EP2994391A1

EP2994391A1 - Strapping arrangement

Info

Publication number: EP2994391A1
Application number: EP14730061.0A
Authority: EP
Inventors: Pascal AMACKER; Andreas Keller
Original assignee: Orgapack GmbH
Current assignee: Signode Switzerland GmbH
Priority date: 2013-05-05
Filing date: 2014-05-05
Publication date: 2016-03-16
Also published as: US9994341B2; CH708294A2; CN105358433B; EP2994392A1; EP2994389A2; PL2994390T3; ES2688580T3; EP2994390A2; CN105358434B; CH708328A2; CN105358435A; WO2014179895A2; CN105358433A; WO2014186911A1; WO2014194434A1; TWI638751B; TW201502011A; CH708332A2; CN105358434A; US10640244B2

Abstract

The invention relates to a strapping arrangement (1) which is intended for strapping articles using a strapping band and has a tensioning device (6) for applying tensioning to a loop of a strapping band, wherein the tensioning device (6, 86) is provided with a tensioning wheel (7, 87) which can be driven in rotation about a tensioning axis and is provided for engaging in the strapping band, the tensioning device (6, 86) also has a tensioning plate (9, 89), wherein, during a tensioning operation carried out by the tensioning device, provision is made for a strapping-band portion with one or more layers to be located between the tensioning wheel (7, 87) and the tensioning plate (9, 89) and to be in contact both with the tensioning wheel (7, 87) and with the tensioning plate (9, 89), in addition the tensioning wheel and/or the tensioning plate are/is arranged on a rocker (8, 80), which can be pivoted by motor about a rocker axis (8a), in order for a pivoting movement of the rocker (8, 80) either to increase or to decrease a distance between the tensioning wheel (7, 87) and the tensioning plate, and have/has a connecting device in order to establish a permanent connection at two regions of the loop of the strapping band which are located one above the other. In order to create a high level of functional reliability for such a strapping arrangement (1), so that the envisaged tensioning can be applied reliably, and as far as possible without slippage, to the band, the invention proposes an operable actuating device of the strapping arrangement which is provided with a button/switch which allows a switching state of a gear mechanism of the strapping arrangement to be altered such that a drive movement of the drive device results either in the tensioning wheel rotating or in the rocker (8, 80) pivoting.

Description

strapper

The invention relates to a strapping device for strapping of packaged goods with a strapping, which has a tensioning device for applying a belt tension on a loop of a strapping, wherein the tensioning device is provided with a motor rotatably driven about a clamping axis tensioning wheel, which is provided for engagement in the strapping in that the tensioning device further comprises a tensioning plate, wherein during a tensioning operation performed by the tensioning device it is provided that a single or multilayered portion of the strapping belt is located between the tensioning wheel and the tensioning plate and is in contact with both the tensioning wheel and the tensioning plate the tensioning wheel and / or the clamping plate is arranged on a rocker pivotable about a rocker axis by a motor in order to either increase or decrease a distance between the tensioning wheel and the tensioning plate by a pivoting movement of the rocker, and a connection device for producing a permanent connection, in particular a welded connection, on two superimposed areas of the loop of the strapping band by means of a connecting element, such as a welding element which is provided for local heating of the strapping.

Such strapping devices are used for strapping packaged goods with a plastic band. For this purpose, a loop of the respective plastic strip is placed around the packaged goods. In general, the plastic tape is hereby deducted from a supply roll. After the loop is completely wrapped around the packaged goods, the end portion of the band overlaps with a portion of the band loop. The strapping device is then applied to this two-layer region of the band, in which case the band is clamped in the strapping device, a band tension is applied to the band loop by means of the tensioning device, and a closure is produced by friction welding to the loop between the two band layers. In this case, the belt loop is pressed onto the belt with an oscillatingly moving friction shoe in the region of two ends. The pressure and the heat generated by the movement melts the usually plastic having

CONFIRMATION COPY Tape up locally for a short time. This creates between the two band layers a permanent and at most with great force again to be solved connection between the two band layers. Thereafter, or approximately simultaneously, the loop is separated from the supply roll. The respective packaged goods are thereby strapped.

Generic strapping devices are provided for mobile use, in which the devices carried by a user to the respective site and should not rely on the use of externally supplied supply energy. The energy required for the intended use of such strapping devices for tensioning a strapping band around any packaged goods and for producing a closure is generally provided by previously known strapping devices by an electric accumulator or by compressed air. With this energy, the belt tension introduced by means of the tensioning device onto the belt and a closure on the strapping belt are produced. Generic strapping devices are also intended to connect only weldable plastic straps together.

In mobile devices, a light weight is of particular importance in order to physically burden the users of the strapping device as little as possible when using the device. Likewise, for ergonomic reasons, the weight of the entire strapping device should be as uniform as possible, in particular in order to avoid concentration of the weight in the head region of the strapping device. Such a concentration leads to unfavorable handling properties of the device. In addition, a possible ergonomic and user-friendly handling of the strapping device is always sought. In particular, the possibility of operating errors and malfunctions should be as low as possible.

The invention is therefore an object of the invention to provide a generic, in particular a mobile, strapping device of the type mentioned above with high reliability, in which the intended tape tension can be applied safely and as possible slip on the tape. This object is achieved in a strapping device of the type mentioned according to the invention by an actuator of the strapping device, which is provided with a button / switch, with a switching state of a transmission of the strapping device is variable such that a drive movement of the drive means of the strapping device either for rotation of the Tensioning wheel or for pivotal movement of the rocker leads. Such a solution on the one hand has the advantage that the same gear both for the overb. Reduction of the drive provided by the drive device for the tensioning wheel available drive movement as well as for the driven movement of the rocker can be used and thus despite the convenient solution of a driven rocker, this no independent additional gear is required. Despite the increase in comfort and functional safety, there is no noticeable increase in weight. On the contrary, since the hitherto usual long lever for manual opening of the clamping device can be omitted, depending on the specific embodiment of the respective preferred strapping device according to the invention, weight reductions may even be possible with the invention. This advantage can be further increased in further preferred embodiments, if for each provided in the respective strapping driven movements the respective drive movement is provided by only one motor of the strapping device available, in particular by only one electric or by only one pneumatic motor.

A further embodiment of the strapping device can provide that in one of the switching states of the transmission driven by the drive means pivoting movement of the transmission to increase the distance between the tensioning wheel and the clamping plate performs.

A further embodiment of the strapping device can provide that with the button / switch two provided for acting on the transmission switching elements, such as terminals, are actuated, in particular at least substantially simultaneously actuated. A further embodiment of the strapping device can provide that with the button / switch switching elements are actuated, which are provided for acting on different transmission elements of the transmission. A further embodiment of the strapping device can provide that with only one button / switch of the actuating device - and in particular with only one actuation of the button / switch - the at least two switching elements can be actuated.

A further embodiment of the strapping device may provide that after a successful tensioning operation of the strapping band, an actuation of the button / switch leads to the reduction of the belt tension of the band section engaged with the tensioning wheel.

A further embodiment of the strapping device can provide that an actuation of the button / switch for generating the switching state of the transmission is also provided for triggering further functions of the strapping device, in particular for triggering the tensioning operation and / or for triggering the generation of the connection on the strapping band. A further embodiment of the strapping device can provide that an actuation of the button / switch is also provided for transferring the connecting device into its rest position and / or into its working position.

A further embodiment of the strapping device can provide that, in addition to the button / switch, whose operation leads to change the switching state of the transmission, at least one further key / switch is provided, in particular for triggering the tensioning operation and / or for triggering the generation of the connection on the strapping band. A further embodiment of the invention may provide, in addition to the key / switch whose operation leads to a change in the switching state of the transmission, and to a further key / switch which is provided to trigger the clamping operation, at least another button / switch is provided for triggering the generation of the connection on the strapping band. According to a further aspect of the invention, this also relates to a strapping device according to the preamble of claim 1, wherein the only one drive means, in particular the only one motor, can be triggered with an actuating device of the strapping device with which the tensioning wheel can be driven, with which the Connecting device can be moved into its working position, in which with the connecting device on the strapping the permanent connection can be generated, the energy is provided for the connection means for generating the permanent connection, and with the rocker for generating the distance between the tensioning wheel and the clamping plate is drivable.

In the invention may be provided in an expedient manner that at least temporarily during the transmission of the motor drive movement on the tensioning wheel, preferably as long as the tensioning wheel is engaged with the tape by means of at least one transmission means of the strapping a drive movement to the during the duration of Clamping operation is transmitted at least temporarily pivotable rocker, wherein the drive movement is provided for applying a torque to the rocker. According to the invention, the torque exerted on the rocker can be used to increase the contact pressure of the tensioning device against the strapping band. In a structurally simple solution, the torque exerted on the rocker by transmission means can originate from a motor whose drive torque is variable, the pressure force of the rocker against the belt in the course of the tensioning process increases. In this case, it is preferable if the motor-related increase takes place in such a way that it takes place above all during or after an increase in the band tension. It is advantageous in this case if, for the generation of the motor torque for the rocker, a motor is used which also carries out other drive movements. It is particularly advantageous if the motor and its drive movement is used with which the tensioning wheel is driven. On the one hand, a further motor can thereby be avoided, but nevertheless the function according to the invention can be exercised. On the other hand, with increasing belt tension usually also increasing engine torque can be used to increase the contact pressure. This allows in a structurally particularly simple way a variable, voltage-dependent pressing of the rocker against the belt. Preferably, the latter can be done in proportion to the applied band tension.

According to a further aspect of the invention, which also has independent significance, a torque can also be exerted and transmitted to the rocker, which is based on a force exerted on the tensioning device by the band at an engagement point of the band with the tensioning device. This force, which is a Reactio, the force applied by the driven tensioning wheel on the band clamping force can be tapped at a suitable location and transmitted with transfer agent on the rocker. In order to spend as little design effort here, preferably acting on the tensioning belt tensioning on the tensioning wheel itself can already be used. This can be used in particular as torque acting on the tensioning wheel in each case, which is introduced from the tensioning wheel into the transmission means of the tensioning device and transmitted by the latter to the rocker.

According to the invention can thus be provided in an advantageous manner that the motor drive movement for the clamping device, at least indirectly as Reactio, also used to use the motor driven by the rotational movement of the tensioning wheel and a pivoting movement of the rocker during the tensioning one of the with the Strapping band engaged tensioning wheel derived torque can be introduced by means of transmission means in the rocker to increase a contact force of the tensioning device against the belt.

In a preferred embodiment of the invention, a gear of the tensioning device with which a motor drive movement for the tensioning wheel is translated or translated, be part or all of the transmission means with which the force acting on the tensioning wheel and resulting from the belt tension force from the tape on the rocker is transmitted.

The invention can also be seen in a further aspect in that means are provided for the tape tension-dependent variable pressing of the tensioning wheel or the clamping plate to the strapping. The invention thus provides during the clamping phase, a band voltage-dependent variable pressing the clamping device against the strapping before.

In particularly advantageous embodiments of the invention, the belt tension generated by the clamping operation is thus used to increase in an advantageous manner with steadily increasing belt tension and the pressing force of the tensioning wheel and / or the clamping plate on the tape, thereby increasing in itself with increasing belt tension danger As the belt tension increases, so does the contact force of the tensioning wheel on the belt and the tensioning plate, thus allowing the invention in such embodiments to exert a high contact pressure force on the belt If the belt tension is already high and thus in the attempt to further increase the belt tension, the risk of slippage between the tensioning wheel and the belt is also particularly high ecting risk of slippage counteracted and thus the reliability and a fast-running strapping be ensured even at high belt tensions. Since the reaction of the strapping band to the actio, namely the introduced band tension, as well as transmission means are used, which are derived from the tensioning device, in particular from the tensioning wheel and transmitted to the rocker, it requires no intervention by an operator to achieve the inventive effect, the inventive effect is achieved automatically with advantage in the strapping device.

In a preferred embodiment of the invention, the transmission means, which advantageously represent an operative connection from the tensioning wheel to the rocker, comprise a pivotable mounting of the rocker at least during the tensioning operation and a rotatably mounted or rotatably mounted gear element, which is in operative connection with the tensioning wheel during the tensioning operation , The reaction force of the band is preferably used as torque and introduced into the rotatable or rotatable gear element, for example, a planet carrier of a planetary gear. The rotatable or rotatable transmission element should be supported against the rotary or rotary motion on a support element. The reaction force of Tensioning wheel can then be introduced via or due to the support in the rocker, whereby an additional torque acts on the rocker, which can be used to increase the pressing force of the rocker against the strapping. The transmission means may advantageously be wholly or partly part of the tensioning gear, with which a motor or derived from other Energiefzufuhr drive movement is passed at a suitable speed to the tensioning wheel.

In a particularly preferred embodiment of the invention, which also has independent significance, motor drive movements can be used with identical directions of rotation of only one motor, except for the drive of the tensioning wheel when tensioning the strapping band for raising the rocker. In addition, with the same drive movement and the band voltage-dependent variable pressing the tensioning wheel can be made to the exciting band. The dependence is in this case provided such that with increasing belt tension and the force exerted by the tensioning wheel contact force increases to the belt. As with increasing belt tension and the risk increases that slippage between the tensioning wheel and the belt takes place, the risk of slippage can be counteracted by the measure of an increasing contact pressure. It is particularly preferred in this case if the same direction of motor rotation is used as for clamping. The motor drive movement during clamping of the band can preferably be used in such a way that an opposing force acting on the tensioning wheel from the strapping band is used during the tensioning process of the strapping band by means of the tensioning belt engaging in the strapping band and against a belt tension in order to increase the contact pressure of the tensioning wheel tensioning wheel in the direction to increase the clamping plate.

According to a further aspect of the invention is to be possible with little design effort and ease of use, a resulting from the belt tension and retroactive in a transmission force can be held and released, with which a drive movement is transmitted to the tensioning wheel. A solution to this further aspect of the invention, which may have both in combination with the subject-matter of claim 1 and of independent significance, is described in claim 8. The invention thus relates to a locking device for use in a strapping device, with the a rotatable wheel can be clamped, which is provided for transmitting a drive movement, in particular a gear of a tensioning device of the strapping device. The inventive locking device should have at least one pivotable about a pivot axis and spaced from the wheel clamp body which is pivotable from a release position to a locked position in which he - preferably with a portion of an arcuate contact surface - in abutment against a substantially flat, ie formschlusselementenfreie, circumferential clamping surface of the wheel passes, wherein the clamping body has a pivot radius which is greater than a distance of the pivot axis of the clamping body to the peripheral clamping surface of the wheel, and the direction of rotation of the clamping body about the pivot axis in the transfer from the release position to a clamping position in opposite directions of rotation as the wheel to be clamped runs. With such a locking device can be achieved in a structurally simple way very reliable locking of rotating gears. The lock in the direction of rotation of the wheel can be maintained with little effort. The clamping force of the clamp body even increases automatically should an attempt be made to continue turning the wheel by increasing the torque.

The inventive locking device can be used with advantage in particular for releasably locking a wheel of a transmission, which belongs to a transmission with which a drive movement is to be transmitted to a tensioning wheel of the clamping device of a strapping device. It may be provided in this context, in particular for clamping a wheel of a planetary gear, with which the drive movement is to be transmitted to the tensioning wheel. With or at least with the aid of a clamping of the wheel to be clamped, one of at least two output directions of the transmission can be determined, in particular an output direction of the transmission to the tensioning wheel, so that the band can be tensioned.

It may also be advantageously provided that with a release of the clamping and the belt tension acting on the tensioning wheel and the transmission at least partially, preferably completely, is taken. Because with such Locking devices comparatively low release forces to cancel the clamping are required even at high tape tension values, arise with the invention particularly functionally reliable and easy-to-use strapping. The low operating and actuation forces also make it possible to dispense with a rocker lever, were previously generated with the previously high strains in prior art strapping devices for lifting the rocker from the strained band. Instead of a long rocker lever, a button or button can now be used, with the or the stress-releasing process takes place.

Further preferred embodiments of the invention will become apparent from the claims, the description and the drawings.

The invention will be explained in more detail with reference to embodiments shown purely schematically in the figures, in which:

1 shows a strapping device according to the invention in a perspective view;

1a shows a further example of a strapping device according to the invention;

Fig. 1 b yet another example of an inventive

strapping;

FIG. 2 is an exploded view of the tensioning device of the strapping device of FIG. 1 together with the motor; FIG.

Fig. 3 is a perspective view of the clamping and the

Locking device of the strapping device of Fig. 1;

Fig. 4 is a further perspective view of the clamping and the

Locking device of the strapping device of Fig. 1; Fig. 5 is an exploded view of another embodiment of the

Clamping device of the strapping device of Figure 1 together with the motor.

Fig. 6 is a perspective view of the clamping and the

Locking device of the strapping device of Fig. 1;

Fig. 7 is a further perspective view of the clamping and the

Locking device of the strapping device of Fig. 1;

Fig. 8 is a side view of the clamping device of FIG. 5, in which a

Rocker is in a first Schwenkendposition; a side view of the clamping device of Figure 5, in which the rocker is in a second Schwenkendposition. a side view of the clamping device of Figure 2, in which the rocker is in a position with high pressure against a clamping plate ..; a side view of the clamping device of Figure 2, in which the rocker is in a position with respect to Figure 10 lesser pressure against a clamping plate. a partial perspective view of the clamping and the locking device; a sectional view of the clamping and locking device; a schematic representation of the geometric relationships of a preferred locking device.

The exclusively manually operated strapping device 1 according to the invention, shown in FIGS. 1 and 2, has a housing 2, which is the mechanism of the strapping device surrounds and on which a handle 3 for handling the device is formed. The strapping apparatus is further provided with a base plate 4, the underside of which is provided for placement on an object to be packaged. On the base plate 4 and connected to the base plate not shown carrier of the strapping device all functional units of the strapping device 1 are attached.

With the strapping device 1, a not shown in Fig. 1 loop of a plastic tape B, for example, polypropylene (PP) or polyester (PET), which was previously placed around the article to be packaged by means of a clamping device 6 of the strapping device. The clamping device has for this purpose a tensioning wheel 7, with which the band B can be detected for a clamping operation. The tensioning wheel 7 is arranged on a pivotable rocker 8, which can be pivoted about a rocker pivot axis 8a. The clamping wheel 7, which is arranged with its axis of rotation at a distance from the rocker pivot axis 8a, can be transferred by a pivoting movement of the rocker 8 about the rocker pivot axis 8a from an end position spaced from a preferably curved clamping plate 9 attached to the base plate 4 to a second end position the tensioning wheel 7 is pressed against the clamping plate 9. By a corresponding motor-driven movement in the reverse direction of rotation about the rocker pivot axis 8a, the tensioning wheel 7 can be removed from the clamping plate 9 and pivoted back to its original position, whereby the belt located between the tensioning wheel 7 and the clamping plate 9 is released for removal. In use of the illustrated embodiment of a clamping device are two layers of Umreifungsbands between the tensioning wheel 7 and the clamping plate and are pressed by the tensioning wheel 7 against the clamping plate. By rotation of the tensioning wheel 7, it is then possible to provide the belt loop with a sufficiently high for the packaging purpose tape tension. The process of clamping and this purpose designed advantageously clamping device and rocker 8 will be explained in more detail below.

Subsequently, at one point the band loop, on which two layers of the band lie one above the other, can be welded in a manner known per se two layers done by means of the friction-welding device 12 of the strapping device. The strap loop can thereby be permanently closed. In the preferred embodiment shown here, the Reibschweiss- and separator 12 is driven by the same only one motor M of the strapping, with all other motor-driven movements are performed. For this purpose, in a manner known per se in the transmission direction from the motor M to the points at which the motor drive movement provided in detail not shown in detail freewheel, is effected by the fact that the drive movement in the respectively provided driving direction of rotation to the corresponding functional unit of the Strapping device is transmitted and in the respectively provided other driving direction of rotation of the motor no transmission takes place.

For this purpose, the friction-welding device 12 is provided with a welding shoe 13 shown only in a highly schematized manner, which is transferred by means of a transfer device 14 from a rest position with distance to the belt into a welding position in which the welding shoe is pressed against the belt. The hereby pressed by mechanical pressure on the strapping band welding shoe and the simultaneous taking place oscillating movement of the welding shoe with a predetermined frequency, melts the two layers of Umreifungsbands. The locally plasticized or melted areas of the band B flow into each other and after cooling of the band B then creates a connection between the two band layers. If necessary, then the belt loop can be separated from a supply roll of the tape by means of a cutting device of the strapping device 1, not shown.

The delivery of the tensioning wheel 7 in the direction of the clamping plate 9, the rotary drive of the tensioning wheel 7 about the clamping axis 6a, the lifting of the tensioning wheel from the clamping plate, the delivery of the friction-welding device 12 by means of the transfer device 14 of the friction-welding device 12 as well as the use of the friction-welding device 12 in itself and the operation of the cutting device are carried out using only a single electric motor M, which provides a drive movement for these components of the strapping device. For the power supply of the motor M is on Umreifungsgerät a replaceable and removable in particular for charging and interchangeable Accumulator 15 is arranged, which serves for the storage of electrical energy. The supply of other external auxiliary energy, such as compressed air or other electricity may be provided, but does not occur in the strapping apparatus according to FIGS. 1 and 2.

As shown in Fig. 4, the strapping device according to the invention is provided to tap off at two points of the drive axis of the motor M its drive movement either for the clamping device 6 or for the friction-welding device 12. The motor M can be operated in each of the two directions of rotation. The change of the transmission of the drive movement to the clamping device 6 or the friction-welding device 12 is effected by a arranged on the drive shaft of the motor M (and not shown) freewheel automatically in response to the direction of rotation of the drive shaft of the motor. In one direction of rotation of the drive shaft, the drive movement is transmitted to the clamping device 6. Due to the freewheel, the friction-welding device 12 experiences no drive movement here. In the other direction of rotation, the clamping device 6 without drive movement and the friction-welding device 12 is driven. Any manual switching operations are not required to change the transmission direction of the motor drive movement in this embodiment. Such freewheels are already known in connection with strapping, which is why will not be discussed in detail.

As also shown in Fig. 4, the motor transmission of the drive movement takes place on the friction-welding device 12 and transfer device 14 by suitable means. This may be, for example, a toothed belt drive with a ring-shaped closed timing belt, which is guided over two gears. One of the two gears is arranged on the drive shaft of the electric motor M, the other belongs to a transmission of the friction-welding device 12, with which the motor drive movement moves both the transfer device 14 and the welding shoe 13 of the friction-welding device 12. The welding shoe, which is pressed onto two superimposed layers of the strapping band, can hereby be set into an oscillating movement with a predetermined frequency and amplitude, with which the Both band layers are locally melted in the area of the welding shoe and welded together by the subsequent cooling.

On the drive shaft of the motor is seen from the motor M behind the toothed belt drive to the welding device, a bevel gear 19, which also belongs to a bevel gear of the clamping device, such as a second bevel gear 20, with which it meshes. On the same shaft on which the second bevel gear 20 is arranged, there is also a first gear 21 of a further toothed belt drive 22, which is also guided via a second gear 23. The first gear 21 of the toothed belt drive 22 is rotatably mounted on the shaft 24.

On the other end of the shaft 24, the rocker 8 of the strapping device is pushed, which is part of the tensioning device 6 and the tensioning wheel 7 and a tensioning wheel 7 upstream gear, here a planetary gear 26 carries, for which purpose 8 suitable bearings can be provided on the rocker , The rocker 8 is pushed onto the shaft 24 such that it is arranged and supported pivotably about the longitudinal axis of the shaft 24. The longitudinal axis of the shaft 24 is thus simultaneously the rocker pivot axis 8a, about which the rocker 8 is pivotable. The planetary gear 26 may be formed as a single or multi-stage planetary gear, in particular as a two- or three-stage planetary gear. From an end face of the gearwheel 23 facing the tensioning wheel 7, there is an input-side externally toothed sun gear 30 belonging to the planetary gear 26, whose axis of rotation is identical to the axis of rotation 6a of the input-side gearwheel 23. On a shaft of the gear 23, on which in the embodiment, the sun gear 30 is formed, is a freewheel 45, which allows only one direction of rotation of the sun gear 30, namely the direction of rotation, which is provided for driving the tensioning wheel. The sun gear 30 is passed through a ring gear 27 and through a central recess of a planetary carrier 25, which are also part of the planetary gear 26. Seen from the input side of the planetary gear, the planet carrier 25 is disposed behind the ring gear 27 on the axis of the planetary gear 26, which corresponds to the clamping axis 6a. The planet carrier could also be designed so that it represents a clamp, clutch or spur gear. The ring gear 27 has on its outer circumference on a cam 27 c, which is in engagement with a fortified on the base plate 4 of the strapping device 46. The internally toothed ring gear 27 is supported here in such a way that the cam 27c can make slight relative movements within its engagement in the support 46, for example in a recess 46a of the support. The ring gear 27 also has an annular shoulder 27a, on which a roller bearing 28 for supporting the planetary gear 26 is arranged. The planet carrier 25, whose axis is aligned with the clamping axis 6a, stands with its three planetary gears 25b in engagement with an internal toothing of the input-side ring gear 27 of the planetary gear 26. The planetary gears 25b of the planet carrier 25 are also in engagement with the sun gear 30 of which they have a Incorporate drive movement and can transmit to the ring gear 27 and appropriately stocky. With rotationally fixed arrangement of the planet carrier 25, a rotational movement of the sun gear 30 can thus be converted into a rotational movement of the ring gear 27. In the embodiment, a first terminal 29 of a locking or clamping device is designed as a pivotable cam, which can be brought into contact with a clamping surface 25a on the outer circumference of the planet carrier 25 or pivoted away from it at a distance. The cam is in this case arranged so that upon contact of the cam with the clamping surface 25a by a rotation of the input side planetary carrier 25 in the direction of rotation provided for the planet carrier 25, the clamping effect is further enhanced. By advancing the cam on the clamping surface 25a due to a corresponding switching operation, the planet carrier 25 can be blocked against rotation. By also a switching operation, the cam 29 can be removed from the clamping surface 25a and thus the planet carrier 25 are released for rotational movements. The switching process can in this case trigger a pivoting movement of the terminal 29 about a switching axis 143, which is triggered by pressing a button 144.

The sun gear 30 is also arranged in the region of the axis of rotation 31 of a ring gear 32, the non-toothed outer surface 32a of a second terminal 33 is associated. The rotation axis 31 is identical to or aligned with the clamping axis 6a. The cooperating with the outer surface 32a clamp 33 can in principle the same way as the first terminal 29 may be formed as a switchable cam which can be moved between two end positions, wherein in one position, the ring gear 32 is blocked against rotation and released in the other position for rotational movements. Furthermore, an internal toothing of the ring gear 32 is in engagement with three planetary gears 34, which are mounted on the end facing the ring gear 32 of the following planetary carrier 35. The planet gears 34 of the planet carrier 35 are also in engagement with the sun gear 30 of the input-side gear 23, which projects into the ring gear 32. The locking device is designed in the described preferred embodiment such that always one and only one of the wheels 25, 32 clamped against rotation and the respective other wheel 25, 32 is free for rotational movements. It is thus possible, depending on the positions of the locking devices 29, 33, that a rotational movement of the gear 23 and the sun gear 30 either to a rotation of the planet carrier 35 about the clamping axis 6a and rotation axis 31 due to movement of the planetary gears 34 in the internal toothing of the ring gear 32nd leads. Or the rotation of the sun gear 30 leads in dependence of the positions of the locking device to a rotation of the ring gear 32. If the planet carrier 25 is not clamped by the locking device, the rotating sun takes the planetary gears 25b so that the planet carrier 25 rotates and the ring gear 27th remains stationary. If, however, the ring gear 32 is not clamped, a rotation of the sun gear 30 leads to entrainment of the planet wheels 34, which in turn offset the ring gear 32 in a rotational movement. Since the resistance to rotation in the further course of the planetary gear 26 to the tensioning wheel 7 is greater than the torque to be overcome to enable the ring gear 32 in rotation, rotates in this case, especially the ring gear 32 and the tensioning wheel 7 rotates at least substantially Not.

On the other, facing the tensioning wheel 7, end face of the planetary carrier 35 is non-rotatably arranged on this another sun gear 36 which meshes with planet wheels 41 of another planetary carrier 42. A directed to the tensioning wheel 7 further and rotatably connected to the planet carrier 42 sun gear 43 is performed by a recess formed as a ring gear further planetary carrier 37. The sun gear 43 is in meshing engagement with the tensioning wheel. 7 turned planetary gears 38 of the other planetary carrier 37. The planet gears 38 of the second planetary carrier 37 in turn mesh with an internal toothing of the tensioning wheel 7 and drive the latter to its rotational movement about the clamping axis 6a. This rotational movement of the tensioning wheel 7 provided on its outer peripheral surface with a fine toothing (not shown) is used to grasp with the peripheral surface the band B and to withdraw the band of the band loop, whereby a band tension in the band loop is increased.

The third planet carrier 37 has on its outer surface on a shoulder 37 a, which can be brought by a rotational movement against a stop member 39 in contact. The stop element 39 itself is not fixed to the rocker but to the base plate 4 or other support, which does not participate with the rocker 8 in its pivoting movement. The stop element 39 is thus stationary with respect to the paragraph 37 a.

When used in the strapping of packaged goods, the strapping device 1 behaves as follows: After the respective packaged goods a belt loop is laid with a commercially available plastic strapping, this is inserted in the Bandumreifungsgerät in the band end, in which the belt loop is partially double-layered, in The end of the tape is held in the strapping device with a strap clamp (not shown). A portion of the band B immediately adjacent to the band loop is laid over the tensioning plate 9 of the tensioning device 6 in a double-layered manner. The rocker 8 with the tensioning wheel 7 and the upstream gear 26 is in this case in its upper end position in which the tensioning wheel 7 is arranged at a distance (with its largest intended distance) to the clamping plate 9, resulting in the largest possible opening gap, the one simple, comfortable and thus a quick insertion of the tape in the clamping device allows. Subsequently, the rocker is lowered to a clamping wheel 7 opposite clamping plate 9 and pressed against the arranged between the clamping plate 9 and the tensioning wheel 7 band. Both this transfer movement of the tensioning wheel and the height of the force exerted by the tensioning wheel on the belt at the beginning of the tensioning operation can be generated in the described embodiment of the invention by one or more prestressed spring elements 44 (not shown). By pressing a button 10 the spring element can be released and the entire strapping process can be triggered with its successively executed "clamping", "closure production", "cutting", releasing the tension from the band in the region of the clamping device, and "lifting the rocker". It is possible to provide embodiments of the invention in which then preferably no further intervention by the operator of the strapping device must be made. In the illustrated embodiment, however, is for starting the process "release the voltage from the band" another actuation of another button required, in the exemplary embodiment, the key 144. In the preferred embodiment is here with the mechanically acting rocker button 144 on the locking device with its two terminals 29th , 33 acted and these engaged in or out of engagement with the planetary gear.

After the tensioning wheel 7 automatically from the open position to its clamping position (see clamping position in Fig. 10 and open position in Fig. 11), in which it rests on the belt B and presses over the belt on the clamping plate 9, the motor Drive movement transmitted to the tensioning wheel 7. Now, the second clamp 33 is transferred to its position in which it presses against the ring gear 32. The ring gear 32 is thereby locked against rotation and locked. The first terminal 29, however, continues to be positioned at a distance from the input-side planet carrier 25 and releases the ring gear 27 for rotational movements. The motor drive movement, which is transmitted due to the intended direction of rotation of the motor M via the bevel gear 19, 20, 21 to the second toothed belt drive 22 and thus to the gear 23, passes from here in the order of the following gear members via the input-side gear 23rd , the sun gear 30, the planetary gears 34, the sun gear 36, the planet gears 41, the sun gear 43 and the planetary gears 38 on the tensioning wheel 7. The tensioning wheel 7 can inter alia by the multi-stage planetary gear in strong understated rotational movement of the engine - and thus at Need with a correspondingly high torque - are driven in the predetermined direction of rotation.

In just described operating state "clamping" of the strapping produced by the driven, with the band engaged tensioning wheel 7 depending on the resistance resulting from the belt tension and acting in response to the tensioning wheel 7, the tensioning wheel 7 a corresponding in opposite Directional counterforce. This counterforce acts in the reverse direction of transmission as the motor drive movement, all involved in the transmission of the drive motion gear members of the multi-stage planetary gear. If a different type of transmission is used as a single or multi-stage planetary gear, it is also on this from the already applied belt tension resulting and introduced via the contact with the tensioning wheel in the respective gear counterforce for use in the context of the present invention at the disposal , According to the invention, this counterforce can be used to improve the process conditions, in particular the functional reliability, even at high belt tensions to be applied. In order to use this counterforce for the purpose described below, it would thus be possible in principle to use each of these gear members for this purpose, in particular to tap off and use said counterforce on each of these gear members. In the exemplary embodiment, the planet carrier 37 is used for this purpose. The planetary carrier 37 is in this case supported on the base plate 4 via the abutment element 39, as a result of which the entire clamping device 6 about the rocker axis 8a is pressed onto the belt in proportion to the resistance force (belt tension). The tensioning wheel 7 is thus pressed proportional to the belt tension on the belt B. The belt tension generated by the tensioning process is used to increase in an advantageous manner with steadily increasing belt tension and the pressing force of the tensioning wheel 7 on the belt B, whereby the increasing in itself with increasing belt tension danger of "slipping" or slippage of the tensioning wheel 7 counteracted during the clamping process.

The planet carrier is for this purpose formed with the engagement element 37a, which cooperates with the stationary stop element 39. The formed as a cam and arranged on the outer periphery of the planet carrier and of this substantially radially projecting engagement element is supported on the stop element 39 from. As can be seen, inter alia, from FIG. 3, the fixed stop element 39 is located in the region of the head end of the strapping device for this purpose. The stop element 39 is located in the embodiment shown on the one side, namely the head end, the clamping axis 6a and the rocker pivot axis 8a extending substantially parallel to it on the other side of the clamping axis 6a. The Rocker 8, on which the planet carrier 37 is rotatably arranged about a roller bearing about the clamping axis 6a, is also at least during the clamping operation pivotally, that is not blocked against pivoting movements but released for this purpose. In addition, the planet carrier 37 is rotatable about the clamping axis 6a during the clamping operation. The belt tension generated in response to the tensioning operation in the band B causes one of the tensioning operation provided in the direction of rotation of the tensioning wheel opposite force on the tensioning wheel 7. This reaction force acts from the tensioning wheel on the planet carrier 37 on the rocker 8 as directed to the rocker pivot axis 8a torque through that the planet carrier 37 is pressed with increased force against the tape in the direction of the clamping plate 9. The higher this is the band tension already introduced into the band, the higher is the result and from the further torque acting on the tensioning wheel 7 resulting motor drive movement torque. This torque, which is produced as a reaction, is in turn proportional to the resultant pressing force acting on the band B by the tensioning wheel 7, with which the band B is pressed by the tensioning wheel 7 against the tensioning plate 9. A rising from the motor drive movement on the tensioning wheel 7 belt tension is therefore associated in the invention with an increasing pressing force of the tensioning device on the band. After completion of the clamping operation and the subsequent welding process for shutter formation and after a successful motor driven cutting process by a not shown in the strapping integrated, cutting device, a complication-free and fast removal of the tape from the strapping device should be possible. To achieve this, a motoric lifting movement of the tensioning wheel 7 is provided from the clamping position. For this purpose, the key 144 is actuated and as long as the key 144 is actuated, the rocker remains in the open position, in which a sufficient distance between the clamping plate 9 and the tensioning wheel 7 is created. By releasing the button 144, the rocker is closed, for example by spring force.

In the exemplary embodiment, the operative connection between the electric motor M and the tensioning wheel 7 is first of all solved and an operative connection between the electric motor M and the rocker 8 is created. This is done by switching the terminals 29, 33 reached. The previously existing clamping of the ring gear 32 is canceled by the second clamp 33 is removed from the outer surface 32 a of the ring gear 32 and thereby releases the ring gear 32 for rotational movements. At substantially the same time or immediately thereafter, the first clamp 29 is lowered onto the clamping surface 25a of the planetary carrier 25 and brought into clamping engagement therewith. As a result, the input-side planetary carrier 25 is fixed and locked against a rotational movement about the clamping axis 6a, along which the entire planetary gear is located. This switching operation is carried out by pressing the rocker button 144. For this purpose, the rocker button 144 can be brought into a different than the previously assumed switching state, which thus can have a total of at least two different switching states.

The tensioning wheel 7 can thereby rotate freely without drive and has no operative connection to the electric motor M and the sun gear 30 more, which could transmit a drive movement. A drive movement of the electric motor M with the same direction of rotation as in the clamping operation is now used due to the blocking of the input side planetary carrier 25 of the planetary gear to the planetary gears 25b of the spur gear 25 take the input-side ring gear 27 during its rotational movement. The input-side ring gear 27 thus performs a rotational movement due to the rotating planetary gears 25b. The system and support of the ring gear 27 on the support element 46 leads to a pivoting movement of the ring gear 27 about the rocker axis 8a. The input-side ring gear 27, which is also non-rotatably connected to the rocker 8 due to the clamping, takes the rocker 8 with it during this movement. This leads to an increase in the rocker 8 and attached to her clamping device 6 including the tensioning wheel 7. The rotational movement of the rocker 8 may be limited by a stop or Endpositionsgeber, the motor M after reaching an end position in the open position of the rocker. 8 switches off and triggers a locking of the rocker. By the motoric lifting movement of the rocker 8 against the effective direction of the spring element 44 and the spring element 44 is provided again with an increased biasing force. The strapping B can now be removed from the strapping device 1. The strapping device is now ready for a subsequent new strapping, which can be done in the same manner as the strapping described above. For subsequent lowering of the rocker 8 after introduction of a new section of the strapping B in the strapping device 1, the spring element 44 must be released again, which can be done for example via an operable button on the strapping device. In the exemplary embodiment, the previously actuated key 144 is released for this purpose. The spring force then pivots the rocker 8 in now reversed pivoting direction to the clamping plate and clamped for the subsequent clamping operation, the band with an initial pressing force between the tensioning wheel 7 and the clamping plate 9 a. The variable in the course of the clamping operation pressing force increases as described.

The operation of the tensioning device 6, the delivery of Reibschweisseinnchtung 13 by means of a transfer device of the Reibschweisseinnchtung 13 and the use of Reibschweisseinnchtung itself and the operation of the cutting device carried out using only a common electric motor 14, which provides a drive movement for each of these components , The constructive solution provided for this purpose can in principle correspond to that described in WO2009 / 129634 A1, the disclosure content of which is hereby incorporated by reference.

In the present case, the portable mobile strapping device 1 has a trained as a pressure switch actuator 10 which is provided for starting the engine and is hereinafter referred to as a tension button. For the actuating element 10, three modes can be set by means of a mode switch according to the invention of a mode switch contained in the operating and display panel 25. In the first mode, subsequent actuation of the actuator (button) 10, without requiring further operator action, sequentially and automatically triggers both the tensioning device 6 and the friction-welding device 13. To set the second mode, the mode switch not shown in a second switching mode is switched. The switching state of the mode switch is shown with its adjustable modes as well as the switching state of the actuator 10 in the display panel and displayed. In the second possible mode is then triggered by pressing the button (tension button) 10 only the tensioning device 6. For separate triggering of the friction-welding device 13, the tensioning button 10 must be actuated a second time by the operator, in the exemplary embodiment with a double-click of the tension button 10. The third mode is a kind of semi-automatic, in which the provided as a tension button 10 actuator is to be pressed until the pre-settable clamping force or tension in the band is reached. In this mode, it is possible to interrupt the clamping process by releasing the tensioning key 10, for example, to attach edge protectors to the Umreifungsgut under the strapping. By pressing the tension button 10, the clamping process can then be resumed. This third mode can be combined with a separately triggered as well as with an automatically subsequent friction welding process. The power supply is ensured in each case by the rechargeable battery 15 designed as a lithium-ion battery.

In the execution of a closure formation, after the band has been laid around the packaged goods as a loop, it is guided in a two-layered manner in a predetermined manner through the tensioning device 6 and through the closure device in two layers. In other embodiments of strapping devices can also be provided that the tape is guided in one layer through the clamping device. By engagement of the tensioning device 6 in the guided by the tensioning device 6 upper layer of the tape and by a retraction movement of the tape, the intended tape tension is applied. Thereafter, the welding shoe 13 is lowered in the direction of a counter surface of the base plate 4. Depending on the operating mode of the strapping device 1, this is done automatically as a result of the completed clamping operation or due to a separate triggering of the friction welding operation by pressing the button provided for this purpose. During the Reibschweissvorgangs the band is still clamped between the tensioning wheel 7 and the clamping plate (Spanngegenhalter) 9 and is held there during the closure formation. The clamping device has during this process section of the Umreifungsbildung the function of a belt clamp or a clamping device which clamps the band between them with two cooperating clamping elements. By lowering the welding shoe 13 the two tape layers passed through the closure device are pressed against each other and against the counter surface.

Different information and touch-sensitive actuating or input elements can be displayed alternately or simultaneously on the display and control surface 25a. Different display and input levels can be provided which can be selected and deselected and in which different information as well as actuating and input elements can be displayed. In particular, the displayed items may inform about the condition and settings of the strapper and its components. As actuators, in particular a plurality of contact-triggerable further keys of the operating surface 25a can be displayed. Use these buttons to pre-select and adjust the various Manual (MAN), Semi-automatic (SEM) and Auto (AUTO) modes of the strapping tool, as well as strapping parameters. Adjustable and displayed parameters can be, for example, the clamping force, the welding time and the cooling time. The adjustment can be made by adding or subtracting predetermined increments of the respective value by pressing plus or minus buttons and by confirming the value to be set by means of the mode switch which in this case serves as confirmation button. By operating the mode switch 17, the set value is stored in the controller to be used in the subsequent strapping operation. Likewise, the type of tape used may be displayed and selected by selection from a given list of tape types 26. Furthermore, current operating conditions can be displayed, for example, the discharge state of the battery and during the clamping operation by a progress bar the proportion of already achieved clamping force, based on the set to be reached clamping force.

The values preset in this way are displayed by the strapping device on the display panel and used during the strapping processes until the parameter values are changed again. The strapping processes themselves are triggered or started by the tensioning button 10 arranged ergonomically in the region of the front end of the handle of the strapping device 1 as a further actuating element. To insert the tape in the clamping device is below the Clamping button 10, the rocker button 144 arranged, which may be formed, for example, and preferably as a push button. By pressing the rocker button 144, the rocker 8 is opened, ie the rocker is pivoted away with its clamping plate 23 from the tensioning wheel 7, so that there is a gap between the clamping plate 23 and the tensioning wheel 7. As long as the rocker button 144 remains depressed, the clamping plate 23 of the rocker is arranged at a distance from the tensioning wheel 7, so that the band between the tensioning plate 23 and the tensioning wheel 7 can be inserted into the tensioning device. As soon as the rocker button 144 is released, the rocker 8 pivots with the clamping plate 23 in the direction of the tensioning wheel 7, as a result of which the clamping plate 9 abuts against the lower side of the band and the upper side of the band against the tensioning wheel 7.

The rocker button 144 operated at the end of a strapping operation inter alia to remove the strap from the strapping device also causes a release of tension between the tensioning wheel 7 and the strap and subsequently to a movement due to the previously described change or cancellation of the operative connection between the motor and the tensioning wheel a motorized movement generated distance between tensioning wheel 7 and clamping plate 9. In the exemplary embodiment, the voltage release is a consequence of the mechanical switching operation of the terminals 29, 33 on the planetary gear. This process takes place independently of whether the key 144 is designed as a separate key or a key with which further operations of the strapping apparatus 1 can also be switched.

If the Umreifungsgerat 1 held on the handle 3, the tension button 10 can be operated with the thumb of the hand with which the handle 3 is held. The arranged on the underside of the handle 3 rocker button 44 can be operated in this case in an ergonomically favorable manner with the index finger, without requiring a grasping is required. In other embodiments according to the invention, the rocker button 144 can also be arranged on the upper side of the strapping device, in particular in the immediate vicinity of the tensioning button 10, so that both the cocking button 10 and the rocker button 144 can be actuated with the thumb of the hand grasping the handle 3. The tensioning button 10 may in this case be responsible for triggering the tensioning as well as the welding operation, wherein it may be provided by setting the corresponding mode that a one-off Pressing the tension button 10 triggers both the clamping and the subsequent connection process. By selecting a different operating mode, only the clamping operation can be started by a single press of the tension button. To carry out the connection or the welding operation then a further pressing of the tension button 10 is required, for example with a double-click.

In an alternative embodiment shown in Fig. 1 a can be provided on the strapping device 1, in particular in the region of the handle, also (only) a combination button 10 having two operating areas, one for the clamping and welding and one for the rocker actuation. A separate rocker button, as it is provided as a rocker button 144 in the embodiment of FIG. 1, can be omitted in the embodiment of FIG. Nevertheless, here also the clamping and welding process can be triggered either by only one operation or by separate separate actuation operations of the one operating range of the key 10. The clamping operation can be triggered by a single operation and the connection process by a subsequent operation subsequent to the clamping operation, in particular by a double-click. The other operating area is provided for the rocker actuation. Such a combination key may, for example, be located at least approximately at the location of the strapping apparatus on which the tensioning key 10 is arranged in FIGS. 1 and 2. The various actuation areas 10a, 10b of the combination key 10 may, for example, be different end areas of the combination key.

In a further alternative embodiment, in particular in the region of the handle 3, a separate key 10, 144, 145 may be provided for each of the three functions. In this case, only a single actuation of the respective button 10, 144, 145 may be required to trigger the respective process. As shown in the corresponding embodiment of Fig. 1 b, the key 10 is provided in its operation to trigger the clamping operation, trigger the transfer device 14 for the transfer of the connecting device in its working position and back to its rest position, and the Verbindungsseinrichutng for generating the connection on the strap to trigger.

In yet another of several other embodiments, with a separate button 145 only the connection process, here the welding process, are triggered while all other operations on the strapping apparatus are to be triggered by just another button 10 or button 144, in particular the tensioning operation as well as the movement of the Rocker and the tension release. The actuation of the key 10 or the key 144 of these embodiments can be actuated only once or multiple times.

In all embodiments, it is preferred that the keys associated with the clamping and welding operations initiate electrical switching operations which are fed to the controller. The actuation of the rocker button 144, however, can preferably be forwarded electromechanically to the rocker and trigger a pivoting operation of the rocker. Likewise, one or more additional drive elements can be provided, which trigger the pivoting operation of the rocker and perform and are electrically controlled. All embodiments of the described operating concepts can also have independent significance and represent independent inventions.

FIGS. 5 to 9 show a further exemplary embodiment of a strapping device according to the invention. With regard to its external appearance, this too can correspond to the representation of FIG. The basic construction of this embodiment of the strapping apparatus may also correspond to that of the preferred embodiment according to the invention discussed above. Accordingly, in this embodiment, only a motor M is used, which is provided not shown in Fig. 5 welding device 12 and separating device on the one hand in one of the two engine rotation directions and the tensioning device 6 on the other hand in the other direction of motor rotation. The optional drive of either the welding device and separator on the one hand or the tensioning device 6 on the other hand via a freewheel and different directions of rotation of the motor M. Likewise, the embodiment has a pivotable rocker 80 of the tensioning device 86 that is motor-driven about a rocker pivot axis 80a. In contrast to the preferred embodiment discussed above, not the tensioning wheel 87 but the tensioning plate 89 is arranged here on the pivotable rocker 80, whose rocker pivot axis 80a extends parallel to the tensioning axis 86a. The motor drive movement with the direction of rotation, which is used for rotational movements about the clamping axis 86a, is also used in this embodiment for pivotal movement of the rocker 80. The rocker pivot axis 80a extends also in this embodiment substantially parallel to the clamping axis 86a, around which the tensioning wheel is rotatably mounted. The rotational movement of the motor is transmitted via a bevel gear pair 99, 100 to a planetary gear 106 behind a point at which the motor drive movement is used for the welding device and passed from this to the tensioning wheel 87. With one arranged on the shaft of an input side sun gear 1 10 freewheel 125 ensures that the input side of the planetary gear 106 can rotate only in one direction of rotation. The planetary gear 106 is provided with gear elements, which can be selectively locked as in the preferred embodiment described above by means of one of two terminals 29, 33 having locking means whereby the drive movement can be transmitted either to the tensioning wheel 87 or the rocker 80.

To open the tensioning device 86, the ring gear 107 is released via the locking device, ie the clamp 33 is not in clamping engagement with the ring gear 107. The tensioning wheel 87 can thereby rotate freely without active connection with the motor M. Optionally from the just preceding tensioning process from the strapping B to the tensioning wheel 87 retroacting belt tension is thereby achieved by the tensioning wheel 87 and the tensioning wheel upstream gear 106. With the terminal 29 designed as a planet carrier 105 spur gear is locked, whose axis of rotation with the clamping axis 86a, that is, the axis of rotation of the tensioning wheel 87, aligned. The transmitted from the bevel gear 100 on the input side sun gear 1 10 motor drive movement can not due to the made by means of the terminal 29 detachable rotary locking of the planet carrier 105 a rotation of the Pianetenträgers 105 but to rotational movements of the planetary gears 105b of the planet carrier 105. The standing with these planetary gears 105b internal teeth of the ring gear 109 puts the latter in rotational motion. As can be seen in particular in FIG. 7, an outer toothing 109c of the ring gear 109 is in engagement with an external toothing 150c of a circular arc segment 150, which is arranged stationarily on one end of a connecting shaft 151. The connection axis 151a of the connection shaft 151 runs parallel to the stationary clamping axis 86a of this embodiment. Instead of the two external gears 109c, 150c, the ring gear 109 could also be supported by a cam on a support element, in which case either the cam or the support element neither fixed to the ring gear 109 still formed movable and the other of the two element should be disposed on the ring gear 109. The rotational movement of the ring gear 09 and the engagement of the ring gear 109 in the circular arc segment 150 leads to a rotational movement of the connecting shaft 151 about the connecting axis 151 a. A arranged at the other end of the connecting shaft 151 spur gear 152 engages in an external toothing 1 17c of the planet carrier 117 and thereby transmits the rotational movement about the connecting axis 15 a on the planet carrier 117. With respect to the clamping axis 86a is the connecting axis 151 a on the one and the rocker pivot axis 80a on the other side of the clamping shaft 86a, with the rocker pivot axis 80a on the side of the head end of the strapping apparatus. The planet carrier 1 17 belongs to the drive train, which is provided for the drive movement of the tensioning wheel 87. The operative connection of this drive train to the motor M is momentarily interrupted due to the previously described switching position of the blocking device. Thus, there is no operative connection of the motor M with the tensioning wheel 87 at the method time described above, in order to drive the latter. As a result of the transmitted to the planet carrier 1 17 rotary motion, the planet carrier 1 17 rotates about the clamping axis 86a and takes with a arranged on its outer peripheral surface cam 1 7a a driver 80c of the rocker 80 with. The arcuate rocker 80, which is arcuate in plan view, thereby rotates and is opened. The rocker 80, which is mounted rotatably about the rocker axis 80a and approximately has the shape of a curved section, is arranged with its lower free end underneath the tensioning wheel 87, so that the tensioning plate 89 arranged in the region of the free end of the rocker 80 is likewise arranged directly underneath the tensioning wheel 87 can. To arrange the clamping plate 89 at a distance from the tensioning wheel 87, the previously described motor-driven movement of the rocker 80 in the direction of rotation according to arrow 1 12 (FIG. 6) is used, through which the rocker 80 is opened as described and a distance between the tensioning wheel 87 and the clamping plate 89 is increased. The opening movement can be limited by a stop. The motor-open rocker 80 now allows removal of the strained and closed strapping loop from the strapping device. After the finished strapping is removed, the end of a new strapping loop may be inserted between the tension plate and the tensioning wheel for a subsequent tensioning operation. The rocker 80 can be brought back by the restoring force of the previously tensioned during the opening movement of the spring element 124 to the tensioning wheel and press the band against the tensioning wheel with a pressing force initially for the clamping operation. In order to use the spring force and thereby move the rocker 80 in the direction of rotation according to arrow 113 in the direction of the tensioning wheel 87, an actuation of a button or other actuating element may be provided by which the spring force is released to act on the rocker. It may also be a release of the key 10. To clamp the belt arranged between the tensioning wheel 87 and the clamping plate 89 Umreifungsbands B, the ring gear 107 is clamped on its outer peripheral surface by means of the clamp 33 against rotational movements. The planet carrier 105 is not clamped, thus can rotate as well as the connecting shaft 8. The sun gear 30 in the arranged on the clamping axis 86a planetary gear 106 motor drive movement is transmitted through the planet carrier 105 and the ring gear 107 through the planet gears 1 14 of the second planetary carrier 1 15 and the latter set in rotation. A not visible in the illustration of FIG. 5 sun gear drives the planetary gears 121 to a downstream further stage of the planetary gear 106. Also, the planet carrier 122 of this stage rotates. The Sun gear 123 of the latter stage is passed through the other planet carrier 117 and drives the planet gears 118 of this further stage, which in turn are in engagement with an internal toothing of the tensioning wheel 87. The tensioning wheel 87 is thus driven via the single or multi-stage planetary gear 106 in the clamping direction and the inserted band B is tensioned.

In the above-described operating state "clamping", in which the tensioning wheel 87 engages with the band B, a resistance force acting from the band B on the rotating tensioning wheel 87 in the form of a restoring moment arises due to the band tension, whose magnitude is variable and proportional to the magnitude of the In the exemplary embodiment, the planetary carrier 117 is supported on the rocker 80 by a cam 117b, which has the function of a stop, which is supported by the motor drive movement in a suitable direction of rotation rotating planetary carrier 1 17 rests with its cam 1 17b against a driver 80b of the rocker and thereby rotates this in a movement according to arrow 1 13 (FIG. 6) about the rocker axis 80a against the tensioning wheel in fact a noticeable rotation executed around the rocker axis 80a, but substantially only increases the torque around the rocker axis 80a. In both cases, however, the pressing force with which the rocker 80, the clamping plate 89 and the band presses against the tensioning wheel 87, increased. This increase usually does not occur in a single step. The ultimately attributable to the motor drive movement and the already existing belt tension and taking effect in the tensioning gear 106 increasing the pressing force of the rocker against the belt is proportional to each existing in the belt and as resistance to maintenance and against a further increase in the belt tension at the Engagement point in the band, the band acting on the clamping plate 89 and the tensioning wheel 87 resistance or restoring force instead. As long as the clamping process causes an increase in the belt tension, as long as the resistance force and thus the resulting pressure force increases. FIGS. 8 and 9 show the end positions of rocker 80 which are possible on the one hand by the pivoting of the rocker for opening and closing on the one hand and to increase the pressure force on the band on the other hand. As shown in FIG. 8, in one of the two end positions, the chucking plate 89 becomes clockwise due to contact of the cam 1 17b of the planetary carrier 17 with a contour of the follower 80b and a direction of rotation of the planetary carrier (referring to the illustration of FIG. 8) Turn the rocker anticlockwise about its rocker pivot axis. The driver 80b and the cam 1 17b act like a lever which causes a counterclockwise torque about the rocker pivot axis 80a.

Fig. 9 shows the end position of the open rocker. Here, the planet carrier rotates 1 7 in comparison to FIG. 8 in the reverse direction of rotation and thereby comes into abutment against the driver 80c of the rocker 80. The driver 80c is located with respect to the rocker pivot axis 80a and the other driver 80b on the other side of the rocker pivot axis 80a. In the position of use of the strapping apparatus with a horizontal orientation of the base plate, the driver 80b is located above and the driver 80c below the rocker pivot axis 80a. The rocker pivots thereby in the illustration of FIG. 9 in the clockwise direction, thereby creating a distance to the tensioning wheel 87th

Fig. 12 shows a partial perspective view of the clamping device of the second embodiment, in which only one of the two terminals is shown. Here, the clamp 33 is brought into abutment against the plane and in cross-section substantially exactly circular peripheral surface 107b of the ring gear 107. In Fig. 13 is a sectional view through the ring gear 107 and the clamp 33 is shown. By means of the terminal 33 of the locking device, the ring gear can be selectively clamped against rotational movements or released again. Each of the clamps provided in the strapping devices according to FIGS. 2-11 may preferably be designed according to the locking device described here, but conventional locking devices are also possible. In the preferred clamping according to the invention, an at least approximately circular or circular arc-shaped circumferential surface of the wheel cooperate with a pivotable clamping element or clamping body. As Clamping surface acting peripheral surface 107b of the illustrated preferred embodiment has no locking elements with which a on a positive engagement of a clamping element in a locking element or a recess based clamping is provided.

The clamping element 33 is pivotally mounted about the switching and pivot axis 143, wherein the switching axis 143 of the clamping element 33 is parallel to the axis of rotation of the wheel 107 to be clamped. The switching axis 143 extends in the region of one end of the cam-shaped clamping element 33. In the region of the other end of the clamping element, an arcuate contact surface 33a is provided, which is provided for contact with the clamping surface 107b of the wheel to be clamped. Due to the circular shape of the clamping surface 109b and in the side view arched shape of the contact surface 33a comes on contact of the clamping element 33 with the peripheral surface 107b a substantially linear contact, this contact line is perpendicular to the plane of Fig. 13.

As is apparent from Fig. 13, the clamping member 33 is arranged with respect to the wheel 107 to be clamped such that the contact line of the contact surface 33 a has a distance 155 to its pivot axis 143, which is greater than the distance of the pivot axis 143 to the clamping surface 107 b. As a result, in the case of a pivoting movement of the clamping element 33 from its release position into a clamping position, it already comes into contact with the clamping surface 107b in front of a connecting straight 156 of the axis of rotation of the wheel 107 with the pivot axis 143 of the clamping element. With respect to the intended direction of rotation 157 of the wheel 107 to be clamped, the contact line is in front of the (imaginary) connecting line 156. The rotation of the wheel 107 is braked and can at most continue to move slightly further. Due to a further rotation against the thereby increasing clamping action, the clamping effect further amplifies and amplifies an increasing wedging of the clamping element 33 against the wheel 107. Due to these geometric conditions, the clamp 33 can not pass in the direction of rotation of the wheel connecting line 156, their pivotal movement stops before Connecting line 56 and presses against the clamping surface 107b. In an end position, which is already substantially the position of the first contact with the Clamping element 33 corresponds, the wheel 107 is clamped against the cam-shaped clamping element 33. A further movement is no longer possible even with an arbitrarily high torque. In Fig. 14, the geometric relationships are shown in the clamping. Again, the connecting line between the rotation axis 86a of the wheel 107 and the pivot axis 143 is denoted by 156. The contact surface (circumference) of the wheel could be smooth or slightly textured. The radius of the wheel at the point of contact with the cam is designated 158 and the pivot radius of the clamping element 33 at the point of contact 155. The pivoting radius 155 at the contact point encloses an angle α with the connecting line 156, the radius 158 of the wheel 107 with the pivoting radius 155 (in each case at the contact point) an angle γ. In the exemplary embodiment, the geometric relationships are such that in the clamping position in which the wheel 107 is blocked against rotational movements in the intended direction of rotation, the angle γ is at least approximately 155 °. Good results could also be achieved in experiments if an angle from a range of 130 ° to 170 °, in particular from 148 ° to 163 °, is established. The angle α should advantageously be greater than or equal to 7 °. In the exemplary embodiment, it is 9 °. In other embodiments, it may also be selected from a range of 7 ° to 40 °.

In the preferred embodiments of the invention discussed herein, unless the wedging action is sufficiently strong, it is not absolutely necessary that the position of the cam be maintained in its clamping position by an external action. This results already alone from the fact that the wheel 107 is rotatable only in one direction of rotation and exactly this is releasably blocked by the clamp 33. In preferred embodiments of the invention, the cam-shaped clamping element is held in position by the spring force of a spring element 159. For this purpose, the spring element 159 bears against the clamping element above the switching axis 143 and rotates or holds the clamping element 29 in its clamping position. In order to remove the clamping element from its clamping position, the spring force has to be overcome with a switch 160. With the switch 160 both terminals 29 and 33 can be operated simultaneously. Depending on the arrangement of the switch / button, the spring force can be applied by pulling or pressing the switch overcome and the ring gear 107 released from the terminal 33 and the planet carrier 105 are locked. In the respective other movement of the switch / button, the terminal 29 and the planet carrier 105 is released again via the spring force, while the clamp 33 blocks the ring gear 107.

The different operating concepts for a strapping apparatus, in particular those shown in FIGS. 1, 1 a, 1 b and previously described operating concepts, can also be provided for this embodiment of a strapping apparatus according to the invention.

LIST OF REFERENCE NUMBERS

T o m o n s w o rk s w o rk h tu s 30 Sun wheel

Housing 31 rotation axis gear and

Handle tensioning wheel

Base plate 32 ring gear

Clamping device 32a outer surface

a clamping axis 33 second clamp

Tensioning wheel 34 planetary gear

Rocker 35 planet carrier

a rocker pivot axle 36 sun gear

Clamping plate 37 planet carrier

0 button 37a paragraph

2 friction-welding device 38 planetary gear

3 welding shoe 39 stop element

4 transfer device 40 arrow

5 accumulator 41 planetary gear

9 bevel gear 42 planet carrier

0 bevel gear 43 sun gear

1 gear 44 spring element (return spring) 2 toothed belt drive 45 freewheel

3 gear 46 support

4 shaft 46a recess

5 planet carrier 80 swiveling rocker

5a Clamping surface 80a Rocker pivot axis

5b planet wheels 80b driver

6 gear 80c driver

7 ring gear 86 clamping device

7a, paragraph 86a clamping axle

7c cam 87 tensioning wheel

8 Rolling bearing 89 Clamping plate

9 first terminal 99 bevel gear

9a arcuate contact surface 100 bevel gear Spur gear (planet carrier) 125 Freewheel

b planet gear 143 shift axis

Gear 144 button

Ring gear 150 Circular segment segment Peripheral surface 150c Gear teeth

Ring gear 151 Connecting shaft B Peripheral surface 151 a Connecting shaft c External toothing 155 Distance / swiveling radius Sun gear 156 Connecting line arrow 157 Direction of rotation

Arrow 158 radius

Planet wheels 159 spring element

Planet carrier 160 switches

planet carrier

b toothing B band

a cam M engine

b cams

c toothing

planet

planet carrier

sun

spring element

Claims

claims

Strapping device for strapping packaged goods with a strapping band, the

a tensioning device for applying a belt tension to a loop of a strapping band, wherein the tensioning device is provided with a rotatable about a clamping axis drivable tensioning wheel, which is provided for engagement in the strapping, the tensioning device further comprises a

Has clamping plate, wherein it is provided during a running of the clamping device clamping operation that a single or multilayer portion of the strap between the tensioning wheel and the

Clamping plate is located and both with the tensioning wheel and with the

Clamping plate is in contact,

Further, the tensioning wheel and / or the clamping plate is arranged on a pivotable about a rocker axis about a rocker axis to a motor

Swinging movement of the rocker to either increase or decrease a distance between the tensioning wheel and the clamping plate, as well

a connection device for generating a permanent connection, in particular a welded connection, on two superposed regions of the loop of the strapping band by means of a

Connecting element, such as a welding element, which is used for local

Heating the strapping band is provided has

marked by

an operable actuating device of the strapping device, which is provided with a button / switch, with which a switching state of a transmission of the strapping device is variable such that a drive movement of the drive means either for rotation of the tensioning wheel or

Pivoting movement of the rocker leads.

2. strapping device according to claim 1, characterized in that with the same transmission, in particular a planetary gear, a Drive movement of only one motor either on the tensioning wheel or on the rocker (8) can be conducted.

3. Umreifungsvorrichtung according to claim 1, characterized in that in one of the switching states of the transmission driven by the drive means pivoting movement of the transmission leads to increase the distance between the tensioning wheel and the clamping plate,

4. strapping device according to claim 1 or 2, characterized in that with the button / switch two provided for acting on the transmission switching elements, such as terminals, are actuated, in particular at least substantially simultaneously actuated.

5. strapping device according to claim 4, characterized in that with the button / switch switching elements are actuated, which are provided for acting on different transmission elements of the transmission.

6. Umreifungsvorrichtung according to at least one of the preceding claims, characterized in that with only one key / switch the

Actuating device - and in particular with only one actuation of the button / switch - the at least two switching elements can be actuated.

7. strapping device according to at least one of the preceding claims, characterized in that after a successful clamping operation of the strapping band actuation of the button / switch leads to reduce the belt tension of the stationary with the tensioning wheel band section.

8. strapping device according to at least one of the preceding claims, characterized in that an actuation of the button / switch to

Generation of the switching state of the transmission is also provided for triggering other functions of the strapping device, in particular for triggering the tensioning operation and / or for triggering the generation of the compound on the strapping.

9. strapping device according to at least one of the preceding claims, characterized in that an actuation of the button / switch is also provided for the transfer of the connecting device in its rest position and / or in its working position.

10. strapping device according to at least one of the preceding claims, characterized in that in addition to the key / switch whose operation leads to change the switching state of the transmission, at least one further key / switch, in particular for triggering the clamping operation and / or to trigger the generation of the compound is provided on the strapping.

11. Umreifungsvorrichtung according to at least one of the preceding claims, characterized in that in addition to the key / switch whose operation leads to change the switching state of the transmission, and to another button / switch, which is provided to trigger the clamping process, at least one more Button / switch is provided for triggering the generation of the connection on the strap.

12. Umreifungsvorrichtung according to the preamble of claim 1, characterized

in that only one drive device, in particular only one motor, can be triggered by an actuating device of the strapping device with which the tensioning wheel can be driven, with which the tensioning wheel can be driven

Connecting device can be moved into its working position, in which with the connecting device on the strapping the permanent connection can be generated, the energy is provided for the connection means for generating the permanent connection, and with the rocker for generating the distance between the tensioning wheel and the clamping plate is drivable.

13. strapping device according to claim 12, characterized by a

Configuration of the strapping device according to at least one of claims 2 to 11.

14. Strapping device according to claim 12, characterized by only one key of the key device, with which only one drive device can be triggered.

15. Umreifungsvorrichtung according to claim 12, characterized in that the only one key is occupied by different key presses with multiple functions.

16. strapping device according to claim 12, characterized in that the key in a single operation and repeated actuation successively different functions, in particular different drive movements, the strapping device triggers.

17. strapping device according to claim 12, characterized by a

Clamping button, with the drive movements for the tensioning wheel and for the connecting device and the transfer device of the

Connection device either separately or jointly triggered, and by a rocker button with which the drive movement for the rocker for generating the distance between the tensioning wheel and the clamping plate is driven.

18. Strapping device according to at least one of the preceding claims, characterized in that by actuation of a button / switch, a voltage release of the tensioning wheel engaged with the belt section takes place.

19. strapping device according to at least one of the preceding claims, characterized in that the locking device is provided for releasing the previously made clamping, while the band tension acts on the clamped wheel wholly or partly.