Automatic Device for Feeding Plastic Film for Packaging Machines

Abstract

An automatic device ( 1 ) is described for feeding a plastic film ( 4 ) for packaging machines ( 12 ) with miscellaneous products comprising means for feeding the plastic film ( 4 ); gripping and transporting means of the plastic film ( 4 ) comprising at least one dragging belt ( 5 ) adapted to get in contact with the plastic film ( 4 ) and to drag it in a packaging area ( 6 ) of the packaging machine ( 12 ); and command and control means adapted to unwind the plastic film ( 4 ) from the feeding means.

1 . An automatic device for feeding a plastic film for packaging machines with miscellaneous products wherein the automatic device comprises: 
 a) means for feeding the plastic film;    b) gripping and transporting means of the plastic film comprising at least one dragging belt adapted to get in contact with the plastic film and to drag it in a packaging area of the packaging machine; and    c) command and control means adapted to unwind the plastic film from the feeding means.    
   
   
       2 . The device of  claim 1 , wherein the feeding means comprise at least one coil.  
   
   
       3 . The device of  claim 1 , wherein the dragging belt is made of plastic or rubbery material.  
   
   
       4 . The device of  claim 1 , wherein the dragging belt is covered with plastic or rubbery material.  
   
   
       5 . The device of  claim 1 , wherein the dragging belt has a mirror polished surface for contacting the plastic film.  
   
   
       6 . The device of  claim 1 , wherein the command and control means comprise at least one first and one second rotating shaft, the first rotating shaft being driven by a motor for rotating the dragging belts.  
   
   
       7 . The device of  claim 1 , wherein the command and control means comprise a system for adjusting a length of the unwound plastic film.  
   
   
       8 . The device of  claim 7 , wherein the adjusting system comprises an Encoder cooperating with the motor.  
   
   
       9 . The device of  claim 7 , wherein the adjusting system comprises micro-switches actuated by variable abutments.  
   
   
       10 . The device of  claim 7 , wherein the adjusting system comprises timers with variable time.  
   
   
       11 . The device of  claim 1 , wherein the gripping and transporting means comprise a pressing rubbery roller cooperating with the first rotating shaft for gluing the plastic film to the dragging belts.  
   
   
       12 . The device of  claim 6 , wherein the gripping and transporting means comprise a pressing rubbery roller cooperating with the first rotating shaft for gluing the plastic film to the dragging belts.