| 摘要 |
A guard device for machines such as bending presses, cutting machines, stamping machines or the like, wherein a first machine part performs operative movements toward a second machine part. A photoelectric detector arrangement is attached to the first machine part by means of a holding means. This photoelectric detector arrangement is a laser photoelectric detector arrangement, and possesses at least one photoelectric detector, whose light beam shines perpendicular to the working movement and in an adjustable secure position is at a secure distance from such machine part toward the other machine part. On interruption of the light beam the operative motion is arrested by means of a locking means. For the photoelectric detector arrangement on the second machine part an abutment arrangement is arranged which is adapted to prevent interruption of the light beam by a workpiece arranged on the second machine part. The holding means has play permitting further movement of the first machine part in relation to the photoelectric detector arrangement after reaching the abutting position. Furthermore the photoelectric detector arrangement is either sa laterally offset that an interruption of the light beam by the first machine part is excluded during such further movement or the photoelectric detector arrangement is arranged on the first machine part in the working path thereof, a switch means, able to be worked on reaching the abutting position, being designed for deactivation of the at least one photoelectric detector. In the case of this guard means it is possible for two photoelectric detectors to remain operative during the entire operative motion and it is unnecessary for the operative means of the first machine part to be retarded in the last section. |
