Optical light beam device for automatically controlling the bending operation when bending with a press brake

摘要

An optical light beam device for automatically controlling the bending operation when bending with a press brake, comprising an emitter (1), mounted on one side of the press, adapted to produce a large-diameter light beam (8), directed parallel to the bending axis of the workpiece to be bent, and a receiver (4) comprising a box (11) including a screen (14) drilled with a plurality of holes (15) arranged to forming a plurality of light beams (16) of small diameters. The box (11) comprises a deflecting means (17) intended to deflecting the light beams (16) on to a system of photodiodes (18) arranged on the axis of rotation (19) of a rotating motor (12) fast with the box (11) and with an angle coder (13). A microordinator is connected to the photodiodes (18) and to the angle coder (13) and permits the determination of the instantaneous bending angle of the workpiece and the control of the descent of the punch.