EP0064773B1 - Apparatus for making and depositing groups of plastic bags - Google Patents

Apparatus for making and depositing groups of plastic bags Download PDF

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Publication number
EP0064773B1
EP0064773B1 EP82104205A EP82104205A EP0064773B1 EP 0064773 B1 EP0064773 B1 EP 0064773B1 EP 82104205 A EP82104205 A EP 82104205A EP 82104205 A EP82104205 A EP 82104205A EP 0064773 B1 EP0064773 B1 EP 0064773B1
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EP
European Patent Office
Prior art keywords
bags
bag
suction
pressure
tubular film
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
EP82104205A
Other languages
German (de)
French (fr)
Other versions
EP0064773A1 (en
Inventor
Fritz Achelpohl
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.)
Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Filing date
Publication date
Priority claimed from DE3145869A external-priority patent/DE3145869C2/en
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP0064773A1 publication Critical patent/EP0064773A1/en
Application granted granted Critical
Publication of EP0064773B1 publication Critical patent/EP0064773B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H33/00—Forming counted batches in delivery pile or stream of articles
    • B65H33/12—Forming counted batches in delivery pile or stream of articles by creating gaps in the stream
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/66—Advancing articles in overlapping streams
    • B65H29/6609—Advancing articles in overlapping streams forming an overlapping stream
    • B65H29/6618—Advancing articles in overlapping streams forming an overlapping stream upon transfer from a first conveyor to a second conveyor advancing at slower speed
    • B65H29/6627—Advancing articles in overlapping streams forming an overlapping stream upon transfer from a first conveyor to a second conveyor advancing at slower speed in combination with auxiliary means for overlapping articles
    • 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
    • B31B2155/00—Flexible containers made from webs
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/003—Flexible containers made from webs starting from tubular webs
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
    • Y10T156/13—Severing followed by associating with part from same source

Definitions

  • the invention relates to a device for producing plastic bags from an intermittently advancing flat tubular film web and for depositing them in groups that overlap with one another on an intermittently drivable conveyor belt.
  • the holding device In a device known from GB-A-2 026 988 of the type mentioned in the preamble of claim 1, the holding device consists of two comb-like rows of needles which reach through elongated holes in a support plate bridging the gap between the cutting device and the conveyor belt and to below from this one. are attached with drives provided drives. which alternately move a row from their needle position projecting above the support plate into a position advanced against the conveyor belt. Before or at the start of the feed movement, the other row in the advanced position is withdrawn from the stack under the support plate and moved into the needle position during the advance stroke.
  • the belt drive is switched on, so that the next bag is needled first onto the row of needles moved into its needling position and covers the stack that has been pushed off in a scale-like manner.
  • the blown air flow passing over the stack of bags cannot disorder the stack. because the bags are either needled onto a row of needles that hold them or the stacks are covered in a scaly manner by the bag or bags in the following stack.
  • the object of the invention is therefore to provide a device of the type specified at the outset, with which imperforate bags can be produced.
  • the shingled bags lying one above the other are at a distance from one another which corresponds approximately to the distance from the cross-cutting device to the first row of suction holes.
  • the respective end of the tubular film web is carried forward by the blown air flow to below the lowerable pressure roller. If the tubular film web is now pressed down by the cutting knife or another part of the cutting device, the belt drive is switched on while simultaneously lowering the pressure roller, so that the opening edge of the penultimate bag sucked in from the rear suction hole row is pulled off and the last bag formed is pulled over the suction hole row until whose opening edge just about covers it.
  • the device is controlled by a control device such that after a group of bags of a predetermined number of bags lying on top of one another has been deposited, the belt drive is switched on with the pressure roller lowered until the opening edge of the last bag of this group lies above the first row of suction holes and is sucked in by the latter. The following bag is sucked in with its opening edge again from the rear row of suction holes, so that larger scale distances are formed to separate the groups.
  • the individual groups of plastic bags can be removed and packed by hand or by machine from the conveyor belt. If the groups of plastic bags are removed by hand, the larger distance between the scales is used. to make it easier for the packer to remove the bags from the conveyor belt and to fill boxes, for example, with the same number of bags or sacks.
  • a device for transferring sheets separated from a web and continuously conveyed in scale formation which is provided with a switch for the removal of determined defective sheets.
  • the individual sheets run into a slower conveying conveyor via a brake plate spaced apart from one another with two rows of suction holes. which transports the sheets lying on top of one another in a shingled manner to a stacking station.
  • the first row of suction holes on the brake plate which is supplied with suction air in time with the passage of the sheets, brakes the sheets fed at a higher speed, while the second row of suction air also serves to hold back the sheet that has already been braked. if an interruption occurs in the sheet feeder due to the removal of a faulty sheet.
  • a device for transferring bags or sacks after their manufacture into a scale formation in which a lifting and lowering pressure roller interacts with the last bag deposited and intermittently conveys it with the bags already underneath .
  • Rear upper and rear lower conveyor belt rollers 2, 3 are mounted between the side frame walls 1 of the machine frame.
  • the divided conveyor belts 5 wm run over these conveyor belt rollers 2, 3 and front conveyor belt rollers 4, which are also mounted between the side frame walls 1.
  • the cross-welding and cross-cutting device 6 is arranged in front of the conveyor belt 5.
  • This consists of a pair of preferred rollers 7 which intermittently pulls the tubular film web 8, which is pulled off from a supply roll, intermittently by one bag or sack length.
  • Blown air nozzles 9 are arranged on both sides of the tubular film web 9 in annular grooves of the preferred rollers 7, which carry the respective front end of the tubular film web 8 stretched.
  • a cross welding device 10 and a cross cutting device 11 are arranged behind the feed rollers 7 in the feed direction. So far, the device is of a known type.
  • a suction box 32 is arranged between the cross cutting device 11 and the rear deflection roller 2.
  • This suction box 32 is connected in a manner not shown to a suction air source and has two transverse rows of suction openings 33, 34 at a distance from one another.
  • the spacing of these rows of suction openings 33, 34 from one another is as large as the spacing X of the groups of bags or sacks that are overlapping on the conveyor belt 5.
  • the distance between the rear row of suction holes 33 and the transverse cutting device 11 corresponds to the simple scale distance Z of the individual bags or sacks within each group.
  • a pressure roller 35 is arranged in the end region of the front ends of the tubular film web which are freely brought forward and is actuated by a pressure medium-piston-cylinder unit 36, the cylinder of which is mounted on the frame.
  • a counter-pressure roller 37 is provided under the conveyor belt 5, against which the lowered pressure roller presses the sacks or bags lying on the conveyor belt, so that they are held against one another and against the conveyor belt.
  • the pressure roller 35 and the counter-pressure roller 37 are designed to be displaceable in and against the conveying direction.
  • the pressure roller 35 lowers onto the counter-pressure roller 37 as soon as a bag has been separated from the knife of the cross-cutting device 11 from the tubular film web 8 until the rear open end of this piece of bag or bag lies over the rear row of suction holes 33 of the suction box 32 lies and is sucked in by this. Then the pressure roller 35 lifts and the next piece of bag or bag is discharged by the blown air stream over the bag or bag piece held by the suction hole row 33.
  • a control device (not shown) is provided which repeats this process until a desired number of pieces of sack in a group has been deposited on the conveyor belt 5, one above the other. A larger scale spacing with dimension X is then formed by appropriate control.
  • the pressure roller 35 is pressed onto the counter-pressure roller 37 until the upper piece of bag has been drawn beyond the suction hole row 33 to the front suction hole region 34 and is held by the latter.
  • the subsequent piece of sack is then pressed by the pressure roller 35 onto the counter-pressure roller 37 only until its open end is above the rear suction hole row 33 and is held by it.
  • the blown air stream emerging from the blown air nozzles 9 is intermittently switched on and off in such a way that the blown air flow is switched off by the pressure roller 35 while the bag is preferred.
  • the blowing air is switched off and the separation welding process is initiated.
  • the last welded-off bag is then advanced by the pressure roller 35 by the amount determining the scale distance, until it has been drawn onto the rear suction hole row in the transport direction and is held by it. Only then is the following bag discharged through the blown air, so that no bag is unsupported whenever the blown air is switched on.
  • This type of control results in a scale in which groups of sacks or bags are separated by larger scale distances X.
  • the negative pressure for the suction air box 32 is such that, on the one hand, the blown air flow that discharges the bag pieces cannot lift the end of the bag from the suction hole row 33 or 34, and on the other hand the bag pieces are easily removed from the suction box 32 by lowering the pressure roller 35 can.
  • the frame of the conveyor belt 5 can be moved via rollers 25, so that it can be moved and replaced by the cross-welding and cutting device 6 in order to replace, for example, the suction box 32.
  • the suction box 32 is expediently provided with suction holes or suction slots over its entire length. This configuration ensures that the ends of the bags are always sucked and held by the suction holes or suction slots of the suction box, the desired scale spacing being formed solely by the particular preference given by the pressure roller.
  • the use of such a suction box also makes the intermittent switching on and off of the suction air for carrying the respective end of the tube superfluous, because each newly formed bag is sucked into its rear region as soon as the welding bar or the cutting knife is lowered and is thereby held.
  • the suction power is to be selected so that the rear ends of the bags are adequately held on the one hand, but on the other hand the bags can be easily removed from the suction box by the pressure roller.

Description

Die Erfindung betrifft eine Vorrichtung zum Herstellen von Kunststoffbeuteln aus einer intermittierend voranbewegten flachliegenden Schlauchfolienbahn und zu deren Ablegen in einander geschuppt überdeckenden Gruppen auf ein intermittierend antreibbares Förderband nach dem Oberbegriff des Anspruchs 1.The invention relates to a device for producing plastic bags from an intermittently advancing flat tubular film web and for depositing them in groups that overlap with one another on an intermittently drivable conveyor belt.

Bei einer aus GB-A-2 026 988 bekannten Vorrichtung der im Oberbegriff des Anspruchs 1 genannten Gattung besteht die Halteeinrichtung aus zwei einander kammartig durchsetzenden Reihen von Nadeln, die durch Langlöcher einer den Spalt zwischen der Schneideinrichtung und dem Förderband überbrückenden Auflageplatte greifen und an unterhalb von dieser befindlichen. mit Antrieben versehenen Trägern befestigt sind. die im Wechsel eine Reihe aus ihrer die Auflageplatte überragenden Aufnadelstellung in eine gegen das Förderband vorgeschobene Stellung bewegen. Vor oder bei Beginn der Vorschubbewegung wird die andere in der vorgeschobenen Stellung befindliche Reihe aus dem Stapel unter der Auflageplatte zurückgezogen und während des Vorschubtaktes in die Aufnadelstellung gefahren. Während der Vorschubbewegung der jeweiligen Nadelreihe ist der Bandantrieb eingeschaltet, so daß der nächstfolgende Beutel auf die in ihre Aufnadelstellung gefahrene Nadelreihe als erster aufgenadelt wird und den abgeschobenen Stapel schuppenartig überdeckt. Der über die Beutelstapel hinweggehende Blasluftstrom vermag die Stapel nicht in Unordnung zu bringen. weil die Beutel entweder auf eine diese festhaltende Nadelreihe aufgenadelt sind oder die Stapel durch den oder die Beutel des folgenden Stapels schuppenartig überdeckt sind.In a device known from GB-A-2 026 988 of the type mentioned in the preamble of claim 1, the holding device consists of two comb-like rows of needles which reach through elongated holes in a support plate bridging the gap between the cutting device and the conveyor belt and to below from this one. are attached with drives provided drives. which alternately move a row from their needle position projecting above the support plate into a position advanced against the conveyor belt. Before or at the start of the feed movement, the other row in the advanced position is withdrawn from the stack under the support plate and moved into the needle position during the advance stroke. During the advancing movement of the respective row of needles, the belt drive is switched on, so that the next bag is needled first onto the row of needles moved into its needling position and covers the stack that has been pushed off in a scale-like manner. The blown air flow passing over the stack of bags cannot disorder the stack. because the bags are either needled onto a row of needles that hold them or the stacks are covered in a scaly manner by the bag or bags in the following stack.

Abgesehen von dem vorrichtungsmäßigen Aufwand lassen sich mit der bekannten Maschine nur Beutel herstellen, deren Öffnungsränder durch die Haltenadeln perforiert sind.Apart from the complexity of the device, only known bags can be produced with the known machine, the opening edges of which are perforated by the holding needles.

Aufgabe der Erfindung ist es daher, eine Vorrichtung der eingangs angegebenen Art einfachen Aufbaus zu schaffen, mit der sich unperforierte Beutel herstellen lassen.The object of the invention is therefore to provide a device of the type specified at the outset, with which imperforate bags can be produced.

Erfindungsgemäß wird diese Aufgabe durch die in dem kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale gelöst.According to the invention, this object is achieved by the features specified in the characterizing part of claim 1.

Innerhalb der einzelnen abgelegten Gruppen weisen die geschuppt übereinander liegenden Beutel einen Abstand voneinander auf, der etwa dem Abstand der Querschneideinrichtung bis zu der ersten Sauglochreihe entspricht. Das jeweilige Ende der Schlauchfolienbahn wird von dem Blasluftstrom bis unter die absenkbare Druckwalze vorgetragen. Wird nun die Schlauchfolienbahn von dem Schneidmesser oder einem anderen Teil der Schneideinrichtung niedergedrückt, wird unter gleichzeitigem Absenken der Druckwalze der Bandantrieb eingeschaltet, so daß der von der hinteren Sauglochreihe angesaugte Öffnungsrand des vorletzten Beutels abgezogen und der zuletzt gebildete Beutel über die Sauglochreihe hinweggezogen wird, bis dessen Öffnungsrand diese etwa gerade noch abdeckt.Within the individual stored groups, the shingled bags lying one above the other are at a distance from one another which corresponds approximately to the distance from the cross-cutting device to the first row of suction holes. The respective end of the tubular film web is carried forward by the blown air flow to below the lowerable pressure roller. If the tubular film web is now pressed down by the cutting knife or another part of the cutting device, the belt drive is switched on while simultaneously lowering the pressure roller, so that the opening edge of the penultimate bag sucked in from the rear suction hole row is pulled off and the last bag formed is pulled over the suction hole row until whose opening edge just about covers it.

Die Vorrichtung wird von einer Steuereinrichtung derart gesteuert, daß nach Ablage einer geschuppt übereinander liegenden Gruppe von Beuteln vorbestimmter Anzahl der Bandantrieb bei abgesenkter Druckwalze so lange eingeschaltet ist, bis der Öffnungsrand des letzten Beutels dieser Gruppe über der ersten Sauglochreihe liegt und von dieser angesaugt wird. Der folgende Beutel wird mit seinem Öffnungsrand wieder von der hinteren Sauglochreihe angesaugt, so daß zur Trennung der Gruppen größere Schuppenabstände gebildet sind. Die einzelnen Gruppen von Kunststoffbeuteln können von dem Förderband von Hand oder maschinell abgenommen und verpackt werden. Erfolgt die Abnahme der Gruppen von Kunststoffbeuteln von Hand, dient der größere Schuppenabstand dazu. dem Packer die Abnahme der Säcke vom Förderband und das Füllen beispielsweise von Kartons mit stets der gleichen Anzahl von Beuteln oder Säcken zu erleichtern.The device is controlled by a control device such that after a group of bags of a predetermined number of bags lying on top of one another has been deposited, the belt drive is switched on with the pressure roller lowered until the opening edge of the last bag of this group lies above the first row of suction holes and is sucked in by the latter. The following bag is sucked in with its opening edge again from the rear row of suction holes, so that larger scale distances are formed to separate the groups. The individual groups of plastic bags can be removed and packed by hand or by machine from the conveyor belt. If the groups of plastic bags are removed by hand, the larger distance between the scales is used. to make it easier for the packer to remove the bags from the conveyor belt and to fill boxes, for example, with the same number of bags or sacks.

Aus der US-A-3 218 897 ist eine Vorrichtung zum Überführen von einer Bahn abgetrennten und kontinuierlich geförderten Bogen in Schuppenformation bekannt, die mit einer Weiche zum Ausscheiden ermittelter fehlerhafter Bogen versehen ist. Die einzelnen Bogen laufen dabei über eine im Abstand voneinander mit zwei Sauglochreihen versehene Bremsplatte in einen langsamer fördernden Förderer ein. der die auf diesem geschuppt übereinander liegenden Bogen zu einer Stapelstation transportiert. Die im Takt des Durchlaufs der Bogen mit Saugluft beaufschlagte erste Sauglochreihe der Bremsplatte bremst die mit höherer Geschwindigkeit zugeführten Bogen ab, während die zweite Saugluftreihe dazu dient, den bereits abgebremsten Bogen zusätzlich dann zurückzuhalten. wenn durch Ausscheiden eines fehlerhaften Bogens eine Unterbrechung in der Bogenzuführung eintritt.From US-A-3 218 897 a device for transferring sheets separated from a web and continuously conveyed in scale formation is known, which is provided with a switch for the removal of determined defective sheets. The individual sheets run into a slower conveying conveyor via a brake plate spaced apart from one another with two rows of suction holes. which transports the sheets lying on top of one another in a shingled manner to a stacking station. The first row of suction holes on the brake plate, which is supplied with suction air in time with the passage of the sheets, brakes the sheets fed at a higher speed, while the second row of suction air also serves to hold back the sheet that has already been braked. if an interruption occurs in the sheet feeder due to the removal of a faulty sheet.

Aus der FR-A-2 428 523 ist eine Vorrichtung zum Überführen von Beuteln oder Säcken nach deren Herstellung in eine Schuppenformation bekannt, bei der eine heb- und absenkbare Druckwalze mit dem jeweils zuletzt abgelegten Beutel zusammenwirkt und diesen mit den bereits darunterliegenden Beuteln intermittierend fördert.From FR-A-2 428 523 a device for transferring bags or sacks after their manufacture into a scale formation is known, in which a lifting and lowering pressure roller interacts with the last bag deposited and intermittently conveys it with the bags already underneath .

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung, in deren einziger Figur eine Seitenansicht der Vorrichtung zum Herstellen und gruppenweisen Ablegen von Beuteln schematisch dargestellt ist, näher erläutert.An embodiment of the invention is explained in more detail below with reference to the drawing, in the single figure of which a side view of the device for producing and depositing bags in groups is shown schematically.

Zwischen den seitlichen Rahmenwänden 1 des Maschinengestells sind hintere obere und hintere untere Förderbandrollen 2, 3 gelagert. Über diese Förderbandrollen 2, 3 und vordere Förderbandrollen 4, die ebenfalls zwischen den seitlichen Rahmenwänden 1 gelagert sind, laufen die geteilten Förderbänder 5 wm.Rear upper and rear lower conveyor belt rollers 2, 3 are mounted between the side frame walls 1 of the machine frame. The divided conveyor belts 5 wm run over these conveyor belt rollers 2, 3 and front conveyor belt rollers 4, which are also mounted between the side frame walls 1.

Vor dem Förderband 5 ist die Querschweiß-und Querschneideinrichtung 6 angeordnet. Diese besteht aus einem Vorzugsrollenpaar 7, das die beispielsweise von einer Vorratsrolle abgezogene Schlauchfolienbahn 8 intermittierend um jeweils eine Beutel- oder Sacklänge vorzieht. In ringförmigen Nuten der Vorzugsrollen 7 sind beidseits der Schlauchfolienbahn 8 Blasluftdüsen 9 angeordnet, die das jeweils vordere Ende der Schlauchfolienbahn 8 gestreckt vortragen. In Vorschubrichtung hinter den Vorzugswalzen 7 ist eine Querschweißeinrichtung 10 und eine Querschneideinrichtung 11 angeordnet. Soweit ist die Vorrichtung bekannter Bauart.The cross-welding and cross-cutting device 6 is arranged in front of the conveyor belt 5. This consists of a pair of preferred rollers 7 which intermittently pulls the tubular film web 8, which is pulled off from a supply roll, intermittently by one bag or sack length. Blown air nozzles 9 are arranged on both sides of the tubular film web 9 in annular grooves of the preferred rollers 7, which carry the respective front end of the tubular film web 8 stretched. A cross welding device 10 and a cross cutting device 11 are arranged behind the feed rollers 7 in the feed direction. So far, the device is of a known type.

Zwischen der Querschneideinrichtung 11 und der hinteren Umlenkrolle 2 ist ein Saugkasten 32 angeordnet. Dieser Saugkasten 32 ist in nicht dargestellter Weise an eine Saugluftquelle angeschlossen und weist im Abstand voneinander zwei quer verlaufende Saugöffnungsreihen 33, 34 auf. Der Abstand dieser Saugöffnungsreihen 33, 34 voneinander ist dabei so groß wie der Abstand X der auf dem Förderband 5 geschuppt übereinander liegenden Gruppen von Beuteln oder Säcken.A suction box 32 is arranged between the cross cutting device 11 and the rear deflection roller 2. This suction box 32 is connected in a manner not shown to a suction air source and has two transverse rows of suction openings 33, 34 at a distance from one another. The spacing of these rows of suction openings 33, 34 from one another is as large as the spacing X of the groups of bags or sacks that are overlapping on the conveyor belt 5.

Der Abstand der hinteren Sauglochreihe 33 zur Querschneideinrichtung 11 entspricht dem einfachen Schuppenabstand Z der einzelnen Beutel oder Säcke innerhalb einer jeden Gruppe.The distance between the rear row of suction holes 33 and the transverse cutting device 11 corresponds to the simple scale distance Z of the individual bags or sacks within each group.

Im Endbereich der jeweils frei vorgetragenen vorderen Enden der Schlauchfolienbahn ist eine Druckwalze 35 angeordnet, die von einer Druckmittel-Kolben-Zylinder-Einheit 36 betätigt wird, deren Zylinder gestellfest gelagert ist. Unterhalb der Druckwalze 35 ist unter dem Förderband 5 eine Gegendruckwalze 37 vorgesehen, gegen die die abgesenkte Druckwalze die auf dem Förderband liegenden Säcke oder Beutel drückt, so daß diese reibschlüssig aneinander und an das Förderband gehalten sind. Zur Anpassung an unterschiedliche Beutellängen sind die Druckwalze 35 und die Gegendruckwalze 37 in und entgegen der Förderrichtung verschieblich ausgebildet.A pressure roller 35 is arranged in the end region of the front ends of the tubular film web which are freely brought forward and is actuated by a pressure medium-piston-cylinder unit 36, the cylinder of which is mounted on the frame. Below the pressure roller 35, a counter-pressure roller 37 is provided under the conveyor belt 5, against which the lowered pressure roller presses the sacks or bags lying on the conveyor belt, so that they are held against one another and against the conveyor belt. To adapt to different bag lengths, the pressure roller 35 and the counter-pressure roller 37 are designed to be displaceable in and against the conveying direction.

Die Druckwalze 35 senkt sich auf die Gegendruckwalze 37 ab, sobald ein Beutel von dem Messer der Querschneideinrichtung 11 von der Schlauchfolienbahn 8 abgetrennt worden ist, und zwar so lange, bis das hintere offene Ende dieses Sack- oder Beutelstücks über der hinteren Sauglochreihe 33 des Saugkastens 32 liegt und von diesem angesaugt wird. Danach hebt sich die Druckwalze 35 und das nächste Sack- oder Beutelstück wird durch den Blasluftstrom über das von der Sauglochreihe 33 gehaltene Sack- oder Beutelstück ausgetragen. Es ist eine nicht dargestellte Steuereinrichtung vorgesehen, die diesen Vorgang so oft wiederholt, bis eine gewünschte Anzahl von Sackstücken in einer Gruppe geschuppt übereinanderliegend auf das Förderband 5 abgelegt worden ist. Anschließend wird durch entsprechende Steuerung ein größerer Schuppenabstand mit dem Maß X gebildet. Zu diesem Zweck wird die Druckwalze 35 so lange auf die Gegendruckwalze 37 gedrückt, bis das obere Sackstück über die Sauglochreihe 33 hinaus bis zu der vorderen Sauglochreiche 34 gezogen worden ist und von dieser gehalten wird. Das nachfolgende Sackstück wird von der Druckwalze 35 dann nur so lange auf die Gegendruckwalze 37 gedrückt, bis sich sein offenes Ende über der hinteren Sauglochreihe 33 befindet und von dieser festgehalten wird.The pressure roller 35 lowers onto the counter-pressure roller 37 as soon as a bag has been separated from the knife of the cross-cutting device 11 from the tubular film web 8 until the rear open end of this piece of bag or bag lies over the rear row of suction holes 33 of the suction box 32 lies and is sucked in by this. Then the pressure roller 35 lifts and the next piece of bag or bag is discharged by the blown air stream over the bag or bag piece held by the suction hole row 33. A control device (not shown) is provided which repeats this process until a desired number of pieces of sack in a group has been deposited on the conveyor belt 5, one above the other. A larger scale spacing with dimension X is then formed by appropriate control. For this purpose, the pressure roller 35 is pressed onto the counter-pressure roller 37 until the upper piece of bag has been drawn beyond the suction hole row 33 to the front suction hole region 34 and is held by the latter. The subsequent piece of sack is then pressed by the pressure roller 35 onto the counter-pressure roller 37 only until its open end is above the rear suction hole row 33 and is held by it.

Der aus den Blasluftdüsen 9 austretende Blasluftstrom wird intermittierend in der Weise an- und abgeschaltet, daß während des Vorzugs der Beutel durch die Druckwalze 35 der Blasluftstrom abgeschaltet ist. Sobald also ein Beutel gestreckt vorgetragen worden ist, wird die Blasluft abgeschaltet und der Trennschweißvorgang eingeleitet. Der zuletzt abgeschweißte Beutel wird sodann durch die Druckwalze 35 um das den Schuppenabstand bestimmende Maß vorgezogen, bis er auf die in Transportrichtung hintere Sauglochreihe gezogen worden ist und von dieser gehalten wird. Erst danach wird der folgende Beutel durch die Blasluft ausgetragen, so daß immer dann, wenn die Blasluft eingeschaltet ist, kein Beutel ungehaltert ist.The blown air stream emerging from the blown air nozzles 9 is intermittently switched on and off in such a way that the blown air flow is switched off by the pressure roller 35 while the bag is preferred. As soon as a bag is stretched out, the blowing air is switched off and the separation welding process is initiated. The last welded-off bag is then advanced by the pressure roller 35 by the amount determining the scale distance, until it has been drawn onto the rear suction hole row in the transport direction and is held by it. Only then is the following bag discharged through the blown air, so that no bag is unsupported whenever the blown air is switched on.

Durch diese Art der Steuerung ergibt sich eine Schuppe, in der Gruppen von Säcken oder Beuteln durch größere Schuppenabstände X abgetrennt sind. Der Unterdruck für den Saugluftkasten 32 ist dabei so bemessen, daß einerseits der Blasluftstrom, der die Sackstücke austrägt, das Sackende nicht von der Sauglochreihe 33 bzw. 34 abheben kann und daß andererseits die Sackstücke durch Absenken der Druckwalze 35 leicht von dem Saugkasten 32 abgezogen werden können.This type of control results in a scale in which groups of sacks or bags are separated by larger scale distances X. The negative pressure for the suction air box 32 is such that, on the one hand, the blown air flow that discharges the bag pieces cannot lift the end of the bag from the suction hole row 33 or 34, and on the other hand the bag pieces are easily removed from the suction box 32 by lowering the pressure roller 35 can.

Das Gestell der Förderbandes 5 ist über Laufrollen 25 verfahrbar, so daß es zum Austausch beispielsweise des Saugkastens 32 von der Querschweiß- und Schneideinrichtung 6 abgefahren und wieder angestellt werden kann.The frame of the conveyor belt 5 can be moved via rollers 25, so that it can be moved and replaced by the cross-welding and cutting device 6 in order to replace, for example, the suction box 32.

Zweckmäßigerweise ist der Saugkasten 32 über seine gesamte Länge mit Sauglöchern oder Saugschlitzen versehen. Diese Ausgestaltung stellt sicher, daß die Enden der Beutel immer von den Sauglöchern oder Saugschlitzen des Saugkastens angesaugt und gehaltert werden, wobei der gewünschte Schuppenabstand allein durch den jeweiligen Vorzug durch die Druckwalze gebildet wird. Die Verwendung eines derartigen Saugkastens macht auch das intermittierende An- und Abschalten der Saugluft zum Vortragen des jeweiligen Schlauchbahnendes überflüssig, weil jeder neu gebildete Beutel schon beim Absenken des Schweißbalkens oder des Schneidmessers in seinem hinteren Bereich angesaugt und dadurch gehaltert wird. Die Saugkraft ist so zu wählen, daß die hinteren Enden der Beutel einerseits ausreichend gehaltert sind, andererseits die Beutel aber mühelos von der Druckwalze von dem Saugkasten abgezogen werden können.The suction box 32 is expediently provided with suction holes or suction slots over its entire length. This configuration ensures that the ends of the bags are always sucked and held by the suction holes or suction slots of the suction box, the desired scale spacing being formed solely by the particular preference given by the pressure roller. The use of such a suction box also makes the intermittent switching on and off of the suction air for carrying the respective end of the tube superfluous, because each newly formed bag is sucked into its rear region as soon as the welding bar or the cutting knife is lowered and is thereby held. The suction power is to be selected so that the rear ends of the bags are adequately held on the one hand, but on the other hand the bags can be easily removed from the suction box by the pressure roller.

Claims (3)

1. Apparatus for manufacturing plastic bags from an intermittently advanced, flat tubular film (8) and of depositing said bags in shingled groups on an intermittently drivable conveyor belt (5), comprising air blast nozzles (9), which are disposed on opposite sides of the tubular film (8) and advance the leading end of said film in a stretched condition, transverse welding and transverse cutting devices (10, 11), which are cyclically operated to provide the bags with the end seam welds and to sever the bags from the tubular film (8). and a retaining device, which is disposed behind the transverse cutting device (11) in the direction in which the tubular film (8) is advanced and serves to retain each bag adjacent to the rim of its opening when said bag is the last bag that has been severed from the tubular film (8), characterized in that the retaining device consists of a suction box (32), which is provided adjacent to the plane of travel with at least two rows of suction holes (33, 34) extending transversely to the direction of travel and spaced apart approximately like the deposited shingled groups of bags, a liftable and lowerable pressure-applying roller (35) is adapted to be lowered onto the bag which has been deposited last, said roller cooperates with a back-pressure roller (37). which is disposed under the upper course of the conveyor belt (5), said pressure-applying roller is so controlled that during the formation of groups of shingled bags said pressure-applying roller remains in a lowered position until the trailing edge portion is disposed over the rear row of suction holes (33), and that the pressure-applying roller is in its lowered position during the formation of the spacing of the shingled groups until the rear edge portion of the last bag of the group is disposed over the forward row of suction holes (34). and the belt-driving means are operated when the pressure-applying roller (35) is in lowered position.
2. Apparatus according to claim 1. characterized in that the rear row of suction holes (33) in the direction of travel is spaced in front of the transverse cutting device approximately by the distance (Z) by which the shingled bags of a group are spaced apart.
3. Apparatus according to claim 1. characterized in that the suction box (32) is provided with suction holes or suction slots which are slightly space apart along said box.
EP82104205A 1981-05-13 1982-05-13 Apparatus for making and depositing groups of plastic bags Expired EP0064773B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3119005 1981-05-13
DE3119005 1981-05-13
DE3145869 1981-11-19
DE3145869A DE3145869C2 (en) 1981-11-19 1981-11-19 Device for manufacturing and group-wise depositing of plastic bags

Publications (2)

Publication Number Publication Date
EP0064773A1 EP0064773A1 (en) 1982-11-17
EP0064773B1 true EP0064773B1 (en) 1985-04-03

Family

ID=25793230

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Application Number Title Priority Date Filing Date
EP82104205A Expired EP0064773B1 (en) 1981-05-13 1982-05-13 Apparatus for making and depositing groups of plastic bags

Country Status (5)

Country Link
US (1) US4473431A (en)
EP (1) EP0064773B1 (en)
JP (1) JPS58500658A (en)
BR (1) BR8207697A (en)
WO (1) WO1982004011A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3310740A1 (en) * 1983-03-24 1984-10-04 Niedermayr Papierwarenfabrik Ag, 8200 Rosenheim Method and device for the manufacture of sacks with folding bases
US5197727A (en) * 1991-02-06 1993-03-30 Fmc Corporation Interleaving apparatus for rolled up segments
US5161793A (en) * 1991-02-06 1992-11-10 Fmc Corporation Interleaving apparatus for rolled up segments
DE19838736A1 (en) * 1998-08-26 2000-03-02 Winkler & Duennebier Ag - Filing apparatus used at the exit to an envelope production machine has a serrated lock washer arranged in the transition between the production machine and table
CN112077892A (en) * 2020-09-08 2020-12-15 张国良 Plastic product film pressing device convenient for adjusting cutting position and size

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB970959A (en) * 1962-09-27 1964-09-23 Masson Scott & Company Ltd Improvements in and relating to the handling of sheet materials
US3218897A (en) * 1962-12-27 1965-11-23 Smith & Winchester Mfg Company Sheet feeding apparatus
US3315956A (en) * 1964-06-22 1967-04-25 Smith And Winchester Mfg Compa High speed sheet feeding and overlapping system
DE2755160C3 (en) * 1977-12-10 1980-11-06 Jagenberg-Werke Ag, 4000 Duesseldorf Device for decelerating and overlapping sheets or sheets of sheets to be deposited as a stack on a tray
DE2825722C2 (en) * 1978-06-12 1984-09-06 Windmöller & Hölscher, 4540 Lengerich Device for the production of bags or sacks and for their deposition in imbricated formation
DE2833236C2 (en) * 1978-07-28 1982-11-25 Windmöller & Hölscher, 4540 Lengerich Device for manufacturing and stacking plastic bags
DE2841658C2 (en) * 1978-09-25 1980-09-11 Vits-Maschinenbau Gmbh, 4018 Langenfeld Device for shingling and depositing sheets on a stack
DE2902519C2 (en) * 1979-01-23 1985-10-10 Windmöller & Hölscher, 4540 Lengerich Device for depositing sections welded from a film web

Also Published As

Publication number Publication date
EP0064773A1 (en) 1982-11-17
BR8207697A (en) 1983-04-12
US4473431A (en) 1984-09-25
WO1982004011A1 (en) 1982-11-25
JPS58500658A (en) 1983-04-28

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