Imaging forming apparatus for forming images on both surfaces of recording medium

An image forming apparatus, comprising:

• image forming means for forming images by means of toner on a first surface and a second surface of a recording medium, respectively, on the basis of an image signal;
• fixing means for heating and bonding compressively a toner image formed on the recording medium;
• anti-offset liquid feeding means for feeding anti-offset liquid to said fixing means;
• discrimination means for discriminating, on the basis of the image signal, which image consumes less toner amount for image formation among images forming on the first surface and second surface of the recording medium, respectively;
• and
• feed control means for controlling said anti-offset liquid feeding means for stopping or reducing the feed of the anti-offset liquid to said fixing means when the image to be formed has been discriminated by said discrimination means as an image of less toner amount consumption.

An image forming apparatus, comprising:

• image forming means for forming images by means of toner on a first surface and a second surface of a recording medium, respectively, on the basis of an image signal;
• fixing means for heating and bonding compressively a toner image formed on the recording medium;
• anti-offset liquid feeding means for feeding anti-offset liquid to said fixing means;
• discrimination means for discriminating, on the basis of the image signal, which image consumes less toner amount for image formation among images forming on the first surface and second surface of the recording medium, respectively;
• first control means for controlling said image forming means so as to execute the image formation operation giving priority to the image which has been discriminated by said discrimination means as an image of less toner amount consumption;
• and
• second control means for controlling said anti-offset feeding means for stopping or reducing the feed of anti-offset to said fixing means when the image to be formed has been discriminated by said discrimination means as an image of less toner amount consumption.