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US 5,269,672 AGranted
Servo stretch assembly for blow molding machine
AssigneeHoover Universal, Inc.
InventorVincent R. DiGangi, Jr.
Life of this patent
Estimating the term…
Abstract
A servo stretch assembly for blow molding hollow injection molded preforms in which the stretch rod is driven by a servo motor that is electronically controlled to produce a precise and repeatable stretch stroke and stretch profile.
Claims8
In a machine for blow molding a hollow injection molded preform having an open end and a closed end, a stretch assembly for stretching said preform longitudinally comprising:
- a stretch rod insertable into said preform open end to longitudinally stretch said preform;
- a movable bridge plate to which said stretch rod is mounted, said bridge plate being movable in the longitudinal direction of said preform;
- a servo motor having a rotatable output shaft for moving said movable bridge plate and said stretch rod longitudinally into and out of said preform;
- a threaded screw shaft coupled to said output shaft for rotation with said output shaft and threadably coupled to said bridge plate for moving said bridge plate and said stretch rod longitudinally in response to rotation of said output shaft;
- guide means engaging said bridge plate for preventing rotation of said bridge plate and for guiding longitudinal movement of said bridge plate in response to rotation of said screw shaft;
- and
- electronic control means for operating said servo motor.
4 more elements
In a machine for blow molding a hollow injection molded preform having an open end and a closed end in a blow mold assembly, a stretch assembly for stretching said preform longitudinally comprising:
- a stretch rod insertable into said preform open end to longitudinally stretch said preform within said blow mold assembly;
- a threaded screw shaft extending in the longitudinal direction of said preform;
- a movable bridge plate normal to said screw shaft and threadably coupled to said screw shaft, said bridge plate carrying said stretch rod and being spaced from the open end of said preform in said mold assembly;
- guide rods parallel to said screw shaft and extending through said bridge plate for guiding movement of said bridge plate and for preventing rotating of said bridge plate;
- a servo motor having a rotatable output shaft coupled to said screw shaft for rotating said screw shaft to move said stretch rod longitudinally into and out of said preform;
- and
- programmable microprocessor means for controlling said servo motor.
4 more elements
Dependencies are inferred from the claim text.