Robot controller for controlling robot which supplies and discharges workpiece

A robot controller for controlling a robot which supplies and/or discharges a workpiece to and/or from each of at least one machine tool, the robot controller comprising:

• a data communicating part which obtains data representing an operation state of the machine tool at predetermined timing by communication with the machine tool;
• a motion pattern storing part which stores a plurality of motion patterns of the robot for the machine tool;
• and
• a motion controlling part which
• automatically selects a motion pattern from the plurality of motion patterns stored in the motion pattern storing part when an abnormality occurs in the machine tool or when an operation state of the machine tool satisfies a predefined condition, and
• operates the robot based on the selected motion pattern,
• wherein the selected motion pattern is associated with an operation state of the machine tool when the abnormality occurs in the machine tool or when the operation state of the machine tool satisfies the predefined condition,
• wherein the motion controlling part
• obtains information regarding an accumulated processing time of the machine tool or a number of workpieces processed by the machine tool at predetermined time intervals, and
• operates the robot so as to clean a predetermined section of the machine tool, when the accumulated processing time or the number of processed workpieces reaches a predetermined value.