EP0195345B1 - Method and apparatus for strapping a package with a strapping band - Google Patents

Method and apparatus for strapping a package with a strapping band Download PDF

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Publication number
EP0195345B1
EP0195345B1 EP86103181A EP86103181A EP0195345B1 EP 0195345 B1 EP0195345 B1 EP 0195345B1 EP 86103181 A EP86103181 A EP 86103181A EP 86103181 A EP86103181 A EP 86103181A EP 0195345 B1 EP0195345 B1 EP 0195345B1
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EP
European Patent Office
Prior art keywords
band
drive
strapping
speed
main
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.)
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EP86103181A
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German (de)
French (fr)
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EP0195345A3 (en
EP0195345A2 (en
Inventor
Nikolaus Stamm
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A Konrad Feinmechanik AG
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A Konrad Feinmechanik AG
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Publication of EP0195345A2 publication Critical patent/EP0195345A2/en
Publication of EP0195345A3 publication Critical patent/EP0195345A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B13/00—Bundling articles
    • B65B13/18—Details of, or auxiliary devices used in, bundling machines or bundling tools
    • B65B13/22—Means for controlling tension of binding means

Definitions

  • the invention relates to a method for strapping a packaged item with a strapping band according to the preamble of claim 1, and a machine for strapping the packaged item according to the preamble of claim 2.
  • Various methods and machines are known for strapping packaged goods with one or more strapping tapes. This is to stretch the strapping around the packaged goods, connect the end of the strap to the strap, and separate the strap from the strap stock.
  • machines for strapping packaged goods of larger dimensions it is known from CH 662 791 to allow the strapping process to take place without manual intervention.
  • the packaged goods are placed on a base provided with a yoke, in which a strap-pushing device is installed, with which the strapping band is pushed through the yoke, in which case the packaged goods are bypassed in a large loop until the strap end reaches a connecting station and there is held.
  • the strap pushing device is then switched to strap retraction, the strapping being placed around the packaged goods, tensioned and connected to the strap end and separated from the strap supply.
  • the highest possible strap speeds are used.
  • the band feed at high speed into the yoke-shaped band channel is not a particular problem and is relatively easy to achieve.
  • the tape can only be retracted so quickly that no tension peaks occur when the strap driving the strap is shut off that could either tear the strapping or damage the packaged goods. This means that the tape must be retracted at a lower speed, but this has an adverse effect on the strapping performance.
  • Such strapping machines are known from GB-B-1 545396 and from US-A-4 161 910, in which the changeover to the higher or the lower band speed is carried out by means of a manual transmission.
  • the machine shown in FIGS. 1 and 2 shows two phases of automatic strapping of a packaged product with a strapping.
  • the machine has a base with a yoke-shaped band channel 2 arranged thereon.
  • a container 4 for receiving a supply of a strapping.
  • the strapping 5 can be introduced into the container 4 with a strap feed 6.
  • the strapping 5 can be pushed back and forth by a reversible belt slide drive 7.
  • the belt slide drive 7 has a main belt drive 11 designed as a force-fitting pair of rollers and a secondary belt drive 12 designed as a pair of rollers.
  • the main belt drive 11 and the sub-belt drive 12 are operated together by a motor, e.g. an electric motor 13, as will be shown in detail with reference to FIG. 3.
  • Fig. 2 the strapping machine is shown when strapping the packaged goods 8.
  • the band slide drive 7 is reversed to retract the band.
  • the strapping band is now returned to the container 4, the band detaching from the band channel 2 and wrapping lightly around the packaged goods 8, as can be seen in FIG. 2.
  • the strapping process should also be carried out at the highest possible speed.
  • the tape advance in tape channel 2 is carried out at high speed.
  • the main tape drive When the end of the tape arrives in the connecting station 10, the main tape drive is uncoupled. Depending on the size of the moving masses of the main belt drive 11, it runs a little further after uncoupling and can do so form a loose band loop 14. Since the moving grips are relatively small, the strap loop 14 is also relatively small.
  • the main belt drive 11 After uncoupling the main belt drive 11, it is reversed for the belt retraction. The retreat is carried out at great speed.
  • the main belt drive 11 also drives the secondary belt drive 12, namely its pair of rollers is driven at a greater speed than the pair of rollers of the main belt drive 11. As a result, less belt length is returned to the container 4 than is supplied by the secondary belt drive 12.
  • a collecting magazine 16 is provided in the interior 3 of the base 1 for receiving the tape reserve. If, for any reason, the band reserve 15 would fill up the collecting magazine, a fill level indicator 17 is provided, which provides a signal for switching off the machine.
  • the formation of the band reserve 15 continues until the strapping band 5 easily wraps around the packaged goods 8. Then the main belt drive 11 is switched to a second, lower belt retraction speed. At this speed, the tape reserve 15 is first used up, i.e. the band reserve 15 is pushed back into the container 4. As soon as the band reserve 15 is used up, the strapping band 5 wrapped around the packaged goods 8 is pulled back and in this case tensioned as far as this corresponds to the setting of an electromagnetic clutch which is arranged in the drive branch for the second lower speed.
  • the secondary belt drive 12 disengages itself - directly to the strapping band, but only connected via the band reserve 15, so that when the speed changes, the switching from Usually two electromagnetic clutches are connected, no additional forces are exerted on the strapping and thus on the packaged goods 8. It is thus achieved with the belt reserve 15 that the electromagnetic clutch, which is decisive for the main belt drive 11 for the second, lower speed, responds exactly at the set belt tension. Nevertheless, the strap retraction takes place at the highest possible speed when the strapping band passes from the band channel 2 to the packaged goods 8, so that the entire strapping process takes place at the greatest possible speed, but without dangerous tensions.
  • FIG. 3 the belt slide drive of the machine shown in Figs. 1 and 2 is shown schematically.
  • the main belt drive and the secondary belt drive are designated by the reference numerals 11 and 12 as in FIGS. 1 and 2.
  • the two drives 11, 12 and the associated drive parts are mounted in a wall 18 of the base 1.
  • the connection station 10 is also fixed, with which at the end of the strapping process the end of the strap is connected to the strap, e.g. welded, and the tape is separated from the tape supply.
  • the motor 13 drives via an enveloping drive 19, which consists of two wheels 20, 21 and an enveloping member 22, e.g. a toothed belt, there is a distribution shaft 25, which drives a first clutch shaft 27 via a further cladding drive 26 and a main clutch shaft 30 via a gear train 28.
  • a second clutch shaft 29 is driven by the first clutch shaft 27 via a gear train 31 with a gear ratio of 1: 1.
  • Each clutch shaft 27, 29 has an electromagnetic clutch 32, 34, with which the clutch shafts 27 or 29 can be coupled to the enveloping drive 26.
  • the coupling shafts 27, 29 drive a pinion 36 in opposite directions of rotation via a gear 35, on which a roller 40 of a pair of rollers 40, 41 (see FIGS.
  • the roller 40 is a wheel of an enveloping drive 37, the enveloping member 38 of which drives a wheel 39 on the main clutch shaft 30.
  • the roller 41 is an adjustable, e.g. eccentric roller with which the tension of the enveloping member 38 is adjusted.
  • the strapping 5 is, see FIGS. 1 and 2, non-positively guided over the pair of rollers 40, 41, it lies on the roller 40 on the enveloping member 38 and is pressed on the roller 41 by the enveloping member 38 onto the circumference of the roller 41.
  • the frictional connection that can be achieved in this way can transmit a multiple of the greatest tensioning force of the strapping 5.
  • the wheel 39 of the enveloping drive 37 is connected to a wheel 43 of an enveloping drive 42, the further wheel 44 of which is connected to a roller 50 of a further pair of rollers 50, 51 of the auxiliary belt drive 12.
  • the non-driven roller 51 of the auxiliary belt drive 12 is rotatably supported in an eccentric sleeve 50 such that the two rollers 50, 51 can form clamping rollers for the strapping 5 lying between them when the strap is retracted, but not during the tape advance.
  • An electromagnetic main clutch 52 is mounted on the main clutch shaft 30, the armature 53 of which is slidably mounted on a pinion 54 connected to the wheel 39 of the enveloping drive 37.
  • the motor 13 drives the pair of rollers 40, 41 of the main belt drive 11 via the enveloping drives 19, 26 and one of the two coupling shafts 27, 29, which are switched accordingly by the clutches 32, 34 the auxiliary belt drive 12 runs somewhat faster.
  • the strapping tape 5 is introduced into the tape channel 2 at the first higher speed.
  • the main drive 11 is reversed by switching one of the clutches 27, 29.
  • the tape is now retracted at the first higher speed until the strapping 5 easily wraps around the packaged goods 8.
  • the secondary belt drive 12 is driven via the enveloping drives 37, 45 at a somewhat greater speed than the speed of the pair of rollers 40, 41, as a result of which the belt reserve 15 mentioned is now formed.
  • the motor 13 now drives the gear 39 via the gear train 28, whereby the pair of rollers 40, 41 of the main belt drive 12 is driven at the second, lower speed.
  • the tape reserve is now used up by withdrawing the tape and then the strapping is tightened around the packaged goods 8 in accordance with the tensioning force set on the main coupling 52.
  • a second sensor 59 detects the reduction in speed when the set tension force is reached and thereby activates the connecting station 10, which now ends the strapping process by connecting the end of the strap and the strap and severing the strap supply.
  • the tape placed around the packaged goods 8 is free of tension and stands still.
  • the auxiliary belt drive 12 is set in such a way that it runs in this standstill phase but does not exert any force on the belt.
  • the tape reserve 15 is used up, the tape is brought up to the tension set on the main coupling 52 and the connection station 10 is activated.
  • the switching of the main clutch 52 and the clutches 27, 29 thus takes place in a standstill phase in which the belt is not additionally stressed. Even if the time interval for switching the clutches 27, 29, 52 is very short, the distance traveled by the belt is approximately 0.5 m at the first, higher speed of approximately 5 m / s used. If the tape reserve 15 were missing, considerable additional stresses of the tape with the known disadvantages could occur during the switching time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Umreilung eines Packgutes mit einem Umreifungsband nach dem Oberbegriff des Patentanspruches 1, und eine Maschine zum Umreifen des Packgutes nach dem Oberbegriff des Patentanspruches 2.The invention relates to a method for strapping a packaged item with a strapping band according to the preamble of claim 1, and a machine for strapping the packaged item according to the preamble of claim 2.

Zum Umreifen eines Packgutes mit einem oder mehreren Umreifungsbändern sind verschiedene Verfahren und Maschinen bekannt. Damit soll das um das Packgut gelegte Umreifungsband gespannt, das Bandende mit dem Band verbunden und das Band vom Bandvorrat getrennt werden. Bei Maschinen für das Umreifen von Packgut grösserer Dimensionen ist es aus CH 662 791 bekannt, den Umreifungsvorgang ohne manuellen Eingriff ablaufen zu lassen. Bei dieser Ausführungsform wird das Packgut auf einen mit einem Joch versehenen Sockel gestellt, in welchem eine Bandschiebevorrichtung eingebaut ist, mit welcher das Umreifungsband durch das Joch geschoben wird hierbei das Packgut in einer grossen Schlinge umfahren wird, bis das Bandende in eine Verbindungsstation gelangt und dort gehalten wird. Die Bandschiebevorrichtung wird darauf auf Bandrückzug geschaltet, wobei das Umreifungsband um das Packgut gelegt, gespannt und mit dem Bandende verbunden sowie vom Bandvorrat getrennt wird.Various methods and machines are known for strapping packaged goods with one or more strapping tapes. This is to stretch the strapping around the packaged goods, connect the end of the strap to the strap, and separate the strap from the strap stock. In machines for strapping packaged goods of larger dimensions, it is known from CH 662 791 to allow the strapping process to take place without manual intervention. In this embodiment, the packaged goods are placed on a base provided with a yoke, in which a strap-pushing device is installed, with which the strapping band is pushed through the yoke, in which case the packaged goods are bypassed in a large loop until the strap end reaches a connecting station and there is held. The strap pushing device is then switched to strap retraction, the strapping being placed around the packaged goods, tensioned and connected to the strap end and separated from the strap supply.

Um eine grosse Umreifungsleistung mit solchen Bandumreifungsmaschinen zu erreichen, wird mit möglichst hohen Bandgeschwindigkeiten gearbeitet. Hierbei stellt der Bandsvorschub mit hoher Geschwindigkeit in den jochförmigen Bandkanal kein besonderes Problem dar und ist verhältnismässig leicht zu erreichen. Soll aber der Bandrückzug und das Umlegen des Umreifungsbandes auf das Packstück schnell und mit einer Spannkraft erfolgen, bei der das Packgut geschont und doch genügend gespannt wird, kann der Bandrückzug nur so schnell erfolgen, dass beim Abschalten des das Band kraftschlüssig führenden Bandantriebes keine Spannungspitzen auftreten, die entweder das Umreifungsband zerreissen oder das Packgut beschädigen könnten. Dies bedeutet, dass der Bandrückzug mit kleinerer Geschwindigkeit erfolgen muss, was sich aber auf die Umreifungsleistung ungünstig auswirkt. Solche Umreifungsmaschinen sind aus GB-B-1 545396 und aus US-A-4 161 910 bekannt, bei denen das Umschalten auf die grössere oder die kleinere Bandgeschwindigkeit mittels eines Schaltgetriebes erfolgt.In order to achieve a high strapping performance with such strapping machines, the highest possible strap speeds are used. Here, the band feed at high speed into the yoke-shaped band channel is not a particular problem and is relatively easy to achieve. However, if the tape is to be retracted and the strapping folded onto the package quickly and with a tensioning force that protects the packaged goods and yet is sufficiently tensioned, the tape can only be retracted so quickly that no tension peaks occur when the strap driving the strap is shut off that could either tear the strapping or damage the packaged goods. This means that the tape must be retracted at a lower speed, but this has an adverse effect on the strapping performance. Such strapping machines are known from GB-B-1 545396 and from US-A-4 161 910, in which the changeover to the higher or the lower band speed is carried out by means of a manual transmission.

Hier setzt die Erfindung ein, der die Aufgabe zugrundeliegt, ein Verfahren und eine Maschine der eingangs beschriebenen Art so auszugestalten, dass zwar der Bandrückzug mit grosser Geschwindigkeit erfolgt und das Umschalten auf die kleinere Geschwindigkeit erst kurz vor dem Erreichen der Endspannung vorgenommen wird, dass aber Spannungsspitzen beim Umreifungsband beim Umschalten des Bandantriebes vermieden werden. Diese Aufgabe wird gemäss der Erdindung durch die kennzeichnenden Merkmale der Patentansprüche 1 und 2 gelöst.This is where the invention comes in, which is based on the object of designing a method and a machine of the type described at the outset in such a way that the tape is retracted at high speed and the switch to the lower speed is only carried out shortly before the final tension is reached, but that Tension peaks in the strapping can be avoided when switching the belt drive. This object is achieved according to the earth connection by the characterizing features of claims 1 and 2.

Die Erfindung ist in der Zeichnung in einem Ausführungsbeispiel dargestellt und nachfolgend beschrieben. Es zeigen:

  • Fig. 1 eine Seitenansicht, teilweise im Schnitt, einer Maschine zum selbsttätigen Umreifen eines Packgutes mit einem Umreifungsband, wobei das Umreifungsband durch einen Bandkanal geführt wird und das Bandende eine Verbindungsstation erreicht hat,
  • Fig. 2 eine weitere Seitenansicht der Maschine nach Fig. 1, bei der das im Bandkanal geführte Band leicht um das Packgut zurückgezogen und gleichzeitig beim Bandschiebeantrieb eine Bandreserve gebildet ist, und
  • Fig. 3 eine schematische Darstellung des Antriebes der Maschine nach Fig. 1 und 2.
The invention is shown in the drawing in one embodiment and described below. Show it:
  • 1 is a side view, partly in section, of a machine for the automatic strapping of a packaged item with a strapping band, the strapping band being guided through a band channel and the end of the band having reached a connecting station,
  • FIG. 2 shows a further side view of the machine according to FIG. 1, in which the band guided in the band channel is slightly withdrawn around the packaged goods and, at the same time, a band reserve is formed in the band slide drive, and
  • 3 shows a schematic representation of the drive of the machine according to FIGS. 1 and 2.

Die in Fig. 1 und 2 dargestellte Maschine zeigt zwei Phasen einer selbsttätigen Umreifung eines Packgutes mit einem Umreifungsband. Die Maschine weist einen Sockel mit einem darauf angeordneten jochförmigen Bandkanal 2 auf. In seinem Innenraum 3 ist ein Behälter 4 zur Aufnahme eines Vorrates eines Umreifungsbandes angebracht. Mit einer Bandzuführung 6 kann das Umreifungsband 5 in den Behälter 4 eingebracht werden.The machine shown in FIGS. 1 and 2 shows two phases of automatic strapping of a packaged product with a strapping. The machine has a base with a yoke-shaped band channel 2 arranged thereon. In its interior 3 there is a container 4 for receiving a supply of a strapping. The strapping 5 can be introduced into the container 4 with a strap feed 6.

Das Umreifungsband 5 kann durch einen reversierbaren Bandschiebeantrieb 7 vor- und zurückgeschoben werden. Beim Bandvorlauf wird das Band in Führungen (nicht dargestellt) des Bandkanals 2 geführt, wobei um das Packgut 8 eine Schlinge 9 gebildet wird, bei der das Bandende in eine unter dem Packgut 8 liegende Verbindungsstation 10 gelegt und dort festgehalten wird. Der Bandschiebeantrieb 7 weist einen als kraftschlüssiges Rollenpaar ausgebildeten Hauptbandantrieb 11 und einen, als Rollenpaar ausgebildeten Nebenbandantrieb 12 auf. Der Hauptbandantrieb 11 und der Nebenbandantrieb 12 werden gemeinsam von einem Motor, z.B. einem elektrischen Motor 13 angetrieben, wie noch anhand von Fig. 3 im Detail dargestellt wird.The strapping 5 can be pushed back and forth by a reversible belt slide drive 7. During the tape advance, the tape is guided in guides (not shown) of the tape channel 2, a loop 9 being formed around the packaged goods 8, in which the tape end is placed in a connecting station 10 below the packaged goods 8 and held there. The belt slide drive 7 has a main belt drive 11 designed as a force-fitting pair of rollers and a secondary belt drive 12 designed as a pair of rollers. The main belt drive 11 and the sub-belt drive 12 are operated together by a motor, e.g. an electric motor 13, as will be shown in detail with reference to FIG. 3.

In Fig. 2 ist die Bandumreifungsmaschine beim Umreifen des Packgutes 8 dargestellt. Sobald das Ende des Umreifungsbandes 5 in der Verbindungstation 10 gehalten ist, wird der Bandschiebeantrieb 7 auf Bandrückzug reversiert. Nun wird das Umreifungsband in den Behälter 4 zurückgeführt, wobei sich das Band aus dem Bandkanal 2 löst und sich leicht um das Packgut 8 legt, wie dies aus Fig. 2 ersichtlich ist. Nun ist es erwünscht, dass das Umreifungsband 5 so um das Packgut 8 gelegt und gespannt wird, dass weder das Band 5 zerrissen noch das Packgut 8 durch eine zu grosse Bandspannung beschädigt wird. Andererseits soll auch der Umreifungsvorgang mit grösstmöglicher Geschwindigkeit durchgeführt werden. Zu diesem Zweck wird der Bandvorlauf im Bandkanal 2 mit grosser Geschwindigkeit durchgeführt.In Fig. 2, the strapping machine is shown when strapping the packaged goods 8. As soon as the end of the strapping band 5 is held in the connection station 10, the band slide drive 7 is reversed to retract the band. The strapping band is now returned to the container 4, the band detaching from the band channel 2 and wrapping lightly around the packaged goods 8, as can be seen in FIG. 2. It is now desirable that the strapping 5 is placed around the packaged goods 8 and tensioned in such a way that neither the band 5 is torn nor the packaged goods 8 is damaged by excessive belt tension. On the other hand, the strapping process should also be carried out at the highest possible speed. For this purpose, the tape advance in tape channel 2 is carried out at high speed.

Beim Eintreffen des Bandendes in der Verbindungsstation 10 wird der Hauptbandantrieb entkuppelt. Je nach der Grösse der bewegten Massen des Hauptbandantriebes 11 läuft dieser nach dem Entkuppeln etwas weiter und kann hierbei eine lose Bandschlaufe 14 bilden. Da die bewegten fassen verhältnismässig klein sind, ist auch die Bandschlaufe 14 verhältnismässig klein.When the end of the tape arrives in the connecting station 10, the main tape drive is uncoupled. Depending on the size of the moving masses of the main belt drive 11, it runs a little further after uncoupling and can do so form a loose band loop 14. Since the moving grips are relatively small, the strap loop 14 is also relatively small.

Nach dem Abkupplen des Hauptbandantriebes 11 wird er für den Bandrückzug reversiert. Der Rückzug wird hierbei mit grosser Geschwindigkeit vorgenommen. Mit dem Hauptbandantrieb 11 wird auch der Nebenbandantrieb 12 angetrieben, und zwar wird dessen Rollenpaar mit einer grösseren Geschwindigkeit angetrieben als das Rollenpaar des Hauptbandantriebes 11. Dadurch wird erreicht, dass weniger Bandlänge in den Behälter 4 zurückgeführt wird, als vom Nebenbandantrieb 12 geliefert wird. Dadurch entsteht eine Bandreserve 15 in Form einer Schlaufe, deren Grösse sich aus der Differenz der beiden Bandgeschwindigkeiten der Antriebe 11 und 12 und der Differenz zwischen Bandlänge im Bandkanal und der Länge für die Umreifung des Packgutes 8 ergibt. Für die Aufnahme der Bandreserve ist ein Auffangmagazin 16 im Innenraum 3 des Sockels 1 vorgesehen. Falls aus irgendeinem Grund die Bandreserve 15 das Auffangmagazin auffüllen würde, ist ein Füllstandsanzeiger 17 vorgesehen, der ein Signal für das Abstellen der Maschine liefert.After uncoupling the main belt drive 11, it is reversed for the belt retraction. The retreat is carried out at great speed. The main belt drive 11 also drives the secondary belt drive 12, namely its pair of rollers is driven at a greater speed than the pair of rollers of the main belt drive 11. As a result, less belt length is returned to the container 4 than is supplied by the secondary belt drive 12. This creates a strap reserve 15 in the form of a loop, the size of which results from the difference between the two strap speeds of the drives 11 and 12 and the difference between the strap length in the strap channel and the length for the strapping of the packaged goods 8. A collecting magazine 16 is provided in the interior 3 of the base 1 for receiving the tape reserve. If, for any reason, the band reserve 15 would fill up the collecting magazine, a fill level indicator 17 is provided, which provides a signal for switching off the machine.

Die Bildung der Bandreserve 15 erfolgt solange, bis das Umreifungsband 5 sich leicht um das Packgut 8 legt. Dann erfolgt die Umschaltung des Hauptbandantriebes 11 auf eine zweite, kleinere Bandrückzuggeschwindigkeit. Mit dieser Geschwindigkeit wird zunächst die Bandreserve 15 aufgebraucht, d.h. die Bandreserve 15 wird in den Behälter 4 zurückgeschoben. Sobald die Bandreserve 15 aufgebraucht ist, wird das um das Packgut 8 gelegte Umreifungsband 5 zurückgezogen und hierbei so weit gespannt, wie dies der Einstellung einer elektromagnetischen Kupplung entspricht, die im Antriebzweig für die zweite kleinere Geschwindigkeit angeordnet ist.The formation of the band reserve 15 continues until the strapping band 5 easily wraps around the packaged goods 8. Then the main belt drive 11 is switched to a second, lower belt retraction speed. At this speed, the tape reserve 15 is first used up, i.e. the band reserve 15 is pushed back into the container 4. As soon as the band reserve 15 is used up, the strapping band 5 wrapped around the packaged goods 8 is pulled back and in this case tensioned as far as this corresponds to the setting of an electromagnetic clutch which is arranged in the drive branch for the second lower speed.

Solange der Hauptbandantrieb 11 die Bandreserve 15 zurückzieht, besteht ein Unterbruch im Bandtransport der um das Packgut 8 gelegten Bandschlinge. Beim Umschalten von der ersten, höheren Rückzugeschwindigkeit auf die zweite, kleinere Geschwindigkeit sind keine Massen-der Nebenbandantrieb 12 kuppelt sich selbst aus--mit dem Umreifungsband direkt, sondern nur über die Bandreserve 15 verbunden, so dass beim Geschwindigkeitswechsel, der mit dem Umschalten von meistens zwei elektromagnetischen Kupplungen verbunden ist, keine zusätzlichen Kräfte auf das Umreifungsband und damit auf das Packgut 8 ausgeübt werden. Man erreicht somit mit der Bandreserve 15, dass die für den Hauptbandantrieb 11 für die zweite, kleinere Geschwindigkeit massgebende Elektromagnetkupplung bei der eingestellten Bandspannung exakt anspricht. Trotzdem vollzieht sich der Bandrückzug beim Uebergang des Umreifungsbandes aus dem Bandkanal 2 auf das Packgut 8 mit einer möglichst grossen Geschwindigkeit, so dass der gesamte Umreifungsvorgang mit grösstmöglicher Geschwindigkeit, jedoch ohne gefährliche Spannungen abläuft.As long as the main belt drive 11 withdraws the belt reserve 15, there is an interruption in the belt transport of the belt loop placed around the packaged goods 8. When switching from the first, higher retraction speed to the second, lower speed, there are no masses - the secondary belt drive 12 disengages itself - directly to the strapping band, but only connected via the band reserve 15, so that when the speed changes, the switching from Usually two electromagnetic clutches are connected, no additional forces are exerted on the strapping and thus on the packaged goods 8. It is thus achieved with the belt reserve 15 that the electromagnetic clutch, which is decisive for the main belt drive 11 for the second, lower speed, responds exactly at the set belt tension. Nevertheless, the strap retraction takes place at the highest possible speed when the strapping band passes from the band channel 2 to the packaged goods 8, so that the entire strapping process takes place at the greatest possible speed, but without dangerous tensions.

In Fig. 3 ist der Bandschiebenantrieb der in Fig. 1 und 2 dargestellten Maschine schematisch dargestellt. Hierbei sind der Hauptbandantrieb und der Nebenbandantrieb mit den Bezugszeichen 11 und 12 wie in Fig. 1 und 2 bezeichnet. Die beiden Antriebe 11, 12 und die dazugehörigen Antriebsteile sind in einer Wand 18 des Sockels 1 gelagert. In dieser Wand ist auch die Verbindungsstation 10 befestigt, mit der am Ende des Umreifungsvorganges das Bandende mit dem Band verbunden, z.B. verschweisst, und das Band vom Bandvorrat getrennt wird.In Fig. 3, the belt slide drive of the machine shown in Figs. 1 and 2 is shown schematically. Here, the main belt drive and the secondary belt drive are designated by the reference numerals 11 and 12 as in FIGS. 1 and 2. The two drives 11, 12 and the associated drive parts are mounted in a wall 18 of the base 1. In this wall the connection station 10 is also fixed, with which at the end of the strapping process the end of the strap is connected to the strap, e.g. welded, and the tape is separated from the tape supply.

Der Motor 13 treibt über einen Hülltrieb, 19, der aus zwei Rädern 20, 21 und einem Hüllglied 22, z.B. einem Zahnriemen, besteht, eine Verteilwelle 25 an, die über einen weiteren Hülltrieb 26 eine erste Kupplungswelle 27 und über ein Zahnradvorgelege 28 eine Hauptkupplungswelle 30 antreibt. Von der ersten Kupplungswells 27 wird über ein Zahnradvorgelege 31 mit einem Uebersetzungsverhältnis von 1:1 eine zweite Kupplungswelle 29 angetrieben. Jede Kupplungswelle 27, 29 weist eine elektromagnetische Schaltkupplung 32, 34 auf, mit der die Kupplungswellen 27 oder 29 mit dem Hülltrieb 26 gekuppelt werden können. Die Kupplungswellen 27, 29 treiben über ein Zahnrad 35 ein Zahnritzel 36 in entgegengesetzten Drehrichtungen an, auf dem eine Rolle 40 eines Rollenpaars 40, 41 (siehe Fig. 1 und 2) des Hauptbandantriebes 11 befestigt ist. Die Rolle 40 ist ein Rad eines Hülltriebes 37, dessen Hüllglied 38 ein Rad 39 auf der Hauptkupplungswelle 30 antreibt. Die Rolle 41 ist eine einstellbare, z.B. exzentrische Rolle, mit der die Spannung des Hüllgliedes 38 eingestellt wird.The motor 13 drives via an enveloping drive 19, which consists of two wheels 20, 21 and an enveloping member 22, e.g. a toothed belt, there is a distribution shaft 25, which drives a first clutch shaft 27 via a further cladding drive 26 and a main clutch shaft 30 via a gear train 28. A second clutch shaft 29 is driven by the first clutch shaft 27 via a gear train 31 with a gear ratio of 1: 1. Each clutch shaft 27, 29 has an electromagnetic clutch 32, 34, with which the clutch shafts 27 or 29 can be coupled to the enveloping drive 26. The coupling shafts 27, 29 drive a pinion 36 in opposite directions of rotation via a gear 35, on which a roller 40 of a pair of rollers 40, 41 (see FIGS. 1 and 2) of the main belt drive 11 is fastened. The roller 40 is a wheel of an enveloping drive 37, the enveloping member 38 of which drives a wheel 39 on the main clutch shaft 30. The roller 41 is an adjustable, e.g. eccentric roller with which the tension of the enveloping member 38 is adjusted.

Das Umreifungsband 5 ist, siehe Fig. 1 und 2, über das Rollenpaar 40, 41 kraftschlüssig geführt, wobei es auf der Rolle 40 auf dem Hüllglied 38 liegt und auf der Rolle 41 von dem Hüllglied 38 auf den Umfang der Rolle 41 gepresst wird. Der dadurch erzielbare Kraftschluss kann ein Mehrfaches der grössten Spannkraft des Umreifungsbandes 5 übertragen.The strapping 5 is, see FIGS. 1 and 2, non-positively guided over the pair of rollers 40, 41, it lies on the roller 40 on the enveloping member 38 and is pressed on the roller 41 by the enveloping member 38 onto the circumference of the roller 41. The frictional connection that can be achieved in this way can transmit a multiple of the greatest tensioning force of the strapping 5.

Das Rad 39 des Hülltriebes 37 ist mit einem Rad 43 eines Hülltriebes 42 verbunden, dessen weiteres Rad 44 mit einer Rolle 50 eines weiteren Rollenpaars 50, 51 des Nebenbandantriebes 12 verbunden ist. Die nicht angetriebene Rolle 51 des Nebenbandantriebes 12 ist in einer exzentrischen Hülse 50 derart drehbar gelagert, dass die beiden Rollen 50, 51 beim Bandrückzug Klemmrollen für das dazwischenliegende Umreifungsband 5 bilden können, nicht aber beim Bandvorlauf.The wheel 39 of the enveloping drive 37 is connected to a wheel 43 of an enveloping drive 42, the further wheel 44 of which is connected to a roller 50 of a further pair of rollers 50, 51 of the auxiliary belt drive 12. The non-driven roller 51 of the auxiliary belt drive 12 is rotatably supported in an eccentric sleeve 50 such that the two rollers 50, 51 can form clamping rollers for the strapping 5 lying between them when the strap is retracted, but not during the tape advance.

Auf der Hauptkupplungswelle 30 ist eine elektromagnetische Hauptkupplung 52 gelagert, deren Anker 53 auf einem mit dem Rad 39 des Hülltriebes 37 verbundenen Ritzel 54 verschiebbar gelagert ist.An electromagnetic main clutch 52 is mounted on the main clutch shaft 30, the armature 53 of which is slidably mounted on a pinion 54 connected to the wheel 39 of the enveloping drive 37.

Der Bandschiebeantrieb nach Fig. 3 arbeitet wie folgt:3 operates as follows:

Beim Bandvorlauf treibt der Motor 13 über die Hülltriebe 19, 26 und eine der beiden Kupplungswellen 27, 29, die durch die Kupplungen 32, 34 entsprechend geschaltet werden, das Rollenpaar 40, 41 des Hauptbandantriebes 11 an, während der Nebenbandantrieb 12 etwas schneller mitläuft. Da aber am Nebenbandantrieb 12 beim Bandvorlauf kein Kraftschluss besteht, entsteht nur eine kleine unbedeutende Reibung am vorlaufenden Band durch die Rollen 50, 51. Das Umreifungsband 5 wird hierbei mit der ersten grösseren Geschwindigkeit in den Bandkanal 2 eingebracht. Sobald das Bandende in der Verbindungsstation 10 ankommt, wird der Hauptantrieb 11 durch Schalten einer der Kupplungen 27, 29 reversiert. Der Bandrückzug erfolgt nun mit der ersten grösseren Geschwindigkeit, bis das Umreifungsband 5 sich leicht um das Packgut 8 legt. Während dieser Zeit ist der Nebenbandantrieb 12 über die Hülltriebe 37, 45 mit einer etwas grösseren Geschwindigkeit als die Geschwindigkeit des Rollenpaares 40, 41 angetrieben, wodurch nun die erwähnte Bandreserve 15 gebildet wird. Sobald sich das Umreifungsband 5 um das Packgut 8 legt, wird dessen Geschwindigkeit am Nebenbandantrieb 12, kleiner, was durch einen Sensor 58 festgestellt wird, der nun die Schaltung der Hauptkupplung 52 einleitet, wobei gleichzeitig auch die eingeschaltete Kupplung der beiden Kupplungen 27, 29 gelöst wird. Der Motor 13 treibt nun über das Zahnradvorgelege 28 das Rad 39 an, wodurch das Rollenpaar 40, 41 des Hauptbandantriebes 12 mit der zweiten, kleineren Geschwindigkeit angetrieben wird. Es wird nun die Bandreserve durch Rückzug des Bandes aufgebraucht und dann das Umreifungsband um das Packgut 8 entsprechend der an der Hauptkupplung 52 eingestellten Spannkraft gespannt. Durch einen zweiten Sensor 59 wird die Drehzahlverminderung bei Erreichen der eingestellten Spannkraft festgestellt und dadurch die Verbindungsstation 10 aktiviert, die nun den Umreifungsvorgang durch Verbinden des Bandendes und des Bandes und Abtrennen des Bandvorrates beendet.During tape advance, the motor 13 drives the pair of rollers 40, 41 of the main belt drive 11 via the enveloping drives 19, 26 and one of the two coupling shafts 27, 29, which are switched accordingly by the clutches 32, 34 the auxiliary belt drive 12 runs somewhat faster. However, since there is no non-positive connection on the secondary belt drive 12 during the tape advance, only a small, insignificant friction occurs on the leading tape due to the rollers 50, 51. The strapping tape 5 is introduced into the tape channel 2 at the first higher speed. As soon as the end of the tape arrives in the connecting station 10, the main drive 11 is reversed by switching one of the clutches 27, 29. The tape is now retracted at the first higher speed until the strapping 5 easily wraps around the packaged goods 8. During this time, the secondary belt drive 12 is driven via the enveloping drives 37, 45 at a somewhat greater speed than the speed of the pair of rollers 40, 41, as a result of which the belt reserve 15 mentioned is now formed. As soon as the strapping 5 wraps around the packaged goods 8, its speed at the auxiliary belt drive 12 becomes smaller, which is determined by a sensor 58 which now initiates the switching of the main clutch 52, the clutch of the two clutches 27, 29 also being released at the same time becomes. The motor 13 now drives the gear 39 via the gear train 28, whereby the pair of rollers 40, 41 of the main belt drive 12 is driven at the second, lower speed. The tape reserve is now used up by withdrawing the tape and then the strapping is tightened around the packaged goods 8 in accordance with the tensioning force set on the main coupling 52. A second sensor 59 detects the reduction in speed when the set tension force is reached and thereby activates the connecting station 10, which now ends the strapping process by connecting the end of the strap and the strap and severing the strap supply.

Während des Rückzuges der Bandreserve 5 ist das um das Packgut 8 gelegte Band spannungsfrei und steht still. Der Nebenbandantrieb 12 ist so eingestellt, dass er in dieser Stillstandsphase zwar mitläuft, aber keine Kraft auf das Band ausübt. Ist die Bandreserve 15 aufgebraucht, wird das Band noch auf die an der Hauptkupplung 52 eingestellte Spannung gebracht und die Verbindungsstation 10 aktiviert.During the withdrawal of the tape reserve 5, the tape placed around the packaged goods 8 is free of tension and stands still. The auxiliary belt drive 12 is set in such a way that it runs in this standstill phase but does not exert any force on the belt. When the tape reserve 15 is used up, the tape is brought up to the tension set on the main coupling 52 and the connection station 10 is activated.

Das Umschalten der Hauptkupplung 52 und der Kupplungen 27, 29 erfolgt somit in einer Stillstandsphase, in der das Band nicht zusätzlich beansprucht wird. Wenn auch der Zeitintervall für das Schalten der Kupplungen 27, 29, 52 sehr kurz ist, beträgt bei der verwendeten ersten, grösseren Geschwindigkeit von etwa 5 m/s der zurückgelegte Weg des Bandes gegen 0,5 m. Wenn die Bandreserve 15 fehlen würde, könnten doch in der Schaltzeit erhebliche Zusatzbeanspruchugnen des Bandes mit den bekannten Nachteilen auftreten.The switching of the main clutch 52 and the clutches 27, 29 thus takes place in a standstill phase in which the belt is not additionally stressed. Even if the time interval for switching the clutches 27, 29, 52 is very short, the distance traveled by the belt is approximately 0.5 m at the first, higher speed of approximately 5 m / s used. If the tape reserve 15 were missing, considerable additional stresses of the tape with the known disadvantages could occur during the switching time.

In Fig. 3 sind die Lager zur Lagerung der rotierenden Teile nicht speziell bezeichnet, doch sind sie durchwegs durch mit Diagonalen versehene Rechtecke dargestellt. Auch die Kupplungen 27, 29 sind nur soweit erläutert, als es für die Funktion erforderlich ist. Es werden hierbei durchwegs normale handelsübliche Elektromagnetkupplungen eingesetzt, wobei die Hauptkupplung 52 zusätzlich verbessert ist, wie dies in dem vorstehend bezeichneten Patent erläutert ist.In Fig. 3, the bearings for the storage of the rotating parts are not specifically designated, but they are represented throughout by diagonally provided rectangles. The clutches 27, 29 are only explained to the extent necessary for their function. In this case, normal commercially available electromagnetic clutches are used throughout, the main clutch 52 being additionally improved, as is explained in the patent referred to above.

Claims (8)

1. Process for strapping a package (8) with a strapping band (5), wherein the band is taken by a drive of a band store and then loosely looped around the package until the end of the band is taken up at a connection station (10) and held there, whereon the band is pulled back until it lies loosely around the package with a first higher speed and then up until tensioning of the band to the desired tension with a second smaller speed, as well as connected in the connection station with the end of the band, characterised in that for the transition from the first to the second speed the band transport is interrupted, wherein the interruption is achieved during the pulling back of the strapping band at the first speed by means of a reserve of band (15) which is formed between the connection station (10) and a main band drive (11) whereon, after changeover in the main band drive from the first to the second speed, the band reserve is used up by the band return and then the band is tensioned.
2. Machine for strapping a package with a switchable main band drive (11) driven by a motor for the feed of the end of the band about a package (8) up to receipt and holding of the end of the band in a connecting station (10) and for the pulling back of the band loosely looped about the package, characterised in that between the main band drive (11) and the connection station (10) there is arranged an auxiliary band drive (12) which, during the band return up until the loose lying around of the strapping band (5) on the package (8), has a greater band speed than the band speed of the main band drive (5).
3. Machine according to Claim 2, characterised in that the auxiliary band drive (11) is constructed as a return drive with a pair of rollers (50, 51) wherein, on band return with the first greater band speed as pair of rolls, they work as band entrainers.
4. Machine according to Claim 3, characterised in that in the pair of rolls (50, 51 the one roll (50) is drivable and the other roll (51) is constructed as an eccentrically arranged clamping roll.
5. Machine according to Claim 3 or 4, characterised in that the one roll (50) of the pair of rolls (50, 51) is driven via the main band drive (11).
6. Machine according to one of Claims 2 to 5, characterised in that, with respect to the drive wheel (40) of the main band drive (11) for band forwarding and the band return with the first greater speed, two electromagnetic clutches (27, 29) are arranged while for the band return with the second smaller speed and for the tensioning of the strapping band (5) a third electromagnetic clutch (52) is provided with a device for preadjustment of the tension of the strapping band.
7. Machine according to one of Claims 2 to 6, characterised in that two sensors (58, 59) for emitting a signal on a change in rotational speed in the band drives are provided of which the one sensor (59) is arranged on the main band drive (11) for determining the achieving of the adjusted tensioning of the strapping band (9) and the other sensor (58) on the auxiliary band drive (12) for determining the light lying against the package (8) of the strapping band (5).
8. Machine according to one of Claims 2 to 7, characterised in that, for the main and auxiliary band drives (11, 12), a capture magazine (16) is arranged between the auxiliary band drive and main band drive (11) and the connection station (10) for a reserve of band (15) formed on band return with the first higher speed, which is provided with a full condition indicator (17).
EP86103181A 1985-03-15 1986-03-10 Method and apparatus for strapping a package with a strapping band Expired - Lifetime EP0195345B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1180/85A CH668402A5 (en) 1985-03-15 1985-03-15 METHOD AND MACHINE FOR STRAPPING A PACKAGE WITH A STRAP.
CH1180/85 1985-03-15

Publications (3)

Publication Number Publication Date
EP0195345A2 EP0195345A2 (en) 1986-09-24
EP0195345A3 EP0195345A3 (en) 1987-11-11
EP0195345B1 true EP0195345B1 (en) 1990-09-26

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ID=4204365

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Application Number Title Priority Date Filing Date
EP86103181A Expired - Lifetime EP0195345B1 (en) 1985-03-15 1986-03-10 Method and apparatus for strapping a package with a strapping band

Country Status (6)

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US (1) US4691498A (en)
EP (1) EP0195345B1 (en)
JP (1) JPS61217316A (en)
CA (1) CA1262678A (en)
CH (1) CH668402A5 (en)
DE (2) DE8533188U1 (en)

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Also Published As

Publication number Publication date
JPS61217316A (en) 1986-09-26
DE3674439D1 (en) 1990-10-31
US4691498A (en) 1987-09-08
EP0195345A3 (en) 1987-11-11
EP0195345A2 (en) 1986-09-24
CA1262678A (en) 1989-11-07
CH668402A5 (en) 1988-12-30
DE8533188U1 (en) 1986-01-30

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