Safety device for a press brake or similar machine
AssigneeCybelec S.A.
InventorJean-Claude Maillefer
Life of this patent
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Abstract
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.
Claims12
In a machine having an edge of a reciprocating punch operating in a danger zone that is formed by a gap of variable dimension between the edge of the punch and a surface of a work piece, the motion of the edge of the punch describing a plane, punch driving means of the machine having a characteristic stopping distance within which the approach of the punch to the work piece may be stopped in response to an unsafe condition, a safety device of the intangible barrier type comprising:
- a light beam source emitting a light beam in a direction substantially transverse of the direction of motion of the punch, the beam being located in the vicinity of said plane and at a predetermined distance from said surface of a work piece, said predetermined distance having a magnitude between the thickness of a human finger and said characteristic stopping distance;
- and
- a receiver responsive to interruption of the light beam caused by motion of the punch,
- the receiver comprising a speed measuring device for measuring the speed of the punch, the punch driving means being responsive to the speed measuring device, the speed measuring device causing interruption of the motion of the punch when the measured speed of the punch is greater than a predetermined speed.
Dependencies are inferred from the claim text.