| 摘要 |
958,987. Injection moulding machines. C. C. GRAVESEN. April 24, 1962 [April 24, 1961], No. 15573/62. Heading B5A. An injection moulding machine has an injection piston 13 which is operated by a toggle means 22, 23 during the feeding stroke, i.e. the first part of its stroke, and by a fluidpressure accumulator (not shown), during the injection stroke, i.e. the last part of its stroke. The machine, which is operated by one hydraulic jack 18, is initially in the open position shown in Fig. 1. The hydraulic jack 18 is operated to rotate a guide member 17 in a clockwise direction. This causes two toggles 8 . . . 11 to close the mould parts and at the same time causes the toggle 22, 23 to straighten and so perform the feeding stroke of piston 13. When this position (Fig. 2, not shown), has been reached a valve 34 is opened so that a piston 26, which has been held to the right by hydraulic fluid in cylinders 31, 32, is forced to the left by the pressure accumulator and, through the straight. ened toggle 22, 23, performs the injection stroke of piston 13. This toggle is kept straight by its pivot 24 engaging in a slot 21 in a plate 17. After injection the jack 18 is operated to return the parts to the initial position and the piston 26 is forced to the right by a traverse 35 and rod 36 and hydraulic fluid is sucked into the cylinders 31, 32 to hold the piston in this position against the action of the pressure accumulator which is connected to a conduit 28.
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