The present invention relates to a photo-sensitive drum assembly for use in an
ink-jet printer or a laser printer.
According to the present invention, there is provided a photo-sensitive
drum assembly capable of preventing a helical gear from interrupting a first spur
gear while engages with a second spur gear, by placing a gap between the helical
gear and the first spur gear, in case that the helical gear which accept the rotational
driving force and the first spur gear which transmits the rotational driving force
are positioned on a common axis.