Patent ID: 11951665
Assignee: SODICK CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A clamping apparatus of an injection molding machine, comprising:
a first driving device, configured to operate a movable platen to which a movable mold is attached and fixed to perfolin a mold opening/closing;
a second driving device, configured to apply a clamping force to the movable platen;
a screw mechanism, configured to convert a rotational power of the first driving device or the second driving device into a linear power, so that the movable platen reciprocates along a mold opening/closing direction;
a power transmission device, configured to transmit a power of the first driving device to the screw mechanism, and switch a transmission of a power from the second driving device to the screw mechanism by contact/separation between a first rotation plate coupled to a screw shaft of the screw mechanism and a second rotation plate disposed facing the first rotation plate in an axis direction of the screw shaft; and
an urging mechanism, configured to:
integrally move the screw shaft and the first rotation plate in a mold closing direction, separate a joining between the first rotation plate and the second rotation plate wherein a gap is formed between the first rotation plate and the second rotation plate, and release a connection of the second driving device at a normal time, and
allow the screw shaft and the first rotation plate to integrally move in a mold opening direction due to a mold reaction force generated between a pair of molds, and bring the connection of the second driving device into a connected state when a mold closing is completed, wherein the gap is eliminated, and the first rotation plate and the second rotation plate are joined.