| 摘要 |
<p>A Geneva motion controller for operating a machine in forward and reversed indexed increments on demand includes a Geneva wheel which is rotatable with and slidable on the controller output shaft, two cam units which are rotatable on axes which are parallel to and located on opposite sides of the output shaft axis, each cam unit including three axially spaced formation arrangements with the central formation of both cam units being adapted to lock the Geneva wheel against rotation while enabling continued rotation of the cam units with the upper formation arrangement of the first of the cam units including a downwardly directed Geneva wheel engaging formation and the lower formation arrangement of the second cam unit an upwardly projecting formation, and a cammed trigger unit for moving the Geneva wheel into contact with any of the three cam unit formation arrangements.</p> |
