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
1988-09-09
1989-09-19
Woo, Jay H.
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
425146, 425147, 425205, 425557, 425560, 425563, B29C 4792
Patent
active
048676659
ABSTRACT:
A plastic material molding apparatus, wherein when the pressure at a material inlet of a cylinder of a material holding mechanism increases as a piston in the cylinder compresses a resilient member provided in the material holding mechanism, the speed of a motor for driving a material fluidizing mechanism is reduced. A servo motor for intermittently driving a plastic material metering and delivering mechanism is controlled according to the revolution speed and a predetermined total number of revolutions of the servo motor and to the number of pulses from a pulse generator provided in the servo motor. A relief valve is interposed between a material delivery port and a delivery nozzle of the metering and delivering mechanism, the relief valve being adapted to open when the material pressure at the delivery port is higher than the relief pressure, the relief pressure being set higher than the vapor pressure according to the temperature of the material at the delivery port. When the amount of material delivered to the material holding mechanism reaches a specified volume, the fluidizing mechanism is made to continue its operation and the material contained in the material holding mechanism is discharged into the metering and delivering mechanism together with the material being delivered from the fluidizing mechanism.
REFERENCES:
patent: 2359840 (1944-10-01), Goessling
patent: 2881477 (1959-04-01), Triulzi
patent: 3611503 (1971-10-01), Blumer
Heitbrink Timothy W.
McGaughey Donald C.
Nakatani Kikai Kabushiki Kaisha
Nilles James E.
Woo Jay H.
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