| 摘要 |
The support (1) has outer retaining elements (5, 7) e.g. angular levers, cooperating with a center piece (8) by inner ends (10). A drive unit (61) is driven by an electric motor (21) such that rotation movements of the electric motor are changed by the drive unit into two different axial feed speeds of the center piece by force amounts aligned on a workpiece (4). A positive effective coupling (62) is used for adjusting the feed speeds of the center piece between the center piece and the motor. The coupling is automatically switched into different switching positions by the drive unit. |
