SCANNING APPARATUS FOR MEASURING GLASS TEMPERATURES

摘要

An apparatus for traversing a pyrometer across the top surface of a ribbon of glass to observe its temperature profile as it is conveyed through an annealing lehr and wherein the roof of the lehr is provided with a transversely elongated, vertically extending labyrinth passageway opening into the interior of the lehr. The pyrometer, positioned within the passageway with its scanning head substantially flush with the ceiling of the lehr, is mounted for movement in a rectilinear path along the elongation of the passageway by a carriage movably mounted for reciprocation externally of and along the top opening of the passageway. A flexible closure disposed within and extending along the elongation of the passageway together with the labyrinth path thereof effectively seals the interior of the lehr from the outside atmosphere, but yet permits transverse movement of the pyrometer with the passageway.