| 摘要 |
A driving force transmission unit includes on a driving force transmission path a first driving rotary body with a plurality of first contact portions, a first driven rotary body with a plurality of first contact targets, a second driving rotary body with a plurality of second contact portions, and a second driven rotary body with a plurality of second contact targets. Each of the plurality of the first contact portions and each of the plurality of the first contact targets are disposed such that peaks of periodical shock generated as a first connecting portion defined by one of the first contact portions contacting one of the first contact targets changes from one to another do not overlap with peaks of periodical shock generated as a second connecting portion defined by one of the second contact portions contacting one of the second contact targets changes from one to another. |
