| 摘要 |
PURPOSE:To obtain a mold clamping device, the mold opening and closing speed of which is fast and at the same time the mold clamping force of which is large even when a small capacity motor is employed, by a structure herein an actuator, which generates the force and displacement in proportion to the quantity of electricity. CONSTITUTION:Firstly, a ball screw shaft 15 is advanced rightwards through a transmission mechanism consisting of a timing belt 12 and pulleys 13 and 14 by means of the rotation of a servomotor 11 so as to abut a moving mold 21 against a stationary mold 18 at their mating mold surfaces A. Secondly, when the predetermined voltage is applied to a piezoelectric actuator 19, the piezoelectric actuator 19 tends to elongate itself axially, though the dimension between the mold 21 and the pulley 14 is restricted, and consequently the molds 18 and 21 are more strongly clamped with each other through wedge action. When a braking mechanism 22 is applied before the application of the voltage to the piezoelectric actuator 19, no slackness develops and consequently more effective mold clamping can be done. |
