Sheet thickness sensing apparatus

摘要

A sheet thickness sensing apparatus of an image recording apparatus is described. The apparatus includes a feed roller 114 for conveying a fed sheet, a movable friction roller guide 136 having a reflective surface 138 and a friction roller 128 carried by the friction roller guide 136, the friction roller guide 136 being biased in such a way as to push the friction roller 128 against the feed roller 114. A thickness sensing circuit has an optical sensor 140 positioned to detect reflections from the reflective surface 138 and to produce a sheet thickness value derived from a property of the detected reflections. <IMAGE>