Packaging machine

Abstract

A sealing and cutting assembly that includes a first rotating assembly with a first axis of rotation and a first actuation tool rotating with respect to the first axis of rotation, and a second rotating assembly with a second axis of rotation and a second actuation tool rotating with respect to the second axis of rotation. The sealing and cutting assembly also includes a transmission system that includes first and second gearwheels associated with the second actuation tool, and an adjustment actuator for causing a relative rotation between the first and second gearwheels.

1 . A sealing and cutting assembly of a packaging machine, the sealing and cutting assembly comprising:
 a first rotating assembly with a first axis of rotation, a first actuation tool and an actuator configured to cause the first actuation tool to rotate relative to the first axis of rotation:   a second rotating assembly with a second axis of rotation and a second actuation tool;   a transmission system configured to impart rotation to the second actuation tool to cause the second actuation tool to rotate relative to the second axis of rotation, the transmission system comprising a first transmission assembly with a driving gearwheel attached to the first rotating assembly, and a second transmission assembly associated with the second rotating assembly and configured to cooperate with the driving gearwheel, the second transmission assembly including a first gearwheel that rotates relative to the second axis of rotation and that is connected to the second rotating assembly, and a second gearwheel adjacent to and concentric with the first gearwheel, each of the first and second gearwheels meshing with the driving gearwheel, an angular position between the first and second gearwheels being adjustable; and   a first adjustment actuator configured to act on at least one of the first and second gearwheels to cause a relative rotation between the first and second gearwheels with respect to the second axis of rotation.   
     
     
         2 . The sealing and cutting assembly according to  claim 1 , wherein the first adjustment actuator comprises a piston and a cylinder with a housing, the housing being attached to one of the first and second gearwheels, the piston rod being attached to the other of the first and second gearwheels, the housing and the piston rod being movable relative to each other. 
     
     
         3 . The sealing and cutting assembly according to  claim 1 , comprising a second adjustment actuator configured to act on at least one of the first and second gearwheels to cause a relative rotation between the first and second gearwheels with respect to the second axis of rotation. 
     
     
         4 . The sealing and cutting assembly according to  claim 2 , wherein the first adjustment actuator is configured to be actuated by a fluid and is in fluid communication with a fluid source. 
     
     
         5 . The sealing and cutting assembly according to  claim 4 , wherein the fluid is pressurized air. 
     
     
         6 . The sealing and cutting assembly according to  claim 2 , wherein each of the first and second adjustment actuators is configured to be actuated by a fluid from a same fluid source. 
     
     
         7 . The sealing and cutting assembly according to  claim 4 , further comprising a control unit that is configured to control a delivery of the fluid to the first adjustment actuator. 
     
     
         8 . The sealing and cutting assembly according to  claim 4 , wherein the second actuation tool comprises a longitudinal bore in fluid communication with the fluid source and a radial bore in fluid communication with the longitudinal bore and the first adjustment actuator. 
     
     
         9 . The sealing and cutting assembly according to  claim 8 , wherein the longitudinal bore extends from a side of the second actuation tool closest to the first and second gearwheels. 
     
     
         10 . The sealing and cutting assembly according to  claim 4 , wherein the second actuation tool comprises a sealing tool and a cutting tool, the sealing tool having first and second sealing surfaces, the cutting tool being arranged between the first and second sealing surfaces and configured to move relative to the sealing tool between an active position in which the cutting tool protrudes from the first and second sealing surfaces and an inactive position in which the cutting tool is retracted relative to the first and second sealing surfaces. 
     
     
         11 . The sealing and cutting tool according to  claim 10 , further comprising a first actuation drive configured to act on the cutting tool to cause the cutting tool to move from the inactive position to the active position or from the active position to the inactive position. 
     
     
         12 . The sealing and cutting assembly according to  claim 11 , wherein the first actuation drive is driven by a fluid, the first adjustment actuator and the first actuation drive being connected to the fluid source. 
     
     
         13 . The sealing and cutting tool according to  claim 10 , further comprising first and second actuation drives configured to act simultaneously on the cutting tool to cause the cutting tool to move from the inactive position to the active position, the first actuation drive being arranged at one side of the cutting tool relative to the second axis of rotation of the second rotating assembly and the second actuation drive being arranged at the other side of the cutting tool relative to the second axis of rotation. 
     
     
         14 . The sealing and cutting assembly according to  claim 11 , wherein the second actuation tool comprises a longitudinal bore in fluid communication with the fluid source and the first actuation drive. 
     
     
         15 . The sealing and cutting assembly according to  claim 14 , wherein the longitudinal bore extends along the second axis of rotation from a side of the second actuation tool furthest from the first and second gearwheels. 
     
     
         16 . The sealing and cutting assembly according to  claim 12 , further comprising a control unit configured to cause the supply of the fluid that actuates the first actuation drive when the second actuation tool is in an angular position in which it cooperates with the first actuation tool to seal and cut a film arranged between the first and second actuation tools. 
     
     
         17 . The sealing and cutting assembly according to  claim 4 , further comprising a pressure actuator on each side of the second actuation tool, the pressure actuator being configured to press on the second rotating assembly in a downward direction towards the driving gearwheel. 
     
     
         18 . The sealing and cutting assembly according to  claim 17 , wherein the pressure actuator is fluid driven, each of the pressure actuator and the first adjustment actuator being connected to the fluid source. 
     
     
         19 . The sealing and cutting assembly according to  claim 18 , further comprising a control unit that is configured to simultaneously control the supply of the fluid to the pressure actuator and the first adjustment actuator.