Mold clamping apparatus of injection molding machine

A mold clamping apparatus of an injection molding machine, comprising:

• a first drive mechanism for opening/closing a mold at high speed through advancement/retreat of a movable platen effected by means of a first drive motor unit and a first ball screw mechanism;
• a second drive mechanism for clamping the mold at high pressure through application of pressure to a pressing member effected by means of a second drive motor unit and a second ball screw mechanism, wherein said second drive mechanism comprises two drive motors and two ball screw mechanisms, which are disposed on opposite sides of said first drive mechanism;
• an engagement mechanism for engaging the movable platen with the pressing member in the course of advancement of the movable platen;
• and
• a clutch mechanism which is operated after establishment of the engagement effected by the engagement mechanism, in order to interlock the pressing member with the movable platen to thereby enable the pressing member to apply pressure to the movable platen.