| 摘要 |
PROBLEM TO BE SOLVED: To provide a work device hardly generating a vibration due to a resonance phenomenon and having a plurality of work means. SOLUTION: A speed control means shifting a rotational speed of each work means to a rotational speed deviated by prescribed ratio from a present rotational speed, when the preset rotational speed of a plurality of the work means is placed in the vicinity of a natural resonance rotational speed of a work device, is provided.
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