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
1976-04-21
1977-04-26
Spicer, Jr., Robert L.
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
91 35, 91449, 91454, 222334, 425156, B29F 106, F15B 2102
Patent
active
040198456
ABSTRACT:
An injection-molding machine has a drive ram with a pressurizable chamber that can be connected either to the high-pressure side or the low-pressure side of a source of fluid under pressure. A control system operating this machine has a pressure-reducing valve with an inlet port connected to the high-pressure side of the source, an outlet port connected through a cut-off valve and a throttle to the chamber of the ram, and a pilot port pressurizable to control the pressure at this outlet port. A pressure-relief valve has an inlet port connected to the pressurizable ram chamber, an outlet port connected to the low-pressure side of the pressure source, and a pilot port pressurizable to control the pressure differential across this pressure-relief valve. A pressure-control valve has an outlet side connected to the low-pressure side of the source and an inlet side and is operable to maintain a first predetermined pressure differential between its inlet and outlet sides in an injection mode and to maintain a certain predetermined pressure differential between its inlet and outlet sides in a clamping mode. A check valve has one side connected to the pilot port of the pressure-reducing valve and another side connected to the pilot port of the pressure-relief valve for fluid flow only from the former to the latter. A function-control valve has a first connection coupled to the inlet side of the pressure-control valve and a second and third connection each coupled to a respective one of the pilot ports. This function-control valve is operable between a filling position connecting the pilot port of the pressure-relief valve to the pressure-control valve and an injecting/holding position connecting the pilot port of the pressure-reducing valve to the pressure-control valve.
REFERENCES:
patent: 2789541 (1957-04-01), Gaspar et al.
patent: 3537356 (1970-11-01), Odell
patent: 3695800 (1972-10-01), Hutchinson
patent: 3840312 (1974-10-01), Paulson
patent: 3894824 (1975-07-01), Wells
patent: 3911677 (1975-10-01), Collins
Birkhofer Hans
Schrammel Werner
Stohr Arno
Briggs W. R.
Klockner-Werke AG
Spicer, Jr. Robert L.
Striker Michael J.
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-2085188