Sheet thickness sensing technique and recording head automatic adjusting technique of ink jet recording apparatus using same

摘要

A sheet thickness sensing apparatus of an image recording apparatus includes a thickness sensing circuit for generating a sheet thickness value corresponding to a reflective optical quantity sensed by a reflective optical sensor which is separately installed opposite to a reflective surface moving correspondingly according to the thickness of a fed sheet. A head driving enable time or a head gap is adjusted correspondingly to the thickness of the sheet.