| 摘要 |
An improved apparatus for hardening elongated workpieces of the type having a pair of indexable spiders with centers for holding the workpieces as they are successively indexed through consecutive treating stations, a slotted plate which is mounted for rotation with the workpieces, a roller which moves on a curve generated by a four-bar linkage working in the slots, a cam disc rotating as the roller moves and having a cam contour which cooperates with a follower roller on a lifting arm for a heating inductor at one of the stations and means for locking the lifting arm in a position with the inductor withdrawn. The locking means includes a second cam member which also engages the lifting arm and control switches for causing the second cam member to prevent the inductor from returning to its station when no workpiece is being advanced to the inductor station. |
