Inverting mechanism for a machine for shaping glass items

An inverting mechanism for a glassware forming machine comprising:

• a supporting structure;
• a shaft horizontally located on an upper part of the supporting structure to rotate on a horizontal axis of the shaft, said shaft including a longitudinal central passage with a closed end and an open end and, at least one exit passage connecting a central part of the central passage towards a surface part of the shaft, for introduction of a fluid under pressure;
• drive means coupled to the shaft to provide rotational movement to the shaft, on the horizontal axis of the shaft, left or right relative to the horizontal axis of the shaft;
• at least one cylindrical body having a front face and a rear face, each cylindrical body having a longitudinal hole in an eccentric reference axis, each cylindrical body being fixedly coupled to the shaft through its longitudinal hole, in an eccentric position;
• at least one hollow cylinder coupled to each cylindrical body, each hollow cylinder having supports coupled on an outer part of each hollow cylinder, which are connected to neck ring holder arms so that, by means of a first sliding movement of each hollow cylinder on each cylindrical body, provides a lateral movement right or left to open and close the supports of the neck ring holder arms in parallel and, by means of a rotational movement, to move the neck ring holder arms with a 180° movement from a parison mold to a final blow mold;
• at least one cover with one hole in eccentric position, each cover being coupled by means of its eccentric hole to a section of the shaft and, by a periphery of each cover, being fixedly coupled and coinciding with one end of each hollow cylinder, each cover sliding together with each hollow cylinder, wherein the front face of each cylindrical body and each cover form an intermediate chamber for an inlet of a fluid under pressure through the longitudinal central passage and each exit passage of the shaft, said chamber being in coincidence with each exit passage of the shaft;
• at least one adjustment element attached to the shaft and located in facing position with each cover, wherein coupling of each adjustment element and each cover forms a hollow internal space therebetween;
• and,
• retracting means located in said hollow internal space to provide a retracting motion to each hollow cylinder and to each cover sliding on said shaft, at a time of interrupting the fluid pressure, to parallelly close the supports of the neck ring holder arms.