| 摘要 |
PROBLEM TO BE SOLVED: To provide the nozzle touch mechanism of an injection molding machine capable of performing suitable nozzle touch by a simple constitution by requiring no pressure source. SOLUTION: A pressing force adjusting mechanism 7 for closely bringing a nozzle 4a into contact with a mold K1 by predetermined pressing force includes a first cylinder part 15, a second cylinder part 16, a pressure detection part 21, a changeover valve 20 and a control device 22. When an injection unit 4 is advanced and retracted, the front second pressure chamber R1 and the rear third pressure chamber R2 demarcated by the piston 16b of the second cylinder part 16 are allowed to communicate with each other and, when the injection unit 4 is advanced to bring the nozzle 4a into contact with the mold K1, the pressure of the first pressure chamber S2 of the first cylinder part 15 reaches a first pressure level, a first pressure chamber S2 and the second pressure chamber R1 are allowed to communicate with each other, the pressure of the first pressure chamber S2 and the second pressure chamber R1 allowed to communicate with each other reaches a second pressure level for closely bringing the nozzle 4a into contact with the mold K1 by the predetermined pressing force and the driving of an electromotor 11 is stopped to hold the predetermined pressing force. COPYRIGHT: (C)2008,JPO&INPIT
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