Injection apparatus for injection molding machine

An injection apparatus for a motor-driven injection molding machine having a barrel unit configured to heat and plasticate polymer material, and a screw disposed in the barrel unit rotatably and movably in the axial direction, said apparatus comprising:

• a first rotating shaft having one end connected to a rear end of the screw:
• a ball screw mechanism consisting of a second rotating shaft having a threaded rod portion, and a threaded nut member engaging with the threaded rod portion;
• an injection carriage having a front plate configured to mount the barrel unit thereon, and a rear plate configured to support the second rotating shaft at the rear end thereof;
• an intermediate mount plate, disposed movably between the front plate and the rear plate, configured to link the first rotating shaft to the second rotating shaft coaxially with a predetermined distance spaced apart between the rear end of the first rotating shaft and the front end of the second rotating shaft;
• a charging motor configured to drive the first rotating shaft for rotation, and mounted on the intermediate mount plate;
• and
• an injection motor configured to drive the threaded nut member of the ball screw mechanism for rotation, and mounted on the rear plate of the injection carriage,
• said charging motor having a rotor fitted coaxially with the first rotating shaft wherein said injection motor is provided with a rotor formed integrally with the threaded nut member of the ball screw mechanism.

An injection apparatus for a motor-driven injection molding machine having a barrel unit configured to heat and plasticate polymer material, and a screw disposed in the barrel unit rotatably and movably in the axial direction, said apparatus comprising:

• a first rotating shaft having one end connected to a rear end of the screw;
• a second rotating shaft having a threaded rod portion;
• a threaded nut member engaging with the threaded rod portion;
• an injection carriage having a front plate for mounting the barrel unit thereon, and a rear plate with the threaded nut member fixed thereon;
• an intermediate mount plate, disposed movably between the front plate and the rear plate, configured to link the first rotating shaft to the second rotating shaft coaxially with a predetermined distance spaced apart between the rear end of the first rotating shaft and the front end of the second rotating shaft;
• a charging motor configured to drive the first rotating shaft for rotation, and mounted on the intermediate mount plate;
• an injection motor configured to drive the second rotating shaft for rotation, and mounted on the intermediate mount plate, said injection motor having a rotor fitted co-axially with the second rotating shaft.

An injection apparatus for a motor-driven injection molding machine having a barrel unit configured to heat and plasticate polymer material, and a motor-driven screw disposed in the barrel unit rotatably and movably in the axial direction, said apparatus comprising;

• a first rotating shaft having one end connected to a rear end of the screw;
• a second rotating shaft having a threaded rod portion;
• an injection carriage having a front plate for mounting the barrel unit thereon, and a rear plate for supporting the second rotating shaft at the rear end thereof;
• an injection motor for driving the second rotating shaft for rotation, and mounted on the rear plate of the injection carriage;
• an intermediate mount plate disposed movably between the front plate and the rear plate;
• a charging motor for driving the first rotating shaft for rotation, and mounted on the intermediate mount plate;
• a threaded nut member fixed on the intermediate mount plate and engaging with the threaded rod portion of the second rotating shaft with a predetermined distance spaced apart coaxially between the rear end of the first rotating shaft and the front end of the second rotating shaft;
• and
• a load cell configured to measure thrust force exerting to the intermediate mounting plate, said load cell being disposed between the front end of the second rotating shaft and the intermediate mounting plate.