Abstract: To prevent wavy swell from causing in sheet in transferring thereof and avoid wrinkle from being produced in later printing steps, there is provided a sheet transfer machine forward from a printing drum and a press roll. The machine is provided with upper and lower guide plates respectively formed with hole portions. Upper and lower rolls are disposed at the hole portions. There are provided hold rollers for pressing sheet coming from between the upper and the lower guide plates to an upper face of the lower guide plate downstream from the upper roll in a direction of transferring print sheet. In printing, swell is prevented from being produced by pressing the print sheet coming from between the two rolls by the hold rollers. When the sheet is sandwiched by the printing drum and the press roll and printed in later steps, wrinkle is not produced in the print sheet.

Abstract: A thermal printer for a portable electronic device such as a receipt issuing machine is capable of increasing an angle at which thermal recording paper is wound on a platen roller while decreasing running load and without generating static electricity. The thermal printer includes a body frame formed from metal, a thermal head disposed on a bottom part of the body frame for printing paper and a platen roller for urging the paper against the thermal head. A paper guide for guiding the paper to a direction in which the paper is wound on the platen roller is integrally formed with the body frame. A bend-raise portion extending in a paper-width direction of the paper and contacting linearly to the paper while feeding is integrally formed at a part of the paper guide where the paper is inserted. The paper guide is formed in such a manner that it comes close to the platen roller with respect to the bottom of the body frame.