Injection molding machine

An injection molding machine for molding an article by injecting resin into a mold, said injection molding machine comprising:

• an ejector for ejecting a molded article from the mold by actuating an ejector rod to produce a set ejecting force and advance to a set forward end position of an ejection stroke;
• first determining means for automatically determining whether or not the mold has been changed;
• second determining means for automatically determining whether or not a setting of the forward end position of the ejection stroke has been changed;
• position detection means for detecting a position of a distal end of the ejector rod of said ejector during actuation of the ejector rod;
• first setting means for setting the ejecting force to a protective ejecting force lower than a normal ejecting force when said first determining means determines that the mold has been changed or said second determining means determines that the setting of the forward end position of the ejection stroke has been changed;
• and
• second setting means for setting the ejecting force to the normal ejecting force when said position detecting means detects that the distal end of the ejector rod has reached the set forward end position of the ejection stroke during actuation of the ejector rod to produce the set protective ejecting force.