Method for controlling a storage roller and a storage roller for storing sheet-type objects

Abstract

In a method for controlling a storage roller for storing sheet-type objects, in particular banknotes, between the wound layers of a belt-type film, which is spooled to and fro between a film drum, which is driven by a first motor and comprises a film reservoir roll, and a winding drum, which is driven by a second motor and stores the sheet-type objects, the tension of the film is controlled to a predefined set value.

1 . A method for controlling a storage roller for storing sheet-type objects, in particular banknotes, between the wound layers of a belt-type film ( 22 ), which is spooled to and fro between a film drum ( 12 ), which is driven by a first motor ( 46 ) and comprises a film reservoir roll ( 24 ), and a winding drum ( 14 ), which is driven by a second motor ( 56 ) and stores the sheet-type objects ( 34 ), characterized in that the tension of the film ( 22 ) is controlled to a predefined set value.  
     
     
         2 . The method as claimed in  claim 1 , characterized in that the actual value of the film tension is measured directly.  
     
     
         3 . The method as claimed in  claim 1 , characterized in that the actual value of the film tension is calculated from the determined power consumption of the first motor ( 46 ) and the current radius and moment of inertia of the film drum ( 12 ).  
     
     
         4 . The method as claimed in one of  claims 1  to  3 , characterized in that the circumferential speed (v g ) of the winding drum ( 14 ) is controlled to a predefined set value.  
     
     
         5 . The method as claimed in  claim 4 , characterized in that the rotational speed of the second motor ( 56 ) is measured by means of an encoder ( 60 ) and, from this, the actual value of the circumferential speed (v g ) of the winding drum ( 14 ) and its angular position is calculated.  
     
     
         6 . The method as claimed in one of  claims 1  to  6 , characterized in that the rotational speed of the film drum ( 12 ) is measured.  
     
     
         7 . The method as claimed in one of  claims 4  to  6 , characterized in that the physically coupled control loops for the film tension (F) and for the circumferential speed (v g ) of the winding drum ( 14 ) are decoupled by means of a mathematical filter network, and in that the drive signals for the first and the second motor ( 46 ,  56 ) are calculated on the basis of the determined actual values for the film tension (F) and the circumferential speed (v g ) of the winding drum ( 14 ), the rotational speed of the film drum ( 12 ) and the predefined system parameters.  
     
     
         8 . A storage roller for storing sheet-type objects, in particular banknotes ( 34 ), comprising a film drum ( 12 ) that can be driven by a first motor ( 46 ), with a reservoir roll ( 24 ) of a belt-type film ( 22 ), a winding drum ( 14 ) that can be driven by a second motor ( 56 ), it being possible for the film ( 22 ) to be spooled to and fro between the film drum ( 12 ) and the winding drum ( 14 ), means ( 36 ) for supplying sheet-type objects ( 34 ) between the wound layers of the film ( 22 ) as the same is wound up onto the winding drum ( 14 ) and for dispensing the sheet-type objects ( 34 ) as the film ( 22 ) is unwound from the winding drum ( 14 ), and a control device ( 62 ) for driving the first and second motor ( 46 ,  56 ), characterized in that the control device ( 62 ) is designed to control the tension of the film ( 22 ) between the two drums ( 12 ,  14 ) to a predefined set value.  
     
     
         9 . The storage roller as claimed in  claim 8 , characterized in that the control device ( 62 ) is designed to control the circumferential speed (v g ) of the winding drum ( 14 ) to a predefined set value.  
     
     
         10 . The storage roller as claimed in  claim 8  or  9 , characterized by a device ( 64 ) for measuring the actual value of the film tension (F).  
     
     
         11 . The storage roller as claimed in  claim 10 , characterized in that the device for measuring the actual value of the film tension (F) is a strain gage ( 64 ).  
     
     
         12 . The storage roller as claimed in  claim 8  or  9 , characterized by means for registering the power consumption of the first motor ( 46 ) and means ( 62 ) for calculating the actual value of the film tension (F) from the registered data and the current radius and moment of inertia of the film drum ( 12 ).  
     
     
         13 . The storage roller as claimed in one of  claims 8  to  12 , characterized in that an encoder ( 60 ) is assigned to the second motor ( 46 ).  
     
     
         14 . The storage roller as claimed in one of  claims 8  to  13 , characterized in that an encoder ( 58 ) is assigned to the first motor ( 56 ).  
     
     
         15 . The storage roller as claimed in one of  claims 8  to  13 , characterized in that a tachometer is assigned to the film drum ( 12 ).  
     
     
         16 . The storage roller as claimed in one of  claims 9  to  15 , characterized in that the control device ( 62 ) contains a program-controlled computer which is  
       programmed in such a way that it calculates the function values of the resulting transfer functions, which correspond to the two control loops decoupled by a mathematical filter network, from the determined current and the predefined data and from this determines the drive signals for the first and the second motor ( 46 ,  56 ).