EP0645238A1 - Apparatus for stacking bags made by separation welding of tubular plastic film or semi-tubular plastic films - Google Patents

Apparatus for stacking bags made by separation welding of tubular plastic film or semi-tubular plastic films Download PDF

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Publication number
EP0645238A1
EP0645238A1 EP94110641A EP94110641A EP0645238A1 EP 0645238 A1 EP0645238 A1 EP 0645238A1 EP 94110641 A EP94110641 A EP 94110641A EP 94110641 A EP94110641 A EP 94110641A EP 0645238 A1 EP0645238 A1 EP 0645238A1
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EP
European Patent Office
Prior art keywords
conveyor
welding
stacking
transport arms
bags
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.)
Withdrawn
Application number
EP94110641A
Other languages
German (de)
French (fr)
Inventor
Friedhelm Mundus
Josef Willing
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
Mondi Gronau GmbH
Original Assignee
M&W Verpackungen Mildenberger and Willing GmbH
Windmoeller and Hoelscher KG
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
Priority claimed from DE4333763A external-priority patent/DE4333763B4/en
Application filed by M&W Verpackungen Mildenberger and Willing GmbH, Windmoeller and Hoelscher KG filed Critical M&W Verpackungen Mildenberger and Willing GmbH
Publication of EP0645238A1 publication Critical patent/EP0645238A1/en
Withdrawn legal-status Critical Current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
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/38—Delivering or advancing articles from machines; Advancing articles to or into piles by movable piling or advancing arms, frames, plates, or like members with which the articles are maintained in face contact
    • B65H29/40—Members rotated about an axis perpendicular to direction of article movement, e.g. star-wheels formed by S-shaped members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/92—Delivering
    • B31B70/98—Delivering in stacks or bundles
    • B31B70/984—Stacking bags on wicket pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/421—Forming a pile
    • B65H2301/4212—Forming a pile of articles substantially horizontal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/30—Chains
    • B65H2404/31—Chains with auxiliary handling means
    • B65H2404/314—Means penetrating in handled material, e.g. needle, pin
    • B65H2404/3141—Wicket pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/60—Other elements in face contact with handled material
    • B65H2404/65—Other elements in face contact with handled material rotating around an axis parallel to face of material and perpendicular to transport direction, e.g. star wheel
    • B65H2404/655—Means for holding material on element
    • B65H2404/6551—Suction means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/12—Surface aspects
    • B65H2701/121—Perforations
    • B65H2701/1212—Perforations where perforations serve for handling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/191—Bags, sachets and pouches or the like

Definitions

  • the invention relates to a device for stacking bags welded from a plastic tube or plastic semi-tubular web, which are transferred from a transfer device consisting of a so-called "wicketer” to a shaft in a stacking station with star arms and pairs arranged on a shaft and rotating about a horizontal axis arranged, upstanding stacking pins or needles carrying holding plate are needled to form stacks.
  • a transfer device consisting of a so-called "wicketer” to a shaft in a stacking station with star arms and pairs arranged on a shaft and rotating about a horizontal axis arranged, upstanding stacking pins or needles carrying holding plate are needled to form stacks.
  • a device of this type for example known from US Pat. No. 4,451,249, is shown schematically.
  • the Wicketer transfer device consists of a shaft 1 mounted in the side parts of a frame, on which two hubs are fastened at a distance from one another, which carry radial transport arms 3 in a star shape at the same angular pitch.
  • the transport arms 3 are hollow and provided with suction air holes for sucking in the bags to be transported.
  • the suction air is fed to the transport arms 3 through grooves in the hubs 2 via so-called "rotary unions".
  • the winding shaft 1 is provided with a conventional rotary drive.
  • a tubular or semi-tubular web 6 drawn off from a supply roll via a web storage device is intermittently by a pair of preferred rolls 4 each advanced by a section length that corresponds to a bag length or width.
  • Blown air tubes 5 are arranged in annular grooves of the preferred rollers 4, which carry out the respectively advanced tubular section stretched between the open jaws 7, 8 of a cross-welding separation station.
  • the upper jaw 8 consists of a heated cutting knife and the lower jaw 7 consists of a roll coated with Teflon, which is rotated by a small angular step after each welding cycle.
  • the bags 10 welded off from the tubular web 6 are then sucked in by the transport arms rotating in the direction of arrow A and needled overhead to the needles of a stacking plate for the purpose of their stacking, which is then conveyed out of the stacking station in time with the stack formation.
  • FIG. 2 shows a speed-time diagram for the preferred rollers 4 and a path-time diagram for the welding jaws 7, 8 of the device explained with reference to FIG. 1.
  • the preferred rollers 4 start running, which have come to a standstill again after the preference of a web section at the time t 1.
  • the welding jaws 8, 7 begin to close.
  • the upper jaw 8 meets the counter-jaw designed as a roller 7.
  • the jaws open again at the time t3, and they have assumed their open position at the time t4.
  • a new clock cycle then begins at time t4.
  • the performance of the machine should be as large as possible, it is necessary to lift the welded bag 10 by the transport arms 3 from the conveyor belt 9 during the opening time alpha, ie during the short period between the times t3 and t4, because immediately after opening the welding jaws, the preferred rollers 4 start again and a collision of the advanced web section with the welded-off bags 10 and the transport arms 3 must be prevented.
  • the times for opening the welding jaw t3 - t4 and for closing the welding jaw t1 - t2 must be kept very short. This means that the transport arms must remove the bags from the belt conveyor 9 during a small angular step at a given speed.
  • An enlargement of the angular step of the transport arms for removing the bags can only be achieved by a higher peripheral speed of the transport arms 3, which means a smaller number of transport arms 3 and thus faster placement and a shorter cooling time for the bags.
  • a longer cooling time is required, which requires a correspondingly larger number of transport arms.
  • An increase in the number of transport arms and correspondingly longer cooling times can, however, only be achieved if the transport arms can remove the bags from the belt conveyor 9 during small angular steps.
  • the cross-welding separating station 7, 8 is located directly in front of the enveloping cylinder of the winding arms 3, and the conveyor belt 9 is almost the entire length between the transport arms 3 arranged.
  • the consequence of this type of advancing, welding and transporting the web sections or bags is that the bag ends 11, as can be seen in FIG. 1, protrude outwards over the winding arms 3 and therefore tend to undesired flutter during transport, which results in a clean needling the bag in the stacking station complicate can.
  • the performance of the known machine is thereby Reduced that the feed of the next web section can only begin when the transport arms 3 have already lifted the bag 10 from the belt conveyor 9 after opening the welding jaws.
  • the object of the invention is to provide a device of the type mentioned, in which the number of transport arms can be increased to extend the cooling time with at least the same power.
  • this object is achieved in a device of the generic type in that the conveyor path of the conveyor between the cross-welding separating station and the enveloping cylinder of the transport arms is equal to a bag length or greater than a bag length.
  • the preferred rollers can start up again and advance or carry forward the next path section, because the conveyor can convey the welded-off bag unhindered by the trailing section between the transport arms. As soon as the tubular web has been pulled forward by a section length, it stops, while the bag, which has already been welded, can be transported by the conveyor over its full length in the conveying direction between the transport arms.
  • each welded bag can not only be inserted so deep between the transport arms that there is no longer a protruding flag, but for the removal of each bag there is the full angular range between successive transport arms are available so that the number of arm pairs increases to extend the cooling time leaves.
  • the conveyor is expediently designed as a suction belt conveyor. This ensures that the welded bags are transported in the correct position.
  • the suction belt conveyor can consist of several perforated belts that run parallel to each other and run over suction boxes in the conveyor section.
  • a hole punch is provided which punctures the web section which is respectively advanced into the cross-welding separation station. Since there is enough space between the welding device and the winder, the hole punch need not be arranged in front of the preferred rollers in the device according to the invention, as is the case, for example, with the device known from US Pat. No. 4,451,249, so that despite the extended intermediate conveyor belt the device according to the invention does not need to have a longer overall length.
  • a pressing roller which can be lowered and lifted in time with the removal of the welded bags is expediently provided, which presses the welded bags onto the conveyor belts or the front deflection roller of the belt conveyor. In this way it is ensured that the welded-on bag does not collide with the re-conveyed hose section when the preferred pair of rollers starts up again.
  • servomotors provided with their own controls are provided at least for driving the feed rollers and the conveyor belt.
  • the performance of the machine can be increased in an optimal way because the preferred rollers can start up as soon as the welding jaws have opened so far that the next path section can be pushed between them.
  • the welding roller forming the lower welding jaw and the winder are also expediently driven by servomotors provided with their own controls.
  • the preferred pair of rollers 4 for the preference of the tubular web 6 with the blowing air nozzles arranged in the annular grooves of the preferred rollers 4, the cross-welding separating station 7, 8 and the shaft 1 with the hubs 2 fastened thereon and the support arms 3 basically have the same configuration as in the case of the 1, known device explained.
  • the device according to the invention differs essentially from the known one in that between the cross-welding separating station 7, 8 and the winder there is a belt conveyor 15 consisting of divided conveyor belts, the conveying path between the cross-welding separating device and the enveloping cylinder of the winding arms is greater than a length of the welded bag 10 in the conveying direction.
  • the conveyor path of the belt conveyor 15 is located approximately in one plane, which is in the horizontal through the line of contact of the welding jaws 7, 8 and one Position located pair of conveyor arms 3 is spanned.
  • the perforated conveyor belts 16 of the belt conveyor 15 run at a distance from one another via deflection rollers 17, 18.
  • the drive roller 19 of the conveyor belts 16 is located in the lower run between the deflection rollers 20, 21.
  • the upper strands of the perforated conveyor belts 16 run over conventional suction boxes 22 provided with suction slits.
  • the suction power of the suction boxes 22 is dimensioned such that the transport arms 3 provided with suction air nozzles can lift the workpieces 10 conveyed between them without distortion.
  • a roller 24 which can be raised and lowered via a pneumatic cylinder, is provided, which presses the welded bags 10 against the deflection roller 17 in time with the removal.
  • hole punches 25 are arranged, which provide the welded bags with a hole pattern corresponding to the position of the pins 26.
  • the pins 26 are arranged on belts, chains or plates of a conventional stacking belt conveyor 27.
  • the preferred rollers 4, the welding roller 7 forming the lower welding jaw, the drive roller 19 of the conveyor belt 15 and the drive of the winding shaft 1 are with their own drive servomotors which have their own controls.
  • the controls are coordinated so that the device works with the highest performance.
  • the conveyor belt 15 conveys the welded bags 10 so deep between the paired arms 3 that the ends of the bags do not over the outer ends during the conveyance the conveyor arms 3 survive.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)

Abstract

In an apparatus for stacking bags made by separation welding of tubular plastic film or semi-tubular plastic film, these are impaled, to form stacks, on a holding plate which carries stacking pins or stacking needles which project upwards and is arranged in a stacking station, by a transfer device which consists of a so-called "Wicketer" having transport arms which are arranged like a star and in pairs, rotate about a horizontal axis and are fastened on a shaft. A conveyor, consisting of an endless belt, conveys the separation-welded bags from a transverse welding and separating station into the region of the transport arms. In order to be able to increase the number of the transport arms to lengthen the cooling time, at at least equal loading, the conveyor path of the conveyor between the transverse welding and separating station and the enveloping cylinder of the transport arms is equal to one bag length or greater than one bag length. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Stapeln von von einer Kunststoffschlauch- oder Kunststoffhalbschlauchbahn abgeschweißten Beutein, die von einer aus einem sogenannten "Wicketer" bestehenden Übergabeeinrichtung mit an einer Welle befestigten und um eine horizontale Achse rotierenden, sternartig und paarweise angeordneten Transportarmen auf eine in einer Stapelstation angeordnete, aufragende Stapelstifte oder -nadeln tragende Halteplatte zur Bildung von Stapeln aufgenadelt werden.The invention relates to a device for stacking bags welded from a plastic tube or plastic semi-tubular web, which are transferred from a transfer device consisting of a so-called "wicketer" to a shaft in a stacking station with star arms and pairs arranged on a shaft and rotating about a horizontal axis arranged, upstanding stacking pins or needles carrying holding plate are needled to form stacks.

In Fig. 1 der Zeichnung ist schematisch eine beispielsweise aus der US-PS 4,451,249 bekannte Vorrichtung dieser Art dargestellt. Die Wicketer-Übergabeeinrichtung besteht aus einer in den Seitenteilen eines Gestells gelagerten Welle 1, auf der im Abstand voneinander zwei Naben befestigt sind, die in gleicher Winkelteilung sternförmig radiale Transportarme 3 tragen. Die Transportarme 3 sind hohl ausgebildet und mit Saugluftbohrungen zum Ansaugen der zu transportierenden Beutel versehen. Die Saugluft wird den Transportarmen 3 durch Nuten in den Naben 2 über sogenannte "Drehdurchführungen" zugeführt. Die Wicketerwelle 1 ist mit einem üblichen Drehantrieb versehen. Eine von einer Vorratsrolle über einen Bahnspeicher abgezogene Schlauch- oder Halbschlauchbahn 6 wird intermittierend durch ein Vorzugsrollenpaar 4 jeweils um eine Abschnittlänge vorgezogen, die einer Beutellänge oder -breite entspricht. In Ringnuten der Vorzugsrollen 4 sind Blasluftröhrchen 5 angeordnet, die den jeweils vorgeschobenen Schlauchbahnabschnitt gestreckt zwischen den geöffneten Backen 7, 8 einer Querschweiß-Trenn-Station vortragen. Dabei besteht der obere Backen 8 aus einem beheizten Trennmesser und der untere Backen 7 aus einer mit Teflon beschichteten Rolle, die nach jedem Schweißtakt um einen kleinen Winkelschritt weitergedreht wird. Zwischen den Transportarmen 3 ist ein aus endlosen parallelen Bändern bestehender Bandförderer 9 angeordnet, auf den sich der jeweils vorgeschobene Schlauchbahnabschnitt legt. Die von der Schlauchbahn 6 abgeschweißten Beutel 10 werden sodann von den in Richtung des Pfeils A rotierenden Transportarmen angesaugt und über Kopf auf die Nadeln einer Stapelplatte zum Zwecke ihrer Stapelung aufgenadelt, die dann im Takt der Stapelbildung aus der Stapelstation abgefördert wird.In Fig. 1 of the drawing, a device of this type, for example known from US Pat. No. 4,451,249, is shown schematically. The Wicketer transfer device consists of a shaft 1 mounted in the side parts of a frame, on which two hubs are fastened at a distance from one another, which carry radial transport arms 3 in a star shape at the same angular pitch. The transport arms 3 are hollow and provided with suction air holes for sucking in the bags to be transported. The suction air is fed to the transport arms 3 through grooves in the hubs 2 via so-called "rotary unions". The winding shaft 1 is provided with a conventional rotary drive. A tubular or semi-tubular web 6 drawn off from a supply roll via a web storage device is intermittently by a pair of preferred rolls 4 each advanced by a section length that corresponds to a bag length or width. Blown air tubes 5 are arranged in annular grooves of the preferred rollers 4, which carry out the respectively advanced tubular section stretched between the open jaws 7, 8 of a cross-welding separation station. The upper jaw 8 consists of a heated cutting knife and the lower jaw 7 consists of a roll coated with Teflon, which is rotated by a small angular step after each welding cycle. Between the transport arms 3 there is a belt conveyor 9 consisting of endless parallel belts, on which the respectively advanced tubular section lies. The bags 10 welded off from the tubular web 6 are then sucked in by the transport arms rotating in the direction of arrow A and needled overhead to the needles of a stacking plate for the purpose of their stacking, which is then conveyed out of the stacking station in time with the stack formation.

Aus Fig. 2 ist ein Geschwindigkeits-Zeit-Diagramm für die Vorzugsrollen 4 und ein Weg-Zeit-Diagramm für die Schweißbacken 7, 8 der anhand der Fig. 1 erläuterten Vorrichtung ersichtlich. Zur Zeit t₀ laufen die Vorzugsrollen 4 an, die nach Vorzug eines Bahnabschnitts zur Zeit t₁ wieder zum Stillstand gekommen sind. Sobald die Vorzugsrollen den abzuschweißenden Bahnabschnitt vorgezogen haben, beginnen sich die Schweißbacken 8, 7 zu schließen. Im Zeitpunkt t₂ trifft die obere Backe 8 auf die als Rolle ausgebildete Gegenbacke 7. Nach Ablauf der Schweißzeit öffnen die Backen zum Zeitpunkt t₃ wieder, und sie haben zum Zeitpunkt t₄ ihre Öffnungsstellung eingenommen. Im Zeitpunkt t₄ beginnt sodann ein neuer Taktzyklus. Da die Leistung der Maschine möglichst groß sein soll, ist es erforderlich, während der Öffnungszeit alpha, also während des kurzen Zeitabschnitts zwischen den Zeitpunkten t₃ und t₄, den abgeschweißten Beutel 10 durch die Transportarme 3 von dem Förderband 9 abzuheben, weil sofort nach dem Öffnen der Schweißbacken die Vorzugsrollen 4 wieder anlaufen und eine Kollision des vorgeschobenen Bahnabschnitts mit den abgeschweißten Beuteln 10 sowie den Transportarmen 3 verhindert werden muß. Um eine hohe Leistung zu erreichen, also die Taktzeiten zur Herstellung eines Beutels kurz zu halten, müssen die Zeiten zum Öffnen der Schweißbacke t3 - t4 und zum Schließen der Schweißbacke t1 - t2 sehr kurz gehalten werden. Dies bedeutet, daß die Transportarme bei gegebener Drehzahl die Beutel während eines kleines Winkelschrittes von dem Bandförderer 9 abnehmen müssen. Eine Vergrößerung des Winkelschrittes der Transportarme zur Abnahme der Beutel kann nur durch eine höhere Umfangsgeschwindigkeit der Transportarme 3 erreicht werden, was eine geringere Anzahl von Transportarmen 3 und damit ein schnelleres Ablegen und eine kürzere Kühlzeit für die Beutel bedeutet. Bei dickeren Materialien wird jedoch eine längere Kühlzeit benötigt, die eine entsprechende größere Anzahl von Transportarmen bedingt. Eine Vergrößerung der Anzahl der Transportarme und entsprechend längere Kühlzeiten lassen sich aber nur verwirklichen, wenn die Transportarme die Beutel während kleiner Winkelschritte von dem Bandförderer 9 abnehmen können.FIG. 2 shows a speed-time diagram for the preferred rollers 4 and a path-time diagram for the welding jaws 7, 8 of the device explained with reference to FIG. 1. At the time t₀ the preferred rollers 4 start running, which have come to a standstill again after the preference of a web section at the time t 1. As soon as the preferred rollers have advanced the web section to be welded, the welding jaws 8, 7 begin to close. At the time t₂, the upper jaw 8 meets the counter-jaw designed as a roller 7. After the welding time, the jaws open again at the time t₃, and they have assumed their open position at the time t₄. A new clock cycle then begins at time t₄. Since the performance of the machine should be as large as possible, it is necessary to lift the welded bag 10 by the transport arms 3 from the conveyor belt 9 during the opening time alpha, ie during the short period between the times t₃ and t₄, because immediately after opening the welding jaws, the preferred rollers 4 start again and a collision of the advanced web section with the welded-off bags 10 and the transport arms 3 must be prevented. In order to achieve high performance, i.e. to keep the cycle times for producing a bag short, the times for opening the welding jaw t3 - t4 and for closing the welding jaw t1 - t2 must be kept very short. This means that the transport arms must remove the bags from the belt conveyor 9 during a small angular step at a given speed. An enlargement of the angular step of the transport arms for removing the bags can only be achieved by a higher peripheral speed of the transport arms 3, which means a smaller number of transport arms 3 and thus faster placement and a shorter cooling time for the bags. With thicker materials, however, a longer cooling time is required, which requires a correspondingly larger number of transport arms. An increase in the number of transport arms and correspondingly longer cooling times can, however, only be achieved if the transport arms can remove the bags from the belt conveyor 9 during small angular steps.

Um bei den bekannten Vorrichtung die Taktzeiten zur Herstellung der Beutel möglichst kurz halten zu können, befindet sich die Querschweiß-Trenn-Station 7,8 unmittelbar vor dem Hüllzylinder der Wicketerarme 3, und das Förderband 9 ist fast mit seiner gesamten Länge zwischen den Transportarmen 3 angeordnet. Die Folge dieser Art des Vorschiebens, Abschweißens und Transportierens der Bahnabschnitte bzw. Beutel ist, daß die Beutelenden 11 der aus Fig. 1 ersichtlichen Weise die Wicketerarme 3 nach außen hin überrragen können und daher beim Transport zu einem unerwünschten Flattern neigen, was ein sauberes Aufnadeln der Beutel in der Stapelstation erschweren
kann. Weiterhin ist die Leistung der bekannten Maschine dadurch vermindert, daß mit dem Vorschub des nächsten Bahnabschnittserst dann begonnen werden kann, wenn nach dem Öffnen der Schweißbacken die Transportarme 3 den Beutel 10 bereits von dem Bandförderer 9 abgehoben haben.In order to keep the cycle times for the production of the bags as short as possible in the known device, the cross-welding separating station 7, 8 is located directly in front of the enveloping cylinder of the winding arms 3, and the conveyor belt 9 is almost the entire length between the transport arms 3 arranged. The consequence of this type of advancing, welding and transporting the web sections or bags is that the bag ends 11, as can be seen in FIG. 1, protrude outwards over the winding arms 3 and therefore tend to undesired flutter during transport, which results in a clean needling the bag in the stacking station complicate
can. Furthermore, the performance of the known machine is thereby Reduced that the feed of the next web section can only begin when the transport arms 3 have already lifted the bag 10 from the belt conveyor 9 after opening the welding jaws.

Aufgabe der Erfindung ist es, eine Vorrichtung der eingangs angegebenen Art zu schaffen, bei der sich bei mindestens gleicher Leistung die Anzahl der Transportarme zur Verlängerung der Kühlzeit vergrößern läßt.The object of the invention is to provide a device of the type mentioned, in which the number of transport arms can be increased to extend the cooling time with at least the same power.

Erfindungsgemäß wird diese Aufgabe bei einer Vorrichtung der gattungsgemäßen Art dadurch gelöst, daß die Förderstrecke des Förderers zwischen der Querschweiß-Trenn-Station und dem Hüllzylinder der Transportarme gleich einer Beutellänge oder größer ist als eine Beutellänge.According to the invention, this object is achieved in a device of the generic type in that the conveyor path of the conveyor between the cross-welding separating station and the enveloping cylinder of the transport arms is equal to a bag length or greater than a bag length.

Bei der erfindungsgemäßen Vorrichtung können sofort mit dem Öffnen der Schweißbacken der Querschweiß-Trenn-Station die Vorzugsrollen wieder anlaufen und den nächstfolgenden Bahnabschnitt vorschieben bzw. vortragen, weil der Förderer den jeweils abgeschweißten Beutel unbehindert von dem nachlaufenden Abschnitt zwischen die Transportarme fördern kann. Sobald die Schlauchbahn um eine Abschnittlänge vorgezogen worden ist, bleibt diese stehen, während der bereits abgeschweißte Beutel von dem Förderer über seine volle Länge in Förderrichtung zwischen die Transportarme transportiert werden kann. Da also der Förderer den Abtransport der abgeschweißten Beutel ungehindert von dem nachgeschobenen Schlauchabschnitt vornehmen kann, läßt sich jeder abgeschweißte Beutel nicht nur so tief zwischen die Transportarme einfahren, daß keine überstehende Fahne mehr verbleibt, sondern zum Abtransport jedes Beutels steht der volle Winkelbereich zwischen aufeinanderfolgenden Transportarmen zur Verfügung, so daß sich die Anzahl der Armpaare zur Verlängerung der Kühlzeit vergrößern läßt.In the device according to the invention, when the welding jaws of the cross-welding separating station are opened, the preferred rollers can start up again and advance or carry forward the next path section, because the conveyor can convey the welded-off bag unhindered by the trailing section between the transport arms. As soon as the tubular web has been pulled forward by a section length, it stops, while the bag, which has already been welded, can be transported by the conveyor over its full length in the conveying direction between the transport arms. So since the conveyor can remove the welded bags unhindered from the tube section pushed in, each welded bag can not only be inserted so deep between the transport arms that there is no longer a protruding flag, but for the removal of each bag there is the full angular range between successive transport arms are available so that the number of arm pairs increases to extend the cooling time leaves.

Der Förderer ist zweckmäßigerweise als Saugbandförderer ausgebildet. Auf diese Weise ist ein lagegenauer Transport der abgeschweißten Beutel sichergestellt. Dabei kann der Saugbandförderer aus mehreren gelochten, parallel zueinander umlaufenden Bändern bestehen, die in der Förderstrecke über Saugkästen laufen.The conveyor is expediently designed as a suction belt conveyor. This ensures that the welded bags are transported in the correct position. The suction belt conveyor can consist of several perforated belts that run parallel to each other and run over suction boxes in the conveyor section.

Nach einer Weiterbildung der Erfindung ist vorgesehen, daß eine den jeweils in die Querschweiß-Trenn-Station vorgeschobenen Bahnabschnitt lochende Lochstanze vorgesehen ist. Da zwischen der Schweißeinrichtung und dem Wicketer genügend Platz vorhanden ist, braucht bei der erfindungsgemäßen Vorrichtung die Lochstanze nicht vor den Vorzugsrollen angeordnet zu werden, wie es beispielsweise bei der aus der US-PS 4,451,249 bekannten Vorrichtung der Fall ist, so daß trotz des verlängerten Zwischenförderbandes die erfindungsgemäße Vorrichtung keine größere Baulänge aufzuweisen braucht.According to a development of the invention, it is provided that a hole punch is provided which punctures the web section which is respectively advanced into the cross-welding separation station. Since there is enough space between the welding device and the winder, the hole punch need not be arranged in front of the preferred rollers in the device according to the invention, as is the case, for example, with the device known from US Pat. No. 4,451,249, so that despite the extended intermediate conveyor belt the device according to the invention does not need to have a longer overall length.

Zweckmäßigerweise ist eine im Takt der Abförderung der abgeschweißten Beutel absenkbare und hebbare Andrückwalze vorgesehen, die die abgeschweißten Beutel an die Förderbänder bzw. die vordere Umlenkrolle des Bandförderers andrückt. Auf diese Weise ist sichergestellt, daß es bei dem erneuten Anlaufen des Vorzugsrollenpaares nicht zu einer Kollision des abgeschweißten Beutels mit dem nachgeförderten Schlauchabschnitt kommt.A pressing roller which can be lowered and lifted in time with the removal of the welded bags is expediently provided, which presses the welded bags onto the conveyor belts or the front deflection roller of the belt conveyor. In this way it is ensured that the welded-on bag does not collide with the re-conveyed hose section when the preferred pair of rollers starts up again.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß mindestens zum Antrieb der Vorzugswalzen und des Förderbandes mit eigenen Steuerungen versehene Servomotoren vorgesehen sind. Auf diese Weise läßt sich die Leistung der Maschine in optimaler Weise steigern, weil die Vorzugsrollen bereits anlaufen können, sobald sich die Schweißbacken so weit geöffnet haben, daß der nächste Bahnabschnitt zwischen diesem hindurchgeschoben werden kann. Zweckmäßigerweise sind auch die die untere Schweißbacke bildende Schweißrolle und der Wicketer mit mit eigenen Steuerungen versehenen Servomotoren angetrieben.In a further embodiment of the invention it is provided that servomotors provided with their own controls are provided at least for driving the feed rollers and the conveyor belt. In this way, the performance of the machine can be increased in an optimal way because the preferred rollers can start up as soon as the welding jaws have opened so far that the next path section can be pushed between them. The welding roller forming the lower welding jaw and the winder are also expediently driven by servomotors provided with their own controls.

Sind die Antriebe des Vorzugsrollenpaares und des Förderbandes mit selbständig steuerbaren Servomotoren versehen, lassen sich die aus dem Diagramm gemäß Fig. 2 ersichtlichen Zeiten zwischen den Zeitpunkten t₁ und t₂ sowie t₃ und t₄ auf ein Minimum und damit die Stillstandszeit beta der Vorzugsrollen verkürzen. Die erfindungsgemäße Vorrichtung führt somit nicht nur zu einer verbesserten Ablage der abgeschweißten Beutel, sondern auch zu einer Leistungssteigerung.Are the drives of the preferred roller pair and the conveyor belt with independently controllable servomotors, can be seen from the diagram in FIG. 2 times between the times t₁ and t₂ and t₃ and t₃ to a minimum and thus shorten the downtime beta of the preferred rollers. The device according to the invention thus not only leads to an improved placement of the welded bags, but also to an increase in performance.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Fig. 3 näher erläutert.An embodiment of the invention is explained below with reference to FIG. 3.

Das Vorzugsrollenpaar 4 zum Vorzug der Schlauchbahn 6 mit den in Ringnuten der Vorzugsrollen 4 angeordneten Blasluftdüsen, die Querschweiß-Trenn-Station 7, 8 und die Welle 1 mit auf dieser befestigten Naben 2 und den Tragarmen 3 weist grundsätzlich die gleiche Ausgestaltung auf wie bei der anhand der Fig. 1 erläuterten, bekannten Vorrichtung.The preferred pair of rollers 4 for the preference of the tubular web 6 with the blowing air nozzles arranged in the annular grooves of the preferred rollers 4, the cross-welding separating station 7, 8 and the shaft 1 with the hubs 2 fastened thereon and the support arms 3 basically have the same configuration as in the case of the 1, known device explained.

Die erfindungsgemäße Vorrichtung unterscheidet sich von der bekannten im wesentlichen dadurch, daß zwischen der Querschweiß-Trenn-Station 7, 8 und dem Wicketer ein aus geteilten Förderbändern bestehender Bandförderer 15 angeordnet ist, dessen Förderstrecke zwischen der Querschweiß-Trenn-Einrichtung und dem Hüllzylinder der Wicketerarme größer ist als eine Länge des abgeschweißten Beutels 10 in Förderrichtung. Die Förderstrecke des Bandförderers 15 befindet sich etwa in einer Ebene, die durch die Berührungslinie der Schweißbacken 7, 8 und einem in der horizontalen Lage befindlichen Paar von Förderarmen 3 aufgespannt ist. Die gelochten Förderbänder 16 des Bandförderers 15 laufen im Abstand voneinander über Umlenkrollen 17, 18. Die Antriebsrolle 19 der Förderbänder 16 befindet sich im Untertrum zwischen den Umlenkrollen 20, 21.The device according to the invention differs essentially from the known one in that between the cross-welding separating station 7, 8 and the winder there is a belt conveyor 15 consisting of divided conveyor belts, the conveying path between the cross-welding separating device and the enveloping cylinder of the winding arms is greater than a length of the welded bag 10 in the conveying direction. The conveyor path of the belt conveyor 15 is located approximately in one plane, which is in the horizontal through the line of contact of the welding jaws 7, 8 and one Position located pair of conveyor arms 3 is spanned. The perforated conveyor belts 16 of the belt conveyor 15 run at a distance from one another via deflection rollers 17, 18. The drive roller 19 of the conveyor belts 16 is located in the lower run between the deflection rollers 20, 21.

Die oberen Trume der gelochten Förderbänder 16 laufen über übliche, mit Saugschlitzen versehene Saugkästen 22. Dabei ist die Saugkraft der Saugkästen 22 so bemessen, daß die mit Saugluftdüsen versehenen Transportarme 3 die zwischen diese geförderten Werkstücke 10 verzerrungsfrei abheben können.The upper strands of the perforated conveyor belts 16 run over conventional suction boxes 22 provided with suction slits. The suction power of the suction boxes 22 is dimensioned such that the transport arms 3 provided with suction air nozzles can lift the workpieces 10 conveyed between them without distortion.

Oberhalb der auflaufseitigen Umlenkrolle 17 ist eine über einen Pneumatikzylinder heb- und absenkbare Rolle 24 vorgesehen, die die abgeschweißten Beutel 10 im Takt der Abförderung an die Umlenkrolle 17 andrückt.Above the deflection roller 17 on the upstream side, a roller 24, which can be raised and lowered via a pneumatic cylinder, is provided, which presses the welded bags 10 against the deflection roller 17 in time with the removal.

Weiterhin sind unmittelbar hinter der Querschweiß-Trenn-Vorrichtung 7, 8 Lochstanzen 25 angeordnet, die die abgeschweißten Beutel mit einem der Lage der Stifte 26 entsprechenden Lochmuster versehen. Die Stifte 26 sind auf Bändern, Ketten oder Platten eines üblichen Stapelbandförderers 27 angeordnet.Furthermore, immediately behind the cross-welding separating device 7, 8 hole punches 25 are arranged, which provide the welded bags with a hole pattern corresponding to the position of the pins 26. The pins 26 are arranged on belts, chains or plates of a conventional stacking belt conveyor 27.

Die Vorzugsrollen 4, die die untere Schweißbacke bildende Schweißrolle 7, die Antriebsrolle 19 des Förderbandes 15 und der Antrieb der Wicketerwelle 1 sind mit eigenen Antriebs-Servomotoren, die eigene Steuerungen besitzen. Dabei sind die Steuerungen derart aufeinander abgestimmt, daß die Vorrichtung mit höchster Leistung arbeitet.The preferred rollers 4, the welding roller 7 forming the lower welding jaw, the drive roller 19 of the conveyor belt 15 and the drive of the winding shaft 1 are with their own drive servomotors which have their own controls. The controls are coordinated so that the device works with the highest performance.

Das Förderband 15 fördert die abgeschweißten Beutel 10 jeweils so tief zwischen die paarweise angeordneten Arme 3, daß die Enden der Beutel während der Förderung nicht über die äußeren Enden der Förderarme 3 überstehen.The conveyor belt 15 conveys the welded bags 10 so deep between the paired arms 3 that the ends of the bags do not over the outer ends during the conveyance the conveyor arms 3 survive.

Claims (6)

Vorrichtung zum Stapeln von von einer Kunststoffschlauch- oder Kunststoff-Halbschlauchbahn (6) abgeschweißten Beuteln (10), die von einer aus einem sogenannten "Wicketer" bestehenden Übergabeeinrichtung mit an einer Welle (1) befestigten und um eine horizontale Achse rotierenden, sternartig und paarweise angeordneten Transportarmen (3) auf eine in einer Stapelstation angeordnete, aufragende Stapelstifte (26) oder -nadeln tragenden Halteplatte zur Bildung von Stapeln aufgenadelt werden, mit einem aus einem endlosen Band oder endlosen Bändern bestehenden Förderer (15), der die abgeschweißten Beutel (10) von einer Querschweiß-Trenn-Station (7, 8) in den Bereich der Transportarme (3) fördert,
dadurch gekennzeichnet,
daß die Förderstrecke des Förderers (15) zwischen der Quertrenn-Schweiß-Station (7, 8) und dem Hüllzylinder der Transportarme (3) gleich einer Beutellänge oder größer ist als eine Beutellänge.Device for stacking bags (10) welded from a plastic tube or plastic half-tube web (6), which are secured by a transfer device consisting of a so-called "wicketer" with a shaft (1) and rotating about a horizontal axis, star-like and in pairs arranged transport arms (3) are needled onto a holding plate arranged in a stacking station and carrying upstanding stacking pins (26) or needles to form stacks, with a conveyor (15) consisting of an endless belt or belts, which transports the welded bags (10 ) from a cross welding separation station (7, 8) into the area of the transport arms (3),
characterized by
that the conveyor path of the conveyor (15) between the cross-cutting welding station (7, 8) and the enveloping cylinder of the transport arms (3) is equal to a bag length or greater than a bag length. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Förderer (15) ein Saugbandförderer ist.Apparatus according to claim 1, characterized in that the conveyor (15) is a suction belt conveyor. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Saugbandförderer (15) aus mehreren gelochten, parallel zueinander umlaufenden Bändern (16) besteht, die in der Förderstrecke über Saugkästen (22) laufen.Apparatus according to claim 2, characterized in that the suction belt conveyor (15) consists of a plurality of perforated belts (16) which run parallel to one another and which run in the conveying path over suction boxes (22). Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß eine den jeweils in die Querschweiß-Trenn-Station vorgeschobenen Bahnabschnitt lochende Lochstanze (25) vorgesehen ist.Device according to one of claims 1 to 3, characterized in that a hole punch (25) is provided which perforates the web section which is respectively advanced into the cross-welding separating station. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß eine im Takt der Abförderung der abgeschweißten Beutel (10) absenkbare und hebbare Andrückwalze (24) vorgesehen ist, die die abgeschweißten Beutel (10) an den Förderer (15) andrückt.Device according to one of claims 1 to 4, characterized in that a pressing roller (24) which can be lowered and raised in time with the removal of the welded bags (10) is provided, which presses the welded bags (10) onto the conveyor (15). Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß mindestens zum Antrieb der Vorzugswalzen (4) und des Förderbandes (15) eigene Steuerungen aufweisende Servomotoren vorgesehen sind.Device according to one of claims 1 to 5, characterized in that servomotors having their own controls are provided at least for driving the feed rollers (4) and the conveyor belt (15).
EP94110641A 1993-08-25 1994-07-08 Apparatus for stacking bags made by separation welding of tubular plastic film or semi-tubular plastic films Withdrawn EP0645238A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4328592 1993-08-25
DE4328592 1993-08-25
DE4333763 1993-10-04
DE4333763A DE4333763B4 (en) 1993-08-25 1993-10-04 Device for stacking bags welded from a plastic tube or plastic half-tube web

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Publication number Priority date Publication date Assignee Title
EP1055627A2 (en) * 1999-05-28 2000-11-29 LEMO Maschinenbau GmbH Device for stacking and transporting plastic bags, in particular bags for automatic machines
CN106927284A (en) * 2015-12-31 2017-07-07 上海东冠纸业有限公司 A kind of napkin paper machine point paper device
CN107600589A (en) * 2017-10-27 2018-01-19 重庆恒茂包装制品有限公司 Automatic wrapping machine and fully automatic system

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US4260147A (en) * 1978-05-24 1981-04-07 Gloucester Engineering Co., Inc. Utilization of air jets for discharge conveyor on wicketing systems
EP0050860A1 (en) * 1980-10-23 1982-05-05 Windmöller &amp; Hölscher Device for forming and stapling segments separated from a tubular foil web
US4451249A (en) * 1980-09-26 1984-05-29 Debin Rene F Manufacture of thermoplastic bags
US4954033A (en) * 1984-06-11 1990-09-04 Unico, Inc. Transfer mechanism for conveyor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260147A (en) * 1978-05-24 1981-04-07 Gloucester Engineering Co., Inc. Utilization of air jets for discharge conveyor on wicketing systems
US4451249A (en) * 1980-09-26 1984-05-29 Debin Rene F Manufacture of thermoplastic bags
EP0050860A1 (en) * 1980-10-23 1982-05-05 Windmöller &amp; Hölscher Device for forming and stapling segments separated from a tubular foil web
US4954033A (en) * 1984-06-11 1990-09-04 Unico, Inc. Transfer mechanism for conveyor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1055627A2 (en) * 1999-05-28 2000-11-29 LEMO Maschinenbau GmbH Device for stacking and transporting plastic bags, in particular bags for automatic machines
EP1055627A3 (en) * 1999-05-28 2002-05-02 LEMO Maschinenbau GmbH Device for stacking and transporting plastic bags, in particular bags for automatic machines
US6457927B1 (en) 1999-05-28 2002-10-01 Lemo Maschinenbau Gmbh Apparatus for stacking and delivering plastic bags, especially bags for packaging machines
CN106927284A (en) * 2015-12-31 2017-07-07 上海东冠纸业有限公司 A kind of napkin paper machine point paper device
CN106927284B (en) * 2015-12-31 2019-05-21 上海东冠纸业有限公司 A kind of napkin paper machine point paper device
CN107600589A (en) * 2017-10-27 2018-01-19 重庆恒茂包装制品有限公司 Automatic wrapping machine and fully automatic system

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