Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Patent
1995-11-27
1997-11-18
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
264 407, 425149, B29C 4577
Patent
active
056885350
ABSTRACT:
A drive control apparatus connects a hydraulic source 4 and an oil tank 5 to an injection cylinder 2 through a servo valve 3 and controls the injection cylinder 2 by the servo valve 3. A first change-over valve 6 which is connected between the hydraulic source 4 and the servo valve 3 and has a large capacity. A flow limiting circuit 9 connects a throttle valve 7 to a second change-over valve 8 having a small capacity in series and is connected to the first change-over valve 6 in parallel. A change-over valve control portion 10 opens both the first change-over valve 6 and the second change-over valve 8 when controlling a large rate of flow in an injection process or the like and controls to close the first change-over valve 6 when controlling a small rate of flow in a pressure maintenance process or the like. As a result, the first change-over valve 6 having a large capacity and the second change-over valve 8 (which is connected to the throttle valve 7 in series and has a small capacity) are opened so that the control suitable for the large rate of flow is performed when controlling the large rate of flow. When the first change-over valve 6 having a large capacity is closed, control of a small rate of flow is carried out.
REFERENCES:
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patent: 5059364 (1991-10-01), Okudo et al.
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patent: 5533884 (1996-07-01), Nakamura et al.
Arai Tsuyoshi
Koda Toshiyasu
Heitbrink Tim
Nissei Plastic Industries, Ltd.
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