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.

 
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