INJECTION DEVICE, MOLDING MACHINE, AND METHOD FOR CONTROLLING INJECTION DEVICE

摘要

An injection device (13) is provided with: a stationary side frame (40) for supporting a barrel (41) which is an example of an injection unit; a movable side frame (43) for rotatably supporting a screw (42) which is an example of an extrusion member; a pair of ball screws (61, 66); and injection drive mechanisms (51, 52) comprising servomotors (60, 65) for rotating the ball screws (61, 66). A force detector (80) such as a load cell is provided between the first ball screw (61) and the movable side frame (43). A dummy member (81) is provided between the second ball screw (66) and the movable side frame (43). A control unit (14) controls the first injection drive mechanism (51) on the basis of the output from the force detector (80), and controls the second injection drive mechanism (52) on the basis of the output from the force detector (80) and the calculation made taking into account the respective spring constants of the force detector (80) and the dummy member (81).