An end-effector, specifically a gripper, is the device mounted at the end of a robotic manipulator arm that enables physical interaction with the work environment. It serves as the 'hand' of the robot, responsible for the final task of picking, placing, holding, or manipulating objects. Its design and capabilities directly determine the robot's application in tasks such as assembly, packaging, machine tending, and material handling. The gripper typically consists of fingers or jaws, an actuation mechanism, and a mounting interface. The actuation can be pneumatic, hydraulic, or electric, and the motion is transmitted through a linkage system to open or close the fingers. The gripping force, stroke, and repeatability are critical parameters that must match the specific application requirements. The gripper may include sensors for force or position feedback, and its materials are chosen based on the environment and the objects handled. For instance, aluminum alloy and steel are common for industrial use, while stainless steel is preferred for food or pharmaceutical applications. The operating pressure, gripping force, stroke per jaw, repeatability, operating temperature, supply voltage, IP rating, weight, and material are key specifications that need to be verified with the manufacturer for the actual model. Standards such as ISO 9283, IEC 60529, ASTM B221, and AISI 304 are referenced for testing and material specifications, but they do not imply certification or compliance. Always confirm model-specific values and standards with the legal manufacturer or supplier before procurement.
The gripper operates by converting an input signal (typically pneumatic, hydraulic, or electric) into a mechanical motion to open or close its fingers or jaws. This motion applies a controlled force to securely grasp an object. The actuation mechanism (e.g., pneumatic cylinder, electric motor, or servo) drives a linkage system that translates linear or rotary motion into the gripping action. Sensors may provide feedback on grip force or position.
