Optical safety device for press brake, press brake, and optical monitoring method

摘要

The press brake is equipped with an optical safety device to sufficiently secure the safety of bending work, and the processing efficiency of the press brake is increased. A determination unit is configured to detect a shadow of an upper mold caused by a laser beam B projected on a light receiver based on a light receiving state of a photodiode located near the upper mold. It is determined whether or not the image has been expanded to the photodiode 564. When it is determined that the shadow of the upper mold 12 has expanded to the photodiode 564 located closest to the upper mold 12, the invalidating unit 72 invalidates the photodiode 564. The detecting unit 74 detects the presence or absence of foreign matter between the upper mold 12 and the lower mold 14 based on the light receiving states of the plurality of effective photodiodes 56 during the lowering operation of the upper table 26. [Selection] Figure 1