| 摘要 |
Actuating device comprising a longitudinal shaft ( 2 ), an intermediate tailstock spindle ( 3 ), an outside sleeve ( 4 ), internal thread means ( 5 ) making it possible to connect the longitudinal shaft and the intermediate tailstock spindle to generate an axial movement of one with respect to the other, external thread means ( 6 ) making it possible to couple the intermediate tailstock spindle and the outside sleeve and suitable for generating an axial movement of one with respect to the other, the said internal coupling means comprising internal roller elements ( 7 ) engaged on the one hand with the external and internal threads of the intermediate tailstock spindle and/or the said external coupling means comprising external roller elements ( 25 ) engaged on the one hand with the external thread of the intermediate tailstock spindle and the internal thread of the outside sleeve and comprising coupling means making it possible to couple the shaft and the intermediate tailstock spindle or the intermediate tailstock spindle and the internal thread of the outside sleeve selectively while rotating.
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