Electrode inspection apparatus for spot welding

An electrode inspection apparatus for spot welding, the apparatus comprising:

• an inspection apparatus body in which one or more cameras for imaging tips of one or more electrodes for spot welding held to a weld gun are disposed;
• and
• a control unit having a calculation section processing images of the tips of the electrodes captured by the cameras, and a determining section comparing a calculation result in the calculation section with a preset value to determine conditions of the tips of the electrodes, wherein
• the inspection apparatus body includes a measuring reference unit in which a fixing hole for inserting and fixing each of the tips of the electrodes is formed, a mirror obliquely fixed with respect to one of the tips of the electrodes fixed to the fixing hole at a position opposite to a side of the measuring reference unit from which the electrodes are inserted and a part from the fixing hole in a direction in which each of the electrodes is inserted, and a plurality of edge detection light sources illuminating a periphery of the tips of the electrodes from a radial direction with each of the electrodes fixed to the fixing hole,
• each of the cameras is disposed away from the mirror with a distance there between in a direction orthogonal to the direction in which each of the electrodes is inserted into the fixing hole so as to image each of the tips of the electrodes from a direct front thereof, and
• illumination light sources emitting light toward the mirror are disposed around a periphery of the lens of the cameras.