Apparatus for the production of slabs by means of vacuum vibro-compression of mixes arranged on a support, comprising a press provided with a press ram having vibratory devices, and a pressing surface on which the support with the mix may be positioned; the press comprising a vacuum bell provided with an inlet opening and an outlet opening, the apparatus comprising first means for generating the vacuum inside the vacuum bell, wherein it comprises: an entry chamber in the region of the inlet opening of the bell having a first opening which can be controllably closed and opened with a first gate adapted to prevent fluid communication between the outside and inside of the entry chamber and a second gate able to be controllably opened and closed, in the region of the inlet opening of the bell, and adapted to prevent fluid communication between entry chamber and the inside of the bell or to allow the passage of the support with the mix from the entry chamber to the inside of the bell; characterised by an exit chamber in the region of the outlet opening, having a third gate provided in the region of the outlet opening, able to be controllably closed and opened and adapted to prevent fluid communication between the inside of the bell and the inside of the exit chamber or to allow the passage of the support from inside the bell to the exit chamber, and a second opening which can be controllably closed and opened with a fourth gate which is adapted to prevent fluid communication between the inside of the exit chamber and the outside; said entry chamber and said exit chamber being connected to second vacuum generating means; wherein said second gate and said third gate are formed by the side surface of the vacuum bell and in that the bell is movable between a first lowered position in which it allows formation of the vacuum and a second raised position in which it allows the manual cleaning and maintenance operations to be performed. the press comprising a vacuum bell provided with an inlet opening and an outlet opening, the apparatus comprising first means for generating the vacuum inside the vacuum bell, wherein it comprises: an entry chamber in the region of the inlet opening of the bell having a first opening which can be controllably closed and opened with a first gate adapted to prevent fluid communication between the outside and inside of the entry chamber and a second gate able to be controllably opened and closed, in the region of the inlet opening of the bell, and adapted to prevent fluid communication between entry chamber and the inside of the bell or to allow the passage of the support with the mix from the entry chamber to the inside of the bell; characterised by an exit chamber in the region of the outlet opening, having a third gate provided in the region of the outlet opening, able to be controllably closed and opened and adapted to prevent fluid communication between the inside of the bell and the inside of the exit chamber or to allow the passage of the support from inside the bell to the exit chamber, and a second opening which can be controllably closed and opened with a fourth gate which is adapted to prevent fluid communication between the inside of the exit chamber and the outside; said entry chamber and said exit chamber being connected to second vacuum generating means; wherein said second gate and said third gate are formed by the side surface of the vacuum bell and in that the bell is movable between a first lowered position in which it allows formation of the vacuum and a second raised position in which it allows the manual cleaning and maintenance operations to be performed. an entry chamber in the region of the inlet opening of the bell having a first opening which can be controllably closed and opened with a first gate adapted to prevent fluid communication between the outside and inside of the entry chamber and a second gate able to be controllably opened and closed, in the region of the inlet opening of the bell, and adapted to prevent fluid communication between entry chamber and the inside of the bell or to allow the passage of the support with the mix from the entry chamber to the inside of the bell; characterised by an exit chamber in the region of the outlet opening, having a third gate provided in the region of the outlet opening, able to be controllably closed and opened and adapted to prevent fluid communication between the inside of the bell and the inside of the exit chamber or to allow the passage of the support from inside the bell to the exit chamber, and a second opening which can be controllably closed and opened with a fourth gate which is adapted to prevent fluid communication between the inside of the exit chamber and the outside; said entry chamber and said exit chamber being connected to second vacuum generating means; wherein said second gate and said third gate are formed by the side surface of the vacuum bell and in that the bell is movable between a first lowered position in which it allows formation of the vacuum and a second raised position in which it allows the manual cleaning and maintenance operations to be performed.