Patent ID: 6972502

Claim:
An improved device for transmitting motion between the rotor of a synchronous permanent-magnet motor and a working part associated to said rotor, comprising: a first coupling, provided with a driving element, which is eccentric with respect to the rotation axis of the rotor at a rotor shaft end, and a driven element which is eccentric with respect to the rotation axis of the rotor; and a second coupling, which cooperates in a kinematic series with said first coupling and is provided with a driving element and a driven element, that is eccentric with respect to the rotation axis of the rotor and rigid with said working part, said driving element of the first coupling and said driven element of the second coupling lying in distinct and non-interfering axial positions, wherein said driven element of the first coupling and said driving element of the second coupling comprise a single elastic member having two elastic elements which are angularly separated from each other with a gap provided therebetween, one of them interfering with the driving element of the first coupling and the other one interfering with the driven element of the second coupling.