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
1988-03-07
1989-01-17
Hoag, Willard
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
137486, 1374875, 425149, 425542, B29C 4577, B29C 4582
Patent
active
047985275
ABSTRACT:
An electrohydraulic servo system for controlling pressure of fluid in a cavity of undetermined volume includes a valve having a valve spool element and ports for supplying fluid as a function of position of the valve element within the surrounding valve body. A servo valve is responsive to electronic valve control signals for controlling pilot pressure within the main valve body and thereby controlling position of the valve element. An electronic valve controller receives a pressure command signal from remote master electronics as a function of desired fluid pressure within the cavity volume, and a pressure feedback signal indicative of fluid pressure within the cavity volume from a pressure sensor coupled to the valve output ports. The pressure command signal is compared to the pressure feedback signal in a pressure-control mode of operation, and a difference or error signal is employed for generating valve control signals to the servo valve. A second sensor is coupled to the valve element for supplying a position feedback signal as a function of position of the valve element within the surrounding valve body.
REFERENCES:
patent: 3767339 (1973-10-01), Hunkar
patent: 3779680 (1973-12-01), Manceau
patent: 3904078 (1975-09-01), Neff et al.
patent: 3920367 (1975-11-01), Ma et al.
patent: 3941534 (1976-03-01), Hunkar
patent: 4161380 (1979-07-01), Bishop
patent: 4349324 (1982-09-01), Neff et al.
patent: 4411609 (1983-10-01), Yoshii et al.
Hoag Willard
Vickers Incorporated
LandOfFree
Control system for injection molding machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control system for injection molding machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control system for injection molding machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2412241