Nacelle (102, 402) for a turbofan, said nacelle (102, 402) comprising: - a fixed cowl and a mobile cowl mobile in translation in a translation direction between a closing position in which it is close to the fixed cowl and an opening position in which it is far aft of the fixed cowl, - an actuator intended for moving the mobile cowl from the closing position to the opening position, and vice versa, - a window delimited on the upstream side by the fixed cowl and on the downstream side by the mobile cowl, said window being open between a duct for a bypass flow and the exterior of the nacelle (102, 402), - a reverser flap mounted mobile in rotation about a rotation axis between a closed position in which it obstructs the window and an open position in which it does not obstruct the window, and - a drive mechanism designed to coordinate the passage from the closed position to the open position of the reverser flap with the passage from the closing position to the opening position of the mobile cowl and vice versa, said drive mechanism comprising: - two bearings, each being mounted fixedly on a structure of the nacelle (102, 402), - for each bearing, a lever arm of which a first end is mounted mobile in rotation on the bearing and of which a second end is mounted fixedly on the reverser flap, - for each lever arm, a rail integral with the mobile cowl, each rail comprising a straight portion of which the axis is parallel to the direction of translation of the mobile cowl, and a curved portion that extends the straight portion towards the front, - for each lever arm, a rod of which a first end is mounted in an articulated manner on the lever arm, and - for each rail, a slider that is mounted so as to be mobile in translation on the rail and is mounted so as to be articulated to a second end of the rod. - a fixed cowl and a mobile cowl mobile in translation in a translation direction between a closing position in which it is close to the fixed cowl and an opening position in which it is far aft of the fixed cowl, - an actuator intended for moving the mobile cowl from the closing position to the opening position, and vice versa, - a window delimited on the upstream side by the fixed cowl and on the downstream side by the mobile cowl, said window being open between a duct for a bypass flow and the exterior of the nacelle (102, 402), - a reverser flap mounted mobile in rotation about a rotation axis between a closed position in which it obstructs the window and an open position in which it does not obstruct the window, and - a drive mechanism designed to coordinate the passage from the closed position to the open position of the reverser flap with the passage from the closing position to the opening position of the mobile cowl and vice versa, said drive mechanism comprising: - two bearings, each being mounted fixedly on a structure of the nacelle (102, 402), - for each bearing, a lever arm of which a first end is mounted mobile in rotation on the bearing and of which a second end is mounted fixedly on the reverser flap, - for each lever arm, a rail integral with the mobile cowl, each rail comprising a straight portion of which the axis is parallel to the direction of translation of the mobile cowl, and a curved portion that extends the straight portion towards the front, - for each lever arm, a rod of which a first end is mounted in an articulated manner on the lever arm, and - for each rail, a slider that is mounted so as to be mobile in translation on the rail and is mounted so as to be articulated to a second end of the rod.