| 摘要 |
PROBLEM TO BE SOLVED: To perform gentle decompression control in hold pressure control by solving the problem that pressure cannot be maintained due to a small amount of leakage of oil when a small amount of the oil leaks when the compressibility of the oil is low in one using oil pressure as a drive source and it is difficult to perform the gentle decompression control at the time of a hold pressure/metering process. SOLUTION: In an injection process using an injection cylinder 15, a medium high in compressibility is supplied to the rear chamber of the injection cylinder and a pressure relieving means (a pressure relieving valve 51 and pressure relieving speed control valves 52 and 53) for relieving pressure in the pressure relieving process after the completion of the injection process is provided. Stable pressure can be held because the medium high in compressibility is used as the drive source and supplied to the rear chamber of the injection cylinder in the injection process and the pressure relieving means for relieving pressure is provided in the pressure relieving process after the completion of the injection process and the decompression control in hold pressure control can be performed by the pressure relieving means. COPYRIGHT: (C)2005,JPO&NCIPI
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