Consider a pneumatic transferring station shown in Figure Q.3, where two cylinders are used to transfer parts from a lower deck to upper deck conveyors. The operation can be described by the following steps: Step 1: Cylinder 1A extends. Step 2: Cylinder 2A extends. Step 3: Cylinder 2A retracts. Step 4: Cylinder 1A retracts. Step 5: Repeat Step 1. The optical proximity sensor is used to detect the presence of parts on cylinder 1A. Meanwhile, the positions of the piston rod of cylinders are monitored by means of limit switches. The process will only start when a part is detected on cylinder 1A. (a) Determine the sequence of movements of the two cylinders for Step 1 to 5. (b) Draw the displacement step diagram of the two cylinders. (4 marks) (6 marks) (c) Sketch a pneumatic circuit of the system if all the cylinders are of double acting cylinders and all the directional control valves are of 4/2 double solenoid valves. (5 marks) (d) Design an electrical circuit diagram to control the transferring process. (10 marks) Cylinder 2A Eject Lift Cylinder 1A Figure Q.3