Patent ID: 8790103

Claim:
A screw mounting structure of an injection molding machine in which a screw is fixed to a screw driving portion which transmits a rotating force and forward and backward thrusts to the screw, wherein an engaging groove is formed in an outer periphery of a base portion of the screw, and a retainer for restricting axial movement of the screw is engaged with the engaging groove, and a fixing bushing for restricting movement of the screw in a rotating direction, having a hole through which the base portion of the screw is inserted and which has a key or a spline formed therein, is fixed to the screw driving portion, and wherein a guide groove for allowing the retainer, provided in a direction orthogonal to a rotary axis of the screw, to slide is formed in the fixing bushing and/or the screw driving portion, and a member for fixing the retainer, inserted through the guide groove, to the fixing bushing and a member for fixing the fixing bushing to the screw driving portion are provided to the fixing bushing.