EP1243509B1 - Strapping machine with divisible strap guiding frame - Google Patents

Abstract

The wrapping machine for wrapping packages (5) with strips of material (9) has a strip guide frame made up of two semi-circular sections (7, 8). These can be moved form an open position below the package support table (4) to a closed position by two pairs of rollers (14, 16, 15, 17, 18, 20, 19, 21) on each section. An Independent claim is included for the strip guide frame.

Description

The invention relates to a device for strapping packages, with a tape supply for a strap-like strapping, with a Strap guide channel for passing the strapping and with a closing unit for closing the strapping means formed and the package surrounding loop, the tape guide channel is arranged on a frame consisting of two arcuate Frame parts consists of a rest position below a support surface for the packaged goods in a closed position above the support surface and can be moved back.

In such strapping machines is a on the support surface Support table placed a packaged goods so that it is in the closed position of the Frame parts are surrounded by this frame. The band-shaped strapping tool, briefly called strapping, which from a supply roll was withdrawn and recorded in a tape storage device, is about a tape drive at high speed the tape guide channel fed so that it follows the course of the channel around the package. The tape is then pulled out of the tape guide channel and tensioned around the package by a tensioning drive. The the Package closely surrounding loop is separated from the tape supply, and the two ends of the strapping are connected together. According to the prior art, this is done by welding, in particular by friction welding.

Such devices are known from the French patent application FR 2 306 882 and European patent EP 0 596 303 B1.

FR 2 306 882 describes a strapping machine with a pivotable strap guide frame divided in the middle. The band guide channel is divided into two substantially semicircular segments which are received in two frame parts which can be pivoted about a pivot axis. The piston rod of a pressure cylinder engages at a distance from the pivot axis of each frame part. With this pressure cylinder, each frame part can be pivoted from a rest position, in which it is pivoted under the support surface for the packaged goods, into a closed position. In the closed position, both frame parts are above the support surface for the packaged goods. The end faces of the two frame parts lie against one another above the packaged goods, so that a closed, essentially annular band guide channel is formed. Because the two frame parts, which form the belt guide channel, can be pivoted completely under the support surface for the packaged goods, it is possible to move bulky or long packaged goods in any direction on the support surface before or after it is guided with one through the belt guide channel Strapping is strapped. The disadvantage of this embodiment is that the two frame parts pivot laterally away from the support surface for the packaged goods. There must therefore be sufficient space in the strapping machine for pivoting the two frame parts. As a result, the size of the strapping machine and the space required for the strapping machine increase considerably.
Another embodiment of such a strapping machine is evident from EP 0 596 303 B1. Here the two frame parts can be moved from the closed position, in which they grip the packaged goods above the support surface, into an open position below the support surface, without being pivoted sideways. In the closed position, the strap guide channel formed by the two frame parts is located in the strapping plane in which the strap is guided around the package. When lowering the frame parts, these are moved downward by a complex lever linkage, essentially translationally, in the vertical direction and thereby pivoted through a certain angle, so that they open like a pair of pliers in order to be able to be moved past the package during lowering , In order to avoid a collision of the two frame parts with the machine parts located in the strapping plane below the support surface, in particular the sealing unit, the frame parts are displaced transversely relative to the strapping plane in such a way that their rest position is parallel to and next to the above-mentioned machine parts located in the strapping plane Find. This extremely short transversal movement, which is necessary in accordance with the cited document, results from the lever drive used here for the frame parts and the movement path running through the frame parts. This movement path runs along large areas below the support table, so that it can only take place next to the strapping plane with the machine parts, such as the sealing unit.

The object of the invention is a strapping device of the aforementioned Kind in such a way that to open and close the frame parts a simple drive and a simplified guide for the frame parts can be used.

This object is achieved in that each frame part below the support surface by at least one guide device is slidably guided along its arcuate centerline.

Through the proposal according to the invention, each frame part below the Support surface slidable along its arcuate centerline lead, the closing movement and the opening movement of the Frame according to a completely new compared to the prior art Kinematics. The frame is not pivoted about a fixed pivot axis it is still translational and rotary through a lever mechanism relocated. According to the invention, the storage of each frame part allows only its longitudinal displacement in the direction of the arcuate Centerline. An arcuate slidable along an arcuate line Part can be on its arcuate path around the strapping area around the strapping machine. In other words after placing the package on the support surface on each Side of the package a frame part by moving along a arcuate track moved around the package until both frame parts form a closed tape guide channel in the closed position, the encompasses the package. To open the frame parts are in the opposite Direction moves, in the guide device of the arcuate center line following each frame part itself located completely below the contact surface.

In a preferred embodiment of the strapping machine, each is Frame part curved in a circular arc and essentially forms one Section of an annulus. Each frame part preferably forms just that Half of a closed annulus, that is, forms its center line an arc of about 170 ° to 175 °. Every frame part should have one Wear the band guide channel that extends over a quarter of a circular ring (approx 90 °) extends. So is about half of the semicircular frame part a tape guide channel arranged. The other half of the semicircular The frame part is free of a tape guide channel. This Embodiment is particularly advantageous if the two Frame parts are arranged in two mutually offset levels and the Parts of the tape guide channel on the facing surfaces of the Frame parts lie so that both parts of the tape guide channel essentially lie in the same vertical plane. The semicircular Frame parts must be closed by 90 ° to close the belt guide channel Center of the closed frame parts in opposite directions be moved. The end faces of the parts are in this closed position of the tape guide channel against each other so that they are closed Form the tape guide channel. To open the tape guide channel, the Frame parts in turn around 90 ° in opposite directions Center of the closed frame moves around. In the rest position the two half-ring-shaped frame parts are essentially next to each other under the support surface, the part of the tape guide channel, which is attached to the first frame part and over 90 ° of Circular arc of this first frame part extends, in a band guide channel free section of the second frame part lies and vice versa.

The guide device for the frame parts according to the invention can be trained very easily. You should have at least two leadership roles exist which are arched against the first and against the second rest on the curved surface of the frame part. The Guide rollers can be designed as a drive roller and with a Drive motor, in particular an electric motor, may be connected. At a preferred embodiment is in addition to the guide rollers separate drive roller is provided, which against one of the arcuate curved surfaces of the frame part abuts. Of course you can the drive roller also against a non-curved surface of the frame part Act. Each frame part is preferably in two pairs of guide rollers led, which at opposite positions against the Fit the surfaces of the frame and on the one hand close below the Support surface and on the other hand arranged approximately in the middle of the machine are. The two axes of the pair of guide rollers close to the contact surface lie on a straight line slightly inclined to the horizontal direction. The two axes of the rollers of the guide roller pair in the middle of the Machine lie on a straight line that is slightly vertical is inclined. Thus, the strapping machine includes on both sides of it vertical center plane, two pairs of guide rollers for each frame part, which the frame part in the form of a half circular ring at two positions lead to each other by almost a quarter circle, based on the Center of the circular ring formed by the frame parts, offset from one another are. These two pairs of guide rollers give the two frame parts a very great stability, being arranged in a machine housing is relatively easy to implement constructively.

Between the two pairs of guide rollers that carry a frame part preferably a drive roller is provided, which against a surface of the frame part. The drive roller preferably rolls on the inner curved surface of the frame part. The driving role is preferably driven and acts by a controllable electric motor via a friction lining on the surface of the frame part. The friction lining ensures that there are no excessive driving forces from the electric motor the frame part are transferred. Depending on the choice of the contact pressure for the Drive roller and the coefficient of friction between the friction lining Drive roller and the frame part is the driving force for the frame part limit so that no people due to the moving frame part can be injured.

Furthermore, the controllable electric motor for driving the frame parts go through different speed levels. Especially just before the closing of the frame parts by mutual contact of their front The drive speed can be reduced on the end faces. So will prevents a person standing between the closing frame parts engages, injured by a too high closing speed of the frame parts becomes.

As an alternative to a friction roller, a positive one can of course also be used Drive element, for example a gear, can be used which cooperates with a ring gear on the frame part. If A slip clutch can also be used to limit the driving force be provided between the drive element and the electric motor.

In a preferred embodiment of the invention, the tape guide channel is formed as a closed tape guide channel, that is, in the closed state the tape guide channel on all sides of in substantially immovable walls are closed. To this end are the parts of the tape guide channel transverse to their arcuate center line, that is, transversely to the vertical strapping plane, displaceable on the Frame parts attached. When the belt guide frame is closed, the both parts of the tape guide channel moved so that they are in one plane lie. Each part of the tape guide channel comprises an open on one side Slot that forms the cavity for receiving the tape itself. The slot open on one side is opposed by the surface of the frame part the part of the tape guide channel is closed. After this Shoot the strapping into the strap guide channel and before Tensioning the strapping by the tensioning drive for the strapping the tape guide channel is opened by the two parts each in the opposite direction across the strapping plane about the width of the strapping are moved. This will be in its main level relatively rigid, flat strapping through the two parts of the Locked in its original position so that it out of the Slot in the part of the tape guide channel emerges. By withdrawing of the strapping by means of the tension drive is the formed Band loop pulled together.

Before opening the two frame parts that form the tape guide channel, the parts of the tape guide channel can again be against the frame parts be moved so that they are flush. The transverse displacement of the two parts of the band guide channel relative to the respective frame parts, to which the channel parts are attached, can be by any drive means, for example magnetic drives, pneumatic drives, control cams or lever drives can be effected.

The end faces of the two parts of the tape guide channel preferably have Centering means, which when closing the tape guide channel align the two parts of the tape guide channel. Is preferably in an end face of part of the tape guide channel a conical hole is made. On the other face is a conical mandrel attached. When closing the tape guide channel the end faces of its two parts are moved against each other. there the conical mandrel penetrates into the conical bore. In the completely closed position are the end faces of the two parts of the Belt guide channel aligned exactly to each other, so that no gradation in the tape guide channel occurs, which the fast feed and that Shoot through the strapping could hinder.

To ensure reliable operation of the strapping machine according to the invention To ensure, is preferably a sensor for detecting the closed position of the two frame parts provided. Only in the closed position Feeding of the strapping released. Should the framework that the Belt guide channel forms, either through the package or through a other obstacle in its trajectory at full closure are prevented, the tape feed is blocked. This ensures that only if the tape guide channel is closed properly into the tape guide channel.

In addition to the limitation of the driving force described above Frame parts via a slip clutch is also possible via a Sensor for detecting the driving force acting on the frame parts that Increase security for people. If the sensor has too high a driving force measure, for example if a frame part before the closed position meets an obstacle, the power supply for the drive device be interrupted for the frame parts.

The preferred embodiment of the strapping machine with two semi-ring-shaped Frame parts in two different levels, the parts of the tape guide channel on the opposite surfaces of the Frame parts are arranged essentially in the same plane preferably attached to a support frame having the cross section of a has inverted "U". The support frame consists of two opposite one another vertical side walls and one between these side walls trending wing. The machine parts are on the wing the strapping machine, especially the sealing unit, the belt drive as well as the guide elements, which the from the tape storage Insert the supplied tape into the tape guide channel near the support surface and the tension drive arranged.

Preferably, a frame part is on each side cheek of the support frame Formation of the tape guide channel attached. The side cheek carries the two pairs of guide rollers and the drive motor with the drive roller for the respective frame part. Preferably for the two side cheeks identical components are used, with identical pairs of guide rollers and drive motors used for the two frame parts can be. This significantly reduces the number of components which are used to manufacture the strapping machine according to the invention Need to become.

Finally, the surfaces of the frame parts and the are preferably rolls rolling on it complementarily curved, so that the Frame parts through the attached to the support frame of the machines Rollers are stabilized in the transverse direction.

Of course, individual features of the invention can be varied, without departing from the scope of the disclosure and the claims. So it is not absolutely necessary that the frame parts be exact have ring-section shape. The curvature can also be from one circular curvature deviate, but care must be taken that unbalance forces can be observed when closing and opening the frame parts are. The guiding devices for the frame parts are formed. It also becomes not exactly circular Frame parts usually need to be single guide rollers mobile, e.g. biased to the supporting frame by a spring force of the machine so that these guide rollers follow the surface can follow. Only when moving an annular The frame part lie along its arc-shaped center line Surface sections that lie against the guide rollers are always on the same position.

Fig. 1

eine Seitenansicht einer erfindungsgemäßen Umreifungsmaschine mit geschlossenem Bandführungsrahmen,

Fig. 2

eine schaubildliche Ansicht der Maschine aus Fig. 1 mit geöffnetem Bandführungsrahmen,

Fig. 3

eine schaubildliche Darstellung der Maschine aus den vorangehenden Figuren mit geschlossenem Bandführungsrahmen,

Fig. 4

eine der Fig. 3 entsprechende Darstellung mit geöffnetem Bandführungskanal bei geschlossenem Bandführungsrahmen,

Fig. 5

eine der Fig. 4 entsprechende Darstellung der Umreifungsmaschine mit teilweise geöffnetem Bandführungsrahmen,

Fig. 6

eine Draufsicht auf den geschlossenen Bandführungsrahmen mit geschlossenem Bandführungskanal,

Fig. 7

eine der Fig. 6 entsprechende Darstellung mit geöffnetem Bandführungskanal bei geschlossenem Bandführungsrahmen,

Fig. 8

eine Stirnansicht des oberen Teils des Rahmenteils (8) und des Teils (27) des Bandführungskanals.

An embodiment of the invention will now be described with reference to the accompanying drawings. The drawings show in:

Fig. 1

a side view of a strapping machine according to the invention with closed strap guide frame,

Fig. 2

2 shows a perspective view of the machine from FIG. 1 with the tape guide frame open,

Fig. 3

2 shows a diagrammatic representation of the machine from the preceding figures with the belt guide frame closed,

Fig. 4

3 shows an illustration corresponding to FIG. 3 with the tape guide channel open and the tape guide frame closed,

Fig. 5

4 shows a representation of the strapping machine with the strap guide frame partially open,

Fig. 6

a plan view of the closed tape guide frame with closed tape guide channel,

Fig. 7

6 shows an illustration corresponding to FIG. 6 with the tape guide channel open and the tape guide frame closed,

Fig. 8

an end view of the upper part of the frame part (8) and the part (27) of the tape guide channel.

The strapping machine shown in the accompanying drawings has a supply roll 1 for the strapping. The strapping usually consists of a flat plastic tape with 5 to 15mm Width and less than 1mm thick. The strapping is from the Supply roll 1 removed and a tape storage in the area of the machine frame 2 fed to the strapping machine. From the tape storage the tape is up in the area of the tape guide frame 6 and the closure unit 3 transported. The tape is fed thereby in a known manner via transport rollers. The also takes place Tension via tension rollers, which are known from the prior art and not described in connection with the present invention Need to become. In the area of a bearing surface 4, on which a Package 5 can be placed, the tape is the tape guide channel Tape guide frame 6 fed from the two frame parts 7,8 is formed. A loop formed by the strapping is in shown in part of the drawings and with the reference number 9 characterized. The package 5 is only symbolic as an elongated part shown with a rectangular cross section.

The bearing surface 4 for the package 5 is usually one Support table formed, which covers the closure assembly 3 above. The Support table 4 only has openings for the passage of the two Frame parts 7, 8 of the tape guide frame 6 and one in the middle Slot for the passage of the loop 9 of the strapping. The The support table is just like the one surrounding the strapping machine Housing for clarity in the accompanying drawings not shown.

The tape guide channel of the device according to the invention is by the consisting of two frame parts 7, 8 frame 6. He can from the 1, 3 and 6 shown in the closed position in Fig. 2 Opening position below the bearing surface 4 can be moved. In the closed position, the tape guide frame 6 forms a semicircle above the contact surface 4. A closed semicircular band guide channel is defined by this tape guide frame 6.

2, the two frame parts 7, 8 are shown in the rest position, in which they are completely below the bearing surface 4 for the package lie.

1 shows how the two frame parts 7, 8 of the Belt guide frame 6 on a support frame 10 of the strapping machine are stored. The support frame 10 is composed of two vertical Sidewalls 11, 12 (see FIG. 4) and an upper wing 13. The Airfoil 13 extends between the two side cheeks 11, 12 and runs essentially horizontally. The machine parts are on the wing 13 the strapping machine, especially parts of the belt drive and the closure assembly 3 is arranged.

On each side cheek 11, 12 of the support frame of the strapping machine is depending a frame part 7.8 attached. 1 shows an assembly drawing all components of the machine, the side cheek 12 being omitted is. So the guide and drive for the frame parts 7,8 clear. The frame part 7 is fastened to the side cheek 11. The side cheek 11 carries two pairs of guide rollers 14, 16 and 15, 17, each of which an outer roller 14,15 and an inner roller 16,17 exist. The outer roles 14,15 lie against the convexly curved outside of the ring-shaped Frame part 7. The inner rollers 16, 17 lie against the concave Inside of the frame part 7. Also on the one not shown in FIG. 1 Sidewall 12 are two pairs of guide rollers 18, 20 and 19, 21, respectively consisting of an outer roller 18,19 and an inner roller 20,21 attached. These guide rollers 18 to 21 carry the second frame part 8.

Is between the two pairs of guide rollers on each side cheek 11,12 a drive roller 22,23 arranged by an electric motor 24,25 (see Fig. 7) is driven. Each drive roller 22,23 works as Friction roller, that is, it can drive up to a certain limit transfer. If this limit is exceeded, the Surface of the roller against the surface of the frame part 7.8. In this way, the closing force of the two frame parts 7, 8 is limited.

6 and 7, the spatial arrangement of the semicircular Frame parts 7.8 shown. The frame parts 7,8 are in two to each other staggered levels so that they are from that shown in Figs. 1 and 6 Closed position over any intermediate positions (see. Fig. 5) in the in Fig. 2 opening position shown can be moved. On each of the Frame parts 7,8 is a quarter-circular part 26,27 to form the Tape guide channel attached. As can be seen in particular in FIG each part 26,27 of the tape guide channel is essentially in the form of a about 90 ° covering section of an annulus. As especially in 5, each of the parts 26, 27 has a slot in the middle on the side of the part 26 facing the frame part 7 or 8 or 27 is open.

6 and 7 show, the parts 26, 27, which are the slot for Have formation of the tape guide channel with respect to the frame parts 7,8 slidably mounted in the direction transverse to the strapping plane. If 6 against the frame parts 7, 8, the parts 26, 27 can be firmly seated create a closed tape guide channel. By moving the Parts 26, 27 in the direction transverse to the strapping plane become the strap guide channel 7 opened. There will be a gap between the frame part 7 and 8 and the attached part 26 and 27 generated by the the strapping can leave the strap guide channel and around that Package 5 can be pulled around. The use of such closed strap guide channel has the advantage that strapping injected into the tape guide channel with different bandwidths can be. With so-called open tape guide channels or with Belt guide channels with pivotable flaps there is a risk that a thin band flutters when shooting into the band guide channel and in the worst case, the tape guide channel is blocked. With the closed Belt guide channel this risk is significantly reduced. The invention Machine with closed belt guide channel can thus be used Use a wide variety of tape thicknesses. The Use of such a closed tape guide channel is in particular by the drive device and guide device according to the invention for the frame parts, which allows a transverse displacement make the frame parts unnecessary.

As can be seen in FIGS. 1 to 5, it is in the case of the invention Drive the frame parts 7,8 in the direction of their curved center lines possible, all machine parts, especially the locking unit 3, to be arranged within the annular movement path of both frame parts 7, 8.

With the help of the attached drawings, the movement sequences can be explain for strapping a package 5. First there are the Frame parts 7,8 in their rest position below the bearing surface 4 for the Package (see Fig. 2). The support table that forms the support surface 4 (not shown in Fig. 2) is thus free of obstacles, so that Package can be moved anywhere on the support table. It is however, it is also possible to set one of the frame parts 7,8 by a certain amount To drive a distance, for example 10 cm, out of the support surface 4, so that this frame part 7,8 a stop for the package forms. As soon as a package 5 is pushed onto the support surface 4, are the two frame parts 7,8 by the drive rollers 22,23 from the Support surface 4 moves upwards until it is shown in Fig. 1 Accept the closed position. In the open position (Fig. 2) are the two semicircular frame parts 7, 8, which are offset from one another in two Levels lie, essentially in register within the supporting frame the machine. The parts 26,27 to form the tape guide channel, which each form about a quarter of a circular ring, each extend over half of the two frame parts 7.8.

In the extended closed position of the tape guide frame 6, which in 1 and 3 can be seen, the end faces of the parts 26,27 are Formation of the tape guide frame against each other. Here are the Frame parts 7.8 means for aligning the end faces of the parts 26.27 the tape guide channel arranged to each other. These funds consist of two alignment blocks 29.30. The first alignment block 29 carries a centering pin 31. The second alignment block 30 essentially has one conical bore 32 for receiving the centering pin 31. The two Alignment means ensure that the frame parts 7,8 and thus in the closed Condition (see FIG. 6) of the parts 26, 27 of the tape guide channel are exactly aligned with each other, so that the strapping is resistance-free passed through the semicircular tape guide channel can be.

After passing the strapping through the band guide channel are the two parts 26,27 of the tape guide channel with respect to the frame parts 7,8 moved transversely, so that a gap for pulling the Strapping is released. Then the two Frame parts 7.8 by the electric motors 24.25 back under the Contact surface 4 are moved.

The guide means, that is, the guide rollers 14 to 21 for the two Frame parts 7,8 are very simple and inexpensive as standard components train and attach to the support frame of the strapping machine. The drive of the two support frames 7, 8 also uses electric motors 24.25 an extremely simple, well controllable and inexpensive drive variant . In particular, it is possible to control the Electric motors 24, 25 drive the frame parts 7, 8 independently of one another. For example, one of the frame parts 7, 8 can be fed of a new package 5 by a few centimeters from the support surface 4 be pushed upwards to make a stop for the package 5 to build.

The time for the creation of a strapping of a package 5 can by Superimposition of the different work sections considerably shortened become. So after opening the tape guide channel (see Fig. 4) and tightening the loop 9 of the strapping Frame parts 7,8 already opened to form the tape guide channel are (see. Fig. 5), while the welding unit 3 still the two Ends of the loop 9 welded together. For the sake of clarity is the loop 9 of the strapping in the figures with very large distance to the package 5 shown. In practice, the Loop 9 stretched around the package 5 before welding, see above that it lies essentially firmly against the package 5.

LIST OF REFERENCE NUMBERS

1

supply roll

2

machine frame

3

sealing unit

4

bearing surface

5

package

6

Strap guide frame

7

frame part

8th

frame part

9

loop

10

supporting frame

11

side cheek

12

side cheek

13

wing

14

outer roller

15

outer roller

16

inner roller

17

inner roller

18

outer roller

19

outer roller

20

inner roller

21

inner roller

22

capstan

23

capstan

24

electric motor

25

electric motor

26

Part of the tape guide channel

27

Part of the tape guide channel

28

Slot, tape guide channel

29

alignment block

30

alignment block

31

spigot

32

conical bore

Claims (15)

1. A device for strapping packages (5) having a tape supply for a tape-like strapping means, a tape guide channel for passage of the strapping means and a sealing unit (3) for sealing the loop (9) formed by the strapping means and surrounding the package (5), the tape guide channel being arranged on a frame (6) consisting of two curved frame parts (7, 8), which are movable out of a rest position below a supporting surface (4) for the packages (5) into a closed position above the supporting surface (4) and back, characterized in that each frame part (7, 8) below the supporting surface (4) is guided moveably along its curved centre line by at least one guiding device.
2. A device according to claim 1, characterized in that each frame part (7, 8) is curved in the shape of an arc of a circle.
3. A device according to claim 1 or 2, characterized in that the guiding device for a frame part (7, 8) consists of two guide-roller pairs (14, 16; and 15, 17; or 18, 20 and 19, 21), each guide-roller pair comprising two guide-rollers facing one another and resting on the arc-shaped curved surfaces of the frame part (7; 8).
4. A device according to one of the preceding claims, characterized in that it has at least one drive roller (22, 23), which rests against a surface of at least one frame part (7, 8).
5. A device according to claim 4, characterized in that a drive roller (22, 23), which is driven by an electric motor (24, 25), rests against each frame part (7, 8).
6. A device according to claim 4 or 5, characterized in that the drive roller (22, 23) has a friction coating on its circumference.
7. A device according to one of the preceding claims, characterized in that the two frame parts (7, 8) are arranged in two planes offset with respect to one another and in that a part (26, 27) for the formation of the tape guide channel is fastened on both faces of the frame parts (7, 8) facing one another, these parts (26, 27) lying in essentially the same plane.
8. A device according to one of the preceding claims, characterized in that the parts (26, 27) of the tape guide channel are fastened to the frame parts (7, 8) moveable transverse to the strapping plane.
9. A device according to one of the preceding claims, characterized in that means for alignment of the faces of the parts (26, 27) of the tape guide channel are arranged on or near said faces.
10. A device according to claim 9, characterized in that the aligning means are formed of a conical bore (32) fastened to the first frame part (8) and a tapered plug (31) fastened to the second frame part (7).
11. A device according to one of the preceding claims, characterized in that it comprises a sensor for detection of the closed position of the frame parts (7, 8).
12. A device according to claim 11, characterized in that it comprises a control device that releases the feed of the strapping tape when the sensor emits a signal representing the closed position of the frame parts (7, 8).
13. A device according to one of the preceding claims, characterized in that it has a sensor for detection of the driving force acting on the frame parts (7, 8), which sensor deactivates the drive device (24, 25) for the frame parts (7, 8) when the driving force is too high.
14. A device according to one of claims 2 to 13, characterized in that each frame part (7, 8) has essentially the shape of one-half of a circular ring and each part (26, 27) of the tape guide channel fastened to a frame part (7, 8) has the shape of one quarter of a circular ring.
15. A device according to one of the preceding claims, characterized in that it is fastened to a supporting frame that has two facing cheeks (11, 12) and a bearing surface (13) extending between the cheeks (11, 12), a frame part (7, 8) of the tape guide channel being moveably fastened to each cheek (11, 12) and the bearing surface (13) supporting the sealing unit (3).

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