Patent ID: 7617654
Filing Date: 2009-11-17
Classification: B67B

Abstract:
1. A screwing/rolling head for screwing and sealing a pre-threaded cap onto a threaded neck of a container, said head comprising: a body extended along a specified longitudinal axis and connectable to a capping machine so that said body can be rotated about said axis and can be moved axially between a first retracted position and a second advanced operating position; a cap pressing member capable of engaging a cap to screw the cap onto a threaded neck of a container, said cap pressing member extending along said longitudinal axis to form an extension of said body; and connecting means associating said cap pressing member for operation with said body such that said cap pressing member is movable relative to said body between a first position defining a contracted configuration and a second position defining an extended configuration, said connecting means limiting said relative movement to a rotary-translational movement having only one degree of freedom so as to ease the screwing of the cap onto the container during the movement of said cap pressing member from said extended configuration to said contracted configuration, said connecting means comprising a positive coupling between a guide, provided either in said body or in said cap pressing member, that directs the rotary-translational movement and a pin that, during the movement of said member from said extended configuration to said contracted configuration, is fixed to the other of said body and said cap pressing member, and said connecting means further comprising toothing with asymmetrical teeth having a profile that enables said pin to abut against said teeth during the movement of said cap pressing member from said extended configuration to said contracted configuration and that allows said pin to override said teeth when a predetermined torque is exceeded during movement in the opposite direction.