Heizungsvorrichtung

A heating apparatus, which forms an image by heating a sheet-form material carrying image data thereon, comprises a winding means, at least a pair thereof being provided at positions corresponding to both transverse direction ends of the sheet-form material. At least one of the pair of the winding means is movable along the transverse direction of the sheet-form material. The winding means contacts the sheet-form material such that the sheet-form material is wound around along the pair of winding means, thereby curving the sheet-form material in a circular arc shape in a state in which an inner circumferential surface of the winding means is open. Heating means of the heating apparatus is provided at an axial center portion of the sheet-form material, which is wound around along the pair of winding means, along the transverse direction of the sheet-form material, and the heating means directly heats the sheet-form material so that the temperature becomes a value suitable for heat developing processing.