Sealing machine and related control method

A controlling method of a sealing machine, the sealing machine including a plurality of support plates rotatable on themselves each for supporting a container with a cap, and a plurality of sealing heads to keep pressed a seal on the container and fixing the seal to the container, the method comprising the steps of:

• placing containers capped and provided with the seal on the plurality of support plates;
• rotating the plurality of support plates via electric motors associated with the support plates;
• raising the plurality of support plates in translation via the electric motors to raise the containers capped and provided with the seal to the plurality of sealing heads;
• keeping pressed the seal to the cap of a container of the containers and fixing the seal to the container by means of a sealing head of the plurality of sealing heads;
• wherein the step of rotating the plurality of support plates is carried out rotating each support plate independently from the others of the plurality of support plates;
• detecting at least one operating parameter associated with the rotation of each support plate and/or with a compression load between each sealing head of the plurality of sealing heads and the corresponding seal;
• comparing a value of the at least one operating parameter detected with a reference value or a range of reference values;
• sending a signal if the value of the at least one detected operating parameter is different from the reference value or from the range of reference values;
• and
• following the step of sending the signal, commanding a phase of adjusting the rotation of each support plate to include a first rotating speed prior to the fixing of the seal by the sealing head as the sealing head is moved to its operating position, and a second rotating speed greater than the first rotating speed upon commencing of the fixing the seal to the container;
• wherein:
• the at least one detected operating parameter is the compression load between each sealing head and the corresponding seal;
• the step of rotating the support plates takes place by means of each electric motor which is independent from the other electric motors;
• and
• the step of detecting the compression load is performed by detecting a current absorbed by each electric motor;
• and
• based on the comparing, adjusting the compression load with damping means associated with each support plate.