Abstract: The present invention provides an image forming apparatus with an image forming device, sheet containers, sheet discharge unit for discharging the sheet on which the image was formed onto the stacking tray, convey path for directing the sheet to the image forming device, switching unit for selectively directing the sheet to the discharge unit or the convey path and for directing the sheet from the convey path to the discharge unit, and convey rollers for conveying the sheet along the convey path means toward a direction extending from the switching unit to the image forming device or an opposite direction.

Abstract: An image forming apparatus, in which sheets on which image formation has been effected are once contained in an intermediate tray for second image formation and the sheets contained in the intermediate tray are re-fed to an image forming portion of the image forming apparatus to thereby effect plural times of image formation on a sheet, is characterized by a counting device for counting the sheets contained in the intermediate tray.

Abstract: A control unit for a moving body such as an optical system of a copying machine includes detection means for detecting a moving status of the moving body and control means for controlling the movement of the moving body in accordance with a detection output of the detection means. The control means contains data corresponding to the detection output to control the moving body in accordance with the detection output.