Device for forming containers produced continuously from a tubular wrapper and unit for packaging the containers

A unit for packaging containers comprising:

• means for feeding a continuous strip of paper material;
• a forming member to join opposite longitudinal elements of said continuous strip and to form a tubular wrapper;
• and
• a filling member positioned downstream of said forming member to fill the tubular wrapper with an incoherent material;
• a forming device for forming containers produced continuously from the tubular wrapper wherein said forming device comprises:
• a plurality of support carriages movable alone a respective closed path, said closed path having at least one active segment parallel to said direction of advance,
• each support carriage having a sealing base for being actuated on a first lateral face of said tubular wrapper and a contrasting element movable between a first closed position in which the contrasting element is approached to said base and engaged to a second lateral face of the tubular wrapper opposite to the first lateral face, and a second position in which the contrasting element is movable away from said base,
• means for actuating said plurality of support carriages along the path comprising at least one supporting guide to guide the support carriages along said closed path, a first motor member to actuate the support carriages alone the active segment and a second motor member to actuate the support carriages alone a passive segment opposite to said active segment, and
• means for cutting said tubular wrapper operatively active at a sealing region to obtain said containers;
• wherein said means for actuating said support carriages comprise at least one supporting guide to guide the support carriages along said closed path, a first motor member to actuate the support carriages along the active segment and a second motor member to actuate the support carriages along a passive segment opposite to said active segment.