Patent ID: 7097434

Claim:
A device for transmitting motion between the rotor of a synchronous permanent-magnet motor and a working part, comprising: at least two motion transmission couplings which mutually cooperate in a kinematic series, the couplings being arranged with respect to a shaft defining a rotation axis, each said coupling being constituted by at least one driving element which is eccentric with respect to the rotation axis and which is rigidly coupled to a motion transmission component, and by at least one driven element, which is also eccentric with respect to the rotation axis and which is rigidly coupled to a motion transmission component arranged kinematically after the preceding component coupled to the at least one driving element, the angle covered by the driving and driven elements of each coupling being, as a whole, less than 360°, wherein at least one intermediate motion transmission component of the kinematic transmission comprises both a driven element and a driving element for receiving the motion from a preceding motion transmission component and transmitting it to a subsequent motion transmission component, a resulting free angle of rotation being given by a sum of the angles of each coupling, wherein a first one of said couplings is constituted by a first tooth which is rigidly coupled to the rotor of the motor and by a second tooth which is rigidly coupled to an annular element which can rotate freely with respect to said rotor, and wherein a second one of said couplings is composed of said second tooth and a third tooth which is rigidly coupled to the working part, said second tooth forming said at least one intermediate component.