| 摘要 |
A system is provided for detecting or locating an edge of a workpiece (20) in a processing path. The system includes a reflector (80) which can be positioned at an elevation higher than the workpiece (20) in the processing path. According to one aspect of the invention, the reflector (80) can be mounted in a recess (140) of a clamp (30) which can be moved to engage the workpiece (20). The system also includes a light beam source (74) and reflected light beam sensor (74) located along one side of the processing path. According to another aspect of the invention, the light beam (76) can be directed at an oblique angle through a corner of the processing path to the reflector (80). Interruption of the light beam (78) changes the state of the sensor (74) which indicates the location of the workpiece edge relative to the location of the light beam source (74) along one axis of a mutually orthogonal three-axis coordinate system. It is also proposed to have the light source located behind a double acting actuator having an open position and a closed position. |
