Injection molding apparatus
AssigneeNissei Plastic Industrial Co., Ltd.
InventorsTakemi Uehara, Kazuyuki Okubo, Hiroyuki Handa, Satoru Tokida
Life of this patent
Estimating the term…
Abstract
An injection molding apparatus includes an electric motor, a torque variable mechanism that changes an output torque of the electric motor, and a screw driving unit that transmits the output torque of the torque variable mechanism to a feed screw, whereby the feed screw is turned by the electric motor, the torque variable mechanism and the screw driving unit. The torque variable mechanism applies, to the feed screw, a torque equivalent to a hydraulic drive. The electric motor is interchangeable with a hydraulic motor to enable the injection molding apparatus to change between electric and hydraulic drive of the feed screw.
Claims15
An injection molding apparatus comprising:
- an electric motor that produces an output torque;
- a torque variable mechanism that changes the output torque produced by the electric motor to an output torque equivalent to that produced by a hydraulic drive;
- a screw driving unit connected to transmit the output torque produced by the torque variable mechanism to a screw, whereby the screw is turned by the electric motor, the torque variable mechanism, and the screw driving unit;
- an injecting cylinder connected to axially move the screw;
- an injecting device moving cylinder connected to jointly move the electric motor, the torque variable mechanism, the screw driving unit, and the screw together as a unit;
- and
- a hydraulic pump and hydraulic piping for supplying hydraulic pressure to the injecting cylinder and the injecting device moving cylinder, the hydraulic pump being driven by means other than the electric motor.
In an injection molding apparatus having a rotatable feed screw for feeding melted resin material to a mold cavity:
- a screw driving unit connected to rotationally drive the feed screw, the screw driving unit comprising a casing, and a relay shaft freely rotatable in the casing and having a driving end connected to the feed screw and a driven end;
- an electric motor driving unit detachably connectable to the casing and, when connected, engaging with the driven end of the relay shaft for rotationally driving the relay shaft;
- and
- a hydraulic motor driving unit detachably connectable to the casing and, when connected, engaging with the driven end of the relay shaft for rotationally driving the relay shaft,
- wherein one of the electric motor driving unit and the hydraulic motor driving unit is detachably connected to the casing and is interchangeable with the other of the electric motor driving unit and the hydraulic motor driving unit to change between electric drive and hydraulic drive of the feed screw.
Dependencies are inferred from the claim text.