Method for threading a material web into a rewinder and rewinder

Abstract

Rewinder and Method for threading a material web into a rewinder, in which the start of the material web is drawn off a supply roll at full width by an auxiliary device in order to improve automation possibilities. Further, provision is made for the material web to be fed to a winding position at full width and for the auxiliary device to be released from the material web in the region of the winding position.

1 . A method for threading a material web into a rewinder, in which the start of the material web is drawn off a supply roll at full width by means of an auxiliary device, wherein the material web is fed to a winding position at full width and the auxiliary device is released from the material web in the region of the winding position.  
     
     
         2 . The method as claimed in  claim 1 , wherein the material web is led through a slitter, the slitter being opened before the passage of the auxiliary device.  
     
     
         3 . The method as claimed in  claim 2 , wherein the slitter is closed after the passage of the auxiliary device and produces at least one longitudinal cut in the material web before the auxiliary device reaches the winding position.  
     
     
         4 . The method as claimed in  claim 3 , wherein the auxiliary device draws the material web further after reaching the winding position until the longitudinal cut reaches the winding position.  
     
     
         5 . The method as claimed in  claim 4 , wherein the material web is wound onto the auxiliary device in the region of the winding position until the longitudinal cut reaches the winding position.  
     
     
         6 . The method as claimed in  claim 1 , wherein the material web is held firmly in the region of the winding position, the material web is severed between the winding position and the auxiliary device and the auxiliary device is moved to a disposal position.  
     
     
         7 . The method as claimed in  claim 1 , wherein the auxiliary device is moved in a circuit from a pick-up position to the winding position and back.  
     
     
         8 . A rewinder having an unwind station which has at least one position for a supply roll, a winding station having at least one winding position and an auxiliary device which grips a material web from the supply roll at full width in the region of the unwind station, wherein the auxiliary device ( 21 ) can be moved from the unwind station ( 2 ) as far as the winding station ( 3 ), into the region of the winding position ( 12 ).  
     
     
         9 . The rewinder as claimed in  claim 8 , wherein, between the unwind station ( 2 ) and the winding station ( 3 ), there is arranged a slitter ( 4 ), the slitter ( 4 ) having a cutting state, in which it produces at least one longitudinal cut in the material web ( 9 ) passing through, and a passage state, in which the auxiliary device ( 21 ) can be moved through the slitter ( 4 ).  
     
     
         10 . The rewinder as claimed in  claim 9 , wherein the slitter ( 4 ) has two crossmembers ( 30 ,  32 ), of which at least one can be displaced relative to the other.  
     
     
         11 . The rewinder as claimed in  claim 8 , wherein the auxiliary device ( 21 ) is guided on two movement paths ( 22 ) which are arranged transversely with respect to the direction of movement of the material web ( 9 ) and at a predetermined distance from each other.  
     
     
         12 . The rewinder as claimed in  claim 11 , wherein the movement paths ( 22 ) are arranged laterally outside the material web.  
     
     
         13 . The rewinder as claimed in  claim 11 , wherein the movement paths ( 22 ) of the auxiliary device are led in a circuit.  
     
     
         14 . The rewinder as claimed in  claim 11 , wherein the movement paths ( 22 ) are designed for a bidirectional movement.  
     
     
         15 . The rewinder as claimed in  claim 11 , wherein a transport device is guided along at least one movement path.  
     
     
         16 . The rewinder as claimed in  claim 8 , wherein a crosscutter ( 35 ) which acts on the material web ( 9 ) between the auxiliary device ( 21 ) and the winding position ( 12 ) is arranged in the region of the winding position ( 12 ).  
     
     
         17 . The rewinder as claimed in  claim 8 , wherein the unwind station ( 2 ) has a preparation position ( 14 ), underneath which a pulper opening ( 19 ) is arranged, it being possible for the auxiliary device ( 21 ) to be moved through a region between the preparation position ( 14 ) and the pulper opening ( 19 ).  
     
     
         18 . The rewinder as claimed in  claim 17 , wherein a crosscutter ( 23 ) is arranged in the region.  
     
     
         19 . The rewinder as claimed in  claim 18 , wherein the crosscutter ( 23 ) has a dividing region which can be displaced in the direction of movement of the material web.  
     
     
         20 . The rewinder as claimed in  claim 8 , wherein the auxiliary device ( 21 ) has suction openings and/or clamping means.  
     
     
         21 . The rewinder as claimed in  claim 8 , wherein an activation device acting on the auxiliary device ( 21 ) is arranged in the region of the unwind station ( 2 ).  
     
     
         22 . The rewinder as claimed in  claim 21 , wherein the activation device is constructed as a rotational drive which can be brought into an operative connection with the auxiliary device ( 21 ).  
     
     
         23 . The rewinder as claimed in  claim 8 , wherein a rotational drive that can be brought into an operative connection with the auxiliary device ( 21 ) is arranged in the region of the winding position.  
     
     
         24 . The rewinder as claimed in  claim 8 , wherein a splice station ( 37 ) is arranged between the unwind station ( 2 ) and the slitter ( 4 ).  
     
     
         25 . The rewinder as claimed in  claim 8 , wherein the auxiliary device can be moved in a space below a floor level ( 43 ) on which the unwind station ( 2 ) and the winding station ( 3 ) are arranged.