Thermal printer with reduced print medium conveyance load

A receipt printer, comprising:

• a platen having a rotatable columnar shape and configured to convey a receipt roll paper having various widths, with a central portion in a direction of a rotary shaft as a reference, in a manner of being in contact with an outer peripheral portion;
• and
• a thermal print head oppositely disposed along the platen, pressed by the outer peripheral portion of the platen, and that is configured to perform printing by applying heat to the receipt roll paper, wherein
• the platen comprises a shaft constituting the rotary shaft and a rubber including the outer peripheral portion provided on an outer periphery of the shaft, and has a first region centered on the central portion and second regions on both outer sides in the direction of the rotary shaft with respect to the first region, and
• a diameter of the platen in the first region and diameters of the platen in the second regions are the same, and a thickness of the rubber in the first region is smaller than a thicknesses of the rubber in the second regions,
• wherein the first region has a length substantially coinciding with the width of the receipt roll paper having a shortest width to be conveyed.

A label printer, comprising:

• a platen having a rotatable columnar shape and configured to convey a roll label paper having various widths, with a central portion in a direction of a rotary shaft as a reference, in a manner of being in contact with an outer peripheral portion;
• and
• a thermal print head oppositely disposed along the platen, pressed by the outer peripheral portion of the platen, and that is configured to perform printing by applying heat to the roll label paper, wherein
• the platen comprises a shaft constituting the rotary shaft and a rubber including the outer peripheral portion provided on an outer periphery of the shaft, and has a first region centered on the central portion and second regions on both outer sides in the direction of the rotary shaft with respect to the first region, and
• a diameter of the platen in the first region and diameters of the platen in the second regions are the same, and a thickness of the rubber in the first region is smaller than a thicknesses of the rubber in the second regions,
• wherein the first region has a length substantially coinciding with the width of the roll label paper having a shortest width to be conveyed.