| 摘要 |
PURPOSE:To contrive to improve the measuring accuracy and to stablize the quality of a molded product, by constituting a measuring means with a screw for transferring a material and a measuring housing covering this screw being set outside. CONSTITUTION:When a plunger 30 is injected, a rack 38 compresses a coil spring 41 and after the injection is completed, when the plunger 30 is returned, the rack 38 is released and energized upward to rotate a shaft 42 and then to rotate a screw blade 45, a housing 44 and a dam 52. A material is thereby sent out along the screw and fallen down from a hole 53. The plunger 30 is forwarded into a heated cylinder 31 and a molten resin is thereby injected from a nozzle 32. When the quantity of the resin in the heated cylinder 31 becomes smaller, the amt. of rotation of the screw blade rotated at the time when the plunger is returned becomes larger and the amt. of the resin being fallen becomes larger, too. On the contrary, when the amt. of the resin in the heated cylinder 31 becomes larger, the amt. of the resin fallen becomes smaller and a measuring action having an automatic balancing function is carried out. The forwarding and stopping position of the plunger 30 can be controlled by controlling a bolt 37.
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