| 摘要 |
Axial thread rolling head which comprises a bearing unit including the thread rollers and rotatably supporting said thread rollers by means of eccentric shafts, an axial shank being axially movable with respect to said bearing unit and, in a first axial relative position, cooperating with a claw clutch portion of said bearing unit by means of a claw clutch portion to connect both portions so as to be resistant to torsional strength, a first gear between said shank and said eccentric shafts, a helical spring between said shank and said bearing unit being so provided that in a second axial relative position, in which said claw clutch portions are out of mesh, said helical spring, on the occasion of a displacement of said bearing unit into a first direction of rotation with respect to said shank, is tensioned or, respectively, said tensioned helical spring displaces said bearing unit into the second direction of rotation relative to said shank, spring means which tension said shank and said bearing unit into the first relative position towards each other, and mechanical switching means which, when getting into touch with a workpiece, cause said shank and said bearing unit to move into the second relative position, a power operated drive being arranged on said shank and connected to said bearing unit (LE) via a second gear for displacing said bearing unit into the first direction of rotation by a preset angle of rotation, with said shank and said bearing unit (LE) being in the second axial relative position.
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