Clockwork clutch mechanism, comprising - a shaft, - a first wheel arranged to be freely rotatably mounted on the shaft and to rotate continuously around the shaft, - a clutch disc integral with the shaft - a control device, in which the mechanism is arranged to move, under the action of the control device, from an engaged position to a disengaged position and vice versa, in which the clutch disc belongs to a plane perpendicular to the shaft and in this plane it comprises - a central hub cooperating with the shaft, characterised in that the clockwork clutch mechanism comprises - a second wheel integral with the shaft, and in that the clutch disc comprises, in the plane perpendicular to the shaft: - at least two peripheral rigid clutch elements, and - at least one flexible blade connecting each peripheral rigid clutch element to the central hub, and in which the flexible blades are arranged to deform in said plane, so that - in the engaged position, the clutch disc has a first diameter, so that the peripheral rigid clutch elements come into contact with a surface of the first wheel, the first wheel driving the clutch disc as a result of this contact, the clutch disc therefore driving the shaft, and the shaft driving the second wheel, - in the disengaged position, the clutch disc has a second diameter smaller than the first diameter, so that the peripheral rigid clutch elements no longer come into contact with the surface of the first wheel. - a shaft, - a first wheel arranged to be freely rotatably mounted on the shaft and to rotate continuously around the shaft, - a clutch disc integral with the shaft - a control device, in which the mechanism is arranged to move, under the action of the control device, from an engaged position to a disengaged position and vice versa, in which the clutch disc belongs to a plane perpendicular to the shaft and in this plane it comprises - a central hub cooperating with the shaft, characterised in that the clockwork clutch mechanism comprises in which the mechanism is arranged to move, under the action of the control device, from an engaged position to a disengaged position and vice versa, in which the clutch disc belongs to a plane perpendicular to the shaft and in this plane it comprises - a central hub cooperating with the shaft, - a central hub cooperating with the shaft, characterised in that the clockwork clutch mechanism comprises - a second wheel integral with the shaft, and in that the clutch disc comprises, in the plane perpendicular to the shaft: - at least two peripheral rigid clutch elements, and - at least one flexible blade connecting each peripheral rigid clutch element to the central hub, and in which the flexible blades are arranged to deform in said plane, so that - in the engaged position, the clutch disc has a first diameter, so that the peripheral rigid clutch elements come into contact with a surface of the first wheel, the first wheel driving the clutch disc as a result of this contact, the clutch disc therefore driving the shaft, and the shaft driving the second wheel, - in the disengaged position, the clutch disc has a second diameter smaller than the first diameter, so that the peripheral rigid clutch elements no longer come into contact with the surface of the first wheel. and in that the clutch disc comprises, in the plane perpendicular to the shaft: - at least two peripheral rigid clutch elements, and - at least one flexible blade connecting each peripheral rigid clutch element to the central hub, - at least two peripheral rigid clutch elements, and - at least one flexible blade connecting each peripheral rigid clutch element to the central hub, and in which the flexible blades are arranged to deform in said plane, so that - in the engaged position, the clutch disc has a first diameter, so that the peripheral rigid clutch elements come into contact with a surface of the first wheel, the first wheel driving the clutch disc as a result of this contact, the clutch disc therefore driving the shaft, and the shaft driving the second wheel, - in the disengaged position, the clutch disc has a second diameter smaller than the first diameter, so that the peripheral rigid clutch elements no longer come into contact with the surface of the first wheel. - in the engaged position, the clutch disc has a first diameter, so that the peripheral rigid clutch elements come into contact with a surface of the first wheel, the first wheel driving the clutch disc as a result of this contact, the clutch disc therefore driving the shaft, and the shaft driving the second wheel, - in the disengaged position, the clutch disc has a second diameter smaller than the first diameter, so that the peripheral rigid clutch elements no longer come into contact with the surface of the first wheel.