| 摘要 |
<p>A driving device has two rotary bodies rotatable from a common drive body. The drive of one of the bodies is achieved by means of a friction coupling, and the other body only rotates after a certain rotation of the first. Two ramps a roller body partly driven by them which is also arranged in a groove cross ways in front of the ramp. The one ramp is arranged in the first rotary body and the corresponding groove, and the other ramp is in the drive body and the appropriate groove in the other rotary body.</p> |
