Electric split nut opening/closing device in mold clamping apparatus

1. Field of the Invention There is provided an electric split nut opening/closing device in which an electric motor is driven, and a half piece is moved linearly while the motion is restrained unequivocally, by which two left and right tie bars can be opened and closed at the same time by one device. In the electric split nut opening/closing device in which a tip-end threaded portion of a tie bar , one end of which is fixed to either one of a fixed platen and a movable platen and the other end of which is projected by penetrating the other platen, is engaged with split nut provided on the other platen to connect the fixed platen to the movable platen , by which a mold clamping force is generated between the platens by giving tension to the tie bar , a pair of left half piece and right half piece of the split nut are slidably supported so as to hold the tie bar therebetween, and the left half piece and right half piece of the two sets of split nuts and are brought into contact with and separated from each other at the same time by common driving means so as to hold the tie bar