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EP0433718A1 - Method and device for winding webs - Google Patents

Method and device for winding webs Download PDF

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Publication number
EP0433718A1
EP0433718A1 EP90122717A EP90122717A EP0433718A1 EP 0433718 A1 EP0433718 A1 EP 0433718A1 EP 90122717 A EP90122717 A EP 90122717A EP 90122717 A EP90122717 A EP 90122717A EP 0433718 A1 EP0433718 A1 EP 0433718A1
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EP
European Patent Office
Prior art keywords
roller
package
winding
value sequence
speed
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.)
Ceased
Application number
EP90122717A
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German (de)
French (fr)
Inventor
Hubert Upmann
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B HAGEMANN GmbH AND Co
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B HAGEMANN GmbH AND Co
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Filing date
Publication date
Application filed by B HAGEMANN GmbH AND Co filed Critical B HAGEMANN GmbH AND Co
Publication of EP0433718A1 publication Critical patent/EP0433718A1/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/04—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated
    • B65B11/045—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated by rotating platforms supporting the articles
    • 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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/02—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders
    • B65B11/025—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders by webs revolving around stationary articles

Definitions

  • the invention relates to a method for winding a film web around a package, which has a cross-section that causes changes in the time required length of film web during winding, with a rotating around the package winding device, which comprises at least one roller that corresponds to the one Cross-section of the package corresponding value sequence is controllable in its speed and the controlled length of the film web is controlled.
  • the invention further relates to a device for performing the above method.
  • a device and a method of the type mentioned at the outset are known from GB-OS 2 154 536.
  • the control means for the circulating roller are not coupled to the film web.
  • These control means have means for forming a predetermined model which approximates the cross-sectional shape of the load.
  • the speed of the roller is controlled according to this model.
  • the control is independent of the ascertainable changes in the tension of the film web as well as of the changes in the demand rate that are actually detected.
  • the model is an idealized load model, which is constructed mechanically and which shows the difference between the controlled delivery speed and the rate on one holds constant value as possible.
  • a disadvantage of the known device is that the "model", which essentially consists of several rollers that can be displaced on a guide, is to be defined in a very cumbersome manner and is to be defined as a transformation of the package crosspiece. Furthermore, the model can always only provide an idealized form, since the number of model parameters and thus the addressed value sequence can only assume a very limited number of values.
  • DE-OS 27 50 780 is also known from DE-OS 27 50 780 is a stretch film wrapping machine for pallet loads, which guides the film strip between the film roll and the pallet around an articulated deflection roller, on which a constant but adjustable force acts. If the deflection roller is deflected against the force of the central position by a higher film tension, the braking torque is reduced by a control (e.g. pressure control valve or potentiometer) by a value that is roughly proportional to the angle of the deflection.
  • a control e.g. pressure control valve or potentiometer
  • the aforementioned method is usually initiated in such a way that to determine the value sequence, a revolution takes place at a lower angular velocity than the angular revolutions are carried out later in the operating state.
  • the value sequence is determined, for example, by a voltage button.
  • the rotational speed to be controlled is directly proportional to the tension determined in the respective winding state.
  • the voltage is then of course no longer measured, but the voltage transmitter or button is switched out of engagement.
  • the proposed procedure is usually also carried out digitally.
  • the number of increments of the step-by-step scanning should be chosen so large, for example 21 2 per 360 ° revolution, that a practically completely continuous control is carried out.
  • the main advantage is the very quick possibility of scanning the cross-sectional contour of the respective package.
  • a control cycle can be carried out after 5 or 20 or any number of cycles which results in a new sequence of values which is then valid for the following five (as an example) to n round trips.
  • a stretching mechanism which also includes the discharge roller, can be installed upstream of the discharge roller.
  • two rolls are required, which rotate in a certain relationship to one another and are encompassed one after the other by the film web. This possibility can also be implemented in a simple manner by the control system, since the two rollers can each rotate in a more precisely dependent manner.
  • the device is similar to known winding devices as they are known.
  • FIG. 1 shows a top view of a device for wrapping packages 1.
  • the device has a roller guide device 2 with which a film web 3 can be drawn off from a supply roll 4.
  • the supply roll 4 can be rotated together with a winding device 5 around the roll guide device 2.
  • the winding device 5 consists of a base plate 6, on which there are two driven rollers, namely an outlet roller 7 and an inlet roller 8. The two roles are rotated by a gear (not shown) in their mutual rotational speed in a fixed ratio.
  • the film web 3 first runs around the feed roller 8 and then in an S-loop the outlet roller 7.
  • the roller drives are usually hydraulic motors or electric motors which can be controlled from the outside.
  • the film web 3 then passes over a push-button roller 9 with which the tension of the film web 3 can be scanned.
  • a value sequence which corresponds to the cross section of the package 1 is first set up at a slow circulation speed, that is to say, for example, at a circulation speed of 1/10 revolution per second. This is done in that the film web is attached to the package 1.
  • the button roller 9 is placed on the film and held in a certain middle position.
  • the feeler roller 9 is connected to a feeler arm 10, which is rotatable about a pivot point 11, which is located on the base plate 6, and is connected via a link contour 12.
  • the position of the feeler arm 10 or the feeler roller 9 is entered into a displacement sensor 14 via a further feeler arm 13.
  • FIG. 2 shows such a diagram.
  • This sequence of values is stored in an electronic data memory.
  • the sequence of values standardized from the data memory mentioned is used sequentially to control the rotational speed of the idler roller 7.
  • the percentage change in feed rate ⁇ of the idler roller 7 from an average speed is directly proportional to the voltage change values as found during the first "test run".
  • the probe arm 10 is pivoted out of the contact area with the film strip 3 into position E.
  • the probe arm remains in contact and is used, for example, to detect unexpected changes or major errors, for example a crack of the film strip or an unexpected increase in tension, for example by emigration of the package 1 from the coordinate cross, as defined in FIG. 2. It is essential that the rotational speed of the idler roller 7 can be controlled in very small increments following the sequence of values and thus ensures that the tension of the film strip is exactly maintained. Very irregular cross sections, for example a box with protruding bottle necks, as shown as package 1, can also be detected here.
  • the data memory 15 is only shown schematically.
  • Such data memories are of course known from electronic data processing. However, it should not be ruled out that paper tape or the like, for example, are also suitable as data memories.
  • the discharge roller 7 and the feed roller 8 are coupled to one another in such a way that a fixed speed ratio of the two rollers can be generated to produce a film stretch between the two rollers.
  • stretching mechanisms are known per se, but can advantageously be integrated into a device of the aforementioned type.
  • the method can advantageously also be modified in that the value sequence required for controlling the roller (7) after input of known, e.g. B. previously measured package dimensions, e.g. B. calculated from a keyboard in the machine control of this, stored in a data memory and used to control the speed of rotation of the idler.
  • package dimensions can also be recorded, for example, by non-contact measuring devices.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Basic Packing Technique (AREA)

Abstract

The invention relates to a method of winding a web around a package which has a cross-section which during winding induces changes in the length of web required at various times. The method operates with a winding device which rotates about the package and comprises at least one feed roller (7), which can be controlled in its speed according to a sequence of values corresponding to the cross-section of the package (1) and delivers in a controlled way the length of web required at various times. …<??>In order to enter the sequence of values more easily, quickly and consequently reliably for determination, the sequence of values required for controlling the feed roller (7) is determined in at least a first revolution of the winding device (5) by means of measuring the tension of the web downstream from the feed roller (7) in dependence on the angular position PHI of the winding device (5), stored in a data memory (15) and used in appropriately normalised form for controlling the speed of rotation of the feed roller (7). …<??>A device for carrying out the method has a tension sensor, which is downstream from the feed roller (7), makes contact with the web (3) and uses a signal converter to sense the tensions occurring during the rotation of the feed roller as a sequence of values in dependence on the angle of rotation PHI .

Description

Die Erfindung betrifft ein Verfahren zum Wickeln einer Folienbahn um ein Packstück, das einen Querschnitt besitzt, der während des Wickelns Änderungen in der zeitlich benötigten Länge an Folienbahn hervorruft, mit einer um das Packstück rotierenden Wickelvorrichtung, die wenigstens eine Ablaufrolle umfaßt, die entsprechend einer dem Querschnitt des Packstücks entsprechenden Wertesequenz in ihrer Drehzahl steuerbar ist und die zeitlich benötigte Länge an Folienbahn gesteuert abgibt. Die Erfindung betrifft ferner eine Vorrichtung zur Durchführung des genannten Verfahrens.The invention relates to a method for winding a film web around a package, which has a cross-section that causes changes in the time required length of film web during winding, with a rotating around the package winding device, which comprises at least one roller that corresponds to the one Cross-section of the package corresponding value sequence is controllable in its speed and the controlled length of the film web is controlled. The invention further relates to a device for performing the above method.

Ans der GB-OS 2 154 536 sind eine Vorrichtung und ein Verfahren der eingangs genannten Art bekannt. Bei dieser Vorrichtung sind die Steuermittel für die Umlaufsrolle nicht an die Folienbahn gekoppelt. Diese Steuermittel besitzen Einrichtungen zur bildung eines vorbestimmten, im wesentlichen die Querschnittsform der Last annähernden Modells. Entsprechend diesem Modell wird die Geschwindigkeit der Ablaufrolle gesteuert. Dabei ist die Steuerung unabhängig von den feststellbaren Änderungen in der Spannung der Folienbahn als auch von den tatsächlich festgestellten Änderungen in der Bedarfsrate. Das Modell ist ein idealisiertes Lastmodell, das mechanisch aufgebaut ist und welches die Differenz zwischen der gesteuerten Liefergeschwindigkeit und der Rate auf einen möglichst konstanten Wert hält. Nachteilig bei der bekannten Vorrichtung ist, daß in sehr umständlicher Weise das "Modell", welches im wesentlichen aus mehreren auf einer Führung verschiebbaren Rollen besteht, zu definieren und quasi als Transformation des Packstück-Querstückes festzulegen ist. Weiterhin kann das Modell immer nur eine idealisierte Form vorgeben, da die Anzahl der Modellparameter und damit die angesprochene Wertesequenz nur eine sehr begrenzte Anzahl von Werten annehmen kann.
Bekannt ist ferner aus der DE-OS 27 50 780 eine Streckfolieneinschlagmaschine für Palettenladungen, die das Folienband zwischen Folienrolle und Palette um eine gelenkig gelagerte Umlenkrolle führt, auf die eine konstante, jedoch einstellbare Kraft wirkt. Wenn die Umlenkrolle durch eine höhere Folienspannung gegen die Kraft der Mittellage ausgelenkt wird, wird über eine Steuerung (z.B. Druckregelventile oder Potentiometer) das Bremsmoment um einen Wert reduziert, der etwa proportional dem Winkel der Auslenkung ist.A device and a method of the type mentioned at the outset are known from GB-OS 2 154 536. In this device, the control means for the circulating roller are not coupled to the film web. These control means have means for forming a predetermined model which approximates the cross-sectional shape of the load. The speed of the roller is controlled according to this model. The control is independent of the ascertainable changes in the tension of the film web as well as of the changes in the demand rate that are actually detected. The model is an idealized load model, which is constructed mechanically and which shows the difference between the controlled delivery speed and the rate on one holds constant value as possible. A disadvantage of the known device is that the "model", which essentially consists of several rollers that can be displaced on a guide, is to be defined in a very cumbersome manner and is to be defined as a transformation of the package crosspiece. Furthermore, the model can always only provide an idealized form, since the number of model parameters and thus the addressed value sequence can only assume a very limited number of values.
Also known from DE-OS 27 50 780 is a stretch film wrapping machine for pallet loads, which guides the film strip between the film roll and the pallet around an articulated deflection roller, on which a constant but adjustable force acts. If the deflection roller is deflected against the force of the central position by a higher film tension, the braking torque is reduced by a control (e.g. pressure control valve or potentiometer) by a value that is roughly proportional to the angle of the deflection.

Es zeigt sich, daß die bekannte Wickelfolieneinschlagmaschine für Palettenladungen nicht ohne weiteres für das Wickeln einer Folienbahn um ein Packstück, des einen Querschnitt besitzt, der während des Wickelns Änderungen in der zeitlich benötigten Länge an Folienbahn hervorruft, Verwendung finden kann.It has been found that the known wrapping film wrapping machine for pallet loads cannot readily be used for wrapping a film web around a package which has a cross section which causes changes in the length of film web required in time during the winding.

Es stellt sich demnach die Aufgabe, das eingangs genannte Verfahren dahingehend abzuwandeln, daß kein mechanisches Modell mehr erstellt werden muß, sondern die Wertesequenz auf einfachere und schnellere und dabei zuverlässigere Art und Weise ermittelt wird. Die Erfindung soll weiterhin die Aufgabe erfüllen, daß ein mechanisehes Modell nicht mehr erforderlich ist.It is therefore the task of modifying the method mentioned at the outset in such a way that a mechanical model no longer has to be created, but rather the value sequence is determined in a simpler and faster and at the same time more reliable manner. The invention is also intended to fulfill the task that a mechanical model is no longer required.

Diese Aufgabe wird gelöst bei einem Verfahren der eingangs genannten Art, das dadurch gekennzeichnet ist, daß die für die Steuerung der Ablaufrolle benötigte Wertesequenz in wenigstens einem ersten Umlauf der Wickelvorrichtung mittels Spannungsmessungen an der Folienbahn stromab zur Ablaufrolle in Abhängigkeit von der Winkelstellung der Wickelvorrichtung ermittelt wird, in einem Datenspeicher gespeichert und entsprechend normiert zur Steuerung der Umdrehungsgeschwindigkeit der Ablaufrolle verwendet wird.This problem is solved with a method of the beginning mentioned type, which is characterized in that the value sequence required for the control of the reel is determined in at least a first revolution of the winding device by means of voltage measurements on the film web downstream of the reel in dependence on the angular position of the winding device, stored in a data memory and standardized accordingly Control of the speed of rotation of the idler roller is used.

Das vorgenannte Verfahren wird üblicherweise so eingeleitet, daß zur Ermittlung der Wertesequenz ein Umlauf mit geringerer Winkelgeschwindigkeit erfolgt als später die Winkelumläufe im Betriebszustand durchgeführt werden.The aforementioned method is usually initiated in such a way that to determine the value sequence, a revolution takes place at a lower angular velocity than the angular revolutions are carried out later in the operating state.

Die Wertesequenz wird beispielsweise durch einen Spannungstaster ermittelt. Die zu steuernde Umlaufgeschwindigkeit ist direkt proportional der im jeweiligen Wikkelzustand ermittelten Spannung. Während des Betriebszustandes wird die Spannung dann selbstverständlich nicht mehr gemessen, sondern der Spannungsgeber oder - taster außer Eingriff geschaltet. Die vorgeschlagene Verfahrensweise wird üblicherweise auch digital durchgeführt. Jedoch sind die Zahl der Inkremente der schrittweisen Abtastuug so groß zu wählen, beispielsweise 2¹⁰ pro 360° Umlauf, daß eine praktisch völlig kontinuierliche Steuerung vorgenommen wird. Der Hauptvorteil besteht allerdings in der sehr schnellen Möglichkeit, die Querschnittskontur des jeweiligen Packstückes abzutasten.The value sequence is determined, for example, by a voltage button. The rotational speed to be controlled is directly proportional to the tension determined in the respective winding state. During the operating state, the voltage is then of course no longer measured, but the voltage transmitter or button is switched out of engagement. The proposed procedure is usually also carried out digitally. However, the number of increments of the step-by-step scanning should be chosen so large, for example 2¹ 2 per 360 ° revolution, that a practically completely continuous control is carried out. The main advantage, however, is the very quick possibility of scanning the cross-sectional contour of the respective package.

Normalerweise werden die Packstücke während des Wickelns durch die Umlaufbahn der Wickelvorrichtung vorgeschoben. Dabei ist auch möglich daß sieh die Querschnittskontur über die Vorschublänge des Packstückes ändert. Falls gewünscht, kann demnach jeweils nach 5 oder 20 oder beliebig n Umläufen immer wieder ein Steuerungsumlauf vorgenommen werden, der eine neue Wertesequenz ergibt, die dann für die folgenden fünf (als Beispiel) bis n Umläufen Gültigkeit hat.Normally, the packages are fed through the orbit of the winder during winding. It is also possible that you see the cross-sectional contour changes over the feed length of the package. If desired, a control cycle can be carried out after 5 or 20 or any number of cycles which results in a new sequence of values which is then valid for the following five (as an example) to n round trips.

Wesentlich ist weiterhin, daß mit dem vorstehenden Verfahren eine äußertst schonende und trotzdem effiziente Nutzung der Folienbahn möglich ist. Der Ablaufrolle vorgeschaltet werden kann ein Reckwerk, das die Ablaufrolle auch einbezieht. Hierzu sind zwei Rollen erforderlich, die in einem bestimmten Verhältnis zueinander umlaufen und nacheinander von der Folienbahn umfaßt werden. Auch diese Möglichkeit ist durch die Steuerung in einfacher Weise zu realisieren, da die beiden Rollen jeweils in genauer erforderlicher Abhängigkeit rotieren können.It is also essential that the above method enables extremely gentle yet efficient use of the film web. A stretching mechanism, which also includes the discharge roller, can be installed upstream of the discharge roller. For this purpose, two rolls are required, which rotate in a certain relationship to one another and are encompassed one after the other by the film web. This possibility can also be implemented in a simple manner by the control system, since the two rollers can each rotate in a more precisely dependent manner.

Im übrigen ähnelt die Vorrichtung bekannten Wickelvorrichtungen, wie sie bekannt sind.Otherwise, the device is similar to known winding devices as they are known.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Die Figuren zeigen im einzelnen:

Figur 1
in schematischer Ansicht eine Vorrichtung zur Durchführung des Verfahrens im Bereich des Umlaufes,
Figur 2
zeigt eine bestimmte Packform und die dafür erforderliche prozentuale Vorschubänderung Γ.
An embodiment of the invention is shown in the drawing. The figures show in detail:
Figure 1
a schematic view of a device for performing the method in the area of the circulation,
Figure 2
shows a specific pack shape and the required percentage feed change Γ.

Die Figur 1 zeigt in Draufsicht eine Vorrichtung zum Umwickeln von Packstücken 1. Die Vorrichtung weist eine Rollen-Führeinrichtung 2 auf, mit der von einer Vorratsrolle 4 eine Folienbahn 3 abgezogen werden kann. Die Vorratsrolle 4 ist zusammen mit einer Wickelvorrichtung 5 um die Rollen-Führeinrichtung 2 drehbar. Die Wickelvorrichtung 5 besteht aus einer Basisplatte 6, auf der sich zwei angetriebene Rollen, nämlich eine Ablaufrolle 7 und eine Zulaufrolle 8, befinden. Die beiden Rollen werden durch ein (nicht dargestelltes) Getriebe in ihrer gegenseitigen Umdrehungsgeschwindigkeit in einem festgelegten Verhältnis gedreht. Die Folienbahn 3 umläuft zunächst die Zulaufrolle 8 und dann in einer S-Schlinge die Ablaufrolle 7. Die Rollenantriebe sind üblicherweise Hydraulikmotoren oder Elektromotoren, die von außen gesteuert werden können. Anschließend gelangt die Folienbahn 3 über eine Tasterrolle 9, mit der die Spannung der Folienbahn 3 abgetastet werden kann.FIG. 1 shows a top view of a device for wrapping packages 1. The device has a roller guide device 2 with which a film web 3 can be drawn off from a supply roll 4. The supply roll 4 can be rotated together with a winding device 5 around the roll guide device 2. The winding device 5 consists of a base plate 6, on which there are two driven rollers, namely an outlet roller 7 and an inlet roller 8. The two roles are rotated by a gear (not shown) in their mutual rotational speed in a fixed ratio. The film web 3 first runs around the feed roller 8 and then in an S-loop the outlet roller 7. The roller drives are usually hydraulic motors or electric motors which can be controlled from the outside. The film web 3 then passes over a push-button roller 9 with which the tension of the film web 3 can be scanned.

Die Rotation der Wickelvorrichtung zusammen mit der Vorratsrolle geschieht in üblicher Weise um die Rollen-Führeinrichtung 2. Entsprechende Vorrichtungen sind aus dem Stand der Technik, wie eingangs zitiert, zu entnehmen.The rotation of the winding device together with the supply roll takes place in the usual way around the roll guide device 2. Corresponding devices can be found in the prior art, as cited at the beginning.

Zur Durchführung des Verfahrens wird mit langsamer Umlaufgeschwindigkeit, also beispielsweise mit einer Umlaufgeschwindigkeit von 1/10 Umdrehung pro Sekunde zunächst eine Wertesequenz aufgestellt, die dem Querschnitt des Packstückes 1 entspricht. Dies geschieht dadurch, daß die Folienbahn an das Packstück 1 angesetzt wird. Die Tasterrolle 9 wird auf die Folie aufgesetzt und in einer bestimmten Mittelstellung gehalten. Die Tasterrolle 9 ist mit einem Tastarm 10 verbunden, der um einen Drehpunkt 11, der sich an der Basisplatte 6 befindet, drehbar ist und über eine Kulissen-Kontur 12 verbunden ist. Über einen weiteren Tastarm 13 wird die Stellung des Tastarms 10 bzw. der Tastrolle 9 in einen Wegaufnehmer 14 eingegeben. Je größer die Spannung des Folienbandes 3 ist, um so geringer wird die Tastrolle 9 das Band nachstraffen können und um so gerimger ist der Ausschlag des Weggebers 14. Bei einem Umlauf kann demnach abhängig von der jeweiligen Winkelstellung Φ die Spannung gemessen werden.To carry out the method, a value sequence which corresponds to the cross section of the package 1 is first set up at a slow circulation speed, that is to say, for example, at a circulation speed of 1/10 revolution per second. This is done in that the film web is attached to the package 1. The button roller 9 is placed on the film and held in a certain middle position. The feeler roller 9 is connected to a feeler arm 10, which is rotatable about a pivot point 11, which is located on the base plate 6, and is connected via a link contour 12. The position of the feeler arm 10 or the feeler roller 9 is entered into a displacement sensor 14 via a further feeler arm 13. The greater the tension of the film strip 3, the lower the feeler roller 9 will be able to tighten the tape and the smaller the deflection of the displacement sensor 14. With one revolution, the tension can therefore be measured depending on the respective angular position Φ.

Fin solches Diagramm zeigt der untere Teil der Figur 2. Hierbei ergibt sich eine Wertesequenz von beispielsweise 1024 Werten, die in einem Umlauf der Wickelvorrichtung gewonnen werden. Diese Wertesequenz wird in einem elektronischen Datenspeicher gespeichert. Anschließend beschleunigt sich die Umdrehungsgeschwindigkeit der Wickelvorrichtung 5 und das Packstück 1 wird durch die Rollen-Führeinrichtung vorgeschoben. Dabei wird sequentiell von dem genannten Datenspeicher die Wertesequenz normiert zur Steuerung der Umdrehungsgeschwindigkeit der Ablaufrolle 7 verwendet. Wie bereits eingangs gesagt, ist die prozentuale Vorschubänderung Γ der Ablaufrolle 7 von einer mittleren Geschwindigkeit direkt proportional den Spannungsänderungswerten, wie sie beim ersten "Probeumlauf" gefunden werden. Unmittelbar nach dem ersten Umlauf wird der Tastarm 10 aus dem Kontaktbereich mit dem Folienband 3 herausgeschwenkt in die Stellung E. Es sei aber nicht ausgeschlossen, daß der Tastarm noch in Kontakt verbleibt und beispielsweise dazu benutzt wird, unerwartete Änderungen oder gröbere Fehler festzustellen, beispielsweise Riß des Folienbandes oder unerwartete Spannungserhöhung, beispielsweise durch Auswanderung des Packstückes 1 aus dem Koordinatenkreuz, wie in Figur 2 festgelegt. Wesentlich ist, daß die Drehgeschwindigkeit der Ablaufrolle 7 der Wertesequenz folgend in sehr kleinen Inkrementen steuerbar ist und damit dafür sorgt, daß die Spannung des Folienbandes genau eingehalten wird. Hierbei können auch sehr unregelmäßige Querschnitte, beispielsweise ein Kasten mit überstehenden Flaschenhälsen, wie er als Packstück 1 dargestellt ist, erfaßt werden.The lower part of FIG. 2 shows such a diagram. This results in a value sequence of, for example, 1024 values which are obtained in one revolution of the winding device. This sequence of values is stored in an electronic data memory. Then the rotational speed of the winding device 5 accelerates and the package 1 is advanced through the roller guide device. In this case, the sequence of values standardized from the data memory mentioned is used sequentially to control the rotational speed of the idler roller 7. As already said at the beginning, the percentage change in feed rate Γ of the idler roller 7 from an average speed is directly proportional to the voltage change values as found during the first "test run". Immediately after the first revolution, the probe arm 10 is pivoted out of the contact area with the film strip 3 into position E. However, it should not be excluded that the probe arm remains in contact and is used, for example, to detect unexpected changes or major errors, for example a crack of the film strip or an unexpected increase in tension, for example by emigration of the package 1 from the coordinate cross, as defined in FIG. 2. It is essential that the rotational speed of the idler roller 7 can be controlled in very small increments following the sequence of values and thus ensures that the tension of the film strip is exactly maintained. Very irregular cross sections, for example a box with protruding bottle necks, as shown as package 1, can also be detected here.

Es ist auch möglich, jeweils zu Beginn eines neuen Packstückes oder in der Mitte von längeren Packstücken erneut eine Wertesequenz aufzunehmen, um diese dann den weiteren Wickelumläufen zugrunde zu legen. Demnach ist es für das vorliegende Verfahren auch mölich, jeweils nicht genau im Ursprung des Koordinatenkreuzes liegende Packstücke zu erfassen, da die Wertesequenz jeweils unabhängig von der auf einen Mittelpunkt bezogenen Kontur des Packstückes ermittelt wird.It is also possible to record a value sequence again at the beginning of a new package or in the middle of longer packages in order to then base this on the further winding cycles. Accordingly, it is also possible for the present method not to lie exactly in the origin of the coordinate cross To record packages, since the value sequence is determined independently of the contour of the package related to a center point.

In der Zeichnung ist der Datenspeicher 15 nur schematisch dargestellt. Derartige Datenspeicher sind delbstverständlich aus der elektronischen Datenverarbeitung bekannt. Es soll aber nicht ausgeschlossen werden, daß sich als Datenspeicher beispielsweise auch Lochstreifen oder dergleichen eignen. Wesentlich ist weiterhin, daß die Ablaufrolle 7 und die Zulaufrolle 8 derart miteinander gekoppelt sind, daß ein festes Drehzahlverhältnis der beiden Rollen zur Erzeugung einer Foliendehnung zwischen den beiden Rollen erzeugbar ist. Derartige Reckwerke sind jedoch an sich bekannt, lassen sich jedoch in vorteilhafter Weise in eine Vorrichtung der vorgenannten Art integrieren.In the drawing, the data memory 15 is only shown schematically. Such data memories are of course known from electronic data processing. However, it should not be ruled out that paper tape or the like, for example, are also suitable as data memories. It is also essential that the discharge roller 7 and the feed roller 8 are coupled to one another in such a way that a fixed speed ratio of the two rollers can be generated to produce a film stretch between the two rollers. However, such stretching mechanisms are known per se, but can advantageously be integrated into a device of the aforementioned type.

Die jeweils zu verwendenden Umdrehungszahlen sind abhängig von der Art und Qualität des Folienbandes 3. Dessen Parameter, wie beispielsweise Elastizitätsmodul, Reckfähigkeit, Rückstellkraft und dergleichen sind selbstverständlich in allen Einzelheiten bekannt und können daher mit wenigen empirischen Versuchen für das vorgenannte Verfahren umgesetzt werden in eine Abhängigkeitskurve
Γ = f (Φ).The number of revolutions to be used in each case depends on the type and quality of the film strip 3. Its parameters, such as, for example, modulus of elasticity, stretchability, restoring force and the like, are of course known in every detail and can therefore be converted into a dependency curve with a few empirical tests for the aforementioned method
Γ = f (Φ).

Das Verfahren kann vorteilhafterweise auch dadurch abgewandelt werden, daß die für die Steuerung der Ablaufrolle (7) benötigte Wertesequenz nach Eingabe von bekannten, z. B. früher gemessenen Packstückabmessungen, z. B. über eine Tastatur in die Maschinensteuerung von dieser errechnet, in einen Datenspeicher gespeichert und zur Steuerung der Umbrehungsgeschwindigkeit der Ablaufrolle verwendet wird. Derartige Packstückabmessungen können beispielsweise auch durch berührungslos arbeitende Meßeinrichtungen aufgenommen werden.The method can advantageously also be modified in that the value sequence required for controlling the roller (7) after input of known, e.g. B. previously measured package dimensions, e.g. B. calculated from a keyboard in the machine control of this, stored in a data memory and used to control the speed of rotation of the idler. Such package dimensions can also be recorded, for example, by non-contact measuring devices.

Claims (6)

Verfahren zum Wickeln einer Folienbahn um ein Packstück, das einen Querschnitt besitzt, der während des Wickelns Änderungen in der zeitlich benötigten Länge an Folienbahn hervorruft, mit einer um das Packstück rotierenden Wickelvorrichtung, die wenigstens eine Ablaufrolle umfaßt, die entsprechend einer dem Querschnitt des Packstücks entsprechenden Wertesequenz in ihrer Drehzahl steuerbar ist und die zeitlich benötigte Länge an Folienbahn gesteuert abgibt, dadurch gekennzeichnet, daß die für die Steuerung der Ablaufrolle (7) benötigte Wertesequenz in wenigstens einem ersten Umlauf der Wickelvorrichtung (5) mittels Spannungsmessung an der Folienbahn stromab zur Ablaufrolle (7) in Abhängigkeit von der Winkelstellung Φ der Wickelvorrichtung (5) ermittelt wird, in einem Datenspeicher (15) gespeichert und entsprechend normiert zur Steuerung der Umdrehungsgeschwindigkeit der Ablaufrolle (7) verwendet wird.Method for winding a film web around a package, which has a cross-section that causes changes in the length of film web required in time during the winding, with a winding device rotating around the package, which comprises at least one unwinding roller which corresponds to a cross-section corresponding to the cross-section of the package The speed of the value sequence can be controlled and the length of time required to control the film web is controlled, characterized in that the value sequence required for controlling the unwinding roll (7) is carried out in at least one first revolution of the winding device (5) by means of tension measurement on the film web downstream of the unwinding roll ( 7) is determined as a function of the angular position Φ of the winding device (5), stored in a data memory (15) and used in a correspondingly standardized manner to control the rotational speed of the roller (7). Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der oder die zur Ermittlung der Wertesequenz erfolgenden Umläufe mit geringerer Winkelgeschwindigkeit als die Wickelumläufe im Betriebszustand erfolgen.A method according to claim 1, characterized in that the or the revolutions to determine the value sequence take place at a lower angular speed than the winding revolutions in the operating state. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 oder 2, mit einer steuerbar angetriebenen Ablaufrolle (7) und einer Vorrichtung zu Erzeugung einer Wertesequenz für die Steuerung der Ablaufrollen-Drehgeschwindigkeit, dadurch gekennzeichnet, daß stromab zur Ablaufrolle (7) ein das Folienband (3) kontaktierender Spannungstaster (9, 10) angebracht ist, der mittels Signalwandler die bei Umlauf der Ablaufrolle auftretenden Spannungen als Wertesequenz in Abhängigkeit vom Umlaufwinkel Φ erfaßt,sowie mit einem Datenspeicher (15), der die Wertesequenz speichert und im Betriebszustand als die Ablaufrollen-Drehgeschwindigkeit steuernde normierte Signale abgibt.Apparatus for carrying out the method according to claim 1 or 2, with a controllably driven unwinding roller (7) and a device for generating a value sequence for controlling the unwinding roller rotation speed, characterized in that downstream of the unwinding roller (7) a film strip (3) Contacting voltage button (9, 10) is attached, which detects by means of a signal converter the voltages occurring when the idler roller rotates as a value sequence as a function of the rotation angle Φ, and with a data memory (15) which stores the value sequence and, in the operating state, emits standardized signals which control the roller speed. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die für die Steuerung der Ablaufrolle (7) benötigte Wertesequenz nach Eingabe von Packstückabmessungen, z. B. über eine Tastatur, in die Vorrichtung zur Erzeugung der Wertefrequenz von dieser errechnet, im Datenspeicher (15) gespeichert und zur Steuerung der Umdrehungsgeschwindigkeiten der Ablaufrolle (7) verwendet wird.Apparatus according to claim 3, characterized in that the value sequence required for controlling the discharge roller (7) after input of package dimensions, e.g. B. on a keyboard, calculated in the device for generating the value frequency of this, stored in the data memory (15) and used to control the rotational speeds of the roller (7). Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Packstückabmessungen von bekannten berührungslos arbeitenden Meßeinrichtungen aufgenommen werden.Apparatus according to claim 3, characterized in that the package dimensions are recorded by known non-contact measuring devices. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Spannungstaster (9, 10) in eine kontaktfreie Stellung verfahrbar ist.Apparatus according to claim 3, characterized in that the voltage button (9, 10) can be moved into a contact-free position.
EP90122717A 1989-12-19 1990-11-28 Method and device for winding webs Ceased EP0433718A1 (en)

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