Processing machine with abnormal-load detecting function

摘要

The present invention provides a processing machine having the function of sensitively detect collisions or other abnormalities to prevent the machine from being operated under abnormal conditions. Means 22 is provided for detecting a load on a drive source 1 for driving a movable member 2. Abnormality determining means 23 is provided for determining the load is abnormal if the load as detected by the abnormality means 22 exceeds an abnormality determination level (Lb). The abnormality determining means 23 sets the abnormality determination level (Lb) on the basis of the load as measured during the preceding driving operation of the movable member 2 or the average of loads as measured during several past driving operations that are temporally close to the current one (Fig. 1A).