DETECTING SYSTEM FOR SURFACE AND REVERSE SIDE OF OBJECT

PURPOSE:To detect the surface and the reverse side of an object by deciding the surface and the reverse side directions of the object which pass through between electrodes from a value of the capacitance measured by a capacitance measuring part. CONSTITUTION:When a conductive object 1 of a fixed shape passes through on an object carrying chuter 7 and goes into a space inserted and held upward and downward by an electrode (base part) 4 and an electrode (upper part) 3, the capacitance between the electrodes 4, 3 is measured by a capacitance measuring part 5. In this case, in the case when a surface/reverse side specifying part 2 of the object 1 is in the upper part, and in the case when it is in the lower part, the volume of the capacitance space measured between the electrodes 4, 3 becomes small. Therefore, the measured capacitance becomes larger in the case when the surface/reverse side specifying part is in the lower part than in the case when it is in the upper part. Accordingly, by detecting a difference of this capacitance by an object surface/reverse side deciding part 6, the surface and the reverse side of the object 1 which passes through the chuter 7 is decided.