| 摘要 |
<p>An in-line screw type injection molding machine having a screw (12) in a heating cylinder (11). The screw is driven and rotated by a motor (13) to charge a feedstock resin into the cylinder, the screw simultaneously undergoing retracting movement to allow the molten resin to be stored in the cylinder (11), and is driven and advanced to inject the molten resin. The machine includes an oscillator (23) for outputting a movement signal in accordance with the retracting movement of the screw, a first calculator (25a) for calculating, from the movement signal, the position of the screw, and for outputting a position-detection signal, a position command signal generator (25b) for outputting a screw position command signal with the initial position at which the screw has started its retracting movement serving as the reference, a second calculator (25c) for calculating the difference between the position command signal and the position detection signal, and for outputting a difference signal, and a control section (25d) for controlling the driving of the motor on the basis of the difference signal. Preferably, the machine further includes a detector (16) for detecting the number of revolutions per unit time of the screw, and for outputting a number of revolutions detection signal, so that the control section (25d) may correct the difference signal on the basis of the number of revolutions detection signal. <IMAGE></p> |
