Machine for closing the tail end of a roll of web material
The machine includes a first glue-applying device for closing the tail end; and a second mechanical-closing device for mechanically anchoring the tail end of the roll to a portion of an outer turn of the web material wound on the roll.
1. A machine for closing a tail end of a roll of web material comprising: a first glue-applying device for closing said tail end; and a second mechanical-closing device for mechanically sealing the tail end by anchoring the tail end of the roll to a portion of an outer turn of web material wound on the roll; wherein said first glue-applying device and said second mechanical-closing device are alternately operable to each other to separately seal said tail end to said roll.
2. The machine according to claim 1 , wherein said second device comprises a plurality of mechanical ply-bonding members.
3. The machine according to claim 1 , wherein said second device comprises a plurality of mechanical ply-bonding members.
4. The machine according to claim 2 , wherein said mechanical ply-bonding members are arranged aligned with one another and with the tail end of the roll of web material.
5. The machine according to claim 3 , wherein said mechanical ply-bonding members are arranged aligned with one another and with the tail end of the roll of web material.
6. The machine according to claim 2 , wherein each of said plurality of mechanical ply-bonding members can move between an operating position and an idle position.
7. The machine according to claim 2 , wherein each of said plurality of mechanical ply-bonding members comprises a mechanical ply-bonding roller.
8. The machine according to claim 1 , wherein said first glue-applying device comprises a plurality of glue dispensing nozzles arranged and controlled so as to apply glue on the tail end of the roll.
9. The machine according to claim 8 , wherein said glue dispensing nozzles are aligned with the tail end of the roll.
10. The machine according to claim 8 , wherein said second mechanical-closing device comprises a plurality of mechanical ply-bonding members, and wherein a respective one of said plurality of mechanical ply-bonding members is associated with a respective one of said glue dispensing nozzles.
11. The machine according to claim 8 , wherein each of said glue dispensing nozzles is carried by a slide.
12. The machine according to claim 8 , wherein said glue dispensing nozzles have an adjustable inclination to apply glue alternatively on the tail end or on the cylindrical surface of the roll.
13. The machine according to claim 8 , wherein at least one sensor is associated with each of said glue dispensing nozzles to detect presence of the tail end of the roll.
14. The machine according to claim 8 , wherein two sensors are associated with each of said glue dispensing nozzles for detecting presence of the tail end of the roll, said two sensors being arranged at sides of the nozzle, and aligned with the tail end to be glued.
15. The machine according to claim 13 , wherein each one of said glue dispensing nozzles is inhibited by a signal of a respective sensor when said sensor does not detect presence of the tail end to be closed.
16. The machine according to claim 8 , wherein said nozzles are inhibited when said mechanical ply-bonding members are actuated, and vice versa.
17. A machine for closing a tail end of a roll of web material comprising: a first glue-applying device for closing said tail end; and a second mechanical-closing device for mechanically sealing the tail end by anchoring the tail end of the roll to a portion of an outer turn of web material wound on the roll,
wherein said second device comprises a plurality of mechanical ply-bonding members,
wherein each of said plurality of mechanical ply-bonding members comprises a mechanical ply-bonding roller, and
wherein each said mechanical ply-bonding roller is carried by a respective slide which is provided with a synchronous movement parallel to the tail end to be closed.
18. The machine according to claim 17 , wherein each said respective slide is mechanically connected with one another to move synchronously.
19. The machine according to claim 17 , wherein each said respective slide carries an actuator respectively for pushing a respective one of said mechanical ply-bonding roller against a pressure and rolling surface, and carrying the mechanical ply-bonding roller in an idle position.
20. A machine for closing a tail end of a roll of web material comprising: a first glue-applying device for closing said tail end; and a second mechanical-closing device for mechanically sealing the tail end by anchoring the tail end of the roll to a portion of an outer turn of web material wound on the roll,
wherein said second device comprises a plurality of mechanical ply-bonding members,
wherein each of said plurality of mechanical ply-bonding members comprises a mechanical ply-bonding roller, and
wherein each said mechanical ply-bonding roller comprises a first knurled annular portion, cooperating with said pressure and rolling surface; a second elastically yielding annular portion, cooperating with an embossing surface provided with an engraving, the web material pressed between the embossing surface and the second elastically yielding annular portion of each said mechanical ply-bonding roller being embossed with a pattern defined by said engraving.