Staas & Halsey
Direct-pressure type mold clamping mechanism
 A motor-operated, direct-pressure type mold clamping apparatus is capable of high-speed mold closing and opening operations and of producing a required mold clamping force, without the use of a large-sized motor. In the mold opening and closing operations, a ball screw, in engagement with a ball nut which is movable in one with a moving platen, is rotated at high speed by a motor through gears and a clutch, so that a die is opened and closed at high speed. In a mold clamping operation, the ball screw is driven with a large rotatory force transmitted through a clutch and gears which, having a high reduction ratio, serve to increase the rotatory force of the motor. Thus, dies are clamped with a large clamping force. 
Fanuc Ltd.
Y Y Y B
Y10S Y10T Y10T B29C
additional additional additional inventional
Fumio Yoshiharu Hiromasa
Mitoguchi Inaba Yamashita