| 摘要 |
An injection device of an injection molding machine generally comprises a heating cylinder, a screw member disposed therein, and a drive system for driving the screw member. The heating cylinder is provided at its front end with a cylinder head comprising a first portion having an inner frustoconical configuration and being continuous to the front end of the heating cylinder and a second portion being continuous to the first portion and having an inner diameter smaller than that of the heating cylinder. The inner surfaces of the heating cylinder, the first and second portions of the cylinder head are connected linearly smoothly with each other. The screw member consisting of a first screw portion having outer diameter slightly smaller than the inner diameter of the heating cylinder, a second screw portion having outer diameter slightly smaller than the inner diameter of the first portion of the cylinder head, and a third screw portion having an outer diameter slightly smaller than the inner diameter of the second portion of the cylinder head.
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