Blowing mold for blowing thermoplastic material containers

A blowing mold for a thermoplastic material container, comprising two half molds hinged together and a cyclic opening and closing device adapted to reciprocally move away and approach the two half molds with an opening angle ranging from 0° in a closed position of the half molds to a maximum opening angle in a position of maximum opening of the two half molds,

• the cyclic opening and closing device comprising a control shaft adapted to rotate about an axis Z thereof, a control hub integrally fixed to the control shaft, at least one first connecting rod and at least one second connecting rod, each having a first end hinged to a respective half mold and a second end hinged to the control hub, wherein a rotation of the control shaft by an angle of rotation β corresponds to the position of maximum opening of the two half molds,
• wherein the control hub is fixed in a removable manner to an end of the control shaft and is provided with at least three holes for hinging the second ends of said at least one first connecting rod and at least one second connecting rod, wherein the at least three holes define at least two different pairs of holes, of which a first pair defines a first maximum opening configuration of the half molds corresponding to a first maximum opening angle α1, and a second pair defines a second maximum opening configuration of the half molds corresponding to a second maximum opening angle α2, with α2 being smaller than α1,
• and wherein the at least one first connecting rod and the at least one second connecting rod are fixed to a respective hole of the first pair of holes when the mold can operate in the first maximum opening configuration, and
• the at least one first connecting rod and the at least one second connecting rod are fixed to a respective hole of the second pair of holes when the mold can operate in the second maximum opening configuration.