Patent ID: 8690562

Claim:
A blowing mould for plastic containers comprising one or more moulding shapes, each of which comprises at least two half moulds, wherein at least one of the at least two half moulds is provided with two movable inserts for making undercuts, the two movable inserts being adapted to move with a reciprocating direction motion between an extended position inside the one or more moulding shapes and a retracted position during the operation, wherein there are provided a pair of separate cams, each cam being moved by a separate actuator, adapted to produce the motion of the two movable inserts, wherein said two cams are configured as elongated bars, wherein there are provided shaped grooves on one side of the elongated bars, wherein cam followers integral with the two movable inserts are inserted in the shaped grooves, wherein the shaped grooves are configured so as to produce various introduction times, or various forward movement paths, or various forward movement speeds of the two inserts.