Patent ID: 7533590
Filing Date: 2009-05-19
Classification: B67B,Y10T

Abstract:
1. A screwing and rolling head for the application of pre-threaded caps on containers, comprising: a first support, designed to be moved with a helical motion made up of a rectilinear movement along a longitudinal axis and a movement of rotation about said axis; a second support, which is mobile with respect to the first support in the direction of said longitudinal axis and is fixed in rotation with respect to the first support; a device for screwing caps, fixed in an axial direction with respect to the second support and rotatable with respect to the second support; a torque-limiter device, connected between the screwing device and the second support, in which the torque-limiter device renders the screwing device fixed in rotation with respect to the second support ( at least one oscillating arm, which carries a rolling element and is articulated to the second support about a transverse axis, said oscillating arm being displaceable between an operative position and an inoperative position and co-operating with a cam actuation member carried by the first support; and first elastic means for applying, between the first support and the second support, a relatively low axial force during a step of screwing of the caps, and second elastic means for applying a relatively high axial force between the first support and the second support during a rolling step, the device for screwing caps comprises a gripper, which is mobile between an open position and a closed position and is designed to grip a cap along a side wall thereof, the movements of opening and closing of the gripper being controlled by a control rod, which is mobile in an axial direction.