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US 2009/0022838 A1Published application
Injection molding machine
AssigneeFanuc Corporation
InventorsJunpei MARUYAMA, Satoshi TAKATSUGI
Life of this patent
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Abstract
When a screw equipped with a check ring is moved forward, torque acting on the screw is detected, and whether the check ring is closed is determined on the basis of the detected torque. The screw is rotated in reverse when the check ring is determined not to be closed, and the reverse rotation of the screw is stopped when the check ring is determined to be closed. The reverse rotation of the screw is thereby controlled so that the screw is rotated in reverse by an optimal amount for reliably closing the check ring.
Claims10
An injection molding machine comprising:
- a screw equipped with a check ring;
- torque detecting means for detecting torque acting on the screw during forward movement of the screw;
- check ring closure state determining means for determining whether the check ring is closed or not on the basis of the torque detected by said torque detecting means;
- and
- screw reverse rotation control means for controlling reverse rotation of the screw on the basis of the determination by said check ring closure state determining means.
2 more elements
Dependencies are inferred from the claim text.