Curling device

Abstract

A curling device for a filter tip attachment comprises an element placed in contact with a strip of paper material advancing continuously along a given path, and serving to deform the strip in such a way that single tipping papers obtained by cutting the strip are invested with a curled profile; the curling device is associated with a mechanism such as will cause it to vibrate, describing rectilinear or looped trajectories at a predetermined frequency, so as to reduce friction between the curling element and the strip.

What is claimed:  
     
         1 ) a device for curling a continuous strip of paper material advancing along a predetermined feed path toward at least one cutting unit by which the selfsame strip is divided into discrete lengths, comprising: 
 at least one curling element operating on one surface of the advancing strip at a contact zone, in such a way as to deform the strip relative to its longitudinal dimension;    vibrator means associated with the curling element.    
     
     
         2 ) A device as in  claim 1 , wherein the curling element is set in motion by the vibrator means at a predetermined frequency and in a substantially rectilinear direction, transverse to the strip.  
     
     
         3 ) A device as in  claim 1 , wherein the curling element is set in motion by the vibrator means at a predetermined frequency and in a direction substantially parallel to the direction followed by the strip through the contact zone.  
     
     
         4 ) A device as in  claim 1 , wherein the curling element is set in motion by the vibrator means at a predetermined frequency and in such a way as to describe a trajectory determined by two directional components transverse one to the other.  
     
     
         5 ) A device as in  claim 1 , wherein the curling element is set in motion by the vibrator means at a predetermined frequency and in such a way as to describe a closed loop trajectory.  
     
     
         6 ) A device as in  claims 1  to  5 , wherein the vibrator means are electrical, mechanical or pneumatic in operation.  
     
     
         7 ) A device as in  claim 6 , wherein the vibrator means consist in an ultrasound vibrator device.