Blowing or stretch-blowing machine for bottles made of polymer material

A machine for blowing or stretch-blowing bottles or containers made of a polymer material having a plurality of molds which are movable on a transport system, wherein each of said molds has a front, a back, and a bottom and comprises a first half-mold and a second half-mold hinged about a hinge axis and a base, wherein each of said molds comprises:

• an actuation mechanism for synchronized actuation of the half-molds and the base actuated by an actuator, which is independent from motorization of the machine, to cyclically form, in cooperation with shaped portions, a closed cavity adapted to receive a preheated preform and to allow expansion by blowing or stretch-blowing of the preform inside the cavity to obtain a bottle or container, wherein the base is wedge-shaped and comprises a horizontal closing surface, facing the bottom of the mold, and an inclined surface, and wherein the actuation mechanism of the base comprises a wedge-shaped element having an inclined surface with an inclination descending towards the front of the mold, said inclined surface of the base and inclined surface of the wedge-shaped element being slidingly coupled to each other.