be used in combination with a reversal developing method the toner image that is the visualized latent image is transferred by a transfer roller 55 as a transferring apparatus from the peripheral surface of the photosensitive drum 51 onto a recording medium p for example a sheet of recording paper ohp etc which is delivered with a preset timing as for the above described delivery of the recording medium p the leading edge of the recording medium p is detected by a sensor 58 and the timing of the delivery of the recording medium p is set so that as the recording medium p is delivered the leading edge of the portion of the peripheral surface of the photosensitive drum 51 across which a toner image is formed and the portion of the recording medium p which will be the leading edge of the toner image after the transfer of the toner image from the photosensitive drum 51 onto the recording medium p simultaneously arrive at the image transfer station after being delivered with the preset timing to the transfer station the recording medium p is conveyed through the transfer station while remaining pinched between the photosensitive drum 51 and transfer roller 55 and while the recording medium p.