Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Mold motion or position control
Patent
1991-08-29
1993-06-15
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Mold motion or position control
264405, 425589, B29C 4580
Patent
active
052195848
ABSTRACT:
An oil circuit in which a meter-in circuit and a differential circuit are combined is disposed. Oil is supplied from a variable capacity pump in order to make a mold opening/closing control apparatus operate. A position instruction signal obtained by integrating a velocity instruction signal and a positional deviation of the displacement of the mold opening/closing control apparatus are obtained. A flow-rate instruction signal is set by the positional deviation. Then, a differential switching determining section receives the positional deviation and determines differential switching, following which a differential change-over valve switches between the meter-in circuit and the differential circuit. With a gain switching section connected to the differential switching determining section, the gain switching section switches between a pump gain for the meter-in circuit and a pump gain for the differential circuit. The above variable capacity pump is controlled by the switched pump gain. A fixed capacity pump may be connected to the variable capacity pump and used. In such a case, switching between un-load and on-load is performed in response the reception of a flow-rate instruction signal from the gain switching section.
REFERENCES:
patent: 4992036 (1991-02-01), Herdtner et al.
patent: 5052910 (1991-10-01), Hehl
Itsuzi Yoshiyasu
Yakata Tateo
Heitbrink Tim
Suitomo Heavy Industries, Ltd.
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