| 摘要 |
A safety device comprises a laser beam (7) emitted by an emitter located at one side of a press and received by a receiver located at the other side of the press. The beam is directed in parallel with the edge (5) of the punch of the press (1) at a distance from the surface (4) of the metal sheet lying between the thickness of a finger and the stopping distance of the punch at low speed. A device disposed in the diameter of the beam enables actual measurement of the speed of motion of the punch or of any body being carried along by the punch, so as to order interruption of the motion of the punch when the measured speed is higher than a predetermined speed.
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