Patent ID: 7310560

Claim:
A numerically controlled drive device comprising a device for detecting operating anomalies intended for detecting accidental collisions, comprising: at least one motor ( 14 ) able to drive a load ( 18 ) along at least one path by way of an assembly of transmission elements (T), first means for measuring position ( 15 ) disposed upstream of at least one of the elements of the said assembly for transmission to the motor ( 14 ) and intended to provide a first value of position (X M ), second means for measuring position ( 16 ) disposed downstream of this element of the assembly for transmission to said load ( 18 ) and intended to provide a second value of position (X R ) corresponding to the position of the load on said path, means for calculation ( 20 ) for establishing at predetermined intervals (h) error signals (d) corresponding to a difference of the first and second values of position, and means for analysis for analyzing these error signals so as to detect accidental collisions, wherein the means for analysis comprise discrimination means devised in such a way as to analyze said error signals (d) obtained in said predetermined intervals as a function of the path (X R ) traversed in a spatial reference frame (d, X R ) with a view to discriminating between errors due to an accidental collision and those due to at least one other cause.