Machine Tool Operation Monitoring System

A machine tool operation monitoring system that detects an abnormal operation in any of a plurality of machine tools which perform cutting work on a material, the system comprising:

• a camera photographing each machine tool,
• a reflecting display plate provided for each machine tool for projecting reflected light as a projection onto the camera to identify the machine tool breaking out an operation abnormality by moving the reflecting display plate provided for each machine tool to a position where the reflecting display plate can reflect illumination light in a plant to produce an image associated with the projection when one of the following occurs:
• a torque of a drive motor exceeds a normal operating range in any of the plurality of machine tools,
• a speed of a drive motor exceeds a normal operating range in any of the plurality of machine tools, or
• moving positions of a constituent portion and of a material in one of reciprocating movement or rotational movement relative to the machine tool operated by the drive motor exceed a predetermined normal operating region range, and
• a monitor for monitoring the image associated with said projection.