| 摘要 |
<p>1. A safety device of the intangible barrier type for a press brake or a similar machine, including a light beam (7) emitted by a source (8) and received by a receiver (9) and directed horizontally in the vicinity of the vertical plane (6) described by the motion of the edge of the punch, at the place of the dangerous zone which is constituted by the gap of variable height situated between the edge (5) of the punch and the upper surface (4) of the piece (3) to be folded, the position of the light beam, being fixed at a vertical distance (d) from the upper surface (4) of the piece to be folded, which lies between the thickness of a human finger and the stopping-distance of the punch, characterized in that it includes a device for checking the speed of the punch, arranged so as to order interruption of the motion of the punch when the measured speed is higher than a predetermined speed.</p> |
