Patent ID: 7298470
Filing Date: 2007-11-20
Classification: G01N

Abstract:
1. A defect inspection device for metal ring end faces of a Continuously Variable Transmission (CVT) V-belt comprising: at least two belt pulleys; a rotary driving means for rotating said pulleys and a metal ring as an object to be inspected wound around said belt pulleys and for providing circumferential movement to said metal ring; a tension assignment means for providing a predetermined tension to said metal ring while regulating the spacing of said belt pulleys during rotation; a defect inspection section for inspecting a side end face defect on an inspectable surface of said metal ring during circumferential movement; said defect inspection section includes: a light source for illuminating said inspectable surface of an object to be inspected; a first light guiding path for guiding a reflected light from said inspectable surface to a first light detector and a second light guiding path for guiding said reflected light to a second light detector; a difference value calculation means for calculating a difference value between an electrical signal outputted from said first light detector or an electrical signal correlated to the electrical signal outputted from said first light detector and an electrical signal outputted from said second light detector or an electrical signal correlated to the electrical signal outputted from said second light detector; a discrimination means for discriminating the presence of a defect on said inspectable surface and comparing said difference value with a predetermined threshold value; and further comprises: an angle modification means for performing an angle modification operation continuously in a predetermined range relative to said inspectable surface of said first light guiding path and said second light guiding path.