Deskewing device for corrugated cardboard manufacturing system

Abstract

A deskewing device for a moving web of material in a corrugated cardboard manufacturing system incorporates a plurality of successive processing units that are equipped with processing tools, which are movable crosswise to the direction of conveyance of the web of material. A skew measuring device is provided to determine the skew of the web of material. It has a first position sensor, at least one second position sensor, which determine the transverse position of the web of material at predetermined longitudinal positions. A control unit is used to calculate from the data of the position sensors the skew of the web of material and the transverse position of the processing tools is corrected accordingly.

What is claimed is  
     
         1 . A deskewing device for a moving web of material ( 2 ), especially a sheet of paper in a paper processing machine, such as, e.g., a corrugating machine, comprising 
 a) a web of material ( 2 ) to be transported along a desired direction of conveyance ( 3 ) and transported along an actual direction of conveyance ( 46 );    b) at least one processing unit ( 4 ,  5 ,  6 ,  7 ,  8 ) for processing the web of material ( 2 ) wherein the at least one processing unit ( 4 ,  5 ,  6 ,  7 ,  8 ) incorporates at least one processing tool ( 11 ,  24 ,  25 ,  26 ,  27 ,  35 ), 
 i) which is movable crosswise to the desired direction of conveyance ( 3 ) by means of an actuating drive ( 30 ),  
 ii) which can be brought into engagement with the web of material ( 2 ), and  
 iii) which is disposed at an actual transverse position yIST w  and at a longitudinal tool position x w ;  
   c) a skew measuring device for determining the actual direction of conveyance ( 46 ) of the web of material ( 2 ), wherein the skew measuring device incorporates 
 i) at least one first position sensor ( 40 ,  40 ′;  12 ) disposed at a first longitudinal the web of material ( 2 ), and  
 ii) at least one second position sensor ( 40 ;  40 ′;  40 ″) disposed at a second longitudinal position x s2  to determine a second transverse position y s2  of the web of material ( 2 ), and  
   d) a control unit ( 43 ), 
 i) which is connected in a data-transferring manner to the at least one first position sensor ( 40 ;  40 ′;  12 ), the at least one second position sensor ( 40 ;  40 ′;  40 ″), and the at least one actuating drive ( 30 ), and  
 ii) which is designed in such a way that its actual direction of conveyance ( 46 ) is determined from the first transverse position y s1  and second transverse position y s2  of the web of material ( 2 ), that the desired transverse position ySOLL w  of the at least one processing tool ( 11 ,  24 ,  25 ,  26 ,  27 ,  35 ) is determined from that actual direction of conveyance ( 46 ), and the at least one actuating drive ( 12 ,  30 ) for shifting the corresponding processing tool ( 11 ,  24 ,  25 ,  26 ,  27 ,  35 ) into the desired transverse position ySOLL w  is actuated.  
   
     
     
         2 . A device according to  claim 1 , wherein the web of material ( 2 ) has two lateral edges ( 9 ).  
     
     
         3 . A device according to  claim 2 , wherein the position sensors ( 40 ;  40 ′;  12 ,  40 ″) are designed such that they determine the transverse position of at least one edge ( 9 ) of the web of material ( 2 ).  
     
     
         4 . A device according to  claim 3 , wherein the position sensors ( 40 ;  40 ′;  12 ,  40 ″) measure the transverse position of both edges ( 9 ) of the web of material ( 2 ).  
     
     
         5 . A device according to  claim 1 , wherein the actuating drive ( 30 ) incorporates a drivable threaded spindle ( 29 ).  
     
     
         6 . A device according to  claim 5 , wherein the at least one processing tool ( 11 ,  24 ,  25 ,  26 ,  27 ,  35 ), to shift it crosswise, can be coupled to the threaded spindle ( 29 ).  
     
     
         7 . A device according to  claim 2 , wherein a processing unit ( 4 ) is designed as a unit for cutting the edges ( 9 ) of the web of material ( 2 ).  
     
     
         8 . A device according to  claim 7 , wherein the unit for cutting the edges ( 9 ) incorporates cutters ( 11 ) that are positionable by a cutter actuating drive ( 12 ) into a predetermined crosswise cutter position y M .  
     
     
         9 . A device according to  claim 8 , wherein the cutter actuating drive ( 12 ) forms the at least one first position sensor ( 12 ).  
     
     
         10 . A device according to  claim 1 , wherein the at least one first position sensor ( 40 ;  40 ′;  12 ) and the at least one second position sensor ( 40 ;  40 ′;  40 ″) are disposed at different longitudinal positions x s1  and x s2  of the web of material ( 2 ).