EP1702844B1 - Strapping machine - Google Patents

Abstract

The machine has a belt guide frame with a belt guide channel (14) and a number of closing units (15, 15a-15e) that are arranged over the channel length in rotatable manner, where the units are moved against reset force from a position closing the channel into the position opening the channel. The units are fixed in the position closing the channel by a magnetic locking device. The units cover the channel.

Description

The invention relates to a strapping machine with a tape guide frame with a tape guide channel and a plurality of distributed over the channel length arranged covering elements, such as the strapping machine from the document US 4,781,110 ,

Strapping machines serve for strapping a packaged product, for example a magazine or catalog stack, with a strapping band. Such a machine has a tape storage comprising a roll with wound tape, which is withdrawn from the tape storage and fed via a Einschießeinrichtung the tape guide frame, which is generally rectangular in shape and overlaps the packaged. On the tape guide frame, a guide channel is provided, in which the tape is injected with its leading end, is guided around the frame and is caught again with the leading end. Subsequently, the tape is guided out of the channel, stretched back and laid around the packaged goods, after which it is welded and cut. The packaged goods are then transported away, a new stack of goods supplied.

In order to guide the tape safely in the tape guide channel, the channel must be closed on the one hand over as much of the length as possible, so as to avoid that the tape slips out during shooting. On the other hand, it must be ensured that when the band is stretched back, the same can be easily guided out of the channel. This must therefore open to the band release. For this purpose, it is known to form the tape guide frame from a first, substantially flat, vertical frame part on which a right-angled projection is provided on which in turn a plastic hinge joint is arranged with a metal sheet angle, which is angled substantially at 90 ° and with its free end is substantially orthogonal to the vertical frame. About the sheet metal angle in conjunction with the plastic hinge together with the projection and the frame part of the band guide channel is formed or closed. The hinge and thus the sheet metal angle is now arranged or stored so that when re-tensioning the tape against the Sheet metal angle is guided and is pivoted in a further return movement of the sheet metal angle from the tape to the side, which is made possible by the plastic hinge joint. When the tape is pulled out, the hinge returns the sheet metal angle back to the channel closing position.

This embodiment is disadvantageous in that in continuous operation, the plastic hinge can wear out, that is, the hinge is no longer able with increasing operating time to return the sheet metal angle in the fitting on the frame part, the channel closing position. In addition, the sheet metal part is deformed over time by the constantly occurring Rückspannvorgang, in the context of which the band with relatively high force in a very short time at the metal sheet angle or its leg and this pivots to the side. Overall, a safe closing of the channel after removal of the tape is no longer guaranteed with increasing operating time, which means that sometimes the tape can slide out of the channel before the actual Rückspannvorgang.

The invention is therefore based on the problem of specifying a strapping machine, in which a reliable reversible opening and closing of the band guide channel is ensured even with long service life.

To solve this problem, a tape guide machine with a tape guide frame with a tape guide channel and a plurality of distributed over the channel length arranged closing elements, which are movable from a channel closing position in a channel opening position against a restoring force, provided, which is characterized in that Closing elements via a magnetic closing device in the channel closing position can be fixed.

About the inventively used magnetic closing device, which is associated with each closing element, a channel closure is ensured in each case after the closing element is necessarily pulled over the magnetic closing device after opening in the closed position, regardless of whether the restoring force is operationally reduced or not. The difficulties mentioned above are no longer advantageous after a forced channel closure is ensured via the magnetic closing device. In this case, the magnetic closing device according to the invention can be used in any band guide frame, regardless of how the respective closing element is executed, so even in a band guide frame of example executed within the description introduction form with the angled sheet metal closing element.

A particularly advantageous embodiment of the invention provides for the closing elements to be arranged in a flap-shaped and pivotable manner on the tape guiding frame, so that they cover the tape guiding channel. The tape guide channel is incorporated in this embodiment in the tape guide frame or the central part forming the frame, for example, milled or molded from the house. The closing elements are flap-shaped, so cover the recessed channel, which opens to the frame inside, on the frame inside and can be opened to open to the frame inside out. The closing elements, which can be referred to here as cover elements, are securely locked in the closed position via the magnetic closing device and can be easily swung over the back-tensioned band under opening of the magnetic closing device for tape release.

According to a first embodiment of the invention, a magnetic closing device may comprise two magnetic closing parts, one of which is arranged on the band guiding frame and the other on the closing element. In this case, either one of the two magnetic closing parts may be permanently magnetic and the other ferromagnetic, alternatively, both magnetic closing parts may be permanent magnetic nature. When using flap-shaped closing elements, a particularly advantageous embodiment of the invention provides, on such a flap-shaped closing element on the side facing the tape guide frame side a metal sheet which engages over the channel in the covering position, via which on the one hand a sliding guide of the injected tape is ensured, which also simultaneously forms the second magnetic closing part, that is, the permanent magnetic first magnetic closing part on the tape guide frame cooperates with the sheet metal provided on the closing element to form the magnetic closing device. The closing element itself is made of plastic, the metal sheet is arranged on the element inside, which points to the channel.

An alternative to the embodiment of a magnetic closing device with two magnetic closing parts provides to use a magnetic closing device with only one arranged on the tape guide frame or closing element permanent magnet magnetic closing part, which cooperates with the metallic, ferromagnetic closing element or the metallic, ferromagnetic tape guide frame. If the tape guide frame is made of metal, then it itself forms the second magnetic closing part with which the first permanent magnetic magnetic closing part arranged on the closing element cooperates. Conversely, a metallic, ferromagnetic closing element forms the second magnetic closing part, on the example made of plastic tape guide frame only a permanent magnetic part is provided, which cooperates with the metallic closing element. So, for example, if the flap-shaped closing element formed from a metal sheet, it is sufficient to provide only on the tape guide frame a permanent magnetic closing element.

The first or the second magnetic closing part - regardless of whether it is permanently magnetic or ferromagnetic in nature - should be suitably designed in a band shape in order to realize the magnetic or adhesive closure on a maximum length. Permanent magnet magnetic closing parts are known, for example, in the form of plastic-bonded magnetic tapes. Ferromagnetic locking parts can be readily used in the form of a simple metal strip. In addition, of course, the use of individual magnetic elements or metal elements is conceivable. For example, two, three or four small individual permanent magnets can be used in the tape guide frame distributed over the adhesive length of a closing device, which can cooperate, for example, with a second magnetic closing part on the closing element in the form of a metal strip. The magnetic closing device can thus be designed in many different ways, as long as it is ensured that in any case a secure magnetic closure is realized, and the closing element is best substantially over its entire length either completely or selectively - depending on the configuration of the magnetic closing device - is fixed.

A magnet closing part arranged on the band guide frame or on the closing element can either be placed directly on the frame or the closing element, in the case of band-shaped magnetic closing parts glued on. Alternatively, it is conceivable to arrange or insert the respective magnetic closing part in a receptacle provided there, for example a receiving groove formed on the band guide frame, so that it terminates substantially flush with the frame or closing element surface, thus the surfaces lie directly on one another in the closed position.

A particularly advantageous embodiment of the invention provides to provide differently shaped or designed magnetic closing devices, such that different forces are applied to open the magnetic closure. This makes it possible to assign the different magnetic closing devices to the individual distributed closing elements in such a way that the closing elements open in a predetermined order by the restrained band. Thus, a defined opening order can be realized. For example, it is possible to distribute the different "strong" magnetic closing devices so that the last closing element with respect to the tape insertion direction when re-opening first after the opening of the same the least force is spent, then the penultimate closing element upstream of this, to its opening a slightly higher force is required, finally, the third last closing element upstream of this, etc. Thus, the closing elements open in a predetermined sequence, so that the band can be stretched in a predetermined manner and direction around the packaged.

Alternatively or additionally, it can be provided with particular advantage that the closing elements are designed to be flexible over their length, at least in the region covering the channel, so that they are locally or in sections when a force is applied are openable. The closing elements are thus not rigid at least in the region covering the channel. Accordingly, when a force is applied, the entire closing element does not necessarily open at once, but only the region in which the force acts. If the band is stretched back, this has the consequence that the closing element initially begins to open locally at one end. The tape starts to run out of the channel. The closing element is further opened by the applied force. Behind the tape emerging from the channel, however, the closing element begins to close again due to the magnetic forces or restoring forces. It is therefore only in the area an opening of the closing element is present at which the tape is just emerging from the channel. This area will now wave along the length of the closing element along until it has left the channel below this closing element. Then the closing element remains fully closed back. The magnetic closing device ensures that the closing element is open only at the points where this is just needed to leave the channel. Otherwise, the closing element remains closed, so that deformation is further counteracted. Depending on how flexible or slightly rigid the closure member is formed, the width of the opened portion varies as the tape is pulled out of the channel.

As already described, a flap-shaped closing element expediently consists of a plastic plate, which is cantilevered on one side on the strap guiding frame, and which can be pivoted about this pivoting axis into the opening position. On the plastic plate, the second magnetic closing part is provided in the form of a metal sheet, which serves as described on the one hand the optimal sliding of the band end when shooting, on the other acts as a second magnetic closing part.

Such a flap-shaped closing element made of a plastic plate with a metal sheet which is arranged thereon and forms the second magnetic closing part is particularly suitable for a flexible embodiment for only local openability. As a plastic in this case, for example, polyurethane can be used with a thickness of about 2 mm, as a sheet metal spring steel sheet with a thickness of about 0.2 mm, which is also flexible. Incidentally, no hinge is required in such an embodiment with a flexible closing element.

After, as described, a flap-shaped closing element is pivoted open by the band which acts on it when it is stretched back, it is expedient for the sides of a flap-shaped closing element extending over the channel to run at an angle to the channel longitudinal axis, that is to say the restrained band does not extend orthogonally to the closing element edge, but instead as a result of their angled arrangement at an angle thereto, which allows for easy lifting and opening of the closing element by the tensioned band. Preferably, a closing element is designed substantially trapezoidal.

In order to facilitate the replacement of the same in case of damage or other malfunction of a closing element, so therefore to be able to carry out any maintenance as quickly as possible, a closing element is conveniently mounted on the tape guide frame via a detachable screw, clamp or locking connection.

An expedient development of the invention provides that the closed channel via a flap-shaped closing channel widens in cross-section from a small channel height to a larger channel height. The channel cross section is therefore - unlike in the prior art - not rectangular, but the channel height varies in cross section. This allows the belt to have the opportunity to dodge towards the frame interior during insertion, making it possible to compensate for any belt deformations. Such tape deformations are also called "sabers" and result from tape making when wound on the roll. In this case, the taut band wanders from one end of the roll to the other, so it is therefore stretched slightly on one side and compressed on the other side, this deformation reverses in a reversal of the tape guide direction. This "saber" leads in known tape guide sometimes to the fact that the band during shooting due to the resulting based on the length of the one-sided extension and other compression up in the band guide frame braces, thus So the bullet is blocked and it comes to a disturbance. The unbalanced channel design now allows, on the one hand, the band in the range of low channel height safely lead, on the other hand, the band in the area of the higher channel section emigrate, so relax. A splay is thereby excluded. In this case, the cross-sectional change can be realized by a corresponding profiling and / or dimensioning of the channel walls and / or by a corresponding profiling of the flap-shaped closing element in the region cross-channel.

Fig. 1

eine Prinzipdarstellung einer Umreifungsmaschine mit eingeschossenem Band,

Fig. 2

eine Darstellung der Umreifungsmaschine aus Fig. 1 mit aus dem Bandführungsrahmen gezogenen, zurückgespannten Band,

Fig. 3

eine Prinzipdarstellung eines Bandführungsrahmens in einer Seiten-ansicht,

Fig. 4

eine Schnittansicht durch den Bandführungsrahmen aus Fig. 3 mit einem in der schließenden Stellung befindlichen Schließelement,

Fig. 5

die Schnittansicht aus Fig. 4 mit geöffnetem Schließelement,

Fig. 6

eine Schnittansicht durch einen Bandführungrahmen einer zweiten Ausführungsform,

Fig. 7

eine Schnittansicht durch einen Bandführungsrahmen einer dritten Ausführungsform, und

Fig. 8

eine perspektivische Teilansicht eines Bandführungsrahmens einer vierten Ausführungsform.

Further advantages, features and details of the invention will become apparent from the embodiment described below and from the drawing. Showing:

Fig. 1

a schematic diagram of a strapping machine with inserted tape,

Fig. 2

a representation of the strapping machine Fig. 1 with drawn from the tape guide frame, recaptured tape,

Fig. 3

a schematic representation of a tape guide frame in a side view,

Fig. 4

a sectional view through the tape guide frame Fig. 3 with a closing element in the closing position,

Fig. 5

the sectional view Fig. 4 with open closing element,

Fig. 6

a sectional view through a tape guide frame of a second embodiment,

Fig. 7

a sectional view through a tape guide frame of a third embodiment, and

Fig. 8

a partial perspective view of a tape guide frame of a fourth embodiment.

Fig. 1 shows a strapping device 1 according to the invention comprising a device table 2, on which a tape guide frame 3 is arranged. In or on the device table 2, a strapping tape roll 4 is provided, which is rotatable about the axis A. From this Umreifungsbandrolle 4 strapping 5 is handled. This strapping 5 is, as in Fig. 1 shown shot in the tape guide frame 3 via a Einschießvorrichtung not shown in detail. The free end is collected and passed into a welding device, also not shown in detail. As Fig. 1 shows in the region of the Umreifungsbandrolle a Bandmitnehmer 6 in the form of a pivot lever 7 with a pivot arm 8 is known, on which a driver roller 9 is arranged. The pivoting lever 7 or the pivoting arm 8 is rotatable about the same axis of rotation as the strapping band roller 4. The movement of the pivot lever can be done via an electric motor, and a pneumatically or hydraulically controlled lever movement is conceivable.

The band driver 6 is preceded by a clamping means 10, for example two jaws, between which the strapping 5 is guided. Furthermore, a the band follower 6 downstream further clamping means 11, also for example consisting of two jaws, downstream. Both clamping means 10, 11 can be operated electrically, pneumatically or hydraulically. They serve to clamp the strap between them, depending on the cycle in which the device is located.

Fig. 1 shows as described the situation after the shooting of the strapping tape in the tape guide frame. The Bandmitnehmer 6 is in a first position in which he does not attack the strap. In order to tension the strapping band 5, the pivot lever 8 is moved in the direction of the arrow B. Previously, the clamping means 10 was closed, so that no more band can be deducted from the tape roll 4. The clamping means 11, however, is open. By the pivotal movement of the pivot lever 8 engages the Mitnehmerrolle 9 on the tape, so this tightens. This results in that the strapping tape is pulled out of the tape guide frame 3 and can be stretched around the packaged goods 12, as in Fig. 2 shown. Subsequently, the strapping band 5, which overlaps in the lower frame portion, is welded and cut, after which the strapping operation is completed. The Fig. 1 and 2 are merely exemplary nature. Of course, a strapping device can also be designed otherwise with regard to the tape guide, belt tension, etc.

Fig. 3 shows in a detailed view of the tape guide frame 3. This consists of a substantially square frame member 13, which is preferably made of plastic. The frame part 13 has seen cross-section a wedge shape, see Fig. 4 , Milled or molded into the frame part 13 is a strap guide channel 14, see FIGS 4 and 5 profiled on its underside in the example shown. The tape guide channel 14 runs around the entire tape guide frame 3. Over the length of the tape guide channel 14 distributed in the embodiment shown several closing elements 15 are arranged distributed, of which the 4 and 5 show a sectional view. The closing elements 15 are designed like a flap and consist of a support plate 16, preferably made of plastic, which is arranged on screw connections 17 detachably on the frame part 13. The support plate 16 is pivotable about a hinge 18, here a molded plastic hinge, see Fig. 5 so that they come out of the closed position according to Fig. 4 in the open position according to Fig. 5 can be brought.

At the side of the plate 16 facing the band guide channel, a metal plate 19 is arranged, which preferably extends over the entire length of the carrier plate. This metal sheet 19 forms a magnetic closing member 20, which cooperates with in the example shown, two further arranged on both sides of the channel 14 magnetic closing parts 21 which are arranged on the frame part 13 in corresponding receptacles 22. The magnetic closing parts 21 are permanent magnetic in nature, while the metal sheet 19 is ferromagnetic. The magnetic closing parts 21 are preferably designed strip-shaped or strip-shaped and likewise extend over the length of the carrier plate 16.

Obviously, the two magnetic closing parts 20, 21 cooperate in such a way that the locking device 15 in the in Fig. 4 shown closed position is securely fixed, the magnetic closing parts 20, 21 adhere to each other due to magnetic force.

In operation will now, see Fig. 4 , First, the strapping tape 5 shot. If it is to be re-tensioned, the respective closing element 15 is bound to be opened. When re-tensioning the strap 5 is shortened, it is consequently applied to the metal plate 19 at. In a further Rückspannen the Rückspannkraft and thus acting on the support plate 16, the force exerted by the tape force is so great that the magnetic adhesion between the magnetic closing parts 20, 21 is released, so that the locking device 15 can be pivoted about the hinge 18 around. The tape guide channel 14 is opened, the strapping 5 can be pulled out of it.

As soon as the band 5 has left the band guide channel 14, or no longer acts on the metal plate 19, the hinge 18 returns the carrier plate 16 again. The support plate 16 and thus also the hinge 18 is preferably formed of PU plastic. The hinge 18 is designed so that when pivoting a restoring force is formed, so that the support plate 16 automatically returns to the closed position according to Fig. 4 is urged. In this it is inevitably also pulled due to the increasing attraction of the magnetic closing parts 20, 21 increasing attraction, so it comes to a forced closing.

Are visible, see Fig. 3 , Several locking devices arranged distributed around the band guide channel 14, wherein in this embodiment, the closing devices can be addressed as covering devices. The design of the magnetic closing device, formed by the magnetic closing parts 20, 21, can now be such that forces of different magnitude are required for opening the channel or pivoting the closing device 15. In the embodiment shown in which only the magnetic closing parts 22 are permanently magnetic nature, the force setting by appropriate interpretation of this Magnetic closing parts defined. The configuration can now be such that upon retraction, first the closing device 15a, which can be opened with the least amount of force, is opened, then the closing device 15b, followed by the closing devices 15c, 15d and 15e. It can therefore be set by appropriate interpretation of the strength of the individual magnetic closing parts of the individual locking devices a defined opening order.

If the FIGS. 3, 4 and 5 Locking devices with a support plate 16 of plastic additionally arranged metal plate 19 describe, it is of course also conceivable to carry out the entire support plate 16 made of metal, so that could be dispensed with an additional metal plate 19. Also in this case, a corresponding hinge 18 would be formed in the closing device formed for example of spring steel.

Finally, it should be noted that - see Fig. 3 - The side edges 23 of each locking device extend obliquely to the channel longitudinal axis, so that the opening of the locking device is simplified by the tensioned band.

The 4 and 5 show an asymmetrical geometry of the band guide channel 14, it can be seen - based on the representation - the left channel wall higher than the right, it forms a wedge shape. In the region of the right, low channel wall, the band is relatively tightly guided, while in the opening channel region, there is sufficient room for the left, higher side wall to expand and relax to compensate for any band deformations resulting from banding saber can. So it's like Fig. 4 dashed shows, possible that the band starts up or emigrates.

Fig. 6 shows in the form of a schematic representation of another embodiment of a tape guide frame 24, consisting of a frame part 25 with a milled or molded tape guide channel 26. Again, a locking device 27, which is releasable via a screw connection not shown in detail 28 is arranged on the frame part, provided, also here consisting of a support plate 29 made of plastic with metal sheet 30 arranged thereon. This forms the one magnetic closing part, while a second magnetic closing part 31 is arranged on the frame part 25. Also in this embodiment, for example, the second magnetic closing member 31 is permanent magnetic nature.

As can be seen in this embodiment, a rectangular channel geometry is given while the 4 and 5 show an asymmetrical channel geometry.

Fig. 7 Finally shows a further embodiment of a tape guide frame 32 with a frame member 33 and a tape guide channel 34. Again, a flap-like locking device 35 which is releasably fixed via a screw 36 is provided, also here consisting of a support plate 37 arranged thereon with metal sheet 38th Am Frame part, in turn, a magnetic closing part 39 is arranged, which serves for automatic closing after an opening operation.

As can be seen, the locking device 35 is provided with a running over its length, tapered recess 40, both the part of the plastic support plate 37 so the metal sheet 38. As a result, the otherwise quadrangular band guide channel is divided in the closed position in different high sections, on the one hand, the tight band guide in the center , lower part as well as the relaxation and lateral expansion of the band in the higher part. As indicated by dashed lines, an elevation 41 can also be provided at the channel bottom, which can cooperate with the recess 40, so as to realize an optimal central band guide region. Alternatively, it would also be conceivable to design the locking device 35 not recessed, but merely to provide the elevation 41.

Fig. 8 Finally, shows an embodiment in which the closing element 42 is flexible, not rigid, is formed. Again, it consists of a fairly thin, flexible plastic plate 43, as a magnetic closing part is a thin, equally flexible metal sheet 44 is provided. The closing element 42 covers the frame part 45 formed channel 46. The metal sheet 44 acts as a first magnetic closing part with a second magnetic closing part 47 on the frame 45 together. Fig. 8 FIG. 12 shows a situation in which a tape 48 is being pulled out of the channel 46 during rewinding. The point at which the tape 48 exits the channel 46 is deformed, the closing element 42 is locally opened there. While the band 48 by the restoring force, the closing element 42 in Fig. 8 opens to the left further, the magnetic interaction between the metal sheet 44 as the first magnetic closing part and the second magnetic closing part 47 is sufficient that the closing element 42 shoots from the right behind the band 48 again. The closing element 42 is therefore always opened only locally at the point at which the band 48 is just leaving the channel 46.

It should be noted at this point that, of course, the closing elements of the other embodiments can be made flexible.

Claims (18)

1. Strapping machine with a strapping band guide frame (3) having a band guide channel (14) and plural closing elements (15) distributed over the length of the channel which are movable against a restoring force from a position closing the channel into a position opening the channel, characterised in that the closing elements (15, 15a-e, 27, 35, 42) are fixable via a magnetic closing device in the position closing the channel (14, 26, 34, 46).
2. Strapping machine according to claim 1, characterised in that the closing elements (15,15a-e, 27, 35, 42) are arranged in the form of flaps pivotably on the strapping band guide frame (3, 24, 32) and cover the strapping band guide frame (14, 26, 34, 46).
3. Strapping machine according to claim 1 or 2, characterised in that a magnetic closing device comprises two magnetic closing parts (20, 21, 30, 31, 38, 39, 44, 47), of which one is disposed on the strapping band guide frame (3, 24, 32) and the other is disposed on the closing element (15, 15a-e, 27, 35).
4. Strapping machine according to claim 3, characterised in that one of the two magnetic closing parts (21, 31, 39, 47) is permanently magnetic and the other (20, 30, 38, 44) is ferromagnetic, or both magnetic closing parts (20, 21, 30, 31, 38, 39, 44, 47) are permanently magnetic.
5. Strapping machine according to claim 4, characterised in that on the flap-like closing element (15, 15a-e, 27, 35, 42) on the side facing the strapping band guide frame a metal plate (20, 30, 38, 44) is provided which overlaps the channel (14, 26, 34, 46) in the covering position and simultaneously forms the second magnetic closing part.
6. Strapping machine according to claim 1, characterised in that a magnetic closing device comprises a permanently magnetic closing part which is disposed on the strapping band guide frame (3, 24, 32) or on the closing element (15, 15a-e, 27, 35, 42) and which cooperates with the metal, ferromagnetic closing element (15, 15a-e, 27, 35, 42) or strapping band guide frame (3, 24).
7. Strapping machine according to one of the preceding claims, characterised in that a metal closing device comprises first or second magnetic closing parts (20, 21, 30, 31, 38, 39, 44, 47) in strip form or in the form of individual elements.
8. Strapping machine according to claim 7, characterised in that the first or second magnetic closing parts (20, 21, 30, 31, 38, 39, 44, 47) are so arranged or dimensioned that a closing element (15,15a-e, 27, 35, 42) is fixed in the closed position substantially over its entire length.
9. Strapping machine according to one of the preceding claims, characterised in that a magnetic closing part (20, 21, 30, 31, 38, 39, 44, 47) disposed on the strapping band guide frame (3, 24, 32) or on the closing element (15,15a-e, 27, 35, 42) is disposed in a recess (22) provided thereon and ends substantially flush with the frame surface or closing element surface.
10. Strapping machine according to one of the preceding claims, characterised in that differently formed or arranged magnetic closing devices are provided, in such a manner that in order to open the magnetic lock different degrees of force are required.
11. Strapping machine according to claim 10, characterised in that the different magnetic closing devices are so allocated to the individually distributed closing elements (15a-e) that the closing elements (15a-e) open in a predetermined sequence by means of the back-tensioned band.
12. Strapping machine according to one of the preceding claims, characterised in that the closing elements (15, 15a-e, 27, 35, 42) are formed flexibly over their length at least in the region overlapping the channel (14, 26, 34, 46) so that upon application of a force they can be opened locally or in part.
13. Strapping machine according to one of the preceding claims, characterised in that a flap-like closing element (15, 15a-e, 27, 35, 42) consists of a plastics plate (16, 29, 37, 43) which is pivotably mounted on one side on the strapping band guide frame (3, 24, 32).
14. Strapping machine according to claim 13, characterised in that on the plastics plate (16, 29, 37, 43) a metal plate (20, 30, 38, 44) forming the second magnetic closing part is disposed.
15. Strapping machine according to one of the preceding claims, characterised in that the sides of a flap-like closing element (15, 15a-e, 27, 35, 42) overlapping the channel (14, 26, 34, 46) extend at an angle to the channel longitudinal axis.
16. Strapping machine according to one of the preceding claims, characterised in that a closing element (15, 15a-e, 27, 35, 42) is mounted on the strapping band guide frame (3, 24, 32) by a releasable screw, clamping or catch connection (17, 28, 36).
17. Strapping machine according to one of the preceding claims, characterised in that the channel closed via a flap-like closing element (15, 15a-e, 35) expands in cross-section from a small channel height to a larger channel height.
18. Strapping machine according to claim 17, characterised in that the cross-sectional variation is realised by corresponding profiling and/or dimensioning of the channel walls and/or by corresponding profiling of the closing element (15, 15a-e, 35) in the region overlapping the channel (14,34).

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