device for preventing collisions in numerically controlled machine tools

摘要

The present invention provides an interference preventing apparatus which performs an interference checking operation for plural interfering relationships between a movable member and a structural member. The interference preventing apparatus (1) comprises: an interference area defining section (51) for defining an interference area where the movable member is likely to interfere with the structural member; an interference area data storage section (52) for storing therein data of the defined interference area; and an interference checking section (2) which performs the interference checking operation for any of the interfering relationships on the basis of the interference area data and target movement position data of the movable member and, if a possibility of the interference is confirmed, outputs an interference confirming signal to the numerical controller. The interference checking section (2) performs the interference checking operation only for an interfering relationship selected out of the plural interfering relationships by an external input. IMAGE