Patent ID: 7862327
Filing Date: 2011-01-04
Classification: B29C,Y02P

Abstract:
1. Device for moulding thermoplastic containers by blow-moulding or stretch blow-moulding hot preforms, said device comprising a mould and blowing means comprising a blowing nozzle of the bell-nozzle type which is axially displaceable and driving means for displacing said blowing nozzle above said mould between a raised position in which the end of the nozzle is raised above the mould and a blowing position in which the end of the nozzle is in sealing abutment against the mould, which driving means comprise mechanical driving means including at least one cam follower roller integral with the nozzle, and at least one respective control cam against which said cam follower roller is maintained in abutment, the cam follower roller and the cam being in relative movement, wherein said driving means further comprise pneumatic driving means which include: whereby it is the mechanical driving means with the cam follower roller in abutment against the cam which determine the speed of displacement of the nozzle, whilst the pneumatic driving means ensure the maintenance of the cam follower roller in abutment against the cam during the displacement of the nozzle and the locking of the nozzle in abutment against the mould during the blow-moulding phase, and whereby it also becomes possible that the pressurized fluid controlling the operation of the pneumatic driving means is not systematically discharged into the atmosphere and that the dead volumes may be reduced, making possible substantial savings in pressurized blowing fluid.