There is provided an image forming apparatus comprising: a readout sensor for reading out an original which is illuminated by a light source; a converter for converting image information which is read out by the readout sensor to a binary signal; printing heads for recording the image information on a recording paper in response to an output of the converter; and a driver for relatively carrying the readout sensor with regard to the original or recording paper. A plurality of sets of those readout sensors, converters and printing heads are arranged in a line on the same substrate. An amount of scan movement of this apparatus is detected and the driving operations of the light source and the image readout sensor or printing head are synchronized for every unit moving amount, so that occurrence of variation in concentration of the reproduced image and a risk of fire can be prevented. Also, a remarkable energy saving effect can be obtained in case of driving the apparatus by a battery.