Image forming apparatus having intermediate transfer member

An image forming apparatus which forms a toner image on a sheet, comprising:

• (a) a plurality of exposure sections each which imagewise exposes based on image data;
• (b) a plurality of photoreceptors each for forming an electrostatic latent image by the imagewise exposure of the exposure section;
• (c) an intermediate transfer member, onto which respective color toner images formed on the plurality of photoreceptors are transferred;
• (d) a primary transfer section which executes a first transfer by superimposing respective color toner images formed on the plurality of photoreceptors onto the intermediate transfer member;
• (e) a secondary transfer section including a transfer roller in contact with the intermediate transfer member, which concurrently transfers a plurality of toner images superimposed and formed on the intermediate transfer member onto a sheet conveyed from a sheet feed tray, the secondary transfer section and a high voltage power source which applies voltage to the transfer roller;
• (f) a sheet feed tray including a sheet sensor which detects sheet exhaustion;
• and
• (g) a controller which judges whether there is residual toner, which is a toner image formed onto the intermediate transfer member but not transferred onto the sheet when the sheet sensor detects the sheet exhaustion, and executes a cleaning mode in which the transfer roller is cleaned when there is the residual toner.