Machine and method for processing textile fabrics

Abstract

The machine comprises: an advancement path of said web (T); at least one abrasive member, essentially cylindrical, rotating and abrasive ( 1 ) the advancement path on which the material is guided; a means ( 3 ) for feeding said web material to said cylindrical member; and a means for distancing ( 11 ) said web material from said cylindrical member. The cylindrical member is associated a mobile guiding element ( 23, 25 ) on which the web material is guided, whose position varies with the variation of the contact arch between the web material and the cylindrical member. The speed of at least one of said feeding and distancing means is controlled according to the position of said mobile guide element.

1 . A machine for processing a web material, in particular a textile fabric, comprising: 
 an advancement path of said web material,    at least one substantially cylindrical rotating member along said advancement path on which the web material is guided,    a mean for feeding said web material to said cylindrical member, and    a mean for distancing said web material from said cylindrical member,    wherein: said cylindrical member is associated to a mobile guiding element on which the web material is guided, whose position varies with the contact arch between the web material and the cylindrical member; and in that the speed of at least one of said feeding and distancing means is controlled according to the position of said mobile guiding element.    
   
   
       2 . Machine according to  claim 1 , wherein the speed of the web material distancing mean is adjusted according to said position of the mobile guiding element.  
   
   
       3 . Machine according to  claim 1 , wherein the guiding element is downstream to said rotating cylindrical member, with respect to the direction of advancement of the web material along said advancement path, and the direction of the peripheral speed of the rotating cylindrical member is the same as the direction of advancement of the web material along said path.  
   
   
       4 . Machine according to  claim 2 , wherein the guiding element is downstream to said rotating cylindrical member, with respect to the direction of advancement of the web material along said advancement path, and the direction of the peripheral speed of the rotating cylindrical member is the same as the direction of advancement of the web material along said path.  
   
   
       5 . Machine according to  claim 1 , wherein the guiding element is arranged upstream to said rotating cylindrical member with respect to the direction of advancement of the web material on said advancement path; and the direction of the peripheral speed of the rotating cylindrical member is opposite to the direction of advancement of the web material along said path.  
   
   
       6 . Machine according to  claim 1 , including two cylindrical members in opposite directions, each of said cylindrical members being associated to a respective mobile guiding element and respective web material feeding and distancing means.  
   
   
       7 . Machine according to  claim 2 , including two cylindrical members rotating in opposite directions, each of said cylindrical members being associated to a respective mobile guiding element and respective web material feeding and distancing means.  
   
   
       8 . Machine according to  claim 3 , including two cylindrical members rotating in opposite directions, each of said cylindrical members being associated to a respective mobile guiding element and respective web material feeding and distancing means.  
   
   
       9 . Machine according to  claim 4 , including two cylindrical members rotating in opposite directions, each of said cylindrical members being associated to a respective mobile guiding element and respective web material feeding and distancing means.  
   
   
       10 . Machine according to  claim 5 , including two cylindrical members rotating in opposite directions, each of said cylindrical members being associated to a respective mobile guiding element and respective web material feeding and distancing means.  
   
   
       11 . Machine according to  claim 6 , wherein: 
 a first of said rotating cylindrical members turns in the direction of advancement of the web material and the respective guiding element is arranged downstream to said first cylindrical member with respect to the direction of advancement of the web material; and    the second of said rotating cylindrical members turns in the direction opposite to that of advancement of the web material and the respective guiding element is arranged upstream to said second cylindrical member with respect to the direction of advancement of the web.    
   
   
       12 . Machine according to  claim 11 , wherein said two rotating cylindrical members are arranged to process two opposite sides of the web.  
   
   
       13 . Machine according to  claim 12 , wherein a respective mobile guiding element is associated to each of said rotating cylindrical members, each mobile guiding element being arranged downstream to the respective rotating cylindrical member with respect to the direction of advancement of the web material.  
   
   
       14 . Machine according to  claim 1 , wherein each guiding element is supported by a articulated pivoting arm on the rotating axis of said rotating cylindrical member.  
   
   
       15 . Machine according to  claim 11 , wherein each guiding element is supported by a articulated pivoting arm on the rotating axis of said rotating cylindrical member.  
   
   
       16 . Machine according to  claim 14 , wherein said pivoting arm is counterweighted.  
   
   
       17 . Machine according to  claim 1 , wherein said guiding element does not apply high tension on said web material.  
   
   
       18 . Machine according to  claim 1 , wherein the speed of said distancing means and/or said feeding mean is controlled to avoid applying a high tension on the web material.  
   
   
       19 . Machine according to  claim 1 , wherein said distancing mean is controlled by the position of said guiding element so that the contact arch between the web material and the cylindrical member does not exceed a presettable value.  
   
   
       20 . Machine according to  claim 1 , wherein said cylindrical member is an abrasive member.  
   
   
       21 . Machine according to  claim 11 , wherein said cylindrical member is an abrasive member.  
   
   
       22 . Machine according to  claim 1 , wherein said cylindrical member is a cylindrical brush.  
   
   
       23 . Machine according to  claim 22 , wherein said cylindrical brush includes abrasive bristles.  
   
   
       24 . Machine according to  claim 23 , wherein said abrasive bristles are made of filaments of synthetic material charged with granules of abrasive material.  
   
   
       25 . Machine according to  claim 22 , wherein the bristles of said brush are slanted with respect to a radial direction, the bristles being slanted in the opposite direction with respect to the direction of rotation of said brush.  
   
   
       26 . Machine according to  claim 1 , wherein a baffle is arranged along the advancement path of the web material, between either the feeding mean and the cylindrical member or the distancing mean and the cylindrical member to set the point of contact between the web material and the cylindrical member.  
   
   
       27 . Machine according at  claim 16 , wherein said arm is integral with a wheel around which a flexible member carrying a counterweight is turned.  
   
   
       28 . A method for the continuous processing of a web material, specifically textile fabric, comprising the following phases: 
 feeding said web material along an advancement path and around a rotating member which is essentially cylindrical and processes said web material;    distancing the web material from said cylindrical member, wherein the speed at which said web material is fed and/or distanced from the cylindrical member is controlled according to the contact arch between the cylindrical member and the web material.    
   
   
       29 . Method according to  claim 21 , characterized by: 
 providing a mobile guiding element of the web material along the feeding path next to the cylindrical member;    detecting the position of the mobile guiding element with respect to the cylindrical member; and    controlling the speed at which said web material is either distanced and/or fed to the cylindrical member according to the position of the mobile guiding element is controlled.