Machine for blow-moulding containers from extruded parisons

Machine for blow-moulding bottles or other containers formed from parisons produced by an extruder, characterized in that it comprises on a special platform a main rectilinear and horizontal guide which is parallel to the longitudinal axis of the extruder and which with its middle part is situated along the side of the extrusion head which discharges the row of parisons perpendicularly with respect to the said guide on which a primary and motor-driven carriage slides, said carriage having, mounted thereon perpendicularly with respect to the said primary guide and with an arrangement parallel to each other, two horizontal guide and slide units with associated secondary carriages on which a respective mould/counter-mould unit may be mounted, with the cavities situated in a vertical plane parallel to the ideal plane of the parisons produced by the extruder and on each of these units there being mounted a blowing station with a set of nozzles vertically movable on a support structure fixed to the said primary carriage, process means being envisaged for ensuring that, by imparting alternating movements to this primary carriage, one of the said secondary carriages with the associated mould/counter-mould unit may be aligned with the extrusion head and, by means of a centralized displacement actuator, this secondary carriage may be displaced so as to insert the associated mould/counter-mould unit underneath the said extrusion head so as to be loaded with corresponding parisons, following which this closed and loaded mould/counter-mould unit is moved away from the extrusion head and at the end of this travel stroke is positioned underneath its blowing station which performs forming of the containers, while the primary carriage is displaced so as to move away the mould/counter-mould unit which is performing the forming step and replace it with the other mould/counter-mould unit which in synchronism is opened and is inserted underneath the extrusion head, while the containers formed in it during the previous cycle remain suspended from the nozzles of the associated blowing station and are gripped and discharged by special means, and means are envisaged for ensuring that the cycle described is repeated with a mould and counter-mould unit which is cyclically loaded with parisons and is displaced for the container blow-moulding step, while the other mould and counter-mould unit is prepared for unloading the containers formed during the previous cycle and then insertion inside the parison supply station.