In order to suppress uneven densities in an image, an image forming apparatus
includes an image bearing member; a first developing unit, including a first developer
carrying member, for developing a first latent image formed on the image bearing
member; a second developing unit, including a second developer carrying member,
for developing a second latent image formed on the image bearing member after the
first developing unit has developed the first latent image; and a rotary unit,
for holding the first and the second developing units and for moving the first
and the second developing unit to positions opposite said image bearing member.
Upon the reception of an image forming signal at the image forming apparatus, the
first and the second developer carrying members are rotated before the first latent
image on the image bearing member is developed.