Abstract:
A roll storage system for guiding a number of sheet members. The roll storage system includes a housing that encloses a supply roll and a storage roll. The supply and storage roll are rotatably mounted for guiding a storage film between them. A guide member is also mounted for guiding each of the number of sheet members into and away from the storage roll.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The invention relates to a roll storage system for sheet-like objects, in particular banknotes, having a housing, in which a supply roll for a storage film and a storage roll connected to said supply roll are mounted so that they can rotate, and each roll is coupled to a roll drive, the storage film being guided between the supply roll and the storage roll over at least one deflection roller, and having a guide device for guiding sheet-like objects into and out of the coil on the storage roll. 
   2. Description of the Prior Art 
   Such a roll storage system is disclosed, for example, by German Patent Document No. 30 42 566 C2. In the solution described there, the guide device is formed by a pair of stationary rollers arranged close to the inlet slot of the housing, the storage film being guided over one of these rollers. The banknotes running in through the inlet slot of the housing thus pass onto the storage film and into the coil on the storage roll. However, guidance of the banknotes running in is only ensured as long as the distance between the roller gap of the stationary pair of rollers and the point at which the storage film runs onto the coil of the storage roll is shorter than the dimension of the banknote in the conveying direction. This requirement limits the difference in diameter of the storage-roll coil which can be used for the storage, and consequently limits the storage capacity of the storage roll. 
   Guiding the banknotes, which is independent of the abovementioned distance, between the stationary pair of rollers and the point at which the storage film runs onto the storage-roll coil can be achieved by using two storage films, which are led together on the stationary pair of rollers and which enclose the banknotes running in between them. However, this solution, also described in German Patent Document No. 30 42 566 C2, has the disadvantage that two supply rolls are needed, with a corresponding drive mechanism, and that the storage-roll coil becomes thicker as a result of the dual film. Overall, although this means that the entire diameter range of the storage-roll coil can be used for the storage of banknotes, this is achieved at the expense of a relatively high technical outlay. 
   SUMMARY OF THE INVENTION 
   The invention is based on the object of specifying a roll storage system of the type mentioned at the beginning which, with a lower overall size and low technical outlay, has a relatively high storage capacity. 
   According to the invention, this object is achieved in that the guide device includes a conveyor table which can be pivoted about a pivot pin fixed to the housing and can be adjusted parallel to the conveying direction, on which table there is arranged a transfer conveyor for guiding sheet-like objects into the coil and for removing sheet-like objects from the coil on the storage roll. 
   As a result of the conveyor table being arranged such that it can pivot, its plane can always be set, as the coil diameter changes, in such a way that it is oriented tangentially to the surface of the coil. The change, which occurs with the change in coil diameter, in the distance between an entry point for the sheet-like objects on the housing and the point at which the storage film runs onto the surface of the coil is compensated for by adjusting the conveyor table parallel to the conveying direction. This ensures that the sheet-like objects are guided independently of the current coil diameter, so that a significantly greater part of the coil diameter can be used for the storage of sheet-like objects than was previously used. Trials have shown that, with the solution according to the invention, the storage capacity of the roll storage system operating with a storage film can be increased by 100% over conventional solutions. 
   The conveyor table is preferably guided by at least one extension in a slot guide fixed to the housing, in such a way that during a pivoting movement it is forcibly displaced parallel to the conveying direction. At the same time, the transfer end of the conveyor table, remote from the pivot pin, is expediently biased so as to rest on the coil on the storage roll, so that the position of the conveyor table is automatically adapted to the coil diameter. 
   In a preferred embodiment of the invention, the transfer conveyor includes a belt conveyor having an endless belt and supporting and back-pressure rollers interacting therewith. The endless belt is guided over a first roller, mounted coaxially with respect to the pivot pin of the conveyor table, and over a second roller, mounted on the conveyor table. The result of the translational adjustment of the conveyor table relative to the pivot pin is that the length of the endless belt must also change. Although this could, in principle, be counterbalanced by the use of an elastic endless belt, provided the adjustment travel is not very large, it is more expedient for the endless belt of the belt conveyor to be guided over a tensioning device which ensures that the tension, and therefore also the transporting properties of the endless belt, always remain constant. 
   This solution therefore ensures that the distance between the discharge end of the transfer conveyor and the transfer end of the conveyor table always remains constant, irrespective of the coil diameter of the storage roll and the distance between the entry point of the sheet-like objects on the storage housing and the point at which the storage film runs onto the storage-roll coil. 
   The second roller of the belt conveyor is preferably arranged coaxially with respect to a deflection roller of the storage film and is fixed so that it rotates with said roller, so that the belt conveyor is driven by the storage film. This dispenses with a dedicated drive for the transfer conveyor and any necessary synchronization of such a drive with the drive of the storage roll. 
   Further features and advantages of the invention emerge from the following description which, in conjunction with the appended drawings, explains the invention using an exemplary embodiment. 

   
     DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows a schematic side view of the roll storage system according to the invention in the direction of the axis of the storage roll, with a small diameter of the storage-roll coil. 
       FIG. 2  shows a view corresponding to  FIG. 1  with a maximum diameter of the storage-roll coil. 
       FIG. 3  shows a schematic view of the conveyor table from below, i.e. in the direction of the arrow A in  FIG. 1 . 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENT 
   The roll storage system illustrated in  FIGS. 1 and 2  includes a housing  10 , in which a supply roll  12  and a storage roll  14  are mounted such that they can rotate about pins  16  and  18  fixed to the housing. A storage film  20  is connected both to the supply roll  12  and to the storage roll  14  and can be wound between these two rolls, forming a supply coil  22  and a storage-roll coil  24 , respectively. For this purpose, the rolls  12  and  14  are connected to suitable drive devices (not illustrated). The storage film is guided between the supply roll  12  and the storage roll  14  over stationary deflection rollers  26 ,  28 ,  30  and a movable deflection roller  32  ( FIG. 3 ), which is mounted on a conveyor table (designated in general terms by  34 ), which is to be explained in more detail in the following text. 
   The conveyor table  34  has a frame  36  which, when the conveyor table  34  is adjusted between the positions illustrated in  FIGS. 1 and 2 , simultaneously executes a pivoting movement about a shaft  38  fixed to the housing and a translatory movement in the direction of the double arrow B, that is to say parallel to the conveying direction. For this purpose, the frame  36  has front and rear extensions  40 ,  42  which project laterally and engage in curved guide slots  44 ,  46  which are fixed in the housing, as is illustrated in  FIGS. 1 and 2 . 
   Furthermore, the conveyor table  34  comprises a transfer conveyor  48  for transferring banknotes to the storage-roll coil  24  and, respectively, for removing banknotes from the storage-roll coil  24 . The transfer conveyor comprises a belt conveyor  50  having an endless belt  52 . The latter is guided over two first rollers  54 , mounted such that they can rotate at an axial distance from each other on the pivot shaft  38 , and second rollers  56  which, together with the movable deflection roller  32 , are mounted so that they can rotate on a shaft  58 , which is held in the frame  36  of the conveyor table  34 . 
   If the frame  36  of the conveyor table  34  is adjusted in the direction of the double arrow B, the distance between the shafts  38  and  58  changes. In order to keep the tension on the endless belt  52  constant during this change in the distance, in each case a tensioning device is provided, including two deflection rollers  59  and a tensioning roller  60 , which is mounted on a pivoting lever  64  which is mounted such that it can pivot about a pivot pin  62  on the frame  36 . The pivoting lever  64  is biased by a tension spring  66  in the direction of the arrow C in  FIG. 3 . 
   Pairs of rollers, which each include a supporting roller  68  supporting the endless belt and a back-pressure roller  70  in each case assigned to said supporting roller, interact with the top run of the endless belt  52 , the rollers  68  and  70  being mounted on the frame  36  such that they can rotate about pins  72  and  74 , respectively. 
   In the state of the roll storage system illustrated in  FIG. 1 , the storage film  20  has been wound completely onto the supply roll  12 . The storage-roll coil  24  thus has its smallest diameter. In this position, the conveyor table  34 , under the action of a tension spring  76 , which acts on the one hand on a point  78  fixed to the housing and on the other hand on an extension  80  of the frame  36 , assumes its uppermost position, in which the conveyor table  34  rests on the surface of the storage-roll coil  24 . In this position, the shafts  38  and  58  of the belt conveyor  50  are at their greatest distance from each other. 
     FIG. 2  shows the roll storage system in a state in which the storage-roll coil  24  has its greatest diameter. As a result of the growing storage-roll coil  24 , the conveyor table  34  resting on its surface is pressed downward counter to the force of the tension spring  76 . During this downward pivoting movement, the frame  36  is displaced in the direction of the pivot shaft  38  as the result of the extensions  40  and  42  sliding in the slot guides  44 ,  46 . 
   Since the belt conveyor  50 , just like the shaft  58 , is arranged on the frame  36  of the conveyor table  34 , said belt conveyor follows the movement of the latter. This means that the distance of the gap, formed between the back-pressure rollers  70  and the supporting rollers  68 , from the point at which the storage film  20  runs onto the storage-roll coil  24  always remains constant. As a result, irrespective of the diameter of the storage-roll coil  24 , a favorable guidance is constantly maintained for the sheet-like objects as they run onto the storage-roll coil  24  or during the removal operation from the storage-roll coil  24 . It is therefore possible to use a greater difference between the smallest coil diameter and the largest coil diameter of the storage-roll coil. Given the same overall size of the roll storage system as a whole, it is thus possible for the storage volume to be increased considerably. 
   Although modifications and changes may be suggested by those skilled in the art, it is the intention of the inventors to embody within the patent warranted hereon all changes and modifications as reasonably and properly come within the scope of their contribution to the art.