Plasticizing unit for a moulding machine having at least one plasticizing screw for plasticizing a plasticizable material and injecting it into at least one mould cavity, which at least one plasticizing screw is rotationally and axially movable in relation to a screw axis, wherein at least one filter is provided, which is arranged downstream of the at least one plasticizing screw in a direction of flow of a mass flow of the plasticizable material.

An injection unit for an injection molding machine includes a cylindrical body rotatably supported in a housing interior for rotational coupling with a plasticizing screw. The cylindrical body is fixed to rotate with the plasticizing screw about an injection axis. A gear train in the housing includes a central gear mounted about, and fixed to rotate with, the cylindrical body, the central gear having an uppermost extent vertically above the injection axis and opposed first and second lateral extents on horizontally opposed sides of the injection axis. A rotary drive for powering rotation of the plasticizing screw includes a first motor having a first motor shaft rotatable about a first motor axis, the first motor axis parallel to the injection axis, the first motor axis at a first elevation below the uppermost extent of the central gear, and laterally outboard of the first lateral extent of the central gear.

An injection unit for an injection molding machine includes a cylindrical body rotatably supported in a housing interior for rotational coupling with a plasticizing screw. The cylindrical body is fixed to rotate with the plasticizing screw about an injection axis. A gear train in the housing includes a central gear mounted about, and fixed to rotate with, the cylindrical body, the central gear having an uppermost extent vertically above the injection axis and opposed first and second lateral extents on horizontally opposed sides of the injection axis. A rotary drive for powering rotation of the plasticizing screw includes a first motor having a first motor shaft rotatable about a first motor axis, the first motor axis parallel to the injection axis, the first motor axis at a first elevation below the uppermost extent of the central gear, and laterally outboard of the first lateral extent of the central gear.

An injection apparatus of one embodiment includes a cylinder, a screw provided inside the cylinder, and a drive mechanism configured to rotate the screw, move the screw forward, and move the screw backward. The drive mechanism includes a piston having a piston rod and a rotating body which is arranged around the piston rod and is driven to rotate around a central axis of the piston rod as a rotation axis. A plurality of external teeth extending in the direction of the central axis of the piston rod are provided on the piston rod, and a plurality of internal teeth meshing with the external teeth are provided on the rotating body. Also, the screw is non-rotatably connected to a distal end side of the piston rod.

An injection molding machine includes an injection apparatus configured to perform an injection operation of a material and a mold clamping apparatus configured to mold the material injected from the injection apparatus. Here, the injection apparatus includes a screw, a piston connected to the screw, and a hydraulic apparatus configured to drive the piston in an axial direction. On the other hand, the mold clamping apparatus includes a movable platen to which a first mold can be attached, a fixed platen to which a second mold can be attached, and an electric drive unit configured to move the movable platen in a mold closing direction or a mold opening direction with respect to the fixed platen.

A configuration of oil hydraulic power unit is simplified. In the oil hydraulic power unit, a port B and a port C are communicated to each other. By this, the hydraulic oil supplied to the port B can also be supplied to the port C even in exclusion of the solenoid valve and the flow-rate control valve, and, as a result, the hydraulic oil supplied to the port C contacts a side surface of the piston, and therefore, a backward pressure can be applied to the side surface of the piston. Thus, according to the oil hydraulic power unit, the backward movement of the piston can be achieved even in the exclusion of the solenoid valve and the flow-rate control valve.

An injection apparatus of one embodiment includes a cylinder, a screw, and a drive mechanism configured to drive the screw. The drive mechanism includes a piston having a hollow piston rod, a connection rod having one end side inserted into the piston rod, the connection rod being rotatable with respect to the piston and movable integrally with the piston in a direction of a central axis of the piston rod, and a rotating body which is arranged around the connection rod and is driven to rotate around a central axis of the connection rod as a rotation axis. A plurality of external teeth are provided on the connection rod, and a plurality of internal teeth meshing with the external teeth are provided on the rotating body. Also, the screw is non-rotatably connected to the other end side of the connection rod protruding from the piston rod.

A configuration of oil hydraulic power unit is simplified. In the oil hydraulic power unit, a port B and a port C are communicated to each other. By this, the hydraulic oil supplied to the port B can also be supplied to the port C even in exclusion of the solenoid valve and the flow-rate control valve, and, as a result, the hydraulic oil supplied to the port C contacts a side surface of the piston, and therefore, a backward pressure can be applied to the side surface of the piston. Thus, according to the oil hydraulic power unit, the backward movement of the piston can be achieved even in the exclusion of the solenoid valve and the flow-rate control valve.

An injection apparatus of one embodiment includes a cylinder, a screw, and a drive mechanism configured to drive the screw. The drive mechanism includes a piston having a hollow piston rod, a connection rod having one end side inserted into the piston rod, the connection rod being rotatable with respect to the piston and movable integrally with the piston in a direction of a central axis of the piston rod, and a rotating body which is arranged around the connection rod and is driven to rotate around a central axis of the connection rod as a rotation axis. A plurality of external teeth are provided on the connection rod, and a plurality of internal teeth meshing with the external teeth are provided on the rotating body. Also, the screw is non-rotatably connected to the other end side of the connection rod protruding from the piston rod.

An injection apparatus of one embodiment includes a cylinder, a screw provided inside the cylinder, and a drive mechanism configured to rotate the screw, move the screw forward, and move the screw backward. The drive mechanism includes a piston having a piston rod and a rotating body which is arranged around the piston rod and is driven to rotate around a central axis of the piston rod as a rotation axis. A plurality of external teeth extending in the direction of the central axis of the piston rod are provided on the piston rod, and a plurality of internal teeth meshing with the external teeth are provided on the rotating body. Also, the screw is non-rotatably connected to a distal end side of the piston rod.