a rotary machine for producing recipients made of a thermoplastic material by drawing and blowing performs by a molding device which is provided with an openable mold and a movable drawing rod , a device for supporting and driving the drawing rod , which is embodied in such a way that it is mechanical and includes a power take - off device for generating , on the basis of a monodirectional rotary rotation , two rotary motions of given angular amplitudes of a rocker in two predetermined angular places of a merry - go - round path and a device for converting the two rotary movements of the rocker into two opposite linear alternately descending and ascending displacements of a drive unit connected to the drawing rod .