DETECTOR FOR STEEL SHEET NUMBER LIFTED BY LIFTING ELECTROMAGNET

摘要

PURPOSE:To improve the counting precision by receiving a spot which is projected from a laser light source with an optical distance meter and converting the ruggedness due to the outlines of side faces of a steel sheet to a voltage difference and discriminating this voltage difference to count the number of the steel sheet. CONSTITUTION:Simultaneously with the rise of an electromagnet 3 from a stored steel sheet 5, an optical distance meter 6 and a laser light source 7 are driven downward. The reflected light of the spot irradiated from the light source 7 is received by the optical distance meter 6 to generate a voltage corresponding to the distance from the steel sheet 5. According as the light source 7 and the distance meter 6 are driven downward, the distance from the spot is changed in accordance with the shape of end faces of the steel sheet and the distance meter 6 generates a detection waveform in accordance with this change. The detected waveform is sent to a discriminating device 8 and is analyzed there to count the number of the steel sheet.