Web guide control, web processing apparatus and method for operating the same

Abstract

A web guide control for guiding a web, the web guide control having a first guide roller ( 201 ) and a second guide roller wherein the first guide roller ( 201 ) comprises an adjustment unit ( 310 ), the second guide roller comprises a tension measurement unit ( 300 ), and the web guide control comprises a data connection for supporting the adjustment unit with tension data from the tension measurement unit.

1 . A web guide control for guiding a web, the web guide control having a first guide roller, and a second guide roller wherein
 the first guide roller comprises an adjustment unit;   the second guide roller comprises a tension measurement unit wherein the first guide roller is positioned downstream of the second guide roller with respect to the web guiding direction; and   the web guide control comprises a data connection for supporting the adjustment unit with tension data from the tension measurement unit.   
   
   
       2 . The web guide control according to  claim 1  wherein the tension measurement unit comprises a first tension sensor positioned at a first side of the second guide roller. 
   
   
       3 . The web guide control according to  claim 1  wherein the tension measurement unit comprises a second tension sensor positioned at a second side of the second guide roller. 
   
   
       4 . The web guide control according to  claim 1  wherein the adjustment unit comprises a motor for moving the first guide roller positioned at one side of the first guide roller. 
   
   
       5 . The web guide control according to  claim 1  wherein the adjustment unit is controlled using a closed-loop controller and the tension data is used as variable feedback signal. 
   
   
       6 . The web guide control according to  claim 5  wherein the closed-loop comprises analogue electronics. 
   
   
       7 . The web guide control according to  claim 5  wherein the closed-loop comprises digital electronics. 
   
   
       8 . A web processing apparatus having at least one web guide control for guiding a web, the web guide control having a first guide roller, and a second guide roller wherein
 the first guide roller comprises an adjustment unit;   the second guide roller comprises a tension measurement unit wherein the first guide roller is positioned downstream of the second guide roller with respect to the web guiding direction; and   the web guide control comprises a data connection for supporting the adjustment unit with tension data from the tension measurement unit.   
   
   
       9 . The web processing apparatus according to  claim 8  wherein the tension measurement unit comprises a first tension sensor positioned at a first side of the second guide roller. 
   
   
       10 . The web processing apparatus according to  claim 8  wherein the tension measurement unit comprises a second tension sensor positioned at a second side of the second guide roller ( 202 ). 
   
   
       11 . The web processing apparatus according to  claim 8  wherein the adjustment unit comprises a motor for moving the first guide roller positioned at one side of the first guide roller. 
   
   
       12 . The web processing apparatus according to  claim 8  wherein the adjustment unit is controlled using a closed-loop controller and the tension data is used as variable feedback signal. 
   
   
       13 . The web processing apparatus according to  claim 12  wherein the closed-loop comprises analogue electronics. 
   
   
       14 . The web processing apparatus according to  claim 12  wherein the closed-loop comprises digital electronics. 
   
   
       15 . The web processing apparatus according to  claim 8 , further comprising a coating unit for coating the web. 
   
   
       16 . A method for guiding a web comprising the steps of:
 adjusting the position of a first guide roller by moving one side of the first guide roller;   measuring the tension of the web acting on a second guide roller, thereby receiving measurement results, wherein the measuring is undertaken upstream of the adjusting with respect to the web guiding direction; and   wherein adjusting is based on the measurement results.   
   
   
       17 . The method according to  claim 16  wherein the measuring is undertaken at a first side of a second guide roller and at a second side of the second guide roller. 
   
   
       18 . The method according to  claim 16  wherein the adjusting is undertaken at one side of the first guide roller.