Numerically controlled drive device with device for detecting operating anomalies intended for detecting accidental collisions and method of detecting operating anomalies for this device

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 (XM),
• 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 (XR) 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 (XR) traversed in a spatial reference frame (d, XR) with a view to discriminating between errors due to an accidental collision and those due to at least one other cause.