| 摘要 |
At least one unbalance-mass which acts on a compressor plate is fixed non-rotatably on a drive shaft. At least one additional weight (7 and 8) is held loosely on the drive shaft (1), secured against displacement. The additional weight (7 and 8) possesses two shoulders (11 and 12) offset by approximately 180 DEG with respect to one another. The shoulders (11 and 12) interact with drivers (13 and 14) of the unbalance-mass (2) for the purpose of co-driving the additional weights (7 and 8). It is thereby achieved that, for an amplitude change, it is sufficient to change the direction of rotation of the drive shaft (1) without it being necessary to take any additional precautions in the region of the unbalance-masses. <IMAGE>
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