GRIPPER ARM ASSEMBLY

摘要

An arm assembly (10) for gripping a sheet of material including jaws (32, 34) and a sensor assembly (84) for detecting a change in the thickness of the material gripped between the jaws (32, 34). A sensor (100) is mounted to the side of the arm and a lever (108) is operatively associated with the jaws for pivotal movement towards and away from the sensor (100) in response to a change in the thickness of the material gripped between the jaws (32, 34). In one embodiment, a magnet (116) is mounted to the tip of the lever (108) and the sensor (100) is a Hall-effect sensor which is responsive to a change in the distance between the sensor (100) and the magnet (116).