Packaging machine

1. A packaging machine to make an airtight wrapper comprising a wrapping sheet wrapped airtight around a structured assembly consisting of an organized group of smoking articles associated with a reinforcement insert, the machine comprising:

a structured assembly formation unit comprising a formation pocket configured as a chamber with a lower wall, an upper wall and lateral walls, and which is configured to house the structured assembly said chamber having a first introduction mouth and a second introduction mouth disposed opposite one another, the chamber configured to allow the structured assembly to pass through;

a combination unit configured to combine the structured assembly with said wrapping sheet, with or without a reusable closing label, in order to obtain an intermediate combination of the wrapping sheet and the structured assembly;

a first welding station, in which a first folding of the wrapping sheet is made along a longitudinal axis around the structured assembly, said first welding station being configured to weld respective upper and lower edges of the wrapping sheet thereby defining a welded transverse edge to obtain a manipulable whole;

a wrapping unit comprising a gripping member configured to hold the manipulable whole, and a folding station provided with a folding device with folding members, configured to fold at least longitudinal lateral flaps of the wrapping sheet, in order to obtain a pre-wrapper provided with longitudinal tabs;

a welding unit, having a second welding station provided with welding devices configured to weld the pre-wrapper at least along the longitudinal tabs in order to complete their welding, obtaining a closed and sealed airtight wrapper;

wherein the chamber is provided with spreader members configured to keep lateral walls of the reinforcement insert spreading out with respect to a base wall of the reinforcement insert, when the structured assembly formed by the reinforcement insert and the smoking articles is housed within the chamber of the formation pocket; and

wherein said formation pocket is provided with lateral positioning means configured to keep the spread out lateral walls of the reinforcement insert aiming toward said upper wall of the chamber by an angle of greater than 90° with respect to the base wall.

2. The packaging machine as in claim 1 , wherein said first introduction mouth and said second introduction mouth are coaxial, and wherein said spreader members are provided adjacent said second introduction mouth.

3. The packaging machine as in claim 1 , wherein said lateral positioning means comprise lateral projections located inside said chamber and protruding progressively toward said first introduction mouth.

4. The packaging machine as in claim 1 , including an introduction base in said chamber adjacent to said second mouth and provided with introduction seatings positioned to align with the smoking articles.

5. The packaging machine as in claim 1 , including base positioning means in said chamber, the base positioning means configured to position the base wall of the reinforcement insert such that it does not interfere during the introduction of the smoking articles.

6. The packaging machine as in claim 5 , wherein said base positioning means comprise a lower positioning base disposed at a distance from the lower wall of said chamber to define an interspace sized to receive an end part of said base wall of the reinforcement insert, said lower positioning base being coordinated with introduction seatings of an introduction base in said chamber.

7. The packaging machine as in claim 5 , wherein said base positioning means further comprises at least one of blades or shaped needles, the blades or shaped needles being positioned at said second introduction mouth and positioned in a contact zone between one smoking article and another.

8. The packaging machine as in claim 1 , and wherein there is an upper positioning base in said chamber in correspondence with said first introduction mouth, the upper positioning base provided with positioning seatings arranged to align with the smoking articles.

9. The packaging machine as in claim 1 , and including guide means for an expeller device are provided in said lateral walls of said chamber.

10. The packaging machine as in claim 1 , wherein said upper wall and said lower wall have a reduced thickness adjacent to the first introduction mouth.

11. The packaging machine as in claim 1 , and wherein said combination unit comprises a feed member of a wrapping sheet positioned outside said formation pocket adjacent to said first introduction mouth, and an expeller device configured for expelling the structured assembly from said pocket and combining the structured assembly with the wrapping sheet to obtain the intermediate combination, wherein alignment and guide devices are provided to keep the intermediate combination aligned during the transfer from said pocket to said wrapping unit, wherein the feed member further includes arms to position the wrapping sheet in a desired position in relation to said first introduction mouth, said arms being configured to position said wrapping sheet in a desired manner relative to the structured assembly exiting from said chamber.

12. The packaging machine as in claim 11 , wherein said structured assembly comprises a head wall, a bottom wall, and first and second base walls, wherein said wrapping sheet comprises an upper and a lower flap and a lower wall, and wherein said wrapping sheet is positioned, in relation to said structured assembly, such that the lower wall is associated with said bottom wall, the upper flap extends beyond an edge of the first base wall and in continuity with the first base wall and the lower flap extends beyond the edge of the second base wall and in continuity the second base wall.

13. The packaging machine as in claim 1 , wherein said gripping member of the wrapper unit has an upper plane subjected to elastic members acting toward a fixed base plane, the upper plane and the base plane being equipped to contain and position the intermediate combination.

14. A packaging machine to make an airtight wrapper comprising a wrapping sheet wrapped airtight around a structured assembly consisting of an organized group of smoking articles associated with a reinforcement insert, the machine comprising:

a structured assembly formation unit comprising a formation pocket configured as a containing chamber with a lower wall, an upper wall and lateral walls, and which is configured to house the structured assembly, said containing chamber having a first introduction mouth and a second introduction mouth configured to be crossed through by the structured assembly, and placed opposite each other;

a combination unit configured to combine the structured assembly with said wrapping sheet, with or without a reusable closing label, in order to obtain an intermediate combination of the wrapping sheet and the structured assembly;

a first welding station, in which a first folding of the wrapping sheet is made along a longitudinal axis around the structured assembly, said first welding station being configured to weld respective upper and lower edges of the wrapping sheet, defining a welded transverse edge, to obtain a manipulable whole;

a wrapping unit comprising a gripping member configured to hold the manipulable whole, and a folding station provided with a folding device configured to fold both transverse lateral flaps and longitudinal lateral flaps of the wrapping sheet, in order to obtain a pre-wrapper provided with longitudinal tabs;

a welding unit having a second welding station provided with welding devices configured to weld the pre-wrapper at least along the longitudinal tabs in order to complete welding thereof and obtain a closed and sealed airtight wrapper, wherein the folding device for operating on the manipulable whole comprises:

a pair of front folders, configured to act on opposite front lateral flaps of the wrapping sheet;

a pair of rear folders, configured to act on opposite rear lateral flaps of the wrapping sheet;

a pair of upper folders configured to act on the welded transverse edge;

two pairs of lateral folders configured to act on respective opposite longitudinal lateral flaps defining the longitudinal tabs.

15. The packaging machine as in claim 14 wherein said front folders and/or said rear folders have a triangular shape in a zone that contributes to the folding, and wherein said front folders each comprise a front thruster element that is mobile on a horizontal plane.

16. A method of operating the packaging machine as in claim 1 , including forming said structured assembly inside the chamber of the formation pocket, introducing the reinforcement insert into said chamber through the first introduction mouth, and subsequently introducing the organized group of smoking articles through the second introduction mouth, said method further including expelling the structured assembly through said first introduction mouth.

17. The method of operating the packaging machine as in claim 16 , wherein the intermediate combination is obtained by combining the structured assembly with the wrapping sheet, obtaining the intermediate combination during axial translation of the structured assembly from the formation pocket to the gripping member.

18. The method of operating the packaging machine as in claim 17 , including providing said structured assembly with a head wall, a bottom wall, and first and second base walls, providing said wrapping sheet with an upper and a lower flap and a lower wall, and positioning said wrapping sheet, in relation to said structured assembly, such that the lower wall is associated with said bottom wall, with the upper flap extending beyond an edge of the first base wall and in continuity with the first base wall, and with the lower flap extending beyond the edge of the second base wall and in continuity the second base wall.

19. The method of operating the packaging machine as in claim 18 , wherein during an insertion of the intermediate combination into said gripping member, an expeller device of the combination unit thrusts said intermediate combination.

20. The method of operating the packaging machine as in claim 19 , wherein said expeller device expels the pre-wrapper.

21. The method of operating the packaging machine as in claim 16 , wherein in the folding station the following operations are carried out:

folding the welded transverse edge by means of upper folders, taking the welded transverse edge into contact with a front lateral wall of the manipulable whole;

refolding opposite lateral flaps of the wrapping sheet projecting laterally in a transverse direction from the structured assembly, and making triangular folds by means of front and rear folders;

folding and bringing closer together the opposite longitudinal lateral flaps of the wrapping sheet that protrude transversely above and below the structured assembly, bringing the opposite longitudinal lateral flaps adjacent to said triangular folds on said lateral walls and making respective longitudinal tabs that extend orthogonal to said lateral walls by means of lateral folders.

22. The method for operating the packaging machine as in claim 21 , including driving said front, rear and upper folders at the same time, and then subsequently driving said lateral folders.