EP1364877B1 - Punching tool for a strapping device - Google Patents

Punching tool for a strapping device Download PDF

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Publication number
EP1364877B1
EP1364877B1 EP03405267A EP03405267A EP1364877B1 EP 1364877 B1 EP1364877 B1 EP 1364877B1 EP 03405267 A EP03405267 A EP 03405267A EP 03405267 A EP03405267 A EP 03405267A EP 1364877 B1 EP1364877 B1 EP 1364877B1
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EP
European Patent Office
Prior art keywords
recess
radius
width
band
die
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03405267A
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German (de)
French (fr)
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EP1364877A1 (en
Inventor
Flavio Finzo
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Signode Switzerland GmbH
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Orgapack GmbH
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Publication date
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Publication of EP1364877A1 publication Critical patent/EP1364877A1/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
    • B65B13/24—Securing ends of binding material
    • B65B13/30—Securing ends of binding material by deforming the overlapping ends of the strip or band
    • B65B13/305—Hand tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/14—Bale and package ties, hose clamps
    • Y10T24/1457—Metal bands
    • Y10T24/148—End-to-end integral band end connection

Definitions

  • the invention relates to a punching / forming tool for a strapping device for producing a tool-free connection of band ends of a strapping band having a recess with different width and in which in this case at least a portion of the wall bounding the recess in the region of at least one width change with a rounding is.
  • the invention also relates to a method for producing such a tool and the closure itself.
  • strapping equipment with which packaged a strained belt loop can be placed. This is done especially for packaging and transport purposes.
  • strapping tools with very different operating principles, in particular with respect to the connection of the two band ends.
  • the present invention relates to such strapping devices in which the belt loop is closed by forming and generating incisions. Between the two band ends a form fit is formed. In generic strapping the closure of two cooperating tools of the strapping device is also generated.
  • the one tool is fed from the side of one band and the other tool from the side of the other band on the tops of the two bands.
  • the two tools usually called punch and die, press the superimposed strip ends in a cavity of the die, whereby the forming takes place.
  • the recess of the die has its greatest extent in the direction of the band profile, wherein the width of the recess usually changes several times in the longitudinal direction of the recess.
  • the die thus has a complicated shape which is optimized with regard to the cuts to be achieved.
  • attempts are made to achieve as sharp edges and corners as possible in the wall, which should make it possible to hook the two ends of the strip particularly well.
  • From the DE-OS 19 05 145 It is also known to make the width change with a radius. This is intended to reduce the risk of injury from a strap closure.
  • the invention is therefore based on the object to enable a tight closure between the tape ends, in which the tools for producing the closure can be produced in the simplest and most cost-effective manner and also enable more uniform cutting forces. Nevertheless, the closure should also have good strength properties.
  • This object is achieved according to the invention in a device of the type mentioned in that the rounding substantially has a circular arc shape with a certain radius, and that a maximum width of the recess is equal to or smaller than six times, preferably four times, the value of the radius Wall.
  • the object is also achieved by a method as claimed in claim 7. An addressed in claim 11 closure is obtained accordingly.
  • one or more curves are provided in the range of width changes of the boundary wall of the recess. It has surprisingly been found in the context of the invention that such curves contribute to a uniform cutting force of the tool during the creation of a closure between two band ends. If a milling method is used to produce the recess, in which a cylindrical milling cutter is used, so radii can be generated in a particularly simple manner.
  • the milling method is particularly economical if, according to the invention, the at least one radius and certain mass of the recess are matched to one another.
  • the largest width of the recess can be made in a particularly economical manner with the same tool as the radius, unless the largest width of the recess is more than the value of three times, preferably twice, the diameter of the milling tool.
  • An economic production also contributes, if the smallest width is equal to or greater than the diameter of the milling tool and thus twice the value of the radius of the recess. This can be produced with at most two cutting paths, the smallest width of the recess.
  • width of the recess and “width change” can be understood as the direction which is oriented at least substantially parallel to the surfaces of the two band ends to be connected and perpendicular to the longitudinal direction of the band profile.
  • curves can be understood as those directions of curvature which are also substantially parallel to those planes which result through the surfaces of the two band ends to be joined.
  • the radius of the recess or the milling tool according to the invention should be selected from a range of 1 mm to 2.5 mm, preferably from a range of 1.3 mm to 2.0 mm.
  • the hand-operated strapping apparatus 1 shown in FIG. 1 is an example of generic strapping apparatus to which the invention is directed.
  • the strapping device has a base plate 2, with its preferably flat underside of the strapping device is placed on a packaged goods to be strapped.
  • a one-piece punch 3 is attached in the base plate 2.
  • a cooperating with the punch 3 one-piece die 4 is releasably secured in a die carrier 5.
  • the Matrizenlie 5 is pivotally articulated by means of a arranged at a front end of the base plate 2 pivot 6 (the pivot axis 8 is shown). With a pivot lever 7, the die carrier 5 can be pivoted about the pivot axis 8 in the direction of the base plate 2 and lifted from it again.
  • the pivot axis 8 is in this case substantially orthogonal to a band direction 9 aligned.
  • the two strap ends 10, 11 extend one above the other in the direction of the belt running direction 9, in order subsequently to join them together.
  • Stamp 3 and die 4 produce here by cuts and deformation a region shown in Fig. 2 20 in the two band ends 10, 11, which acts as a closure of the band ends 10, 11. This results in a generally known previously entanglement of the tape ends, in particular in the band direction. This permanently prevents unintentional loosening of the belt ends.
  • Fig. 3 an inventive die 4 and a matching punch 3 of a punching tool is shown.
  • Both the die and the punch have bores 23, 24, 25 on, which serve for fastening the two tool parts, inter alia, with screws 26, on the base plate 2 and the die carrier 5 of Fig. 1.
  • the die is provided with a recess 27 which is delimited by two walls 28.
  • the walls 28 have towards the punch 3 towards a wavy upper side 28a.
  • a contour of the wall surface 29 corresponds to an outer contour 30 of the punch 3. The latter can thus penetrate into the recess 27 of the die 4, in which case between the Stamp and the wall results in a small gap of substantially constant size.
  • the die 4 has an approximately cuboidal basic shape.
  • the groove-shaped recess 27 extends over the entire length of the die 4 and is open to the two end faces.
  • the recess 27 also extends parallel to the longitudinal extent of the die 4 and thus also parallel to the belt running direction 9.
  • the recess 27 has substantially identical sections 32, 33 with two different width ranges.
  • three sections 32 each having a width range B 1min equal to 3.2 mm to B 1max equal to 3.8 mm on the one hand and three sections having a constant width B 2 6 mm on the other hand are provided.
  • a section of the one width region B 1 is followed in each case by a section of the other width B 2 .
  • the sections 32, 33 are in tape running direction 9, which is also indicated in Fig. 4, substantially the same length.
  • the section with the smaller width region 32 in each case tapers from a width B 1max linearly to a width B 1min .
  • the two areas B 1 , B 2 are interconnected by crossing points 34, 35.
  • the wall surface, or tangents at the transition points 34, 35 has a larger angle a with the band running direction or an identical symmetry axis 36 of the recess.
  • the angle ⁇ may have an amount of 45 ° or more in the embodiment.
  • the transition points 34, 35 in this case run into the sections 33 with the larger of the two width ranges with a radius R 1 of 1.55 mm and a concave circular arc shape.
  • a concave arc with a radius R 2 of 1.55 mm directly adjoins the end of the sections 33 as part of the transition point 35.
  • the transitions to and from the sections 32 are also provided with a radius R 3 or R 4 .
  • These components of the transitions 34, 35 with a convex shape have a circular arc shape with a radius R 3 , R 4, also 1.55 mm each.
  • the punch 3 has a shape congruent with the recess 27 of the die and is a substantially negative image of the recess 27.
  • the punch 3 also has portions with two different widths, whereby the transitions to the larger Width are each provided with the same radii.
  • a milling cutter 38 with a radius of 1.55 mm which cuts at its circumference and at its front side is used.
  • the cutter 38 cut in FIG. 5 can be guided in two cutting paths 39, 40, in which the central axis of the milling cutter 38 is displaced parallel to the desired contour of the wall surface 29 to be produced. With these only two cutting paths 39, 40, the complete wall surface 29 can be produced.
  • An immersion depth The width of the milling cutter 38 corresponds to the height of the wall surface 29. Since both the width B 1max and B 1min of the narrower points of the recess and the width B 2 of the further points are at most equal to twice the diameter D of the milling cutter 38, the entire recess 27 are made alone with these two cutting paths.
  • the section with the greater width can also have a greatest width of more than twice the diameter of the milling cutter.
  • the maximum width should not exceed three times the diameter of the milling cutter 38, and thus six times the radius R 1 .
  • the remaining material in the recess can then be removed by a third cutting path in the belt running direction.
  • the third cutting path can pass through the already created sections with a smaller width range than idle cuts.
  • the punch can be produced from a block-shaped block in which the two longitudinal sides 30 of the punch are to be produced by means of the same cutter 38.
  • a closure produced with a punching tool according to the invention has a deformed area 20 provided with punching incisions.
  • this area 20 partial areas 32 ', 33' are present in the strip ends 10, 11, which are essentially an illustration of the sections 32, 33 of the punching tool.
  • the deformed / punched portions 32 ', 33' also widths B 1min ', B 1max ' and B 2 ', at least have approximately the same values as the respective corresponding widths B 1min , B 1max . and B 2 of the tool.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Package Frames And Binding Bands (AREA)

Abstract

The press for connecting the ends of banding strips has a receiver of different widths with at least one section which has the wall of the receiver recess defining a changing width rounded section to allow a reliable locking between the banding strip ends (10,11). The rounded section can have a circular form with a defined radius and the largest width (B2) of the recess is smaller than the sixth multiple of the radius. Claims include a stamping method for the banding strips ends.

Description

Die Erfindung betrifft ein Stanz-/Umformwerkzeug für ein Umreifungsgerät zur Erzeugung einer hilfsmittelfreien Verbindung von Bandenden eines Umreifungsbandes, das eine Ausnehmung mit unterschiedlicher Breite aufweist und in welchem hierbei zumindest ein Abschnitt der die Ausnehmung begrenzenden Wand im Bereich von zumindest einer Breitenänderung mit einer Rundung versehen ist. Die Erfindung betrifft zudem ein Verfahren zur Herstellung eines solchen Werkzeuges sowie den Verschluss selbst.The invention relates to a punching / forming tool for a strapping device for producing a tool-free connection of band ends of a strapping band having a recess with different width and in which in this case at least a portion of the wall bounding the recess in the region of at least one width change with a rounding is. The invention also relates to a method for producing such a tool and the closure itself.

Es sind seit langem Umreifungsgeräte bekannt, mit denen um Packgut eine gespannte Bandschlaufe gelegt werden kann. Dies erfolgt insbesondere zu Verpackungs- und Transportzwecken. Es sind in diesem Zusammenhang Umreifungsgeräte mit sehr unterschiedlichen Funktionsprinzipien bekannt geworden, insbesondere in Bezug auf die Verbindung der beiden Bandenden. Die vorliegende Erfindung betrifft solche Umreifungsgeräte, bei denen die Bandschlaufe durch Umformung und Erzeugung von Einschnitten verschlossen wird. Zwischen den beiden Bandenden wird hierbei ein Formschluss gebildet. Bei gattungsgemässen Umreifungsgeräten wird ferner der Verschluss von zwei zusammenwirkenden Werkzeugen des Umreifungsgerätes erzeugt.There are long known strapping equipment with which packaged a strained belt loop can be placed. This is done especially for packaging and transport purposes. There are known in this context strapping tools with very different operating principles, in particular with respect to the connection of the two band ends. The present invention relates to such strapping devices in which the belt loop is closed by forming and generating incisions. Between the two band ends a form fit is formed. In generic strapping the closure of two cooperating tools of the strapping device is also generated.

Das eine Werkzeug wird von der Seite des einen Bandes und das andere Werkzeug von der Seite des anderen Bandes auf die Oberseiten der beiden Bänder zugeführt. Die beiden Werkzeuge, üblicherweise Stempel und Matrize genannt, drücken die aufeinanderliegenden Bandenden in eine Kavität der Matrize, wodurch die Umformung erfolgt.The one tool is fed from the side of one band and the other tool from the side of the other band on the tops of the two bands. The two tools, usually called punch and die, press the superimposed strip ends in a cavity of the die, whereby the forming takes place.

Aus dem Stand der Technik ist es bekannt, dass die Ausnehmung der Matrize ihre grösste Erstreckung in Richtung des Bandverlaufs hat, wobei die Breite der Ausnehmung sich in Längsrichtung der Ausnehmung üblicherweise mehrfach ändert. Die Matrize hat somit eine komplizierte Form, die im Hinblick auf die zu erzielenden Einschnitte optimiert ist. In der Regel wird versucht, in der Wand möglichst scharfe Kanten und Ecken zu erzielen, die besonders gut ein Verhaken der beiden Bandenden ermöglichen soll. Aus der DE-OS 19 05 145 ist auch bekannt, die Breitenänderung mit einem Radius vorzunehmen. Hiermit soll die von einem Bandverschluss ausgehende Verletzungsgefahr vermindert werden.From the prior art, it is known that the recess of the die has its greatest extent in the direction of the band profile, wherein the width of the recess usually changes several times in the longitudinal direction of the recess. The die thus has a complicated shape which is optimized with regard to the cuts to be achieved. As a rule, attempts are made to achieve as sharp edges and corners as possible in the wall, which should make it possible to hook the two ends of the strip particularly well. From the DE-OS 19 05 145 It is also known to make the width change with a radius. This is intended to reduce the risk of injury from a strap closure.

Es hat sich jedoch gezeigt, dass gerade die bekannten Formen, die einen festen und dauerhaften Verschluss der Bandenden erzeugen, besonders schwierig zu fertigen sind. Üblicherweise wird die Ausnehmung der Matrize bisher durch Stossfertigungsverfahren erzeugt.However, it has been found that it is precisely the known shapes which produce a firm and permanent closure of the strip ends that are particularly difficult to manufacture. Usually, the recess of the die is previously produced by butting process.

Ein weiteres Problem, das sich bei derartigen Werkzeugen stellen kann, ist die oftmals auftretende ungleichmässige Schneidkraft. Variierende Schneidkräfte während eines Verschliessvorganges bedingen, dass ein Bediener des entsprechenden Umreifungsgerätes unterschiedlich grosse Kräfte aufbringen muss. Dies wird jedoch als unangenehm empfunden.Another problem that can arise with such tools is the often occurring uneven cutting force. Varying cutting forces during a closure process require that an operator of the corresponding strapping device must apply different forces. However, this is perceived as unpleasant.

Der Erfindung liegt deshalb die Aufgabe zu Grunde, einen festen Verschluss zwischen den Bandenden zu ermöglichen, bei dem die Werkzeuge zur Erzeugung des Verschlusses auf möglichst einfache und kostengünstige Weise hergestellt werden können und zudem gleichmässigere Schneidkräfte ermöglichen. Trotzdem soll der Verschluss auch gute Festigkeitseigenschaften aufweisen.The invention is therefore based on the object to enable a tight closure between the tape ends, in which the tools for producing the closure can be produced in the simplest and most cost-effective manner and also enable more uniform cutting forces. Nevertheless, the closure should also have good strength properties.

Diese Aufgabe wird bei einer Vorrichtung der eingangs genannten Art erfindungsgemäss dadurch gelöst, dass die Rundung im wesentlichen eine Kreisbogenform mit einem bestimmten Radius aufweist, und dass eine grösste Breite der Ausnehmung gleich oder kleiner ist als dem sechsfachen, vorzugsweise dem vierfachen, Wert des Radius der Wand. Die Aufgabe wird zudem durch ein Verfahren gelöst, wie es in Anspruch 7 angesprochen ist. Ein im Anspruch 11 angesprochener Verschluß ist dem entsprechend erhalten.This object is achieved according to the invention in a device of the type mentioned in that the rounding substantially has a circular arc shape with a certain radius, and that a maximum width of the recess is equal to or smaller than six times, preferably four times, the value of the radius Wall. The object is also achieved by a method as claimed in claim 7. An addressed in claim 11 closure is obtained accordingly.

Als eine erfindungsgemässe Massnahme sind somit im Bereich von Breitenänderungen der Begrenzungswand der Ausnehmung eine oder mehrere Rundungen vorgesehen. Es hat sich im Rahmen der Erfindung überraschenderweise gezeigt, dass derartige Rundungen zu einer gleichmässigen Schneidkraft des Werkzeuges während der Erzeugung eines Verschlusses zwischen zwei Bandenden beiträgt. Wird zur Erzeugung der Ausnehmung ein Fräsverfahren verwendet, bei dem ein zylindrischer Fräser benutzt wird, so können auf besonders einfache Weise Radien erzeugt werden.As an inventive measure thus one or more curves are provided in the range of width changes of the boundary wall of the recess. It has surprisingly been found in the context of the invention that such curves contribute to a uniform cutting force of the tool during the creation of a closure between two band ends. If a milling method is used to produce the recess, in which a cylindrical milling cutter is used, so radii can be generated in a particularly simple manner.

Das Fräsverfahren gestaltet sich besonders ökonomisch, wenn erfindungsgemäss der zumindest eine Radius und bestimmte Masse der Ausnehmung aufeinander abgestimmt sind. So kann die grösste Breite der Ausnehmung in besonders wirtschaftlicher Weise mit dem gleichen Werkzeug wie der Radius gefertigt werden, sofern die grösste Breite der Ausnehmung nicht mehr als den Wert des dreifachen, vorzugsweise des doppelten, Durchmessers des Fräswerkzeuges beträgt. Zu einer wirtschaftlichen Fertigung trägt auch bei, wenn die kleinste Breite gleich oder grösser dem Durchmesser des Fräswerkzeuges und damit dem doppelten Wert des Radius der Ausnehmung beträgt. Hiermit kann mit höchstens zwei Schnittwegen die kleinste Breite der Ausnehmung erzeugt werden.The milling method is particularly economical if, according to the invention, the at least one radius and certain mass of the recess are matched to one another. Thus, the largest width of the recess can be made in a particularly economical manner with the same tool as the radius, unless the largest width of the recess is more than the value of three times, preferably twice, the diameter of the milling tool. An economic production also contributes, if the smallest width is equal to or greater than the diameter of the milling tool and thus twice the value of the radius of the recess. This can be produced with at most two cutting paths, the smallest width of the recess.

Im Zusammenhang mit der Erfindung kann unter "Breite der Ausnehmung" sowie "Breitenänderung" jene Richtung verstanden werden, die zumindest im wesentlichen parallel zu den Oberflächen der beiden zu verbindenden Bandenden sowie senkrecht zur Längsrichtung des Bandverlaufs orientiert ist. Des Weiteren können unter "Rundungen" solche Krümmungsrichtungen verstanden werden, die ebenfalls im wesentlichen parallel zu jenen Ebenen verlaufen, die sich durch die Oberflächen der beiden zu verbindenden Bandenden ergeben.In the context of the invention, "width of the recess" and "width change" can be understood as the direction which is oriented at least substantially parallel to the surfaces of the two band ends to be connected and perpendicular to the longitudinal direction of the band profile. Furthermore, "curves" can be understood as those directions of curvature which are also substantially parallel to those planes which result through the surfaces of the two band ends to be joined.

Es hat sich gezeigt, dass der erfindungsgemässe Radius der Ausnehmung bzw. des Fräswerkzeuges aus einem Bereich von 1 mm bis 2,5 mm, vorzugsweise aus einem Bereich von 1,3 mm bis 2,0 mm gewählt sein sollte.It has been found that the radius of the recess or the milling tool according to the invention should be selected from a range of 1 mm to 2.5 mm, preferably from a range of 1.3 mm to 2.0 mm.

Weitere bevorzugte Ausgestaltungen der Erfindung ergeben sich aus den Ansprüchen und den Zeichnungen.Further preferred embodiments of the invention will become apparent from the claims and the drawings.

Die Erfindung wird anhand eines in den Figuren rein schematisch dargestellten Ausführungsbeispiels näher erläutert, es zeigen:

Fig. 1
ein gattungsgemässes Umreifungsgerät, in dem ein erfindungsgemässes Werkzeug zum Einsatz kommt;
Fig. 2
ein mit einem erfindungsgemässen Werkzeug erzeugter Verschluss;
Fig. 3
eine perspektivische Darstellung eines erfindungsgemässen Stempels und einer erfindungsgemässen Matrize;
Fig. 4
eine Draufsicht auf die erfindungsgemässe Matrize aus Fig. 3;
Fig. 5
ein Fräser in mehreren Positionen während eines Fertigungsprozesses der erfindungsgemässen Matrize gemäss Fig. 4;
Fig. 6
ein Fräser in mehreren Positionen während eines Fertigungsprozesses des erfindungsgemässen Stempels gemäss Fig. 3.
The invention will be explained in more detail with reference to an embodiment shown purely schematically in the figures, in which:
Fig. 1
a generic strapping apparatus in which a tool according to the invention is used;
Fig. 2
a closure produced with a tool according to the invention;
Fig. 3
a perspective view of a punch according to the invention and a die according to the invention;
Fig. 4
a plan view of the inventive die of Fig. 3;
Fig. 5
a milling cutter in several positions during a manufacturing process of the inventive die according to FIG. 4;
Fig. 6
a milling cutter in several positions during a manufacturing process of the stamp according to the invention according to FIG. 3.

Das in Fig. 1 gezeigte handbetätigte Umreifungsgerät 1 ist ein Beispiel für gattungsgemässe Umreifungsgeräte, an die sich die Erfindung richtet. Das Umreifungsgerät weist eine Grundplatte 2 auf, mit dessen vorzugsweise ebener Unterseite das Umreifungsgerät auf ein zu umreifendes Packgut gestellt wird. In der Grundplatte 2 ist ein einteiliger Stempel 3 befestigt. Eine mit dem Stempel 3 zusammenwirkende einteilige Matrize 4 ist in einem Matrizenträger 5 lösbar befestigt. Der Matrizenträger 5 ist mittels einem an einem vorderen Ende der Grundplatte 2 angeordneten Drehgelenk 6 (dessen Schwenkachse 8 dargestellt ist) schwenkbar angelenkt. Mit einem Schwenkhebel 7 kann der Matrizenträger 5 um die Schwenkachse 8 in Richtung auf die Grundplatte 2 geschwenkt und von ihr wieder abgehoben werden. Die Schwenkachse 8 ist hierbei im wesentlichen orthogonal zu einer Bandverlaufsrichtung 9 ausgerichtet. Zwischen der Grundplatte 2 und dem Matrizenträger 5 verlaufen bei der Erzeugung einer Umreifung die beiden Bandenden 10, 11 übereinanderliegend in Bandverlaufsrichtung 9, um sie dann anschliessend miteinander zu verbinden.The hand-operated strapping apparatus 1 shown in FIG. 1 is an example of generic strapping apparatus to which the invention is directed. The strapping device has a base plate 2, with its preferably flat underside of the strapping device is placed on a packaged goods to be strapped. In the base plate 2, a one-piece punch 3 is attached. A cooperating with the punch 3 one-piece die 4 is releasably secured in a die carrier 5. The Matrizenträger 5 is pivotally articulated by means of a arranged at a front end of the base plate 2 pivot 6 (the pivot axis 8 is shown). With a pivot lever 7, the die carrier 5 can be pivoted about the pivot axis 8 in the direction of the base plate 2 and lifted from it again. The pivot axis 8 is in this case substantially orthogonal to a band direction 9 aligned. Between the base plate 2 and the die carrier 5, in the production of a strapping, the two strap ends 10, 11 extend one above the other in the direction of the belt running direction 9, in order subsequently to join them together.

Beim Absenken dringt der Stempel 3 zusammen mit den beiden Bandlagen in eine nachfolgend noch näher erläuterte Ausnehmung der Matrize 4 ein, wodurch ein in Fig. 2 gezeigter Verschluss 15 von zwei Bandenden 10, 11 eines Stahlbandes gebildet wird. Hierbei nähert sich der eine Werkzeugteil den beiden Bandenden 10, 11 von oben, während der andere Werkzeugteil unter den beiden Bandenden 10, 11 ortsfest angeordnet ist. Da in der Regel bei derartigen Umreifungsgeräten der Schwenkradius relativ gross im Vergleich zur Grösse der Hubbewegung der Matrize ist, bewegt sich die Matrize 4 zumindest näherungsweise geradlinig auf den Stempel 3 zu. Vor diesem Verschlussvorgang ist mittels einem Spannhebel 18 (Fig. 1) ein in vielfacher Weise vorbekannten Spannmechanismus des Umreifungsgerätes 1 betätigt worden, wodurch wiederum eine um ein Packgut liegende Bandschlaufe gespannt wurde.When lowering the punch 3 penetrates together with the two band layers in a subsequently explained in more detail recess of the die 4, whereby a closure 15 shown in Fig. 2 of two band ends 10, 11 of a steel strip is formed. In this case, one tool part approaches the two belt ends 10, 11 from above, while the other tool part is arranged stationary under the two belt ends 10, 11. Since, in such strapping machines, the pivot radius is generally relatively large compared to the size of the stroke movement of the die, the die 4 moves at least approximately rectilinearly towards the die 3. Prior to this closing operation, a clamping mechanism of the strapping device 1, which is already known in many ways, has been actuated by means of a tension lever 18 (FIG. 1), which in turn has tensioned a belt loop around a packaged item.

Stempel 3 und Matrize 4 erzeugen hierbei durch Einschnitte und Verformung einen in Fig. 2 gezeigten Bereich 20 in den beiden Bandenden 10, 11, der als Verschluss der Bandenden 10, 11 wirkt. Hierdurch entsteht eine an sich grundsätzlich vorbekannte Verhakung der Bandenden, insbesondere in Bandverlaufsrichtung. Diese verhindert dauerhaft ein ungewolltes Lösen der Bandenden.Stamp 3 and die 4 produce here by cuts and deformation a region shown in Fig. 2 20 in the two band ends 10, 11, which acts as a closure of the band ends 10, 11. This results in a generally known previously entanglement of the tape ends, in particular in the band direction. This permanently prevents unintentional loosening of the belt ends.

In Fig. 3 ist eine erfindungsgemässe Matrize 4 und ein dazu passender Stempel 3 eines Stanzwerkzeuges gezeigt. Sowohl die Matrize als auch der Stempel weisen Bohrungen 23, 24, 25 auf, die zur Befestigung der beiden Werkzeugteile, u.a. mit Schrauben 26, an der Grundplatte 2 bzw. dem Matrizenträger 5 von Fig. 1 dienen. Die Matrize ist mit einer Ausnehmung 27 versehen, die von zwei Wänden 28 begrenzt wird. Die Wände 28 weisen zum Stempel 3 hin eine gewellte Oberseite 28a auf. Eine von den beiden Wänden 28 ausgebildete Wandfläche 29 begrenzt hierbei die Ausnehmung 27. Die Kontur bzw. der Verlauf der Wandfläche 29 entspricht hierbei einer Aussenkontur 30 des Stempels 3. Letzterer kann somit in die Ausnehmung 27 der Matrize 4 eindringen, wobei sich hierbei zwischen dem Stempel und der Wand ein kleiner Spalt mit im wesentlichen konstanter Grösse ergibt.In Fig. 3, an inventive die 4 and a matching punch 3 of a punching tool is shown. Both the die and the punch have bores 23, 24, 25 on, which serve for fastening the two tool parts, inter alia, with screws 26, on the base plate 2 and the die carrier 5 of Fig. 1. The die is provided with a recess 27 which is delimited by two walls 28. The walls 28 have towards the punch 3 towards a wavy upper side 28a. A contour of the wall surface 29 corresponds to an outer contour 30 of the punch 3. The latter can thus penetrate into the recess 27 of the die 4, in which case between the Stamp and the wall results in a small gap of substantially constant size.

Wie sowohl aus Fig. 3 als auch aus Fig. 4 hervorgeht, weist die Matrize 4 eine näherungsweise quaderförmige Grundform auf. Die nutenförmige Ausnehmung 27 verläuft über die gesamte Länge der Matrize 4 und ist zu deren beiden Stirnseiten hin jeweils offen. Die Ausnehmung 27 verläuft zudem parallel zur Längserstreckung der Matrize 4 und damit auch parallel zur Bandverlaufsrichtung 9. Die Ausnehmung 27 hat im wesentlichen identische Abschnitte 32, 33 mit zwei unterschiedlichen Breitenbereichen. Im Ausführungsbeispiel von Fig. 4 sind jeweils drei Abschnitte 32 mit einem Breitenbereich B1min gleich 3,2 mm bis B1max gleich 3,8 mm einerseits und drei Abschnitte mit einer konstanten Breite B2 6 mm andererseits vorgesehen. Auf einen Abschnitt des einen Breitenbereichs B1 folgt jeweils ein Abschnitt der anderen Breite B2. Diese Periodizität wiederholt sich drei Mal. Die Abschnitte 32, 33 sind in Bandverlaufsrichtung 9, die auch in Fig. 4 angedeutet ist, im wesentlichen gleich lang. Der Abschnitt mit dem kleineren Breitenbereich 32 verjüngt sich hierbei jeweils von einer Breite B1max linear zu einer Breite B1min.As can be seen both from FIG. 3 and from FIG. 4, the die 4 has an approximately cuboidal basic shape. The groove-shaped recess 27 extends over the entire length of the die 4 and is open to the two end faces. The recess 27 also extends parallel to the longitudinal extent of the die 4 and thus also parallel to the belt running direction 9. The recess 27 has substantially identical sections 32, 33 with two different width ranges. In the exemplary embodiment of FIG. 4, three sections 32 each having a width range B 1min equal to 3.2 mm to B 1max equal to 3.8 mm on the one hand and three sections having a constant width B 2 6 mm on the other hand are provided. A section of the one width region B 1 is followed in each case by a section of the other width B 2 . This periodicity is repeated three times. The sections 32, 33 are in tape running direction 9, which is also indicated in Fig. 4, substantially the same length. The section with the smaller width region 32 in each case tapers from a width B 1max linearly to a width B 1min .

Die beiden Bereiche B1, B2 sind durch Übergangsstellen 34, 35 miteinander verbunden. Im Unterschied zu den beiden Bereichen 32, 33 weist die Wandfläche, bzw. Tangenten an den Übergangsstellen 34, 35 einen grösseren Winkel a mit der Bandverlaufsrichtung bzw. einer hierzu identischen Symmetrieachse 36 der Ausnehmung auf. Der Winkel α kann im Ausführungsbeispiel einen Betrag von 45° oder mehr aufweisen. Die Übergangsstellen 34, 35 laufen hierbei in die Abschnitte 33 mit dem grösseren der beiden Breitenbereiche mit einem Radius R1 von 1,55 mm und einer konkaven Kreisbogenform hinein. Ebenso fügt sich unmittelbar an das Ende der Abschnitte 33, als Bestandteil der Übergangsstelle 35, ein konkaver Bogen mit einem Radius R2 von 1,55 mm an. Auch die Übergänge zu bzw. aus den Abschnitten 32 heraus sind mit einem Radius R3 bzw. R4 versehen. Diese Bestandteile der Übergänge 34, 35 mit konvexer Form haben eine Kreisbogenform mit einem Radius R3, R4 von ebenfalls jeweils 1,55 mm.The two areas B 1 , B 2 are interconnected by crossing points 34, 35. In contrast to the two areas 32, 33, the wall surface, or tangents at the transition points 34, 35 has a larger angle a with the band running direction or an identical symmetry axis 36 of the recess. The angle α may have an amount of 45 ° or more in the embodiment. The transition points 34, 35 in this case run into the sections 33 with the larger of the two width ranges with a radius R 1 of 1.55 mm and a concave circular arc shape. Likewise, a concave arc with a radius R 2 of 1.55 mm directly adjoins the end of the sections 33 as part of the transition point 35. The transitions to and from the sections 32 are also provided with a radius R 3 or R 4 . These components of the transitions 34, 35 with a convex shape have a circular arc shape with a radius R 3 , R 4, also 1.55 mm each.

Wie Fig. 3 entnommen werden kann, hat der Stempel 3 eine zur Ausnehmung 27 der Matrize kongruente Form und ist ein im wesentlichen negatives Abbild der Ausnehmung 27. Damit weist der Stempel 3 ebenso Abschnitte mit zwei unterschiedlichen Breiten auf, wobei auch die Übergänge zur grösseren Breite jeweils mit den gleichen Radien versehen sind.As can be seen in FIG. 3, the punch 3 has a shape congruent with the recess 27 of the die and is a substantially negative image of the recess 27. Thus, the punch 3 also has portions with two different widths, whereby the transitions to the larger Width are each provided with the same radii.

Zur Fertigung der in den Fig. 3 und 4 dargestellten erfindungsgemässen Matrize 4 wird ein an seinem Umfang und an seiner Stirnseite schneidender Fingerfräser 38 mit einem Radius von 1,55 mm verwendet. Der in Fig. 5 geschnitten dargestellte Fräser 38 kann in zwei Schnittwegen 39, 40 geführt werden, bei denen die Mittelachse des Fräsers 38 jeweils parallel zur Soll-Kontur der zu erzeugenden Wandfläche 29 verschoben wird. Mit diesen nur zwei Schnittwegen 39, 40 kann die vollständige Wandfläche 29 erzeugt werden. Eine Eintauchtiefe des Fräsers 38 entspricht hierbei der Höhe der Wandfläche 29. Da sowohl die Breite B1max und B1min der engeren Stellen der Ausnehmung als auch die Breite B2 der weiteren Stellen höchstens gleich dem doppelten Wert des Durchmessers D des Fräsers 38 betragen, kann auch die gesamte Ausnehmung 27 alleine mit diesen beiden Schnittwegen gefertigt werden.For the production of the die 4 according to the invention shown in FIGS. 3 and 4, a milling cutter 38 with a radius of 1.55 mm which cuts at its circumference and at its front side is used. The cutter 38 cut in FIG. 5 can be guided in two cutting paths 39, 40, in which the central axis of the milling cutter 38 is displaced parallel to the desired contour of the wall surface 29 to be produced. With these only two cutting paths 39, 40, the complete wall surface 29 can be produced. An immersion depth The width of the milling cutter 38 corresponds to the height of the wall surface 29. Since both the width B 1max and B 1min of the narrower points of the recess and the width B 2 of the further points are at most equal to twice the diameter D of the milling cutter 38, the entire recess 27 are made alone with these two cutting paths.

In einer nicht dargestellten, weiteren erfindungsgemässen Ausführungsform kann der Abschnitt mit der grösseren Breite auch eine grösste Breite von mehr als dem doppelten Wert des Durchmessers des Fräsers aufweisen. Die grösste Breite sollte jedoch höchstens dem dreifachen Wert des Durchmessers des Fräsers 38 und damit dem sechsfachen Wert des Radius R1 entsprechen. In diesem Fall kann das dann noch verbleibende Material in der Ausnehmung durch einen dritten Schnittweg in Bandverlaufsrichtung entfernt werden. Der dritte Schnittweg kann durch die bereits geschaffenen Abschnitte mit einem kleineren Breitenbereich als Leerschnitte hindurchführen.In a further embodiment of the invention which is not shown, the section with the greater width can also have a greatest width of more than twice the diameter of the milling cutter. However, the maximum width should not exceed three times the diameter of the milling cutter 38, and thus six times the radius R 1 . In this case, the remaining material in the recess can then be removed by a third cutting path in the belt running direction. The third cutting path can pass through the already created sections with a smaller width range than idle cuts.

Gemäss Fig. 6 kann der Stempel aus einem quaderförmigen Block gefertigt werden, bei dem mittels dem gleichen Fräser 38 die beiden Längsseiten 30 des Stempels zu erzeugen sind.According to FIG. 6, the punch can be produced from a block-shaped block in which the two longitudinal sides 30 of the punch are to be produced by means of the same cutter 38.

Fig. 2 kann entnommen werden, dass ein mit einem erfindungsgemässen Stanzwerkzeug erzeugter Verschluss einen umgeformten und mit Stanzeinschnitten versehenen Bereich 20 aufweist. In diesem Bereich 20 sind in den Bandenden 10, 11 Teilbereiche 32', 33' vorhanden, die im wesentlichen eine Abbildung der Abschnitte 32, 33 des Stanzwerkzeuges sind. Somit sind auch bei dem Verschluss einerseits an dessen gestanzten/umgeformten Aussenkanten Radien R1' - R4' vorhanden, die im wesentlichen den Radien R1 - R4 entsprechen. Andererseits weisen die umgeformten/gestanzten Teilbereiche 32', 33' auch Breiten B1min', B1max' sowie B2' auf, die zumindest näherungsweise die gleichen Werte haben wie die jeweils entsprechenden Breiten B1min, B1max. und B2 des Werkzeuges.It can be seen from FIG. 2 that a closure produced with a punching tool according to the invention has a deformed area 20 provided with punching incisions. In this area 20, partial areas 32 ', 33' are present in the strip ends 10, 11, which are essentially an illustration of the sections 32, 33 of the punching tool. Thus, even at the closure on the one hand at its punched / formed outer edges radii R 1 '- R 4 ' are present, which correspond substantially to the radii R 1 - R 4 . On the other hand, the deformed / punched portions 32 ', 33' also widths B 1min ', B 1max ' and B 2 ', at least have approximately the same values as the respective corresponding widths B 1min , B 1max . and B 2 of the tool.

Claims (11)

  1. Punching tool for a strapping unit for producing an auxiliary-free connection of ends of a strapping band, the tool having a recess of different widths, and, in the tool, at least one section of the recess-bounding wall being provided with a rounded portion in the region of at least one change in width, characterized in that the rounded portion is of circle-arc shape with a certain radius (R1, R2, R3, R4), and in that the largest width (B2) of the recess (27) is equal to or less than six times the radius (R1, R2, R3, R4) of the wall (28).
  2. Punching tool according to Claim 1, characterized in that the largest width (B2) of the recess (27) is equal to or less than four times the radius (R1, R2, R3, R4) of the wall (28).
  3. Punching tool according to Claim 1 or 2, characterized in that the smallest width (B1min) of the recess (27) is at least double the radius (R1, R2, R3, R4) of the wall (28).
  4. Punching tool according to one of the preceding claims, characterized in that the boundary wall (28) is symmetrical in relation to a longitudinally running axis (26) of the recess (27).
  5. Punching tool according to one of the preceding claims, characterized in that the radius (R1, R2, R3, R4) is selected from a range of from 1 mm to 2.5 mm.
  6. Punching tool according to one of the preceding claims, characterized by a recess (27) which is produced using a milling process.
  7. Process for producing a die of a strapping unit, by means of which it is possible to produce an auxiliary-free closure between ends of a strapping band, a recess being made in the die, characterized in that the recess (27) is produced by milling and its boundary wall (28) is provided with at least one rounded portion (R1, R2, R3, R4).
  8. Process according to Claim 7, characterized in that the smallest width (B1min) is produced in the recess (27) in a direction transverse to a longitudinal direction (9) of the recess (27), the smallest width (B1min) corresponding at least to double a radius (R1, R2, R3, R4) of the rounded portion.
  9. Process according to Claim 7 or 8, characterized in that the largest width (B2) is produced in the recess (27) in a direction transverse to a longitudinal direction (9) of the recess, the largest width corresponding at most to four times the radius (R1, R2, R3, R4) of the rounded portion.
  10. Process according to one of the preceding Claims 7 to 9, characterized in that a cylindrical milling cutter (38) is utilized in order to produce the rounded portion, a diameter (D) of the milling cutter (38) corresponding to the value of a radius (R1, R2, R3, R4) of the rounded portion of the boundary wall.
  11. Auxiliary-free closure of two band ends of a band strapping arrangement, the closure being produced by means of a punch and a die of a strapping unit by way of a punching/deforming operation and being formed as a punched/deformed region of the two band ends located one above the other, characterized by at least one deformed and/or punched sub-region of the region (20), with the largest width, in relation to a direction perpendicular to the band-running direction (9), being less than or equal to four times a radius (R1' - R4'), which the punched/deformed region has on one of its outer edges.
EP03405267A 2002-05-24 2003-04-16 Punching tool for a strapping device Expired - Lifetime EP1364877B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH20020870 2002-05-24
CH8702002 2002-05-24

Publications (2)

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EP1364877A1 EP1364877A1 (en) 2003-11-26
EP1364877B1 true EP1364877B1 (en) 2007-06-13

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US (1) US7128099B2 (en)
EP (1) EP1364877B1 (en)
CN (1) CN100445171C (en)
AT (1) ATE364553T1 (en)
DE (1) DE50307445D1 (en)
TW (1) TWI221439B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10259598A1 (en) * 2002-12-19 2004-07-01 Titan Umreifungstechnik Gmbh & Co Kg Closure of a strap
US11999516B2 (en) 2008-04-23 2024-06-04 Signode Industrial Group Llc Strapping device
US10518914B2 (en) 2008-04-23 2019-12-31 Signode Industrial Group Llc Strapping device
US9221567B2 (en) 2012-01-25 2015-12-29 Southern Bracing Systems Enterprises, Llc Systems, methods, and devices for tensioning straps
US9932135B2 (en) 2012-09-24 2018-04-03 Signode Industrial Group Llc Strapping device
US10308383B2 (en) * 2014-07-21 2019-06-04 Signode Industrial Group Llc Electrically powered combination hand-held strapping tool

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1606331A (en) * 1925-11-16 1926-11-09 Anderson Bert Bale tie
US1980154A (en) * 1932-09-28 1934-11-06 American Brass Co Means for connecting strips of sheet metal
DE1102643B (en) * 1954-11-06 1961-03-16 Lennart Reinhold Kalb Sleeveless strap closure
DE1225543B (en) * 1963-08-28 1966-09-22 Timmerbeil Erich Device for joining the ends of straps
US3327619A (en) * 1965-01-06 1967-06-27 Lennart Reinhold Kalb Strapping apparatus for packing straps
DE1905145C3 (en) 1969-02-03 1975-06-05 Titan Verpackungssysteme Gmbh, 5830 Schwelm Tape for strapping packages
DE1905142A1 (en) 1969-02-03 1970-09-24 Josef Merks Universal ice stick for summer and winter use
US3659318A (en) * 1970-11-24 1972-05-02 Titan Verpackungssysteme Gmbh Strapping tie
JPS6458615A (en) * 1987-08-26 1989-03-06 Sumitomo Metal Ind Engagement structure for bundling metal strap
DE3841489A1 (en) * 1988-12-09 1990-06-13 Hoesch Ag STRAP STRAPPING DEVICE
US5526852A (en) * 1994-06-13 1996-06-18 Rakovski; Zvonko Punching and stamping tool
CN2270019Y (en) * 1996-09-19 1997-12-10 湖南省工具厂 Portable steel tape bundling machine
US5694984A (en) * 1996-11-06 1997-12-09 Illinois Tool Works Inc. Strapping tool with improved punches

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US7128099B2 (en) 2006-10-31
CN1495098A (en) 2004-05-12
TWI221439B (en) 2004-10-01
DE50307445D1 (en) 2007-07-26
ATE364553T1 (en) 2007-07-15
TW200402355A (en) 2004-02-16
US20040007283A1 (en) 2004-01-15
EP1364877A1 (en) 2003-11-26
CN100445171C (en) 2008-12-24

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