| 摘要 |
A safety device for press brakes comprises light projectors mounted on the side of a lower beam of the press brake so as to form a plurality of horizontal light beams extending between a punch and a workpiece, light receivers mounted on the side of the lower beam so as to receive said light beams, and detector means mounted between said light receivers and a safety circuit and adapted to be actuated immediately before the interruption of the light beams when the punch interrupts them with the downward movement of a slide, thereby preventing the stopping of the operation of the press brake.
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