Rotary device for welding a continuous web

Patent metadata

Field	Value
Publication number	US-11396137-B2
Application number	US-202016950219-A
Country	US
Kind code	B2
Filing date	Nov 17, 2020
Priority date	Dec 19, 2019
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

A rotary device for welding a continuous web includes a rotary element, support elements for supporting the web, supported by the rotary element, and a plurality of welding units for welding the web. Each welding unit passes from a non-operating position to an operating position and vice versa, and includes a first movement device for commanding a relative rotation of an anvil element relative to a welding tip and a second movement device for moving the anvil element relative to the welding tip such that a contact surface of the anvil element and a contact surface of the welding tip make contact with a portion of the web in a zone between them, and vice versa. First and second drive mechanisms drive the first and second movement devices. The first and second drive mechanisms are configured to vary a positioning of the welding tip relative to the axis.

First claim

What is claimed is:

1. A rotary device for sealing a continuous web, comprising:
a rotary carousel rotatable about an axis of rotation thereof, a supporting element including a retaining surface, for supporting a continuous web supported by the rotary carousel and a plurality of welding units for welding the continuous web supported by the rotary carousel;
each welding unit being configured to pass from a non-operating position to an operating position and vice versa;
each welding unit comprising a respective welding tip and a respective anvil connected to a movable lever such that the anvil is movable relative to the welding tip;
each welding unit comprising a respective first movement mechanism including a first articulated mechanism connected to the lever and configured to drive the anvil in rotation relative to the welding tip from an initial position, where the anvil is angularly spaced from the welding tip, to a final position, and vice versa;
at the final position, a surface of the welding tip and a surface of the anvil being parallel to each other and the axis at right angles to the surface of the welding tip and the axis at right angles to the surface of the anvil are aligned along a same axis of alignment;
each welding unit comprising a second movement mechanism including a second articulated mechanism connected to the lever and configured for moving the anvil relative to the welding tip from a starting position, where the surface of the welding tip and the surface of the anvil are parallel and aligned with each other along the same axis of alignment, to an arrival position, where a contact surface of the anvil and a contact surface of the welding tip contact a respective portion of the continuous web in a respective zone interposed between them, and vice versa;
a first drive mechanism configured to drive the first movement mechanism to cause the anvil to pass from the initial position to the final position and vice versa;
a second drive mechanism configured to drive the second movement mechanism to cause passage from the starting position to the arrival position, and vice versa;
the first drive mechanism and the second drive mechanism being configured to vary a relative positioning of the welding tip relative to the axis of rotation of the rotary carousel.

2. The device according to independent claim 1 , wherein for each welding unit the first drive mechanism comprises a first rod-shaped member and a first motion transmission member configured for transmitting motion to the first movement mechanism; the first motion transmission member being shaped to slidably engage the first rod-shaped member to translate along the first rod-shaped member and vary a relative position of the first motion transmission member along the first rod-shaped member.

3. The device according to claim 2 , wherein for each welding unit the first rod-shaped member of the first drive mechanism is configured to be rotated; the rotation of the first rod-shaped member causing actuation of the first movement mechanism via the first motion transmission member.

4. The device according to claim 3 , wherein for each welding unit the second drive mechanism comprises a second rod-shaped member and a second motion transmission member configured for transmitting motion to the second movement mechanism; the second motion transmission member being slidably constrained to the second rod-shaped member to translate along the second rod-shaped member and vary ails relative position of the second motion transmission member along the second rod-shaped member.

5. The device according to claim 4 , wherein for each welding unit the second rod-shaped member of the second drive mechanism is configured to be rotated; the rotation of the second rod-shaped member causing actuation of the second movement mechanism via the second motion transmission member.

6. The device according to claim 5 , and further comprising a cam configured to drive the rotation of the first and second rod-shaped members.

7. The device according to claim 1 , wherein for each welding unit the first articulated mechanism comprises a crank, moved by the first drive mechanism, with the lever moved by the crank in such a way as to oscillate with respect to a relative axis of oscillation for controlling angular movement of the anvil relative to the welding tip from the initial position to the final position, and vice versa.

8. The device according to claim 7 , wherein for each welding unit the first articulated mechanism further includes a first connecting rod, connected to the crank, and a second connecting rod connected to the first connecting rod and to the lever; the first connecting rod and the second connecting rod configured to transmit the movement from the crank to the lever.

9. The device according to claim 8 , wherein for each welding unit the second articulated mechanism comprises a crank, moved by the second drive mechanism, and a connecting rod rotatably connected to an axis of oscillation of the lever.

10. The device according to claim 9 , wherein for each welding unit the second movement mechanism comprises a pneumatic system configured for determining a translation of the anvil towards or away from the welding tip, by the second articulated mechanism.

11. The device according to claim 1 , wherein for each welding unit the the second articulated mechanism comprises a crank, moved by the second drive mechanism, and a connecting rod rotatably connected to an axis of oscillation of the lever.

12. The device according to claim 11 , wherein for each welding unit the second movement mechanism comprises a pneumatic system configured for determining a translation of the anvil towards or away from the welding tip, by the second articulated mechanism.

13. The device according to claim 1 , wherein for each welding unit the second drive mechanism comprises a second rod-shaped member and a second motion transmission member configured for transmitting motion to the second movement mechanism; the second motion transmission member being slidably constrained to the second rod-shaped member to translate along the second rod-shaped member and vary a relative position of the second motion transmission member along the second rod-shaped member.

14. The device according to claim 13 wherein for each welding unit the second rod-shaped member of the second drive mechanism is configured to be rotated; the rotation of the second rod-shaped member causing actuation of the second movement mechanism via the second motion transmission member.

Assignees

• Gdm Spa

Inventors

• Piantoni Matteo
• Resmini Gabriele
• Spatti Maurizio
• Fusar Poli Aldo
• Duchini Andrea
• Campagnoli Enrico
• Borderi Luca
• Biondi Andrea
• Parisini Gianluca

Classifications

• B29C66/80

  General aspects of machine operations or constructions and parts thereof · CPC title

• B29C66/1122

  Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence) · CPC title

• B29L2031/4878

  Diapers, napkins · CPC title

• B29C66/8511

  Bag making machines · CPC title

• A61F13/15764

  Transferring, feeding or handling devices; Drives · CPC title