive units of an endless, in a conveying process web with a sensor for detecting along the path changing properties thereof.
  • Such devices are well known in the art and are used, for example, in the paper or printing industry for cutting printed or unprinted paper webs into individual sheets or sheets.
  • the endless web or the endless paper strip is provided with markings which are located at a predetermined relative position to the desired reference interface , These markings can then be detected by, for example, sensors designed as contrast sensors, each detection of a marking triggering a cutting process.
  • a disadvantage of these known devices and methods is the fact that specifically for the processing of the endless web or for cutting a paper strip markings must be provided on the web, which are basically undesirable for design reasons. Furthermore, the markings per unit can undesirably lead to a repeated switching of a contrast scanner, so that it can not be clearly recognized which of the on the desired cutting position related switching operation, which in turn can have a faulty cut result.
  • document DE 10154003 A discloses an apparatus and a method according to the preamble of claims 1 and 8, respectively.
  • An object of the invention is to develop a device and a method of the type mentioned in such a way that on the one hand can be dispensed with the disadvantageous markings and on the other hand it is ensured that the processing or cutting of the web takes place in each case at the correct position.
  • the invention is therefore based on the surprising finding that for the detection of successive units of an endless web not necessarily dedicated markers must be attached, but that it is sufficient, the existing anyway on the web, varying over the length of the web properties sensorially to capture and evaluate in an appropriate manner.
  • the changing web properties also have a constant location reference to the transitions of adjacent units, these transitions can also be easily determined with the device according to the invention and with the method according to the invention, so that, for example, automatically a cutting process can be triggered at these transitions.
  • the changes to the web properties to be detected are repeated in all units of the web, so that they can be cut, for example, in noisy mutually identical units.
  • the repetitive changes in the web properties are not present in all units in the same way.
  • a web it is possible for a web to have two different types of units, each of which has mutually repeating changes in web properties, but the changes of one type differ from the other type. In this case, it can then be distinguished according to the invention, of which of the two types is the respectively recognized unit, whereupon a matched to the respective type processing can be triggered.
  • the senor is designed to detect a sequence of a plurality of mutually different changes in the web properties. This makes it possible to detect two or more changes in the web properties relative to each unit of the web, which increases the uniqueness of the detection result. If, for example, three different changes per unit are to be detected, of which the last change occurs during the transition to the subsequent unit, it can be checked according to the invention whether the first two changes were detected first, whereupon the third change only counts as a transition to the next unit if the first two changes were detected correctly before. The security and reliability of a correct recognition can thus be significantly increased by this preferred variant of the invention.
  • a memory in which a chronological setpoint sequence of the changes to be detected per unit can be stored. Furthermore, an evaluation unit is provided for comparing the actually chronologically detected change sequence with the stored desired sequence, with which it is checked whether the expected change sequence was actually detected and thus a unit was recognized. In the case of the correspondence between the stored desired sequence and the detected change sequence, the evaluation unit can then emit a detection signal related to the detected unit.
  • the relative time references and / or the respective type of changes and / or the respective degree of changes can be taken into account in addition to the chronology of the changes. In this case, it is then examined in which temporal relation the detected changes are related to each other and / or of which type and of which magnitude the detected changes were.
  • All changes detected on one unit preferably lead to the delivery of only a single detection signal, which can be unambiguously assigned to the respectively detected unit.
  • This single detection signal is preferably dependent on a change with a comparatively high degree of change, since such a change, which may be formed for example as a particularly striking, sharp color transition, can be recognized particularly well by the sensor. If the distance between this change and the beginning or the end of the respective unit is known, the start and end of the unit can be identified with a particularly high spatial resolution, since the respective position can be simply calculated from the position of the detected change and the known distance ,
  • a delay element may also be provided for triggering the detection signal with an adjustable time delay after detection of the correspondence between the stored desired sequence and the actually detected change sequence.
  • a delay element can be taken into account, for example, the fact that a cutting device is behind the sensor according to the invention in the conveying direction and thus must depend on the detection of a unit dependent on the delivery speed time until the detected unit or its beginning or the End is located in the area of the cutting device.
  • the delay element can thus be set, for example, exactly so that, depending on the units detected according to the invention, a cut always takes place exactly at the transition between two units by the cutting device.
  • the delay element can be considered with the delay element, if the last detection of a change in a unit not at the end of the unit but already before, so that the end of the unit is not yet below the sensor at detection of the last change.
  • the delay element is then adjusted in dependence on the conveying speed such that the delay time or at least a component thereof corresponds to the time required to further convey the unit by the distance between the last detected change and the end of the unit.
  • the delay element can also be adjusted so that, on the one hand, the latter delay and, on the other hand, the already mentioned distance between the sensor and a cutting device is taken into account.
  • the delay times caused by the delay element do not necessarily have to be constant. Rather, they can be adapted to the respective conveying speeds. In particular, however, a change in the delay times during the conveying process of a single web can take place, if this web is conveyed at different times at different speeds.
  • a constant delay time can also be given at a constant conveying speed, since in this case, for example, the sensor can simply be displaced along the conveying path as part of a teaching operation, until e.g. a separation process initiated by the sensor always takes place exactly at the transitions between two units.
  • conveying speed can be closed from the detected changes on the length of color elements, which are located on the web.
  • the beginning and the end of such color elements are detected as changes according to the invention, and the time elapsed between these detection operations can then be considered the conveying speed the length of a color element is calculated and stored.
  • the length of the color elements calculated in this way can then be used as a recognition feature for successive units by checking on each unit of the web whether the color elements assigned to the respective unit have the length determined in previous units.
  • the conveying speed is known only during a training phase and is no longer known during further operation
  • the length of a color element determined in normal operation can be used to calculate the currently present relative conveying speed.
  • a normalized conveying speed of 1 may be present within the scope of the teaching process, in which the value of 1, which is also normalized, is determined as the length of a color element, for example. If a length of the color element of 2 is now detected in the normal operation of the system following the training phase, it can be assumed that the instantaneous conveying speed-also normalized-is 0.5.
  • the sensor for detecting the changes in web properties used according to the invention can be designed so that it can detect changes in the color, the contrast, the reflectivity and / or other surface textures of the web.
  • Different types of changes in the web properties can thus be used to implement the inventive concept, whereby, for example, sensor arrangements consisting of a plurality of sensors can also be used, which can simultaneously detect different types of changes. It is therefore quite possible to detect a single unit by detecting successive changes in the web properties of different types. Basically you will always use those types of changes for the evaluation, with which the amplitude-wise largest sensor signals can be generated, since in this way the risk of misdetections is minimized.
  • the senor can be designed as a contrast scanner, which can illuminate the web with different transmission colors. In this case, depending on the color of the changes to be detected during the scanning of each unit, the transmission color can then be changed such that a respective maximum contrast value is established.
  • the web investigated according to the invention may be a printed or unprinted paper web.
  • the printing ink present on the web can trigger the contrast jumps to be evaluated according to the invention.
  • Fig. 1 a portion of an elongate web 1 is shown, which consists of paper and is transported in the conveying direction A.
  • Paper web was previously provided in a printing machine, inter alia, with imprints 2, 3, wherein the imprints 2 differ in color from the imprints 3.
  • the paper web 1 consists of adjacent, mutually identical units 10. The transition between two adjacent units is in Fig. 1 denoted by the reference numeral 11.
  • Fig. 1 It can be seen that the imprints 2, 3 are arranged in all successive units 10 in each case in the same position and in particular at the same relative position with respect to the transitions 11, so that the imprints 2, 3 along the path 1 ultimately form a periodically repeating pattern ,
  • a sensor 4 is arranged, which is designed as a contrast sensor, which can illuminate the web 4 with different colors.
  • a cutting device 5 is provided, by means of which the web 1 can be cut perpendicular to the conveying direction A.
  • Sensor 4 and cutting device 5 are coupled via data and control lines to an evaluation unit 6, which receives and processes data from the sensor 4 and furthermore is able to control the sensor 4 and the cutting device 5.
  • FIG. 1 A block diagram of the evaluation unit 6 according to Fig. 1 is in Fig. 2 shown.
  • the central component of this evaluation unit 6 is the arithmetic unit 7, which can be formed, for example, as a commercially available microprocessor. Via an interface A, the arithmetic unit 7 receives signals from the sensor 4, via an interface B, the arithmetic unit 7 can control the sensor 4. Via an interface C, the arithmetic unit 7 receives information regarding the current conveying speed of the web 1.
  • the arithmetic unit 7 communicates with a memory 8, in which a chronological setpoint sequence of the color changes to be detected by the sensor 4 can be stored.
  • the arithmetic unit 7 acts on a delay unit 9 whose delay time .DELTA.t is variably adjustable via the arithmetic unit 7.
  • the output of the delay unit 9 is fed to an interface D, which is connected to the cutting device 5 and triggers a cutting operation upon the delivery of a signal via the interface D.
  • a chronological setpoint sequence of the color changes to be detected per unit 10 is stored in the memory 8.
  • This setpoint sequence can be determined, for example, by means of a teach process via the sensor 4.
  • the memory 8 is also stored, in which temporal sequence caused by the imprints 2, 3 changes occur. In concrete terms, it is thus stored with which temporal relation in each case the beginning and end of the imprints 2, 3 pass by the sensor 4 at a predetermined conveying speed.
  • the rear end of the imprints 2 in the direction of conveyance A is the most striking color transition in the area of the imprints 2, 3 and the distance d of this color transition from the transition the unit 10 carrying the respective imprint to the next unit 10 is known to the evaluation unit 6.
  • the sensor 4 then provides change signals each time the beginning and end of the imprints 2, 3 are passed past the sensor. These data are supplied to the arithmetic unit 7 via the interface A, whereupon the arithmetic unit 7 compares these data with the values stored in the memory 8. If the computing unit 7 determines in the context of a real-time processing that the sequence of detected changes coincides with the sequence stored in the memory 8, it can be assumed that after recognizing the then expected rear end of the imprint 2, which represents the most striking color transition , this rear end of the imprint 2 is just below the sensor 4.
  • the arithmetic unit 7 can accurately calculate from the known distance between sensor 4 and cutting device 5 and said distance d, after which delay time the transition 11, which follows the end of the detected imprint 2, comes to lie below the cutting device 5. After elapse of a corresponding delay time .DELTA.t, which is effected by the delay element 9, then a switching signal is output via the interface D to the cutting device, which triggers a cutting process along the transition 11. If the conveying speed changes, the arithmetic unit 7 can calculate a correspondingly adapted delay time ⁇ t, which is then made available to the delay element 9 by the arithmetic unit 7.

Landscapes

  • Controlling Sheets Or Webs (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Advancing Webs (AREA)
  • Sorting Of Articles (AREA)

Claims (8)

  1. Dispositif pour la reconnaissance d'unités successives (10) d'une bande sans fin (1) qui se trouve dans un processus de convoyage, avec un capteur (4) pour la détection de propriétés de la bande (1) qui varient le long de la bande (1), ledit capteur (4) étant conçu pour détecter des variations de la couleur, du contraste, du pouvoir de réflexion et/ou d'autres propriétés de surface de la bande (1), qui se répètent dans les unités successives (10),
    caractérisé en ce que le capteur (4) est conçu pour reconnaître la succession de plusieurs variations, différentes les unes des autres, des propriétés de bande de chaque unité (10) à reconnaître,
    en ce qu'il est prévu une mémoire (8) dans laquelle il est possible de mémoriser une succession de consigne chronologique des variations à détecter par unité (10), et
    en ce qu'il est prévu une unité d'évaluation (6) pour comparer la succession de variations chronologiques effectivement détectée avec la succession de consigne et pour déclencher un signal de détection se référant à une unité reconnue (10).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que lors de la comparaison de la succession de consigne mémorisée avec la succession de variations effectivement détectée, il est également tenu compte, outre de la chronologie des variations, aussi de leurs rapports temporels relatifs et/ou du type de variations respectives et/ou du degré respectif des variations.
  3. Dispositif selon l'une des revendications 1 ou 2,
    caractérisé en ce que pour chaque unité (10) seul un unique signal de détection, en particulier dépendant d'une variation avec un degré de variation comparativement élevé, est déclenchable.
  4. Dispositif selon l'une des revendications 1 à 3,
    caractérisé en ce qu'un circuit de retard (9) est prévu pour déclencher le signal de détection avec un retard temporel réglable ou constant, après reconnaissance de la coïncidence entre la succession de consigne mémorisée et la succession de variations effectivement détectée.
  5. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que le capteur (4) est réalisé sous forme de capteur de contraste, dont la couleur d'émission est modifiable en fonction des variations à détecter rendant le palpage de chaque unité (10) pour atteindre une valeur de contraste respective maximum.
  6. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que la bande (1) est une bande de papier, en particulier imprimé.
  7. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que, en fonction du signal de détection, une opération de coupe est susceptible d'être déclenchée.
  8. Procédé pour reconnaître des unités successives (10) d'une bande sans fin (1) qui se trouve dans un processus de convoyage, avec un capteur (4) qui détecte des propriétés de la bande (1) variables le long de la bande (1), dans lequel on détecte des variations de la couleur, du contraste, du pouvoir réflecteur et/ou d'autres propriétés de surface de la bande (1), qui se répètent dans des unités successives (10), en particulier dans toutes les unités successives (10),
    caractérisé en ce que le capteur (4) détecte pour chaque unité à reconnaître (10) la succession de plusieurs variations des propriétés de la bande, différentes les unes des autres,
    en ce que l'on mémorise dans une mémoire (8) une succession de consigne chronologique des variations à détecter par unité (10), et
    en ce qu'une unité d'évaluation (6) compare la succession de variations chronologiques effectivement détectée avec la succession de consigne et, en cas de coïncidence, déclenche un signal de détection se référant à une unité reconnue (10).
EP05023184A 2004-10-28 2005-10-24 Dispositif pour détecter des units successives d'une bande sans fin Active EP1652806B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004052451A DE102004052451A1 (de) 2004-10-28 2004-10-28 Vorrichtung zur Erkennung von aufeinanderfolgenden Einheiten einer endlosen Bahn

Publications (2)

Publication Number Publication Date
EP1652806A1 EP1652806A1 (fr) 2006-05-03
EP1652806B1 true EP1652806B1 (fr) 2008-05-14

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EP05023184A Active EP1652806B1 (fr) 2004-10-28 2005-10-24 Dispositif pour détecter des units successives d'une bande sans fin

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EP (1) EP1652806B1 (fr)
AT (1) ATE395287T1 (fr)
DE (2) DE102004052451A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2459455A1 (fr) 2009-07-29 2012-06-06 Sidel S.p.A. Système d'enregistrement sans marque pour étiquettes dans des machines d'étiquetage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1393147B1 (it) 2009-03-09 2012-04-11 Sacmi Labelling S P A Ora Sacmi Verona S P A Apparato e metodo di alimentazione
DE102015219630A1 (de) * 2015-09-24 2017-03-30 Bhs Corrugated Maschinen- Und Anlagenbau Gmbh Wellpappe-Anlage

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5235515A (en) * 1992-02-07 1993-08-10 Kimberly-Clark Corporation Method and apparatus for controlling the cutting and placement of components on a moving substrate
DE19640023B4 (de) * 1996-06-26 2006-06-29 Mahlo Gmbh & Co Kg Verfahren zur Verzugskorrektur
US6444064B1 (en) * 1997-12-19 2002-09-03 Procter & Gamble Company Registration system for phasing simultaneously advancing webs of material having variable pitch lengths
GB2332386B (en) * 1997-12-19 2001-08-08 Bitrim Manufacturers And Distr A cutting machine
DE10154003A1 (de) * 2001-11-02 2003-05-15 Heidelberger Druckmasch Ag Vorrichtung und Verfahren zur Positionierung eines Querschnitts auf einem Bedruckstoff in Rollendruckmaschinen
DE10261747A1 (de) * 2002-12-30 2004-07-22 Sander, Hansjürgen Verfahren zur Herstellung von Teppichteilstücken, Vorrichtung zur Herstellung von Teppichteilstücken sowie Teppichbahn als Ausgangsmaterial zur Herstellung von Teppichteilstücken

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2459455A1 (fr) 2009-07-29 2012-06-06 Sidel S.p.A. Système d'enregistrement sans marque pour étiquettes dans des machines d'étiquetage
EP2459455B1 (fr) * 2009-07-29 2015-03-18 Sidel S.p.A. Procédé effectuée par le système d'enregistrement pour commander l'étiquetage
EP2902330A1 (fr) * 2009-07-29 2015-08-05 Sidel S.p.A. Système d'enregistrement sans marque pour des étiquettes dans des machines d'étiquetage

Also Published As

Publication number Publication date
DE502005004098D1 (de) 2008-06-26
ATE395287T1 (de) 2008-05-15
DE102004052451A1 (de) 2006-05-04
EP1652806A1 (fr) 2006-05-03

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