EP0102301B1 - Machine and working cycle for making plastic bags with a zip fastener and device for positioning them - Google Patents

Machine and working cycle for making plastic bags with a zip fastener and device for positioning them Download PDF

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Publication number
EP0102301B1
EP0102301B1 EP83401730A EP83401730A EP0102301B1 EP 0102301 B1 EP0102301 B1 EP 0102301B1 EP 83401730 A EP83401730 A EP 83401730A EP 83401730 A EP83401730 A EP 83401730A EP 0102301 B1 EP0102301 B1 EP 0102301B1
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EP
European Patent Office
Prior art keywords
slider
sheets
rollers
frame
movement
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
Application number
EP83401730A
Other languages
German (de)
French (fr)
Other versions
EP0102301A2 (en
EP0102301A3 (en
Inventor
Gilbert Paul Jean-Marie Hugues
Norbert Albert Heyka
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.)
Flexico France SARL
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Flexico France SARL
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Filing date
Publication date
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Publication of EP0102301A2 publication Critical patent/EP0102301A2/en
Publication of EP0102301A3 publication Critical patent/EP0102301A3/en
Application granted granted Critical
Publication of EP0102301B1 publication Critical patent/EP0102301B1/en
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B19/00—Slide fasteners
    • A44B19/42—Making by processes not fully provided for in one other class, e.g. B21D53/50, B21F45/18, B22D17/16, B29D5/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/813—Applying closures
    • B31B70/8131—Making bags having interengaging closure elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S493/00—Manufacturing container or tube from paper; or other manufacturing from a sheet or web
    • Y10S493/916—Pliable container
    • Y10S493/927—Reclosable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53291—Slide fastener
    • Y10T29/533—Means to assemble slider onto stringer

Definitions

  • the present invention relates generally to a machine for the manufacture of plastic bags consisting of two superimposed sheets welded along their lateral edges, the bottom remaining open or being closed by a welding or folding line, these bags being equipped with profiled coupling elements extending along the edges of their opening and capable of being coupled by elastic deformation by pressure under the effect of the sliding of a slider, this machine comprising, inter alia, in known manner , downstream of an extruder producing the sheets, on the one hand an apparatus for automatically placing sliders, in operational position, on profiled coupling elements which extend along the longitudinal edges of two sheets superimposed in movement, and on the other hand, a welding and cutting blade suitable for carrying out at the desired rate, and this during periodic stops in the running of the sheets, transverse welding lines constituting the side edges of the bags.
  • Said profiled coupling elements can be extruded at the same time as the sheet and constitute an integral part thereof, or be produced separately and be attached continuously to the respective longitudinal edges of the sheets, by welding or by bonding.
  • a suitable device such as that which is the subject of the French invention patent FR-A-2 491 742 automatically installs the said sliders, which come, in the operational position, to cover the said profiled coupling elements over each width of bag.
  • This automatic positioning of the sliders is carried out - of course also at the desired rate - upstream of the welding station and cross section of the sheets.
  • One of the aims of the present invention is to avoid the disadvantage of having to move the slider installation device, which is relatively heavy and bulky, more or less frequently, and to ensure that '' it can be fixed, while also automatically and safely avoiding the risk of any operational incident.
  • a machine of the general type indicated at the beginning is, in accordance with the present invention, characterized in that it further comprises, between said apparatus for placing cursors and said welding and cutting blade, a positioning apparatus automatic said sliders on said coupling coupling elements, adapted to bring them at a determined distance from the location provided for said transverse welding lines, regardless of the width provided for said bags.
  • the cursor fitting device can be fixed, which can be more particularly advantageous when it is planned that this device works on sheets in movement, at least part of the course of which is vertical, an arrangement which makes it more simple and more reliable the means of supplying the device with sliders, since these then move by simple gravity in a vertical chute.
  • an additional characteristic of a machine according to the invention may consist in that said slider fitting device is fixed and operates on a vertical part of the path of the sheets in movement.
  • the present invention also relates, and more particularly, to the structure and the operating mode of said automatic cursor positioning device.
  • said device will be characterized in that it essentially comprises a chassis, a passage provided for allowing the scrolling of said profiled coupling elements which extend along the edges longitudinal of two superimposed sheets, and, on either side of this passage, two facing rollers, mounted at the free ends of two pivoting arms and capable, among other movements, of moving away from one of the other, to allow free passage to a slider mounted on said profiled elements, or to approach one another, and momentarily prevent this passage, which, the scrolling of the sheets continuing, causes a longitudinal displacement, d 'determined amplitude, of said cursor on said elements.
  • Such a cursor positioning device in accordance with the present invention has other interesting characteristics, which will be more explicitly discussed below, and in particular means allowing the delivery of finished bags, open or closed, as well as carrying out a test of the good functioning of each cursor.
  • the chassis of the device has been referenced in 1 and the two rollers, forming between them a passage for the coupling profiles, in 2.
  • These rollers which are rotatable around axes 2a, and have a groove 2b, are each mounted at the free end of an arm 3 mounted to pivot about an axis 4.
  • the other end of the arms 3 is connected by a link 5 to a common axis 6 secured to a mobile support 7.
  • the axes articulated connecting the arms 3 to the links 5 have been referenced at 8.
  • the position, in abutment, of the movable support 7 relative to the chassis 1, can be adjusted by the rotation of a knurled button 9 mounted at the end of a screw 10 screwed into the support and whose free end comes abut, at 11, on one end of the chassis 1.
  • a lock nut 12 allows, after adjustment, and by tightening on the wall 13 of the support 7, to fix the position of the screw 10 relative to the support 7.
  • the maximum degree of pinching of the two rollers 2 can be adjusted one on the other.
  • the displacement of the mobile support 7, which will control the pivoting of the links 5 and levers 3, and consequently the opening and closing of the rollers 2, is produced by a pneumatic cylinder 14 fixed relative to the chassis 1 and whose threaded end 15 of the piston rod, on which is also mounted an adjusting lock nut 16, is screwed into said support.
  • the automatic control of the supply to the cylinder of the jack 14 is effected by means of a solenoid valve and all appropriate detector means (not shown), this depending on the progress and periodic stops of the superimposed sheets of material.
  • plastic scrolling (in the direction of arrow F), which have been referenced in 17 and bear on their longitudinal free edges of the coupling profile elements 18 (in FIG. 2, a slider mounted in operational position on the profiles 18 a was referenced in 19).
  • the articulation axes 4 are integral with a carriage 20 mounted to slide on the chassis 1.
  • the sliding of the carriage 20 relative to the chassis 1 is ensured on each side by lateral slides 21, with retention ensured by the intermediate two lateral grooves 22 of the chassis, on each of which slides the head 23 of a screw 24 fixed in said carriage 20.
  • the carriage 20 can be resiliently locked on the frame 1 by the rounded end 25, urged outward by an internal spring, with an elastic lock screw 26 to nut 27 fixed on the carriage 20, this end being able to occupy one of two notches 28 or 29 of the chassis 1.
  • the operation of the device which has just been described is as follows: a cursor 19 having arrived in the position shown in FIG. 3, the jack 14 was controlled, during the preceding cycle time, so that its rod is retracted as far as possible into its body, which has brought the movable support 7 into the front stop position shown in FIG. 2. The rounded end 25 of the elastic lock 26 then occupies the notch 29.
  • rollers and the various axes of the system are in the position for which the references which designate them, and which are the same as in the other figures, are assigned the index 1 (and so on: 2 , 3 and 4 for the following times of the operating cycle).
  • the stopping of the sheets 17 is produced by an electric brake acting on the rollers, with the production of a control signal for the second cycle time: the rod of the jack 14 comes out and moves the movable support 7 away from the chassis 1 , which causes the rollers 2 to open (their axes come in 2a 2 in FIG. 3).
  • rollers 2 (axes in position 2a 3 ) are then always in the open position, but behind the slider 19.
  • the jack 14 is then controlled in the opposite direction, which causes the rollers 2 to close behind the slider 19.
  • the rollers are then in position 2a 4 in FIG. 3 (fourth step of the cycle).
  • This arrangement has the advantage of testing the correct operation of the slider 19 which, if it is defective or improperly engaged on the sections 18, is ejected, which allows an easy and rapid observation of the defect. In addition, this leaves enough room at the rear end of the profiles 18 (behind the cursor) to allow the welding point to be made on the profiles, this welding point constituting a stop for the cursor on the future. bag.
  • Open bags can be obtained (with the exception of the short length closed at the rear, which has just been mentioned), if the rollers 2, being in the maximum closed position, do not cause an inter-engagement of the profiles coupling 18 during the first time of the cycle. In fact, when the cursor is blocked by the rollers 2 in position 2 1 and the sheets are advancing, this cursor causes disengagement of the profiles 18, which are coupled at the level of the device for fitting the sliders.
  • the invention makes it possible to obtain open or closed bags, of variable widths, without it being necessary to modify the distance which separates the apparatus for installing cursors from the welding and cutting blade, with sliders whose proper functioning has been tested, and which are always at a determined distance from the rear end of the profiles, on each bag.

Description

La présente invention concerne d'une façon générale une machine pour la fabrication de sacs en matière plastique constitués de deux feuilles superposées soudées le long de leurs bords latéraux, le fond restant ouvert ou étant fermé par une ligne de soudage ou de pliage, ces sacs étant équipés d'éléments profilés d'accouplement s'étendant le long des bords de leur ouverture et pouvant s'accoupler par déformation élastique par pression sous l'effet du coulissement d'un curseur, cette machine comportant, entre autres, de façon connue, en aval d'une extrudeuse produisant les feuilles, d'une part un appareil de pose automatique de curseurs, en position opérationnelle, sur des éléments profilés d'accouplement qui s'étendent selon les bords longitudinaux de deux feuilles superposées en défilement, et d'autre part une lame de soudage et de coupe propre à effectuer à la cadence voulue, et ceci lors d'arrêts périodiques du défilement des feuilles, des lignes de soudage transversales constituant les bords latéraux des sacs.The present invention relates generally to a machine for the manufacture of plastic bags consisting of two superimposed sheets welded along their lateral edges, the bottom remaining open or being closed by a welding or folding line, these bags being equipped with profiled coupling elements extending along the edges of their opening and capable of being coupled by elastic deformation by pressure under the effect of the sliding of a slider, this machine comprising, inter alia, in known manner , downstream of an extruder producing the sheets, on the one hand an apparatus for automatically placing sliders, in operational position, on profiled coupling elements which extend along the longitudinal edges of two sheets superimposed in movement, and on the other hand, a welding and cutting blade suitable for carrying out at the desired rate, and this during periodic stops in the running of the sheets, transverse welding lines constituting the side edges of the bags.

Actuellement, certains types de sacs de matière plastique sont élaborés à partir de feuilles d'une telle matière et comportent deux parois opposées en principe soudées par leurs bords latéraux, un pli de la feuille ou une autre ligne de soudure constituant le fond, à moins que les.sacs ne soient fournis avec un fond ouvert (FR-A-1 537 729). A l'opposé du fond s'étendent, le long des bords de l'ouverture du sac, deux éléments profilés, à savoir un sur chaque paroi, lesquels éléments ont des formes complémentaires et peuvent ainsi s'accoupler en se déformant élastiquement par pression sous l'effet du coulissement d'un curseur, ce qui permet commodément à l'utilisateur d'ouvrir ou de fermer le sac de façon répétitive, par simple déplacement du curseur le long desdits éléments. Le curseur est arrêté à chaque extrémité par un point de soudure à l'emplacement duquel les deux profilés sont aplatis et solidarisés, à proximité des bords latéraux des sacs.Currently, certain types of plastic bags are made from sheets of such material and have two opposite walls in principle welded by their lateral edges, a fold of the sheet or another weld line constituting the bottom, unless that the bags are not supplied with an open bottom (FR-A-1 537 729). Opposite the bottom extend, along the edges of the opening of the bag, two profiled elements, namely one on each wall, which elements have complementary shapes and can thus be coupled by deforming elastically by pressure. under the effect of the sliding of a cursor, which conveniently allows the user to open or close the bag repeatedly, by simply moving the cursor along said elements. The cursor is stopped at each end by a welding point at the location where the two profiles are flattened and secured, near the side edges of the bags.

Ces sacs sont élaborés en continu à grande cadence, par un procédé d'extrusion, le principe général de fabrication consistant pour l'essentiel à faire défiler deux feuilles superposées qui se déplacent dans la direction de leur longueur, feuilles sur lesquelles une lame de soudage et de coupe descend pour effectuer à la cadence voulue (en fonction de la vitesse de défilement des feuilles et de la largeur désirée pour les sacs), et ceci lors d'un arrêt du défilement, des lignes de soudage transversales constituant les bords latéraux des sacs.These bags are produced continuously at a high rate, by an extrusion process, the general manufacturing principle consisting essentially of scrolling two superimposed sheets which move in the direction of their length, sheets on which a welding blade and cutting down to perform at the desired rate (depending on the speed of movement of the sheets and the desired width for the bags), and this when the scrolling stops, transverse welding lines constituting the lateral edges of the bags.

Lesdits éléments profilés d'accouplement peuvent être extrudés en même temps que la feuille et constituer une partie intégrante de celle-ci, ou être élaborés séparément et être rapportés en continu sur les bords longitudinaux respectifs des feuilles, par soudage ou par collage.Said profiled coupling elements can be extruded at the same time as the sheet and constitute an integral part thereof, or be produced separately and be attached continuously to the respective longitudinal edges of the sheets, by welding or by bonding.

Un appareil approprié, tel par exemple celui qui fait l'objet du brevet d'invention français FR-A-2 491 742 effectue automatiquement la pose desdits curseurs, qui viennent, en position opérationnelle, coiffer lesdits éléments profilés d'accouplement sur chaque largeur de sac. Cette pose automatique des curseurs s'effectue - bien entendu également à la cadence voulue - en amont du poste de soudage et de coupe transversale des feuilles.A suitable device, such as that which is the subject of the French invention patent FR-A-2 491 742 automatically installs the said sliders, which come, in the operational position, to cover the said profiled coupling elements over each width of bag. This automatic positioning of the sliders is carried out - of course also at the desired rate - upstream of the welding station and cross section of the sheets.

Ceci étant, le problème se pose du_ positionnement de chaque curseur selon la longueur desdits éléments profilés d'accouplement, compte tenu du fait que la machine doit pouvoir livrer des sacs de largeur variable. Pour éviter que certains curseurs se trouvent positionnés à l'emplacement auquel il est prévu d'effectuer les points de soudure mentionnés plus haut, ce qui serait la cause d'un incident de fonctionnement, il est en général nécessaire, lorsque l'on passe d'une largeur de sac à une largeur différente, de déplacer l'appareil de pose de curseurs, pour modifier la distance qui le sépare de la lame précitée de soudage et de coupe, et faire en sorte que cette distance reste un multiple exact de la largeur des sacs. Autrement, en effet, les curseurs pourraient se trouver positionnés en des emplacements de la largeur des sacs qui se décaleraient progressivement vers l'un des bords latéraux de ceux-ci, ce qui aboutirait inévitablement à l'incident de fonctionnement précité.That said, the problem arises of the positioning of each slider along the length of said profiled coupling elements, taking into account the fact that the machine must be able to deliver bags of variable width. To prevent certain cursors from being positioned at the location at which it is planned to carry out the welding points mentioned above, which would be the cause of a malfunction, it is generally necessary, when passing from a bag width to a different width, to move the slider setting device, to modify the distance which separates it from the aforementioned welding and cutting blade, and to ensure that this distance remains an exact multiple of the width of the bags. Otherwise, in fact, the sliders could be positioned at locations the width of the bags which would shift progressively towards one of the lateral edges of the latter, which would inevitably lead to the abovementioned operating incident.

L'un des buts de la présente invention est d'éviter l'inconvénient que représente le fait d'avoir à déplacer plus ou moins fréquemment l'appareil de pose de curseurs, qui est relativement lourd et encombrant, et de faire en sorte qu'il puisse être fixe, tout en évitant aussi, automatiquement et en toute sécurité, le risque de tout incident de fonctionnement.One of the aims of the present invention is to avoid the disadvantage of having to move the slider installation device, which is relatively heavy and bulky, more or less frequently, and to ensure that '' it can be fixed, while also automatically and safely avoiding the risk of any operational incident.

A cet effet, une machine du type général indiqué au début est, conformément à la présente invention, caractérisée en ce qu'elle comporte en outre, entre ledit appareil de pose de curseurs et ladite lame de soudage et de coupe, un appareil de positionnement automatique desdits curseurs sur lesdits éléments profilés d'accouplement, propre à les amener à une distance déterminée de l'emplacement prévu pour lesdites lignes de soudage transversales, quelle que soit la largeur prévue pour lesdits sacs.To this end, a machine of the general type indicated at the beginning is, in accordance with the present invention, characterized in that it further comprises, between said apparatus for placing cursors and said welding and cutting blade, a positioning apparatus automatic said sliders on said coupling coupling elements, adapted to bring them at a determined distance from the location provided for said transverse welding lines, regardless of the width provided for said bags.

On évite ainsi tout risque qu'un curseur distribué par l'appareil de pose « tombe à l'emplacement prévu pour lesdites lignes de soudage transversales, et donc tout risque de voir se produire le type d'incident de fonctionnement consistant en ce que la lame de soudage et de coupe écrase un curseur.This avoids any risk that a cursor distributed by the setting device "falls to the location provided for said transverse welding lines, and therefore any risk of occurring the type of operating incident consisting in that the welding and cutting blade crushes a cursor.

De la sorte, l'appareil de pose de curseurs pourra être fixe, ce qui pourra être plus particulièrement avantageux lorsqu'il est prévu que cet appareil travaille sur des feuilles en défilement dont au moins une partie du parcours est verticale, disposition qui rend plus simples et plus fiables les moyens d'alimentation de l'appareil en curseurs, puisque ceux-ci se déplacent alors par simple gravité dans une goulotte verticale.In this way, the cursor fitting device can be fixed, which can be more particularly advantageous when it is planned that this device works on sheets in movement, at least part of the course of which is vertical, an arrangement which makes it more simple and more reliable the means of supplying the device with sliders, since these then move by simple gravity in a vertical chute.

Ainsi, une caractéristique complémentaire d'une machine conforme à l'invention pourra consister en ce que ledit appareil de pose de curseurs est fixe et opère sur une partie verticale du parcours des feuilles en défilement.Thus, an additional characteristic of a machine according to the invention may consist in that said slider fitting device is fixed and operates on a vertical part of the path of the sheets in movement.

La présente invention concerne par ailleurs, et plus particulièrement, la structure et le mode de fonctionnement dudit appareil de positionnement automatique des curseurs.The present invention also relates, and more particularly, to the structure and the operating mode of said automatic cursor positioning device.

Selon une caractéristique de l'invention, à cet égard, ledit appareil sera caractérisé en ce qu'il comporte pour l'essentiel un châssis, un passage prévu pour permettre le défilement desdits éléments profilés d'accouplement qui s'étendent le long des bords longitudinaux de deux feuilles superposées, et, de part et d'autre de ce passage, deux galets se faisant face, montés aux extrémités libres de deux bras pivotants et aptes, entre autres mouvements, soit à s'écarter l'un de l'autre, pour laisser libre le passage à un curseur monté sur lesdits éléments profilés, soit à se rapprocher l'un de l'autre, et empêcher momentanément ce passage, ce qui, le défilement des feuilles se poursuivant, provoque un déplacement longitudinal, d'amplitude déterminée, dudit curseur sur lesdits éléments.According to a characteristic of the invention, in this regard, said device will be characterized in that it essentially comprises a chassis, a passage provided for allowing the scrolling of said profiled coupling elements which extend along the edges longitudinal of two superimposed sheets, and, on either side of this passage, two facing rollers, mounted at the free ends of two pivoting arms and capable, among other movements, of moving away from one of the other, to allow free passage to a slider mounted on said profiled elements, or to approach one another, and momentarily prevent this passage, which, the scrolling of the sheets continuing, causes a longitudinal displacement, d 'determined amplitude, of said cursor on said elements.

On peut ainsi amener automatiquement et commodément les curseurs en un emplacement déterminé de l'espace séparant les emplacements de deux lignes de soudage et de coupe transversales successives, ce qui évite de façon absolument fiable les inconvénients décrits plus haut.It is thus possible to automatically and conveniently bring the cursors to a determined location in the space separating the locations of two successive welding and transverse cutting lines, which absolutely avoids the drawbacks described above.

Un tel appareil de positionnement de curseurs conforme à la présente invention comporte d'autres caractéristiques intéressantes, dont il sera plus explicitement question ci-après, et en particulier des moyens permettant la livraison de sacs terminés ouverts ou fermés, ainsi que d'effectuer un essai du bon fonctionnement de chaque curseur.Such a cursor positioning device in accordance with the present invention has other interesting characteristics, which will be more explicitly discussed below, and in particular means allowing the delivery of finished bags, open or closed, as well as carrying out a test of the good functioning of each cursor.

Un mode d'exécution d'un appareil de positionnement de curseurs conforme à l'invention va maintenant être décrit à titre d'exemple nullement limitatif, avec référence aux figures du dessin annexé dans lequel :

  • la figure 1 est une vue en plan schématique et partielle de cet appareil ;
  • la figure 2 est une vue en coupe axiale par la ligne II-II de la figure 1 ; et
  • la figure 3 montre schématiquement la cinématique des galets de l'appareil.
An embodiment of a cursor positioning device according to the invention will now be described by way of nonlimiting example, with reference to the figures of the appended drawing in which:
  • Figure 1 is a schematic and partial plan view of this apparatus;
  • Figure 2 is an axial sectional view through line II-II of Figure 1; and
  • Figure 3 shows schematically the kinematics of the rollers of the device.

Sur les différentes figures, ce que l'on peut appeler le châssis de l'appareil a été référencé en 1 et les deux galets, formant entre eux un passage pour les profilés d'accouplement, en 2. Ces galets, qui sont rotatifs autour d'axes 2a, et comportent une gorge 2b, sont montés chacun à l'extrémité libre d'un bras 3 monté pivotant autour d'un axe 4. L'autre extrémité des bras 3 est reliée par une biellette 5 à un axe commun 6 solidaire d'un support mobile 7. Les axes reliant de façon articulée les bras 3 aux biellettes 5 ont été reférencés en 8.In the various figures, what can be called the chassis of the device has been referenced in 1 and the two rollers, forming between them a passage for the coupling profiles, in 2. These rollers, which are rotatable around axes 2a, and have a groove 2b, are each mounted at the free end of an arm 3 mounted to pivot about an axis 4. The other end of the arms 3 is connected by a link 5 to a common axis 6 secured to a mobile support 7. The axes articulated connecting the arms 3 to the links 5 have been referenced at 8.

La position, en butée, du support mobile 7 par rapport au châssis 1, peut être réglée grâce à la rotation d'un bouton moleté 9 monté à l'extrémité d'une vis 10 vissée dans le support et dont l'extrémité libre vient buter, en 11, sur une extrémité du châssis 1. Un contre-écrou 12 permet, après réglage, et par serrage sur la paroi 13 du support 7, de fixer la position de la vis 10 par rapport au support 7.The position, in abutment, of the movable support 7 relative to the chassis 1, can be adjusted by the rotation of a knurled button 9 mounted at the end of a screw 10 screwed into the support and whose free end comes abut, at 11, on one end of the chassis 1. A lock nut 12 allows, after adjustment, and by tightening on the wall 13 of the support 7, to fix the position of the screw 10 relative to the support 7.

Grâce à ces moyens, on pourra régler le degré de pincement maximum des deux galets 2 l'un sur l'autre.Thanks to these means, the maximum degree of pinching of the two rollers 2 can be adjusted one on the other.

Le déplacement du support mobile 7, qui commandera le pivotement des biellettes 5 et leviers 3, et par suite l'ouverture et la fermeture des galets 2, est produit par un vérin pneumatique 14 fixe par rapport au châssis 1 et dont l'extrémité filetée 15 de tige de piston, sur laquelle est monté aussi un contre-écrou de réglage 16, est vissée dans ledit support. La commande automatique de l'alimentation du cylindre du vérin 14 s'effectue au moyen d'une électro-vanne et de tous moyens détecteurs appropriés (non représentés), ceci en fonction de l'avancement et des arrêts périodiques des feuilles superposées de matière plastique en défilement (dans le sens de la flèche F), lesquelles ont été référencées en 17 et portent sur leurs bords libres longitudinaux des éléments profilés d'accouplement 18 (sur la figure 2, un curseur monté en position opérationnelle sur les profilés 18 a été référencé en 19).The displacement of the mobile support 7, which will control the pivoting of the links 5 and levers 3, and consequently the opening and closing of the rollers 2, is produced by a pneumatic cylinder 14 fixed relative to the chassis 1 and whose threaded end 15 of the piston rod, on which is also mounted an adjusting lock nut 16, is screwed into said support. The automatic control of the supply to the cylinder of the jack 14 is effected by means of a solenoid valve and all appropriate detector means (not shown), this depending on the progress and periodic stops of the superimposed sheets of material. plastic scrolling (in the direction of arrow F), which have been referenced in 17 and bear on their longitudinal free edges of the coupling profile elements 18 (in FIG. 2, a slider mounted in operational position on the profiles 18 a was referenced in 19).

Quant aux axes d'articulation 4, ils sont solidaires d'un chariot 20 monté coulissant sur le châssis 1. Le coulissement du chariot 20 par rapport au châssis 1 est assuré de chaque côté par des coulisses latérales 21, avec retenue assurée par l'intermédiaire de deux gorges latérales 22 du châssis, sur chacune desquelles coulisse la tête 23 d'une vis 24 fixée dans ledit chariot 20.As for the articulation axes 4, they are integral with a carriage 20 mounted to slide on the chassis 1. The sliding of the carriage 20 relative to the chassis 1 is ensured on each side by lateral slides 21, with retention ensured by the intermediate two lateral grooves 22 of the chassis, on each of which slides the head 23 of a screw 24 fixed in said carriage 20.

Enfin, et dans un but qui sera vu par la suite, le chariot 20 peut être verrouillé élastiquement sur le châssis 1 par l'extrémité arrondie 25, sollicitée vers l'extérieur par un ressort interne, d'une vis de verrou élastique 26 à écrou 27 fixée sur le chariot 20, cette extrémité pouvant venir occuper l'une de deux encoches 28 ou 29 du châssis 1.Finally, and for a purpose which will be seen later, the carriage 20 can be resiliently locked on the frame 1 by the rounded end 25, urged outward by an internal spring, with an elastic lock screw 26 to nut 27 fixed on the carriage 20, this end being able to occupy one of two notches 28 or 29 of the chassis 1.

Ceci étant, le fonctionnement de l'appareil qui vient d'être décrit est le suivant : un curseur 19 étant arrivé dans la position représentée à la figure 3, le vérin 14 a été commandé, lors du temps précédent du cycle, de sorte que sa tige est rentrée au maximum dans son corps, ce qui a amené le support mobile 7 dans la position avant de butée représentée à la figure 2. L'extrémité arrondie 25 du verrou élastique 26 occupe alors l'encoche 29.That said, the operation of the device which has just been described is as follows: a cursor 19 having arrived in the position shown in FIG. 3, the jack 14 was controlled, during the preceding cycle time, so that its rod is retracted as far as possible into its body, which has brought the movable support 7 into the front stop position shown in FIG. 2. The rounded end 25 of the elastic lock 26 then occupies the notch 29.

Ce déplacement du support mobile 7 vers l'avant, c'est-à-dire vers le bas, a provoqué le rapprochement maximum des deux galets 2 l'un vers l'autre, par suite du pivotement des biellettes 5 et bras 3 ; ces galets empêchent alors le passage vers l'avant dudit curseur 19, lequel reste bloqué derrière les galets 2, tandis que les feuilles 17 continuent à défiler dans le sens de la flèche F. L'emplacement de la ligne de soudage et de coupe transversale arrière des feuilles avance donc vers le curseur 19, lequel se trouvera ainsi, sur le sac correspondant une fois terminé, à proximité de l'extrémité arrière des profilés d'accouplement 18.This displacement of the movable support 7 forward, that is to say downward, has caused the maximum approximation of the two rollers 2 towards one another, as a result of the pivoting of the links 5 and arms 3; these rollers then prevent the passage forward of said slider 19, which remains blocked behind the rollers 2, while the sheets 17 continue to scroll in the direction of the arrow F. The location of the welding line and rear cross section of the sheets therefore advances towards the cursor 19, which will thus be, on the corresponding bag when finished, near the rear end of the coupling profiles 18.

Sur la figure 3, les galets et les différents axes du système sont dans la position pour laquelle les références qui les désignent, et qui sont les mêmes que sur les autres figures, sont affectées de l'indice 1 (et ainsi de suite : 2, 3 et 4 pour les temps suivants du cycle de fonctionnement).In FIG. 3, the rollers and the various axes of the system are in the position for which the references which designate them, and which are the same as in the other figures, are assigned the index 1 (and so on: 2 , 3 and 4 for the following times of the operating cycle).

A ce moment, l'arrêt des feuilles 17 est produit par un frein électrique agissant sur les rouleaux, avec production d'un signal de commande du second temps du cycle : la tige du vérin 14 sort et écarte le support mobile 7 du châssis 1, ce qui provoque l'ouverture des galets 2 (leurs axes viennent en 2a2 sur la figure 3).At this time, the stopping of the sheets 17 is produced by an electric brake acting on the rollers, with the production of a control signal for the second cycle time: the rod of the jack 14 comes out and moves the movable support 7 away from the chassis 1 , which causes the rollers 2 to open (their axes come in 2a 2 in FIG. 3).

Lorsque les galets sont à pleine ouverture et que les bras 3 sont alors bloqués (dans la position de la figure 1), une poursuite de la manoeuvre du vérin 14 provoque un déplacement du chariot 20 vers l'arrière, c'est-à-dire vers le haut, l'extrémité arrondie 25 du verrou élastique 26 quittant l'encoche 29 du châssis pour venir occuper l'encoche 28. Le système est alors arrivé au troisième temps du cycle de son fonctionnement (indices 3 des références sur la figure 3).When the rollers are at full opening and the arms 3 are then locked (in the position of FIG. 1), further operation of the jack 14 causes the carriage 20 to move backwards, that is to say say upwards, the rounded end 25 of the elastic lock 26 leaving the notch 29 of the chassis to occupy the notch 28. The system then arrived at the third stage of the cycle of its operation (indices 3 of the references in the figure 3).

Les galets 2 (axes en position 2a3) sont alors toujours en position ouverte, mais derrière le curseur 19.The rollers 2 (axes in position 2a 3 ) are then always in the open position, but behind the slider 19.

Le vérin 14 est alors commandé en sens inverse, ce qui provoque la fermeture des galets 2 derrière le curseur 19. Les galets sont alors dans la position 2a4 de la figure 3 (quatrième temps du cycle).The jack 14 is then controlled in the opposite direction, which causes the rollers 2 to close behind the slider 19. The rollers are then in position 2a 4 in FIG. 3 (fourth step of the cycle).

Les galets 2 étant fermés sur les profilés 18, les bras pivotants 3 se trouvent à nouveau bloqués et une poursuite de la manoeuvre du vérin 14 ne peut plus que ramener le chariot 20 vers l'avant, c'est-à-dire vers la position qu'il occupait lors du premier temps du cycle, l'extrémité arrondie 25 du verrou élastique 26 quittant cette fois l'encoche 28 du châssis pour revenir dans l'encoche 29.The rollers 2 being closed on the profiles 18, the pivoting arms 3 are again blocked and continued operation of the jack 14 can only bring the carriage 20 forward, that is to say towards the position it occupied during the first stage of the cycle, the rounded end 25 of the elastic lock 26 leaving this time the notch 28 of the chassis to return to the notch 29.

Lors de ce déplacement vers l'avant du chariot 20 avec les galets 2 fermés (les feuilles 17 étant toujours à l'arrêt), le curseur 19 est légèrement déplacé vers l'avant sur les profilés 18, en provoquant leur accouplement sur une faible longueur.During this forward movement of the carriage 20 with the rollers 2 closed (the sheets 17 still being stopped), the cursor 19 is slightly moved forward on the profiles 18, causing them to couple on a low length.

Cette disposition présente l'avantage de tester le bon fonctionnement du curseur 19 qui, s'il est défectueux ou mal engagé sur les profilés 18, est éjecté, ce qui permet une constatation facile et rapide du défaut. En outre, cela laisse suffisamment de place à l'extrémité arrière des profilés 18 (derrière le curseur) pour permettre d'effectuer le point de soudure sur les profilés, ce point de soudure constituant une butée d'arrêt pour le curseur sur le futur sac.This arrangement has the advantage of testing the correct operation of the slider 19 which, if it is defective or improperly engaged on the sections 18, is ejected, which allows an easy and rapid observation of the defect. In addition, this leaves enough room at the rear end of the profiles 18 (behind the cursor) to allow the welding point to be made on the profiles, this welding point constituting a stop for the cursor on the future. bag.

Ensuite de quoi, étant revenu au premier temps du cycle, les feuilles sont remises en défilement et le fonctionnement du système recommence de la même manière.After which, having returned to the first stage of the cycle, the sheets are put back into scrolling and the operation of the system starts again in the same way.

On peut obtenir des sacs ouverts (à l'exception de la petite longueur fermée à l'arrière, dont il vient d'être question), si les galets 2, étant en position fermée maximale, ne provoquent pas un inter-engagement des profilés d'accouplement 18 pendant le premier temps du cycle. En effet, lorsque le curseur est bloqué par les galets 2 en position 21 et que les feuilles avancent, ce curseur provoque un désengagement des profilés 18, lesquels sont accouplés au niveau de l'appareil de pose des curseurs.Open bags can be obtained (with the exception of the short length closed at the rear, which has just been mentioned), if the rollers 2, being in the maximum closed position, do not cause an inter-engagement of the profiles coupling 18 during the first time of the cycle. In fact, when the cursor is blocked by the rollers 2 in position 2 1 and the sheets are advancing, this cursor causes disengagement of the profiles 18, which are coupled at the level of the device for fitting the sliders.

En agissant sur le bouton moleté 9, on peut toutefois faire en sorte qu'en position fermée au maximum les galets 2 pincent suffisamment les profilés 18 pendant le premier temps du cycle pour en provoquer l'accouplement. On obtient alors des sacs entièrement fermés.By acting on the knurled button 9, it is however possible to ensure that in the closed position as much as possible the rollers 2 pinch the sections 18 sufficiently during the first time of the cycle to cause them to couple. We then obtain fully closed bags.

On voit ainsi que l'invention permet d'obtenir des sacs ouverts ou fermés, de largeurs variables, sans qu'il soit nécessaire de modifier la distance qui sépare l'appareil de pose de curseurs de la lame de soudage et de coupe, avec des curseurs dont le bon fonctionnement a été testé, et qui se trouvent toujours à une distance déterminée de l'extrémité arrière des profilés, sur chaque sac.It can thus be seen that the invention makes it possible to obtain open or closed bags, of variable widths, without it being necessary to modify the distance which separates the apparatus for installing cursors from the welding and cutting blade, with sliders whose proper functioning has been tested, and which are always at a determined distance from the rear end of the profiles, on each bag.

Comme il va de soi, et comme il résulte d'ailleurs déjà de ce qui précède, l'invention ne se limite nullement à ceux de ses modes d'application et de réalisation qui ont été plus particulièrement envisagés ; elle en embrasse, au contraire, toutes les variantes.As goes without saying, and as it already follows from the above, the invention is in no way limited to those of its modes of application and embodiments which have been more particularly envisaged; on the contrary, it embraces all its variants.

Claims (13)

1. A machine for making plastic bags comprising two superposed sheets welded along their side edges, the base remaining open or being closed by a weld or fold line, said bags being provided with connecting section members which extend along the edges of their opening and which can be connected by elastic deformation by pressure in response to the sliding of a slider, said machine comprising inter alia in known manner, downstream of an extruder which produces the sheets, firstly, a device for automatically fitting sliders in the operational position to the connecting section members extending along the longitudinal edges of two superposed sheets in movement, and, second, a welding and cutting blade adapted to effect transverse welding lines forming the side edges of the bags at the required rate, during periodic stoppages of the movement of the sheets, characterised in that the machine also comprises, between said slider fitting device and said welding and cutting blade, a device for automatic positioning of said sliders on said connecting section members adapted to bring them to a given distance from the place required for said transverse weld lines irrespective of the proposed width of said bags.
2. A machine according to claim 1, characterised in that the said slider fitting device is stationary and operates on a vertical part of the path of the moving sheets.
3. A device for automatically positioning sliders for a machine according to claim 1 or 2, characterised in that it comprises essentially a frame (1), a passage adapted to allow movement of said connecting section members (18) extending along the longitudinal edges of two superposed sheets (17) and, on either side of said passage, two facing rollers (2) mounted at the free ends of two pivoting arms (3) and adapted, in addition to other movements, either to move apart to leave the passage free for a slider (19) mounted on said section members, or move together and temporarily prevent such passage, as a result of which, with continued movement of the sheets, there is a longitudinal relative movement of a given amplitude of said slider on said members.
4. A device according to claim 3, characterised in that the ends remote from the free ends of the two arms (3) are pivotally connected each to a link (5), the two links (5) being connected to a common pivot (6) mounted on a movable support (7) operatively connected to a drive means - a pneumatic jack (14) or the like - automatically controlled in dependence on the feed and periodic stoppages of said sheets (17).
5. A device according to claim 4, characterised in that the position of maximum movement of the movable support (7) and the frame (1) towards one another is determined by an adjustable stop (9, 10).
6. A device according to claim 5, characterised in that abutment against the stop is provided by the free end of a screw (10) screwed in the movable support (7), which end can abut a wall (11) of the frame (1), the other end of said screw being provided with a knurled adjusting knob (9).
7. A device according to any one of claims 4 to 6, characterised in that the said arms (3) are each mounted for rotation about a pivot (4), the two pivots (4) being connected to a carriage (20) guided for longitudinal sliding on said frame (1).
8. A device according to claim 7, characterised in that the said sliding carriage (20) can be elastically locked in two different longitudinally spaced positions on said frame (1).
9. A device according to claim 8, characterised in that the elastic locking is provided by the rounded end (25) of an elastic locking screw (26) connected to the carriage (20), said end being adapted to engage elastically and selectively in one or other of two notches (28, 29) of said frame.
10. Method of operating a device according to any one of claims 3 to 9, characterised by a first stage of the operating cycle during which the two rollers (4) are brought towards one another to the maximum, clamping the said section members (18), thus blocking the advance of the slider (19), which abuts behind the rollers.
11. A method of operation according to claim 10, characterised by a second stage of the operating cycle during which, movement of said superposed sheets (17) being temporarily stopped, the two rollers (2) are open so as to be able to pass on either side of the slider (19), when the position intended on said sheets for the future transverse welding and cutting line reaches a - relatively short - given distance behind said slider (19).
12. A method of operation according to claim 10 or 11, characterised by a third stage of the operating cycle during which, as from full opening of the rollers (2), the sliding carriage (20) is elastically unlocked with respect to the frame (1), so that it can slide rearwardly by the action of the drive means, into a relative position in which it elastically relocks on said frame, the rollers (2) still remaining in the fully open position but then being situated rearwardly of said slider (19).
13. A method of operation according to any one of claims 10 to 12, characterised by a fourth stage in the operating cycle during which actuation of said drive means in the reverse direction initially results in the rollers closing on the connecting section members (18) and then, from the time when the rollers are closed on said section members, elastic unlocking of the sliding carriage (20) with respect to the frame (1) and an advance of said carriage, during which movement, until the carriage relocks in the first elastic locking position aforesaid, the slider is slid a short length on the connecting members from its most rearward position, thus enabling proper operation thereof to be tested.
EP83401730A 1982-08-31 1983-08-31 Machine and working cycle for making plastic bags with a zip fastener and device for positioning them Expired EP0102301B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8214887A FR2532162B1 (en) 1982-08-31 1982-08-31 MACHINE FOR MANUFACTURING PLASTIC BAGS WHICH CAN BE OPENED OR CLOSED BY A CURSOR, CURSOR POSITIONING APPARATUS, EQUIPPED WITH SUCH A MACHINE; HOW IT WORKS
FR8214887 1982-08-31

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EP0102301A2 EP0102301A2 (en) 1984-03-07
EP0102301A3 EP0102301A3 (en) 1985-05-29
EP0102301B1 true EP0102301B1 (en) 1987-11-11

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EP83401730A Expired EP0102301B1 (en) 1982-08-31 1983-08-31 Machine and working cycle for making plastic bags with a zip fastener and device for positioning them

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US (1) US4581006A (en)
EP (1) EP0102301B1 (en)
DE (1) DE3374377D1 (en)
FR (1) FR2532162B1 (en)

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EP0102301A2 (en) 1984-03-07
US4581006A (en) 1986-04-08
EP0102301A3 (en) 1985-05-29
FR2532162A1 (en) 1984-03-02
DE3374377D1 (en) 1987-12-17
FR2532162B1 (en) 1986-05-09

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