An injection unit in which an offset load is not applied to a ball screw for moving an injection screw. A pusher plate is provided that is moved while being guided by guide rods extending between front and rear plates, and is mounted with the injection screw and the ball screw so as to be rotatable but axially immovable. The ball screw is threadedly engaged with a nut mounted to the rear plate so as to be unrotatable and axially immovable. A support plate is coupled through coupling rods to the ...

A screw shaft for driving an injection screw driving body in a motor-driven injection device is coupled to a motor shaft of an electric motor in engagement of splines. A spline for the motor shaft engaging with a spline disposed at the outer periphery at a shaft end of the screw shaft is fitted into a recess formed inside of a motor shaft end. A flange formed around the spline is clamped at end face of the motor shaft via a bolt, and is formed at the inner periphery of a bearing sleeve detachabl...

An injection mechanism for an injection molding machine includes a front plate carrying an injection cylinder. A guide rod is arranged fixedly relative to the front plate, and defines a longitudinal guiding axis. A movable plate is arranged movably relative to said front plate along said guiding axis, and carries an injection screw. A support structure is interposed between the guide rod and the movable plate, and movably supports the movable plate on the guide rod along the guiding axis. The su...

An injection unit for a plastic injection molding machine having a screw, having a motion spindle as first drive element, via which the screw can be rotationally driven for the plasticization and is movable in the axial direction for the injection, having a spindle nut as second drive element, which is coupled to the motion spindle via a motion screw thread, having a large electric motor which is arranged so as to be fixed to the frame and by which, while one drive element is held against rotati...

A lightweight, compact, and low-cost two-plate type injection apparatus attached to an injection molding machine which includes an injection screw (50) spline-connected to a screw sleeve which is rotatably supported by a pusher plate (20) movable toward and away from a front plate (10). The screw is coupled through a transmission mechanism (62, 63) to a metering motor (160) which is fixed to the top face of the pusher plate so that the motor body is located above and between the two plates. Firs...

Molding system for filling mold with molding material, comprising: extruder, including: barrel configured to process molding material being pushable from barrel; barrel head operatively attached to barrel; screw disposed in the barrel; and screw drive connected to screw; stationary platen support a stationary mold portion; movable platen configured to be movable relative to the stationary platen; and body overlapping and sealing, at least in part, barrel and barrel head, body including: flange r...

An installation for the treatment and further processing of thermoplastics comprises a screw-type compounding unit, downstream of which is disposed an intermittently drivable processing unit. Provision is made for a control unit which is connected with a drive of the screw-type compounding unit and with the drive of a metering device and with a drive of the processing unit. The control unit is designed for triggering the drives by the cycle time of the processing unit, the drives having identica...

An injection screw and barrel for small injection molding shots employs separate plunger and flight sections so that the plunger section may be arbitrarily reduced in diameter without adversely affecting the threaded portion of the flight section. Melt passes from the flight section to a metering area through a hollow bore in the plunger section.

An object is to provide a drive apparatus for an injection molding machine which can generate a large thrust force and can provide short-cycled continuous drive. The drive apparatus includes a housing (11); a tubular linear motor (14) including a movable element (12) disposed within the housing (11) in a manner capable of advancing and retreating, and a stationary element (13) attached to the housing (11), the linear motor (14) serving as a first drive section; a member-to-be-driven (15) caused ...

An injection apparatus comprises a screw drive shaft, a motor which generates torque to rotate the screw, a speed reducer, and a power transmission mechanism. The power transmission mechanism has a first pulley on an output shaft of the motor, a second pulley on an input shaft of the speed reducer, and a belt passed around the first and second pulleys. The speed reducer is located between the second pulley and the screw drive shaft. The speed reducer is formed of a planetary gear mechanism, and ...