| 摘要 |
In a ball screw transfer drive for a transfer machine, first and second carriages are translated by rotation of a ball screw, the ball screw being actuated by a DC electric or other type of variable speed motor through a ball screw drive train. The first carriage is coupled to the ball screw through a first ball nut which is immovably joined to the first carriage and which has threads in engaging relationship with threads of the ball screw. The second carriage is coupled to the ball screw through a second ball nut which is journaled in bearings attached to the second carriage, threads of the second ball nut likewise being in engaging relationship with the ball screw. A power transmission train is mounted between the ball screw and the second ball nut to rotate the second ball nut during a specified rotation of the ball screw to maintain a pre-specified relationship between the speeds of translation of the first and second carriages during the specified ball screw rotation. During the specified rotation, the first and second carriages, respectively, drive first and second workpiece transfer devices mounted in the transfer machine.
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