EP0365470A2 - Device for attaching the trailing end of a web to the leading end of another web - Google Patents

Device for attaching the trailing end of a web to the leading end of another web Download PDF

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Publication number
EP0365470A2
EP0365470A2 EP89810699A EP89810699A EP0365470A2 EP 0365470 A2 EP0365470 A2 EP 0365470A2 EP 89810699 A EP89810699 A EP 89810699A EP 89810699 A EP89810699 A EP 89810699A EP 0365470 A2 EP0365470 A2 EP 0365470A2
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EP
European Patent Office
Prior art keywords
band
drive
web
vas
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.)
Granted
Application number
EP89810699A
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German (de)
French (fr)
Other versions
EP0365470A3 (en
EP0365470B1 (en
Inventor
Thomas Schenker
Horst Loewenthal
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Schweizerische Industrie Gesellschaft
Original Assignee
Schweizerische Industrie Gesellschaft
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Publication of EP0365470A2 publication Critical patent/EP0365470A2/en
Publication of EP0365470A3 publication Critical patent/EP0365470A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1857—Support arrangement of web rolls
    • B65H19/1873—Support arrangement of web rolls with two stationary roll supports carrying alternately the replacement and the expiring roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1842—Attaching, e.g. pasting, the replacement web to the expiring web standing splicing, i.e. the expiring web being stationary during splicing contact
    • B65H19/1852—Attaching, e.g. pasting, the replacement web to the expiring web standing splicing, i.e. the expiring web being stationary during splicing contact taking place at a distance from the replacement roll
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/46—Splicing
    • B65H2301/463—Splicing splicing means, i.e. means by which a web end is bound to another web end
    • B65H2301/4634—Heat seal splice

Definitions

  • the present invention relates to a device for connecting the end of a band to the beginning of another band according to the preamble of claim 1.
  • Devices of this type are used in packaging machines in order to connect the end of a wrapping material strip running from a supply roll to the beginning of a wrapping material strip running from a second supply roll while maintaining predetermined distances from centering marks applied to the wrapping materials.
  • the invention has for its object to improve a device of the type mentioned in such a way that a precisely centered splicing is possible, even with high machine performance.
  • the packaging machine according to FIG. 1 is provided with a first supply roll 1, from which a tape or a film 2 is unwound, via a roll system 3, a splicing roll 4, a guide roll 5, a drive roll 6, a film storage roll 7 and two further guide rolls 8 and 9 is fed to a folding box 10 by pulling the film 2 formed into a tube through a roller feed 11.
  • a loading device 12 In front of the folding box 10 there is a loading device 12, through which the goods to be packaged are introduced into the film tube, which is closed at regular intervals by a transverse heater 13, at the exit of which an outlet device 14 is provided in order to remove the packaged and closed goods.
  • the roller feed 11 is driven by the drive or motor 31 of a first servo device 15 and the drive roller 6 by the drive or motor 41 of a second servo device device 16 driven.
  • the servo devices 15 and 16 are connected to a processor, not shown in the figure. They can be constructed similarly and each have an amplifier 32 or 42, a tachometer 33 or 43 and an angle sensor 34 or 44.
  • a splicer device 21 is provided, which presses the splicer rollers 4 and 20 against one another in order to connect the end of the film 2 to the beginning of the film 18, and the film storage roller 7 is movably integrated into a device 22 via a rocker arm 71 to be able to change the length of the film loop.
  • buttons 23 to 29 are also provided for various control and monitoring purposes.
  • the packaging machine according to FIG. 1 works as follows:
  • the film limit switch 23 detects the point in time at which the end of the film 2 passes a certain point in the roller system and supplies a signal a to the processor which, on the basis of this signal and other parameters, generates a control signal Vas for the servo device 16 by the speed v of the motor 41 normalized according to that in FIG. 2 shown function v (t) to change.
  • the speeds are the two Parts of the film the same.
  • FIG. 4 shows the equivalent circuit diagram 45 of the processor for the normal operation of the servo devices 15 (master) and 16 (slave).
  • the processor performs the following operations:
  • p and q are parameters with the dimension s ⁇ 1.
  • FIG. 5 shows the equivalent circuit diagram of the processor for the special case of speed reduction for the splicing process.
  • the processor causes the following operations to be performed:
  • the sum of the signal da and the output signal V'as of a multiplier 52 is formed in an adding circuit 55, in which a multiplication of the output signals z and v of the circuit 51 or the device 15 takes place.
  • the output signal Vas of the circuit 55 is fed to the device 16, which also supplies the signal va.
  • FIG. 7 the elements 2, 4, 20, 23 and 27 of FIG. 1 are again shown schematically and some marks of the film 2 are numbered 0, 1, 2, ... 10.
  • the distance LV between the sensor point A of the membrane switch 23 and the splice point B between the splice rollers 4 and 20 and the distance LM between the point B and the sensor point C of the button 27 is given by the geometry of the system.
  • the button 23 therefore recognizes the end of the film at point A and accordingly emits the signal a.
  • the button 27 constantly monitors the marks and generates a signal b when a mark passes.
  • the summand LR is chosen at discretion, for example smaller than a brand section.
  • the processor first determines the number of entire mark sections on the path x thus defined, which results in the current position of mark 1; it then calculates both the number of marks up to the beginning of the speed reduction and the corresponding phase shift of the motor 41, which is done with the aid of the signal va (FIG. 1), as well as the number of marks up to the splice torque and the corresponding phase shift of the motor 41.
  • the distance DB corresponds to two and a half mark sections, for example, and the speed reduction begins when the mark 1 passes the point D.
  • the splicing moment at which the end of the prepared film 18 (FIG. 1) is connected to the leading end of the old film 2 corresponds to the passage of the mark 1 at point B, at which the speed of the film is zero for a moment .
  • the splicing according to this method can also be set in such a way that the trigger length is determined by determining the distance between two centering marks, which can be carried out, for example, by the interaction of an optical button and an incremental encoder, a trigger length corresponding to the centering mark distance.
  • first and / or the second motor can be DC servomotors with a tachometer generator and incremental encoder as well as AC servomotors with a resolver, for example, which are very dynamic and provide information about the absolute angle.
  • Other drives can also be used otherwise.
  • the integration which is carried out by the integrator 49 of the equivalent circuit diagram according to FIG. 4, or the subtraction, which is carried out by the subtractor 48, actually takes place physically in the device 22.

Abstract

The device for attaching the trailing end of a web (2) to the leading end of another web (18) in a packaging machine has a first servo device (15) with a motor (31) for driving the web (2) running off roll (1) and a second servo device (16) with a motor (41) for backup driving of the web (2), a buffering device (22) compensating the differences in speed which the web (2) may exhibit before or after it, seen in the direction of flow. The second servo device (16) is controlled by a control signal Vas, which is supplied by a computer, in order to effect a reduction of the web speed to zero at a given moment, and thereby facilitate the attaching of the two web ends. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum Verbin­den des Endes eines Bandes mit dem Anfang eines anderen Bandes gemäss dem Oberbegriff des Patentanspruchs 1.The present invention relates to a device for connecting the end of a band to the beginning of another band according to the preamble of claim 1.

Derartige Vorrichtungen werden in Verpackungsmaschinen einge­setzt, um das Ende eines von einer Vorratsrolle ablaufenden Einschlagmaterialbandes mit dem Anfang eines von einer zweiten Vorratsrolle ablaufenden Einschlagmaterialbandes unter Einhal­tung vorbestimmter Abstände von auf den Einschlagmaterialien aufgebrachten Zentriermarken zu verbinden.Devices of this type are used in packaging machines in order to connect the end of a wrapping material strip running from a supply roll to the beginning of a wrapping material strip running from a second supply roll while maintaining predetermined distances from centering marks applied to the wrapping materials.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art derart zu verbessern, dass ein genau zentriertes Spleissen, auch bei hoher Maschinenleistung, mög­lich ist.The invention has for its object to improve a device of the type mentioned in such a way that a precisely centered splicing is possible, even with high machine performance.

Diese Aufgabe wird erfindungsgemäss durch eine Vorrichtung mit den im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Merkmalen gelöst.This object is achieved according to the invention by a device with the features specified in the characterizing part of patent claim 1.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen angegeben.Further advantageous embodiments of the invention are specified in the dependent claims.

Die Erfindung wird nachfolgend an Ausführungsbeispielen an­hand der beigefügten Zeichnung näher erläutert. In der Zeich­nung zeigt

  • Fig. 1 eine schematische Darstellung einer Verpackungsma­schine mit einer Vorrichtung nach der Erfindung,
  • Fig. 2 ein Diagramm mit einer ersten Variante für den Ge­schwindigkeitsverlauf des gesteuerten Motors einer solchen Vorrichtung,
  • Fig. 3 ein Diagramm zur Veranschaulichung der verschiedenen Längen, die die Bandschleife in einer Puffervorrich­tung aufweisen kann nach Massgabe der unterschiedli­chen Geschwindigkeit des Bandes vor und nach dieser Puffervorrichtung,
  • Fig. 4 das Ersatzschaltbild eines Prozessors für den Nor­malbetrieb der Servoeinrichtungen der erfindungsge­mässen Vorrichtung,
  • Fig. 5 das Ersatzschaltbild des Prozessors für den Spezial­betrieb dieser Servoeinrichtungen während der Zeit, in der das Verbinden der Bänder stattfindet,
  • Fig. 6 ein Diagramm mit einem anderen Geschwindigkeitsver­lauf des gesteuerten Motors einer solchen Vorrichtung, und
  • Fig. 7 eine schematische Darstellung zur Erläuterung der Arbeitsweise der Vorrichtung, um einen vorgegebenen Markenabstand auf der Verbindungsstelle des Bandes einzuhalten.
The invention is explained in more detail below using exemplary embodiments with reference to the accompanying drawing. In the drawing shows
  • 1 is a schematic representation of a packaging machine with a device according to the invention,
  • 2 shows a diagram with a first variant for the speed profile of the controlled motor of such a device,
  • 3 shows a diagram to illustrate the different lengths that the belt loop can have in a buffer device in accordance with the different speed of the belt before and after this buffer device,
  • 4 shows the equivalent circuit diagram of a processor for the normal operation of the servo devices of the device according to the invention,
  • 5 shows the equivalent circuit diagram of the processor for the special operation of these servo devices during the time in which the bands are connected,
  • 6 shows a diagram with another speed profile of the controlled motor of such a device, and
  • Fig. 7 is a schematic representation for explaining the operation of the device in order to maintain a predetermined mark distance on the connection point of the tape.

Die Verpackungsmaschine nach Fig. 1 ist mit einer ersten Vor­ratsrolle 1 versehen, von der ein Band oder eine Folie 2 ab­gewickelt wird, die über ein Rollensystem 3, eine Spleisser­rolle 4, eine Führungsrolle 5, eine Antriebsrolle 6, eine Folienspeicherrolle 7 und zwei weitere Führungsrollen 8 und 9 einem Faltkasten 10 zugeführt wird, indem die zu einem Schlauch geformte Folie 2 durch einen Rollenvorschub 11 abgezogen wird. Vor dem Faltkasten 10 befindet sich eine Ladeeinrichtung 12, durch die das zu verpackende Gut in den Folienschlauch eingeführt wird, der in regelmässigen Ab­ständen durch eine Querheizung 13 verschlossen wird, an deren Ausgang eine Auslaufeinrichtung 14 vorgesehen ist, um das verpackte und geschlossene Gut abzutransportieren.The packaging machine according to FIG. 1 is provided with a first supply roll 1, from which a tape or a film 2 is unwound, via a roll system 3, a splicing roll 4, a guide roll 5, a drive roll 6, a film storage roll 7 and two further guide rolls 8 and 9 is fed to a folding box 10 by pulling the film 2 formed into a tube through a roller feed 11. In front of the folding box 10 there is a loading device 12, through which the goods to be packaged are introduced into the film tube, which is closed at regular intervals by a transverse heater 13, at the exit of which an outlet device 14 is provided in order to remove the packaged and closed goods.

Der Rollenvorschub 11 wird durch den Antrieb oder Motor 31 einer ersten Servoeinrichtung 15 und die Antriebsrolle 6 durch den Antrieb oder Motor 41 einer zweiten Servoeinrich­ tung 16 angetrieben. Die Servoeinrichtungen 15 und 16 sind an einen in der Figur nicht dargestellten Prozessor ange­schlossen. Sie können ähnlich aufgebaut sein und je einen Verstärker 32 bzw. 42, einen Tachometer 33 bzw. 43 und einen Winkelgeber 34 bzw. 44 aufweisen.The roller feed 11 is driven by the drive or motor 31 of a first servo device 15 and the drive roller 6 by the drive or motor 41 of a second servo device device 16 driven. The servo devices 15 and 16 are connected to a processor, not shown in the figure. They can be constructed similarly and each have an amplifier 32 or 42, a tachometer 33 or 43 and an angle sensor 34 or 44.

Die Verpackungsmaschine nach Fig. 1 ist ebenfalls mit einer zweiten Vorratsrolle 17 versehen, von der ein Band oder eine Folie 18 abgewickelt werden kann, sobald die Vorratsrolle 1 leer ist. Zu diesem Zweck ist eine Spleisservorrichtung 21 vorgesehen, die die Spleisserrollen 4 und 20 gegeneinander drückt, um das Ende der Folie 2 mit dem Anfang der Folie 18 zu verbinden, und die Folienspeicherrolle 7 ist über einen Schwinghebel 71 beweglich in eine Vorrichtung 22 integriert, um die Länge der Folienschleife ändern zu können. Es sind zudem mehrere Taster 23 bis 29 für verschiedene Steuer- und Kontrollzwecke vorgesehen.1 is also provided with a second supply roll 17, from which a tape or a film 18 can be unwound as soon as the supply roll 1 is empty. For this purpose, a splicer device 21 is provided, which presses the splicer rollers 4 and 20 against one another in order to connect the end of the film 2 to the beginning of the film 18, and the film storage roller 7 is movably integrated into a device 22 via a rocker arm 71 to be able to change the length of the film loop. There are also several buttons 23 to 29 provided for various control and monitoring purposes.

Die Verpackungsmaschine nach Fig. 1 funktioniert folgender­massen:
Der Folienendtaster 23 detektiert den Zeitpunkt, in dem das Ende der Folie 2 an einer bestimmten Stelle des Rollensystems vorbeigeht, und liefert ein Signal a an den Prozessor, der aufgrund dieses Signals und anderer Parameter ein Steuer­signal Vas für die Servoeinrichtung 16 erzeugt, um die Ge­schwindigkeit v des Motors 41 gemäss der in Fig. 2 normiert dargestellten Funktion v(t) zu ändern. Zwischen der normier­ten Zeit 0 und π wird die Geschwindigkeit v(t) = x von x = 1 bis x = 0 reduziert, so dass im Zeitpunkt π die Folie 2 im Bereich der Spleisserrollen 4 und 20 für einen Moment stillsteht, um ein Verbinden oder Schweissen des Endes der Folie 2 mit dem Anfang der Folie 18 zu erleichtern. Danach wird die Geschwindigkeit x erhöht, um beispielsweise im Zeitpunkt 2π wieder die normierte Geschwindigkeit x = 1 zu haben. Dadurch entsteht eine Wegdifferenz L zwischen den zu­rückgelegten Strecken der Folie im Teil vor und nach der Antriebsrolle 6, da der untere Teil der Folie mit der kon­stanten normierten Geschwindigkeit v = 1 weiterläuft. Diese Wegdifferenz L wird durch die bewegliche Folienspeicherrolle 7 aufgenommen, weil durch die Bewegung des Schwinghebels 71 die Länge der unteren Schleife während der Zeit 0 bis 2π (Fig. 2) um den Betrag L kürzer wird. Nach dem Zeitpunkt t = 2π kann die Geschwindigkeit v der Antriebsrolle 6 bei­spielsweise auf v = 1,5 für eine weitere Zeit T = 2π er­höht werden, um die Wegdifferenz L zu kompensieren und die untere Schleife um diesen Betrag L zu verlängern, derart, dass im Zeitpunkt t = 4π beide Folienteile mit derselben normierten Geschwindigkeit v = 1 abgewickelt werden.The packaging machine according to FIG. 1 works as follows:
The film limit switch 23 detects the point in time at which the end of the film 2 passes a certain point in the roller system and supplies a signal a to the processor which, on the basis of this signal and other parameters, generates a control signal Vas for the servo device 16 by the speed v of the motor 41 normalized according to that in FIG. 2 shown function v (t) to change. Between the normalized time 0 and π, the speed v (t) = x is reduced from x = 1 to x = 0, so that at the time π the film 2 stands still for a moment in the area of the splicer rollers 4 and 20 in order to connect or Welding the end of the film 2 with the beginning of the film 18 to facilitate. Then the speed x is increased, for example to have the normalized speed x = 1 again at the time 2π. This creates a path difference L between the distances covered by the film in the part before and after the drive roller 6, since the lower part of the film continues to run at the constant normalized speed v = 1. This path difference L is taken up by the movable film storage roller 7 because the length of the lower loop becomes shorter by the amount L during the time 0 to 2π (FIG. 2) due to the movement of the rocker arm 71. After the time t = 2π, the speed v of the drive roller 6 can be increased, for example, to v = 1.5 for a further time T = 2π in order to compensate for the path difference L and to extend the lower loop by this amount L, in such a way that at the time t = 4π both film parts are processed with the same normalized speed v = 1.

Die Gerade S in Fig. 3 veranschaulicht eine vom unteren Teil der Folie 1 zurückgelegte Strecke, wobei wegen der Normierung S = t ist. Im Normalfall sind die Geschwindigkeiten der beiden Teile der Folie gleich. Beim Spleissen wird die Geschwindig­keit v = x des oberen Folienteils derart reduziert, dass dessen zurückgelegte Strecke Sx ist. Aus Fig. 3 ist die Konstanz der Funktion Sx(t) im Punkt t = π entsprechend dem bewirkten Stillstand ersichtlich.The straight line S in FIG. 3 illustrates a distance traveled from the lower part of the film 1, with S = t because of the normalization. Usually the speeds are the two Parts of the film the same. During splicing, the speed v = x of the upper film part is reduced in such a way that its distance covered is Sx. 3 shows the constancy of the function Sx (t) at the point t = π corresponding to the standstill brought about.

Als Beispiel sei die Funktion
x = (1 + cos t)/2 = v(t)
für die normierte Geschwindigkeit angenommen (Fig. 2). Daraus ergibt sich für die Strecke Sx durch Integration
Sx = ∫x.dt = ∫(1 + cos t)/2.dt
= 0,5.t + 0,5.sin t
gültig im Bereich 0 bis 2π.The function is an example
x = (1 + cos t) / 2 = v (t)
assumed for the normalized speed (Fig. 2). For the distance Sx this results from integration
Sx = ∫x.dt = ∫ (1 + cos t) /2.dt
= 0.5.t + 0.5.sin t
valid in the range 0 to 2π.

Für t = 2π gilt Sx = π      (Punkt A).For t = 2π, Sx = π (point A) applies.

Es gelte im Bereich 2π bis 4π die Funktion v = 1,5 (konstant). Daraus ergibt sich für die Strecke Sx durch In­tegration
S′x = ∫1,5.dt = 1,5 t
so dass für t = 4π gilt S′x = 3π      (Punkt B).The function v = 1.5 (constant) applies in the range 2π to 4π. For the distance Sx this results from integration
S′x = ∫1.5.dt = 1.5 t
so that for t = 4π, S′x = 3π (point B).

Selbstverständlich können auch ganz andere Funktionen für die Geschwindigkeit v gewählt werden, die für eine kurze Zeit einen Stillstand der Folie bewirken.Of course, completely different functions can also be selected for the speed v, which bring the film to a standstill for a short time.

Es ist ferner zu bemerken, dass wegen
∫

Figure imgb0001
(1 - x)dt = 0,5.
∫(1 - cos t)dt = π
die Flächen F1 und F2 in Fig. 2 gleich sind, das heisst F1 = F2.It should also be noted that because of
∫
Figure imgb0001
(1 - x) dt = 0.5.
∫ (1 - cos t) dt = π
the areas F1 and F2 in FIG. 2 are the same, that is, F1 = F2.

In Fig. 4 ist das Ersatzschaltbild 45 des Prozessors für den Normalbetrieb der Servoeinrichtungen 15 (Master) und 16 (Slave) dargestellt. In dieser Figur haben die Signale v, Whs, va, vh, wh und Vas folgende Bedeutung:
Whs = Soll-Verschiebung des Schwinghebels 71 der Vorrich­tung 22,
v = Ist-Geschwindigkeit der Folie beim Rollenvorschub 31,
va = Ist-Geschwindigkeit der Folie beim Antrieb 41 (Fig. 1),
vh = äquivalente Ist-Geschwindigkeitskomponente der Folie bei Winkeländerungen des Schwinghebels,
wh = Ist-Verschiebung des Schwinghebels 71,
Vas = Soll-Geschwindigkeit der Folie beim Antrieb 41.4 shows the equivalent circuit diagram 45 of the processor for the normal operation of the servo devices 15 (master) and 16 (slave). In this figure, the signals v, Whs, va, vh, wh and Vas have the following meaning:
Whs = target displacement of the rocker arm 71 of the device 22,
v = actual speed of the film at roll feed 31,
va = actual speed of the film in drive 41 (FIG. 1),
vh = equivalent actual speed component of the film when the rocker arm changes in angle,
wh = actual displacement of the rocker arm 71,
Vas = target speed of the film for drive 41.

Der Prozessor bewirkt die Abwicklung folgender Operationen:
Das Ausgangssignal v der Servoeinrichtung 15 wird einem Sub­trahierer 47 zugeführt, der die Differenz Vas = v-p.dh bil­det, worin p ein Parameter und dh das Ausgangssignal eines weiteren Subtrahierers 46 ist, in dem die Differenz dh = wh - Whs gebildet wird.The processor performs the following operations:
The output signal v of the servo device 15 is fed to a subtractor 47 which forms the difference Vas = vp.dh, where p is a parameter and that is the output signal of a further subtractor 46 in which the difference dh = wh-Whs is formed.

Das Signal wh wird von einem Integrator 49 geliefert, der eingangsseitig mit dem Ausgangssignal vh = va - v eines weiteren Subtrahierers 48 beaufschlagt wird, der das Signal va von der Servoeinrichtung 16 (Slave) erhält, die ihrerseits vom Signal Vas gesteuert wird.The signal wh is supplied by an integrator 49 which is acted upon on the input side by the output signal vh = va - v from a further subtractor 48 which receives the signal va from the servo device 16 (slave), which in turn is controlled by the signal Vas.

Es gilt somit:
Vas + q.∫(va - v)dt = v + p.Whs.
Daraus ergibt sich, dass ein Stillstand der Vorrichtung 41 möglich ist, weil für Vas = 0 die Maschine weiter funktionie­ren kann, auch wenn v verschieden von null ist. In dieser Gleichung sind p und q Parameter mit der Dimension s⁻¹.The following therefore applies:
Vas + q.∫ (va - v) dt = v + p.Whs.
It follows from this that the device 41 can stand still because the machine can continue to function for Vas = 0, even if v is different from zero. In this equation, p and q are parameters with the dimension s⁻¹.

In Fig. 5 ist das Ersatzschaltbild des Prozessors für den Sonderfall der Geschwindigkeitsabsenkung für den Spleiss­prozess dargestellt. In dieser Figur haben die zusätzlichen Signale Was, wa und wr folgende Bedeutung:
Was = mSoll-Winkel des Antriebs 41
wa = Ist-Winkel des Antriebs 41
wr = Ist-Winkel des Antriebs 31.5 shows the equivalent circuit diagram of the processor for the special case of speed reduction for the splicing process. In this figure, the additional signals What, wa and wr have the following meaning:
What = mset angle of drive 41
wa = actual angle of drive 41
wr = actual angle of drive 31.

Der Prozessor bewirkt, dass folgende Operationen durchgeführt werden:
Das Ausgangssignal wr der Servoeinrichtung 15 wird sowohl einer Geschwindigkeitskorrekturschaltung 51 als auch einer Phasenkorrekturschaltung 53 zugeführt, mit deren Ausgangs­ signal Was ein Subtrahierer 54 beaufschlagt wird, um die Differenz da = Was - wa zu bilden, wobei das Signal wa von der Servoeinrichtung 16 geliefert wird. In einer Addierschal­tung 55 wird die Summe des Signals da und des Ausgangssignals V′as eines Multiplizierers 52 gebildet, in dem eine Multi­plikation der Ausgangssignale z und v der Schaltung 51 bzw. der Vorrichtung 15 stattfindet. Das Ausgangssignal Vas der Schaltung 55 wird der Vorrichtung 16 zugeführt, die auch das Signal va liefert.The processor causes the following operations to be performed:
The output signal wr of the servo device 15 is supplied to both a speed correction circuit 51 and a phase correction circuit 53, with their output signal What is applied to a subtractor 54 to form the difference da = Was - wa, the signal wa being supplied by the servo device 16. The sum of the signal da and the output signal V'as of a multiplier 52 is formed in an adding circuit 55, in which a multiplication of the output signals z and v of the circuit 51 or the device 15 takes place. The output signal Vas of the circuit 55 is fed to the device 16, which also supplies the signal va.

Es gilt somit
Vas = Was - wa + v.z
mit v = x.So it applies
Vas = What - wa + vz
with v = x.

Die Schaltungen 53 und 51 transformieren das Signal wr in Was = f.Sx (vgl. Fig. 3) bzw. in z = g.x (vgl. Fig. 2), wo­rin f und g Parameter sind.The circuits 53 and 51 transform the signal wr into What = f.Sx (see FIG. 3) and z = g.x (see FIG. 2), where f and g are parameters.

Daraus ergibt sich
Vas = f.0,5.(t + sin t) - wa + g.0,25.(1 + cos t)²
und da bei t + Δt = π + Δt einerseits 1 + cos t ≅ 0 und andererseits sin t ≅ - Δt ist, resultiert für t ≅ π
Vas = 0,5.f.(π + Δt - Δt) - wa.
Dies bedeutet, dass für 2.wa = f.π die Soll-Geschwindigkeit der Folie beim Antrieb 41 null ist.This results in
Vas = f.0.5. (T + sin t) - wa + g.0.25. (1 + cos t) ²
and since t + Δt = π + Δt is 1 + cos t ≅ 0 on the one hand and sin t ≅ - Δt on the other hand, this results in t ≅ π
Vas = 0.5.f. (Π + Δt - Δt) - wa.
This means that for 2.wa = f.π the target speed of the film for drive 41 is zero.

Fig. 6 zeigt, dass die Funktion v(t) nach Ermessen bestimmt und die Geschwindigkeit v auch für eine vorgegebene Zeit GH gleich null gehalten werden kann.6 shows that the function v (t) is determined at the discretion and the speed v can also be kept equal to zero for a predetermined time GH.

In Fig. 7 sind die Elemente 2, 4, 20, 23 und 27 von Fig. 1 nochmals schematisch dargestellt und einige Marken der Folie 2 mit 0, 1, 2, ... 10 numeriert. Der Abstand LV zwischen dem Sensorpunkt A des Folientasters 23 und der Spleissstelle B zwischen den Spleisserrollen 4 und 20 sowie der Abstand LM zwischen dem Punkt B und dem Sensorpunkt C des Tasters 27 ist jeweils von der Geometrie des Systems gegeben. Der Taster 23 erkennt daher das Folienende beim Punkt A und gibt dem­entsprechend das Signal a ab. Der Taster 27 überwacht ständig die Marken und erzeugt jeweils ein Signal b, wenn eine Marke vorbeigeht. Mit Hilfe der Signale a und b bestimmt der Pro­zessor den Abstand LX zwischen der Marke 8 und dem Punkt C, wenn sich das Ende der Folie 2 beim Punkt A befindet; der Prozessor berechnet auch die Strecke
x = LX + LV + LM - LR
worin LR ein Sicherheitssummand ist, mit dem man den Fall be­rücksichtigen möchte, dass die Folie 2 am Ende einen Riss aufweist. Dabei wird der Summand LR nach Ermessen, beispiels­weise kleiner als ein Markenabschnitt gewählt.In FIG. 7 the elements 2, 4, 20, 23 and 27 of FIG. 1 are again shown schematically and some marks of the film 2 are numbered 0, 1, 2, ... 10. The distance LV between the sensor point A of the membrane switch 23 and the splice point B between the splice rollers 4 and 20 and the distance LM between the point B and the sensor point C of the button 27 is given by the geometry of the system. The button 23 therefore recognizes the end of the film at point A and accordingly emits the signal a. The button 27 constantly monitors the marks and generates a signal b when a mark passes. With the aid of signals a and b, the processor determines the distance LX between mark 8 and point C when the end of film 2 is at point A; the processor also calculates the route
x = LX + LV + LM - LR
where LR is a security summand with which one would like to take into account the case where the film 2 has a crack at the end. The summand LR is chosen at discretion, for example smaller than a brand section.

Der Prozessor bestimmt zunächst die Anzahl ganzer Markenab­schnitte auf der so definierten Strecke x, was die momentane Position der Marke 1 ergibt; er berechnet dann sowohl die Anzahl Marken bis zum Beginn der Geschwindigkeitsabsenkung sowie die entsprechende Phasenverschiebung des Motors 41, was mit Hilfe des Signals va (Fig. 1) geschieht, als auch die Anzahl Marken bis zum Spleissmoment sowie die entspre­chende Phasenverschiebung des Motors 41. Im Beispiel nach Fig. 7 gibt es zwei Marken 6 und 7 bis zum Beginn der Ge­schwindigkeitsabsenkung und zwei ganze Marken 4 und 5 bis zum Beginn der Spleiss-Periode. In Fig. 7 entspricht der Ab­stand DB beispielsweise zweieinhalb Markenabschnitten und die Geschwindigkeitsabsenkung beginnt, wenn die Marke 1 beim Punkt D vorbeigeht. Der Spleiss-Moment, an dem das Ende der vorbereiteten Folie 18 (Fig. 1) mit dem anlaufenden Ende der alten Folie 2 verbunden wird, entspricht dem Durchgang der Marke 1 beim Punkt B, an dem für einen Moment die Geschwin­digkeit der Folie null ist.The processor first determines the number of entire mark sections on the path x thus defined, which results in the current position of mark 1; it then calculates both the number of marks up to the beginning of the speed reduction and the corresponding phase shift of the motor 41, which is done with the aid of the signal va (FIG. 1), as well as the number of marks up to the splice torque and the corresponding phase shift of the motor 41. Im 7 there are two marks 6 and 7 until the start of the speed reduction and two whole marks 4 and 5 until the start of the splicing period. In Fig. 7, the distance DB corresponds to two and a half mark sections, for example, and the speed reduction begins when the mark 1 passes the point D. The splicing moment at which the end of the prepared film 18 (FIG. 1) is connected to the leading end of the old film 2 corresponds to the passage of the mark 1 at point B, at which the speed of the film is zero for a moment .

Ein Vorteil dieses Verfahrens besteht darin, dass für unter­schiedliche Formate nur eine Referenzstelle nötig ist. Zudem bewirkt dieses Verfahren eine definierte, kontrollierte Ab­senkbewegung, die ein genau zentriertes Spleissen, auch bei hoher Maschinenleistung ermöglicht.An advantage of this method is that only one reference point is required for different formats. In addition, this process results in a defined, controlled lowering movement that enables precisely centered splicing, even with high machine output.

Das Spleissen nach diesem Verfahren kann auch derart einge­stellt werden, dass die Abzugslänge durch Ermittlung des Ab­standes zwischen zwei Zentriermarken bestimmt wird, was bei­spielsweise durch ein Zusammenwirken eines optischen Tasters und eines Inkrementalgebers durchgeführt werden kann, wobei eine Abzugslänge dem Zentriermarkenabstand entspricht.The splicing according to this method can also be set in such a way that the trigger length is determined by determining the distance between two centering marks, which can be carried out, for example, by the interaction of an optical button and an incremental encoder, a trigger length corresponding to the centering mark distance.

Schliesslich sei noch bemerkt, dass der erste und/oder der zweite Motor Gleichstrom-Servomotoren mit Tachogenerator und Inkrementalgeber als auch Wechselstrom-Servomotoren beispiels­weise mit Resolver sein können, die sehr dynamisch sind und eine Aussage über den Absolutwinkel liefern. Auch andere An­triebe können sonst Verwendung finden. Zudem ist zu berück­sichtigen, dass die Integration, die durch den Integrator 49 des Ersatzschaltbildes nach Fig. 4 durchgeführt wird, bzw. die Subtraktion, die durch den Subtrahierer 48 ausgeführt wird, in Wirklichkeit physikalisch bei der Vorrichtung 22 stattfinden.Finally, it should also be noted that the first and / or the second motor can be DC servomotors with a tachometer generator and incremental encoder as well as AC servomotors with a resolver, for example, which are very dynamic and provide information about the absolute angle. Other drives can also be used otherwise. In addition, it must be taken into account that the integration, which is carried out by the integrator 49 of the equivalent circuit diagram according to FIG. 4, or the subtraction, which is carried out by the subtractor 48, actually takes place physically in the device 22.

Claims (9)

1. Vorrichtung zum Verbinden des Endes eines Bandes mit dem Anfang eines anderen Bandes, mit einem Antrieb für das ab Vorratsrolle ablaufende Band und mit einer weiteren Vorratsrolle für das zu verbindende Band, dadurch gekennzeich­net, dass ein zweiter Antrieb (41) zur Unterstützung der Bewe­gung des Bandes (2), eine erste Puffereinrichtung (22), um die Geschwindigkeitsunterschiede zu kompensieren, die das Band (2) vor und nach der Puffereinrichtung (22) aufweist oder aufweisen kann, und je eine weitere Puffereinrichtung (3,19) bei den Vorratsrollen (1;17) vorhanden sind, dass der erste Antrieb (31) in eine erste Servoeinrichtung (15) und der zweite Antrieb (41) in eine zweite Servoeinrichtung (16) integriert ist, wobei beide Servoeinrichtungen (15;16) an einen Rechner angeschlossen sind, und dass ein Mechanismus (4,20) zum Verbinden beider Bänderenden vorhanden ist.1. A device for connecting the end of a band with the beginning of another band, with a drive for the band running from the supply roll and with a further supply roll for the band to be connected, characterized in that a second drive (41) to support the movement of the belt (2), a first buffer device (22) to compensate for the speed differences which the belt (2) has or can have before and after the buffer device (22), and a further buffer device (3, 19) each Storage rolls (1; 17) are provided such that the first drive (31) is integrated in a first servo device (15) and the second drive (41) in a second servo device (16), both servo devices (15; 16) being connected to one Computers are connected, and that a mechanism (4, 20) for connecting both ends of the band is present. 2. Verfahren zum Betrieb der Vorrichtung nach An­spruch 1, dadurch gekennzeichnet, dass die zweite Servoein­richtung (16) ein Steuersignal Vas vom Rechner erhält, das in einem vorgegebenen Moment eine Verminderung der Bandgeschwin­digkeit v auf null bewirkt, um das Verbinden der zwei Bänder­enden zu erleichtern.2. The method for operating the device according to claim 1, characterized in that the second servo device (16) receives a control signal Vas from the computer, which in causes the tape speed v to decrease to zero at a predetermined moment to facilitate the joining of the two tape ends. 3. Verfahren nach Anspruch 2, dadurch gekennzeich­net, dass im Normalbetrieb, d.h. wenn die zwei Bänderenden bereits verbunden sind, für das Signal Vas die Beziehung
Vas = v + p.Whs - q .∫(va-v)dt
gilt, worin t eine Zeit und Whs die äquivalente Soll-Vergrös­serung der Bandschleife darstellt, die durch die erste Puffer­einrichtung (22) bewirkt wird, und worin va die durch den zweiten Antrieb (41) bewirkte Bandgeschwindigkeit darstellt und p und q Parameter sind.3. The method according to claim 2, characterized in that in normal operation, ie when the two band ends are already connected, the relationship for the signal Vas
Vas = v + p.Whs - q .∫ (va-v) dt
where t is a time and Whs is the equivalent target magnification of the belt loop, which is caused by the first buffer device (22), and va is the belt speed caused by the second drive (41) and p and q are parameters. 4. Verfahren nach Anspruch 2, dadurch gekennzeich­net, dass im Spezialbetrieb, das heisst während des Vorgangs zum Verbinden der zwei Bänderenden für das Signal Vas die Be­ziehung
Vas = f.∫v.dt - wa + g.v²
gilt, derart, dass im Moment der Verbindung der zwei Bänder­enden v = 0 ist, und worin wa ein Signal ist, das den momen­tanen Ist-Winkel des zweiten Antriebs (41) darstellt.4. The method according to claim 2, characterized in that in the special operation, that is, during the process of connecting the two band ends for the signal Vas, the relationship
Vas = f.∫v.dt - wa + g.v²
applies in such a way that at the moment of connection of the two band ends v = 0, and where wa is a signal which represents the current actual angle of the second drive (41). 5. Verfahren nach Anspruch 2 oder 3, dadurch gekenn­zeichnet, dass die erste Puffereinrichtung (22) nur während des Normalbetriebs geregelt wird.5. The method according to claim 2 or 3, characterized in that the first buffer device (22) is regulated only during normal operation. 6. Vorrichtung zur Ausführung des Verfahrens nach Anspruch 2, 3, 4 oder 5, dadurch gekennzeichnet, dass zwi­schen dem Mechanismus (4,20) zum Verbinden der zwei Bänder­enden und einer vom zweiten Antrieb (41) angetriebenen Rolle (6) ein Markentaster (27) angeordnet ist.6. The device for carrying out the method according to claim 2, 3, 4 or 5, characterized in that between the mechanism (4, 20) for connecting the two ends of the band and a roller (6) driven by the second drive (41), a brand button ( 27) is arranged. 7. Vorrichtung nach Anspruch 6, dadurch gekennzeich­net, dass pro Vorratsrolle (1;17) ein Taster (23;24) zur De­tektierung des Endes des jeweiligen Bandes angeordnet ist.7. The device according to claim 6, characterized in that for each supply roll (1; 17) a button (23; 24) for detecting the end of the respective band is arranged. 8. Vorrichtung nach Anspruch 6, dadurch gekennzeich­net, dass in Flussrichtung des Bandes gesehen der ersten Puffereinrichtung (22) nachgeordnet mindestens ein weiterer Taster (28,29) vorgesehen ist.8. The device according to claim 6, characterized in that, viewed in the direction of flow of the belt, at least one further button (28, 29) is provided downstream of the first buffer device (22). 9. Vorrichtung nach einem der Ansprüche 6 bis 8, da­durch gekennzeichnet, dass die Taster optische Sensoren sind.9. Device according to one of claims 6 to 8, characterized in that the buttons are optical sensors.
EP89810699A 1988-10-17 1989-09-18 Device for attaching the trailing end of a web to the leading end of another web Expired - Lifetime EP0365470B1 (en)

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CH3867/88 1988-10-17

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DE58909555D1 (en) 1996-02-15
JP2855142B2 (en) 1999-02-10
US5045134A (en) 1991-09-03
JPH02163253A (en) 1990-06-22
EP0365470A3 (en) 1991-02-27
EP0365470B1 (en) 1996-01-03

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