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.

Abstract: An injection molding apparatus is on the basis of a hydraulic injection molding device, and the apparatus includes an electric motor, a torque variable mechanism that changes output torque by the electric motor, and a screw driving unit that transmits the output torque by the torque variable mechanism to a screw. The screw is turned by the electric motor, the torque variable mechanism, and the screw driving unit. The torque variable mechanism applies, to the screw, torque equivalent to a hydraulic drive.

Abstract: An injection molding machine includes an injection apparatus having a screw rotation driving section for rotating a screw inserted to a heat sleeve and a screw forward/rear move driving section for forwardly or rearwardly moving the screw at least by a hydraulic cylinder, including a unique screw for which an L/D ratio between a screw length and a screw diameter is set as a specific value to the injection apparatus. The injection apparatus includes a cylinder attachment mechanism having a cylinder detachable section that provides the detachability of at least two or more different types of hydraulic cylinders adaptable to a molded piece that can be molded by the unique screw.

Abstract: There are provided a first process T1 in which a mold clamping motor 4 is driven-controlled so as to move a cross head 5h of a toggle link mechanism 5 to a preliminary position Xr set in advance so as to become a position on the mold open side rather than a mold closure position Xs; a second process T2 in which after the first process T1 is finished, a mold thickness adjusting motor 2 is driven-controlled so as to move a pressure receiving platen 3 forward to a mold closed position Xc where a mold C is closed; a third process T3 in which after the second process T2 is finished, the mold clamping motor 4 is driven-controlled so as to move the cross head 5h forward, while the mold C is pressurized by torque limitation of the mold clamping motor 4, and the mold thickness adjusting motor 2 is driven-controlled so as to move the pressure receiving platen 3, while the cross head 5h is moved to the mold closure position Xs; and a fourth process T4 in which, after the third process T3 is finished, a clamping margin L

Abstract: There are provided a first process T1 in which a mold clamping motor 4 is driven-controlled so as to move a cross head 5h of a toggle link mechanism 5 to a preliminary position Xr set in advance so as to become a position on the mold open side rather than a mold closure position Xs; a second process T2 in which after the first process T1 is finished, a mold thickness adjusting motor 2 is driven-controlled so as to move a pressure receiving platen 3 forward to a mold closed position Xc where a mold C is closed; a third process T3 in which after the second process T2 is finished, the mold clamping motor 4 is driven-controlled so as to move the cross head 5h forward, while the mold C is pressurized by torque limitation of the mold clamping motor 4, and the mold thickness adjusting motor 2 is driven-controlled so as to move the pressure receiving platen 3, while the cross head 5h is moved to the mold closure position Xs; and a fourth process T4 in which, after the third process T3 is finished, a clamping margin L