Actuation unit of the articulated lever or cam type provided with a braking unit

An actuation unit of the articulated lever or cam type comprising:

• an actuating arm pivotable between an open position and an operative closed position;
• a pneumatic cylinder comprising a stem movable linearly along a cylinder axis and operatively connected to the actuating arm to control the movement of the actuating arm between the open position and the operative closed position;
• a closing device functionally interposed between the pneumatic cylinder and the actuating arm and configured to bring the actuating arm into rotation following a translational movement imparted by the pneumatic cylinder;
• and
• a braking unit configured to brake and/or stop the movement of the actuating arm, the braking unit comprising
• (a) a threaded shaft comprising
• a first end operatively coupled to the stem of the pneumatic cylinder in such a way that a translation of the stem determines a rotation of the threaded shaft, and
• a second end provided with a head portion comprising at least one surface portion;
• and
• (b) a braking assembly locked against rotation and axially movable relative to the head portion of the threaded shaft between a first non-braking configuration in which the braking assembly is not in contact with the at least one surface portion of the head portion and a second braking configuration in which the braking assembly is in contact with the at least one surface portion;
• wherein the at least one surface portion is in a non-orthogonal arrangement with respect to the cylinder axis, and the braking assembly comprises a plurality of rollers and a support structure for the rollers configured to retain each roller of the plurality of rollers allowing a clearance with respect to a radial movement of the rollers, the rollers being able to assume a first radial configuration not in contact with the at least one surface portion and a second radial configuration in contact with the at least one surface portion.