To stamp the desired shape of metal buttons, it needs a pallet decoiler to uncoil the brass coil material first. The flat type decoiler machine is suitable for thin material in small inner diameter. It can stack four coils in 150mm width, with inverter for variable speed control. Then, a mechanical roller feeder helps the coil material enter into the stamping punch machine. Mechanical roll feeder is perfect for small pitch feeding in the high-speed punching line, it has stable performance and saves cost.