Retractor device

Abstract

The invention involves a spreading device ( 1 ) for multiple material sheet strips ( 4 ) cut from a material sheet ( 5 ) by a material sheet cutting device. The material sheet strips ( 4 ) are fed to the spreading device ( 1 ) along a transport path in order to be subsequently transported, offset parallel to one another, to a winding shaft arrangement and to be wound onto a common winding shaft. The spreading device ( 1 ) comprises two deflection elements ( 2 and 3 ), which each extend transversely to the transport path and are configured and arranged such that a strip spacing ( 9 ) between two adjacent to one another along a transport path are successively enlarged over the first and second deflection elements ( 2 and 3 ) of the guided material sheet strips ( 4 ). The deflection elements ( 2, 3 ) are arranged in a rotationally fixed manner. Each deflection element ( 2 and 3 ) comprises a number of openings ( 15 ) in a transport contact area ( 13 ) of a deflection sheath surface ( 12 ) of the deflection elements ( 2 and 3 ) covered by the material sheet strips ( 4 ) transported over it, through which compressed air can be blown in order to create a friction-reducing air layer between the material sheet strips ( 4 ) and the deflection sheath surfaces ( 12 ) of the deflection elements ( 2 and 3 ) in the transport contact area ( 13 ).

1 . A spreading device ( 1 ) for multiple material sheet strips ( 4 ) cut from a material sheet ( 5 ) by a material sheet cutting device, wherein the material sheet strips ( 4 ) are fed to the spreading device ( 1 ) along a transport path in a feed plane ( 6 ) and leave the spreading device ( 1 ) in a discharge plane ( 7 ) in order to be subsequently transported, offset parallel to one another, to a winding shaft arrangement and to be wound onto a common winding shaft, wherein the spreading device ( 1 ) comprises two deflection elements ( 2  and  3 ), which each extend transversely to the transport path and are configured and arranged such that a strip spacing ( 9 ) between two material sheet strips ( 4 ) guided adjacent to one another along a transport path in succession over the first and second deflection elements ( 2  and  3 ) is greater in the discharge plane ( 7 ) than in the feed plane ( 6 ), wherein the deflection elements ( 2  and  3 ) are arranged to be non-rotatable, and in that each deflection element ( 2  and  3 ) comprises a number of openings ( 15 ) in a transport contact area ( 13 ) of a deflection sheath surface ( 12 ) of the deflection elements ( 2  and  3 ) covered by the material sheet strips ( 4 ) transported thereover, through which compressed air can be blown in order to create a friction-reducing air layer between the material sheet strips ( 4 ) and the deflection sheath surfaces ( 12 ) of the deflection elements ( 2  and  3 ) in the transport contact area ( 13 ), wherein:
 the two deflection elements ( 2 ,  3 ) are arranged and configured such that the feed plane ( 6 ) and the discharge plane ( 7 ) are offset parallel to each other, and 
 the deflection elements ( 2 ,  3 ) are configured such that the material sheet strips ( 4 ) are transported between the two deflection elements ( 2 ,  3 ) at least approximately at a right angle relative to the feed plane ( 6 ) and the discharge plane ( 7 ). 
 
     
     
         2 . The spreading device ( 1 ) according to  claim 1 , characterised in that the deflection sheath surfaces ( 12 ) or the transport contact surfaces ( 13 ) of the deflection elements ( 2  and  3 ) are made of a porous and air-permeable material. 
     
     
         3 . The spreading device ( 1 ) according to  claim 1 , characterised in that the deflection sheath surfaces ( 12 ) or the transport contact surfaces ( 13 ) of the deflection elements ( 2  and  3 ) are made from a perforated sheet metal or from a perforated thin-walled material layer. 
     
     
         4 . The spreading device ( 1 ) according to  claim 3 , characterised in that the deflection sheath surfaces ( 12 ) or the transport contact surfaces ( 13 ) of the deflection elements ( 2  and  3 ) have a number of holes with an opening diameter of less than 0.5 mm, preferably less than 0.2 mm. 
     
     
         5 . The spreading device ( 1 ) according to  claim 1 , characterised in that the two deflection elements ( 2  and  3 ) are arranged and designed configured such that the feed plane ( 6 ) and the discharge plane ( 7 ) are offset parallel to one another. 
     
     
         6 . The spreading device ( 1 ) according to  claim 1 , characterised in that the deflection elements ( 2  and  3 ) are configured in the shape of a segment of a circle in a cross-sectional area extending along the transport path. 
     
     
         7 . The spreading device ( 1 ) according to  claim 1 , characterised in that a deflection sheath surface ( 12 ) of each deflection element ( 2  and  3 ) has a deflection curvature along the transport path of a material sheet strip ( 4 ) and, transversely to the transport path, a deflection curvature extending over all material sheet strips ( 4 ). 
     
     
         8 . The spreading device ( 1 ) according to  claim 7 , characterised in that the spreading curvature of a deflection element ( 2  and  3 ) which extends over all material sheet strips ( 4 ) is formed by subsequent reshaping of a deflection element blank that is not initially curved in a spreading direction. 
     
     
         9 . The spreading device ( 1 ) according to  claim 1 , characterised in that the deflection sheath surfaces ( 12 ) of the two deflection elements ( 2  and  3 ) form a wrap-around section of the same size for each material sheet strip ( 4 ) along the transport path.