Patent ID: 8496464

Claim:
A closure assembly of the type with a multi-rod drive for a machine or system for an injection moulding of a plastic material comprising: a plurality of closing rods each associated with a respective nozzle or injection unit for the an injection of the plastic material into a mould; a driving plate common to said plurality of closing rods and associated with an end of each closing rod of said plurality of closing rods, said driving plate being capable of moving between an open position and a closed position in order to contemporarily drive said plurality of closing rods between a corresponding open position, in which each closing rod opens an injection hole of the respective injection unit, and a corresponding closed position, in which the closing rod closes said injection hole of the respective injection unit; and disconnecting and fixing means that are associated with each closing rod of the plurality of closing rods for disconnecting a respective end of each closing rod of the plurality of closing rods from said driving plate, independently from the other closing rods, and for firmly fixing said end of each closing rod, once disconnected, to a fixed part of said mould, whereby, when a closing rod of said closure assembly is disconnected from said driving plate and fixed to said mould through said disconnecting and fixing means, the other closing rods of said closure assembly that remain connected to the driving plate can continue to be used and driven in order to inject, by the respective injection units, the plastic material into the mould, wherein said disconnecting and fixing means comprise a disconnecting element that is associated with said driving plate and houses said end of the closing rod, and wherein said disconnecting element, by rotating about an axis of a respective closing rod, is capable of moving, with respect to the driving plate, between a first operative position, in which the disconnecting element is connected to the driving plate and is disconnected from the mould, whereby the closing rod is free from the mould and is adapted to be driven by the driving plate when moving between the respective open and closed position, and a second operative position, in which the disconnecting element is disconnected from the driving plate and is connected to the mould, whereby the closing rod remains firmly fixed to the mould and is not adapted to be driven by the driving plate when moving between the respective open and closed position.