Improved apparatus for blow molding and conditioning synthetic resin containers, of the type comprising:
- at least one extruder, fed with granules of a predetermined synthetic resin, from the extrusion head of which, that points downwards and defines an extrusion station, issues in an unbroken fashion a tubular element made of the said synthetic resin;
- two end walls, able to slide supported and guided by first support means, to which are locked in a removable fashion and in opposite position, corresponding permanent molds which, when in the closed position, jointly define a vacuum forming mold whose upper part is provided with a mouth that communicates with the outside and whose inside part contains the profile of a corresponding container;
- means for operating the said end walls, the actuation and deactuation of which constitute, for the aforementioned permanent molds, the said position of closure and an open position, respectively;
- means for synchronizing, in opposite directions, the translation of the said end walls;
- a saddle that carries the aforementioned support means and slides on rectilineal guides perpendicular to the translation direction of the said end walls, the inclination of the said guides being such as to decrease the elevation of the said end walls, starting at the said extrusion station;
- means for driving the said saddle between the said extrusion station and a blow molding station;
- means for shearing the said tubular element, the lower part of which is stably held under restraint in the vacuum forming mold at the time the said permanent molds are in the position of closure, in consequence of the translation of the said end walls from the extrusion station to the blow molding station;
- at least one nozzle, connected to a source of compressed air, movable vertically, positioned at the said blow molding station and destined to be hermetically inserted into the mouth of the said vacuum forming mold;
- gripping means, integral with the said end walls, destined to hook onto the container hanging on the said nozzle, to release the said container from the said nozzle, and to deposit the said container on a suitable conveyor;
- means for controlling the said operating means, destined to actuate and deactuate them compatibly with the positioning of the said end walls at the extrusion station and at the blow molding station, respectively, in the latter case at a time subsequent to the insertion of compressed air into the said vacuum forming mold;
- a tubular shaft that at least partially houses in the inside thereof the aforementioned operating means;
- a coupling sleeve fixed to the center of said shaft, said coupling sleeve being positional above and integral with said saddle;
- at least two bushes coupled to said shaft in a way whereby they are able to slide, said two bushes being positioned bilaterally to said coupling sleeve and each of said bushes being locked to one of two end walls;
- fixing means for locking said two bushes to said two end walls;
- means for locking one to the other, the coupling means and the said shaft, destined to prevent any rotation of the latter with respect to the axis thereof;
- and means for coupling one to the other in a sliding fashion and in the direction parallel to the axis of the said shaft, each end wall and the said saddle, destined to prevent any rotation of the said end wall with respect to the axis of the said shaft.