Machine for applying safety strips to the upper part of containers

A machine for applying safety strips to the upper part of containers, comprising means for conveying the containers along an advancement path, said means for conveying having retention heads designed to act upward on the containers, along said advancement path there being in mutual succession at least one transfer station, adapted to transfer to an upper part of the containers a respective safety strip arranged substantially vertically and with a first end thereof, located in a lower region, applied to a first lateral portion of a corresponding container and a second end thereof, located in an upper region, applied to the retention head that acts on the corresponding container, and at least one application station which comprises a fixed structure which supports at least one application assembly which can move, with respect to said fixed structure, substantially parallel to at least one portion of said advancement path of the containers and in a manner which is synchronized with the movement of the containers on said conveyance means, in order to follow a respective container, said at least one application assembly having at least one crimping device which comprises a first pad, designed to contact, with a working face thereof, the first end of the safety strip applied to the corresponding container, and a second pad, which is provided, on a working face thereof, with suction means for a removable retention of the safety strip and is configured to move so as to oscillate with respect to said first pad about a rotation axis which is axially offset with respect to ane axis of said second pad, said second pad being functionally connected to a cam-based actuation device which is shaped to impart in sequence to said second pad, in response to a movement of said application assembly, at least one first oscillation movement about said rotation axis, in order to allow said second pad to remove from the retention head that acts on the corresponding container the second end of the safety strip, retaining it on a working face thereof, by virtue of said suction means, and at least one second oscillation movement, about said rotation axis, in order to allow said second pad to move the second end of the safety strip so that the second adheres to a second lateral portion of the corresponding container, which is arranged on the side opposite to said first lateral portion, further comprising control means which are provided with means for detecting a transfer by said transfer station of the safety strips onto the containers that arrive on the conveyance means and onto the corresponding retention heads and means for varying ashape of said cam-based actuation device which are functionally connected to said control means and can be activated on command by said control means upon detection, by said detection means, of a lack of transfer of the safety strip to at least one corresponding container by said transfer station, in order to inhibit execution of said first oscillation movement by said second pad in the absence of the safety strip on the corresponding container.