Injection Unit`s Mechanical Configuration and Movement
・ Operation principle
The AC servomotor for injection turns the ball screw nut and moves the ball screw back and forth to advance or retract the screw.
・ Stroke range
The stroke range of screw advance/retract is fixed by the controller setting. [2] Charge (screw running)
・ Operation principle
Rotation of the AC servomotor for charging (screw running) is transmitted to the screw by way of a timing belt.
・ Stroke range
The stroke range of charging (screw running) is not on the controller setting. [3] Injection unit advance/retract (nozzle touch)
・ Operation principle
The injection unit advances or retracts being driven by a geared motor by way of the ball screw. The brake holds nozzle touch force. Hence the geared motor rotates only when required and consumes no excessive energy.
・ Stroke range
Limit switches are installed on both the advance and retract limits of the injection unit to determine stroke range. On reaching the limit, the injection unit stops advancing or retracting.
