EP2897867A1

EP2897867A1 - Strapping device

Info

Publication number: EP2897867A1
Application number: EP13821914.2A
Authority: EP
Inventors: Favio FINZO; Mirco Neeser; Dimitrios Takidis
Original assignee: Signode International IP Holdings LLC
Current assignee: Signode International IP Holdings LLC
Priority date: 2012-09-24
Filing date: 2013-09-24
Publication date: 2015-07-29
Anticipated expiration: 2033-09-24
Also published as: US20230145839A1; US10370132B2; CN104870315A; CN105324310A; US11932430B2; EP2897867B1; US9938029B2; EP2897866B1; EP2897866A1; CN105324310B; WO2014167377A1; US11667417B2; ES2752195T3; JP2015529178A; JP6329151B2; US20150246739A1; US20150210411A1; US11267596B2; US11560245B2; ES2895662T3

Abstract

The invention relates to a strapping device, in particular a mobile strapping device, for strapping packaged products using a strap, said device having a tensioning device for applying tension to a loop of a strapping band and being provided with a tensioning gear that can be motor-driven to rotate about a tensioning axis. The tensioning device also has a tensioning plate that co-operates with the tensioning gear and the tensioning gear and/or the tensioning plate is or are located on a rocker that can be motor-driven to pivot about a rocker axis, in order to increase or decrease the distance between the tensioning gear and the tensioning plate by means of a pivoting motion of the rocker. An aim of the invention is to achieve a high functional reliability in a strapping device of this type. According to the invention, this is achieved by a single motor, the drive motion of which can set both the tensioning gear in rotation, in order to tension the strap, and can pivot the rocker about the rocker axis in a motor-driven manner in identical directions in such a way that the distance between the tensioning gear and the tensioning plate can be changed, in particular increased by means of the pivoting motion.

Description

strapper

The invention relates to a strapping device, preferably a mobile strapping device, for strapping packaged goods with a strapping band, which has a tensioning device for applying a belt tension to a loop of a strapping band, wherein the tensioning device is provided with a tensioning wheel that can be driven by a motor axis in a rotational manner Is provided in the strapping band, the clamping device further comprises a clamping plate, wherein during a clamping operation performed by the clamping device is provided that a portion of the strap between the tensioning wheel and the clamping plate and is both with the tensioning wheel and the clamping plate in contact , Further, the tensioning wheel or the clamping plate is arranged on a rocker arm rotatable about a rocker axis to a motor to pivot by a pivoting movement of the rocker, a distance between the tensioning wheel and the clamping plate either increase or decrease , The strapping device furthermore has a connecting device, such as a welding device, for producing a connection, in particular a friction-welded connection or other welded connection, with which local heating of the strapping band can be performed on two superimposed regions of the loop of the strapping band by means of a welding element.

Such mobile 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 here 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 (or other connection technique) on 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 movement The resulting heat melts the usually plastic-containing band 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. At substantially the same time or after, 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 strapping device of the type mentioned, despite the possibility of at least largely automated and fast production of tape strapping high reliability and good Has handling properties. In particular, the task is not directed exclusively to mobile strapping devices.

This object is achieved according to the invention in a strapping device of the type mentioned by only one motor, with the drive movements in identical directions of rotation, the tensioning wheel for tensioning the strapping band is both in rotation displaceable and the rocker about the rocker axis such motor or pneumatically driven to pivot to change the distance between the tensioning wheel and the clamping plate with this pivoting movement, in particular to increase.

With the solution according to the invention only one motor is required so that both the clamping operation of the belt by the tensioning wheel and the lifting of the rocker of the tensioning device can be effected by a respective motor movement. According to the invention, the same only one direction of rotation of the motor, which is preferably designed as an electric motor, can be used here. The invention thus enables an extension of the executable with only one engine functions whose benefits come in a mobile portable strapping to bear in particular mass. Since in embodiments of the invention, the pivoting or lifting of the rocker is no longer manual but motor, can be omitted in appropriate embodiments of the invention, the previously always necessary for movement of the rocker of the tensioning wheel hand-operated lever and the transmission mechanism from the lever to the tensioning wheel. The invention thus not only enables a higher level of automation in strapping devices, it also enables a reduction in the weight of such mobile strapping devices despite the higher level of automation.

Furthermore, not only a reduction of the number of motors in strapping devices is possible with the invention. In preferred embodiments of the invention, an at least substantially completely automated strapping process is also made possible, in which the welding device and its delivery or transfer to the band as well as the severing of the band to separate a closed belt loop from the supply of the tape, with the Driving movements of only a single motor of the strapping device is made. Strapping devices in which with only one motor, both the clamping operation, as well as the transfer of the welding device in the welding position, also a drive of the welding shoe and a drive of the cutting blade is made known from WO 2009/129633 A1. WO 2009/129633 A1 is hereby incorporated by reference to the said solution and its contents are incorporated by reference.

An expedient embodiment of the invention can provide that in a transmission, in particular in a transmission of the tensioning device, alternately either an operative connection of the motor to the tensioning wheel or an operative connection of the motor to the rocker can be generated. In these solutions, the operative connection of the electric motor should be made by either at least one switching operation either with the rocker or with the tensioning wheel and thus only one of both functions are performed. Since switching operations are particularly simple, i. can be implemented with little design effort, such a solution can be purely mechanical and still designed to be weight-saving and reliable.

The at least one switching operation can take place in a preferred embodiment by two clamping devices of a locking device, which can be brought alternately into blocking engagement with at least one gear member of a transmission of the clamping device to the motor drive movement with identical direction of rotation provided by the engine by the blockage of the respective gear member Drive movement to transfer the latter on the tensioning wheel or in the form of a lifting or lowering movement on the rocker. As a transmission of the clamping device may be provided in particular a single or multi-stage planetary gear. The clamping devices thus act in such embodiments of the invention thus advantageously on two gear members of the planetary gear.

A structurally particularly inexpensive solution for generating the pivoting movement can provide that a gear member of the planetary gearbox, which is locked against rotational movements and preferably also transmits the drive movement of the motor to the tensioning wheel, is provided for supporting a gear element rotatable about the rocker axis. In such a solution, the planetary gear can thus both for the drive movement the tensioning wheel as well as for the drive movement of the rocker be used. Such solutions, despite the very different translations, which are required for both functions, with a very small number of components.

In a particularly preferred further embodiment of the invention, which also has independent significance, the motor drive movement of only one motor, except for the drive of the tensioning wheel when tensioning the strapping and for lifting the rocker for a band voltage-dependent variable pressing or pressing the tensioning wheel and / or the rocker be provided on the exciting band. The tape tension dependent pressing and thus the band voltage dependent increase in the pressing force of the clamping device against the tape, may also have independent significance. 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 tensioning of the belt can preferably be used in such a way that an opposing force acting on the tensioning wheel by the strapping belt is used during the tensioning process of the strapping belt by means of the tensioning belt engaging in the strapping belt and rotating against a belt tension in order to increase the contact pressure of the tensioning wheel in the direction To increase the clamping plate or the contact pressure of the clamping plate in the direction of the tensioning wheel.

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 can also be provided with advantage that with a loosening 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;

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;

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

Rocker is in a second Schwenkendposition;

10 is a side view of the clamping device of FIG. 2, in which the

Rocker is in a position with high pressure against a clamping plate;

11 is a side view of the clamping device of FIG. 2, in which the

Rocker is in a position with respect to Figure 10 lesser pressure against a clamping plate;

Fig. 12 is a partial perspective view of the clamping and the

Locking device;

Fig. 13 is a sectional view of the clamping and locking device;

Fig. 14 is 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 surrounds the mechanism of the strapping device 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 from an end position spaced from a final position with a spacing, preferably curved, to a second end position by pivoting the rocker 8 about the rocker pivot axis 8a 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, in a manner known per se, a welding of the two layers by means of the friction-welding device 12 of the strapping device can take place at one point of the band loop on which two layers of the band lie one above the other. 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 in detail not shown in detail Provided freewheel, is caused by the fact that the drive movement is transmitted in the respectively provided driving direction of rotation to the corresponding functional unit of the strapping and in the respectively provided for this other drive direction of rotation of the motor no transmission.

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 here by mechanical pressure on the strapping ungsband depressed 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, an exchangeable accumulator 15, which can be removed in particular for charging, is arranged on the strapping apparatus and serves to store 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 apparatus according to the invention is provided, 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 tap. 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 pressed onto two superimposed layers of the strapping band can hereby be set into an oscillating movement of predetermined frequency and amplitude with which the two 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 8. 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 carry out slight relative movements within its engagement in the support 46, for example in a recess 46a of the support can. 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 exemplary embodiment, a first terminal 29 of a locking 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 44. 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 may be formed in principle the same way as the first terminal 29 as a switchable cam which can be moved between two end position, in one position the ring gear 32 blocks against rotation and in the other position for rotational movements is released. 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 gear takes the planet 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 planetary gears 38 of the further planet carrier 37 facing the tensioning wheel 7. The planetary 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 rotate about the tensioning axis 6a. This rotational movement of the tensioning wheel 7 (not shown) provided on its outer peripheral surface with a fine toothing is used to gripping the tape B with the enveloping tape and retracting the tape from the tape loop, thereby increasing a tape tension in the tape loop.

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 Federlement can be released and the entire strapping process with its successively executed operation sections "clamping", "shutter production", "cutting", releasing the tension from the band in the area of the clamping device, and "raising the rocker" are triggered, including preferably no further intervention by the operator of the strapping device must be made. 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. 1) 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 condition "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 the opposite direction This opposing force acts in the reverse direction of transmission as the motor drive movement, on all involved in the transmission of the drive movement gear members of the multi-stage planetary gearbox If a different type of transmission than a single or multi-stage planetary gear is used, so is also on this from the For the purposes of the present invention, the opposing force resulting from this and applied via the contact with the tensioning wheel into the respective transmission is available for use in accordance with the present invention the functional reliability even at high applied tape tensions, are used. To use this counterforce for the purpose described below, it would thus be in principle possible 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 The planetary carrier is for this purpose formed with the engagement element 37a which cooperates with the stationary stop element 39. The cam element, which is arranged on the outer circumference of the planet carrier and protrudes substantially radially from this, is supported on the stop element 39 3, the fixed stop element 39 is located in the region of the head end of the strapping apparatus in this case tally parallel to her rocker pivot axis 8a 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 the tape tension already introduced into the tape is, the higher is the resulting and from the still acting on the tensioning wheel 7 motor drive movement resulting 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 is pressed and as long as the key 10 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 10, 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 achieved by switching the terminals 29, 33. 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.

The tensioning wheel 7 can thereby rotate freely driven and has no operative connection to the electric motor M and the sun gear 30 more, the one Could transmit 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 10 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.

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. Also, the basic structure of this Embodiment of the strapping apparatus may correspond to that of the previously discussed preferred embodiment of the invention. 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 a freewheel 125 arranged on the shaft of an input-side sun gear 110 it is ensured 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 to the input side sun gear 110 motor drive movement can not be due to the rotation of the planet carrier 105 due to the means of the terminal 29 made releasable rotational locking of the planet carrier 105 to rotational movements of the planet gears 105b of the planet carrier 105th with these planetary gears 105b into engagement standing internal toothing 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 is parallel to the stationary tension 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 109 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 outer toothing 117c of the planet carrier 117 and thereby transmits the rotational movement about the connecting axis 151a on the planet carrier 117. With respect to the clamping axis 86a is the connection axis 15 a on the one and the Rocker pivot axis 80a on the other side of the clamping axis 86a, wherein the rocker pivot axis 80a is located on the side of the head end of the strapping device. The planet carrier 117 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 rotational movement transmitted to the planetary carrier 117, the planetary carrier 117 rotates about the clamping axis 86a and takes with a arranged on its outer peripheral surface cam 117a 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. In order 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 112 (FIG. 6) is used, by which the rocker 80 is opened as described and a distance between the tensioning wheel 87 and the Clamping plate 89 is enlarged. 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 114 of the second planetary carrier 1 5 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 planetary 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 planet carrier 117 rests with its cam 117b against a driver 80b of the rocker and thereby rotates them in a movement according to arrow 113 (FIG. 6) about the rocker axis 80a against the tensioning wheel rotary motion executed about 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 on the motor drive movement and the already existing Tape tension returning and taking place by engaging in the tensioning gear 106 increasing the pressing force of the rocker against the tape is proportional to each present in the band and as a resistance to maintenance and against further increase in the belt tension at the point of engagement in the band, from the band to the clamping plate 89 and acting on the tensioning wheel 87 resistance or restoring force. 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 chuck plate 89 becomes clockwise due to contact of the cam 117b of the planet carrier 17 with a contour of the dog 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 7b 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. In this case, the planet carrier 117 rotates in the opposite direction of rotation compared with FIG. 8 and thus comes into abutment against the driver 80c of the rocker 80. The driver 80c is located on the other side of the rocker pivot axis 80a with respect to the rocker pivot axis 80a and the other driver 80b , 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 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. The peripheral surface 107b of the illustrated preferred embodiment, which acts as a clamping surface, has no latching elements with which a clamping based on a positive engagement of a clamping element in a latching element or a latching recess 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 jammed wheel 107 is the contact line in front of the (imaginary) connecting line 156. The rotation of the wheel 107 is braked and can move at most 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 156 and presses against the clamping surface 107b. In an end position which substantially already corresponds to the position of the first contact with the clamping element 33, 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 giatt or slightly structured. 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 from the fact alone that the wheel 107 is rotatable only in one direction 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 can be overcome by pulling or pressing the switch, the spring force 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.

LIST OF REFERENCE NUMBERS

Strapping device 30 sun gear

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 panning wheel

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 W

105 Spur gear (planet carrier) 124 Spring element

105b Planet wheel 125 freewheel

106 Gear 143 Switching axis

107 ring gear 150 arc segment

107b peripheral surface 150c toothing

109 ring gear 151 connecting shaft

109b peripheral surface 151a connection axis

109c External teeth 155 Distance / swivel radius

110 sun gear 156 connecting line

112 arrow 157 Direction of rotation

113 arrow 58 radius

114 planet gears 159 spring element

115 planet carrier 160 switches

117 planet carrier

117b toothing. Band

117a cam M engine

117b cams

117c toothing

118 planetary gear

121 planetary gear

122 planet carrier

123 sun wheel

Claims

claims

Strapping device, in particular mobile strapping device, for strapping packaged goods with a strapping band, the

a tensioning device for applying a belt tension on a loop of a strapping band, wherein the tensioning device is provided with a rotatably driven by a clamping axis tension wheel, which is provided for engagement in the strapping, the tensioning device further comprises a clamping plate, wherein during one of the tensioning device executed clamping operation is provided that a single or multilayer portion of the strap between the tensioning wheel and the

Clamping plate and is in contact with both the tensioning wheel and the clamping plate,

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 producing 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, for example, a welding element, which is provided for local heating of the strapping, has

in

by only one motor, with its drive movements in identical

Turning the tensioning wheel for tensioning the strapping both in rotation is displaceable and the rocker about the rocker axis driven by such a motor is pivotable to change the distance between the tensioning wheel and the clamping plate with this pivotal movement, in particular to increase.

2. Umreifungsvorrichtung according to claim 1, characterized in that the strapping device, in particular the tensioning device of

Strapping device, hand lever free.

3. strapping device according to at least one of the preceding claims, characterized in that in a transmission, in particular in a transmission of the tensioning device, alternately either an operative connection of the motor to the tensioning wheel or an operative connection of the motor to the rocker can be generated.

4. strapping device according to claim 3, characterized by two

Clamping means, which are alternately in blocking engagement with at least one gear member of a transmission of the clamping device can be brought to the block by the respective gear member, the motor drive movement without changing the input-side rotational direction of the motor provided by the drive movement latter to the tensioning wheel or in the form of a lifting movement on the To transfer rocker.

5. Umreifungsvorrichtung according to at least one of the preceding claims, characterized in that at least temporarily during the transmission of the motor drive movement to the tensioning wheel, the motor

Drive movement is also used to increase by means of a motor driven by the pivotal movement of the rocker in the direction of the clamping plate a contact pressure of the tensioning wheel in the direction of the clamping plate.

6. Umreifungsvorrichtung according to at least one of the preceding claims, characterized in that the motor drive movement is used such that during the tensioning operation of the Umreifungsbands by means of engaging in the strapping and rotating belt tension against a tensioning wheel from the strapping on the tensioning wheel acting counterforce is used, to the contact pressure of the tensioning wheel in the direction of the

Increase clamping plate.

7. strapping device according to at least one of the preceding claims, characterized by an increase of the contact pressure, which is at least substantially proportional to the respective instantaneous belt tension.

8. Umreifungsvorrichtung according to at least one of the preceding claims, characterized in that with the only one motor of

Strapping device and the connecting device, in particular the welding device, can be driven.

9. Umreifungsvorrichtung according to at least one of the preceding claims, characterized in that with the only one motor and a

Transfer movement can be generated with which the welding element can be transferred from a position at a distance from the strapping in a welding position in which the welding element can be brought into contact with the strapping.

10. strapping device according to at least one of the preceding claims, characterized in that with the only one motor and a

Cutting device is driven, with a transection of the

Strapping is executable.