Film guiding assembly

Abstract

A film guiding assembly for guiding a plastic film during travel along a desired path includes at least two non-rotating turning bars over which the film passes, and an actuator for pivoting the turning bars to laterally shift the film. A sensor for senses the lateral position of the film downstream of the turning bars and operates to cause the actuator to pivot the turning bars when necessary to maintain the film leaving the guiding assembly in the desired path.

1 . A film guiding assembly for guiding a plastic film during travel along a desired path, said assembly including:
 at least two non-rotating turning bars over which the film passes;   an actuator for pivoting the turning bars to laterally shift the film; and   a sensor for sensing the lateral position of the film downstream of the turning bars and operable to cause the actuator to pivot the turning bars when necessary to maintain the film leaving the guiding assembly in the desired path.   
     
     
         2 . A guiding assembly according to  claim 1  wherein the actuator is also operable to move the turning bars to a loading position in which the film can be passed therebetween in a downward direction. 
     
     
         3 . A guiding assembly according to  claim 1  including further actuators operable to permit the turning bars to rotate during a start-up operation.