Patent ID: 7334380

Claim:
A device for screwing caps onto receptacles, the device comprising a rotary spindle having a first end provided with a cap gripper head and a second end connected to a two-portion clutch member, one of which portions is constrained to rotate with the second end of the rotary spindle, and the other of which portions is constrained to rotate with a drive shaft on the same axis as the spindle and associated with a drive member, wherein the portions of the clutch member comprise a magnetic bell and a magnetic core having dimensions suitable for enabling it to be engaged in the bell, the device further comprising a displacement member for displacing the bell and the core relative to each other between a position in which the core is engaged in the bell and a position in which the core is disengaged from the bell, wherein the core is mounted to slide on the second end of the spindle, and wherein the spindle is mounted on a rotary platform secured to a structure having a cam secured thereto that co-operates with a wheel mourned on a slider of the core so as to form the displacement member.