Machine for packaging articles into bags made of flexible material

Abstract

A machine for packaging articles into bags made of heat-sealable flexible material starting from a reel of a continuous web having two superimposed flat layers mutually permanently joined along one side and provided—along the other side—with an openable closure. The machine includes a device for supplying the web having a pair of superimposed parallel guide rollers arranged transversely on opposite sides with respect to the web and whose angular position with respect to the advancement direction of the web is adjustable. The two guide rollers have a superficial shape suitable to avoid both the formation of irregularities of the web—such as folds and creases—as well as the damaging of the openable closure.

What is claimed is: 
     
         1 . A machine for packaging articles into bags made of heat-sealable flexible material starting from a reel of a continuous web having two superimposed flat layers mutually permanently joined along one side, wherein the machine comprises:
 a supply device for supplying the web along an advancement direction towards an assembly for transversely cutting the web into subsequent web lengths, spreading the layers of each web length apart for the introduction of the articles thereinto, and then transversely heat-sealing the web length; and   the supply device comprising a pair of parallel rollers for guiding the web arranged transversally on opposite sides of the web and whose angular position with respect to the advancement direction of the web is adjustable.   
     
     
         2 . The machine according to  claim 1 , wherein one end of said pair of guide rollers is pivoted to an orienting axis perpendicular to the plane of the web and the opposite end thereof is connected to an angular displacement device of the pair of guide rollers around said orienting axis. 
     
     
         3 . The machine according to  claim 2 , wherein said angular displacement device is of the screw-and-nut linear type. 
     
     
         4 . The machine according to  claim 2 , wherein said guide rollers are mutually superimposed vertically so as to deviate the web from a horizontal path to a vertical path, and said orienting axis is vertical. 
     
     
         5 . The machine according to  claim 4 , wherein a lower roller of said pair of guide rollers is provided with a superficial helical race. 
     
     
         6 . The machine according to  claim 4 , wherein said lower roller of said pair of guide rollers is provided with at least one annular radial groove. 
     
     
         7 . The machine according to  claim 5 , wherein said lower roller of said pair of guide rollers is provided with at least one annular radial groove. 
     
     
         8 . The machine according to  claim 7 , wherein said lower roller of said pair of guide rollers is provided with a plurality of longitudinally spaced-apart annular radial grooves. 
     
     
         9 . The machine according to  claim 4 , wherein an upper roller of said pair of guide rollers is provided with an at least partly elastically yieldable surface. 
     
     
         10 . The machine according to  claim 9 , wherein said upper roller of said pair of guide rollers is entirely covered by a soft material. 
     
     
         11 . The machine according to  claim 9 , wherein said upper roller of said pair of guide rollers is covered by a soft material along a helical path. 
     
     
         12 . The machine according to  claim 5 , wherein said upper roller of said pair of guide rollers is provided with a superficial helical race. 
     
     
         13 . The machine according to  claim 6 , wherein said upper roller of said pair of guide rollers is provided with a superficial helical race. 
     
     
         14 . The machine according to  claim 6 , wherein said upper roller of said pair of guide rollers is provided with at least one annular radial groove facing said at least one annular radial groove of the lower roller. 
     
     
         15 . The machine according to  claim 8 , wherein said upper roller of said pair of guide rollers is provided with a plurality of annular radial grooves facing said annular radial grooves of the lower roller. 
     
     
         16 . The machine according to  claim 1 , wherein said guide rollers are idle rollers. 
     
     
         17 . The machine according to  claim 1 , wherein a pair of respectively drawing and abutment rollers is provided downstream of said pair of guide rollers with respect to the advancement direction of the web, at least one of which has a superficial helical race. 
     
     
         18 . Machine according to  claim 17 , wherein, at least one of said drawing and abutment rollers has at least one annular radial groove. 
     
     
         18 . A machine for packaging articles into bags made of heat-sealable flexible material starting from a reel of a continuous web having two superimposed flat layers mutually permanently joined along one side, wherein the machine comprises:
 a supply device for supplying the web along an advancement direction towards an assembly for transversely cutting the web into subsequent web lengths, spreading the layers of each web length apart for the introduction of the articles thereinto, and then transversely heat-sealing the web length,   the supply device comprising a pair of vertically superimposed parallel rollers for guiding the web, said rollers being arranged transversally on opposite sides of the web and an upper roller of said pair of rollers pressing the web against a lower roller of said pair of rollers, and   wherein an angular position of said rollers with respect to said advancement direction of the web is adjustable.   
     
     
         19 . The machine according to  claim 18 , wherein said lower roller is provided with a superficial helical race and with at least one annular radial groove.