DE3205755C1 - Device for separating and welding a plastic film web - Google Patents

Device for separating and welding a plastic film web

Info

Publication number
DE3205755C1
DE3205755C1 DE19823205755 DE3205755A DE3205755C1 DE 3205755 C1 DE3205755 C1 DE 3205755C1 DE 19823205755 DE19823205755 DE 19823205755 DE 3205755 A DE3205755 A DE 3205755A DE 3205755 C1 DE3205755 C1 DE 3205755C1
Authority
DE
Germany
Prior art keywords
knife
protective film
bar
film strip
counter
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
DE19823205755
Other languages
German (de)
Inventor
Hans 5216 Niederkassel Lehmacher
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.)
M Lehmacher and Sohn GmbH Maschinenfabrik
Original Assignee
M Lehmacher and Sohn GmbH Maschinenfabrik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by M Lehmacher and Sohn GmbH Maschinenfabrik filed Critical M Lehmacher and Sohn GmbH Maschinenfabrik
Priority to DE19823205755 priority Critical patent/DE3205755C1/en
Application granted granted Critical
Publication of DE3205755C1 publication Critical patent/DE3205755C1/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B29C66/0044—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool
    • B29C66/00441—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool movable, e.g. mounted on reels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/745—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

Device for separating and welding a plastic film web (1) having a cutter bar (2) and counter bar (3) which are movable relative to one another in the cutting and welding cycle. Protective film strips (8, 11) are guided over the knife (6) of the cutting bar (2) and over the counter bar (3), which has a knife-insertion groove (7). The protective film strip (11) guided over the counter bar (3) and the knife-insertion groove (7) is held at at least one side upstream or downstream of the counter bar (3) between clamping jaws (16, 17) which are fastened to a restoring spring arrangement (18). The clamping jaws (16, 17) can be moved against the effect of the restoring spring arrangement (18) during insertion of the knife (6) into the knife-insertion groove as a function of the protective film strip (11) pressed into the knife-insertion groove (7) by the knife and be moved back by the restoring spring arrangement (18) during the upwards movement of the knife (6). <IMAGE>

Description

Abspuleinrichtung 9, 10 geführt ist. Außerdem ist ein solcher Schutzfolienstreifen 11 über den Gegenbalken 3 und die Messereintauchnut 7 geführt. Er läuft ebenfalls zu zugeordneten Auf- bzw. Abspuleinrichtungen 12, in Die Schutzfolienstreifen 8, 11 sind durch Betätigung cer Auf- bzw. Abspuleinrichtungen 9, 10 bzw. 12, :3 verstellbar, so daß immer andere Abschnitte mit der Scliweißeinrichtung bzw. dem Messer 6 in Kontakt kommen. Die Schwciüeinrichtung besteht im Ausführungsbeispiel aus Schweißbalken 14, 15 vor und hinter dem Messer 6.Unwinding device 9, 10 is performed. In addition, there is such a protective film strip 11 guided over the counter bar 3 and the knife immersion groove 7. He's also running to assigned winding or unwinding devices 12, in the protective film strips 8, 11 are adjustable by actuating the winding or unwinding devices 9, 10 or 12,: 3, so that always other sections with the Welding device or the knife 6 come into contact. The Schwciüeinrichtung exists in the embodiment from sealing bars 14, 15 in front of and behind the knife 6.

Der über den Gegenbalken 3 und die Messereintauchnut 7 geführte Schutziolicnstreifen 11 ist im Ausführungsbeispiel an einer Seite an dem Gegenbalken 3 zwischen Klemmbacken 16, 17 gehalten. Die Klemmbacken 16, 17 sind an einer Rückstellfederanordnung 18 befestigt. Die Klemmbacken 16, 17 sind beim Eintauehen des Messers 6 in die Messereintauchnut 7 nach Maßgabe des vom Messer 6 in die Messereintauchnut 7 eingedrückten Schutzfolienstreifens 11 gegen die Rückstellfederanordnung 18 bewegbar. Diese Bewegung der Klemmbacken 16, 17 ist in der Figur durch Doppelpfeil dargestellt worden. Im übrigen zeigt die Figur den eingetauchten Zustand. Dabei ist der Schutzfolienstreifen 11 durch die Rückstellfederanordnung 18 gespannt, und zwar so, daß er als nachgiebiges Schneidwiderlager wirksam ist, so daß ein Schneidwiderlager in Form einer Metalleiste entfallen kann. Die Spannkraft richtet sich nach der Mechanik des Schneidvorganges. Wird mit einem heißen oder auch nur erwärmten Messer 6 gearbeitet, so ist eine hohe Spannkraft im allgemeinen nicht erforderlich. Jedenfalls taucht das Messer 6 mit dem Schutzfolienstreifen nur etwa 2 mm in die Messereintauchnut 7 ein. Das reicht für den Schneidvorgang aus und verhindert in Kombination mit den vorbeschriebenen Maßnahmen sicher, daß Kunststoff-Folienbahnreste sich beim Schneidvorgang an der Kontaktstelle mit dem Messer 6 an dem Schutzfolienstreifen 11 festsetzen und dort ansammeln. Die Rückstellfederkraft der Rückstellfederanordnung 18 ist durch Veränderung der freien Federlänge mittels der Federleistenhalterung als Einrichtung 19 einstellbar. The protective strip guided over the counter bar 3 and the knife immersion groove 7 In the exemplary embodiment, 11 is on one side of the counter beam 3 between clamping jaws 16, 17 held. The clamping jaws 16, 17 are on a return spring arrangement 18 attached. The clamping jaws 16, 17 are when the knife 6 is thawed into the knife immersion groove 7 in accordance with the protective film strip pressed into the knife immersion groove 7 by the knife 6 11 can be moved against the return spring arrangement 18. This movement of the jaws 16, 17 has been shown in the figure by double arrows. Incidentally, shows the Figure the submerged state. The protective film strip 11 is through the Return spring assembly 18 tensioned, in such a way that it acts as a resilient cutting abutment is effective, so that a cutting abutment in the form of a metal bar can be omitted. The clamping force depends on the mechanics of the cutting process. Will come with a hot or even just heated knife 6 is worked, so is a high clamping force generally not required. In any case, the knife 6 dips with the protective film strip only about 2 mm into the knife immersion groove 7. That is enough for the cutting process and, in combination with the measures described above, reliably prevents Remnants of plastic film web accumulate at the point of contact with the during the cutting process Fix the knife 6 on the protective film strip 11 and collect it there. The return spring force the return spring assembly 18 is by changing the free spring length by means the spring slat holder as a device 19 adjustable.

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Claims (3)

Patentansprüche: 1. Vorrichtung zum Trennen und Schweißen einer Kunststoff-Folienbahn, mit Messerbalken und Gegenbalken, die im Schneid- und Schweißtakt relativ zueinander bewegbar sind, wobei der Messerbalken einen in eine Messerhalteraufnahme eingesetzten Messerhalter mit zum Gegenbalken weisendem Messer und der Gegenbalken eine Messereintauchnut aufweisen, wobei über dem Messerbalken einerseits sowie über dem Gegenbalken andererseits jeweils ein Schutzfolienstreifen angeordnet ist, welcher von einer Abspuleinrichtung zu einer Aufspuleinrichtung geführt und durch diese verstellbar fixiert ist, dadurch gekennzeichnet, daß der über den Gegenbalken (3) mit der Messereintauchnut (7) geführte Schutzfolienstreifen (11) an zumindest einer Seite vor oder hinter dem Gegenbalken (3) zwischen Klemmbacken (16, 17) gehalten ist, die an einer Rückstellfederanordnung (18) befestigt sind, und daß die Klemmbacken (16, 17) beim Eintauchen des Messers (6) in die Messereintauchnut (7) nach Maßgabe des vom Messer (6) in die Messereintauchnut (7) eingedrückten Schutzfolienstreifens (11) durch diesen gegen die Wirkung der Rückstellfederanordnung (18) bewegbar sowie bei der Aufwärtsbewegung des Messers (6) durch die Rückstellfederanordnung (18) zurückbewegbar sind. Claims: 1. Device for cutting and welding a plastic film web, with cutter bar and counter bar, which are in the cutting and welding cycle relative to each other are movable, the knife bar being inserted into a knife holder receptacle Knife holder with knife pointing towards the counter bar and the counter bar a knife immersion groove have, on the one hand above the cutter bar and on the other hand above the counter bar in each case a protective film strip is arranged, which is from an unwinding device is guided to a winding device and is adjustably fixed by this, thereby characterized in that the guided over the counter bar (3) with the knife immersion groove (7) Protective film strips (11) on at least one side in front of or behind the counter bar (3) is held between clamping jaws (16, 17) attached to a return spring arrangement (18) are attached, and that the clamping jaws (16, 17) when the knife is immersed (6) in the knife immersion groove (7) in accordance with that of the knife (6) in the knife immersion groove (7) impressed protective film strip (11) by this against the effect of the Return spring arrangement (18) movable as well as during the upward movement of the knife (6) can be moved back by the return spring arrangement (18). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Messer (6) mit dem Schutzfolienstreifen (11) etwa 2 mm in die Messereintauchnut (7) eintaucht. 2. Apparatus according to claim 1, characterized in that the knife (6) with the protective film strip (11) dips about 2 mm into the knife immersion groove (7). 3. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Rückstellfederanordnung (18) mit einer Einrichtung (19) zur Einstellung der Rückstellfederkraft versehen ist. 3. Device according to one of claims 1 or 2, characterized in that that the return spring arrangement (18) with a device (19) for adjustment the return spring force is provided. Die Erfindung bezieht sich auf eine Vorrichtung zum Trennen und Schweißen einer Kunststoff-Folienbahn, mit Messerbalken und Gegenbalken, die im Schneid-und Schweißtakt relativ zueinander bewegbar sind, wobei der Messerbalken einen in eine Messerhalteraufnahme eingesetzten Messerhalter mit zum Gegenbalken weisendem Messer und der Gegenbalken eine Messereintauchnut aufweisen, wobei über dem Messerbalken einerseits sowie über dem Gegenbalken andererseits jeweils ein Schutzfolienstreifen angeordnet ist, welcher von einer Abspuleinrichtung zu einer Aufspuleinrichtung geführt und durch diese verstellbar fixiert ist. The invention relates to a device for cutting and welding a plastic film web, with cutter bar and counter bar, which are in the cutting and Welding cycle are movable relative to each other, the cutter bar in a Knife holder holder inserted knife holder with knife pointing towards the counter bar and the counter bar have a knife immersion groove, wherein above the knife bar on the one hand and on the other hand a protective film strip over the counter bar is arranged, which from an unwinding device to a winding device is guided and fixed by this adjustable. Bei einer bekannten derartigen Vorrichtung (FR-PS 1421817, GB-PS 1035031) befindet sich in der Messereintauchnut ein Schweißwiderlager, welches gegen die Wirkung von Rückstellfedern auf- und niederbewegbar ist. Beim Schneidvorgang drückt das Messer den Schutzfolienstreifen unter Zwischenschaltung der zu schneidenden Kunststoff-Folienbahn auf das Schneidwiderlager. Der Eintauchvorgang ist verhältnismäßig tief, die Tiefe beträgt im allgemeinen 5 mm oder mehr. Der Schutzfolienstreifen ist elastisch dehnbar und besitzt eine solche Länge, daß er dieser Bewegung des Messers folgen kann. Man beobachtet, daß sich an dem Schutzfolienstreifen Schneidreste der Kunststoff-Folienbahn absetzen und anhäufen. Häufige Reinigung, Wartung und Pflege des Schutzfolienstreifens sind daher erforderlich. Das erhöht die Stillstanclszeiten der Vorrichtung und der zugeordneten Maschine insgesamt und ist daher in erheblichem Maße störend und kostenaufwendig. In a known device of this type (FR-PS 1421817, GB-PS 1035031) there is a welding abutment in the knife immersion groove, which against the action of return springs can be moved up and down. During the cutting process the knife presses the protective film strip with the interposition of the one to be cut Plastic film web on the cutting abutment. The immersion process is proportionate deep, the depth is generally 5 mm or more. The protective film strip is elastically stretchable and has such a length that it can accommodate this movement of the Messers can follow. It is observed that there are cutting residues on the protective film strip the plastic film strip and pile up. Frequent cleaning, maintenance and Care of the protective film strip is therefore necessary. This increases the silence times the device and the associated machine as a whole and is therefore in considerable Dimensions annoying and expensive. Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung so weiter auszubilden, daß beim Schneidvorgang ein störendes Absetzen von Kunststoff-Folienbahnresten an dem Schutzfolienstreifen, der über den Gegenbalken mit der Messereintauchnut geführt ist, nicht mehr stattfindet. The invention is based on the object of a generic device to further train that during the cutting process a disruptive deposition of plastic film web residues on the protective film strip over the counter bar with the knife immersion groove is no longer taking place. Zur Lösung dieser Aufgabe lehrt die Erfindung, daß der über den Gegenbalken mit der Messereintauchnut geführte Schutzfolienstreifen an zumindest einer Seite vor oder hinter dem Gegenbalken zwischen Klemmbakken gehalten ist, die an einer Rückstellfederanordnung befestigt sind, und daß die Klemmbacken beim Eintauchen des Messers in die Messereintauchnut nach Maßgabe des vom Messer in die Messereintauchnut eingedrückten Schutzfolienstreifens durch diesen gegen die Wirkung der Rückstellfederanordnung bewegbar sowie bei der Aufwärtsbewegung des Messers durch die Rückstellfederanordnung zurückbewegbar sind. To solve this problem, the invention teaches that the counter bar Protective film strips guided with the knife immersion groove on at least one side is held in front of or behind the counter beam between clamping jaws, which on a Return spring assembly are attached, and that the jaws when immersed of the knife in the knife immersion groove in accordance with that of the knife in the knife immersion groove impressed protective film strip through this against the action of the return spring arrangement movable as well as during the upward movement of the knife by the return spring arrangement are movable back. Auf diese Weise läßt sich bei der erfindungsgemäßen Vorrichtung die Rückstellkraft der Rückstellfederanordnung stets so einrichten, daß ein Absetzen von Kunststoff-Folienbahnresten an dem Schutzfolienstreifen beim Schneidvorgang nicht mehr stattfindet. In this way, in the device according to the invention, the Always set up the restoring force of the restoring spring arrangement so that it settles of plastic film web residues on the protective film strip during the cutting process no longer takes place. Die Fixierung des Schutzfolienstreifens, der über die Messereintauchnut geführt ist, erfolgt durch Auf- und Abspuleinrichtungen, so daß die Rückstellanordnung in der beschriebenen Art und Weise arbeiten kann. The fixation of the protective film strip over the knife immersion groove is performed, takes place by winding and unwinding devices, so that the reset arrangement can work in the manner described. Trotzdem ist der Schutzfolienstreifen durch Betätigung der Auf- und Abspuleinrichtungen verstellbar. um im Laufe der Zeit unterschiedliche Abschnitte des Schutzfolienstreifens in der beschriebenen Weise wirksam werden zu lassen.Nevertheless, the protective film strip is by pressing the open and Unwinding devices adjustable. around different sections over time of the protective film strip to take effect in the manner described. Nach einer bevorzugten Ausführungsform der Erfindung taucht das Messer mit dem Schutzfolienstreifen etwa 2 mm in die Messereintauchnut ein. Die Rückstellfederanordnung kann mit einer Einrichtung zur Einstellung der Rückstellkraft, z. B. durch Einstellung der freien Federlänge einer Federleiste, versehen sein. According to a preferred embodiment of the invention, the knife plunges with the protective film strip about 2 mm into the knife immersion groove. The return spring assembly can with a device for adjusting the restoring force, z. B. through recruitment the free spring length of a socket strip. Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels ausführlicher erläutert. In the following, the invention is illustrated by means of one in the drawing Embodiment explained in more detail. Die einzige Figur zeigt einen Vertikalschnitt durch die Vorrichtung. The single figure shows a vertical section through the device. Die Vorrichtung dient zum Trennen und Schweißen einer Kunststoff-Folienbahn 1. Zum grundsätzlichen Aufbau gehören ein Messerbalken 2 und ein Gegenbalken 3. Beide sind im Schneid- und Schweißtakt relativ zueinander bewegbar. Im Ausführungsbeispiel mag der Gegenbalken 3 feststehen, während der Messerbalken 2 in Richtung des eingezeichneten vertikalen Pfeiles auf-und niederbewegbar ist. Der Messerbalken 2 besitzt einen in eine Messerhalteraufnahme 4 eingesetzten Messerhalter 5 mit zum Gegenbalken 3 weisendem Messer 6. Der Gegenbalken 3 ist mit einer Messerein- -tauchnut 7 versehen. Zwischen Messerhalteraufnahme 4 und Messerhalter 5 ist umschlingend ein Schutzfolienstreifen 8 geführt, der andererseits zu einer Auf- bzw. The device is used to cut and weld a plastic film web 1. The basic structure includes a cutter bar 2 and a counter bar 3. Both can be moved relative to one another in the cutting and welding cycle. In the exemplary embodiment the counter bar 3 may be stationary, while the cutter bar 2 in the direction of the drawn vertical arrow can be moved up and down. The cutter bar 2 has a Knife holder 5 inserted into a knife holder receptacle 4 with the counter bar 3 pointing knife 6. The counter bar 3 is provided with a knife immersion groove 7. A protective film strip is wrapped between the knife holder receptacle 4 and knife holder 5 8, which, on the other hand, leads to an up or down
DE19823205755 1982-02-18 1982-02-18 Device for separating and welding a plastic film web Expired DE3205755C1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000026010A1 (en) * 1998-10-16 2000-05-11 Roll-O-Matic A/S A welding string for forming transverse welding seams in a sheet of film

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1421817A (en) * 1964-01-14 1965-12-17 Cutting and welding device for tubular elements or folded sheets of thermoplastic material, intended for the manufacture of pouches, bags or similar packaging
GB1035031A (en) * 1962-02-12 1966-07-06 Lehmacher Michael Device for welding and/or cutting foils of thermoplastic synthetic substances

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1035031A (en) * 1962-02-12 1966-07-06 Lehmacher Michael Device for welding and/or cutting foils of thermoplastic synthetic substances
FR1421817A (en) * 1964-01-14 1965-12-17 Cutting and welding device for tubular elements or folded sheets of thermoplastic material, intended for the manufacture of pouches, bags or similar packaging

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000026010A1 (en) * 1998-10-16 2000-05-11 Roll-O-Matic A/S A welding string for forming transverse welding seams in a sheet of film

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