| 摘要 |
<p>The drive has a shaft (26), driven by a power source, a first friction disc (89), non-turnably connected to the shaft, and a friction wheel (38) with drive part. A second friction disc is fitted to the driven shaft, at a distance to the first disc. The friction wheel is pivoted between three positions. In a first position, the wheel engages on the first disc, and is driven in a first direction of rotation. In a second position, it engages on the second disc, and is driven in an opposite direction. In a third position, the wheel is at a distance to both friction disc, and is not driven.</p> |
