The C type open frame facilitates die-filling and processing of large-sized materials. The casted frame has stable performance. The transverse crank shaft is easy to maintain. Rigid clutch of a simple structure. Press-down type safe to keep the machine from being damaging during overloading. Draper-type brake is easy to be adjusted. Large throat depth, suitable for cold machining of large-sized plates. Simple structure and good commonality lead to convenient maintenance and operation.