EP0365470B1 - Dispositif de raccordement de l'extrémité terminale d'une bande avec le début d'une autre bande - Google Patents

Dispositif de raccordement de l'extrémité terminale d'une bande avec le début d'une autre bande Download PDF

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Publication number
EP0365470B1
EP0365470B1 EP89810699A EP89810699A EP0365470B1 EP 0365470 B1 EP0365470 B1 EP 0365470B1 EP 89810699 A EP89810699 A EP 89810699A EP 89810699 A EP89810699 A EP 89810699A EP 0365470 B1 EP0365470 B1 EP 0365470B1
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EP
European Patent Office
Prior art keywords
web
servomechanism
signal
drive
output signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89810699A
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German (de)
English (en)
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EP0365470A2 (fr
EP0365470A3 (fr
Inventor
Thomas Schenker
Horst Loewenthal
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.)
Schweizerische Industrie Gesellschaft
Original Assignee
Schweizerische Industrie Gesellschaft
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Publication date
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Publication of EP0365470A2 publication Critical patent/EP0365470A2/fr
Publication of EP0365470A3 publication Critical patent/EP0365470A3/fr
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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 method for connecting the end of a band to the beginning of another band according to the preamble of claim 1.
  • Such a method is known from FR-A-2 078 354.
  • This method works with a device which comprises an integrator consisting of an operational amplifier and a capacitor.
  • the output of the operational amplifier is connected to the input of a threshold switch which supplies current for a relay which is provided in order to switch off the first drive motor.
  • This device can use a buffer device to compensate for the speed differences that the belt has or can have before and after the buffer device.
  • a device for feeding a tape which has two buffer devices for the supply rolls. These buffer devices are located in front of the mechanism for connecting both ends of the tape.
  • the invention is based on the object of improving a method of the type mentioned at the outset in such a way that a precisely centered splicing is possible, even with high machine output.
  • 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 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.
  • the packaging machine according to FIG. 1 is also provided with a second supply roll 17, from which a band or a film 18 can be unwound as soon as the supply roll 1 is empty.
  • 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.
  • 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 specific point on 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 change function v (t) shown.
  • 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 2 ⁇ (FIG. 2) due to the movement of the rocker arm 71.
  • the speeds are the two Parts of the film the same.
  • the processor performs the following operations:
  • p and q are parameters with the dimension s ⁇ 1.
  • 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 the output signals z and v of the circuit 51 and the device 15 are multiplied.
  • the output signal Vas of the circuit 55 is fed to the device 16, which also supplies the signal va.
  • FIG. 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.
  • 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 each time 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 defined in this way, which gives the current position of mark 1; it then calculates both the number of marks up to the start 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 such 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. It should also 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.

Landscapes

  • Replacement Of Web Rolls (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Claims (9)

  1. Dispositif pour raccorder l'extrémité d'une bande au début d'une autre bande, comportant un premier dispositif d'entraînement (31) pour la bande (2) déroulée d'un rouleau débiteur (1), un second dispositif d'entraînement (41) pour assister le déplacement de la bande (2), un autre rouleau débiteur (17) pour la bande devant être raccordée, un premier dispositif tampon (22) pour compenser les différences de vitesse, que la bande (2) présente ou peut présenter en amont et en aval du dispositif tampon (22), un intégrateur (49), respectivement un autre dispositif tampon (3,19) pour les rouleaux débiteurs (1;17), et un mécanisme (4,20) pour raccorder les deux extrémités des bandes, ce dispositif étant agencé pour réduire à zéro la vitesse entre les bandes lorsque deux extrémités de bandes doivent être raccordées, caractérisé en ce que le premier dispositif d'entraînement (31) est intégré dans un premier dispositif d'asservissement (15) et le second dispositif d'entraînement (41) est intégré dans un second dispositif d'asservissement (16), par le fait que les deux dispositifs d'asservissement (15;16) sont raccordés à un calculateur, et que le second dispositif d'asservissement (16) reçoit du calculateur un signal de commande Vas, pour lequel dans le fonctionnement normal, c'est-à-dire lorsque les deux extrémités des bandes sont déjà reliées, on a la relation Vas = v + p.Whs - q . ∫ (va-v)dt
    Figure imgb0042
     t désignant un temps, Whs un allongement de consigne équivalent de la boucle de bande du premier dispositif tampon (22), va la vitesse de la bande produite par le second dispositif d'entraînement (41) et v la vitesse réelle de la bande dans le premier dispositif d'entraînement (31), p et q étant des paramètres.
  2. Dispositif selon la revendication 1, caractérisé en ce que pour la commande du second dispositif d'asservissement (16) pendant le fonctionnement particulier, c'est-à-dire pendant l'opération de raccordement des deux extrémités des bandes, le calculateur délivre un signal pour lequel la relation Vas = f.∫v.dt - wa + g.v 2
    Figure imgb0043
     est valable de sorte qu'au moment du raccordement des deux extrémités des bandes, on a v = 0, wa étant un signal qui représente l'angle réel instantané du second dispositif d'entraînement (41), tandis que f et g sont des paramètres.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le calculateur travaille, dans le fonctionnement normal, conformément à un circuit équivalent, qui possède un circuit de correction de vitesse (51), un circuit de correction de phase (53), un multiplicateur (52), un circuit additionneur (55) et un soustracteur (54), pour exécuter les opérations suivantes :
    a) un signal d'angle réel wr du premier dispositif d'asservissement (15) est envoyé au circuit de correction de phase (53), dont le signal de sortie Was charge le soustracteur (54) pour former la différence da = Was - wa
    Figure imgb0044
    ,
    b) le signal d'angle réel wr du premier dispositif d'asservissement (15) est également envoyé au circuit de correction de vitesse (51), dont le signal de sortie z est multiplié, dans le multiplicateur (52), par le premier signal de sortie v du premier dispositif d'asservissement (15), pour former un signal de sortie V'as, qui est ajouté au signal da dans le circuit additionneur (55), et
    c) le signal de sortie Vas du circuit additionneur (55) est envoyé au second dispositif d'asservissement (16) de manière à réduire la vitesse entre les bandes à zéro.
  4. Dispositif selon l'une des revendications 1 à 3, caractérisé par le fait que dans le fonctionnement normal, le processeur travaille conformément à un second circuit équivalent pour effectuer les opérations suivantes :
    a) le signal de sortie v du premier dispositif d'asservissement (15) est envoyé à un premier soustracteur (47), qui forme la différence Vas = v - p.dh
    Figure imgb0045
    , p étant un paramètre et dh le signal de sortie d'un second soustracteur (46), avec formation de la différence dh = wh - Whs
    Figure imgb0046
    , le signal wh étant délivré par un intégrateur (49),
    b) l'intégrateur (49) reçoit, à son entrée, le signal de sortie vh d'un troisième soustracteur (48), qui forme le signal de différence vh = va - v
    Figure imgb0047
    , et
    c) le signal de sortie Vas est utilisé en tant que signal de commande pour le second dispositif d'asservissement (16), pendant le fonctionnement normal.
  5. Dispositif selon l'une des revendications 2 à 4, caractérisé par le fait que le premier dispositif tampon (22) est réglé uniquement pendant le fonctionnement normal.
  6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce qu'un détecteur de marques (27) est disposé entre le mécanisme (4,20) servant à raccorder les deux extrémités des bandes et un rouleau (6) entraîné par le second dispositif d'entraînement (41).
  7. Dispositif selon la revendication 6, caractérisé en ce que pour chaque rouleau débiteur (1;17) il est prévu un palpeur (23;24) servant à détecter l'extrémité de la bande respective.
  8. Dispositif selon la revendication 6, caractérisé en ce qu'au moins un autre palpeur (28,29) est prévu en aval du premier dispositif tampon (22), dans la direction de déplacement de la bande.
  9. Dispositif selon l'une des revendications 6 à 8, caractérisé en ce que les palpeurs sont des capteurs optiques.
EP89810699A 1988-10-17 1989-09-18 Dispositif de raccordement de l'extrémité terminale d'une bande avec le début d'une autre bande Expired - Lifetime EP0365470B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH386788 1988-10-17
CH3867/88 1988-10-17

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EP0365470A2 EP0365470A2 (fr) 1990-04-25
EP0365470A3 EP0365470A3 (fr) 1991-02-27
EP0365470B1 true EP0365470B1 (fr) 1996-01-03

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US (1) US5045134A (fr)
EP (1) EP0365470B1 (fr)
JP (1) JP2855142B2 (fr)
DE (1) DE58909555D1 (fr)

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Publication number Publication date
US5045134A (en) 1991-09-03
JP2855142B2 (ja) 1999-02-10
EP0365470A2 (fr) 1990-04-25
JPH02163253A (ja) 1990-06-22
DE58909555D1 (de) 1996-02-15
EP0365470A3 (fr) 1991-02-27

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