Patent ID: 8428494
Filing Date: 2013-04-23
Classification: F16H,G03G,Y10T

Abstract:
1. A driving device to be used in an image forming apparatus, comprising: an input gear; a partly non-toothed gear having a toothed portion engageable with said input gear and having a non-toothed portion; a holding member capable of placing said partly non-toothed gear in a holding state in which the non-toothed portion opposes said input gear and said partly non-toothed gear is not engaged with said input gear and capable of placing said partly non-toothed gear in a released state in which the holding state is released; a cylindrical member rotatable by receiving a rotational force; a driving member for applying the rotational force to said cylindrical member; and an entering portion which is rotatable together with said partly non-toothed gear and which is capable of moving inside of said cylindrical member and capable of receiving the rotational force from said cylindrical member by a frictional force between said entering portion and said cylindrical member.