Abstract: In order to obtain an injection drive apparatus which is low-priced, can produce a great output torque, and has a satisfactory acceleration/deceleration characteristic, in an injection-molding machine which performs injection by driving a screw by means of servomotors, one or more ball screws (7), used to drive a screw (2) in the axial direction, are driven by means of a plurality of servomotors (M1, M2), a position detector (P1) for detecting the screw position is provided only for one servomotor (M1), and the servomotors (M1, M2) are provided individually with power amplifiers, which are controlled by means of one control circuit so that the individual servomotors (M1, M2) are controlled in synchronism with one another.

Abstract: A large-output injection/measurement mechanism of an injection molding machine, which uses measurement and injection servo motors as its drive source. A plurality of ball screws are rotatably provided between front and rear plates of the injection molding machine and are coupled to the injection servo motor. Ball nuts engaged with the plurality of the ball screws are fixed on a pressure plate. The pressure plate is coupled to the measurement servo motor through a spline shaft and a rotational drive pipe spline-coupled thereto. The spline shaft is fixed on a screw sleeve rotatably fixed to the pressure plate. A screw fixed to the pressure plate is driven by the servo motors, thereby performing injection and measurement of a molding material.

Abstract: A mold opening/closing speed control device wherein an opening/closing speed switching position for molds in a mold clamping unit in an injection molding apparatus can be taught by the control device. The control device is set in a teaching mode (101), a servo motor (M) is driven at a low speed to move (102) the molds, speed switching positions P1, P2 and P3 are stored (103, 104, 205, 106, 109) by a teaching device, and the opening/closing speed control of the molds is performed (110, 123) by the servo motor in accordance with the stored positions.

Abstract: An injection molding apparatus for automatically presetting parameters of injection conditions by performing trial injection. A time (T0) and an injection quantity (C0) are obtained (step 124), wherein a drive current (I2) of a servo motor (M2) for performing trial injection reaches a drive current (i0, step 123) corresponding to a maximum injection pressure. Parameters (A, B, D) of the injection conditions stored in a memory, are read out in accordance with the detected time (T0) and the detected injection quantity (C0) to automatically set the injection conditions (step 131).

Abstract: A screw-rotating/injection mechanism of an injection molding machine has a screw shaft (1) having a rear portion thereof connected to a drive shaft (1') which is rotatably fixed to a pressure plate (4). A nut (6) which is spline-coupled to a spline shaft (5) constituting a rear portion of the drive shaft (1') is driven by a screw rotating motor (M1) through a first transmission unit (9, 10, 13, 15) to rotate the screw shaft (1). A ball screw (8, 8') threadedly engaged with a ball nut (7, 7'), fixed to the pressure plate (4), is driven by an injection servo motor (M2) through a second transmission unit (11, 11', 14, 16) to move the screw shaft (1) forward, thereby performing injection.

Abstract: An injection molding apparatus including a power transmission device is provided for axially moving a screw by a rotational force of a motor received through a first clutch. During non-injection/non-metering, the motor is driven to cause an energy accumulation device to accumulate energy through a second clutch. During injection, a driving force of the motor and the energy accumulated in the energy accumulation device achieve high-pressure, high-speed injection with good response characteristics.

Abstract: Gold is directly plated onto tungsten or molybdenum by an electroless plating process using a plating solution including a gold compound and having pH not less than 8, and desirably not less than 9.