Molding machine

A molding machine comprising:

• an injection device configured to inject a molding material into a cavity in a clamped mold;
• and a control device configured to control the injection device, wherein
• the injection device
• includes a heating cylinder to be filled with the molding material and a screw to move forward and backward inside the heating cylinder and also to inject the molding material filled in the heating cylinder, and
• is configured to be capable of moving forward and backward to the mold between a communication orientation where a distal end of the heating cylinder communicates with the clamped mold and a separation orientation where the distal end of the heating cylinder is separated from the mold and to be capable of pivoting on a pivot shaft between the separation orientation not allowing insertion and removal of the screw and a pivot orientation allowing insertion and removal of the screw, and
• the molding machine further includes a sensor to detect an orientation of the injection device, and
• the control device determines that the screw in the heating cylinder has been replaced in accordance with detection by the sensor that the injection device pivots from the separation orientation to the pivot orientation and again returns to the separation orientation.