Patent ID: 6842598

Claim:
An image forming apparatus comprising: an image carrier configured to carry a latent image thereon; two developing devices facing said image carrier and each configured to develop a particular latent image formed on said image carrier with a respective developer carrier, said two developing devices being constructed into a single developing unit; and rotating means for causing said developing unit to angularly move about a preselected axis; wherein said rotating means selectively moves said developing unit to one of a position where one of said two developing devices is located at a developing position close to said image carrier while the other developing device is located at a non-developing position spaced from said image carrier, a position where said the one developing device is located at a non-developing position spaced from said image carrier while the other developing device is located at a developing position close to said image carrier, and a position where said two developing devices both are located at the non-developing positions.