In an image forming apparatus, a facsimile device includes a non volatile memory in which received image data of facsimile is stored. The distortion correcting step comprises the steps of: providing the image projector with a correction image for using in compensation of the distortion of output image; and determining a peak position movement amount, and also distorting in advance the input image so as to compensate for the distortion. The pulse generator is adapted to generate a pacing signal to provide myocardium pacing. A side column is extended from a top side of the guard fence to cover and support the metal circular casing.