The present invention provides a single-chip printer which uses a simple structure and does not generate failure of generating damage to the surface processing components such as a film, etc. for processing the surface of single piece of paper. A controlling surface (23a) of a paw platform (23A) necessary for forming a cylinder (19) of a processing part (6) is formed to an inclined plane which nears to the side of the axial center of rotation when nearing to the downstream side of the conveying direction of the cylinder (19) in order that a clamper (23) which is provided on the cylinder (19) not contact a processing mechanism of the processing part (6). A controlling surface (17a) of a paw platform (17A) which is provided by a cylinder (18) adjacent with the processing part (6) in a plurality of cylinders (18, 4B, 14) that are configured between the cylinder (19) and a printing pushing cylinder (12A) is formed to an inclined surface which further protrudes from the contour (18S) of the adjacent cylinder (18) when nearing the downstream side of the conveying direction. A controlling surface (15a) of a paw platform (15A) which is provided by on a cylinder (14) that is most near to the position of printing used pushing cylinder (12A) is formed to an inclining angle less than that of the controlling surface (23a) of the paw platform (23A) of the cylinder (19) that is provided by the processing part (6).