| 摘要 |
<p>The device comprises clutches (30,60) whose engagement/disengagement produces rotation of fan (1) at a prescribed number of revolutions relative to revolutions of movement generating shaft. A cylinder (70) comprises a seat with a baffle (71) for controlling and to form a stop for an actuating element (41), which is movable in axial direction between the at least two different end-of-travel positions (72a,72b).</p> |
