Image forming apparatus with drive transmission means

摘要

A common driving source (21) transmits a drive force to a driving unit that drives a feeding unit (14) and a conveying unit (15). The driving source (21) is a motor that rotates in either of a normal direction and a reverse direction. The feeding unit (14) includes a mechanical drive-blocking mechanism in its driving sequence. The conveying unit (15) includes a two-system driving sequence and a mechanical drive-blocking mechanism in the driving sequence so as to rotate in one direction regardless of a rotating direction of the driving source (21). A reduction ratio of each driving sequence in the conveying unit (15) is identical.