EP0677443A1 - Apparatus for transversal sealing in a packaging machine for tubular foils - Google Patents

Apparatus for transversal sealing in a packaging machine for tubular foils Download PDF

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Publication number
EP0677443A1
EP0677443A1 EP95105472A EP95105472A EP0677443A1 EP 0677443 A1 EP0677443 A1 EP 0677443A1 EP 95105472 A EP95105472 A EP 95105472A EP 95105472 A EP95105472 A EP 95105472A EP 0677443 A1 EP0677443 A1 EP 0677443A1
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EP
European Patent Office
Prior art keywords
drive
cross seal
sealing
stripping
cross
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
EP95105472A
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German (de)
French (fr)
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EP0677443B1 (en
Inventor
Hartmut Metz
Walter Dr. Baur
Dieter Korzer
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Rovema Verpackungsmaschinen GmbH and Co KG
Rovema GmbH
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Rovema Verpackungsmaschinen GmbH and Co KG
Rovema GmbH
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Publication of EP0677443A1 publication Critical patent/EP0677443A1/en
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Publication of EP0677443B1 publication Critical patent/EP0677443B1/en
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    • 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
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes

Definitions

  • the invention relates to a cross-sealing device for a tubular bag packaging machine with at least one pair of cross-sealing jaws, which can be placed on a plastic tube that may be moved in the direction of its longitudinal axis, in this case transverse to its longitudinal axis by a transverse sealing seam in each case in individual tubular bags.
  • a cross seal device of this type is already known from German Offenlegungsschrift DE 37 32 033 A1. It ensures that the area of the later transverse sealing seam is kept free of packaging material until the sealing has taken place.
  • the movement of the scraper bars is included coupled to that of the cross seal jaws in order to avoid failed attempts by such forced guidance. It must be ensured that the stripping bars are already below the cross-sealing jaws when they produce the sealing seam, and they have to move faster along the sealing area than the plastic tube in order to remove any packaging material in the area of the subsequent sealing seam to intervene the previous, actual packaging volume.
  • the scraper bars are connected to the cross seal jaws by means of pivoted levers and, like the cross seal jaws, are guided by a cam control.
  • the invention is therefore based on the object of designing a cross-sealing device of the type specified in the introduction in such a way that highly sensitive and expensive mechanical positive guides for the scraper bars are no longer required and the components used are low-wear and easily replaceable without extensive set-up work, and that they are user-friendly the system can be easily adapted to different packaging tasks.
  • an endless, flexible drive belt is provided on both sides and symmetrically to the sealing area, that the scraper bars are attached in pairs to the two drive belts, and that the drive belts continue from a common one Drive can be driven synchronously via a drive roller and that a control device is also provided for this drive, which controls the movement of the stripping bars independently of the movements of the plastic hose and the cross seal jaws, the drive belts preferably each being formed by an endlessly closed toothed belt become.
  • a fixed mechanical assignment of the movement of the stripping bars to that of the cross seal jaws is no longer necessary in the cross seal device according to the invention.
  • the belt drive provided instead has the advantage that the components used are not subject to constant mechanical wear and require no expensive special manufacture, but can be put together from commercially available parts and easily replaced by replacing them.
  • the special control of the scraper bars allows the cross-sealing device to be adapted to very different packaging tasks, for example taking into account the respective packaged goods and the type and size of the plastic tube used and the tubular bag packaging.
  • An arrangement of the drive belt that is spatially adapted to the movement of the stripping bars occurs when the preferably spur-toothed inside of the drive belt is guided over one of each of the drive rollers and a plurality of first tensioning rollers, the drive roller being expediently provided at the end of the sealing area, so that the stripping bars are pulled
  • the belt of the drive belt is always located when you cover the plastic hose.
  • the drive belts which are arranged symmetrically in space with respect to the sealing area, can be driven easily synchronously in such a way that the drive torque is introduced into the drive rollers by means of a common belt drive connected to the drive. if the slippage of the belt drive on the drive rollers is minimized by at least one second tension roller, it is best that the second tension roller (s) is (are) arranged so that the angle of wrap on the two drive rollers is almost the same.
  • a servo motor is provided for the drive, which is speed-controlled by a position controller which regulates the time-dependent position of the stripping bars, which position can be measured in a simple manner by a proximity switch, for example via a servo amplifier.
  • a position controller which regulates the time-dependent position of the stripping bars, which position can be measured in a simple manner by a proximity switch, for example via a servo amplifier.
  • Such position controls can be carried out very precisely and without inertia, especially with electronic measuring and control means, so that the functional separation of the drives from transverse sealing jaws and stripping bars has no disadvantageous consequences for their spatial assignment.
  • a considerable improvement of the prior art is also the possibility created by the invention of changing the setpoints of such a position control, for which purpose it is expedient if the position controller has an incremental encoder for the speed control of the servo motor.
  • An adjustment can be carried out in a user-friendly manner if a display is provided on the position controller as a setpoint setting for determining the stripping path covered by the stripping bars that clamp the plastic tube and strip the packaging material into the tubular bag packaging within the sealing area.
  • the sealing area is arranged vertically, because the packaged goods are subjected to gravity and cannot flow back into the area of the sealing seam when they have already been stripped off.
  • an upper stripping path piece can be set, which is just below that on the transverse sealing seam adjacent cross seal jaws ends, but it is instead or additionally also possible that a lower stripping path piece is adjustable, which begins just below the cross seal jaws resting on the cross seal seam. Both stripping path pieces together form the stripping path, which can be modified in this way.
  • a transverse sealing device consists of two elastic and arranged mirror-symmetrically on a rectilinear sealing area 1
  • Endless drive belts 2 which are each guided via associated first tensioning rollers 21 and (FIG. 4) are each driven by a drive roller 22.
  • a plastic tube 3 is conveyed vertically downward through the sealing area 1 in the direction specified by a directional arrow 31, packaging material 30 being introduced into the plastic tube 3 in a known manner and not further explained in the drawing.
  • FIG. 1 two mutually movable cross seal jaws 4 are indicated, which are shown in somewhat greater detail in Fig. 4.
  • the cross seal jaws 4 are each provided with two sealing surfaces 41, which produce two parallel cross seal seams on the squeezed plastic tube 3.
  • a cutting device is provided between the sealing surfaces 41, which is omitted in the drawing for the sake of clarity and serves to separate the tubular bag packages 32 from the plastic tube 3.
  • the details are customary.
  • the cross-sealing jaws 4 are synchronized with one another, but are driven independently of the drive belts 2 and only lie temporarily against the plastic tube 3 within the sealing region 1 for the purpose of sealing and separating the tubular bag packaging 32, schematically in FIG. 1 a dotted representation of the cross-seal jaws 4 which have already been removed from the area of the plastic tube 3 is indicated.
  • the way of driving the cross seal jaws 4 is not related to the invention; an example can be found above Publication can be taken.
  • Stripping rods 23 are attached in pairs to the drive belts 2 in such a way that the mirror symmetry of the drive belts 2 is maintained.
  • Fig. 1 two pairs, in Fig. 4 four pairs of scraper strips 23 can be seen, suggesting in this way that the paired number of scraper bars 23 is relatively variable and can be adapted to the respective packaging tasks.
  • a position controller 5 is used as the central control unit for the control of the drive belts 2 of the transverse sealing device according to the invention, which controls the operation of the drive belts 2 as a function of a setpoint value adjustment that can be made on a display 51 and of the actual value for the position of the stripping bars 23 controls, which is measured by a proximity switch 52 (Fig. 4).
  • the input variables obtained in this way are processed electronically in a suitable manner; the output variables dependent thereon for regulating the position, speed and acceleration of the stripping bars 23 are - amplified in a servo amplifier 53 - fed to a servo motor 61 which drives the drive rollers 22 via a gear 62 (FIG. 4).
  • a position control can also take place if the position controller 5 is equipped with an incremental encoder for the speed of the servo motor 61.
  • the stripping path 10 means the distance within the sealing area 1 that is required for complete removal of packaging material 30 from the area of the plastic tube 3 intended for the sealing and within which the stripping bars 32 along the slower moving plastic tube 3, this jammed between them, to be moved.
  • Fig. 3 shows that it is possible to set an "upper” stripping path 10a, which ends just below the position which the cross seal jaws 4 assume during the production of the cross seal seam.
  • a "lower” stripping path 10b begins at this point and extends in the direction of the directional arrow 31.
  • the entire stripping path 10 as well as the stripping path pieces 10a and 10b can be changed within limit values fixed to the device.
  • a drive 6, which consists essentially of the servo motor 61 and the gear 62, drives the drive rollers 22. It is provided with a belt drive 64 according to FIG. 4, second tensioning rollers 63 ensuring that a sufficient wrap angle on the drive rollers 22 is provided slip-free, synchronous drive guaranteed.
  • One fixed piece on the transverse sealing device 7 is underlaid on the drawn run of the respective drive belt 2, so that it cannot deflect when the stripping rods 23 on the plastic hose 3 are effective.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Package Closures (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)

Abstract

Cross-sealing devices for a packaging machine can work with stripper bars (23) moved along the plastic wrapping to be sealed, which ensure that the sealing surfaces are free of the packaged material before the sealing takes place. A drive for the stripping bars allows the stripping paths on the plastic wrapping to be matched to special requirements. For this purpose, there are belt drives (2,64) which are driven independently from the cross-sealing jaws (41) and which are controlled by the unit controlling the position of the stripping bars. <IMAGE>

Description

Die Erfindung betrifft eine Quersiegel-Vorrichtung für eine Schlauchheutel-Verpackungsmaschine mit mindestens einem Paar Quersiegel-Backen, die an einen ggf. in Richtung seiner Längsachse bewegten Kunststoff-Schlauch anlegbar sind, diesen dabei quer zu seiner Längsachse durch jeweils eine Quersiegelnaht in einzelne Schlauchbeutel-Verpackungen teilend, und mit mindestens einem Paar den Quersiegel-Backen vorlaufender, symmetrisch zueinander und parallel zu der Quersiegelnaht angeordneter und gegeneinander und entlang des Siegelbereiches symmetrisch bewegter Abstreifstäbe, die innerhalb und entlang mindestens eines Teiles des Siegelbereiches, den Kunststoff-Schlauch zwischen sich einklemmend, zumindest einen für die Quersiegelnaht vorgesehenen Bereich des Kunststoff-Schlauches so überstreichen, daß das Verpackungsgut aus diesem Bereich in die zu verschließende Schlauchbeutel-Verpackung abgestreift wird.The invention relates to a cross-sealing device for a tubular bag packaging machine with at least one pair of cross-sealing jaws, which can be placed on a plastic tube that may be moved in the direction of its longitudinal axis, in this case transverse to its longitudinal axis by a transverse sealing seam in each case in individual tubular bags. Dividing packaging, and with at least one pair of scraper bars leading the cross seal jaws, arranged symmetrically to one another and parallel to the cross seal seam and symmetrically moved with respect to one another and along the sealing area, which clamps the plastic tube between them inside and along at least part of the sealing area, Paint over at least one area of the plastic tube provided for the transverse sealing seam in such a way that the packaged goods are stripped from this area into the tubular bag packaging to be sealed.

Eine Quersiegel-Vorrichtung dieser Art ist aus der Deutschen Offenlegungsschrift DE 37 32 033 A1 bereits bekannt. Sie sorgt dafür, daß der Bereich der späteren Quersiegelnaht frei von Verpackungsgut gehalten wird, bis die Siegelung erfolgt ist. Die Bewegung der Abstreifstäbe ist dabei an diejenige der Quersiegel-Backen gekoppelt, um durch eine solche Zwangsführung Fehlversuche zu vermeiden. Es muß nämlich sichergestellt sein, daß sich die Abstreifstäbe bereits unterhalb der Quersiegel-Backen befinden, wenn diese die Siegelnaht erzeugen, und sie müssen sich entlang des Siegelbereiches schneller bewegen als der Kunststoff-Schlauch, um das im Bereich der späteren Siegelnaht eventuell vorhandene Verpackungsgut in das vorhergehende, eigentliche Verpackungsvolumen einzustreifen. Die Abstreifstäbe sind zu diesem Zweck an den Quersiegel-Backen mittels schwenkbar gelagerter Hebel angebunden und werden, wie die Quersiegel-Backen auch, durch eine Kurvensteuerung geführt. Die Anordnung erfordert einen erheblichen mechanischen Aufwand und ist wegen der hohen Produktivität einer solchen Quersiegel-Vorrichtung, die an hochleistungsfähigen Schlauchbeutel-Verpackungsmaschinen eingesetzt werden, einem starken Verschleiß unterworfen. In der Regel wird es sich dabei um eine Einzweck-Einrichtung handeln, die an unterschiedliche Verpackungs-Parameter nur schwer angepaßt werden kann.A cross seal device of this type is already known from German Offenlegungsschrift DE 37 32 033 A1. It ensures that the area of the later transverse sealing seam is kept free of packaging material until the sealing has taken place. The movement of the scraper bars is included coupled to that of the cross seal jaws in order to avoid failed attempts by such forced guidance. It must be ensured that the stripping bars are already below the cross-sealing jaws when they produce the sealing seam, and they have to move faster along the sealing area than the plastic tube in order to remove any packaging material in the area of the subsequent sealing seam to intervene the previous, actual packaging volume. For this purpose, the scraper bars are connected to the cross seal jaws by means of pivoted levers and, like the cross seal jaws, are guided by a cam control. The arrangement requires considerable mechanical effort and, due to the high productivity of such a transverse sealing device, which is used on high-performance tubular bag packaging machines, is subject to severe wear. As a rule, this will be a single-purpose device that is difficult to adapt to different packaging parameters.

Die Erfindung hat sich deshalb die Aufgabe gestellt, eine Quersiegel-Vorrichtung der eingangs näher bezeichneten Art so auszubilden, daß hochempfindliche und teure mechanische Zwangsführungen für die Abstreifstäbe nicht mehr erforderlich und die verwendeten Bauteile verschleißarm und ohne umfangreiche Rüstarbeiten leicht ersetzbar sind, und daß eine anwenderfreundlich einfache Anpassung der Anlage an unterschiedliche Verpackungsaufgaben vorgenommen werden kann.The invention is therefore based on the object of designing a cross-sealing device of the type specified in the introduction in such a way that highly sensitive and expensive mechanical positive guides for the scraper bars are no longer required and the components used are low-wear and easily replaceable without extensive set-up work, and that they are user-friendly the system can be easily adapted to different packaging tasks.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß beiderseits und symmetrisch zu dem Siegelbereich je ein endloses, flexibles Antriebsband vorgesehen ist, daß die Abstreifstäbe paarweise an den beiden Antriebsbändern befestigt sind, daß weiterhin die Antriebsbänder von einem gemeinsamen Antrieb über je eine Antriebsrolle synchron angetrieben werden und daß ferner für diesen Antrieb eine Steuereinrichtung vorgesehen ist, welche die Bewegung der Abstreifstäbe unabhängig von den Bewegungen des Kunststoff-Schlauches und der Quersiegel-Backen steuert, wobei die Antriebsbänder vorzugsweise jeweils von einem endlos geschlossenen Zahnriemen gebildet werden.According to the invention the object is achieved in that an endless, flexible drive belt is provided on both sides and symmetrically to the sealing area, that the scraper bars are attached in pairs to the two drive belts, and that the drive belts continue from a common one Drive can be driven synchronously via a drive roller and that a control device is also provided for this drive, which controls the movement of the stripping bars independently of the movements of the plastic hose and the cross seal jaws, the drive belts preferably each being formed by an endlessly closed toothed belt become.

Eine feste mechanische Zuordnung der Bewegung der Abstreifstäbe zu derjenigen der Quersiegel-Backen ist bei der erfindungsgemäßen Quersiegel-Vorrichtung nicht mehr erforderlich. Das stattdessen vorgesehene Bandgetriebe hat den Vorteil, daß die verwendeten Bauelemente keinem beständigen mechanischen Verschleiß unterliegen und keine teure Spezialanfertigung erfordern, sondern aus handelsüblichen Teilen zusammengestellt und durch deren Ersatz problemlos erneuert werden können. Die spezielle Steuerung der Abstreifstäbe erlaubt eine Anpassung der Quersiegel-Vorrichtung an ganz unterschiedliche Verpackungsaufgaben, wobei beispielsweise das jeweilige Verpackungsgut und die Art und Größe des verwendeten Kunststoff-Schlauches und der Schlauchbeutel-Verpackungen berücksichtigt werden können.A fixed mechanical assignment of the movement of the stripping bars to that of the cross seal jaws is no longer necessary in the cross seal device according to the invention. The belt drive provided instead has the advantage that the components used are not subject to constant mechanical wear and require no expensive special manufacture, but can be put together from commercially available parts and easily replaced by replacing them. The special control of the scraper bars allows the cross-sealing device to be adapted to very different packaging tasks, for example taking into account the respective packaged goods and the type and size of the plastic tube used and the tubular bag packaging.

Eine der Bewegung der Abstreifstäbe räumlich angepaßte Anordnung des Antriebsbandes entsteht, wenn die vorzugsweise stirnverzahnte Innenseite des Antriebsbandes über jeweils eine der Antriebsrollen und mehrere erste Spannrollen geführt ist, wobei die Antriebsrolle zweckmäßig am Ende des Siegelbereiches vorgesehen ist, so daß sich die Abstreifstäbe an dem gezogenen Trumm des Antriebsbandes immer dann befinden, wenn sie den Kunststoff-Schlauch überstreichen.An arrangement of the drive belt that is spatially adapted to the movement of the stripping bars occurs when the preferably spur-toothed inside of the drive belt is guided over one of each of the drive rollers and a plurality of first tensioning rollers, the drive roller being expediently provided at the end of the sealing area, so that the stripping bars are pulled The belt of the drive belt is always located when you cover the plastic hose.

Die in Bezug auf den Siegelbereich raumsymmetrisch angeordneten Antriebsbänder können leicht synchron in der Weise angetrieben werden, daß das Antriebsmoment in die Antriebsrollen mittels eines gemeinsamen, mit dem Antrieb verbundenen Riementriebes eingeleitet wird, wobei es günstig ist, wenn dabei der Schlupf des Riementriebes an den Antriebsrollen durch mindestens eine zweite Spannrolle minimiert wird, am besten so, daß die zweite(n) Spannrolle(n) so angeordnet ist (sind), daß der Umschlingungswinkel an den beiden Antriebsrollen nahezu gleich ist.The drive belts, which are arranged symmetrically in space with respect to the sealing area, can be driven easily synchronously in such a way that the drive torque is introduced into the drive rollers by means of a common belt drive connected to the drive. if the slippage of the belt drive on the drive rollers is minimized by at least one second tension roller, it is best that the second tension roller (s) is (are) arranged so that the angle of wrap on the two drive rollers is almost the same.

Ganz besonders vorteilhaft ist es, wenn für den Antrieb ein Servomotor vorgesehen ist, der von einem die zeitabhängige, in einfacher Weise von einem Näherungsschalter meßbare Position der Abstreifstäbe regelnden Lageregler, beispielsweise über einen Servoverstärker, drehzahlgesteuert wird. Derartige Lageregelungen sind vor allem mit elektronischen Meß- und Steuermitteln sehr genau und trägheitslos ausführbar, so daß die funktionale Trennung der Antriebe von Quersiegel-Backen und Abstreifstäben keine nachteiligen Folgen für deren räumliche Zuordnung hat.It is very particularly advantageous if a servo motor is provided for the drive, which is speed-controlled by a position controller which regulates the time-dependent position of the stripping bars, which position can be measured in a simple manner by a proximity switch, for example via a servo amplifier. Such position controls can be carried out very precisely and without inertia, especially with electronic measuring and control means, so that the functional separation of the drives from transverse sealing jaws and stripping bars has no disadvantageous consequences for their spatial assignment.

Eine erhebliche Verbesserung des Standes der Technik bildet auch die von der Erfindung geschaffene Möglichkeit, die Sollgrößen einer solchen Lageregelung zu verändern, wozu es zweckmäßig ist, wenn der Lageregler einen inkrementalen Geber für die Drehzahlsteuerung des Servomotors aufweist. Eine Anpassung kann benutzerfreundlich erfolgen, wenn an dem Lageregler ein Display als Sollwerteinstellung zur Festlegung des von den den Kunststoff-Schlauch klemmenden, das Verpackungsgut in die Schlauchbeutel-Verpackung abstreifenden Abstreifstäben innerhalb des Siegelbereiches zurückgelegten Abstreifweges vorgesehen ist.A considerable improvement of the prior art is also the possibility created by the invention of changing the setpoints of such a position control, for which purpose it is expedient if the position controller has an incremental encoder for the speed control of the servo motor. An adjustment can be carried out in a user-friendly manner if a display is provided on the position controller as a setpoint setting for determining the stripping path covered by the stripping bars that clamp the plastic tube and strip the packaging material into the tubular bag packaging within the sealing area.

In der Regel ist es zweckmäßig, wenn der Siegelbereich senkrecht angeordnet ist, weil das Verpackungsgut dabei der Schwerkraft unterworfen ist und nicht von selbst in den Bereich der Siegelnaht zurückfließen kann, wenn es dort bereits abgestreift worden ist.As a rule, it is expedient if the sealing area is arranged vertically, because the packaged goods are subjected to gravity and cannot flow back into the area of the sealing seam when they have already been stripped off.

Mit Hilfe des Displays kann ein oberes Abstreifwegstück einstellbar sein, das kurz unterhalb der an der Quersiegelnaht anliegenden Quersiegel-Backen endet, es ist aber stattdessen oder zusätzlich auch möglich, daß ein unteres Abstreifwegstück einstellbar ist, das kurz unterhalb der an der Quersiegelnaht anliegenden Quersiegel-Backen erst beginnt. Beide Abstreifwegstücke bilden zusammen den Abstreifweg, der auf diese Weise modifizierbar ist.With the help of the display, an upper stripping path piece can be set, which is just below that on the transverse sealing seam adjacent cross seal jaws ends, but it is instead or additionally also possible that a lower stripping path piece is adjustable, which begins just below the cross seal jaws resting on the cross seal seam. Both stripping path pieces together form the stripping path, which can be modified in this way.

Ein korrektes Abstreifen des Kunststoff-Schlauches kann gewährleistet werden, wenn innerhalb des Siegelbereiches das jeweilige Antriebsband zumindest partiell auf seiner der Schlauchbeutel-Verpackung abgewandten Seite jeweils von einem ortsfesten Anlagestück so hinterfangen ist, daß es seine Lage auch dann beibehält, wenn die an dem Kunststoff-Schlauch anliegenden Abstreifstäbe eine Reaktionskraft auf das Antriebsband ausüben. Eine solche - raumfeste - Anordnung ist wesentlich weniger störanfällig und einem Verschleiß unterworfen wie fortwährend bewegte Hebelsysteme, wie sie bei den aus dem Stand der Technik bekannten Einrichtungen zur Übertragung der erforderlichen Abstreifkräfte vorgesehen werden müssen.Correct stripping of the plastic tube can be ensured if, within the sealing area, the respective drive belt is at least partially undercut by a stationary contact piece on its side facing away from the tubular bag packaging in such a way that it retains its position even when the plastic tube - Apply a reaction force to the drive belt against the wiper rods. Such a - spatially fixed - arrangement is much less susceptible to faults and is subject to wear and tear like continuously moving lever systems, as they have to be provided in the devices known from the prior art for transmitting the required stripping forces.

Die Erfindung wird nachstehend an Hand der Zeichnung an einem Ausführungsbeispiel näher erläutert. Es zeigen

Fig. 1
das mechanische und
Fig. 2
das regelungstechnische Wirkprinzip einer erfindungsgemäßen Quersiegel-Vorrichtung,
Fig. 3
in zwei Teilfiguren die Ausgestaltung eines Abstreifweges sowie
Fig. 4
eine zweckmäßige Anordnung, sämtlich in schematisch vereinfachter Darstellung.
The invention is explained below with reference to the drawing using an exemplary embodiment. Show it
Fig. 1
the mechanical and
Fig. 2
the control engineering principle of operation of a transverse sealing device according to the invention,
Fig. 3
in two figures the design of a stripping path and
Fig. 4
an appropriate arrangement, all in a schematic simplified representation.

Eine erfindungsgemäße Quersiegel-Vorrichtung besteht entsprechend Fig. 1 und 4 aus zwei spiegelsymmetrisch an einem geradlinigen Siegelbereich 1 angeordneten, elastischen und endlosen Antriebsbändern 2, die jeweils über zugehörige erste Spannrollen 21 geführt sind und (Fig. 4) von je einer Antriebsrolle 22 angetrieben werden. Ein Kunststoff-Schlauch 3 wird in der durch einen Richtungspfeil 31 vorgegebenen Richtung senkrecht nach unten durch den Siegelbereich 1 gefördert, wobei in bekannter und in der Zeichnung nicht weiter erläuterter Weise Verpackungsgut 30 in den Kunststoff-Schlauch 3 eingeführt wird.According to FIGS. 1 and 4, a transverse sealing device according to the invention consists of two elastic and arranged mirror-symmetrically on a rectilinear sealing area 1 Endless drive belts 2, which are each guided via associated first tensioning rollers 21 and (FIG. 4) are each driven by a drive roller 22. A plastic tube 3 is conveyed vertically downward through the sealing area 1 in the direction specified by a directional arrow 31, packaging material 30 being introduced into the plastic tube 3 in a known manner and not further explained in the drawing.

In der Fig. 1 sind zwei gegeneinander bewegbare Quersiegel-Backen 4 angedeutet, die in der Fig. 4 etwas ausführlicher gezeichnet sind. Die Quersiegel-Backen 4 sind jeweils mit zwei Siegelflächen 41 versehen, die an dem zusammengequetschten Kunststoff-Schlauch 3 zwei parallele Quersiegelnähte erzeugen. Zwischen den Siegelflächen 41 ist jeweils eine Schneidvorrichtung vorgesehen, die der Übersichtlichkeit wegen in der Zeichnung weggelassen ist und zur Vereinzelung der Schlauchbeutel-Verpackungen 32 aus dem Kunststoff-Schlauch 3 dient. Die Einzelheiten sind fachüblich. Die Quersiegel-Backen 4 sind miteinander synchronisiert, aber unabhängig von den Antriebsbändern 2 angetrieben und legen sich nur innerhalb des Siegelbereiches 1 zeitweilig an den Kunststoff-Schlauch 3 zum Zwecke der Siegelung und Abtrennung der Schlauchbeutel-Verpackungen 32 an, in Fig. 1 schematisch durch eine gepunktete Darstellung der aus dem Bereich des Kunststoff-Schlauches 3 bereits wieder abgezogenen Quersiegel-Backen 4 angedeutet. Die Art und Weise des Antriebs der Quersiegel-Backen 4 steht nicht im Zusammenhang mit der Erfindung; ein Beispiel kann der o.g. Druckschrift entnommen werden.In Fig. 1, two mutually movable cross seal jaws 4 are indicated, which are shown in somewhat greater detail in Fig. 4. The cross seal jaws 4 are each provided with two sealing surfaces 41, which produce two parallel cross seal seams on the squeezed plastic tube 3. A cutting device is provided between the sealing surfaces 41, which is omitted in the drawing for the sake of clarity and serves to separate the tubular bag packages 32 from the plastic tube 3. The details are customary. The cross-sealing jaws 4 are synchronized with one another, but are driven independently of the drive belts 2 and only lie temporarily against the plastic tube 3 within the sealing region 1 for the purpose of sealing and separating the tubular bag packaging 32, schematically in FIG. 1 a dotted representation of the cross-seal jaws 4 which have already been removed from the area of the plastic tube 3 is indicated. The way of driving the cross seal jaws 4 is not related to the invention; an example can be found above Publication can be taken.

An den Antriebsbändern 2 sind paarweise Abstreifstäbe 23 so befestigt, daß die Spiegelsymmetrie der Antriebsbänder 2 erhalten bleibt. In der Fig. 1 sind zwei Paare, in der Fig. 4 vier Paare von Abstreifbändern 23 zu erkennen, auf diese Weise andeutend, daß die paarweise Anzahl der Abstreifstäbe 23 relativ variabel ist und den jeweiligen Verpackungsaufgaben angepaßt werden kann. Je kürzer die Schlauchbeutel-Verpackungen 32 sind, umso mehr Abstreifstäbe 23 müssen paarweise verwendet werden.Stripping rods 23 are attached in pairs to the drive belts 2 in such a way that the mirror symmetry of the drive belts 2 is maintained. In Fig. 1 two pairs, in Fig. 4 four pairs of scraper strips 23 can be seen, suggesting in this way that the paired number of scraper bars 23 is relatively variable and can be adapted to the respective packaging tasks. The shorter the tubular bag packaging 32, the more stripping bars 23 must be used in pairs.

Entsprechend der Fig. 2 ist für die Steuerung der Antriebsbänder 2 der erfindungsgemäßen Quersiegel-Vorrichtung als zentrale Regeleinheit ein Lageregler 5 eingesetzt, der den Betrieb der Antriebsbänder 2 in Abhängigkeit von einer an einem Display 51 vornehmbaren Sollwerteinstellung und von dem Istwert für die Lage der Abstreifstäbe 23 steuert, der durch einen Näherungsschalter 52 (Fig. 4) gemessen wird. Die auf diese Weise gewonnenen Eingangsgrößen werden in geeigneter Weise elektronisch verarbeitet; die davon abhängigen Ausgangsgrößen zur Regelung der Lage, Geschwindigkeit und Beschleunigung der Abstreifstäbe 23 werden - in einem Servoverstärker 53 verstärkt - einem Servomotor 61 zugeführt, der über ein Getriebe 62 (Fig. 4) die Antriebsrollen 22 antreibt. Anstelle einer Lageregelung kann auch eine Lagesteuerung erfolgen, wenn der Lageregler 5 mit einem inkrementalen Geber für die Drehzahl des Servomotors 61 ausgerüstet ist.According to FIG. 2, a position controller 5 is used as the central control unit for the control of the drive belts 2 of the transverse sealing device according to the invention, which controls the operation of the drive belts 2 as a function of a setpoint value adjustment that can be made on a display 51 and of the actual value for the position of the stripping bars 23 controls, which is measured by a proximity switch 52 (Fig. 4). The input variables obtained in this way are processed electronically in a suitable manner; the output variables dependent thereon for regulating the position, speed and acceleration of the stripping bars 23 are - amplified in a servo amplifier 53 - fed to a servo motor 61 which drives the drive rollers 22 via a gear 62 (FIG. 4). Instead of a position control, a position control can also take place if the position controller 5 is equipped with an incremental encoder for the speed of the servo motor 61.

An Hand des Displays 51 ist es möglich, einen Abstreifweg 10 zu modifizieren und zu unterteilen. Der Abstreifweg 10 bedeutet dabei diejenige Strecke innerhalb des Siegelbereiches 1, die für eine vollständige Entfernung von Verpackungsgut 30 aus dem für die Siegelung vorgesehenen Bereich des Kunststoff-Schlauches 3 erforderlich ist und innerhalb derer die Abstreifstäbe 32 entlang des langsamer bewegten Kunststoff-Schlauches 3, diesen zwischen sich einklemmend, bewegt werden. Die Fig. 3 zeigt, daß es dabei möglich ist, ein "oberes" Abstreifwegstück 10a einzustellen, das kurz unterhalb derjenigen Stellung endet, welche die Quersiegel-Backen 4 während der Erzeugung der Quersiegelnaht einnehmen. Ein "unteres" Abstreifwegstück 10b dagegen beginnt an dieser Stelle und erstreckt sich in Richtung des Richtungspfeiles 31. Der gesamte Abstreifweg 10 wie auch die Abstreifwegstücke 10a und 10b können innerhalb von vorrichtungsfesten Grenzwerten verändert werden.Using the display 51, it is possible to modify and divide a stripping path 10. The stripping path 10 means the distance within the sealing area 1 that is required for complete removal of packaging material 30 from the area of the plastic tube 3 intended for the sealing and within which the stripping bars 32 along the slower moving plastic tube 3, this jammed between them, to be moved. Fig. 3 shows that it is possible to set an "upper" stripping path 10a, which ends just below the position which the cross seal jaws 4 assume during the production of the cross seal seam. A "lower" stripping path 10b, however, begins at this point and extends in the direction of the directional arrow 31. The entire stripping path 10 as well as the stripping path pieces 10a and 10b can be changed within limit values fixed to the device.

Ein Antrieb 6, der im wesentlichen aus dem Servomotor 61 und dem Getriebe 62 besteht, treibt die Antriebsrollen 22. Er ist gemäß Fig. 4 mit einem Riementrieb 64 versehen, wobei zweite Spannrollen 63 dafür sorgen, daß ein ausreichender Umschlingungswinkel an den Antriebsrollen 22 deren schlupffreien, synchronen Antrieb gewährleistet.A drive 6, which consists essentially of the servo motor 61 and the gear 62, drives the drive rollers 22. It is provided with a belt drive 64 according to FIG. 4, second tensioning rollers 63 ensuring that a sufficient wrap angle on the drive rollers 22 is provided slip-free, synchronous drive guaranteed.

Je ein an der Quersiegel-Vorrichtung ortsfestes Anlagestück 7 ist dem gezogenen Trumm des jeweiligen Antriebsbandes 2 unterlegt, so daß dieses nicht ausweichen kann, wenn die Abstreifstäbe 23 an dem Kunststoff-Schlauch 3 wirksam sind.One fixed piece on the transverse sealing device 7 is underlaid on the drawn run of the respective drive belt 2, so that it cannot deflect when the stripping rods 23 on the plastic hose 3 are effective.

Aufstellung der BezugszeichenList of reference numbers

11
SiegelbereichSealing area
1010th
AbstreifwegWiping path
10a,10b10a, 10b
AbstreifwegstückWiping section
22nd
AntriebsbandDrive belt
2121
SpannrolleIdler pulley
2222
AntriebsrolleDrive roller
2323
AbstreifstabScraper
33rd
Kunststoff-SchlauchPlastic hose
3030th
VerpackungsgutPackaged goods
3131
RichtungspfeilDirectional arrow
3232
Schlauchbeutel-VerpackungTubular bag packaging
44th
Quersiegel-BackeCross seal jaw
4141
SiegelflächeSealing surface
55
LagereglerPosition controller
5151
DisplayDisplay
5252
Näherungsschalterproximity switch
5353
ServoverstärkerServo amplifier
66
Antriebdrive
6161
ServomotorServo motor
6262
Getriebetransmission
6363
SpannrolleIdler pulley
6464
RiementriebBelt drive
77
AnlagestückAttachment piece

Claims (16)

Quersiegel-Vorrichtung für eine Schlauchbeutel-Verpackungsmaschine mit mindestens einem Paar Quersiegel-Backen, die an einen ggf. in Richtung seiner Längsachse bewegten Kunststoff-Schlauch anlegbar sind, diesen dabei quer zu seiner Längsachse durch jeweils eine Quersiegelnaht in einzelne Schlauchbeutel-Verpackungen teilend, und mit mindestens einem Paar den Quersiegel-Backen vorlaufender, symmetrisch zueinander und parallel zu der Quersiegelnaht angeordneter und gegeneinander und entlang des Siegelbereiches symmetrisch bewegter Abstreifstäbe, die innerhalb und entlang mindestens eines Teiles des Siegelbereiches, den Kunststoff-Schlauch zwischen sich einklemmend, zumindest einen für die Quersiegelnaht vorgesehenen Bereich des Kunststoff-Schlauches so überstreichen, daß das Verpackungsgut aus diesem Bereich in die zu verschließende Schlauchbeutel-Verpackung abgestreift wird,
dadurch gekennzeichnet, daß (a) beiderseits und symmetrisch zu dem Siegelbereich (1) je ein endloses, flexibles Antriebsband (2) vorgesehen ist, (b) die Abstreifstäbe (23) paarweise an den beiden Antriebsbändern (2) befestigt sind, (c) die Antriebsbänder (2) von einem gemeinsamen Antrieb (6) über je eine Antriebsrolle (22) synchron angetrieben werden und (d) für diesen Antrieb (6) eine Steuereinrichtung vorgesehen ist, welche die Bewegung der Abstreifstäbe (23) unabhängig von den Bewegungen des Kunststoff-Schlauches (3) und der Quersiegel-Backen (4) steuert. Cross-sealing device for a tubular bag packaging machine with at least one pair of cross-sealing jaws, which can be placed on a plastic tube that may be moved in the direction of its longitudinal axis, dividing this crosswise to its longitudinal axis by a transverse sealing seam into individual tubular bag packages, and with at least one pair of scraper bars leading the cross seal jaws, arranged symmetrically to one another and parallel to the cross seal seam and symmetrically moved with respect to one another and along the sealing area, which clamps the plastic tube between them, within and along at least part of the sealing area, at least one for the Paint over the area of the plastic tube provided for the transverse sealing seam so that the packaged goods are stripped from this area into the tubular bag packaging to be closed,
characterized in that (a) an endless, flexible drive belt (2) is provided on both sides and symmetrically to the sealing area (1), (b) the scraper bars (23) are attached in pairs to the two drive belts (2), (c) the drive belts (2) are driven synchronously by a common drive (6) via one drive roller (22) each and (d) a control device is provided for this drive (6), which controls the movement of the stripping bars (23) independently of the movements of the plastic tube (3) and the cross seal jaws (4). Quersiegel-Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Antriebsbänder (2) jeweils von einem endlos geschlossenen Zahnriemen gebildet werden.Cross seal device according to claim 1, characterized in that the drive belts (2) are each formed by an endlessly closed toothed belt. Quersiegel-Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die vorzugsweise stirnverzahnte Innenseite des Antriebsbandes (2) über jeweils eine der Antriebsrollen (22) und mehrere erste Spannrollen (21) geführt ist.Cross seal device according to claim 1 or 2, characterized in that the preferably spur-toothed inside of the drive belt (2) is guided over in each case one of the drive rollers (22) and a plurality of first tensioning rollers (21). Quersiegel-Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Antriebsrolle (22) am Ende des Siegelbereiches (1) vorgesehen ist.Cross seal device according to one of claims 1 to 3, characterized in that the drive roller (22) is provided at the end of the sealing area (1). Quersiegel-Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Antriebsmoment in die Antriebsrollen (22) mittels eines gemeinsamen, mit dem Antrieb (6) verbundenen Riementriebes (64) eingeleitet wird.Cross seal device according to one of claims 1 to 4, characterized in that the drive torque is introduced into the drive rollers (22) by means of a common belt drive (64) connected to the drive (6). Quersiegel-Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Schlupf des Riementriebes (64) an den Antriebsrollen (22) durch mindestens eine zweite Spannrolle (63) minimiert wird.Cross seal device according to claim 5, characterized in that the slippage of the belt drive (64) on the drive rollers (22) is minimized by at least one second tensioning roller (63). Quersiegel-Vorrichtung nach Anspruch 5 und 6, dadurch gekennzeichnet, daß die zweite(n) Spannrolle(n) (63) so angeordnet ist (sind), daß der Umschlingungswinkel an den beiden Antriebsrollen (22) nahezu gleich ist.Cross seal device according to claims 5 and 6, characterized in that the second tensioning roller (s) (63) are arranged in this way is (are) that the wrap angle on the two drive rollers (22) is almost the same. Quersiegel-Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß für den Antrieb (6) ein Servomotor (61) vorgesehen ist, der von einem die zeitabhängige Position der Abstreifstäbe (23) regelnden Lageregler (5) drehzahlgesteuert wird.Cross seal device according to one of Claims 1 to 7, characterized in that a servo motor (61) is provided for the drive (6) and is speed-controlled by a position controller (5) regulating the time-dependent position of the stripping bars (23). Quersiegel-Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Position der Abstreifstäbe (23) von einem Näherungsschalter (52) gemessen wird.Cross seal device according to claim 8, characterized in that the position of the stripping bars (23) is measured by a proximity switch (52). Quersiegel-Vorrichtung nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß der Lageregler (5) den Servomotor (61) über einen Servoverstärker (53) schaltet.Cross seal device according to claim 8 or 9, characterized in that the position controller (5) switches the servo motor (61) via a servo amplifier (53). Quersiegel-Vorrichtung nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, daß der Lageregler (5) einen inkrementalen Geber für die Drehzahlsteuerung des Servomotors (61) aufweist.Cross seal device according to one of claims 8 to 10, characterized in that the position controller (5) has an incremental encoder for the speed control of the servo motor (61). Quersiegel-Vorrichtung nach einem der Ansprüche 8 bis 11, dadurch gekennzeichnet, daß an dem Lageregler (5) ein Display (51) als Sollwerteinstellung zur Festlegung des von den den Kunststoff-Schlauch (3) klemmenden, das Verpackungsgut (30) in die Schlauchbeutel-Verpackung (32) abstreifenden Abstreifstäben (23) innerhalb des Siegelbereiches (1) zurückgelegten Abstreifweges (10) vorgesehen ist.Cross seal device according to one of claims 8 to 11, characterized in that on the position controller (5) a display (51) as a setpoint setting for fixing the packaging material (30) which clamps the plastic tube (3) into the tubular bag -Packaging (32) stripping strips (23) within the sealing area (1) covered stripping path (10) is provided. Quersiegel-Vorrichtung nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß der Siegelbereich (1) senkrecht angeordnet ist.Cross seal device according to one of claims 1 to 12, characterized in that the sealing area (1) is arranged vertically. Quersiegel-Vorrichtung nach Anspruch 12 und 13, dadurch gekennzeichnet, daß ein oberes Abstreifwegstück (10a) einstellbar ist, das kurz unterhalb der an der Quersiegelnaht anliegenden Quersiegel-Backen (4) endet.Cross seal device according to claims 12 and 13, characterized in that an upper stripping path piece (10a) is adjustable, which ends shortly below the cross seal jaws (4) resting on the cross seal seam. Quersiegel-Vorrichtung nach Anspruch 12 und 13, dadurch gekennzeichnet, daß ein unteres Abstreifwegstück (10b) einstellbar ist, das kurz unterhalb der an der Quersiegelnaht anliegenden Quersiegel-Backen (4) beginnt.Cross seal device according to claims 12 and 13, characterized in that a lower stripping path piece (10b) is adjustable, which begins just below the cross seal jaws (4) resting on the cross seal seam. Quersiegel-Vorrichtung nach einem der Ansprüche 1 bis 15, dadurch gekennzeichnet, daß innerhalb des Siegelbereiches (1) das jeweilige Antriebsband (2) zumindest partiell auf seiner der Schlauchbeutel-Verpackung (32) abgewandten Seite jeweils von einem ortsfesten Anlagestück (7) so hinterfangen ist, daß es seine Lage auch dann beibehält, wenn die an dem Kunststoff-Schlauch (3) anliegenden Abstreifstäbe (23) eine Reaktionskraft auf das Antriebsband (2) ausüben.Cross-sealing device according to one of claims 1 to 15, characterized in that within the sealing area (1) the respective drive belt (2) at least partially traps at least partially on its side facing away from the tubular bag packaging (32) from a stationary contact piece (7) is that it maintains its position even when the stripping rods (23) abutting the plastic hose (3) exert a reaction force on the drive belt (2).
EP95105472A 1994-04-13 1995-04-11 Apparatus for transversal sealing in a packaging machine for tubular foils Expired - Lifetime EP0677443B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4412577A DE4412577A1 (en) 1994-04-13 1994-04-13 Cross seal device for a tubular bag packaging machine
DE4412577 1994-04-13

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EP0677443B1 EP0677443B1 (en) 1997-10-22

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GB2314064A (en) * 1995-04-03 1997-12-17 Molins Plc Packaging machine with a stripping device
DE19719338C1 (en) * 1997-05-07 1998-08-06 Rovema Gmbh Transverse sealing mechanism for bags formed from hose
EP0897868A1 (en) * 1997-08-16 1999-02-24 Rovema Verpackungsmaschinen GmbH Apparatus for transversally sealing a tubular web

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US10358244B2 (en) 2015-10-26 2019-07-23 Triangle Package Machinery Co. Rotatable sealing jaw assembly for a form, fill and seal machine
DE102017109892A1 (en) 2017-05-09 2018-11-15 Metzner Maschinenbau Gmbh Device for processing cables

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EP0897868A1 (en) * 1997-08-16 1999-02-24 Rovema Verpackungsmaschinen GmbH Apparatus for transversally sealing a tubular web

Also Published As

Publication number Publication date
EP0677443B1 (en) 1997-10-22
DE59500827D1 (en) 1997-11-27
DE4412577A1 (en) 1995-10-19
US5575137A (en) 1996-11-19

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