In PCB manufacturing, the products flow on a conveyor belt and is inspected and determined by the CCD. If the inspection is okay, the conveyor belt continues to transport the product to the next station. However, if the inspection shows NG, the rejected product is pushed to the defective area using a pneumatic cylinder. Usually, the speed of the pneumatic cylinder is unstable and slow (4.5 sec.), leading the conveyor belt to slow down, reducing speed of production.