| 摘要 |
An improved pull-back chuck is disclosed that detects when a workpiece is properly located against a locating surface of the chuck and when the workpiece is gripped with sufficient force by the jaws. A transducer is disposed within a master jaw in a portion deformable by operating levers of the chuck assembly. When sufficient force is applied to the workpiece by action of the operating levers, a portion of the master jaw deforms causing the transducer to deform and modify an electrical signal in proportion to the pressure. A switch located in an aperture of a locating plate has an actuator that protrudes beyond the locating surface of the locating plate. When a reference surface of the workpiece abuts the locating surface of the locating plate of the chuck, the actuator is depressed by the workpiece and the switch changes electrical condition giving an indication of abutment. |
