EP1159197A1 - Device for tensioning and closing tightening straps - Google Patents

Device for tensioning and closing tightening straps

Info

Publication number
EP1159197A1
EP1159197A1 EP00902648A EP00902648A EP1159197A1 EP 1159197 A1 EP1159197 A1 EP 1159197A1 EP 00902648 A EP00902648 A EP 00902648A EP 00902648 A EP00902648 A EP 00902648A EP 1159197 A1 EP1159197 A1 EP 1159197A1
Authority
EP
European Patent Office
Prior art keywords
separating element
tensioning
pressure plate
tensioning wheel
band
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.)
Granted
Application number
EP00902648A
Other languages
German (de)
French (fr)
Other versions
EP1159197B1 (en
Inventor
Udo Reiche
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cyklop GmbH
Original Assignee
Cyklop GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cyklop GmbH filed Critical Cyklop GmbH
Publication of EP1159197A1 publication Critical patent/EP1159197A1/en
Application granted granted Critical
Publication of EP1159197B1 publication Critical patent/EP1159197B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • B65B13/02—Applying and securing binding material around articles or groups of articles, e.g. using strings, wires, strips, bands or tapes
    • B65B13/025—Hand-held tools
    • 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 device for tensioning and closing strapping tapes, in particular made of plastic, for Pac piece strapping, with a closing device for connecting the two strap ends of the strapping strap and with a tensioning device, which essentially consists of a drivable tensioning wheel, a positionable against the tensioning wheel or consists of this removable pressure plate and a self-adjusting separating element arranged between these two components, one end of the band being received between the tensioning wheel and the separating element and the other end of the band being received between the latter and the pressure plate.
  • Such devices are used to provide a package such as a packed pallet or a large box with strapping and so to hold together the goods stacked on the pallet or packed in the box and secure them for transport.
  • a firm band usually made of plastic
  • the band ends are then braced against one another with the aid of the device and connected to one another when the desired tension is reached.
  • the connection is made with the aid of the closing device, which generally consists of a friction welding device for plastic strips.
  • the strap ends are threaded into the tensioning device from the side, the strap end lying below being between the pressure plate and the separating element and the overlying second strap end lying between the separating element and the tensioning wheel.
  • the tensioning wheel which is usually provided with barbs on its circumferential surface or is roughened in some other way, is replaced by a suitable one Drive rotated and pulls the upper band end through the device into the closing device arranged behind the tensioning device, while the lower band end is clamped between the pressure plate and separating element.
  • the separating element is mounted in the tensioning device in a self-adjusting manner, that is, it can shift within certain limits during the tensioning process and thus assume an optimal position relative to the tensioning wheel, so that the frictional engagement required for tensioning between the tensioning wheel and the upper end of the band is caused by itself resulting, the best possible position of the separating element relative to the tensioning wheel is always guaranteed.
  • the strapping can be pretensioned with very high force and thus ensure a very tight strapping of the package, which is required in particular when transporting heavy packaged goods over longer distances.
  • the closing device is actuated, the two ends of the band being pressed firmly against one another by a pressure or friction plate before they are connected to one another.
  • the connection is usually carried out by friction welding, the friction plate moving the upper end of the band back and forth across the lower end of the band transversely to the longitudinal direction of the band, and the resulting frictional heat melts the ends of the band and thus welds them together.
  • the drive for the back and forth movement of the friction plate is stopped, but this is still held in its lowered position, which compresses the two ends of the band, in which it compresses the band ends under tension until the welded joint cools and thus its resilience.
  • the device After completion of the strapping in the manner described, the device must then be removed from the package or the strapping. This requires not just the Lift the pressure plate and the separating element far enough from the tensioning wheel in order to be able to thread the intermediate band ends laterally out of the device, but first the pressure or friction plate of the closing device must be lifted off the two band ends that are connected to each other, otherwise a lateral threading out of the band ends is not possible from the device.
  • the pressure or friction plate of the closing device is located after the two band ends have been connected or welded under not inconsiderable tension, which is exerted on them by the upper end of the band, which is biased towards the lower end of the band.
  • the Druck Inc. Friction plate is thus held by the upper band end under tension in the longitudinal direction of the device, which means that a lifting or lifting of the friction plate is only possible with great effort after connecting the band ends.
  • the closing device is manually opened (released) by means of a hand lever, the force required to lift the pressure plate was so great that the hand lever did not withstand the loads and broke off.
  • the tensioning device is therefore usually lifted first, i.e. the pressure plate and the separating element are lifted off the tensioning wheel with the aim that the two band ends running between these three components become disengaged from the tensioning wheel, separating element and Pressure plate arrive so that the upper end of the band is no longer under tension and thus the pressure or friction plate of the closing device is relieved.
  • the separating element which has been pushed under the tensioning wheel in the direction of the tip of the approximately wedge-shaped opening between the upper and lower band ends does not come out of engagement with the band ends, ie not completely , It ensures that they cannot jump off the toothed or barbed roughened surfaces of the tensioning wheel or the pressure plate.
  • the object of the invention is to avoid these disadvantages and to ensure a relaxation of the strapping ends lying laterally next to this after the establishment of a connection relative to one another even if only a limited ventilation path between the pressure plate and the tensioning wheel is available in the tensioning device.
  • an unlocking element displacing the separating element approximately parallel to the two belt ends when the pressure plate is lifted from its position relative to the tensioning roller or the pressure plate.
  • the separating element is forcibly displaced when the tensioning device is released and is displaced from its position which it assumed when the two band ends were tensioned against one another.
  • the displacement of the separating element parallel to the longitudinal direction of the strapping has the result that even with a comparatively small opening width between the tensioning wheel and the pressure plate, when the tensioning device is released between the tensioning wheel and the separating element on the one hand and this and the pressure plate on the other hand, sufficiently large gaps are formed and the strap ends from their frictional connection with the tensioning wheel or the pressure plate.
  • the unlocking element can essentially consist of a spring element acting on the separating element, which is under a spring preload and which, when the pressure plate is lifted, also pulls the separating element out of the wedge-shaped gap between the band ends away from the wedge gap tip or the weld seam between the band ends or presses.
  • An embodiment of the invention has proven to be particularly advantageous in which the unlocking element essentially consists of a disengagement wedge which interacts with a sliding surface of the separating element. When the pressure plate is lifted off, the sliding surface of the separating element comes to the bevel of the disengagement wedge and thereby automatically moves the separating element forward from the approximately wedge-shaped gap between the band ends when the tensioning device is released.
  • the separating element is advantageously arranged on a carrying shoe carrying the pressure plate, which shoe is moved transversely to the longitudinal direction of the strapping band when the tensioning device is released, thereby simultaneously lifting the pressure plate and the separating element from the tensioning roller.
  • the separating element is expediently designed as a separating plate with a curved surface adapted to the radius of the tensioning roller, as a result of which a secure hold of the upper band end between the tensioning wheel and the separating element is achieved during tensioning and correspondingly high tensioning forces can be achieved.
  • the pressure plate is preferably arranged fixed on the support shoe, while the separating element is movably mounted on the support shoe approximately parallel to the band ends. For this purpose, it can engage with a side fastening end in an elongated hole formed on the support shoe with play and in this through at least one with play a locking opening in the fastening end of the securing bolt must be secured.
  • the unlocking element is preferably adjustable by means of an adjusting device, the adjusting device, for example, essentially consisting of an adjusting screw with which the relative position of the disengagement wedge can be changed or the pretensioning of a spring element serving as an unlocking element can be changed.
  • Figure 1 shows an inventive device for tensioning and closing plastic strapping after welding the two strap ends in a side view and partially in section.
  • FIG. 2 shows the subject of FIG. 1 when the tensioning device is released in a representation corresponding to FIG. 1;
  • Fig. 3 shows a detail III of Fig. 2;
  • 10 denotes a device for tensioning and closing plastic strapping for the production of package strapping, which is used, for example, to secure the transport of packed pallets or the like. can serve.
  • the device has a closing device 11 and a tensioning device 12 located in front of it in the longitudinal direction of the belt, which essentially consists of a tensioning wheel 13, which can be driven with the aid of a pneumatic drive (not shown), one against the tensioning wheel can be set or lifted from this pressure plate 14 and a separating element 15 arranged between these two components, which is designed as a separating plate 16 and has a curved surface 17, the curvature of which is adapted to the radius r of the tensioning wheel.
  • the closing device essentially consists of a lower abutment plate 18 and a friction plate 19 which can be lowered in the housing above said plate and which can be moved back and forth by a suitable drive about a vertical axis in a manner not shown and described.
  • the two strap ends 20, 21 of the strapping strap 22 are inserted into the device from the side.
  • the friction plate 19 is in its raised position, in which it forms a sufficiently high gap 23 with the abutment plate 18 so that the two band ends 20, 21 lying one above the other can be inserted unhindered from the side between the friction plate and the abutment plate.
  • the pressure plate 14 and the separating element 15 are lifted off the tensioning wheel 13.
  • the pressure plate is arranged in one piece on a support shoe 24, which is lowered at its upper end via an eccentric gear 25 by an actuating lever 26 when the lever is pivoted forward, that is to say in the drawing counterclockwise to the left relative to the axis 27 of the tensioning wheel 13 and when the actuating lever 26 is pivoted in the opposite direction, that is to say in the clockwise direction, is raised again.
  • the pressure plate 14 arranged at the lower end of the support shoe 24 is moved approximately transversely to the direction of passage of the tape ends 20, 21 guided by the device.
  • the separating plate 16 is also arranged on the support shoe 24 and thus can be moved together with the pressure plate 14 approximately transversely to the direction 28 of the belt ends.
  • a slot-shaped opening 29 is provided in the support shoe 24 for receiving the separating plate 16, the length L of which is greater than the length 1 of the separating plate.
  • the partition plate is provided with a lateral extension, not recognizable in the drawing, which has an elongated hole through which a safety bolt 30, which projects transversely through the slot-shaped opening 29, is inserted.
  • the partition plate 16 can not fall out laterally from the slot-shaped opening 29, but is arranged in this with play and can both move parallel to the direction of passage 28 and pivot about an axis approximately parallel to the axis 27 of the tensioning wheel and thus in their relative position to Set the tensioning wheel largely freely.
  • the lower abutment plate 18 of the closing device 11 is provided on its front end face 31 with an unlocking element 32 for the separating plate 16, which essentially consists of a disengagement wedge 33, which by means of a threaded bore 34 on the end face 31 screwed screw 35 is attached to the abutment plate 18.
  • the arrangement is such that the oblique disengagement surface 36 of the disengagement wedge rises obliquely upwards from the wedge tip 37 lying approximately below the tensioning wheel axis 27 in the direction of passage 28 of the upper band end 20 to the closing device 11 behind it.
  • the oblique disengagement surface 36 interacts with the rear edge of the separating plate 16, which edge forms a sliding surface 38, as can best be seen in FIG. 3.
  • the pressure plate 14 and the separating plate 16 are lifted from the tensioning wheel 13 into a position by means of the actuating lever 26 displacing the support shoe 24, as can be seen in FIGS. 2 and 3.
  • the friction plate 19 at a distance from the underlying abutment plate 18 so that the tape ends can be easily inserted from the side of the device.
  • the actuating lever is then pivoted into the position shown in FIG. 1 and thereby lifts the support shoe 24, as a result of which the upper band end is clamped between the tensioning wheel 13 and the separating plate 16 underneath and the lower band end 21 is clamped between the latter and the pressure plate 14.
  • the (not shown) drive for the tensioning wheel 13 is switched on, which then rotates counterclockwise in the direction of arrow 40 and pushes the upper band end 20 further in the direction of passage 28 into the closing device, while at the same time clamping the lower band end between the pressure plate 14 and the separating element 15 is held.
  • the separating plate 16 also shifts in the direction of travel 28 due to its floating mounting on the support shoe 24 and reaches the position shown in FIG. 1, in which it lies approximately below the axis 27 of the tensioning wheel 13 and with its curved upper surface 17 with the interposition of the upper band end 20 lying flat against the tensioning wheel peripheral surface.
  • the upper end of the band lies over a relatively wide area on the outer circumference of the tensioning wheel, so that because of the great roughness of the tensioning wheel on its circumference and the large contact area, very great tensile forces are exerted on the band and this is put under high tension can.
  • the drive for the tensioning wheel switches off and the friction plate 19 is lowered in a known manner onto the upper band end 20 and moves it back and forth transversely to the direction of travel 28 at high speed over the lower band end 21, so that the two band ends melt and weld together, as indicated at 41.
  • the device 10 After the welding point 41 has hardened, the device 10 must be removed laterally from the finished strapping. For this it is necessary, on the one hand, to remove the friction plate 19 from the lift off the strip ends underneath to release the gap 23 and on the other hand also to vent the tensioning device 12 in the manner described. Due to the high tensile stress introduced into the band by the tensioning wheel 13, the friction plate 19 is held against the direction of travel 28 in the direction of the tensioning wheel after welding by the upper band end 20. This tensile force is so great that the friction plate can only be brought out of its illustrated position into the raised position again with the application of a very high force. In order to reduce the force for lifting the friction plate, the tensioning device is therefore first released, with the aim of disengaging the upper band end from the tensioning wheel and thereby reducing the forces exerted between the friction plate and the tensioning wheel by the upper band end.
  • 4b shows in a highly schematic simplification the arrangement of the individual components as they are arranged with respect to one another in the prior art. It can be clearly seen here that the separating plate 16 is lifted a little way from the tensioning wheel 13, but that the upper band end 20 is still in engagement with the tensioning wheel over an albeit smaller radian measure and is not released sufficiently far from the separating plate 16 to disengage from the rough surface of the tension wheel. The desired effect, namely the cancellation of the force acting on the friction plate 19 from the upper end of the belt, is therefore in accordance with an arrangement. 4b is not reached without the unlocking element 32.
  • the separating plate 16 is not only lifted radially from the tensioning wheel, but at the same time is also moved forward with the aid of the unlocking device 32 into the widening wedge-shaped gap 39 between the ends of the band, where it is the upper end of the band 20 not .longer presses against the tensioning wheel 13, so that that can detach from the U front surface of the tensioning wheel and thus causes relaxation of the friction plate 19.
  • the friction plate can then easily in a manner known per se with the help of a rocker arm gear, not shown, and an actuating this ßels 42 are raised and the gap 23 free.
  • a helical tension spring 43 is indicated as the unlocking element 32, which pulls the separating element 15 out of its effective engagement area below the tensioning wheel when the closing device 11 is released, when the wedge-shaped gap 39 is opened far enough around the separating plate by lifting the pressure plate 14 to release.

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

Abstract

The invention relates to a device for tensioning and closing plastic tightening straps, wherein one end (20) of the strap is guided between a tensioning wheel (13) and a self-adjusting separating element (15) and the other end (21) of the strap is guided between the separating element (15) and a pressure plate (14) that can be displaced in the direction of the tensioning wheel. In order to easily reopen the device after successfully tensioning and welding the ends of the strap with the purpose of removing said strap, an unblocking element (32) is assigned to the separating element (15) that displaces the separating element from its position relative to the tensioning wheel or the pressure plate almost parallel to both ends (20, 21) of the strap during lifting of the pressure plate (14) so that even after a minor ventilation or opening movement the separating element no longer presses the corresponding end (20) of the strap against the tensioning wheel thereby making it possible for said end of the strap to be disengaged from the tensioning wheel.

Description

Titel: Vorrichtung zum Spannen und Verschließen von UmreifungsbändernTitle: Device for tensioning and closing strapping
Die Erfindung betrifft eine Vorrichtung zum Spannen und Verschließen von Umreifungsbändern, insbesondere aus Kunststoff, für Pac stückumreifungen, mit einer Verschließeinrichtung zum Verbinden der beiden Bandenden des Umreifungsbandes sowie mit einer Spanneinrichtung, die im wesentlichen aus einem antreibbaren Spannrad, einer gegen das Spannrad anstellbaren bzw. von diesem abhebbaren Andruckplatte und einem zwischen diesen beiden Bauteilen angeordneten, selbsteinstellenden Trennelement besteht, wobei das eine Bandende zwischen dem Spannrad und dem Trennelement und das andere Bandende zwischen diesem und der Andruckplatte aufgenommen ist.The invention relates to a device for tensioning and closing strapping tapes, in particular made of plastic, for Pac piece strapping, with a closing device for connecting the two strap ends of the strapping strap and with a tensioning device, which essentially consists of a drivable tensioning wheel, a positionable against the tensioning wheel or consists of this removable pressure plate and a self-adjusting separating element arranged between these two components, one end of the band being received between the tensioning wheel and the separating element and the other end of the band being received between the latter and the pressure plate.
Derartige Vorrichtungen dienen dazu, ein Packstück wie z.B. eine bepackte Palette oder einen großen Karton mit einer Umreifung zu versehen und so die auf der Palette aufgestapelten bzw. in dem Karton verpackten Waren zusammenzuhalten und für den Transport zu sichern. Zur Herstellung der Umreifung wird ein festes Band, üblicherweise aus Kunststoff, um das Packstück gelegt und dann dessen Bandenden mit Hilfe der Vorrichtung gegeneinander verspannt und bei Erreichen der gewünschten Spannung miteinander verbunden. Die Verbindung erfolgt mit Hilfe der Verschließeinrichtung, die für Kunststoffbänder im allgemeinen aus einer Reibschweißeinrichtung besteht. Zum Spannen der Bandenden werden diese von der Seite her in die Spanneinrichtung eingefädelt, wobei das unten liegende Bandende zwischen der Andruckplatte und dem Trennelement und das darüberliegende zweite Bandende zwischen dem Trennelement und dem Spannrad liegt. Das Spannrad, das an seiner Umfangsfläche üblicherweise mit Widerhaken versehen oder in sonstiger Weise angerauht ist, wird von einem geeigneten Antrieb gedreht und zieht dabei das obere Bandende durch die Vorrichtung in die hinter der Spanneinrichtung angeordnete Verschließeinrichtung hinein, während das untere Bandende zwischen Andruckplatte und Trennelement eingeklemmt festgehalten wird. Das Trennelement ist in der Spanneinrichtung selbsteinstellend gelagert, d.h., es kann sich beim Spannvorgang innerhalb gewisser Grenzen verlagern und so eine optimale Lage relativ zum Spannrad einnehmen, so daß der für die Spannung erforderliche Reibschluß zwischen dem Spannrad und dem oberen Bandende durch die sich von selbst ergebende, bestmögliche Position des Trennelementes relativ zum Spannrad immer gewährleistet ist. Durch die selbsteinstellende, „fliegende Anordnung des Trennelementes, das gelegentlich auch als Hochspannkeil bezeichnet wird, kann das Umreifungsband mit sehr hoher Kraft vorgespannt werden und daduch eine sehr feste Umreifung des Packstückes gewährleisten, die insbesondere beim Transport von schweren Packgütern über längere Entfernungen gefordert wird.Such devices are used to provide a package such as a packed pallet or a large box with strapping and so to hold together the goods stacked on the pallet or packed in the box and secure them for transport. To produce the strapping, a firm band, usually made of plastic, is placed around the package and the band ends are then braced against one another with the aid of the device and connected to one another when the desired tension is reached. The connection is made with the aid of the closing device, which generally consists of a friction welding device for plastic strips. To tension the strap ends, they are threaded into the tensioning device from the side, the strap end lying below being between the pressure plate and the separating element and the overlying second strap end lying between the separating element and the tensioning wheel. The tensioning wheel, which is usually provided with barbs on its circumferential surface or is roughened in some other way, is replaced by a suitable one Drive rotated and pulls the upper band end through the device into the closing device arranged behind the tensioning device, while the lower band end is clamped between the pressure plate and separating element. The separating element is mounted in the tensioning device in a self-adjusting manner, that is, it can shift within certain limits during the tensioning process and thus assume an optimal position relative to the tensioning wheel, so that the frictional engagement required for tensioning between the tensioning wheel and the upper end of the band is caused by itself resulting, the best possible position of the separating element relative to the tensioning wheel is always guaranteed. Due to the self-adjusting, "flying arrangement of the separating element, which is sometimes also referred to as a high-tension wedge, the strapping can be pretensioned with very high force and thus ensure a very tight strapping of the package, which is required in particular when transporting heavy packaged goods over longer distances.
Nachdem die beiden Bandenden in der beschriebenen Weise mit der gewünschten Spannkraft gegeneinander verspannt sind, wird die Verschließeinrichtung betätigt, wobei die beiden Bandenden von einer Druck- bzw. Reibplatte fest aufeinander gepreßt werden, bevor sie miteinander verbunden werden. Bei Kunststoffbändern erfolgt die Verbindung wie erwähnt üblicherweise durch Reibschweißen, wobei die Reibplatte mit hoher Geschwindigkeit das obere Bandende über das untere Bandende quer zur Bandlängsrichtung hin- und herbewegt und die dabei entstehende Reibwärme die Bandenden an ihrer Oberfläche anschmilzt und so miteinander verschweißt. Anschließend wird der Antrieb für die Hin- und Herbewegung der Reibplatte stillgesetzt, diese jedoch weiter in ihrer abgesenkten, die beiden Bandenden zusammenpreßenden Position gehalten, in der sie die unter Zug stehenden Bandenden bis zum Erkalten der Schweißverbindung und damit deren Belastbarkeit zusammendrückt .After the two ends of the band are clamped against one another in the manner described with the desired clamping force, the closing device is actuated, the two ends of the band being pressed firmly against one another by a pressure or friction plate before they are connected to one another. In the case of plastic belts, the connection is usually carried out by friction welding, the friction plate moving the upper end of the band back and forth across the lower end of the band transversely to the longitudinal direction of the band, and the resulting frictional heat melts the ends of the band and thus welds them together. Then the drive for the back and forth movement of the friction plate is stopped, but this is still held in its lowered position, which compresses the two ends of the band, in which it compresses the band ends under tension until the welded joint cools and thus its resilience.
Nach Fertigstellung der Umreifung in der beschriebenen Weise muß anschließend die Vorrichtung vom Packstück bzw. dem Umreifungsband entfernt werden. Hierzu ist es erforderlich, nicht nur die Andruckplatte und das Trennelement weit genug vom Spannrad abzuheben, um die dazwischenliegenden Bandenden seitlich aus der Vorrichtung ausfädeln zu können, sondern vorab muß noch die Druck- bzw. Reibplatte der Verschließeinrichtung von den beiden miteinander verbundenen Bandenden abgehoben werden, da sonst ein seitliches Ausfädeln der Bandenden aus der Vorrichtung nicht möglich ist. Insbesondere bei Vorrichtungen, bei denen die U - reifungsbänder mit sehr hoher Vorspannkraft vorgespannt werden, beispielsweise bei Vorrichtungen, die einen hydraulischen oder pneumatischen Antrieb für das Spannrad aufweisen, steht nach dem Verbinden bzw. Verschweißen der beiden Bandenden die Druck- bzw. Reibplatte der Verschließeinrichtung unter nicht unerheblicher Zugspannung, die auf sie von dem oberen Bandende ausgeübt wird, das gegenüber dem unterem Bandende vorgespannt ist. Die Druckbzw. Reibplatte wird also von dem oberen Bandende unter Zug in Längsrichtung der Vorrichtung gehalten, was dazu führt, daß ein Lüften bzw. Anheben der Reibplatte nach dem Verbinden der Bandenden nur mit hohem Kraftaufwand möglich ist. Tatsächlich ist es bereits dazu gekommen, daß bei Vorrichtungen, bei denen die Verschließeinrichtung mittels eines Handhebels manuell geöffnet (gelüftet) wird, die zum Anheben der Andruckplatte erforderliche Kraft so groß war, daß der Handhebel den Belastungen nicht standhielt und abbrach.After completion of the strapping in the manner described, the device must then be removed from the package or the strapping. This requires not just the Lift the pressure plate and the separating element far enough from the tensioning wheel in order to be able to thread the intermediate band ends laterally out of the device, but first the pressure or friction plate of the closing device must be lifted off the two band ends that are connected to each other, otherwise a lateral threading out of the band ends is not possible from the device. Particularly in the case of devices in which the U-ripening bands are pretensioned with a very high pretensioning force, for example in devices which have a hydraulic or pneumatic drive for the tensioning wheel, the pressure or friction plate of the closing device is located after the two band ends have been connected or welded under not inconsiderable tension, which is exerted on them by the upper end of the band, which is biased towards the lower end of the band. The Druckbzw. Friction plate is thus held by the upper band end under tension in the longitudinal direction of the device, which means that a lifting or lifting of the friction plate is only possible with great effort after connecting the band ends. In fact, it has already happened that in devices in which the closing device is manually opened (released) by means of a hand lever, the force required to lift the pressure plate was so great that the hand lever did not withstand the loads and broke off.
Um das Öffnen oder Lüften der Verschließeinrichtung zu erleichtern, wird daher üblicherweise zuerst die Spanneinrichtung gelüftet, d.h. die Andruckplatte und das Trennelement von dem Spannrad ein Stück abgehoben mit dem Ziel, daß die beiden zwischen diesen drei Bauteilen verlaufenden Bandenden außer Eingriff mit Spannrad, Trennelement und Andruckplatte gelangen, so daß das obere Bandende nicht länger unter Spannung steht und dadurch auch die Druck- bzw. Reibplatte der Verschließeinrich-tung entlastet wird. Es hat sich aber gezeigt, daß insbesondere bei solchen Vorrichtungen, bei denen die Bandenden mit hoher Kraft gegeneinander verspannt werden, diese beim späteren Lüften der Spanneinrichtung nicht sicher außer Eingriff mit dem Spannrad und der Andruckplatte kommen, sondern weiterhin an deren rauhen oder gezahnten Oberfläche hängen bleiben und so ihre gegenseiti- ge Vorspannung beibehalten, so daß trotz vorherigen Lüftens der Spanneinrichtung die Druck- bzw. Reibplatte der Verschließeinrichtung weiterhin unter Zugspannung bleibt und entspechend schwer nur angehoben werden kann. Der Grund hierfür liegt darin, daß die Andruckplatte der Spanneinrichtung nur einen begrenzten Weg vom Spannrad abgehoben werden kann, da die gesamte Vorrichtung von der fertiggestellten Umreifung mit großer Kraft gegen das Packstück gedrückt wird. Da der Lüftungsweg der Spanneinrichtung somit beschränkt ist, kommt das Trennelement, das sich beim Spannen unter das Spannrad in Richtung auf die Spitze der etwa keilförmigen Öffnung zwischen dem oberen und unteren Bandende geschoben hat, nicht bzw. nicht vollständig außer Eingriff mit den Bandenden, d.h., es sorgt dafür, daß diese nicht von den zahn- oder widerhakenartig angerauhten Oberflächen des Spannrades bzw. der Andruckplatte abspringen können.In order to facilitate the opening or ventilation of the closing device, the tensioning device is therefore usually lifted first, i.e. the pressure plate and the separating element are lifted off the tensioning wheel with the aim that the two band ends running between these three components become disengaged from the tensioning wheel, separating element and Pressure plate arrive so that the upper end of the band is no longer under tension and thus the pressure or friction plate of the closing device is relieved. However, it has been shown that, in particular in the case of devices in which the band ends are braced against one another with high force, these do not come out of engagement with the tensioning wheel and the pressure plate when the tensioning device is later released, but continue to hang on the rough or toothed surface thereof stay and so their mutual Maintain ge bias so that, despite previous venting of the tensioning device, the pressure or friction plate of the closing device remains under tension and can only be raised with difficulty. The reason for this is that the pressure plate of the tensioning device can only be lifted a limited distance from the tensioning wheel, since the entire device is pressed against the package with great force by the finished strapping. Since the ventilation path of the tensioning device is thus limited, the separating element which has been pushed under the tensioning wheel in the direction of the tip of the approximately wedge-shaped opening between the upper and lower band ends does not come out of engagement with the band ends, ie not completely , It ensures that they cannot jump off the toothed or barbed roughened surfaces of the tensioning wheel or the pressure plate.
Aufgabe der Erfindung ist es, diese Nachteile zu vermeiden und ein Entspannen der nach dem Herstellen einer Verbindung seitlich neben dieser liegenden Umreifungsbandenden relativ zueinander auch dann zu gewährleisten, wenn nur ein begrenzter Lüftungsweg zwischen Andruckplatte und Spannrad in der Spanneinrichtung zur Verfügung steht.The object of the invention is to avoid these disadvantages and to ensure a relaxation of the strapping ends lying laterally next to this after the establishment of a connection relative to one another even if only a limited ventilation path between the pressure plate and the tensioning wheel is available in the tensioning device.
Diese Aufgabe wird mit der Erfindung durch ein das Trennelement beim Abheben der Andruckplatte aus seiner Relativlage zur Spannrolle bzw. zur Andruckplatte etwa parallel zu den beiden Bandenden verschiebendes Entsperrelement gelöst. Mit Hilfe eines solchen Entsperrelementes wird das Trennelement beim Lüften der Spanneinrichtung zwangsweise verschoben und aus seiner Lage verstellt, die es beim Spannen der beiden Bandenden gegeneinander eingenommen hat. Die Verschiebung des Trennelementes parallel zur Längsrichtung der Umreifung hat zur Folge, daß auch schon bei vergleichsweise geringer Öffnungsweite zwischen Spannrad und Andruckplatte beim Lüften der Spanneinrichtung zwischen Spannrad und Trennelement einerseits und diesem und der Andruckplatte andererseits ausreichend große Spalte enstehen und die Bandenden aus ihrer reibschlüssigen Verbindung mit dem Spannrad bzw. der Andruckplatte gelangen. In besonders vorteilhafter Weise ist da- bei das Trennelement von dem Entsperrelement in dem sich beim Abheben der Andruckplatte ausbildenden, etwa keilförmigen Spalt zwischen den Bandenden in einer von der Keilspaltspitze bzw. der Verbindungsstelle der Bandenden weg weisenden Richtung verschiebbar, also in einen Bereich, in dem die Bandenden einen größeren Abstand voneinander halten.This object is achieved with the invention by an unlocking element displacing the separating element approximately parallel to the two belt ends when the pressure plate is lifted from its position relative to the tensioning roller or the pressure plate. With the aid of such an unlocking element, the separating element is forcibly displaced when the tensioning device is released and is displaced from its position which it assumed when the two band ends were tensioned against one another. The displacement of the separating element parallel to the longitudinal direction of the strapping has the result that even with a comparatively small opening width between the tensioning wheel and the pressure plate, when the tensioning device is released between the tensioning wheel and the separating element on the one hand and this and the pressure plate on the other hand, sufficiently large gaps are formed and the strap ends from their frictional connection with the tensioning wheel or the pressure plate. In a particularly advantageous manner, in the case of the separating element from the unlocking element in the approximately wedge-shaped gap between the band ends which forms when the pressure plate is lifted off, in a direction pointing away from the wedge gap tip or the connecting point of the band ends, that is to say in an area in which the band ends are at a greater distance from one another hold.
Das Entsperrelement kann im wesentlichen aus einem am Trennelement angreifenden Federelement bestehen, das unter einer Federvorspannung steht und das auch als Hochhaltekeil bezeichnete Trennelement beim Lüften der Andruckplatte aus dem keilförmigen Spalt zwischen den Bandenden weg von der Keilspaltspitze bzw. der Schweißnaht zwischen den Bandenden zieht bzw. drückt. Als ganz besonders vorteilhaft hat sich eine Ausgestaltung der Erfindung bewährt, bei der das Entsperrelement im wesentlichen aus einem mit einer Gleitfläche des Trennelements zusammenwirkenden Ausrückkeil besteht. Beim Abheben der Andruckplatte gelangt die Gleitfläche des Trennelementes an die Schräge des Ausrückkeils und verschiebt dadurch das Trennelement automatisch nach vorne aus dem etwa keilförmigen Spalt zwischen den Bandenden, wenn die Spanneinrichtung gelüftet wird. In vorteilhafter Weise ist hierbei das Trennelement an einem die Andruckplatte tragenden Tragschuh angeordnet, der beim Lüften der Spanneinrichtung quer zur Längsrichtung des Umreifungsbandes bewegt wird und dadurch die Andruckplatte und das Trennelement gleichzeitig von der Spannrolle abhebt.The unlocking element can essentially consist of a spring element acting on the separating element, which is under a spring preload and which, when the pressure plate is lifted, also pulls the separating element out of the wedge-shaped gap between the band ends away from the wedge gap tip or the weld seam between the band ends or presses. An embodiment of the invention has proven to be particularly advantageous in which the unlocking element essentially consists of a disengagement wedge which interacts with a sliding surface of the separating element. When the pressure plate is lifted off, the sliding surface of the separating element comes to the bevel of the disengagement wedge and thereby automatically moves the separating element forward from the approximately wedge-shaped gap between the band ends when the tensioning device is released. In this case, the separating element is advantageously arranged on a carrying shoe carrying the pressure plate, which shoe is moved transversely to the longitudinal direction of the strapping band when the tensioning device is released, thereby simultaneously lifting the pressure plate and the separating element from the tensioning roller.
Das Trennelement ist zweckmäßig als Trennplatte mit einer an den Radius der Spannrolle angepaßten, gekrümmten Oberfläche ausgestaltet, wodurch beim Spannen ein sicherer Halt des oberen Bandendes zwischen Spannrad und Trennelement bewirkt wird und entsprechend hohe Spannkräfte erreichbar sind. Die Andruckplatte ist vorzugsweise fest an dem Tragschuh angeordnet, während das Trennelement etwa parallel zu den Bandenden beweglich am Tragschuh gelagert ist. Hierzu kann es mit einem seitlichen Befestigungsende in ein am Tragschuh ausgebildetes Langloch mit Spiel einfassen und in diesem durch mindestens einen mit Spiel durch eine Arretieröffnung im Befestigungsende fassenden Sicherungsbolzen gesichert sein.The separating element is expediently designed as a separating plate with a curved surface adapted to the radius of the tensioning roller, as a result of which a secure hold of the upper band end between the tensioning wheel and the separating element is achieved during tensioning and correspondingly high tensioning forces can be achieved. The pressure plate is preferably arranged fixed on the support shoe, while the separating element is movably mounted on the support shoe approximately parallel to the band ends. For this purpose, it can engage with a side fastening end in an elongated hole formed on the support shoe with play and in this through at least one with play a locking opening in the fastening end of the securing bolt must be secured.
Das Entsperrelement ist vorzugsweise mittels einer EinStelleinrichtung einstellbar, wobei die Einsteileinrichtung beispielsweise im wesentlichen aus einer Stellschraube bestehen kann, mit der die relative Lage des Ausrückkeils verändert oder auch die Vorspannung eines als Entsperrelement dienenden Federelementes verändert werden kann. Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung und den Zeichnungen, worin eine bevorzugte Ausführungsform der Erfindung an einem Beispiel näher erläutert ist. Es zeigt:The unlocking element is preferably adjustable by means of an adjusting device, the adjusting device, for example, essentially consisting of an adjusting screw with which the relative position of the disengagement wedge can be changed or the pretensioning of a spring element serving as an unlocking element can be changed. Further features and advantages of the invention will become apparent from the following description and the drawings, in which a preferred embodiment of the invention is explained in more detail using an example. It shows:
Fig. 1 eine erfindungsgemäße Vorrichtung zum Spannen und Verschließen von Kunststoff-Umreifungsbändern nach erfolgter Verschweißung der beiden Bandenden in einer Seitenansicht und teilweise im Schnitt;Figure 1 shows an inventive device for tensioning and closing plastic strapping after welding the two strap ends in a side view and partially in section.
Fig. 2 den Gegenstand der Fig. 1 beim Lüften der Spanneinrichtung in einer Fig. 1 entsprechenden Darstellung;FIG. 2 shows the subject of FIG. 1 when the tensioning device is released in a representation corresponding to FIG. 1;
Fig. 3 eine Einzelheit III der Fig. 2; undFig. 3 shows a detail III of Fig. 2; and
Fig. 4a und b Prinzipschaubilder zur Veranschaulichung der Wirkungsweise der Erfindung im Vergleich zum Stand der Technik.4a and b schematic diagrams to illustrate the operation of the invention compared to the prior art.
In der Zeichnung bezeichnet 10 eine Vorrichtung zum Spannen und Verschließen von Kunststoff-Umreifungsbändern zur Herstellung von Packstückumreifungen, die beispielsweise zur Transportsicherung von bepackten Paletten od.dgl. dienen können.In the drawing, 10 denotes a device for tensioning and closing plastic strapping for the production of package strapping, which is used, for example, to secure the transport of packed pallets or the like. can serve.
Die Vorrichtung weist eine Verschließeinrichtung 11 sowie eine in Bandlängsrichtung davorliegende Spanneinrichtung 12 auf, die im wesentlichen aus einem mit Hilfe eines nicht näher dargestellten Pneumatikantriebs antreibbaren Spannrad 13, einer gegen das Spannrad anstellbaren bzw. von diesem abhebbaren Andruckplatte 14 sowie einem zwischen diesen beiden Bauteilen angeordneten Trennelement 15 besteht, das als Trennplatte 16 ausgestaltet ist und eine gekrümmte Oberfläche 17 aufweist, deren Krümmung an den Radius r des Spannrades angepaßt ist.The device has a closing device 11 and a tensioning device 12 located in front of it in the longitudinal direction of the belt, which essentially consists of a tensioning wheel 13, which can be driven with the aid of a pneumatic drive (not shown), one against the tensioning wheel can be set or lifted from this pressure plate 14 and a separating element 15 arranged between these two components, which is designed as a separating plate 16 and has a curved surface 17, the curvature of which is adapted to the radius r of the tensioning wheel.
Die Verschließeinrichtung besteht in an sich bekannter Weise im wesentlichen aus einer unteren Widerlagerplatte 18 und einer oberhalb dieser absenkbar im Gehäuse angeordneten Reibplatte 19, die von einem geeigneten Antrieb um eine vertikale Achse in nicht näher dargestellter und beschriebener Weise hin- und herbewegt werden kann.In a manner known per se, the closing device essentially consists of a lower abutment plate 18 and a friction plate 19 which can be lowered in the housing above said plate and which can be moved back and forth by a suitable drive about a vertical axis in a manner not shown and described.
Zum Herstellen einer Umreifung werden die beiden Bandenden 20, 21 des Umreifungsbandes 22 von der Seite in die Vorrichtung eingelegt. Dabei befindet sich die Reibplatte 19 in ihrer angehobenen Position, in der sie mit der Widerlagerplatte 18 einen ausreichend hohen Spalt 23 bildet, so daß die beiden übereinander- liegenden Bandenden 20, 21 ungehindert von der Seite zwischen Reibplatte und Widerlagerplatte eingeschoben werden können. Zum Einfädeln der Bandenden in die Spanneinrichtung 12 sind die Andruckplatte 14 und das Trennelement 15 von dem Spannrad 13 abgehoben. Die Andruckplatte ist hierzu einstückig an einem Tragschuh 24 angeordnet, der an seinem oberen Ende über ein Exzentergetriebe 25 von einem Betätigungshebel 26 bei Verschwenken des Hebels nach vorn, also in der Zeichnung entgegen dem Uhrzeigersinn nach links relativ zur Achse 27 des Spannrades 13 abgesenkt wird und bei Verschwenken des Betätigungshebels 26 in Gegenrichtung, also im Uhrzeigersinne, wieder angehoben wird. Die am unteren Ende des Tragschuhs 24 angeordnete Andruckplatte 14 wird dabei etwa quer zur Durchlaufrichtung der durch die Vorrichtung geführten Bandenden 20, 21 bewegt.To produce a strapping, the two strap ends 20, 21 of the strapping strap 22 are inserted into the device from the side. The friction plate 19 is in its raised position, in which it forms a sufficiently high gap 23 with the abutment plate 18 so that the two band ends 20, 21 lying one above the other can be inserted unhindered from the side between the friction plate and the abutment plate. To thread the tape ends into the tensioning device 12, the pressure plate 14 and the separating element 15 are lifted off the tensioning wheel 13. For this purpose, the pressure plate is arranged in one piece on a support shoe 24, which is lowered at its upper end via an eccentric gear 25 by an actuating lever 26 when the lever is pivoted forward, that is to say in the drawing counterclockwise to the left relative to the axis 27 of the tensioning wheel 13 and when the actuating lever 26 is pivoted in the opposite direction, that is to say in the clockwise direction, is raised again. The pressure plate 14 arranged at the lower end of the support shoe 24 is moved approximately transversely to the direction of passage of the tape ends 20, 21 guided by the device.
Auch die Trennplatte 16 ist an dem Tragschuh 24 angeordnet und somit gemeinsam mit der Andruckplatte 14 etwa quer zur Durchlaufrichtung 28 der Bandenden beweglich. Zur Aufnahme der Trennplatte 16 ist im Tragschuh 24 eine schlitzförmige Öffnung 29 vorgesehen, deren Länge L größer ist als die Länge 1 der Trenn- platte. Die Trennplatte ist mit einem seitlichen, in der Zeichnung nicht erkennbaren Fortsatz versehen, der ein Langloch hat, durch das ein quer durch die schlitzförmige Öffnung 29 ragender Sicherungsbolzen 30 hindurchgesteckt ist. Die Trennplatte 16 kann dadurch nicht seitlich aus der schlitzförmigen Öffnung 29 herausfallen, ist in dieser jedoch mit Spiel angeordnet und kann sich sowohl parallel zur Durchlaufrichtung 28 verschieben als auch um eine Achse etwa parallel zur Achse 27 des Spannrades verschwenken und sich somit in ihrer Relativlage zum Spannrad weitgehend frei einstellen.The separating plate 16 is also arranged on the support shoe 24 and thus can be moved together with the pressure plate 14 approximately transversely to the direction 28 of the belt ends. A slot-shaped opening 29 is provided in the support shoe 24 for receiving the separating plate 16, the length L of which is greater than the length 1 of the separating plate. The partition plate is provided with a lateral extension, not recognizable in the drawing, which has an elongated hole through which a safety bolt 30, which projects transversely through the slot-shaped opening 29, is inserted. The partition plate 16 can not fall out laterally from the slot-shaped opening 29, but is arranged in this with play and can both move parallel to the direction of passage 28 and pivot about an axis approximately parallel to the axis 27 of the tensioning wheel and thus in their relative position to Set the tensioning wheel largely freely.
Wie sich aus den Fig. 1 bis 3 ergibt, ist die untere Widerlagerplatte 18 der Verschließeinrichtung 11 an ihrer vorderen Stirnseite 31 mit einem Entsperrelement 32 für die Trennplatte 16 versehen, das im wesentlichen aus einem Ausrückkeil 33 besteht, der mittels einer in eine Gewindebohrung 34 an der Stirnseite 31 eingeschraubten Stellschraube 35 an der Widerlagerplatte 18 befestigt ist. Dabei ist die Anordnung so getroffen, daß die schräge Ausrückfläche 36 des Ausrückkeils ausgehend von der etwa unterhalb der Spannradachse 27 liegenden Keilspitze 37 schräg nach oben in Durchlaufrichtung 28 des oberen Bandendes 20 zur dahinterliegenden Verschließeinrichtung 11 hin ansteigt. Die schräge Ausrückfläche 36 wirkt mit der hinteren, eine Gleitfläche 38 bildenden Kante der Trennplatte 16 zusammen, wie dies am besten in Fig. 3 erkennbar ist. Dies hat zur Folge, daß die Trennplatte beim Lüften der Spanneinrichtung von dem dann nach unten bewegten Tragschuh 24 nicht nur radial von dem Spannrad 13 abgehoben wird, wie dies beim Stand der Technik gem. Fig. 4b üblich ist, sondern zusätzlich von dem Ausrückkeil etwa in Tangen- tialrichtung des Spannrades nach vorne aus dem von den beiden Bandenden 20, 21 gebildeten keilförmigen Spalt 39 entgegen der Durchlaufrichtung 28 des oberen Bandendes 20 ausgerückt wird.1 to 3, the lower abutment plate 18 of the closing device 11 is provided on its front end face 31 with an unlocking element 32 for the separating plate 16, which essentially consists of a disengagement wedge 33, which by means of a threaded bore 34 on the end face 31 screwed screw 35 is attached to the abutment plate 18. The arrangement is such that the oblique disengagement surface 36 of the disengagement wedge rises obliquely upwards from the wedge tip 37 lying approximately below the tensioning wheel axis 27 in the direction of passage 28 of the upper band end 20 to the closing device 11 behind it. The oblique disengagement surface 36 interacts with the rear edge of the separating plate 16, which edge forms a sliding surface 38, as can best be seen in FIG. 3. This has the consequence that the separating plate is not only lifted radially from the tensioning wheel 13 when the tensioning device is lifted from the support shoe 24 which is then moved downward, as is the case in the prior art. 4b is customary, but is additionally disengaged from the disengaging wedge approximately in the tangential direction of the tensioning wheel from the wedge-shaped gap 39 formed by the two band ends 20, 21 against the direction of travel 28 of the upper band end 20.
Zum Einlegen der Bandenden 20, 21 bei Herstellung einer Umreifung werden die Andruckplatte 14 und die Trennplatte 16 mit Hilfe des den Tragschuh 24 verschiebenden Betätigungshebels 26 von dem Spannrad 13 in eine Position abgehoben, wie sie in den Fig. 2 und 3 erkennbar ist. Dabei befindet sich - wie erwähnt - auch die Reibplatte 19 im Abstand von der darunterliegenden Widerlagerplatte 18, so daß die Bandenden leicht von der Seite der Vorrichtung eingelegt werden können. Anschließend wird der Betätigungshebel in die in Fig. 1 dargestellte Position verschwenkt und hebt dadurch den Tragschuh 24 an, wodurch das obere Bandende zwischen dem Spannrad 13 und der darunterliegenden Trennplatte 16 und das untere Bandende 21 zwischen diesem und der Andruckplatte 14 eingeklemmt werden. Anschließend wird der (nicht dargestellte) Antrieb für das Spannrad 13 eingeschaltet, das sich dann entgegen dem Uhrzeigersinn in Richtung des Pfeiles 40 dreht und das obere Bandende 20 weiter in Durchlaufrichtung 28 in die Verschließeinrichtung hineinschiebt, während gleichzeitig das untere Bandende durch Klemmung zwischen der Andruckplatte 14 und dem Trennelement 15 festgehalten wird. Bei diesem Spannvorgang verschiebt sich auch die Trennplatte 16 infolge ihrer schwimmenden Lagerung an dem Tragschuh 24 in Durchlaufrichtung 28 und gelangt in die in Fig. 1 dargestellte Position, in der sie etwa unterhalb der Achse 27 des Spannrades 13 liegt und mit ihrer gewölbten oberen Oberfläche 17 unter Zwischenlage des oberen Bandendes 20 flächig an der Spannradumfangsfläche anliegt. Wie gut erkennbar ist, liegt dadurch das obere Bandende über einen verhältnismäßig weiten Bereich am Außenumfang des Spannrades an, so daß wegen der großen Rauhigkeit des Spannrades an seinem Umfang und der großen Kontaktfläche sehr große Zugkräfte auf das Band ausgeübt und dieses unter hohe Spannung gesetzt werden kann.To insert the strap ends 20, 21 when producing a strapping, the pressure plate 14 and the separating plate 16 are lifted from the tensioning wheel 13 into a position by means of the actuating lever 26 displacing the support shoe 24, as can be seen in FIGS. 2 and 3. As mentioned, there is also the friction plate 19 at a distance from the underlying abutment plate 18 so that the tape ends can be easily inserted from the side of the device. The actuating lever is then pivoted into the position shown in FIG. 1 and thereby lifts the support shoe 24, as a result of which the upper band end is clamped between the tensioning wheel 13 and the separating plate 16 underneath and the lower band end 21 is clamped between the latter and the pressure plate 14. Then the (not shown) drive for the tensioning wheel 13 is switched on, which then rotates counterclockwise in the direction of arrow 40 and pushes the upper band end 20 further in the direction of passage 28 into the closing device, while at the same time clamping the lower band end between the pressure plate 14 and the separating element 15 is held. During this tensioning operation, the separating plate 16 also shifts in the direction of travel 28 due to its floating mounting on the support shoe 24 and reaches the position shown in FIG. 1, in which it lies approximately below the axis 27 of the tensioning wheel 13 and with its curved upper surface 17 with the interposition of the upper band end 20 lying flat against the tensioning wheel peripheral surface. As can be clearly seen, the upper end of the band lies over a relatively wide area on the outer circumference of the tensioning wheel, so that because of the great roughness of the tensioning wheel on its circumference and the large contact area, very great tensile forces are exerted on the band and this is put under high tension can.
Bei Erreichen der gewünschten Zugspannung schaltet der Antrieb für das Spannrad ab und die Reibplatte 19 wird in bekannter Weise auf das obere Bandende 20 abgesenkt und bewegt dieses quer zur Durchlaufrichtung 28 mit hoher Geschwindigkeit über das untere Bandende 21 hin und her, so daß die beiden Bandenden anschmelzen und miteinander verschweißen, wie dies bei 41 angedeutet ist.When the desired tension is reached, the drive for the tensioning wheel switches off and the friction plate 19 is lowered in a known manner onto the upper band end 20 and moves it back and forth transversely to the direction of travel 28 at high speed over the lower band end 21, so that the two band ends melt and weld together, as indicated at 41.
Nach dem Aushärten der Schweißstelle 41 muß die Vorrichtung 10 seitlich von der fertiggestellten Umreifung entnommen werden. Hierzu ist es erforderlich, einerseits die Reibplatte 19 von den darunterliegenden Bandenden abzuheben, um den Spalt 23 wieder freizugeben und andererseits auch die Spanneinrichtung 12 in der beschriebenen Weise zu lüften. Aufgrund der hohen, von dem Spannrad 13 in das Band eingebrachten Zugspannung wird die Reibplatte 19 nach dem Verschweißen von dem oberen Bandende 20 entgegen der Durchlaufrichtung 28 in Richtung auf das Spannrad gezogen gehalten. Diese Zugkraft ist so groß, daß die Reibplatte nur unter Aufwendung einer sehr hohen Kraft wieder aus ihrer dargestellten in die angehobene Position gebracht werden kann. Um die Kraft zum Anheben der Reibplatte zu verringern, wird daher zuerst die Spanneinrichtung gelüftet, mit dem Ziel, das obere Bandende außer Eingriff mit dem Spannrad zu bringen und dadurch die zwischen der Reibplatte und dem Spannrad von dem oberen Bandende ausgeübten Kräfte abzubauen.After the welding point 41 has hardened, the device 10 must be removed laterally from the finished strapping. For this it is necessary, on the one hand, to remove the friction plate 19 from the lift off the strip ends underneath to release the gap 23 and on the other hand also to vent the tensioning device 12 in the manner described. Due to the high tensile stress introduced into the band by the tensioning wheel 13, the friction plate 19 is held against the direction of travel 28 in the direction of the tensioning wheel after welding by the upper band end 20. This tensile force is so great that the friction plate can only be brought out of its illustrated position into the raised position again with the application of a very high force. In order to reduce the force for lifting the friction plate, the tensioning device is therefore first released, with the aim of disengaging the upper band end from the tensioning wheel and thereby reducing the forces exerted between the friction plate and the tensioning wheel by the upper band end.
Fig. 4b zeigt in stark schematischer Vereinfachung die Anordnung der einzelnen Bauteile, wie sie beim Stand der Technik zueinander angeordnet sind. Man erkennt hier gut, daß die Trennplatte 16 zwar ein Stück weit vom Spannrad 13 abgehoben ist, das jedoch das obere Bandende 20 nach wie vor noch über ein wenn auch kleineres Bogenmaß mit dem Spannrad in Eingriff ist und von der Trennplatte 16 nicht ausreichend weit freigegeben wird, um außer Eingriff mit der rauhen Oberfläche des Spannrades zu kommen. Der erwünschte Effekt, nämlich die Aufhebung der von dem oberen Bandende auf die Reibplatte 19 wirkenden Kraft, wird daher bei einer Anordnung gem. Fig. 4b ohne das Entsperrelement 32 nicht erreicht.4b shows in a highly schematic simplification the arrangement of the individual components as they are arranged with respect to one another in the prior art. It can be clearly seen here that the separating plate 16 is lifted a little way from the tensioning wheel 13, but that the upper band end 20 is still in engagement with the tensioning wheel over an albeit smaller radian measure and is not released sufficiently far from the separating plate 16 to disengage from the rough surface of the tension wheel. The desired effect, namely the cancellation of the force acting on the friction plate 19 from the upper end of the belt, is therefore in accordance with an arrangement. 4b is not reached without the unlocking element 32.
Bei der Erfindung hingegen wird beim Lüften der Verschließeinrichtung 11 die Trennplatte 16 nicht nur radial vom Spannrad abgehoben, sondern mit Hilfe des Entsperrele ents 32 gleichzeitig auch nach vorne in den weiter werdenden, keilförmigen Spalt 39 zwischen den Bandenden verschoben, wo sie das obere Bandende 20 nicht .länger gegen das Spannrad 13 drückt, so daß jenes sich von der U fangsfläche des Spannrades lösen kann und damit eine Entspannung der Reibplatte 19 bewirkt. Die Reibplatte kann dann leicht in an sich bekannter Weise mit Hilfe eines nicht dargestellten Kipphebelgetriebes und eines dieses betätigenden Stö- ßels 42 angehoben werden und den Spalt 23 freigeben. In Fig. 4a ist als Entsperrelement 32 eine Schraubenzugfeder 43 angedeutet, die das Trennelement 15 beim Lüften der Verschließeinrichtung 11 aus seinen wirksamen Eingriffsbereich unterhalb des Spannrades zieht, wenn durch das Abheben der Andruckplatte 14 der keilförmige Spalt 39 weit genug geöffnet ist, um die Trennplatte freizugeben. In the invention, on the other hand, when the closing device 11 is released, the separating plate 16 is not only lifted radially from the tensioning wheel, but at the same time is also moved forward with the aid of the unlocking device 32 into the widening wedge-shaped gap 39 between the ends of the band, where it is the upper end of the band 20 not .longer presses against the tensioning wheel 13, so that that can detach from the U front surface of the tensioning wheel and thus causes relaxation of the friction plate 19. The friction plate can then easily in a manner known per se with the help of a rocker arm gear, not shown, and an actuating this ßels 42 are raised and the gap 23 free. In Fig. 4a, a helical tension spring 43 is indicated as the unlocking element 32, which pulls the separating element 15 out of its effective engagement area below the tensioning wheel when the closing device 11 is released, when the wedge-shaped gap 39 is opened far enough around the separating plate by lifting the pressure plate 14 to release.

Claims

An s p r ü c h e :Expectations :
Vorrichtung zum Spannen und Verschließen von Umreifungsbändern, insbesondere aus Kunststoff, für Packstückumreifungen, mit einer Verschließeinrichtung zum Verbinden der beiden Bandenden des Umreifungsbandes sowie mit einer Spanneinrichtung, die im wesentlichen aus einem antreibbaren Spannrad, einer gegen das Spannrad anstellbaren bzw. von diesem abhebbaren Andruckplatte und einem zwischen diesen beiden Bauteilen angeordneten, selbsteinstellenden Trennelement besteht, wobei das eine Bandende zwischen dem Spannrad und dem Trennelement und das andere Bandende zwischen diesem und der Andruckplatte aufgenommen ist, g e k e n n z e i c h n e t d u r c h ein das Trennelement (15) beim Abheben der Andruckplatte (14) aus seiner Relativlage zum Spannrad (13) bzw. zur Andruckplatte (14) etwa parallel zu den beiden Bandenden (20, 21) verschiebendes Entsperrelement (32) .Device for tensioning and closing strapping, in particular made of plastic, for package strapping, with a closing device for connecting the two ends of the strapping and with a tensioning device, which essentially consists of a drivable tensioning wheel, a pressure plate that can be set against or removed from the tensioning wheel, and there is a self-adjusting separating element arranged between these two components, one end of the band being accommodated between the tensioning wheel and the separating element and the other end of the band between the tensioning wheel and the pressure plate, characterized by a separating element (15) when the pressure plate (14) is lifted from its relative position to the tensioning wheel (13) or to the pressure plate (14) approximately parallel to the two belt ends (20, 21) sliding unlocking element (32).
Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , d a ß das Entsperrelement (32) im wesentlichen aus einem am Trennelement (15) angreifenden Federelement (43) besteht.Device according to claim 1, which also means that the unlocking element (32) consists essentially of a spring element (43) engaging the separating element (15).
Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i ch n e t , d a ß das Entsperrelement (32) im wesentlichen aus einem mit einer Gleitfläche (38) des Trennelementes (15) zusammenwirkenden Ausrückkeil (33) besteht.Device according to claim 1, which also means that the unlocking element (32) essentially consists of a disengagement wedge (33) which interacts with a sliding surface (38) of the separating element (15).
Vorrichtung nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , d a ß das Trennelement (15) an einem die Andruckplatte (14) tragenden Tragschuh (24) angeordnet ist.Device according to one of claims 1 to 3, d a d u r c h g e k e n n z e i c h n e t, that the separating element (15) is arranged on a support shoe (24) carrying the pressure plate (14).
Vorrichtung nach einem der Ansprüche 1 bis 4, d a du r c h g e k e n n z e i c h n e t , d a ß das Trennelement (15) als Trennplatte (16) mit einer an den Radius (r der Spannrolle (13) angepaßten, gekrümmten Oberfläche (17) ausgestaltet ist. Device according to one of claims 1 to 4, since you are characterized by the fact that the separating element (15) is designed as a separating plate (16) with a curved surface (17) adapted to the radius (r of the tensioning roller (13).
6. Vorrichtung nach einem der Ansprüche 1 bis 5, d a d u r c h g e k e n n z e i c h n e t , d a ß die Andruckplatte (14) fest und das Trennelement (15) etwa parallel zu den Bandenden (20, 21) beweglich am Tragschuh (24) angeordnet ist.6. Device according to one of claims 1 to 5, d a d u r c h g e k e n n z e i c h n e t, d a ß the pressure plate (14) fixed and the separating element (15) is arranged approximately parallel to the band ends (20, 21) movable on the support shoe (24).
7. Vorrichtung nach einem der Ansprüche 1 bis 6, d a d u r c h g e k e n n z e i c h n e t , d a ß das Trennelement (15) mit einem seitlichen Befestigungsende in ein am Tragschuh7. Device according to one of claims 1 to 6, d a d u r c h g e k e n n z e i c h n e t, d a ß the separating element (15) with a lateral fastening end in a on the support shoe
(24) ausgebildetes Langloch (29) mit Spiel einfaßt und in diesem durch mindestens einen mit Spiel durch eine Arretieröffnung im Befestigungsende fassenden Sicherungsbolzen (30) gesichert ist.(24) formed slot (29) surrounds with play and is secured in this by at least one with play through a locking opening in the fastening end gripping safety bolt (30).
8. Vorrichtung nach einem der Ansprüche 1 bis 7, d a d u r c h g e k e n n z e i c h n e t , d a ß das Entsperrelement (32) mittels einer Einsteileinrichtung (35) einstellbar ist.8. Device according to one of claims 1 to 7, d a d u r c h g e k e n n z e i c h n e t, that the unlocking element (32) is adjustable by means of an adjusting device (35).
9. Vorrichtung nach Anspruch 8, d a d u r c h g e k e n n z e i c h n e t , d a ß die Einsteileinrichtung (35) im wesentlichen aus einer Stellschraube besteht.9. The device according to claim 8, d a d u r c h g e k e n n z e i c h n e t d a ß the adjusting device (35) consists essentially of an adjusting screw.
10. Vorrichtung nach einem der Ansprüche 1 bis 9, d a du r c h g e k e n n z e i c h n e t , d a ß das Trennelement (15) von dem Entsperrelement (32) in dem sich beim Abheben der Andruckplatte (14) ausbildenden, etwa keilförmigen Spalt10. The device according to any one of claims 1 to 9, d a th e r c h g e k e n n z e i c h n e t, d a ß the separating element (15) of the unlocking element (32) in the approximately wedge-shaped gap when the pressure plate (14) is formed
(39) zwischen den Bandenden (20, 21) in einer von der Keilspaltspitze bzw. der Verbindungsstelle (41) der Bandenden (20, 21) weg weisenden Richtung verschiebbar ist. (39) can be displaced between the band ends (20, 21) in a direction pointing away from the wedge gap tip or the connecting point (41) of the band ends (20, 21).
EP00902648A 1999-03-05 2000-02-01 Device for tensioning and closing tightening straps Expired - Lifetime EP1159197B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19909620 1999-03-05
DE19909620A DE19909620A1 (en) 1999-03-05 1999-03-05 Device for tensioning and closing strapping
PCT/EP2000/000807 WO2000053500A1 (en) 1999-03-05 2000-02-01 Device for tensioning and closing tightening straps

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EP1159197A1 true EP1159197A1 (en) 2001-12-05
EP1159197B1 EP1159197B1 (en) 2003-05-28

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US (1) US6516715B1 (en)
EP (1) EP1159197B1 (en)
AU (1) AU760079B2 (en)
BR (1) BR0008611A (en)
DE (2) DE19909620A1 (en)
WO (1) WO2000053500A1 (en)

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AU2440900A (en) 2000-09-28
AU760079B2 (en) 2003-05-08
WO2000053500A1 (en) 2000-09-14
EP1159197B1 (en) 2003-05-28
DE50002353D1 (en) 2003-07-03
US6516715B1 (en) 2003-02-11
BR0008611A (en) 2002-01-02
DE19909620A1 (en) 2000-09-07

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