Patent ID: 8626028

Claim:
An image forming apparatus comprising: a driving source; at least one image receptor which is rotatably driven by the driving source and on which a latent image is formed; a power transmission unit which transmits power from the driving source to the image receptor; a developing unit which develops a toner image for the latent image formed on the image receptor; and a transferring unit which transfers the toner image developed on the image receptor onto a printing medium, wherein the power transmission unit includes: an image receptor axial gear formed on the same axis as the image receptor; and a plurality of intermediate gears which transmits the power from the driving source to the image receptor axial gear, wherein a number Tn of teeth of one of the plurality of intermediate gears located at an n-th position away from the image receptor axial gear satisfies the following Inequality 1: ( I/Rn )−0.2 ≦Tn ≦( I/Rn )+0.2 where Rn is a reduction ratio from the one of the plurality of intermediate gears located at the n-th position to the image receptor axial gear, and I and n are natural numbers, wherein the number Tn is set to be substantially an integer multiple of the reduction ratio and is a natural number.