| 摘要 |
PURPOSE: To stabilize a plastic lens injection process while enhancing productivity by obtaining the data 6f an injection cavity to preset an injection amt. and the insertion position of an injection pipe and correcting the data stored in a calculator at the next injection of the cavity on the basis of the difference between an injection completing time and an injection estimate time. CONSTITUTION: After the insertion position of an injection pipe to the cavity 9 formed by projected and recessed molds subjected to tape winding is detected, The data of the vol. of the cavity 9 and the data of the projected mold are obtained from the data recording medium corresponding to the cavity 9 and an injection pattern is preset to inject plastic. From the difference between the estimate time until the cavity 9 is filled with a monomer and the actual time until an injection full state sensor 4 acts, the setting of a flow rate by the position of a next injection valve opening and closing motor 3 is corrected to ensure a proper injection amt. These controls are performed by a calculator 5. |
