| 摘要 |
13 A two-stage lift arm for raising a transfer bar used in a multi-station machining assembly includes a central pivot at which it is mounted for rotation in a vertical plane about a horizontal axis, a-primary lift roller spaced a first distance from the central pivot location, a secondary lift roller spaced a second distance from the central pivot location, the second distance being greater than the first distance, and means for positively rotating the lift arm between a first position in which only the primary lift roller contacts the transfer bar, a second position in which both rollers contact the transfer bar, and a third position in which only the second lift roller contacts the transfer bar.
|
