Patent ID: RE39481

Claim:
A device for transmitting motion between the a rotor of a synchronous permanent-magnet motor and the a working part, comprising comprising: at least two motion transmission couplings which mutually cooperate in a kinematic series, series; each a first coupling being constituted by of said motion transmission couplings comprising at least one driving element which is eccentric with respect to the rotation axis and is rigidly coupled to a component of the motion transmission system and by the rotor, and at least one driven element , which is also eccentric with respect to the rotation axis and is rigidly coupled to the component arranged kinematically after the preceding one, and can rotate freely with respect to said rotor; a second coupling of said motion transmission couplings comprising at least one driving element which is eccentric with respect to the rotation axis and at least one driven element which is also eccentric with respect to the rotation axis and is rigidly coupled to the working part, wherein the angle covered by the elements of each coupling being is , as a whole, less than a round angle, the intermediate components of the kinematic transmission having both a driven element and a driving element for receiving the motion from a preceding one and transmitting it to a subsequent one, 360 °, wherein said at least one driving element of the second coupling comprises said at least one driven element of said first coupling; wherein said motion transmission couplings are toothed, a first one of said couplings being constituted by two first teeth which are the first coupling comprising at least one driving tooth which is eccentric with respect to the rotation axis and is rigidly coupled to the rotor, of a motor in diametrically opposite positions, and of two second teeth which are rigidly coupled, likewise in diametrically opposite positions, to an annular element which rotor, and at least one driven tooth which is also eccentric with respect to the rotation axis and can rotate freely with respect to said rotor, the working part; a second one of said couplings being composed of said second teeth and of two thirds teeth which are also diametrically opposite and are the second coupling comprising at least one driving tooth, which is eccentric with respect to the rotation axis and can rotate freely with respect to the working part and by at least one driven tooth which is also eccentric with respect to the rotation axis and is rigidly coupled to the working part part, and wherein a radial clearance is provided between the at least one driven tooth of the second coupling and the at least one driving tooth of the first coupling .