| 摘要 |
<p>Straight-acting mold-clamping device in an injection molding machine driven by two motors to close and open the mold at high speeds without large capacity but maintaining a required mold-clamping force. When a moving platen (1) driven by a servo motor (10) reaches the metal mold touch position at high speeds, distribution pulses are applied to an error register in a servo circuit (25) in an amount corresponding to the amount of movement from the metal touch position to a setpoint mold-clamping force generating position. Further, the moving platen is driven in the direction of clamping the metal mold by an induction motor (12) with a large force. Thereafter, pulse signals are supplied from the position detector to the error register accompanying the movement of the moving platen, and the value of the register gradually decreases. As the value of the register becomes zero, it is so determined that the setpoint mold-clamping force generating position is reached, whereby the induction motor is damped by a braking device (13) to generate a required mold-clamping force. The moving platen is then driven by the servo motor at high speeds in the direction of opening the mold.</p> |
