Filling machine

Abstract

Provided is a multitrack filling machine configured to obtain closed bags from a plurality of packing ribbons, including conveying means for the packing ribbon and a plurality of sacking stations, each including forming means, sealing means, filling means, cutting means, in which each sacking station includes driving means for the packing ribbon separated from the sealing means and including a dragging surface of high friction configured to interact by contact with the ribbon and to drag it along in the advancing direction.

1 . A multitrack filling machine configured to obtain closed bags from a plurality of packing ribbons, each of said packing ribbons defining a longitudinal direction and a direction perpendicular to said longitudinal direction, said packing machine comprising a plurality of sacking stations, each comprising forming means for said packing ribbon configured to fold a tranverse portion of one of said packing ribbons along a longitudinal direction, in a manner adapted to superpose two longitudinal flaps of said transverse portion of said packing ribbon, sealing means configured to seal said two superposed longitudinal flaps and seal said packing ribbon in the transverse direction, at given space intervals, filling means to fill an open bag formed with said packing ribbon longitudinally and transversely sealed, in such a manner that said transverse seal constitutes the bottom of said open bag,
 cutting means to cut said packing ribbon at said seal in the transverse direction, in such a manner that said seal in the transverse direction constitutes the bottom of said open bag and the head closure of the one closed bag obtained in the previous space interval of packing ribbon, said filling machine comprising   conveying means for said plurality of packing ribbons configured to convey said packing ribbons along an unrolling trajectory and an advancing or feeding direction in a manner configured to supply each of said sacking stations with one of said packing ribbons, wherein each of said sacking stations comprises   driving means for said packing ribbon separated from said sealing means and comprising a high-friction dragging surface configured to interact by contact with said packing ribbon and drive it in the advancing direction.   
     
     
         2 . The machine as claimed in  claim 1 , wherein said driving means comprises crawler tracks defining said dragging surface. 
     
     
         3 . The machine as claimed in  claim 2 , wherein said driving means comprises opposite crawler tracks. 
     
     
         4 . The machine as claimed in  claim 1 , wherein said forming device comprises a forming tube and is adapted configured to wrap said packing ribbon around said forming tube, and wherein said dragging surfaces are provided at said forming tube. 
     
     
         5 . The machine as claimed in  claim 1 , wherein said dragging surface is made of elastomer. 
     
     
         6 . The machine as claimed in  claim 1 , wherein said driving means of said different sacking stations is independently adjustable. 
     
     
         7 . The machine as claimed in  claim 1 , comprising tension sensors for the individual ribbons, configured to measure the tension of said individual ribbons. 
     
     
         8 . The machine as claimed in  claim 1 , wherein said conveying means comprises a deviation unit configured to deviate said packing ribbons through a right angle. 
     
     
         9 . The machine as claimed in  claim 1 , wherein said conveying means comprises pulling rollers upstream of said sacking stations, in timed relationship with said driving means and configured to drag said packing ribbons along. 
     
     
         10 . The machine as claimed in  claim 1 , further comprising
 tensioning rollers placed in the vicinity of said sacking stations and provided with an outer surface of high friction.