Patent ID: 6893250

Claim:
A closing and clamping system ( 10 ) for an injection molding machine ( 1 ), the machine comprising a fixed mold half ( 4 ) mounted on a fixed plate ( 3 ) integral with a machine frame ( 2 ) and a moveable mold half ( 9 ) mounted on a moveable plate ( 8 ) supported in translation on the machine frame ( 2 ) and guided along guide columns ( 5 ) integral with the fixed plate ( 3 ), to pass from a mold closing position, wherein the two mold halves ( 4 , 9 ) are coupled together defining a cavity for injection of the plastic material, to a mold opening position, wherein the two mold halves ( 4 , 9 ) are spaced apart from each other to allow ejection of the molded product, the closing and clamping system ( 10 ) comprising clamping means, integral with said moveable plate ( 8 ) and acting on a portion of said guide columns ( 5 ) to lock the moveable plate ( 8 ) in position, when it is in the mold closing position, characterised in that said clamping means comprise a plurality of locking inserts ( 22 ) mounted slidably in seats ( 21 ) of a body ( 13 ) integral with said moveable plate ( 8 ) to pass from a non clamping position to a clamping position in which they act, in a locking relationship, on said guide columns ( 5 ), each locking insert ( 22 ) having a circular hole ( 25 ) to receive an eccentric shaft ( 26 ) in an eccentric position, so that the rotation of said eccentric shaft ( 26 ) causes the translational movement of said insert ( 22 ), drive means being provided such as to set said eccentric shafts ( 26 ) in rotation synchronously, to allow opening/closing of said clamping means.