A kinematic mechanism for controlling a first rotating element and a second rotating element (A, B) having respective axes of rotation (x A, x B) which are parallel to each other and arranged at a fixed distance from each other, the kinematic mechanism comprising a support, a toothed driving element movably mounted on the support and comprising teeth, hereinafter referred to as driving teeth, a first driven toothed element rotatably mounted on the support and adapted to be rigidly connected to the first rotating element, said first driven toothed element comprising a first toothed sector and a second toothed sector which are coaxial with the axis of rotation (x A) of the first rotating element and have a different modulus, wherein the first toothed sector engages with the driving teeth, and a second driven toothed element rotatably mounted on the support and adapted to be rigidly connected to the second rotating element, said second driven toothed element comprising a toothed sector, hereinafter referred to as the third toothed sector, which engages with the second toothed sector of the first driven toothed element, characterized in that the second toothed sector comprises a first toothing portion located axially above the first toothed sector, and a second inclined toothing portion (32") that extends from the first toothing portion and has an end arranged next to the first toothed sector, and in that the third toothed sector comprises a first toothing portion that engages with the first toothing portion of the second toothed sector and is arranged at a different axial height from the first toothed sector, and a second inclined toothing portion (41") that engages with the second toothing portion (32") of the second toothed sector and extends from the first toothing portion of the third toothed sector, said second toothing portion (32") of the second toothed sector having an end arranged at a different axial height from the first toothing portion of the third toothed sector. a support, a toothed driving element movably mounted on the support and comprising teeth, hereinafter referred to as driving teeth, a first driven toothed element rotatably mounted on the support and adapted to be rigidly connected to the first rotating element, said first driven toothed element comprising a first toothed sector and a second toothed sector which are coaxial with the axis of rotation (x A) of the first rotating element and have a different modulus, wherein the first toothed sector engages with the driving teeth, and a second driven toothed element rotatably mounted on the support and adapted to be rigidly connected to the second rotating element, said second driven toothed element comprising a toothed sector, hereinafter referred to as the third toothed sector, which engages with the second toothed sector of the first driven toothed element, characterized in that the second toothed sector comprises a first toothing portion located axially above the first toothed sector, and a second inclined toothing portion (32") that extends from the first toothing portion and has an end arranged next to the first toothed sector, and in that the third toothed sector comprises a first toothing portion that engages with the first toothing portion of the second toothed sector and is arranged at a different axial height from the first toothed sector, and a second inclined toothing portion (41") that engages with the second toothing portion (32") of the second toothed sector and extends from the first toothing portion of the third toothed sector, said second toothing portion (32") of the second toothed sector having an end arranged at a different axial height from the first toothing portion of the third toothed sector.