Device for correcting a deformation in at least one material web

Abstract

A device for correcting a deformation inside at least one material web in the machine direction of the at least one material web comprises at least one roller body seated rotatably about an axis of rotation for guiding the at least one material web, and at least one rigid shaft that is arranged in the interior of the roller body. The rigid shaft is divided in the direction of the axis of rotation axis into a first part and a second part, the first part and the second part each having at least one curvature. The first part and the second part are rotatable and/or pivotable independently of one another, so that the roller body can be adjusted between at least a first and a second external shape.

1 . A device for correcting a deformation inside at least one material web in the machine direction of the at least one material web, the device comprising:
 at least one roller body rotatably seated about an axis of rotation for guiding the at least one material web, and   at least one rigid shaft that is arranged in the interior of the roller body,   wherein the rigid shaft is subdivided in the direction of the axis of rotation into a first part and a second part,   wherein the first part and the second part each have a curvature, and   wherein the first part and the second part are rotatable or pivotable independently of one another so that the roller body can be adjusted between at least a first and a second external shape.   
     
     
         2 . The device according to  claim 1 , wherein, by adjusting the roller body between the at least first and the second external form, the device is adaptable to a type of deformation inside the material web guided on the at least one roller body. 
     
     
         3 . The device according to  claim 1 , wherein the first external shape of the roller body is suitable to correct a first type of deformation inside the material web guided on the at least one roller body, and
 wherein the second external shape of the roller body is suitable to correct a second type of deformation inside the material web guided on the at least one roller body.   
     
     
         4 . The device according to  claim 1 , wherein the first external shape is substantially S-shaped. 
     
     
         5 . The device according to  claim 1 , wherein the second external shape is substantially arc-shaped. 
     
     
         6 . The device according to  claim 3 , wherein the first type of deformation is substantially S-shaped. 
     
     
         7 . The device according to  claim 6 , wherein the second type of deformation is substantially arc-shaped. 
     
     
         8 . The device according to  claim 1 , further comprising at least a first drive and a second drive, wherein the first part of the shaft can be rotated and/or pivoted by the first drive, and wherein the second part of the shaft can be rotated and/or pivoted by the second drive. 
     
     
         9 . The device according to  claim 8 , wherein the first drive is suitable to rotate and/or pivot the first curved part of the shaft about the longitudinal axis of the first curved part, and
 wherein the second drive is suitable to rotate and/or pivot the second curved part of the shaft about the longitudinal axis of the second curved part.   
     
     
         10 . The device according to  claim 1 , wherein the shaft is arranged in the interior of the roller body in such a manner that the shaft is subdivided in the direction of the axis of rotation in the center of the roller body. 
     
     
         11 . The device according to  claim 1 , wherein the shaft is rotatably and pivotably seated at both ends. 
     
     
         12 . The device according to  claim 1 , wherein the device is suitable to guide the at least one material web on the roller body in such a manner that the at least one material web is deflected by an angle of at least 90°, more particularly at least 120°, more particularly roughly 180°. 
     
     
         13 . The device according to  claim 1 , wherein the roller body comprises an elastic material. 
     
     
         14 . The device according to  claim 1 , further comprising a camera, wherein the device is configured in such a manner that the first part and/or the second part of the shaft can be pivoted or rotated based on the signal acquired by the camera. 
     
     
         15 . The device according to  claim 1 , wherein the deformation is a deformation of weft threads of the material web or a distortion of a pattern of the material web. 
     
     
         16 . The device according to  claim 1 , wherein the first part and the second part are rotatable and pivotable independently of one another so that the roller body can be adjusted between at least the first and the second external shape.