SCREW STRUCTURE OF INJECTION APPARATUS

摘要

PURPOSE: A screw structure of an injecting device is provided to block the backflow of a material since in a state slipping resistance decreased, a check ring rapidly moves from a screw head. CONSTITUTION: A screw structure of an injecting device(1) is mounted in a barrel(10). The screw structure comprises a check ring(30). The check ring is movably coupled between a screw head(21) and a spacer(22). A stopping projection(31) is formed on the surface of the check ring. The stopping projection is inserted into the insertion groove(21b) of the screw head. Both sides of the stopping projection have slopes(31a) inclined toward the screw head. Both slopes(21c) of the insertion groove match the slopes of the stopping projection.