PURPOSE: To improve product efficiency by grouping a plurality of cavities in a manner respective groups include one cavity or more, providing driving means used in common for respective groups and operating the driving means separately for respective groups.
CONSTITUTION: Two movable side compression cylinders are incorporated between a two-cavity optical disk mold and a molding machine movable platen. Hydraulic driving mechanisms of resin compression cylinders 11 are provided on respective core main bodies 2, 2 of an injection molding die 18 forming two disk-shaped cavities A consisting of cavity main bodies 1 forming a fixed side mold and core side main bodies 2 and outer peripheral rings 3 forming a movable side mold facing the cavity main body. Simultaneously respective compression cylinders 11 are connected with hydraulic control circuits 20 provided with hydraulic control valves 19 controlling respective compression cylinders individually in multi-stages, and the operation of respective core main bodies 2, 2 is constituted in a manner of multi-stage control for the combination of hydraulic force and time individually. The hydraulic operation mechanisms including the compression cylinders 11 are provided with cut punching cylinders 12 and ejection cylinders.
YAMAYA KENJI
SAKAI YUMI
KOYAMA ATSUSHI
NAMIKAWA YUICHI
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