Line-type thermal printing apparatus for printing on a sheet having different thicknesses

Abstract

A line-type thermal printing apparatus includes a thermal head for recording on a sheet whose thickness is even in the feeding direction thereof and uneven in the print line direction. The apparatus also includes a platen having a platen body portion that rotates integrally with a platen shaft and that feeds the sheet by pinching a part of the sheet between the thermal head and the platen body portion, and separate platen portion that face other parts of the sheet which have thicknesses different from that of the part of the sheet pinched between the thermal head and the platen body portion. The separate platen portions have center holes that are dimensioned to loosely fit the platen shaft. Urging mechanisms are provided for urging the separate platen portions so as to press the other parts of the sheet against the thermal head. For example, a part of a sheet is located opposite to the platen body portion and the other parts of the sheet are located opposite to the separate platen portions. While the part of the sheet is pressed against the platen body portion, the separate platen portions are urged by the urging mechanisms so as to press the other parts of the sheet against the thermal head. The sheet is fed by rotating the platen body portion while recording is sequentially performed by the thermal head.

Dependencies are inferred from the claim text.