PROBLEM TO BE SOLVED: To facilitate the location adjustment of a sensor by making an ejector rod retreat through a ball screw mechanism by a rotating motion of a motor, and fixing the sensor for detecting the rear end limit location of the ejector rod to a pleated section on the outer periphery of the motor, in an ejector device which takes out a molded article from a die in an injection molding machine. ;SOLUTION: Power is turned on for an ejector motor 102, and by rotating the rotor, a ball nut fixed to the rotor is rotated, and a ball screw shaft 121 which is screwed with the ball nut is made to perform a linear motion, and a cross head 25 is advanced/retracted in the direction A along a guide bar 18. By this constitution, a molded article is taken out from a die through an ejector rod 27 which is fixed to the cross head 25, and an ejector pin. In this case, a bolt 30 is fixed between a pair of plates being adjacent, which are fins formed on the outer surface of a stator frame 104c, and a sensor 32 which detects the retreat limit location of the cross head 25 is location-adjustably fixed in the length direction of the pleats by using the bolt 30.;COPYRIGHT: (C)2000,JPO
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