Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Molding pressure control means responsive to pressure at...
Patent
1990-04-19
1992-06-30
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Molding pressure control means responsive to pressure at...
264 403, 264 407, 425150, B29C 4577
Patent
active
051258200
ABSTRACT:
This invention relates to an injection pressure control apparatus for a die cast machine and an injection mold machine. In the injection pressure control apparatus, it detects whether the pressure increase state of the instance when the pressure of the injection cylinder is increased through a pressure increasing circuit is normal or not. When detecting the above state, the pressure change obtained at the instance when the pressure increasing circuit is operated is detected between two points, of which it is determined whether the time spent therebetween is within an allowable time or not and the result is indicated. Moreover, the pressure detected after the pressure increasing circuit was operated and a predetermined period of time has passed is determined whether it is within a predetermined allowable range or not and the result thereof is indicated. Further, in the injection pressure control appratus for the injection mold machine, it is detected whether the detected pressure value at the instance when the pressure of the injection cylinder is increased and a predetermined measurement command signal is given is within an allowable range or not and the result thereof is indicated.
REFERENCES:
patent: 4583931 (1986-04-01), Fujita et al.
Cincinnati Milacron Pamphlet-Complete Automatic Manufacturing Activity Control-Mar. 1984.
Heitbrink Tim
Toshiba Kikai Kabushiki Kaisha
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