| 摘要 |
<p>A system for switching and controlling a unit amount of torque limit values of a servo motor for an injection molding machine, in which a torque instruction (e) from a servo circuit (8) to a servo motor (M) for driving the injector is so controlled that the injection pressure, keeping pressure and back pressure are set at their optimum values. At the time of measurement, the output level of a D/A converter (9) which receives a torque limit instruction (g) is decreased at a constant rate to decrease the unit amount of torque limit level compared with the time of injection, so that the unit amount of torque limit for the back pressure at the time of measurement becomes smaller than that of torque limit for the injection pressure and keeping pressure at the time of injection. In comparison with the time of injection, therefore, the torque limit values at the time of measurement and kneading can be set smaller and finely in smaller unit amounts.</p> |
