(57) An image forming apparatus capable of minimizing color mis-registration due to runout
of gears is disclosed. The image forming apparatus includes a plurality of photosensitive
bodies 41Y, 41M, 41C, 41K having transfer points to transfer images onto a transfer
object, a driving source to drive at least two photosensitive bodies of the plurality
of photosensitive bodies, and a driving gear train 200, 300, 400, 500 to transmit
driving power from the driving source to the at least two photosensitive bodies. The
driving gear train includes photosensitive body shaft gears respectively connected
to the photosensitive bodies driven by the driving source, and connecting gears to
transmit the driving power to the photosensitive body shaft gears. When any one of
the photosensitive body shaft gears is set to a reference photosensitive body shaft
gear, the number of teeth of the connecting gear, which is disposed at a jth position from the reference photosensitive body shaft gear, is determined so that
a value calculated from the following equation is substantially an integer.
Here, D refers to a diameter of each of the photosensitive bodies, L refers to a distance
between the transfer points of two adjacent photosensitive bodies, and Rj refers to
a speed reduction ratio from the jth connecting gear to the reference photosensitive body shaft gear.
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