EP0009004A1 - Device for feeding wrapping material to a packing machine - Google Patents

Device for feeding wrapping material to a packing machine Download PDF

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Publication number
EP0009004A1
EP0009004A1 EP79810081A EP79810081A EP0009004A1 EP 0009004 A1 EP0009004 A1 EP 0009004A1 EP 79810081 A EP79810081 A EP 79810081A EP 79810081 A EP79810081 A EP 79810081A EP 0009004 A1 EP0009004 A1 EP 0009004A1
Authority
EP
European Patent Office
Prior art keywords
reel
packaging material
strip
service
coding
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
EP79810081A
Other languages
German (de)
French (fr)
Other versions
EP0009004B1 (en
Inventor
Endre Pongracz
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.)
Sapal SA
Original Assignee
Sapal SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sapal SA filed Critical Sapal SA
Publication of EP0009004A1 publication Critical patent/EP0009004A1/en
Application granted granted Critical
Publication of EP0009004B1 publication Critical patent/EP0009004B1/en
Expired legal-status Critical Current

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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
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/12—Feeding webs from rolls
    • 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
    • B65H19/1805—Flying splicing, i.e. the expiring web moving during splicing contact
    • B65H19/1826—Flying splicing, i.e. the expiring web moving during splicing contact taking place at a distance from the replacement roll
    • B65H19/1836—Flying splicing, i.e. the expiring web moving during splicing contact taking place at a distance from the replacement roll the replacement web being accelerated or running prior to splicing contact
    • 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
    • B65H2301/4631—Adhesive tape
    • B65H2301/46312—Adhesive tape double-sided
    • 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
    • B65H2301/464—Splicing effecting splice
    • B65H2301/4641—Splicing effecting splice by pivoting element
    • 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
    • B65H2301/464—Splicing effecting splice
    • B65H2301/46414—Splicing effecting splice by nipping rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/173—Metal

Definitions

  • the present invention relates to a device for supplying packaging material to a packaging machine, comprising two reels each carrying a reel of packaging material in the form of a strip, these reels being alternately put into service to ensure a continuous supply of the machine.
  • the present invention proposes to overcome this drawback in particular, by providing a device for supplying a packaging machine, with a packaging material in the form of very thin strips, this supply being made semi- automatic with maximum precision.
  • the device according to the invention is carcicterized in that it comprises two drive servomotors for independently driving the two reels, a device for driving the packaging material, two coding and detection devices. to supply a control signal regulating the drive speed of the reels, as a function of the drive speed of the packaging material and the instantaneous diameter of the reel in use, two end-of-strip detectors, and a device for assembling automatically the end of the strip of packaging material from the reel in service on the start of the strip from the next reel, this device comprising a press for applying the two ends of 3 strips one on the other and a control device for this press arranged to receive a signal for detecting the end of the strip by one of the two end of strip detectors and for controlling said press after a delay depending on the speed of entrainment of packaging material.
  • the device as shown in FIG. 1 comprises a reel 1, the spindle 2 of which supports a reel 3 of partially opened packaging material, for example aluminum film 9 to 10 ⁇ thick.
  • the spindle 2 of the reel is driven by a drive motor 4 having excellent acceleration and braking characteristics.
  • the packaging material 5 in strip form forms several loops, passing alternately over four rollers or rollers with fixed axes 6, 7, 8 and 9, and three rollers or rollers 10, 11 and 12, the axes of which are mounted on an arm 13 pivotable around a fixed axis 14.
  • the loops are more or less large depending on the position occupied by the arm 13, a position which depends on the tension exerted by the aluminum film and on the diameter of the mounted coil. on the reel.
  • a tension spring 15 At one end of the arm 14 is fixed the end of a tension spring 15, which tends to tilt the arm 14 in the direction of the arrow 1.6 around its pivot axis 14.
  • the packaging material passes over a roller 17 mounted on a support 18 pivotable about a fixed axis 19.
  • This support is solid with a rod 20 which can be translated between two extreme positions, under J action of an electromagnet 21.
  • the roller 17 In its position shown in solid lines, the roller 17 is set back, while in its position 17 'illustrated in broken lines, it is in front and rests on a roller 22 fixed axis. After the roller 17, the packaging material passes over a last roller 23 which causes it to change direction, before being finally pinched between two continuous or intermittent drive rollers 24 and 25 and passing in front of a cutting device 26 shown schematically. A non-return device 27 is mounted above the strip of packaging material, upstream of the roller 17.
  • the device of fig. 1 actually consists of a second set of elements similar to those which have just been described.
  • This assembly comprises, as previously, a reel 31, the spindle 32 of which supports a reel of unopened packaging material 33.
  • the spindle of the reel is driven by a drive motor 34 identical to the motor 4.
  • the packaging material in the form of a very thin aluminum film 35, unwinds by making a certain number of loops obtained by virtue of the fact that it passes alternately over the rollers of fixed axes 36, 37, 38 and 39 and over the rollers 40, 41 and 42, the axes of which are mounted on an arm 43 pivoting around a fixed axis 44 biased, on the one hand by a spring 45 in the direction of arrow 46, and on the other hand by traction exerted on the film 35 when it is engaged between the drive rollers 24 and 25.
  • a non-return device 47 is mounted above the film, located in this case upstream of the roller 22.
  • the two assemblies described above furthermore comprise a first incremental pulse generator 48, the reference disc 49 of which is driven in synchronism with the drive rollers 24 and 25, a second incremental pulse generator 50, the disc of which reference 51 is driven in synchronism with spindle 2 of the reel 1 by the drive motor 4 and a third incremental pulse generator 52, of which the reference disc 53 is. driven by motor 34, in sync nism with pin 32 of wire feeder 31.
  • the arm 13 carries an arcuate segment 54 comprising a succession of coding areas, intended to identify the position of said dough by means of a detector 55.
  • This arcuate segment carries for example three superimposed lines of black or white areas . Each line has, in the example shown, six ranges. A total of eighteen ranges are shown, which correspond to six three-bit codes. In fact, the part of the segment which does not have a range also corresponds to a three-bit code (three black areas) and the area fictitiously extending the segment beyond the coding ranges corresponds to an eighth three-bit code (three white beaches).
  • the distribution of the tracks and their number can be arbitrary depending on the information that one wishes to encode and decode.
  • the arm 43 carries an arcuate segment 56 identical to the segment 54 and intended to allow the location in position of said arm 43 by means of a detector 57.
  • Two switches 58 and 59 arranged so as to be engaged or triggered according to the position of the arms 13 and 43 respectively, control the starting or stopping of the drive motors 4 and 34.
  • the packaging material supply device is supplied by the reel 1 partially opened.
  • the spindle 2 is driven by the drive motor 4 by means, for example, of a toothed belt.
  • the packaging material is drawn towards the cutting device 26 by the two drive rollers 24 and 25.
  • the packaging material is drawn by the drive rollers, the reel unwinding only due to the pull on the strip of packaging material. This principle cannot be used with an aluminum film 9 to 10 ⁇ thick, the traction which it would be necessary to exert on said material to unwind the reel being greater than its mechanical strength.
  • the tensile force exerted by the drive rollers exerts a tension on the packaging material, which tends to pivot the arm 13 in the direction opposite to the arrow 16, an action which is counteracted by the traction of the spring 15.
  • the drive motor 102 of the spindle of the wire feeder 101 rotates at a speed which is controlled by a control signal called a setpoint proportional to the frequency of the pulses generated by the pulse generator 103.
  • the frequency of the speed setpoint is modified during operation of the device according to code 10 by the detector 104 on the arcuate segment carrying the coding ranges 105.
  • At a given diameter of the coil of packaging material currently in use corresponds to a position of the oscillating arm 106 on which is mounted the arcuate segment carrying the coding ranges 105. This position is generally not rigid, but oscillates between two coding ranges. As the coil diameter decreases from its maximum diameter to its minimum diameter, the swing arm moves clockwise.
  • the frequency of the speed setpoint F c determined by the pulse generator 103 is introduced into a multiplier 107 which multiplies this frequency by a coefficient K which is a digital factor depending on the code detected by the detector 104.
  • the output signal F cc known as the modified speed setpoint frequency of the multiplier 107, is transmitted to a frequency-voltage converter 108 which transmits a voltage U cc , called the modified speed setpoint voltage, to a comparator 109.
  • This comparator also receives a voltage U M said measured speed voltage, transmitted by a frequency-voltage converter 110, the input signal of which is a measured frequency signal F M supplied by a digital tachometer dynamo 111, rotating in synchronism with the drive motor 102.
  • the comparator provides an output signal to a four-dial regulator 112 which then regulates the speed of the drive motor 102 through a conventional circuit closed loop adjustment.
  • the end of the strip 35 of the reel 33 was brought manually to the roll 22 and provided, on its upper surface, with a double-sided adhesive strip, so that the support of the roll 17 on the roller 22 creates a bonding of the terminal end of the coil 3. on the beginning of the strip of the bobi ne 33.
  • the start of the signal actuating the electromagnet 21 also generates the switching cycle of the motor 4 on the motor 34 and of all the satellite elements of the reel 1 on the satellite elements of the reel 31.
  • the motor 34 is stopped.
  • the arm 43 moves counterclockwise and actuates the safety switch 59.
  • This switch starts the motor 34, the arm 43 adopting an equilibrium position as a function of the momentary diameter of the coil 33.
  • a detector 61 provides an end-of-band signal which acts in particular on the electromagnet 21, to bond the end of the strip 35 to a new strip 5, which has meanwhile been placed on the reel 1.
  • the present invention makes it possible to supply continuously, precisely and efficiently, a packaging machine with very thin packaging material. Thanks to the electronic end of strip detector and the electromechanical control of the gluing of one end of the strip at the beginning of the next strip, it is possible to obtain, at each change of reel, a section of packaging material in duplicate thickness, of constant length, this length being as small as possible.

Abstract

La présente invention concerne un dispositif d'approvisionnement en matériau d'emballage, d'une machine à emballer à deux dévidoirs. Ce dispositif comporte deux servomoteurs d'entraînement 4, 34, des dévidoirs 1, 31, un dispositif d'entraînement 24, 25 du matériau d'emballage en forme de bande, deux dispositifs de codage 54, 56 et de détection 55, 57, qui détectent un signal correspondant au diamètre instantané de la bobine de matériau d'emballage en service et fournissent un signal de commande de la vitesse d'entraînement des dévidoirs. Il comport également une presse 17, 21 pour assembler automatiquement la fin de la bande du matériau d'emballage de la bobine en service sur le début de la bande provenant de la bobine suivante.The present invention relates to a packaging material supply device, a packaging machine with two reels. This device comprises two drive servomotors 4, 34, reels 1, 31, a drive device 24, 25 of the packaging material in the form of a strip, two coding devices 54, 56 and detection 55, 57, which detect a signal corresponding to the instantaneous diameter of the reel of packaging material in service and provide a signal for controlling the drive speed of the reels. It also includes a press 17, 21 for automatically assembling the end of the strip of packaging material from the working reel to the start of the strip coming from the next reel.

Description

La présente invention concerne on dispositif d'approvisionnement en maté- riau d'emballage d'une machine à emballer, comprenant deux dévidoirs portant chacun une bobine de motériau d'emballage sous forme de bande, ces dévidoirs étant alternativement mis en service pour assurer un approvisionnement continu de la machine.The present invention relates to a device for supplying packaging material to a packaging machine, comprising two reels each carrying a reel of packaging material in the form of a strip, these reels being alternately put into service to ensure a continuous supply of the machine.

Pour augmenter le rendement des machines d'emballage à haute cadence, il est connu d'utiliser deux dévidoirs. Cette façon de procéder permet de recharger la machine sans la ralentir ou l' arrêter, c'est-à-dire remplacer une bobine vide par une bobine pleine pendant qu'une autre bobine se déroule, et de commuter automatiquent sur la nouvelle bobine lorsque la précédente est vide. Dans les dispositifs connus, l'entraînement des dévidoirs se fait exclusivement par simple traction du matériau d'emballage entraîné par deux rouleaux d'entraînement. Les bobines de matériau d'emballage étant relativement lourdes, le système dévidoir et bobine présente une inertie relativement grande au démarrage. La tension exercée sur le matériau d'emballage au moment du démarrage ou à chaque remise en route dans une machine fonctionnant de façon intermittente, est très grande, ce qui empêche l'utilisation d'un matériau d'emballage de faible épaisseur. En particulier, l'utilisation de film d'aluminium d'une épaisseur de 9 à 10 µ, dont la résistance à la traction est insuffisante pour être soumise à de telles tensions, est proscrite dans ces machines.To increase the efficiency of high-speed packaging machines, it is known to use two reels. This way of proceeding makes it possible to reload the machine without slowing it down or stopping it, that is to say replacing an empty reel with a full reel while another reel is taking place, and automatically switching to the new reel when the previous one is empty. In known devices, the reels are driven exclusively by simple pulling of the packaging material driven by two drive rollers. Since the reels of packaging material are relatively heavy, the reel and reel system has a relatively high inertia at start-up. The tension exerted on the packaging material at the time of startup or each time it is restarted in a machine operating intermittently, is very large, which prevents the use of packaging material of small thickness. In particular, the use of aluminum film with a thickness of 9 to 10 μm, the tensile strength of which is insufficient to be subjected to such tensions, is prohibited in these machines.

La présente invention se propose de remédier en particulier à cet inconvénient, en réalisant un dispositif d'approvisionnement d'une machine à emballer, en un matériau d'emballage sous forme de bandes de très faible épaisseur, cet approvisionnement se faisant de façon semi-automatique avec un maximum de précision.The present invention proposes to overcome this drawback in particular, by providing a device for supplying a packaging machine, with a packaging material in the form of very thin strips, this supply being made semi- automatic with maximum precision.

Dans ce but, le dispositif selon l'invention est carcictérisé on ce qu'il comporte deux servomoteurs d'entraînement pour entraîner de façon indépendante les deux dévidoirs, un dispositif d'entraînement du matériau d'emballage, deux dispositifs de codage et de détection pour fournir un signal de commande réglant la vitesse d'entraînement des dévidoirs, en fonction de la vitesse d'entraînement du matériau d'emballage et du diamètre instantané de la bobine en service, deux détecteurs de fin de bande, et un dispositif pour assembler automatiquement la fin de la bande du matériau d'emballage de la bobine en service sur le début de la bande provenant de la bobine suivante, ce dispositif comprenant une presse pour appliquer les deux extrémités d3 bandes l'une sur l'autre et un dispositif de commande de celte presse agencé pour recevoir un signal de détection de fin de bande par l'un des deux détecteurs de fin de bande et pour commander ladite presse après un retard dépendant de la vitesse d'entraînement du matériau d'emballage.For this purpose, the device according to the invention is carcicterized in that it comprises two drive servomotors for independently driving the two reels, a device for driving the packaging material, two coding and detection devices. to supply a control signal regulating the drive speed of the reels, as a function of the drive speed of the packaging material and the instantaneous diameter of the reel in use, two end-of-strip detectors, and a device for assembling automatically the end of the strip of packaging material from the reel in service on the start of the strip from the next reel, this device comprising a press for applying the two ends of 3 strips one on the other and a control device for this press arranged to receive a signal for detecting the end of the strip by one of the two end of strip detectors and for controlling said press after a delay depending on the speed of entrainment of packaging material.

La présente invention sera mieux comprise en référence à la description d'une forme de réalisation et du dessin annexé dans lequel :

  • La figure 1 représente une vue schématique du dispositif d'approvisionnement selon l'invention, et
  • La figure 2 illustre plus en détail le circuit de commande du dispositif de la figure 1.
The present invention will be better understood with reference to the description of an embodiment and the accompanying drawing in which:
  • FIG. 1 represents a schematic view of the supply device according to the invention, and
  • FIG. 2 illustrates in more detail the control circuit of the device of FIG. 1.

Le dispositif tel que représenté par la fig. 1 comporte un dévidoir 1 dont la broche 2 supporte une bobine 3 de matériau d'emballage partiellement entamée, par exemple du film d'aluminium de 9 à 10 µ d'épaisseur. La broche 2 du dévidoir est entraînée par un moteur d'entraînement 4 ayant d'excellentes caractéristiques d'accélération et de freinage. Le matériau d'emballage 5 en forn:e de bande forme plusieurs boucles, en passant alternativement sur quatre rouleaux ou galets d'axes fixes 6, 7, 8 et 9, et trois rouleaux ou galets 10, 11 et 12, dont les axes sont montés sur un bras 13 pivotable autour d'un axe fixe 14.The device as shown in FIG. 1 comprises a reel 1, the spindle 2 of which supports a reel 3 of partially opened packaging material, for example aluminum film 9 to 10 μ thick. The spindle 2 of the reel is driven by a drive motor 4 having excellent acceleration and braking characteristics. The packaging material 5 in strip form forms several loops, passing alternately over four rollers or rollers with fixed axes 6, 7, 8 and 9, and three rollers or rollers 10, 11 and 12, the axes of which are mounted on an arm 13 pivotable around a fixed axis 14.

Comme cela sera expliqué ci-dessous, les boucles sont plus ou moins grandes selon la position occupée par le bras 13, position qui dépend de la tension exercée par le film d'aluminium et du diamètre de la bobine montée sur le dévidoir. A l'une des extrémités du bras 14 est fixée l'extrémité d'un ressort de traction 15, qui a tendance à faire basculer le bras 14 dans le sens de la flèche 1.6 autour de son axe de pivotement 14. Après le rouleau d'axe fixe 9, le matériau d'emballage passe sur un rouleau 17 monté sur un support 18 pivotable autour d'un axe fixe 19. Ce support est soli- dairc d'une tige 20 pouvant être translatée entre deux positions extrémes, sous J'action d'un électro-aimant 21. Dans sa position représentée en traits pleins, le rouleau 17 se trouve en retrait, tandis que, dans sa position 17' illustrée en traits interrompus, il se trouve en avant et prend appui sur un rouleau 22 d'axe fixe. Après le rouleau 17, le matériau d'emballage passe sur un dernier rouleau 23 qui le fait changer de direction, avant d'être finalement pincé entre deux rouleaux d'entraînement continu ou intermittent 24 et 25 et de passer devant un dispositif de coupe 26 représenté schématiquement. Un dispositif anti-retour 27 est monté au-dessus de la bande de matériau d'emballage, en amont du rouleau 17.As will be explained below, the loops are more or less large depending on the position occupied by the arm 13, a position which depends on the tension exerted by the aluminum film and on the diameter of the mounted coil. on the reel. At one end of the arm 14 is fixed the end of a tension spring 15, which tends to tilt the arm 14 in the direction of the arrow 1.6 around its pivot axis 14. After the roller d fixed axis 9, the packaging material passes over a roller 17 mounted on a support 18 pivotable about a fixed axis 19. This support is solid with a rod 20 which can be translated between two extreme positions, under J action of an electromagnet 21. In its position shown in solid lines, the roller 17 is set back, while in its position 17 'illustrated in broken lines, it is in front and rests on a roller 22 fixed axis. After the roller 17, the packaging material passes over a last roller 23 which causes it to change direction, before being finally pinched between two continuous or intermittent drive rollers 24 and 25 and passing in front of a cutting device 26 shown schematically. A non-return device 27 is mounted above the strip of packaging material, upstream of the roller 17.

Le dispositif de la fig. 1 se compose en fait d'un second ensemble d'éléments similaires à ceux qui viennent d'être décrits. Cet ensemble comprend comme précédemment un dévidoir 31, dont la broche 32 supporte une bobine de matériau d'emballage 33 non entamée. La broche du dévidoir est entraînée par un moteur d'entraînement 34 identique au moteur 4. Comme précédemment, le matériau d'emballage; sous forme d'un film d'aluminium 35 de très faible épaisseur, se dévide en faisant un certain nombre de boucles obtenues grâce au fait qu'il passe alternativement sur les rouleaux d'axes fixes 36, 37, 38 et 39 et sur les rouleaux 40, 41 et 42, dont les axes sont montés sur un bras 43 pivotant autour d'un axe fixe 44 sollicité, d'une part par un ressort 45 dans le sens de la flèche 46, et d'autre part par la traction exercée sur le film 35 lorsqu'il est engagé entre les rouleaux d'entraînement 24 et 25. Comme précédemment, un dispositif anti-retour 47 se trouve monté au-dessus du film, localisé dans ce cas en amont du rouleau 22.The device of fig. 1 actually consists of a second set of elements similar to those which have just been described. This assembly comprises, as previously, a reel 31, the spindle 32 of which supports a reel of unopened packaging material 33. The spindle of the reel is driven by a drive motor 34 identical to the motor 4. As before, the packaging material; in the form of a very thin aluminum film 35, unwinds by making a certain number of loops obtained by virtue of the fact that it passes alternately over the rollers of fixed axes 36, 37, 38 and 39 and over the rollers 40, 41 and 42, the axes of which are mounted on an arm 43 pivoting around a fixed axis 44 biased, on the one hand by a spring 45 in the direction of arrow 46, and on the other hand by traction exerted on the film 35 when it is engaged between the drive rollers 24 and 25. As previously, a non-return device 47 is mounted above the film, located in this case upstream of the roller 22.

Les deux ensembles décrits précédemment comportent par ailleurs un premier générateur d'impulsions incrémental 48, dont le disque de référence 49 est entraîné en synchronisme avec les rouleaux d'entraînement 24 et 25, un second générateur d'impulsions incrémental 50, dont le disque de référence 51 est entraîné en synchronisme avec la broche 2 du dévidoir 1 par le moteur d'entraînement 4 et un troisième générateur d'impulsions incrémental 52, dont le disque de référence 53 est. entraîné par le moteur 34, en synchronisme avec la broche 32 du dévidoir 31.The two assemblies described above furthermore comprise a first incremental pulse generator 48, the reference disc 49 of which is driven in synchronism with the drive rollers 24 and 25, a second incremental pulse generator 50, the disc of which reference 51 is driven in synchronism with spindle 2 of the reel 1 by the drive motor 4 and a third incremental pulse generator 52, of which the reference disc 53 is. driven by motor 34, in sync nism with pin 32 of wire feeder 31.

D'autre part, le bras 13 porte un segment arqué 54 comportant une succession de plages de codage, destinées à repérer la position dudit brus au moyen d'un détecteur 55. Ce segment arqué porte par exemple trois lignes superposées de plages noires ou blanches. Chaque ligne comporte, dans l'exemple représenté, six plages. Au total dix-huit plages sont représentées, qui correspondent à six codes à trois bits. En fait, la partie du segment qui ne porte pas de plage correspond également à un code à trois bits (trois plages noires) et la zone prolongeant fictivement le segment au-delà des plages de codage correspond à un huitième code à trois bits (trois plages blanches). Bien entendu, la répartition des plages et leur nombre peut être quelconque selon les informations que l'on souhaite coder et décoder. De façon analogue, le bras 43 porte un segment arqué 56 identique au segment 54 et destiné à permettre le repérage en position dudit bras 43 au moyen d'un détecteur 57. Deux interrupteurs 58 et 59, agencés de façon à être enclenchés ou déclenchés selon la position des bras 13 et 43 respectivement, commandent la marche ou l'arrêt des moteurs d'entraînement 4 et 34.On the other hand, the arm 13 carries an arcuate segment 54 comprising a succession of coding areas, intended to identify the position of said dough by means of a detector 55. This arcuate segment carries for example three superimposed lines of black or white areas . Each line has, in the example shown, six ranges. A total of eighteen ranges are shown, which correspond to six three-bit codes. In fact, the part of the segment which does not have a range also corresponds to a three-bit code (three black areas) and the area fictitiously extending the segment beyond the coding ranges corresponds to an eighth three-bit code (three white beaches). Of course, the distribution of the tracks and their number can be arbitrary depending on the information that one wishes to encode and decode. Similarly, the arm 43 carries an arcuate segment 56 identical to the segment 54 and intended to allow the location in position of said arm 43 by means of a detector 57. Two switches 58 and 59, arranged so as to be engaged or triggered according to the position of the arms 13 and 43 respectively, control the starting or stopping of the drive motors 4 and 34.

Supposons d'abord, comme le représente la fig. 1, que le dispositif d'approvisionnement en matériau d'emballage est alimenté par le dévidoir 1 partiellement entamé. La broche 2 est mue par le moteur d'entraînement 4 au moyen, par exemple, d'une courroie crantée. Par ailleurs, le matériau d'emballage est entraîné vers le dispositif de coupe 26 par les deux rouleaux d'entraînement 24 et 25. Dans les systèmes connus, le matériau d'emballage est tiré par les rouleaux d'entraînement, la bobine se dévidant uniquement en raison de la traction exercée sur la bande du matériau d'emballage. Ce principe n'est pas utilisable avec un film d'aluminium de 9 à 10 µ d'épaisseur, la traction qu'il faudrait exercer sur ledit matériau pour dérouler le dévidoir étant supérieure à sa résistance mécanique. La force de traction exercée par les rouleaux d'entraînement exerce une tension sur le matériau d'amballage, qui tend à faire pivoter le bras 13 dans le sens opposé à lu flèche 16, action qui est contrecarrée par la traction du ressort 15.Suppose first, as shown in fig. 1, that the packaging material supply device is supplied by the reel 1 partially opened. The spindle 2 is driven by the drive motor 4 by means, for example, of a toothed belt. Furthermore, the packaging material is drawn towards the cutting device 26 by the two drive rollers 24 and 25. In known systems, the packaging material is drawn by the drive rollers, the reel unwinding only due to the pull on the strip of packaging material. This principle cannot be used with an aluminum film 9 to 10 μ thick, the traction which it would be necessary to exert on said material to unwind the reel being greater than its mechanical strength. The tensile force exerted by the drive rollers exerts a tension on the packaging material, which tends to pivot the arm 13 in the direction opposite to the arrow 16, an action which is counteracted by the traction of the spring 15.

En référence à la fig. 2, le moteur d'entraînement 102 de la broche du dévidoir 101 tourne à une vitesse qui est commandée par un signal de commande dit consigne proportionnelle à la fréquence des impulsions engendrées par le générateur d'impulsions 103. La fréquence de la consigne de vitesse est modifiée en cours de fonctionnenent du dispositif selon le code 10 par le détecteur 104 sur le segment arqué portant les plages de codage 105. A un diamètre donné de la bobine de matériau d'emballage présentement en service, correspond une position du hras oscillant 106 sur lequel se trouve monté le segment arqué portant les plages de codage 105. Cette position n'est en général pas rigide, mais oscille entre deux plages de codage. Pen- dont que le diamètre de la bobine diminue en passant de son diamètre maximal à son diamètre minimal, le bras oscillant se déplace dans le sens des aiguilles d'une montre.With reference to fig. 2, the drive motor 102 of the spindle of the wire feeder 101 rotates at a speed which is controlled by a control signal called a setpoint proportional to the frequency of the pulses generated by the pulse generator 103. The frequency of the speed setpoint is modified during operation of the device according to code 10 by the detector 104 on the arcuate segment carrying the coding ranges 105. At a given diameter of the coil of packaging material currently in use, corresponds to a position of the oscillating arm 106 on which is mounted the arcuate segment carrying the coding ranges 105. This position is generally not rigid, but oscillates between two coding ranges. As the coil diameter decreases from its maximum diameter to its minimum diameter, the swing arm moves clockwise.

La fréquence de la consigne de vitesse Fc déterminée par le générateur d'impulsions 103, est introduite dans un multiplicateur 107 qui multiplie cette fréquence par un coefficient K qui est un facteur digital dépendant du code détecté par le détecteur 104. Le signal de sortie Fcc, dit fréquence consigne de vitesse modifiée du multiplicateur 107, est transmis à un convertisseur fréquence-tension 108 qui transmet une tension Ucc, dite tension consigne de vitesse modifiée, à un comparateur 109. Ce comparateur reçoit par ailleurs une tension UM dite tension de vitesse mesurée, transmise par un convertisseur fréquence-tension 110, dont le signal d'entrée est un signal de fréquence mesurée FM fourni ppr une dynamo tachymétrique digitale 111, tournant en synchronisme avec le moteur d'entraînement 102. Le comparateur fournit un signal de sortie à un régulateur à quatre cadrans 112 qui règle ensuite la vitesse du moteur d'entraînement 102 par l'intermédiaire d'un circuit conventionnel de réglage à boucle fermée.The frequency of the speed setpoint F c determined by the pulse generator 103, is introduced into a multiplier 107 which multiplies this frequency by a coefficient K which is a digital factor depending on the code detected by the detector 104. The output signal F cc , known as the modified speed setpoint frequency of the multiplier 107, is transmitted to a frequency-voltage converter 108 which transmits a voltage U cc , called the modified speed setpoint voltage, to a comparator 109. This comparator also receives a voltage U M said measured speed voltage, transmitted by a frequency-voltage converter 110, the input signal of which is a measured frequency signal F M supplied by a digital tachometer dynamo 111, rotating in synchronism with the drive motor 102. The comparator provides an output signal to a four-dial regulator 112 which then regulates the speed of the drive motor 102 through a conventional circuit closed loop adjustment.

Comme cela a été mentionné précédemment en référence à la fig. 1, lorsque la bobine 3, portée par la broche 2, arrive à sa fin, l'extrémité du matériau d'emballage est arrachée et sera détectée par un détecteur de fin de bande qui transmet, après un retard programmé qui est lui-même une fonction de la vitesse de la machine, un signal de fin de bande à l'électro-aimant 21. Cette impulsion d'excitation provoque le déplacement de la tige 20 portant, à son extrémité, le rouleau 17 qui est ainsi amené dans sa position 17', en appui sur le rouleau 22, pour retourner dans sa position initiale à la fin de l'impulsion d'excitation. Au préalable, l'extrémité de la bande 35 de la bobine 33 a été amenée manuellement sur le rouleau 22 et munie, à sa surface supérieure, d'une bande adhésive à double face, de sorte que l'appui du rouleau 17 sur le rouleau 22 engendre un collage de l'extrémité terminale de la bobine 3. sur le début de la bande de la bobine 33.As mentioned previously with reference to FIG. 1, when the reel 3, carried by the spindle 2, comes to an end, the end of the packaging material is torn off and will be detected by an end of tape detector which transmits, after a programmed delay which is itself a function of the speed of the machine, a band end signal to the electromagnet 21. This excitation pulse causes the displacement of the rod 20 carrying, at its end, the roller 17 which is thus brought into its position 17 ', pressing on the roller 22, to return to its initial position at the end of the excitation pulse. Beforehand, the end of the strip 35 of the reel 33 was brought manually to the roll 22 and provided, on its upper surface, with a double-sided adhesive strip, so that the support of the roll 17 on the roller 22 creates a bonding of the terminal end of the coil 3. on the beginning of the strip of the bobi ne 33.

Simultanément, le début du signal actionnant l'électro-aimant 21 engendre également le cycle de commutation du moteur 4 sur le moteur 34 et de l'ensemble des éléments satellites du dévidoir 1 sur les éléments satellites du dévidoir 31. Au moment de cette commutation, le moteur 34 est arrêté. Sous l'action de la tension exercée sur le matériau d'emballage entraîné par les rouleaux 24 et 25, le bras 43 se déplace dans le sens contraire à celui des aiguilles d'une montre et actionne l'interrupteur de sécurité 59. Cet interrupteur enclenche le moteur 34, le bras 43 adoptant une position d'équilibre fonction du diamètre momentané de la bobine 33. Comme précédemment, en fin de course un détecteur 61 fournit un signal de fin de bande qui agit en particulier sur l'électro-aimant 21, pour coller l'extrémité de la bande 35 sur une nouvelle bande 5, qui aura entre-temps été mise en place sur le dévidoir 1.Simultaneously, the start of the signal actuating the electromagnet 21 also generates the switching cycle of the motor 4 on the motor 34 and of all the satellite elements of the reel 1 on the satellite elements of the reel 31. At the time of this switching , the motor 34 is stopped. Under the action of the tension exerted on the packaging material driven by the rollers 24 and 25, the arm 43 moves counterclockwise and actuates the safety switch 59. This switch starts the motor 34, the arm 43 adopting an equilibrium position as a function of the momentary diameter of the coil 33. As before, at the end of the race a detector 61 provides an end-of-band signal which acts in particular on the electromagnet 21, to bond the end of the strip 35 to a new strip 5, which has meanwhile been placed on the reel 1.

La présente invention permet d'approvisionner en continu, de façon précise et efficace, une machine à emballer en un matériau d'emballage de très faible épaisseur. Grâce au détecteur électronique de fin de bande et à la commande électromécanique du collage d'une fin de bande au début de la bande suivante, il est possible d'obtenir, à chaque changement de bobine, un tronçon de matériau d'emballage en double épaisseur, de Jongueur constante, cette longueur étant aussi réduite que possible.The present invention makes it possible to supply continuously, precisely and efficiently, a packaging machine with very thin packaging material. Thanks to the electronic end of strip detector and the electromechanical control of the gluing of one end of the strip at the beginning of the next strip, it is possible to obtain, at each change of reel, a section of packaging material in duplicate thickness, of constant length, this length being as small as possible.

Claims (5)

1. Dispostif d'approvisionnement en matériau d'emballage, d'une machine à emballer, comprenant deux dévidoirs portant chacun une bobine de matériau d'emballage sous forme de bande, ces dévidoirs étant alternativement mis en service pour assurer un approvisionnemnt continu de la machine, caractérisé en ce qu'il comporte deux servomoteurs d'entraînement, pour entraîner de façon indépendante les deux dévidoirs, un dispositif d'entraînement du matériau d'emballage, deux dispositifs de codage et de détection, pour fournir un signal de commande réglant la vitesse d'entrainement dévidoirs, en fonction de la vitesse d'entraînement du matériau d'emballage et du diamètre instantané de la bobine en service, deux détecteurs de fin de bande et un dispositif pour assembler automatiquement la fin de la bande du matériau d'amballage de la bobine en service sur le début de la bande provenant de la bobine suivante, ce dispositif comprenant une presse pour appliquer les deux extrémités de bandes l'une sur l'autre et un dispositif de commande de cette presse, agencé pour recevoir un signal de détection de fin de bande par l'un des deux détecteurs de fin de bande et pour commander ladite presse, après un retard dépendant de la vitesse d'entraînement du matériau d'emballage.1. Dispensing device for packaging material, of a packaging machine, comprising two reels each carrying a reel of packaging material in the form of a strip, these reels being alternately put into service to ensure a continuous supply of the machine, characterized in that it comprises two drive servomotors, for independently driving the two reels, a device for driving the packaging material, two coding and detection devices, for providing a regulating control signal the reel drive speed, depending on the drive speed of the packaging material and the instantaneous diameter of the reel in service, two end of strip detectors and a device for automatically assembling the end of the strip of material d wrapping the reel in service on the start of the strip from the next reel, this device comprising a press for applying the two ends of the strips to one r the other and a control device for this press, arranged to receive an end of band detection signal by one of the two end of band detectors and to control said press, after a delay depending on the speed of entrainment of packaging material. 2. Dispositif selon la revendication 1, caractérisé en ce que les deux dispositifs de codage et de détection comportent chacun un bras pivotant autour d'un axe fixe, dont la position d'équilibre à chaque instunt est déterminée par la tension exercée par le matériau d'emballage et la force de rappel exercée par un ressort, ladite position d'équilibre étant une fonction du diamètre instantané de la bobine de matériau d'emballage en service, un segment arqué portant un codage, solidaire d'une des extrémités de chacun de ces bras et un détecteur agencé pour détecter ledit codage et transmettre un signal de correction de la vitesse d'entraînement du dévidoir correspondant, en fonction du diamètre de la bobine portée par ce dévidoir.2. Device according to claim 1, characterized in that the two coding and detection devices each comprise an arm pivoting about a fixed axis, whose equilibrium position at each instunt is determined by the tension exerted by the material and the restoring force exerted by a spring, said equilibrium position being a function of the instantaneous diameter of the reel of packaging material in service, an arcuate segment carrying a coding, integral with one of the ends of each of these arms and a detector arranged to detect said coding and transmit a signal for correcting the drive speed of the corresponding reel, as a function of the diameter of the coil carried by this reel. 3. Dispositif selon la revendication 1, caractérisé en ce que le dispositif pour assembler automatiquement deux bandes de matériau d'emballage provenant de deux bobines entrant en service successivement, comporte un électro-aimant, agencé pour agir sur une presse, ladite presse comportant un rouleau mobile monté sur un support pivotant et un rouleau fixe, les extrémités des bandes à assembler étant momentanément pressées entre les deux rouleaux.3. Device according to claim 1, characterized in that the device for automatically assembling two strips of packaging material from two coils entering service successively, comprises an electromagnet, arranged to act on a press, said press comprising a movable roller mounted on a pivoting support and a fixed roller, the ends of the strips to be assembled being momentarily pressed between the two rollers. 4. Dispositif selon la revendication 1, caractérisé en ce qu'il comporte deux rouleaux d'entraînement du matériau d'emballage et un générateur d'impulsions tournant en synchronisme avec les rouleaux, ledit générateur d'impulsions étant agencé pour fournir un signal dit consigne de vitesse au servomoteur d'entraînement du dévidoir momentanément en service.4. Device according to claim 1, characterized in that it comprises two rollers for driving the packaging material and a pulse generator rotating in synchronism with the rollers, said pulse generator being arranged to supply a so-called signal speed setpoint on the reel drive servomotor momentarily in service. 5. Dispositif selon les revendications 2 et 4, caractérisé en ce qu'il comporte un multiplicateur digital pour corriger la consigne de vitesse, en fonction du signal de correction transmis par le détecteur de codage.5. Device according to claims 2 and 4, characterized in that it comprises a digital multiplier for correcting the speed setpoint, according to the correction signal transmitted by the coding detector.
EP79810081A 1978-09-05 1979-08-30 Device for feeding wrapping material to a packing machine Expired EP0009004B1 (en)

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CH929878A CH623792A5 (en) 1978-09-05 1978-09-05
CH9298/78 1978-09-05

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GB759503A (en) * 1953-09-09 1956-10-17 Eldorado Ice Cream Company Ltd Improvements in or relating to means for continuously feeding webs of material
US3382488A (en) * 1965-01-29 1968-05-07 Sig Schweiz Industrieges Processing machine, particularly a packing machine
US3580757A (en) * 1967-07-18 1971-05-25 Niepmann & Co Maschf Fr Web winding machines
GB1474578A (en) * 1973-07-24 1977-05-25 Skoda Np Device for continuous feeding of wrapping material into a packing machine
FR2293386A1 (en) * 1974-12-06 1976-07-02 Hauni Werke Koerber & Co Kg DEVICE FOR ATTACHING THE FRONT END OF A BAND OF RESERVE COIL TO THE BAND OF A COIL ARRIVING AT DEPLETION
DE2749935A1 (en) * 1976-11-08 1978-05-11 Butler Automatic Inc DEVICE FOR JOINING THE BEGINNING OF A TAPE-SHAPED MATERIAL wound on a reel
GB2003119A (en) * 1977-08-25 1979-03-07 Ima Spa Apparatus for joining without stop the tail end of a web from a coil being exhausted to the leading end of a fresh coil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5699978A (en) * 1995-02-14 1997-12-23 Tokyo Automatic Machinery Works, Ltd. Tear tape changer
EP0819610A1 (en) * 1995-02-14 1998-01-21 Tokyo Automatic Machinery Works Limited Tear tape changer
EP0849179A1 (en) * 1996-12-17 1998-06-24 Voith Sulzer Finishing GmbH Device for packaging a roll of web material by means of packaging web
US5983606A (en) * 1996-12-17 1999-11-16 Voith Sulzer Finishing Gmbh Device and method for packaging a web roll with a packaging sheet

Also Published As

Publication number Publication date
US4222533A (en) 1980-09-16
CH623792A5 (en) 1981-06-30
DE2961071D1 (en) 1981-12-24
EP0009004B1 (en) 1981-10-21

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