Patent ID: 8862031
Filing Date: 2014-10-14
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a rotation driving source; a black developing unit comprising a black developing roller configured to carry a black developing agent; a color developing unit comprising a color developing roller configured to carry a color developing agent; a first gear configured to drive the black developing roller to rotate; a second gear configured to drive the color developing roller to rotate; a development drive transmission mechanism configured to transmit rotation driving force of a predetermined direction from the rotation driving source to the first gear and to the second gear; and a switching mechanism configured to switch modes between a first mode in which the rotation driving force is transmitted to the first gear and to the second gear, a second mode in which the rotation driving force is transmitted to the first gear but not transmitted to the second gear, and a third mode in which the rotation driving force is not transmitted to either the first gear or the second gear, wherein: