Pneumatic finger, also known as pneumatic gripper or pneumatic gripper, is the use of compressed air as a power, used to clip or grasp the work piece of the actuator. Originally originated in Japan, it was widely used by domestic automation enterprises.The cylinder diameter can be divided into 16mm, 20mm, 25mm,32mm and 40MM. Its main function is to replace human grasping work, which can effectively improve production efficiency and work safety.SMC pneumatic finger series is one of the most commonly used pneumatic clamping device in the industrial field. Pneumatic finger, also known as finger cylinder, is a professional fixture in the pneumatic industry, according to its functional characteristics can be divided into four categories. 1. Parallel gripper The fingers of the parallel gripper move through two pistons.Each piston consists of a roller and a double crank connected to a pneumatic finger to form a special drive unit.In this way, the pneumatic finger always moves towards the center, and each finger cannot move independently.If the finger moves in the opposite direction, the piston under previous pressure is in the exhaust state and the other piston under pressure. Parallel gripper is driven by a single piston, the shaft drives the crank, and there is a corresponding crank slot on each claw.To reduce friction resistance, the claw plate is connected with the body as a steel ball slide rail structure. 2. Swinging gripper (Y-shaped gripper) There is a ring groove on the piston rod of its swinging gripper. Since the finger trunnion is connected with the ring groove, the finger can move at the same time and align itself automatically, and ensure that the grasping moment is always constant. 3. Rotating jaw The action of rotating the gripper works according to the meshing principle of the rack.The piston is fixed to a shaft that moves up and down.The end of the shaft has three rings slotted, these slots engage with the two drive wheels.Thus, pneumatic fingers can move at the same time and align automatically, and the pinion and rack principle ensures that the grasping force is always constant. 4. Three point claw Each crank is connected to a pneumatic finger. The motion of the piston can drive the motion of three cranks, so that the three fingers can be opened and closed at the same time.