System and method for calibrating tool center point of robot

A system for calibrating tool center points of a robot, comprising:

• a first image sensor, comprising a first image central axis;
• a second image sensor, comprising a second image central axis intersecting the first image axis at an intersection point, wherein a field of view of the second image sensor overlaps a field of view of the first image sensor to form an image overlapping area, and the first image central axis and the second image central axis are inside the image overlapping area;
• and
• a controller, configured to control a robot to move a tool center point of a tool thereof from an initial point in the image overlapping area toward the first image central axis, and changes a moving direction of the tool center point so as to move the tool center point toward the second image central axis when the tool center point reaches the first image central axis, and changes the moving direction of the tool center point so as to move the tool center point toward the first image central axis when the tool center point reaches the second image central axis so as to repeatedly move the tool center point within the image overlapping area and between the first image central axis and the second image central axis until the tool center point overlaps the intersection point;
• wherein the controller is configured to record a calibration point including coordinates of joints of the robot when the tool center point overlaps the intersection point, and the controller is configured to move the tool center point and change a posture of the robot and repeat the above steps to generate a plurality of the calibration points in order to calculate a coordinate of the tool center point according to the calibration points.