Technical Area The invention concerns a device for handling valuable documents such as banknotes and a valuable document machine that comprises the device for handling valuable documents. Such devices and machines are used for example at cash-points, in shops, in banks and at post offices, where money is received and paid out.

Background Different types of device for valuable documents, such as banknote machines, are available on the market. These normally comprise a cover with an opening for the input or output of banknotes, a transport arrangement for the transport of banknotes between the opening and a storage space, and a control arrangement that controls the transport arrangement. Such banknote machines can, for example, carry out the storage of banknotes, and the input, output or a combination of input and output of banknotes. One type of arrangement receives, dispenses and stores banknotes between films. This type of arrangement places requirements for security and speed, and this type requires that the banknotes are transported and stored in the arrangement in a reliable manner. US 4,249,552 shows an arrangement for the automatic handling of banknotes, where (as is shown in Figure 4) transparent transport bands (134, 138) receive banknotes and where the banknotes and the transport bands are rolled up around a storage roller (128). One end of each transport band is attached to one particular roller (124, 126), which rollers are driven by motors (158, 162), and the second ends of the transport bands are attached to the storage roller (128), which is driven by a motor (166). The storage roller is driven during input of banknotes, and the motors (158, 162) of the other rollers are used in order to maintain the transport bands under tension. The motors are thus used both for the transport of banknotes and for tensioning the transport bands. The arrangement is controlled with the aid of a computer that gives commands to a control unit (see Column 9). The arrangement that has been described demonstrates driving and tensioning of the film that comprises monitoring by a control unit, sensors and motors, and this may require a complicated design, it may increase the cost and it may involve a complicated working method or one that involves wear. Summary of the Present Invention The present invention concerns arrangements for valuable documents where valuable documents are transported by at least one transport band, which passes from a roller around which the transport band is wound, and are stored at a storage roller around which the transport band is wound together with the valuable documents. The present invention demonstrates improved methods and arrangements for the handling of valuable documents when using transport bands. One aim of the present invention to achieve an improved arrangement for placing the transport band or transport bands under tension, which tensioning arrangement is arranged at at least one roller around which the transport band, when in use, is wound. Thus, the present invention specifies: an arrangement for the handling of valuable documents, where valuable documents are transported by at least one transport film, comprising a driving arrangement, a first transport film, which is driven by the driving arrangement, and which first transport film is wound around and passes from a first roller, such that the transport film can be unwound from the first roller, the transport film passes onwards to a storage roller, around which storage roller the transport film is wound together with the valuable documents when valuable documents are stored at the storage roller and whereby the transport film is unwound from the storage roller when valuable documents are transported from the storage roller, and at least one tensioning arrangement, which is connected to the storage roller or the film roller and is arranged to place the transport film under tension, and it is characterised in that the tensioning arrangement places the film under tension by interacting with the roller in question in its direction of winding up while it is at the same time unwound. In one preferred embodiment the tensioning arrangement comprises a slip clutch, which interacts with the roller in question in its direction of winding up. The tensioning arrangement is connected to and is driven by the driving arrangement in one preferred embodiment. The tensioning arrangement in one preferred embodiment is connected to the driving arrangement through a direction conversion arrangement that is arranged to direct both a clockwise rotation and an anti-clockwise rotation from the driving arrangement into a rotation in the direction of winding up of the roller in question. The arrangement for handling valuable documents comprises in another preferred embodiment two tensioning arrangements, which are connected to the storage roller and to the first roller. In a further preferred embodiment the transport film passes from the first roller, via and in contact with a first intermediate roller, to the storage roller. It is preferable that the arrangement further comprises a second transport film, wound around a second roller, and which passes via a second intermediate roller arranged next to the first intermediate roller and onwards to the storage roller, such that valuable documents can be received between the first and the second transport film, and stored between these when they are wound around the storage roller. It is preferable that a tensioning arrangement comprising a slip clutch is connected to the second roller and interacts with the second roller in a direction of winding up of the transport film around the roller.

It is preferable that the intermediate roller is connected to the driving means and drives the first transport film. The present invention also specifies a method for the tensioning of a transport film in an arrangement for the handling of valuable documents, where the arrangement comprises a driving arrangement, a first transport film, a first roller, a storage roller, which first transport film is wound around and passes from the first roller, such that the transport film can be unwound from the first roller, the transport film passes onward to the storage roller, and comprising a tensioning arrangement connected to the storage roller or the film roller and arranged to place the transport film under tension, where the method comprises driving the first transport film with the driving arrangement, which driving can be carried out in two directions, and it is characterised by tensioning of the transport film by interacting with the roller in question in its direction of winding up while it is unwound. The present invention also specifies a valuable document machine comprising the said arrangement for handling of valuable documents. Brief Description of Drawings Reference will be made in the remainder of this description to the attached drawings in order to obtain a better understanding of the invention and of its embodiments and examples, whereby: Figure 1 illustrates in a view from the side a banknote handling arrangement according to the present invention. Figure 2 illustrates in a perspective view a banknote handling arrangement according to the present invention. Figure 3 illustrates an arrangement for converting the direction of rotation, which can be used in connection with the banknote handling arrangement illustrated in Figure 1. Figure 4 illustrates a banknote machine comprising banknote handling arrangements according to the present invention. Figure 5 illustrates a second banknote machine comprising banknote handling arrangements according to the present invention. Figure 6 illustrates a variant of the banknote handling arrangement according to the present invention, with only a single transport band around the storage roller. Figure 7 illustrates an arrangement for banknotes according to the prior art.

Detailed Description It is possible to envisage different methods for driving transport bands for banknotes, and, for example, placing them under tension,. Figure 7 shows in a view from the side parts of an arrangement for the storage of banknotes. This drawing is intended as an illustration of the prior art in a manner that is useful for an understanding the present invention. A banknote 101 is received between two plastic films 102, 103 and it is transported to a roller for the storage of banknotes, the storage roller 104, where the banknotes are stored between the plastic films. Figure 7 shows two rollers 105, 106 with a plastic film which film rollers 105, 106 are driven by motors 115, 116. The storage roller 104 is driven by a motor 114. The films pass from the film rollers to the mutual storage roller via two intermediate rollers 108, 109 arranged in an area for input and output. A control unit 110, comprising a computer unit with processor and memory, controls the motors. Sensors 111 , 112, 113 are located in association with the films, which sensors monitor the extension of the films and transfer signals to the control unit such that the control unit gives signals to the motors such that the film is maintained under tension. Figure 1 presents a schematic illustration in a view from the side of an arrangement for banknote handling according to the present invention. It is appropriate that such an arrangement is arranged within a banknote machine. The arrangement can be used for the storage of other types of valuable document in addition to banknotes, such as value coupons, credit receipts, cheques and gift vouchers. This drawing, as are other drawings, is simplified in order to illustrate component parts and their functions, and for this reason the size relationships between the component parts have been adapted in order to make the drawings clear, rather than to show the actual sizes. The arrangement comprises a first 18 and a second 19 transport band. The transport bands in this example are constituted by thin films, for example, transparent Mylar films. The first film 18 is wound up (14) around a first film roller 10. It is appropriate that one end of the film 18 is attached to the film roller 10. The second end of the first film 18 is attached to and wound up around a storage roller 12. During input of a banknote 26, the banknote is received between the films 18, 19 and stored by its winding up 16 around the storage roller 12. The first film 18 passes from the first film roller 10 over and in contact with an intermediate roller 24 and passes onwards to the storage roller. The intermediate roller 24 is connected with a driving arrangement M, which appropriately comprises an electric motor. The driving arrangement M is arranged to drive the first intermediate roller in two directions, as is specified in the drawing by the bi-directional arrow drawn with a continuous line on the roller. The second film 19 is in a similar manner wound up (15) around the second film roller 11 , to which second film roller the first end of the second film is attached. The second film 19 passes from the second film roller 11 via a second intermediate roller 25, with which it makes contact, and onwards to the storage roller 12, to which the second end of the second film is attached. Thus, both films 18, 19 are wound up 16 around the storage roller 12. The films 18, 19 are in contact with the relevant intermediate roller over an extent that is less than one rotation around the roller and they are thus not wound up around the intermediate rollers. The second intermediate roller 25 is connected with the driving arrangement and can be driven in two directions by the driving arrangement, as is specified in the drawing by the bi-directional arrow drawn with a continuous line on the roller. The drawing shows how a first toothed wheel 27, connected to the first intermediate roller 24, connects the first intermediate roller with the second intermediate roller 25 with the aid of a second toothed wheel 28 connected with the second intermediate roller. The two toothed wheels 27, 28 are arranged coaxially with axis of rotation of the relevant intermediate roller 24, 25. During input of a banknote 26, the intermediate rollers 24, 25 are driven in the relevant input direction of rotation, and during output of a banknote the intermediate rollers are driven in an output direction of rotation. The intermediate rollers 24, 25 thus constitute driving rollers for the films. The intermediate driving rollers 24, 25 and the transport films 18, 19 are adapted such that they acquire a suitable friction between them: the driving rollers, for example, are provided with a frictional layer of, for example, a rubber material, on their outer surfaces. The driving rollers may also be bonded. During input, the intermediate rollers 24, 25 drive the films 18, 19, and a banknote 26, if present, in an input direction 30 in the direction towards the storage roller. During output, the intermediate rollers drive the films and banknotes, if present, in an output direction 32 in the direction away from the storage roller, such that each one of the films is driven towards the relevant film roller 10, 11 during output and is driven away from the relevant film roller 10, 11 during input. Since the films 18, 19 are driven towards the relevant film rollers 10, 11 during output, there is a risk that the films will become slack. In order to place the films under tension the arrangement comprises a first tensioning arrangement, which interacts with the first film roller 10 in the direction of winding up of this roller, as is specified by the dashed arrow 34. The arrangement also comprises a second tensioning arrangement, which interacts with the second film roller 11 in the direction (35) of its winding up. Both of these tensioning arrangements comprise slip clutches that are driven by the driving arrangement (M), which is symbolically illustrated in the drawing by the dashed lines 22, 23 between the driving arrangement and the relevant roller. When the films 18, 19 are driven towards the storage roller 12 during input, the films are placed under tension by a third tensioning arrangement, which interacts with the storage roller 12 in the direction 33 of winding up of the storage roller. This third tensioning arrangement comprises a slip clutch that is driven by the driving arrangement, as is indicated by the dashed line 21. The films are held under tension in that the roller or rollers, the storage roller 12 or the film rollers 10, 11 , that is or are being unwound interacts during the winding out with the relevant tensioning arrangement in its direction of winding up. The tensioning arrangements are connected with the driving arrangement in such a manner that when the intermediate rollers are driven in the correct direction of rotation that gives rise to input, the tensioning arrangements interact with the relevant rollers 10, 11 , 12 in a direction 33, 34, 35 that gives rise to winding up. The tensioning arrangements are connected to the driving arrangement in such a manner that when the intermediate rollers are driven in the correct direction of rotation that gives rise to output, the tensioning arrangements interact with the relevant rollers 10, 11 , 12 in a direction 33, 34, 35 that gives rise (again in this case) to winding up. A rotation conversion arrangement can be used in order to achieve a rotation in the slip clutches of the rollers 10, 11 , 12 in their directions 33, 34, 35 of winding up independently of whether the driving arrangement (M) drives the intermediate driving rollers 24, 25 in a direction of input or in a direction of output, which rotation conversion arrangement always drives an output shaft in the same direction independently of the direction of rotation of an input shaft. An example of such a rotation conversion arrangement is shown in Figure 3a and 3b. The films can interact with the tensioning arrangements, by the use of such an arrangement, in a direction away from the intermediate rollers independently of whether the intermediate rollers are driven in an input direction of rotation or an output direction of rotation. Figure 2 illustrates in perspective a banknote handling arrangement according to the present invention. The rollers 10, 11 , 12, 24, 25 are cylinders and rotate around their geometric axes. They are arranged on a framework 40 such that they can rotate. A first transport film (18 in Figure 1 , but omitted from Figure 2 in order to prevent other items being hidden) is wound up 14 around a first roller 10, which roller interacts in a direction corresponding to winding up (34 in Figure 1) with a first slip clutch 37. The slip clutch is illustrated in the drawing by a square plate, influencing the roller, that is held by the bolts on the shaft through a spring arranged on the shaft between the bolts and the plate. A second transport film (19 in Figure 1 ) is wound up around a second roller 11 , which interacts in a direction corresponding to winding up (35 in Figure 1) with a second slip clutch 38. The films (18, 19) pass over and are driven by intermediate driving rollers 24, 25. The second ends of the films are wound up together with banknotes around the storage roller 12, which interacts in a direction corresponding with winding up (33 in Figure 1) with a third slip clutch 36. A drive shaft 60 that can rotate in two directions is also illustrated in Figure 2. This shaft is connected with and drives, through a direction conversion arrangement, an output shaft 69, which always rotates in the same direction independently of the direction of rotation of the driving shaft 60. The output shaft 69 is further connected with the slip clutches that interact with the rollers 10, 11 , 12 in their directions (33, 34, 35) of winding up. The driving of the slip clutches is achieved by a transmission arrangement, which transfers driving motion from the driving arrangement on a shaft 60, which is driven alternatively in different directions during input and output, through a direction conversion arrangement that drives an ("output") shaft 69 in the same direction during both input and output to the slip clutches, such that these are driven in the same directions (33, 34, 35) during both input and output. When the driving arrangement is stopped, the driving motion to the transmission arrangement stops, and thus the rotating influence of the slip clutches on the rollers also stops. It is appropriate if the tensioning arrangements have a common direction conversion arrangement and individual slip clutches at each roller. Figure 3 illustrates an arrangement that converts an input rotation, which may be in either of two different directions, into an output rotation in a single direction. Such an arrangement can be used in a connection 21 , 22, 23 between the driving arrangement M and one or several of the slip clutches at the rollers 10, 11 , 12 in order to interact with the roller or rollers in their directions 33, 34, 35 of winding up (Figure 1). Figures 3a and 3b illustrate an arrangement 68 for converting direction with an input shaft 60, which can rotate in two directions, specified by an anti-clockwise arrow in Figure 3a and a clockwise arrow in Figure 3b. Figures 3a and 3b also show an output shaft 69 that rotates anti-clockwise in both of the drawings. The input shaft 60 and the output shaft 69 are connected to each other by two sets of toothed wheels: a first set consisting of three small toothed wheels 63, 64, 65; and a second set consisting of two large toothed wheels 62, 66. A first large toothed wheel 62 and a first small toothed wheel 63 are arranged on the input drive shaft 60, a second small toothed wheel 64 is arranged on an intermediate shaft 67, and a second large toothed wheel 66 and a third small toothed wheel 65 are arranged on the output shaft 69. The first small toothed wheel 63 is arranged on the input shaft 60 via a clutch arrangement 61 , which clutch arrangement locks in one direction of rotation and allows free rotation in the other direction of rotation. The first large toothed wheel 62 is in the same manner arranged on the input shaft 60 via a clutch arrangement (not shown in the drawing) that allows free rotation in one direction of rotation and locks in the other direction of rotation. Figure 3a illustrates a first case in which the input drive shaft 60 rotates in a first direction of rotation, such as the anti-clockwise arrow shown with a full line. The clutch arrangement 62 locks at the first small toothed wheel 63 for this first direction, illustrated by an anti-clockwise arrow shown with a full line on this toothed wheel, while at the same time the clutch arrangement arranged at the first large toothed wheel allows free rotation. The rotation in the first direction, anti-clockwise, is in this way transferred via a first set of toothed wheels, consisting of three small toothed wheels 63, 64, 65, to the output shaft 69, which rotates in the first direction (anti-clockwise). Figure 3b illustrates the second case in which the input drive shaft 60 rotates in a second direction of rotation, such as the clockwise arrow shown with a full line. The clutch arrangement 62 at the first small toothed wheel 63 allows free rotation for this second direction, while the clutch arrangement at the first large toothed wheel locks, which is illustrated by a clockwise arrow shown with a full line on the large toothed wheel 62. The input rotation in this second direction is in this way transferred via a second set of toothed wheels, consisting of the two large toothed wheels 62, 66, to the output shaft, which rotates also in this case anti-clockwise. The arrows drawn with full lines on the input shaft 60, the output shaft 69 and intermediate toothed wheels 62 - 66 illustrate how the rotation is transferred in the two cases. In the first case, Figure 3a, the input shaft 60 rotates in a first direction anti-clockwise, the first (small) toothed wheel 63 rotates in this direction with the shaft and drives the second (small) toothed wheel 64 clockwise, which in turn drives the third small toothed wheel 65 anti¬ clockwise, and this in turn drives the output shaft 69 anti-clockwise. The arrows drawn with dashed lines in Figure 3a illustrate how the large toothed wheels in the first case are driven by the output shaft without any transfer of power whereby the first large toothed wheel 62 rotates freely in the opposite direction relative to the input shaft. In the second case, Figure 3b, the input shaft 60 rotates in a second direction clockwise, whereby the first (large) toothed wheel 62 rotates in this direction with the shaft and drives the second (large) toothed wheel 66, which in turn drives the output shaft 69 anti-clockwise. The arrows drawn with dashed lines in Figure 3b illustrate how the small toothed wheels in the second case are driven by the output shaft without any transfer of power whereby the first small toothed wheel 63 rotates freely in the opposite direction relative to the input shaft. The input driven rotation at the intermediate rollers 24, 25 in Figure 1 can in this manner be used to achieve rotation 33, 34, 35 at the film rollers 10, 11 and the storage roller 12 that always operates in the direction of winding up of the rollers 10, 11, 12, independently of whether the driven rotation at the intermediate rollers operates in the direction of input 30 or in the direction of output 32. The rotations 33, 34 35 in the direction of winding up of the rollers 10, 11, 12 is used to influence the rollers through slip clutches, such that the films are placed under tension. The banknote handling arrangement in Figure 1 was illustrated with two transport films. Figure 6 illustrates a single-band unit with only one transport film. The unit comprises a transport film 18 that, as has been previously described, is wound up 14 around a first roller or film roller 10. It is appropriate that one end of the film 18 is attached to the film roller 10. The other end of the first film 18 it attached to and wound up 16 around a storage roller 12. During input 30 of a banknote 26, the banknote is received between a driven intermediate roller 24, over which the film 18 passes, and an input wheel or an input roller 36, and it is stored between the film 18 and its wound-up section 16, through winding up of the film 18 around the storage roller 12. The driving of the intermediate driving roller 24 and the input roller 36 can be arranged as has been previously described for the intermediate rollers 24, 25 and the film roller 10, and the storage roller 12 can place the film 18 under tension with the aid of a tensioning arrangement such as a slip clutch. The film is held under tension also here in that the roller, the film roller 10 or the storage roller 12, that is being unwound interacts with the tensioning arrangements in its direction of winding up while it is unwound. The tensioning arrangement according to the invention that has been described can also be used in arrangements in which the film rollers and the storage roller are driven, as is illustrated in Figure 7. Instead of monitoring the tension of the films with sensors and driving the rollers such that they place the films under tension when the sensors have revealed that the films have become slack, as has been carried out in arrangements according to the prior art (such as, for example, US 4,249,552 described above), the non-driven rollers can interact with a tensioning arrangement in their direction of winding up during their unwinding. The arrangement shown in Figure 7 can be modified, as an example of this, according to the invention such that the films 102, 103 can be held under tension when a banknote 101 is fed into the arrangement through the storage roller 104 being driven in its direction of winding up, by an interaction between the film rollers 105, 106 and a tensioning arrangement according to the present invention in the direction of their winding up. The arrangement can in the same manner be modified such that the films can be held under tension when a banknote is fed out from the arrangement by the driving of the film rollers 105, 106 through the storage roller 104 interacting in its direction of winding up, by a tensioning arrangement according to the present invention. It is ensured in this manner that the films are held under tension whenever they are driven. An arrangement can be designed in a simplified variant without any intermediate roller and having only a single film, i.e. comprising a first roller 10, a storage roller 12 and a transport film 18 between them. The storage roller is driven in such a design during input of banknotes and the first roller interacts with a tensioning arrangement in its direction of winding up while it at the same time is unwound. The first roller can in a similar manner be driven during output, such that it drives the transport film while the storage roller is unwound while the storage roller at the same time interacts with a tensioning arrangement in the direction of its winding up. Figures 4 and 5 illustrate machines for valuable documents such as banknote machines equipped with arrangements for the handling of valuable documents such as banknotes according to the present invention. The machines can be used at, for example, cash desks, where they are connected to the other equipment, such as the cash till, bar-code reader, coin dispenser, computer, etc. Valuable documents such as value coupons, coupons, gift vouchers and banknotes are stored in these. The machines comprise the cover with one or several openings for banknotes. Figure 4 illustrates a machine for valuable documents with a banknote machine 70 with an opening 71 for the input and output of valuable documents such as banknotes and a reception plate 72 for the banknotes. Five storage arrangements 73, 74, 75, 76, 77 for five different banknote denominations are arranged in the banknote machine. Banknotes of different denominations are fed in through the opening 71, sorted according to their denomination, and then stored in the storage arrangement 73, 74, 75, 76, 77 intended for the denomination. At least one of these storage arrangements comprises a banknote handling arrangement according to the present invention. The banknote machine is also equipped with a sorting arrangement comprising what are in themselves known arrangements for the determination of denomination and the confirmation of authenticity, banknote guides, and a control unit to which the arrangement for determination of denomination and the confirmation of authenticity and the banknote guide are connected. Figure 5 illustrates a machine for valuable documents with a banknote machine 80 with openings 86, 87, 88, 89, 90 for different denominations of banknotes. Storage arrangements 81 , 82, 83, 84, 85 for banknotes of different denominations are arranged in the banknote machine. At least one of these storage arrangements comprises a banknote handling arrangement according to the present invention. During input of banknotes through any one of the openings, the banknotes are received by the storage arrangement 81 - 85 in question in a banknote exchange region at the opening 86 - 90, and transported to a storage location (at 16 in Figure 1). The machine may also comprise arrangements for the confirmation of authenticity. The machines for valuable documents according to the present invention preferably also comprise connections to power supply, such as the electric grid, and equipment for communication with other units such as, for example, a computer unit at a cash desk. The number of storage arrangements can be adapted for each currency, with, for example, four storage arrangements for the most common denominations and one for uncommon denominations or for other valuable documents such as cheques and gift vouchers. The invention has been described with embodiments in order to explain its principles and application, in order to make it possible for others skilled in the arts to realise the invention, with suitable modifications within the framework of their skills. The scope of the invention should be limited only by the attached claims.