Safety device for e.g. die bending press machine, has light emitter producing light rays, with light source having predominantly incoherent radiation, and light receiver with image optics having focus and aperture arranged in focus

摘要

The device has a light receiver (28) coupled with a machine part (14) such that the receiver is held in front of an edge (22) of the part in a working movement and a light emitter (26) produces light rays (30) parallel to the edge. The receiver has an image sensor e.g. complementary MOS image sensor, with pixels to receive an image of the rays, and an evaluation unit (32) produces an output signal (42) based on the image. The emitter has a light source e.g. LED, with a predominantly incoherent radiation, and the receiver has an image optics with a focus and an aperture arranged in the focus.