Patent ID: 7387509

Claim:
An injection molding machine wherein an injection pot provided with an injection nozzle and a feeding port for supplying a formed material put in a plasticized state from a side part into the pot are formed in a barrel, comprising: a plunger slidably disposed in the injection pot; a tip part on said plunger, the tip part being formed in such a shape that a tip part of the injection pot can be generally filled with the formed material when an injection of the formed material is completed; a fitting part pressingly cutting off the formed material in the injection pot, the fitting part including a boundary part between a body part of the plunger and said tip part of the plunger, the fitting part being formed at a boundary part between a body part of the injection pot and the tip part thereof; and wherein a clearance is formed between the tip part of the plunger and the tip part of the injection pot in the fitting part or below and the feeding port is opened to the fitting part in the plunger when the tip part of the plunger is inserted into the tip part of the injection pot so as to generally fill the tip part of the injection pot.