The RS-40S combination machine is a fully automatic production line used for manufacturing small rectangular cans. It adopts cam mechanism to conduct transmission, can conveying and can holding. Smooth and safe operation is guaranteed thanks to continuously adjustable speed and protection device against can jam. The patented design of reset unit enables the expanding process more stable and overcomes the fatigue issue when using spring. The internal and external grooved pulley makes sure the flanging is uniform and fast, thereby ensuring good seaming quality.