Electric direct-acting die clamping unit of an injection...

Details Electric direct-acting die clamping unit of an injection... Electric direct-acting die clamping unit of an injection...

2006-01-10

2006-01-10

Mackey, James P. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to close mold

C425S451700, C425S595000

Reexamination Certificate

active

06984120

ABSTRACT:
An object of the present invention is to suppress a clamping force from sharply increasing when dies are clamped in an electric direct-acting die clamping unit of an injection molding machine. A movable platen is arranged to face a stationary platen. A stationary die is attached to the front surface of the stationary platen, whereas a movable die is attached to the front surface of the movable platen. The movable platen is connected to the front surface of a backup plate via four coil springs. A nut of a ball screw is fixed at each of diagonally-opposed corners of the backup plate. The threaded rod of the ball screw passes through the backup plate via the nut. The tip portion of the threaded rod is rotatably connected to the stationary platen. The rear end portion of the threaded rod is connected to a motor.

REFERENCES:
patent: 4702688 (1987-10-01), Schenk
patent: 5352394 (1994-10-01), Fujita et al.
patent: 6254371 (2001-07-01), McNally et al.
patent: 6270333 (2001-08-01), Tamaki et al.
patent: 298 21 379 (1998-04-01), None
patent: 0 275 318 (1988-07-01), None
patent: 64-45616 (1989-02-01), None

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