Turbofan comprising a set of rotatable blades for blocking off the bypass flow duct

A turbofan having a longitudinal axis and comprising a motor and a nacelle, surrounding the motor, which comprises a fan casing, in which a duct for a bypass flow is delimited between the nacelle and the motor and in which a flow of air flows in a flow direction, said nacelle comprising:

• a fixed structure fixed to the fan casing,
• a mobile assembly having a mobile cowl and a slider, the mobile cowl being fixed to the slider, the slider being mobile in translation, on the fixed structure, in a direction of translation between an advanced position in which the slider is positioned such that the mobile cowl is moved close to the fan casing and an extended position in which the slider is positioned such that the mobile cowl is moved away from the fan casing to define, between them, an open window between the duct and an exterior of the nacelle,
• a plurality of blades, each blade comprising a first end mounted mobile in rotation on the slider about an axis of rotation and where the plurality of blades are gradually offset angularly about the longitudinal axis, where each blade is mobile between a stowed position in which the blade is outside the duct and a deployed position in which the blade is across the duct,
• an assembly of actuators causing the slider to move between the advanced position and the extended position, and vice versa, and
• a maneuvering system configured to move each blade from the stowed position to the deployed position and vice versa, where the maneuvering system comprises:
• for each blade, a shaft mounted mobile in rotation on the slider about an axis of rotation, and onto which the blade is fixed,
• for each shaft, an arm which has a first end fixed to the shaft and a second end,
• an arc coaxial with the longitudinal axis, mounted rotatably mobile on the slider about the longitudinal axis,
• for each arm, a base of a rectilinear rod is fixed to the arc,
• for each rectilinear rod, a stock having a first end, a second end, and a through-bore into which the rectilinear rod is inserted, in which the stock is mounted free in translation relative to the rectilinear rod, and in which the second end of the stock is mounted free in rotation on the arm about a rocking axis parallel to the axis of rotation, and
• an actuation system which produces rotation of the arc in one direction and in an opposite direction.